Forget talking to plants to help them grow, gently rubbing them with your fingers can make them less susceptible to disease, a paper in the open access journal BMC Plant Biology reveals.
Gently rubbing the leaves of thale cress plants (Arabidsopsis thaliana) between thumb and forefinger activates an innate defense mechanism, Floriane L'Haridon and colleagues report. Within minutes, biochemical changes occur, causing the plant to become more resistant to Botrytis cinerea, the fungus that causes grey mould.
Rubbing the leaves is a form of mechanical stress. Plants frequently have to deal with mechanical stress, be it caused by rain, wind, animals or even other plants. Trees growing on windy shorelines, for example, sometimes respond by developing shorter, thicker trunks.
But plants also respond to more delicate forms of mechanical stress, such as touch. Some responses are obvious -- the snapping shut of a Venus fly trap, the folding leaflets of a touched touch-me-not plant (Mimosa pudica) -- whilst some are more discrete. Plants also launch an arsenal of 'invisible' responses to mechanical stress, including changes at the molecular and biochemical level.
September 13, 2013
Youth more likely to be bullied at schools with anti-bullying programs
Anti-bullying initiatives have become standard at schools across the country, but a new UT Arlington study finds that students attending those schools may be more likely to be a victim of bullying than children at schools without such programs.
The findings run counter to the common perception that bullying prevention programs can help protect kids from repeated harassment or physical and emotional attacks.
"One possible reason for this is that the students who are victimizing their peers have learned the language from these anti-bullying campaigns and programs," said Seokjin Jeong, an assistant professor of criminology and criminal justice at UT Arlington and lead author of the study, which was published in the Journal of Criminology.
"The schools with interventions say, 'You shouldn't do this,' or 'you shouldn't do that.' But through the programs, the students become highly exposed to what a bully is and they know what to do or say when questioned by parents or teachers," Jeong said.
The findings run counter to the common perception that bullying prevention programs can help protect kids from repeated harassment or physical and emotional attacks.
"One possible reason for this is that the students who are victimizing their peers have learned the language from these anti-bullying campaigns and programs," said Seokjin Jeong, an assistant professor of criminology and criminal justice at UT Arlington and lead author of the study, which was published in the Journal of Criminology.
"The schools with interventions say, 'You shouldn't do this,' or 'you shouldn't do that.' But through the programs, the students become highly exposed to what a bully is and they know what to do or say when questioned by parents or teachers," Jeong said.
September 12, 2013
Everyday sadists take pleasure in others' pain
Most of the time, we try to avoid inflicting pain on others -- when we do hurt someone, we typically experience guilt, remorse, or other feelings of distress. But for some, cruelty can be pleasurable, even exciting. New research suggests that this kind of everyday sadism is real and more common than we might think.
Two studies led by psychological scientist Erin Buckels of the University of British Columbia revealed that people who score high on a measure of sadism seem to derive pleasure from behaviors that hurt others, and are even willing to expend extra effort to make someone else suffer.
The new findings are published in Psychological Science, a journal of the Association for Psychological Science.
"Some find it hard to reconcile sadism with the concept of 'normal' psychological functioning, but our findings show that sadistic tendencies among otherwise well-adjusted people must be acknowledged," says Buckels. "These people aren't necessarily serial killers or sexual deviants but they gain some emotional benefit in causing or simply observing others' suffering."
Two studies led by psychological scientist Erin Buckels of the University of British Columbia revealed that people who score high on a measure of sadism seem to derive pleasure from behaviors that hurt others, and are even willing to expend extra effort to make someone else suffer.
The new findings are published in Psychological Science, a journal of the Association for Psychological Science.
"Some find it hard to reconcile sadism with the concept of 'normal' psychological functioning, but our findings show that sadistic tendencies among otherwise well-adjusted people must be acknowledged," says Buckels. "These people aren't necessarily serial killers or sexual deviants but they gain some emotional benefit in causing or simply observing others' suffering."
August 20, 2013
LSD and other psychedelics not linked with mental health problems, analysis suggests
The use of LSD, magic mushrooms, or peyote does not increase a person's risk of developing mental health problems, according to an analysis of information from more than 130,000 randomly chosen people, including 22,000 people who had used psychedelics at least once.
Researcher Teri Krebs and clinical psychologist Pål-Ørjan Johansen, from the Norwegian University of Science and Technology's (NTNU) Department of Neuroscience, used data from a US national health survey to see what association there was, if any, between psychedelic drug use and mental health problems.
The authors found no link between the use of psychedelic drugs and a range of mental health problems. Instead they found some significant associations between the use of psychedelic drugs and fewer mental health problems.
Researcher Teri Krebs and clinical psychologist Pål-Ørjan Johansen, from the Norwegian University of Science and Technology's (NTNU) Department of Neuroscience, used data from a US national health survey to see what association there was, if any, between psychedelic drug use and mental health problems.
The authors found no link between the use of psychedelic drugs and a range of mental health problems. Instead they found some significant associations between the use of psychedelic drugs and fewer mental health problems.
July 31, 2013
Be happy - your genes will thank you for it: Doing good leads to strong immune cells
American scientists have found different types of happiness have surprisingly contrary effects on our genes.
UCLA research found that people who derive their happiness from helping others have strong antibody genes, while people who get their kicks from self-gratification can suffer from low antiviral and anitbody gene expression.
The study, which also involved the University of North Carolina, is the first of its kind to examine how positive psychology impacts human gene expression.
People who are do-gooders have high levels of 'eudaimonic well-being'.
UCLA research found that people who derive their happiness from helping others have strong antibody genes, while people who get their kicks from self-gratification can suffer from low antiviral and anitbody gene expression.
The study, which also involved the University of North Carolina, is the first of its kind to examine how positive psychology impacts human gene expression.
People who are do-gooders have high levels of 'eudaimonic well-being'.
July 24, 2013
Athletes need to be careful to monitor diet, weight to maintain muscle mass
Athletes seeking a healthy performance weight should eat high fiber, low-fat food balanced with their training regimen in order to maintain muscle while still burning fat, according to a report by an Oregon State University researcher.
The United States now has a record number of overweight athletes, a population many think of as untouched by the obesity crisis. Nationally, more than 45 percent of high school linebackers are obese, and the number of overweight students entering college level-sports is increasing.
The United States now has a record number of overweight athletes, a population many think of as untouched by the obesity crisis. Nationally, more than 45 percent of high school linebackers are obese, and the number of overweight students entering college level-sports is increasing.
US physicians put patients' best interests above concerns about health care costs
A new study of attitudes about health care costs reveals that an overwhelming majority of U.S. physicians feel a responsibility to address costs, but prioritize their obligations to patients' best interests over cost concerns. Results of the random survey of 2,500 U.S. physicians are published in this week's Journal of the American Medical Association (JAMA).
"Physicians feel stuck in a difficult position," says lead author Jon Tilburt, M.D., Mayo Clinic's Biomedical Ethics Program and Center for the Science of Health Care Delivery. "Despite their sense of responsibility to address health care costs, physicians consistently express a commitment to the best interests of patients even when it is expensive. Given this finding, we recommend that cost-containment strategies aimed at physician behavior should focus on innovations that not only promote savings but also preserve physicians' commitment to individual patients."
"Physicians feel stuck in a difficult position," says lead author Jon Tilburt, M.D., Mayo Clinic's Biomedical Ethics Program and Center for the Science of Health Care Delivery. "Despite their sense of responsibility to address health care costs, physicians consistently express a commitment to the best interests of patients even when it is expensive. Given this finding, we recommend that cost-containment strategies aimed at physician behavior should focus on innovations that not only promote savings but also preserve physicians' commitment to individual patients."
July 23, 2013
'Love hormone' is two-faced: Oxytocin strengthens bad memories and can increase fear and anxiety
It turns out the love hormone oxytocin is two-faced. Oxytocin has long been known as the warm, fuzzy hormone that promotes feelings of love, social bonding and well-being. It's even being tested as an anti-anxiety drug. But new Northwestern Medicine® research shows oxytocin also can cause emotional pain, an entirely new, darker identity for the hormone.
Oxytocin appears to be the reason stressful social situations, perhaps being bullied at school or tormented by a boss, reverberate long past the event and can trigger fear and anxiety in the future.
That's because the hormone actually strengthens social memory in one specific region of the brain, Northwestern scientists discovered.
If a social experience is negative or stressful, the hormone activates a part of the brain that intensifies the memory. Oxytocin also increases the susceptibility to feeling fearful and anxious during stressful events going forward.
Oxytocin appears to be the reason stressful social situations, perhaps being bullied at school or tormented by a boss, reverberate long past the event and can trigger fear and anxiety in the future.
That's because the hormone actually strengthens social memory in one specific region of the brain, Northwestern scientists discovered.
If a social experience is negative or stressful, the hormone activates a part of the brain that intensifies the memory. Oxytocin also increases the susceptibility to feeling fearful and anxious during stressful events going forward.
Microchips that mimic the brain: Novel microchips imitate the brain's information processing in real time
Novel microchips imitate the brain's information processing in real time. Neuroinformatics researchers from the University of Zurich and ETH Zurich together with colleagues from the EU and US demonstrate how complex cognitive abilities can be incorporated into electronic systems made with so-called neuromorphic chips: They show how to assemble and configure these electronic systems to function in a way similar to an actual brain.
No computer works as efficiently as the human brain -- so much so that building an artificial brain is the goal of many scientists. Neuroinformatics researchers from the University of Zurich and ETH Zurich have now made a breakthrough in this direction by understanding how to configure so-called neuromorphic chips to imitate the brain's information processing abilities in real-time. They demonstrated this by building an artificial sensory processing system that exhibits cognitive abilities.
Most approaches in neuroinformatics are limited to the development of neural network models on conventional computers or aim to simulate complex nerve networks on supercomputers. Few pursue the Zurich researchers' approach to develop electronic circuits that are comparable to a real brain in terms of size, speed, and energy consumption. "Our goal is to emulate the properties of biological neurons and synapses directly on microchips," explains Giacomo Indiveri, a professor at the Institute of Neuroinformatics (INI), of the University of Zurich and ETH Zurich.
No computer works as efficiently as the human brain -- so much so that building an artificial brain is the goal of many scientists. Neuroinformatics researchers from the University of Zurich and ETH Zurich have now made a breakthrough in this direction by understanding how to configure so-called neuromorphic chips to imitate the brain's information processing abilities in real-time. They demonstrated this by building an artificial sensory processing system that exhibits cognitive abilities.
Most approaches in neuroinformatics are limited to the development of neural network models on conventional computers or aim to simulate complex nerve networks on supercomputers. Few pursue the Zurich researchers' approach to develop electronic circuits that are comparable to a real brain in terms of size, speed, and energy consumption. "Our goal is to emulate the properties of biological neurons and synapses directly on microchips," explains Giacomo Indiveri, a professor at the Institute of Neuroinformatics (INI), of the University of Zurich and ETH Zurich.
Skipping breakfast may increase coronary heart disease risk
A large 16-year study finds men who reported that they skipped breakfast had higher risk of heart attack or death from coronary heart disease. The timing of meals, whether it's missing a meal in the morning or eating a meal very late at night, may cause adverse metabolic effects that lead to coronary heart disease. Even after accounting for modest differences in diet, physical activity, smoking and other lifestyle factors, the association between skipping breakfast (or eating very late at night) and coronary heart disease persisted.
Here's more evidence why breakfast may be the most important meal of the day: Men who reported that they regularly skipped breakfast had a higher risk of a heart attack or fatal coronary heart disease in a study reported in the American Heart Association journal Circulation.
Researchers analyzed food frequency questionnaire data and tracked health outcomes for 16 years (1992-2008) on 26,902 male health professionals ages 45-82. They found:
-Men who reported they skipped breakfast had a 27 percent higher risk of heart attack or death from coronary heart disease than those who reported they didn't.
-The men who reported not eating breakfast were younger than those who did, and were more likely to be smokers, employed full time, unmarried, less physically active and drank more alcohol.
-Men who reported eating late at night (eating after going to bed) had a 55 percent higher coronary heart disease risk than those who didn't. But researchers were less convinced this was a major public health concern because few men in the study reported this behavior.
-During the study, 1,572 of the men had first-time cardiac events.
Here's more evidence why breakfast may be the most important meal of the day: Men who reported that they regularly skipped breakfast had a higher risk of a heart attack or fatal coronary heart disease in a study reported in the American Heart Association journal Circulation.
Researchers analyzed food frequency questionnaire data and tracked health outcomes for 16 years (1992-2008) on 26,902 male health professionals ages 45-82. They found:
-Men who reported they skipped breakfast had a 27 percent higher risk of heart attack or death from coronary heart disease than those who reported they didn't.
-The men who reported not eating breakfast were younger than those who did, and were more likely to be smokers, employed full time, unmarried, less physically active and drank more alcohol.
-Men who reported eating late at night (eating after going to bed) had a 55 percent higher coronary heart disease risk than those who didn't. But researchers were less convinced this was a major public health concern because few men in the study reported this behavior.
-During the study, 1,572 of the men had first-time cardiac events.
July 19, 2013
Facebook for molecules
Social media has expanded to reach an unlikely new target: molecules. Scientists at the National Institute of Standards and Technology (NIST) have created networks of molecular data similar to Facebook's recently debuted graph search feature. While graph search would allow Facebook users to find all their New York-living, beer-drinking buddies in one quick search, the NIST-designed networks could help scientists rapidly sift through enormous chemical and biological data sets to find substances with specific properties, for example all 5-ring chemicals with an affinity for enzyme A. The search approach could help speed up the development of new drugs and designer materials.
The NIST team will present their research at the upcoming American Crystallographic Association Meeting, held July 20-24 in Honolulu.
Choosing the Right Words
Molecules don't maintain their own online profiles, so a key challenge for the NIST research team was to develop a standard language for scientists to describe their research subjects. For example, one research group may describe a material's properties as glassy while another team might use the word vitreous, even though the two words have the same meaning, explained Ursula Kattner, a researcher in the Materials Science and Engineering Division at NIST.
The NIST team will present their research at the upcoming American Crystallographic Association Meeting, held July 20-24 in Honolulu.
Choosing the Right Words
Molecules don't maintain their own online profiles, so a key challenge for the NIST research team was to develop a standard language for scientists to describe their research subjects. For example, one research group may describe a material's properties as glassy while another team might use the word vitreous, even though the two words have the same meaning, explained Ursula Kattner, a researcher in the Materials Science and Engineering Division at NIST.
July 16, 2013
How cranberries impact infection-causing bacteria
Consuming cranberry products has been anecdotally associated with prevention of urinary tract infections (UTIs) for over 100 years. But is this popular belief a myth, or scientific fact?
In recent years, some studies have suggested that cranberries prevent UTIs by hindering bacteria from sticking to the walls of the urinary tract, thanks to phytochemicals known as proanthocyanidins (PACs). Yet the mechanisms by which cranberry materials may alter bacterial behaviour have not been fully understood.
Now, researchers in McGill University's Department of Chemical Engineering are shedding light on the biological mechanisms by which cranberries may impart protective properties against urinary tract and other infections. Two new studies, spearheaded by Prof. Nathalie Tufenkji, add to evidence of cranberries' effects on UTI-causing bacteria. The findings also point to the potential for cranberry derivatives to be used to prevent bacterial colonization in medical devices such as catheters.
In research results published online last month in the Canadian Journal of Microbiology, Prof. Tufenkji and members of her laboratory report that cranberry powder can inhibit the ability of Proteus mirabilis, a bacterium frequently implicated in complicated UTIs, to swarm on agar plates and swim within the agar. The experiments also show that increasing concentrations of cranberry powder reduce the bacteria's production of urease, an enzyme that contributes to the virulence of infections.
In recent years, some studies have suggested that cranberries prevent UTIs by hindering bacteria from sticking to the walls of the urinary tract, thanks to phytochemicals known as proanthocyanidins (PACs). Yet the mechanisms by which cranberry materials may alter bacterial behaviour have not been fully understood.
Now, researchers in McGill University's Department of Chemical Engineering are shedding light on the biological mechanisms by which cranberries may impart protective properties against urinary tract and other infections. Two new studies, spearheaded by Prof. Nathalie Tufenkji, add to evidence of cranberries' effects on UTI-causing bacteria. The findings also point to the potential for cranberry derivatives to be used to prevent bacterial colonization in medical devices such as catheters.
In research results published online last month in the Canadian Journal of Microbiology, Prof. Tufenkji and members of her laboratory report that cranberry powder can inhibit the ability of Proteus mirabilis, a bacterium frequently implicated in complicated UTIs, to swarm on agar plates and swim within the agar. The experiments also show that increasing concentrations of cranberry powder reduce the bacteria's production of urease, an enzyme that contributes to the virulence of infections.
People who eat nuts more than three times a week have reduced risk of dying from cancer or cardiovascular disease
People who eat nuts, particularly walnuts, are more likely to live longer, finds research in BioMed Central's open access journal BMC Medicine. In a longitudinal study, researchers suggest that those who eat nuts more than three times a week have a reduced risk of dying from cancer or cardiovascular disease than non-nut eaters.
The PREDIMED nutrition trial based in Spain looked at the effect on the primary prevention of cardiovascular disease of over 7000 older people (aged 55 to 90) randomized to a Mediterranean Diet supplemented with extra virgin olive oil or nuts, compared to a control group following a low fat diet. In Mediterranean regions, nut consumption is relatively high compared to other countries. People who ate nuts tended to have a lower BMI and smaller waist. They were also less likely to smoke and were more physically active than those who rarely or never ate nuts. Nut eating was associated with a better diet in general as these people ate more vegetables, fruit and fish.
The PREDIMED nutrition trial based in Spain looked at the effect on the primary prevention of cardiovascular disease of over 7000 older people (aged 55 to 90) randomized to a Mediterranean Diet supplemented with extra virgin olive oil or nuts, compared to a control group following a low fat diet. In Mediterranean regions, nut consumption is relatively high compared to other countries. People who ate nuts tended to have a lower BMI and smaller waist. They were also less likely to smoke and were more physically active than those who rarely or never ate nuts. Nut eating was associated with a better diet in general as these people ate more vegetables, fruit and fish.
July 12, 2013
Air pollution responsible for more than 2 million deaths worldwide each year, experts estimate
More than two million deaths occur worldwide each year as a direct result of human-caused outdoor air pollution, a new study has found.
In addition, while it has been suggested that a changing climate can exacerbate the effects of air pollution and increase death rates, the study shows that this has a minimal effect and only accounts for a small proportion of current deaths related to air pollution.
The study, which has been published today, 12 July, in IOP Publishing's journal Environmental Research Letters, estimates that around 470,000 people die each year because of human-caused increases in ozone.
It also estimates that around 2.1 million deaths are caused each year by human-caused increases in fine particulate matter (PM2.5) ? tiny particles suspended in the air that can penetrate deep into the lungs, causing cancer and other respiratory disease.
In addition, while it has been suggested that a changing climate can exacerbate the effects of air pollution and increase death rates, the study shows that this has a minimal effect and only accounts for a small proportion of current deaths related to air pollution.
The study, which has been published today, 12 July, in IOP Publishing's journal Environmental Research Letters, estimates that around 470,000 people die each year because of human-caused increases in ozone.
It also estimates that around 2.1 million deaths are caused each year by human-caused increases in fine particulate matter (PM2.5) ? tiny particles suspended in the air that can penetrate deep into the lungs, causing cancer and other respiratory disease.
July 10, 2013
5-D optical memory in glass could record the last evidence of civilization
Using nanostructured glass, scientists at the University of Southampton have, for the first time, experimentally demonstrated the recording and retrieval processes of five dimensional digital data by femtosecond laser writing. The storage allows unprecedented parameters including 360 TB/disc data capacity, thermal stability up to 1000°C and practically unlimited lifetime.
Coined as the 'Superman' memory crystal, as the glass memory has been compared to the "memory crystals" used in the Superman films, the data is recorded via self-assembled nanostructures created in fused quartz, which is able to store vast quantities of data for over a million years. The information encoding is realised in five dimensions: the size and orientation in addition to the three dimensional position of these nanostructures.
A 300 kb digital copy of a text file was successfully recorded in 5D using ultrafast laser, producing extremely short and intense pulses of light. The file is written in three layers of nanostructured dots separated by five micrometres (one millionth of a metre).
Coined as the 'Superman' memory crystal, as the glass memory has been compared to the "memory crystals" used in the Superman films, the data is recorded via self-assembled nanostructures created in fused quartz, which is able to store vast quantities of data for over a million years. The information encoding is realised in five dimensions: the size and orientation in addition to the three dimensional position of these nanostructures.
A 300 kb digital copy of a text file was successfully recorded in 5D using ultrafast laser, producing extremely short and intense pulses of light. The file is written in three layers of nanostructured dots separated by five micrometres (one millionth of a metre).
June 28, 2013
New system uses low-power Wi-Fi signal to track moving humans -- even behind walls
The comic-book hero Superman uses his X-ray vision to spot bad guys lurking behind walls and other objects. Now we could all have X-ray vision, thanks to researchers at MIT's Computer Science and Artificial Intelligence Laboratory.
Researchers have long attempted to build a device capable of seeing people through walls. However, previous efforts to develop such a system have involved the use of expensive and bulky radar technology that uses a part of the electromagnetic spectrum only available to the military.
Now a system being developed by Dina Katabi, a professor in MIT's Department of Electrical Engineering and Computer Science, and her graduate student Fadel Adib, could give all of us the ability to spot people in different rooms using low-cost Wi-Fi technology. "We wanted to create a device that is low-power, portable and simple enough for anyone to use, to give people the ability to see through walls and closed doors," Katabi says.
The system, called "Wi-Vi," is based on a concept similar to radar and sonar imaging. But in contrast to radar and sonar, it transmits a low-power Wi-Fi signal and uses its reflections to track moving humans. It can do so even if the humans are in closed rooms or hiding behind a wall.
Researchers have long attempted to build a device capable of seeing people through walls. However, previous efforts to develop such a system have involved the use of expensive and bulky radar technology that uses a part of the electromagnetic spectrum only available to the military.
Now a system being developed by Dina Katabi, a professor in MIT's Department of Electrical Engineering and Computer Science, and her graduate student Fadel Adib, could give all of us the ability to spot people in different rooms using low-cost Wi-Fi technology. "We wanted to create a device that is low-power, portable and simple enough for anyone to use, to give people the ability to see through walls and closed doors," Katabi says.
The system, called "Wi-Vi," is based on a concept similar to radar and sonar imaging. But in contrast to radar and sonar, it transmits a low-power Wi-Fi signal and uses its reflections to track moving humans. It can do so even if the humans are in closed rooms or hiding behind a wall.
June 27, 2013
Solar power heads in a new direction: Thinner
Most efforts at improving solar cells have focused on increasing the efficiency of their energy conversion, or on lowering the cost of manufacturing. But now MIT researchers are opening another avenue for improvement, aiming to produce the thinnest and most lightweight solar panels possible.
Such panels, which have the potential to surpass any substance other than reactor-grade uranium in terms of energy produced per pound of material, could be made from stacked sheets of one-molecule-thick materials such as graphene or molybdenum disulfide.
Pound for pound, he says, the new solar cells produce up to 1,000 times more power than conventional photovoltaics. At about one nanometer (billionth of a meter) in thickness, "It's 20 to 50 times thinner than the thinnest solar cell that can be made today," Grossman adds. "You couldn't make a solar cell any thinner."
Such panels, which have the potential to surpass any substance other than reactor-grade uranium in terms of energy produced per pound of material, could be made from stacked sheets of one-molecule-thick materials such as graphene or molybdenum disulfide.
Pound for pound, he says, the new solar cells produce up to 1,000 times more power than conventional photovoltaics. At about one nanometer (billionth of a meter) in thickness, "It's 20 to 50 times thinner than the thinnest solar cell that can be made today," Grossman adds. "You couldn't make a solar cell any thinner."
June 25, 2013
Quantum interaction: 10,000 times faster than light
How fast do quantum interactions happen? Faster than light, 10,000 times faster.
That's what a team of physicists led by Juan Yin at the University of Science and Technology of China in Shanghai found in an experiment involving entangled photons, or photons that remain intimately connected, even when separated by vast distances.They wanted to see what would happen if you tried assigning a speed to what Einstein called "spooky action at a distance."
They didn't find anything unexpected, but that wasn't the point: in physics, sometimes it's good to be sure. The group published their work on the ArXiv.org, a preprint server for physics papers.
That's what a team of physicists led by Juan Yin at the University of Science and Technology of China in Shanghai found in an experiment involving entangled photons, or photons that remain intimately connected, even when separated by vast distances.They wanted to see what would happen if you tried assigning a speed to what Einstein called "spooky action at a distance."
They didn't find anything unexpected, but that wasn't the point: in physics, sometimes it's good to be sure. The group published their work on the ArXiv.org, a preprint server for physics papers.
Breastfeeding boosts ability to climb social ladder
Breastfeeding not only boosts children's chances of climbing the social ladder, but it also reduces the chances of downwards mobility, suggests a large study published online in the Archives of Disease in Childhood.
The findings are based on changes in the social class of two groups of individuals born in 1958 (17,419 people) and in 1970 (16,771 people).
The researchers asked each of the children's mums, when their child was five or seven years old, whether they had breastfed him/her.
They then compared people's social class as children -- based on the social class of their father when they were 10 or 11 -- with their social class as adults, measured when they were 33 or 34.
Social class was categorised on a four-point scale ranging from unskilled/semi-skilled manual to professional/managerial.
The findings are based on changes in the social class of two groups of individuals born in 1958 (17,419 people) and in 1970 (16,771 people).
The researchers asked each of the children's mums, when their child was five or seven years old, whether they had breastfed him/her.
They then compared people's social class as children -- based on the social class of their father when they were 10 or 11 -- with their social class as adults, measured when they were 33 or 34.
Social class was categorised on a four-point scale ranging from unskilled/semi-skilled manual to professional/managerial.
June 21, 2013
Plants 'seen doing quantum physics'
The idea that plants make use of quantum physics to harvest light more efficiently has received a boost.
Plants gather packets of light called photons, shuttling them deep into their cells where their energy is converted with extraordinary efficiency.
A report in Science journal adds weight to the idea that an effect called a "coherence" helps determine the most efficient path for the photons.
Experts have called the work "a nice proof" of some contentious ideas.
Plants gather packets of light called photons, shuttling them deep into their cells where their energy is converted with extraordinary efficiency.
A report in Science journal adds weight to the idea that an effect called a "coherence" helps determine the most efficient path for the photons.
Experts have called the work "a nice proof" of some contentious ideas.
Solitary mutation destroys key 'window' of brain development
Scientists from the Florida campus of The Scripps Research Institute (TSRI) have shown in animal models that brain damage caused by the loss of a single copy of a gene during very early childhood development can cause a lifetime of behavioral and intellectual problems.
The study, published this week in the Journal of Neuroscience, sheds new light on the early development of neural circuits in the cortex, the part of the brain responsible for functions such as sensory perception, planning and decision-making.
The research also pinpoints the mechanism responsible for the disruption of what are known as "windows of plasticity" that contribute to the refinement of the neural connections that broadly shape brain development and the maturing of perception, language, and cognitive abilities.
The study, published this week in the Journal of Neuroscience, sheds new light on the early development of neural circuits in the cortex, the part of the brain responsible for functions such as sensory perception, planning and decision-making.
The research also pinpoints the mechanism responsible for the disruption of what are known as "windows of plasticity" that contribute to the refinement of the neural connections that broadly shape brain development and the maturing of perception, language, and cognitive abilities.
Study: 70 Percent Of Americans On Prescription Drugs
Researchers find that nearly 70 percent of Americans are on at least one prescription drug, and more than half receive at least two prescriptions.
Mayo Clinic researchers report that antibiotics, antidepressants and painkiller opioids are the most common prescriptions given to Americans. Twenty percent of U.S. patients were also found to be on five or more prescription medications.
The study is uncovering valuable information to the researchers about U.S. prescription practices.
“Often when people talk about health conditions they’re talking about chronic conditions such as heart disease or diabetes,” Dr. St. Sauver stated in a Mayo Clinic press release. “However, the second most common prescription was for antidepressants — that suggests mental health is a huge issue and is something we should focus on. And the third most common drugs were opioids, which is a bit concerning considering their addicting nature.”
Mayo Clinic researchers report that antibiotics, antidepressants and painkiller opioids are the most common prescriptions given to Americans. Twenty percent of U.S. patients were also found to be on five or more prescription medications.
The study is uncovering valuable information to the researchers about U.S. prescription practices.
“Often when people talk about health conditions they’re talking about chronic conditions such as heart disease or diabetes,” Dr. St. Sauver stated in a Mayo Clinic press release. “However, the second most common prescription was for antidepressants — that suggests mental health is a huge issue and is something we should focus on. And the third most common drugs were opioids, which is a bit concerning considering their addicting nature.”
New Electronics Can Withstand Bodily Fluids
Electronics and bodily fluids don't mix well. But new technology enables electronic devices to function in direct contact with tissues inside the body. The technology could allow scientists to make sensors that detect the early stages of organ transplant rejection, or create artificial nerves, researchers say.
Of course, many electronic devices already reside in the body — pacemakers, for example. But their electronics don't come in direct contact with bodily fluids because they are enclosed in hermetically sealed stainless steel and sprayed with chemicals that inhibit the body's immune response (which would otherwise reject them).
"What we're doing here is [developing] electronics working in concert with the body," study researcher Paul Berger, an electrical and computer engineer at Ohio State University in Columbus, told LiveScience. One of these is a protein sensor that "could be a sort of canary in a coal mine for transplant rejection," Berger said. [5 Crazy Technologies That Are Revolutionizing Biotech]
Of course, many electronic devices already reside in the body — pacemakers, for example. But their electronics don't come in direct contact with bodily fluids because they are enclosed in hermetically sealed stainless steel and sprayed with chemicals that inhibit the body's immune response (which would otherwise reject them).
"What we're doing here is [developing] electronics working in concert with the body," study researcher Paul Berger, an electrical and computer engineer at Ohio State University in Columbus, told LiveScience. One of these is a protein sensor that "could be a sort of canary in a coal mine for transplant rejection," Berger said. [5 Crazy Technologies That Are Revolutionizing Biotech]
June 17, 2013
Scientists say new study shows pig health hurt by GMO feed
Pigs fed a diet of only genetically modified grain showed markedly higher stomach inflammation than pigs who dined on conventional feed, according to a new study by a team of Australian scientists and U.S. researchers.
The study adds to an intensifying public debate over the impact of genetically modified crops, which are widely used by U.S. and Latin American farmers and in many other countries around the world.
The study was published in the June issue of the peer-reviewed Journal of Organic Systems by researchers from Australia who worked with two veterinarians and a farmer in Iowa to study the U.S. pigs.
The study adds to an intensifying public debate over the impact of genetically modified crops, which are widely used by U.S. and Latin American farmers and in many other countries around the world.
The study was published in the June issue of the peer-reviewed Journal of Organic Systems by researchers from Australia who worked with two veterinarians and a farmer in Iowa to study the U.S. pigs.
Obese male mice father offspring with higher levels of body fat
Male mice who were fed a high-fat diet and became obese were more likely to father offspring who also had higher levels of body fat, a new Ohio University study finds.
The effect was observed primarily in male offspring, despite their consumption of a low-fat diet, scientists reported today at the annual meeting of The Endocrine Society in San Francisco, Calif.
"We've identified a number of traits that may affect metabolism and behavior of offspring dependent on the pre-conception diet of the father," said Felicia Nowak, an associate professor of biomedical sciences in Ohio University's Heritage College of Osteopathic Medicine who is lead author on the study.
The researchers point to epigenetics -- the way genes are expressed, as opposed to mutations in DNA that are "hard-wired into the genes" -- as a possible cause of these inherited traits. Because gene expression is impacted by environmental and lifestyle factors, this finding suggests that individuals with obese fathers may be able to proactively address health concerns.
The effect was observed primarily in male offspring, despite their consumption of a low-fat diet, scientists reported today at the annual meeting of The Endocrine Society in San Francisco, Calif.
"We've identified a number of traits that may affect metabolism and behavior of offspring dependent on the pre-conception diet of the father," said Felicia Nowak, an associate professor of biomedical sciences in Ohio University's Heritage College of Osteopathic Medicine who is lead author on the study.
The researchers point to epigenetics -- the way genes are expressed, as opposed to mutations in DNA that are "hard-wired into the genes" -- as a possible cause of these inherited traits. Because gene expression is impacted by environmental and lifestyle factors, this finding suggests that individuals with obese fathers may be able to proactively address health concerns.
June 11, 2013
Reversal of the Black Widow myth: Some male spiders prefer to eat old females rather than mate with them
The Black Widow spider gets its name from the popular belief that female spiders eat their male suitors after mating. However, a new study has shown that the tendency to consume a potential mate is also true of some types of male spider. The study by Lenka Sentenska and Stano Pekar from Masaryk University in the Czech Republic finds that male spiders of the Micaria sociabilis species are more likely to eat the females than be eaten. The paper, published in Springer's journal Behavioral Ecology and Sociobiology, outlines possible reasons for this behavior.
In nature, female choice of mate is commonly seen as the overriding factor affecting male mating success. Sexual cannibalism is a form of female mate choice with low-quality mates more likely to be cannibalized. However, there is not as much evidence about how males may sometimes dictate the choice of partner. The researchers suggest that in the Micaria sociabilis species, reverse cannibalism seen may be a type of male mate choice.
In nature, female choice of mate is commonly seen as the overriding factor affecting male mating success. Sexual cannibalism is a form of female mate choice with low-quality mates more likely to be cannibalized. However, there is not as much evidence about how males may sometimes dictate the choice of partner. The researchers suggest that in the Micaria sociabilis species, reverse cannibalism seen may be a type of male mate choice.
June 10, 2013
People are overly confident in their own knowledge, despite errors
Overprecision -- excessive confidence in the accuracy of our beliefs -- can have profound consequences, inflating investors' valuation of their investments, leading physicians to gravitate too quickly to a diagnosis, even making people intolerant of dissenting views. Now, new research confirms that overprecision is a common and robust form of overconfidence driven, at least in part, by excessive certainty in the accuracy of our judgments.
The research, conducted by researchers Albert Mannes of The Wharton School of the University of Pennsylvania and Don Moore of the Haas School of Business at the University of California, Berkeley, revealed that the more confident participants were about their estimates of an uncertain quantity, the less they adjusted their estimates in response to feedback about their accuracy and to the costs of being wrong.
"The findings suggest that people are too confident in what they know and underestimate what they don't know," says Mannes.
The research, conducted by researchers Albert Mannes of The Wharton School of the University of Pennsylvania and Don Moore of the Haas School of Business at the University of California, Berkeley, revealed that the more confident participants were about their estimates of an uncertain quantity, the less they adjusted their estimates in response to feedback about their accuracy and to the costs of being wrong.
"The findings suggest that people are too confident in what they know and underestimate what they don't know," says Mannes.
June 5, 2013
Energy drinks no better than caffeine, study suggests
Despite the "special blend" of ingredients, energy drinks work no better than ordinary caffeine at helping us pay attention, a new study suggests.
In the study, researchers examined participants' brain activity while they performed a task designed to require attention. Specifically, the researchers looked at how fast the brain responded to a change in letters appearing on a computer screen.
"A lot of people take the energy drinks because they think they have that extra boost over caffeine," said study researcher Chelsea Benham, a student at Centre College in Danville, Ky. But the study shows "there's really no difference," Benham said.
In terms of boosting attention, a cup of coffee "would do you just as well," if it had the same amount of caffeine as an energy drink, she said.
In the study, researchers examined participants' brain activity while they performed a task designed to require attention. Specifically, the researchers looked at how fast the brain responded to a change in letters appearing on a computer screen.
"A lot of people take the energy drinks because they think they have that extra boost over caffeine," said study researcher Chelsea Benham, a student at Centre College in Danville, Ky. But the study shows "there's really no difference," Benham said.
In terms of boosting attention, a cup of coffee "would do you just as well," if it had the same amount of caffeine as an energy drink, she said.
Helicopter takes to the skies with the power of human thought
A remote controlled helicopter has been flown through a series of hoops around a college gymnasium in Minnesota.
It sounds like your everyday student project; however, there is one caveat -- the helicopter was controlled using just the power of thought.
The experiments have been performed by researchers hoping to develop future robots that can help restore the autonomy of paralysed victims or those suffering from neurodegenerative disorders.
There were five subjects (three female, two male) who took part in the study and each one was able to successfully control the four-blade helicopter, also known as a quadcopter, quickly and accurately for a sustained amount of time.
It sounds like your everyday student project; however, there is one caveat -- the helicopter was controlled using just the power of thought.
The experiments have been performed by researchers hoping to develop future robots that can help restore the autonomy of paralysed victims or those suffering from neurodegenerative disorders.
There were five subjects (three female, two male) who took part in the study and each one was able to successfully control the four-blade helicopter, also known as a quadcopter, quickly and accurately for a sustained amount of time.
June 3, 2013
Sleep deprived men over perceive women's sexual interest and intent
A new study suggests that one night of sleep deprivation leads to an increase in men's perceptions of both women's interest in and intent to have sex.
Results show that when they were well-rested, both men and women rated the sexual intent of women as significantly lower than that of men. However, following one night of sleep deprivation, men's rating of women's sexual intent and interest increased significantly, to the extent that women were no longer seen as having lower sexual intent than men. Sleep deprivation had no significant effect on variables related to commitment.
According to the authors, sleep deprivation is known to cause frontal lobe impairment, which has a negative effect on decision-making variables such as risk-taking sensitivity, moral reasoning and inhibition. However, this is the first study to investigate the impact of sleep deprivation on romantic and sexual decision-making.
Results show that when they were well-rested, both men and women rated the sexual intent of women as significantly lower than that of men. However, following one night of sleep deprivation, men's rating of women's sexual intent and interest increased significantly, to the extent that women were no longer seen as having lower sexual intent than men. Sleep deprivation had no significant effect on variables related to commitment.
According to the authors, sleep deprivation is known to cause frontal lobe impairment, which has a negative effect on decision-making variables such as risk-taking sensitivity, moral reasoning and inhibition. However, this is the first study to investigate the impact of sleep deprivation on romantic and sexual decision-making.
Even with defects, graphene is strongest material in the world
In a new study, published in Science, Columbia Engineering researchers demonstrate that graphene, even if stitched together from many small crystalline grains, is almost as strong as graphene in its perfect crystalline form. This work resolves a contradiction between theoretical simulations, which predicted that grain boundaries can be strong, and earlier experiments, which indicated that they were much weaker than the perfect lattice.
Graphene consists of a single atomic layer of carbon, arranged in a honeycomb lattice. "Our first Science paper, in 2008, studied the strength graphene can achieve if it has no defects -- its intrinsic strength," says James Hone, professor of mechanical engineering, who led the study with Jeffrey Kysar, professor of mechanical engineering. "But defect-free, pristine graphene exists only in very small areas. Large-area sheets required for applications must contain many small grains connected at grain boundaries, and it was unclear how strong those grain boundaries were. This, our second Science paper, reports on the strength of large-area graphene films grown using chemical vapor deposition (CVD), and we're excited to say that graphene is back and stronger than ever."
Graphene consists of a single atomic layer of carbon, arranged in a honeycomb lattice. "Our first Science paper, in 2008, studied the strength graphene can achieve if it has no defects -- its intrinsic strength," says James Hone, professor of mechanical engineering, who led the study with Jeffrey Kysar, professor of mechanical engineering. "But defect-free, pristine graphene exists only in very small areas. Large-area sheets required for applications must contain many small grains connected at grain boundaries, and it was unclear how strong those grain boundaries were. This, our second Science paper, reports on the strength of large-area graphene films grown using chemical vapor deposition (CVD), and we're excited to say that graphene is back and stronger than ever."
Facebook profiles raise users' self-esteem and affect behavior
A Facebook profile is an ideal version of self, full of photos and posts curated for the eyes of family, friends and acquaintances. A new study shows that this version of self can provide beneficial psychological effects and influence behavior.
Catalina Toma, a UW-Madison assistant professor of communication arts, used the Implicit Association Test to measure Facebook users' self-esteem after they spent time looking at their profiles, the first time the social psychology research tool has been used to examine the effects of Facebook. The test showed that after participants spent just five minutes examining their own Facebook profiles, they experienced a significant boost in self-esteem. The test measures how quickly participants associate positive or negative adjectives with words such as me, my, I and myself.
"If you have high self-esteem, then you can very quickly associate words related to yourself with positive evaluations but have a difficult time associating words related to yourself with negative evaluations," Toma says. "But if you have low self-esteem, the opposite is true."
Catalina Toma, a UW-Madison assistant professor of communication arts, used the Implicit Association Test to measure Facebook users' self-esteem after they spent time looking at their profiles, the first time the social psychology research tool has been used to examine the effects of Facebook. The test showed that after participants spent just five minutes examining their own Facebook profiles, they experienced a significant boost in self-esteem. The test measures how quickly participants associate positive or negative adjectives with words such as me, my, I and myself.
"If you have high self-esteem, then you can very quickly associate words related to yourself with positive evaluations but have a difficult time associating words related to yourself with negative evaluations," Toma says. "But if you have low self-esteem, the opposite is true."
Asking for a precise number during negotiations can give you the upper hand
With so much on the line for job seekers in this difficult economic climate, a lot of new hires might be wondering how -- or whether at all -- to negotiate salary when offered a new position. A recently published study on the art of negotiation by two professors at Columbia Business School could help these new hires -- and all negotiators -- seal a stronger deal than before.
Research conducted by Professors Malia Mason and Daniel Ames and doctoral students Alice Lee and Elizabeth Wiley finds that asking for a specific and precise dollar amount versus a rounded-off dollar amount can give you the upper hand during any negotiation over a quantity.
"What we discovered is there is a big difference in what most people think is a good strategy when negotiating and what research shows is a good strategy," said Professor Mason. "Negotiators should remember that in this case, zero's really do add nothing to the bargaining table."
Research conducted by Professors Malia Mason and Daniel Ames and doctoral students Alice Lee and Elizabeth Wiley finds that asking for a specific and precise dollar amount versus a rounded-off dollar amount can give you the upper hand during any negotiation over a quantity.
"What we discovered is there is a big difference in what most people think is a good strategy when negotiating and what research shows is a good strategy," said Professor Mason. "Negotiators should remember that in this case, zero's really do add nothing to the bargaining table."
May 30, 2013
Omega-3 fatty acids may help heal a broken heart
Procedures like angioplasty, stenting and bypass surgery may save lives, but they also cause excessive inflammation and scarring, which ultimately can lead to permanent disability and even death. A new research report appearing in The FASEB Journal, shows that naturally derived compounds from polyunsaturated fatty acids (omega-3s) may reduce the inflammation associated with these procedures to help arteries more fully and completely heal.
"Our study suggests that biologically active, naturally occurring compounds derived from omega-3 PUFAs reduce inflammation and improve the healing of blood vessels after injury," said Michael S. Conte, M.D., a researcher involved in the work from Division of Vascular and Endovascular Surgery and the Heart and Vascular Center at the University of California, in San Francisco, CA. "They suggest a new opportunity to improve the long-term results of cardiovascular procedures such as bypass surgery and angioplasty by the therapeutic application of this class of agents or their dietary precursors."
To make this discovery, Conte and colleagues studied the effects of the compounds (resolvin or RvD) first in cultured vascular cells taken from patients who had undergone bypass operations, and then in rabbits who were treated with a balloon angioplasty procedure in the arteries of the hind limb. In the human cells, treatment with RvD dramatically reduced features that are associated with the typical vascular injury response -- inflammation, cell migration, and cell growth in vascular smooth muscle cells. The potency of these compounds corresponds to concentrations that have been measured in the blood of human subjects taking high dose fish oil supplements for short periods of time. In rabbits, researchers treated the artery with RvD at the time of the balloon angioplasty procedure by infusing the drug directly into the vessel, and found that this one-time treatment reduced inflammation and subsequent scarring of the vessel after one month.
"Our study suggests that biologically active, naturally occurring compounds derived from omega-3 PUFAs reduce inflammation and improve the healing of blood vessels after injury," said Michael S. Conte, M.D., a researcher involved in the work from Division of Vascular and Endovascular Surgery and the Heart and Vascular Center at the University of California, in San Francisco, CA. "They suggest a new opportunity to improve the long-term results of cardiovascular procedures such as bypass surgery and angioplasty by the therapeutic application of this class of agents or their dietary precursors."
To make this discovery, Conte and colleagues studied the effects of the compounds (resolvin or RvD) first in cultured vascular cells taken from patients who had undergone bypass operations, and then in rabbits who were treated with a balloon angioplasty procedure in the arteries of the hind limb. In the human cells, treatment with RvD dramatically reduced features that are associated with the typical vascular injury response -- inflammation, cell migration, and cell growth in vascular smooth muscle cells. The potency of these compounds corresponds to concentrations that have been measured in the blood of human subjects taking high dose fish oil supplements for short periods of time. In rabbits, researchers treated the artery with RvD at the time of the balloon angioplasty procedure by infusing the drug directly into the vessel, and found that this one-time treatment reduced inflammation and subsequent scarring of the vessel after one month.
Brain makes its own version of Valium
Researchers at the Stanford University School of Medicine have found that a naturally occurring protein secreted only in discrete areas of the mammalian brain may act as a Valium-like brake on certain types of epileptic seizures.
The protein is known as diazepam binding inhibitor, or DBI. It calms the rhythms of a key brain circuit and so could prove valuable in developing novel, less side-effect-prone therapies not only for epilepsy but possibly for anxiety and sleep disorders, too. The researchers' discoveries will be published May 30 in Neuron.
"This is one of the most exciting findings we have had in many years," said John Huguenard, PhD, professor of neurology and neurological sciences and the study's senior author. "Our results show for the first time that a nucleus deep in the middle of the brain generates a small protein product, or peptide, that acts just like benzodiazepines." This drug class includes not only the anti-anxiety compound Valium (generic name diazepam), first marketed in 1965, but its predecessor Librium, discovered in 1955, and the more recently developed sleep aid Halcyon.
The protein is known as diazepam binding inhibitor, or DBI. It calms the rhythms of a key brain circuit and so could prove valuable in developing novel, less side-effect-prone therapies not only for epilepsy but possibly for anxiety and sleep disorders, too. The researchers' discoveries will be published May 30 in Neuron.
"This is one of the most exciting findings we have had in many years," said John Huguenard, PhD, professor of neurology and neurological sciences and the study's senior author. "Our results show for the first time that a nucleus deep in the middle of the brain generates a small protein product, or peptide, that acts just like benzodiazepines." This drug class includes not only the anti-anxiety compound Valium (generic name diazepam), first marketed in 1965, but its predecessor Librium, discovered in 1955, and the more recently developed sleep aid Halcyon.
Global warming caused by CFCs, not carbon dioxide, researcher claims in controversial study
Chlorofluorocarbons (CFCs) are to blame for global warming since the 1970s and not carbon dioxide, according to a researcher from the University of Waterloo in a controversial new study published in the International Journal of Modern Physics B this week.
CFCs are already known to deplete ozone, but in-depth statistical analysis now suggests that CFCs are also the key driver in global climate change, rather than carbon dioxide (CO2) emissions, the researcher argues.
"Conventional thinking says that the emission of human-made non-CFC gases such as carbon dioxide has mainly contributed to global warming. But we have observed data going back to the Industrial Revolution that convincingly shows that conventional understanding is wrong," said Qing-Bin Lu, a professor of physics and astronomy, biology and chemistry in Waterloo's Faculty of Science. "In fact, the data shows that CFCs conspiring with cosmic rays caused both the polar ozone hole and global warming."
CFCs are already known to deplete ozone, but in-depth statistical analysis now suggests that CFCs are also the key driver in global climate change, rather than carbon dioxide (CO2) emissions, the researcher argues.
"Conventional thinking says that the emission of human-made non-CFC gases such as carbon dioxide has mainly contributed to global warming. But we have observed data going back to the Industrial Revolution that convincingly shows that conventional understanding is wrong," said Qing-Bin Lu, a professor of physics and astronomy, biology and chemistry in Waterloo's Faculty of Science. "In fact, the data shows that CFCs conspiring with cosmic rays caused both the polar ozone hole and global warming."
Low doses of THC (cannabis) can halt brain damage, study suggests
Though marijuana is a well-known recreational drug, extensive scientific research has been conducted on the therapeutic properties of marijuana in the last decade. Medical cannabis is often used by sufferers of chronic ailments, including cancer and post-traumatic stress disorder, to combat pain, insomnia, lack of appetite, and other symptoms.
Now Prof. Yosef Sarne of Tel Aviv University's Adelson Center for the Biology of Addictive Diseases at the Sackler Faculty of Medicine says that the drug has neuroprotective qualities as well. He has found that extremely low doses of THC -- the psychoactive component of marijuana -- protects the brain from long-term cognitive damage in the wake of injury from hypoxia (lack of oxygen), seizures, or toxic drugs. Brain damage can have consequences ranging from mild cognitive deficits to severe neurological damage.
Previous studies focused on injecting high doses of THC within a very short time frame -- approximately 30 minutes -- before or after injury. Prof. Sarne's current research, published in the journals Behavioural Brain Research and Experimental Brain Research, demonstrates that even extremely low doses of THC -- around 1,000 to 10,000 times less than that in a conventional marijuana cigarette -- administered over a wide window of 1 to 7 days before or 1 to 3 days after injury can jumpstart biochemical processes which protect brain cells and preserve cognitive function over time.
Now Prof. Yosef Sarne of Tel Aviv University's Adelson Center for the Biology of Addictive Diseases at the Sackler Faculty of Medicine says that the drug has neuroprotective qualities as well. He has found that extremely low doses of THC -- the psychoactive component of marijuana -- protects the brain from long-term cognitive damage in the wake of injury from hypoxia (lack of oxygen), seizures, or toxic drugs. Brain damage can have consequences ranging from mild cognitive deficits to severe neurological damage.
Previous studies focused on injecting high doses of THC within a very short time frame -- approximately 30 minutes -- before or after injury. Prof. Sarne's current research, published in the journals Behavioural Brain Research and Experimental Brain Research, demonstrates that even extremely low doses of THC -- around 1,000 to 10,000 times less than that in a conventional marijuana cigarette -- administered over a wide window of 1 to 7 days before or 1 to 3 days after injury can jumpstart biochemical processes which protect brain cells and preserve cognitive function over time.
Atom by atom, bond by bond, a chemical reaction caught in the act
When Felix Fischer of the U.S. Department of Energy's Lawrence Berkeley National Laboratory (Berkeley Lab) set out to develop nanostructures made of graphene using a new, controlled approach to chemical reactions, the first result was a surprise: spectacular images of individual carbon atoms and the bonds between them.
"We weren't thinking about making beautiful images; the reactions themselves were the goal," says Fischer, a staff scientist in Berkeley Lab's Materials Sciences Division (MSD) and a professor of chemistry at the University of California, Berkeley. "But to really see what was happening at the single-atom level we had to use a uniquely sensitive atomic force microscope in Michael Crommie's laboratory." Crommie is an MSD scientist and a professor of physics at UC Berkeley.
What the microscope showed the researchers, says Fischer, "was amazing." The specific outcomes of the reaction were themselves unexpected, but the visual evidence was even more so. "Nobody has ever taken direct, single-bond-resolved images of individual molecules, right before and immediately after a complex organic reaction," Fischer says.
"We weren't thinking about making beautiful images; the reactions themselves were the goal," says Fischer, a staff scientist in Berkeley Lab's Materials Sciences Division (MSD) and a professor of chemistry at the University of California, Berkeley. "But to really see what was happening at the single-atom level we had to use a uniquely sensitive atomic force microscope in Michael Crommie's laboratory." Crommie is an MSD scientist and a professor of physics at UC Berkeley.
What the microscope showed the researchers, says Fischer, "was amazing." The specific outcomes of the reaction were themselves unexpected, but the visual evidence was even more so. "Nobody has ever taken direct, single-bond-resolved images of individual molecules, right before and immediately after a complex organic reaction," Fischer says.
New mathematical model links space-time theories
Researchers at the University of Southampton have taken a significant step in a project to unravel the secrets of the structure of our Universe.
Professor Kostas Skenderis, Chair in Mathematical Physics at the University, comments: "One of the main recent advances in theoretical physics is the holographic principle. According to this idea, our Universe may be thought of as a hologram and we would like to understand how to formulate the laws of physics for such a holographic Universe."
A new paper released by Professor Skenderis and Dr Marco Caldarelli from the University of Southampton, Dr Joan Camps from the University of Cambridge and Dr Blaise Goutéraux from the Nordic Institute for Theoretical Physics, Sweden published in the Rapid Communication section of 'Physical Review D', makes connections between negatively curved space-time and flat space-time.
Space-time is usually understood to describe space existing in three dimensions, with time playing the role of a fourth dimension and all four coming together to form a continuum, or a state in which the four elements can't be distinguished from each other.
Professor Kostas Skenderis, Chair in Mathematical Physics at the University, comments: "One of the main recent advances in theoretical physics is the holographic principle. According to this idea, our Universe may be thought of as a hologram and we would like to understand how to formulate the laws of physics for such a holographic Universe."
A new paper released by Professor Skenderis and Dr Marco Caldarelli from the University of Southampton, Dr Joan Camps from the University of Cambridge and Dr Blaise Goutéraux from the Nordic Institute for Theoretical Physics, Sweden published in the Rapid Communication section of 'Physical Review D', makes connections between negatively curved space-time and flat space-time.
Space-time is usually understood to describe space existing in three dimensions, with time playing the role of a fourth dimension and all four coming together to form a continuum, or a state in which the four elements can't be distinguished from each other.
Allergic to Science-Proteins and Allergens in Our Genetically Engineered Food
A healthy farm practices sustainable agriculture, which means it must do three things well:
1) Productivity. A healthy farm produces food in abundance.
2) Economic viability. A healthy farm is a thriving business that provides a good living and fair working conditions to those who work on it, and contributes to a robust local and regional economy.
3) Environmental stewardship. A healthy farm maintains the fertility of the soil and the health of the surrounding landscape for future generations.
Current industrial farming practices in the US accomplish the first and second goals quite well, but these practices tend to be unsustainable and fail the "Environmental Stewardship" plank pretty miserably. The UCS's concern about the dire state of our food system is well-founded, and I applaud their efforts to get out in front of the policy debate. There's just one problem: they oppose using all of our technology to help combat this problem. Specifically, I'm talking about genetic engineering (GE) and genetically modified organisms (GMO).
1) Productivity. A healthy farm produces food in abundance.
2) Economic viability. A healthy farm is a thriving business that provides a good living and fair working conditions to those who work on it, and contributes to a robust local and regional economy.
3) Environmental stewardship. A healthy farm maintains the fertility of the soil and the health of the surrounding landscape for future generations.
Current industrial farming practices in the US accomplish the first and second goals quite well, but these practices tend to be unsustainable and fail the "Environmental Stewardship" plank pretty miserably. The UCS's concern about the dire state of our food system is well-founded, and I applaud their efforts to get out in front of the policy debate. There's just one problem: they oppose using all of our technology to help combat this problem. Specifically, I'm talking about genetic engineering (GE) and genetically modified organisms (GMO).
May 29, 2013
Women donate less to charity than men in some contexts
Given the chance, women are more likely than men to opt out of a request to give a charitable donation, a group of economists have found.
The issue of which gender is more generous has been debated for years. A new field experiment conducted by scholars at the University of Chicago and University of California, Berkeley shows that when it's easy to avoid making a donation, such as not responding to a door-to-door solicitor, women are less likely than men to give.
"The opt-out option lowers both the share of people answering the door and the share of individuals giving," he said. The drop in women's giving largely drives this change, List explained.
About three percent of women and men gave money when the visit was unannounced. When allowed to opt-out, men's giving dropped slightly, while women's giving fell to about half of the level of previous giving.
The issue of which gender is more generous has been debated for years. A new field experiment conducted by scholars at the University of Chicago and University of California, Berkeley shows that when it's easy to avoid making a donation, such as not responding to a door-to-door solicitor, women are less likely than men to give.
"The opt-out option lowers both the share of people answering the door and the share of individuals giving," he said. The drop in women's giving largely drives this change, List explained.
About three percent of women and men gave money when the visit was unannounced. When allowed to opt-out, men's giving dropped slightly, while women's giving fell to about half of the level of previous giving.
Good for the world, good for shareholders: Study finds social responsibility means less risky stock prices
Firms that make greater investments in corporate social responsibility (CSR) initiatives see less risk in their stock prices during economic downturns, according to a new study from the University of Iowa.
The research, by Art Durnev, assistant professor of finance in the Tippie College of Business, suggests that those companies have greater brand loyalty, so customers keep buying their products and paying a premium for them, regardless of the overall economy. That stability in turn reduces those firms' costs of equity capital, further reducing its overall risk.
CSR has become an increasingly important part of business in recent years, as more customers look to buy from companies with practices that match their own values, especially when it comes to environmental issues. While research has shown that companies like Patagonia and Ben & Jerry's have increased brand loyalty because of their extensive CSR initiatives, Durnev says little research has been done to see how that loyalty affects firms' stock prices.
The research, by Art Durnev, assistant professor of finance in the Tippie College of Business, suggests that those companies have greater brand loyalty, so customers keep buying their products and paying a premium for them, regardless of the overall economy. That stability in turn reduces those firms' costs of equity capital, further reducing its overall risk.
CSR has become an increasingly important part of business in recent years, as more customers look to buy from companies with practices that match their own values, especially when it comes to environmental issues. While research has shown that companies like Patagonia and Ben & Jerry's have increased brand loyalty because of their extensive CSR initiatives, Durnev says little research has been done to see how that loyalty affects firms' stock prices.
Walking or bicycling to work influenced by others
People who walk or bike to work are likely to influence their co-workers and partners to do the same, according to health researchers.
"Social influences are important, specifically interpersonal influences, such as spouses and co-workers," said Melissa Bopp, assistant professor of kinesiology, Penn State. She emphasized that community and employers also significantly influence whether people choose to actively commute.
More than 80 percent of American adults do not meet the guidelines for aerobic and muscle-strengthening activities, according to Healthy People 2020, a federal initiative that sets national objectives and monitors progress concerning the health of the population. Regardless of a chronic disease or disability, any regular physical activity can improve health and quality of life. The U.S. Department of Health and Human Services recommends at least two and a half hours of moderate-intensity aerobic activity a week or one hour and 15 minutes of vigorous-intensity activity a week for adults.
Active commuting (AC) -- physical exercise, such as bicycling or walking, as a way to travel to and from work -- is one way to help adults integrate the recommended activity into their daily routine.
"Social influences are important, specifically interpersonal influences, such as spouses and co-workers," said Melissa Bopp, assistant professor of kinesiology, Penn State. She emphasized that community and employers also significantly influence whether people choose to actively commute.
More than 80 percent of American adults do not meet the guidelines for aerobic and muscle-strengthening activities, according to Healthy People 2020, a federal initiative that sets national objectives and monitors progress concerning the health of the population. Regardless of a chronic disease or disability, any regular physical activity can improve health and quality of life. The U.S. Department of Health and Human Services recommends at least two and a half hours of moderate-intensity aerobic activity a week or one hour and 15 minutes of vigorous-intensity activity a week for adults.
Active commuting (AC) -- physical exercise, such as bicycling or walking, as a way to travel to and from work -- is one way to help adults integrate the recommended activity into their daily routine.
Einstein's 'spooky action' common in large quantum systems
Entanglement is a property in quantum mechanics that seemed so unbelievable and so lacking in detail that, 66 years ago this spring, Einstein called it "spooky action at a distance."
But a mathematician at Case Western Reserve University and two of his recent PhD graduates show entanglement is actually prevalent in large quantum systems and have identified the threshold at which it occurs.
The finding holds promise for the ongoing push to understand and take advantage of the property. If harnessed, entanglement could yield super high-speed communications, hack-proof encryptions and quantum computers so fast and powerful they would make today's supercomputers look like adding machines in comparison.
But a mathematician at Case Western Reserve University and two of his recent PhD graduates show entanglement is actually prevalent in large quantum systems and have identified the threshold at which it occurs.
The finding holds promise for the ongoing push to understand and take advantage of the property. If harnessed, entanglement could yield super high-speed communications, hack-proof encryptions and quantum computers so fast and powerful they would make today's supercomputers look like adding machines in comparison.
May 23, 2013
'Worrying declines' for UK species
A major new report from 25 wildlife organisations, assessing the state of Britain's Nature, is warning that many species of wildlife are facing extinction in the UK unless urgent action is taken.
It looked at more than 3,000 native species, 60 percent of which were found to be in long-term decline.
The BBC's Science Editor David Shukman reports.
It looked at more than 3,000 native species, 60 percent of which were found to be in long-term decline.
The BBC's Science Editor David Shukman reports.
Quest for quantum computing advanced
Research teams from UW-Milwaukee and the University of York investigating the properties of ultra-thin films of new materials are helping bring quantum computing one step closer to reality.
An on-going collaboration between physicists from York and the University of Wisconsin, Milwaukee, USA, is focusing on understanding, tailoring and tuning the electronic properties of topological insulators (TI) - new materials with surfaces that host a quantum state of matter – at the nanoscale.
Understanding the properties of thin films of the new materials and integrating them with semiconductors is an important step in creating a materials platform for quantum computers.
Professor Lian Li, from UW-Milwaukee, said: “The electrons on the surface of this material have some intriguing properties. All electrons are spinning in a quantum mechanical way, and spins are constantly knocked by random collisions (scattering).
An on-going collaboration between physicists from York and the University of Wisconsin, Milwaukee, USA, is focusing on understanding, tailoring and tuning the electronic properties of topological insulators (TI) - new materials with surfaces that host a quantum state of matter – at the nanoscale.
Understanding the properties of thin films of the new materials and integrating them with semiconductors is an important step in creating a materials platform for quantum computers.
Professor Lian Li, from UW-Milwaukee, said: “The electrons on the surface of this material have some intriguing properties. All electrons are spinning in a quantum mechanical way, and spins are constantly knocked by random collisions (scattering).
3D Printers Demonstrate Rapid Robot Evolution
Robots are simply more efficient than humans at certain tasks. They already excel at building cars, exploring distant planets and hunting for explosives, but it turns out that robots might also evolve much faster than their flesh-and-blood counterparts.
Nick Cheney, a Ph.D. student at Cornell University, presented his research at an Inside Cornell lecture on May 21. Cheney has developed a method by which complex computer simulations in a specific virtual environment — robots, by his definition — can evolve from selective pressures, just like animals in nature, but on a timescale of days instead of countless generations.
To demonstrate the technology, Cheney showed how a series of diverse but effective robots spontaneously evolved from a single, inefficient ancestor. He programmed a virtual environment with only one parameter: robots that moved faster would be able to produce more offspring. Therefore, the only selective pressure was speed (in the wild, Cheney compared this behavior to running from predators).
"Nature is amazing in how it designs things," Cheney said. "We want robots to interact with their environments as naturally as animals do." Cheney considers natural selection — the process by which biological organisms survive, reproduce and change over time to better suit their environments — to be a natural algorithm, extremely similar to what engineers use to optimize robots over time.
Nick Cheney, a Ph.D. student at Cornell University, presented his research at an Inside Cornell lecture on May 21. Cheney has developed a method by which complex computer simulations in a specific virtual environment — robots, by his definition — can evolve from selective pressures, just like animals in nature, but on a timescale of days instead of countless generations.
To demonstrate the technology, Cheney showed how a series of diverse but effective robots spontaneously evolved from a single, inefficient ancestor. He programmed a virtual environment with only one parameter: robots that moved faster would be able to produce more offspring. Therefore, the only selective pressure was speed (in the wild, Cheney compared this behavior to running from predators).
"Nature is amazing in how it designs things," Cheney said. "We want robots to interact with their environments as naturally as animals do." Cheney considers natural selection — the process by which biological organisms survive, reproduce and change over time to better suit their environments — to be a natural algorithm, extremely similar to what engineers use to optimize robots over time.
May 22, 2013
The secret to a long and healthy life? A HIGH-rise flat: People who live below the eighth floor are 22% more likely to die early
People living above the 8th floor are 40% less likely to die from lung disease
They are also 35% less likely to die from severe heart disease
Could be because walking up and down the stairs means they are fitter
They are also exposed to less pollution and noise than those at ground level
But those living on the ground floor are 60% less likely to commit suicide by jumping
--------------------------
For years, tower blocks were mostly associated with poverty and deprivation.
But now it seems living in a high-rise flat could be the secret to a long and healthy life.
New research shows the higher the floor you live on, the greater your life expectancy.
Experts at the University of Bern in Switzerland found the chances of dying from serious lung disease was 40 per greater among residents who lived on the ground floor compared to those with a flat on the eighth floor or above.
They are also 35% less likely to die from severe heart disease
Could be because walking up and down the stairs means they are fitter
They are also exposed to less pollution and noise than those at ground level
But those living on the ground floor are 60% less likely to commit suicide by jumping
--------------------------
For years, tower blocks were mostly associated with poverty and deprivation.
But now it seems living in a high-rise flat could be the secret to a long and healthy life.
New research shows the higher the floor you live on, the greater your life expectancy.
Experts at the University of Bern in Switzerland found the chances of dying from serious lung disease was 40 per greater among residents who lived on the ground floor compared to those with a flat on the eighth floor or above.
Could eating less save your brain? Study shows reducing calorie intake delays nerve cell loss
Calorie restriction may not always be fun, but cutting back has benefits beyond even weight loss. Studies have shown that eating less can help slow aging, prolong life and even decrease the effects of diseases like Alzheimer’s in a variety of organisms.
Based on this knowledge, a group of researchers from the Massachusetts Institute of Technology (MIT) decided to dig further and ask: Could calorie restriction also delay nerve cell loss in the brain – and the changes in learning and memory that go along with it?
“We reasoned – and other folks reasoned – that because cognitive decline and neurodegeneration are characteristics of the aging process, that calorie restriction might also work in the brain to slow neurodegeneration,” lead study author, Dr. Johannes Gräff from the Picower Institute for Learning and Memory at MIT, and Howard Hughes Medical Institute, told FoxNews.com.
Based on this knowledge, a group of researchers from the Massachusetts Institute of Technology (MIT) decided to dig further and ask: Could calorie restriction also delay nerve cell loss in the brain – and the changes in learning and memory that go along with it?
“We reasoned – and other folks reasoned – that because cognitive decline and neurodegeneration are characteristics of the aging process, that calorie restriction might also work in the brain to slow neurodegeneration,” lead study author, Dr. Johannes Gräff from the Picower Institute for Learning and Memory at MIT, and Howard Hughes Medical Institute, told FoxNews.com.
NASA to build a 'universal food synthesizer' to create 3D food printer made from insects and algae.
The kitchen of the future could see all our fancy devices – even refrigerators and ovens - replaced by a 3D printer which will create meals from cartridges full of carbohydrates, protein powders and oils.
The concept might sound rather far-fetched today, but NASA has just given 3D printer firm Systems & Materials Research Corporation (SMRC) a six month, $125,000 grant to focus on developing a universal food synthesizer.
The device is similar to the ‘replicator’ used in several of the Star Trek TV series which enabled crew members to create their favorite foods.
The concept might sound rather far-fetched today, but NASA has just given 3D printer firm Systems & Materials Research Corporation (SMRC) a six month, $125,000 grant to focus on developing a universal food synthesizer.
The device is similar to the ‘replicator’ used in several of the Star Trek TV series which enabled crew members to create their favorite foods.
Vitamin C kills drug-resistant TB in lab tests
Vitamin C can kill multidrug-resistant TB in the lab, scientists have found.
The surprise discovery may point to a new way of tackling this increasingly hard-to-treat infection, the US study authors from Yeshiva University say in Nature Communications.
An estimated 650,000 people worldwide have multidrug-resistant TB.
Studies are now needed to see if a treatment that works using the same action as vitamin C would be useful as a TB drug in humans.
The surprise discovery may point to a new way of tackling this increasingly hard-to-treat infection, the US study authors from Yeshiva University say in Nature Communications.
An estimated 650,000 people worldwide have multidrug-resistant TB.
Studies are now needed to see if a treatment that works using the same action as vitamin C would be useful as a TB drug in humans.
Phthalates -- chemicals widely found in plastics and processed food -- linked to elevated blood pressure in children and teens
Plastic additives known as phthalates (pronounced THAL-ates) are odorless, colorless and just about everywhere: They turn up in flooring, plastic cups, beach balls, plastic wrap, intravenous tubing and -- according to the Centers for Disease Control and Prevention -- the bodies of most Americans. Once perceived as harmless, phthalates have come under increasing scrutiny. A growing collection of evidence suggests dietary exposure to phthalates (which can leech from packaging and mix with food) may cause significant metabolic and hormonal abnormalities, especially during early development.
Now, new research published this Wednesday in The Journal of Pediatrics suggests that certain types of phthalates could pose another risk to children: compromised heart health. Drawing on data from a nationally representative survey of nearly 3,000 children and teens, researchers at NYU Langone Medical Center, in collaboration with researchers at the University of Washington and Penn State University School of Medicine, have documented for the first time a connection between dietary exposure to DEHP (di-2-ethyhexylphthalate), a common class of phthalate widely used in industrial food production, and elevated systolic blood pressure, a measure of pressure in the arteries when the heart contracts.
"Phthalates can inhibit the function of cardiac cells and cause oxidative stress that compromises the health of arteries. But no one has explored the relationship between phthalate exposure and heart health in children" says lead author Leonardo Trasande, MD, MPP, associate professor of pediatrics, environmental medicine and population health at NYU Langone Medical Center. "We wanted to examine the link between phthalates and childhood blood pressure in particular given the increase in elevated blood pressure in children and the increasing evidence implicating exposure to environmental exposures in early development of disease."
Now, new research published this Wednesday in The Journal of Pediatrics suggests that certain types of phthalates could pose another risk to children: compromised heart health. Drawing on data from a nationally representative survey of nearly 3,000 children and teens, researchers at NYU Langone Medical Center, in collaboration with researchers at the University of Washington and Penn State University School of Medicine, have documented for the first time a connection between dietary exposure to DEHP (di-2-ethyhexylphthalate), a common class of phthalate widely used in industrial food production, and elevated systolic blood pressure, a measure of pressure in the arteries when the heart contracts.
"Phthalates can inhibit the function of cardiac cells and cause oxidative stress that compromises the health of arteries. But no one has explored the relationship between phthalate exposure and heart health in children" says lead author Leonardo Trasande, MD, MPP, associate professor of pediatrics, environmental medicine and population health at NYU Langone Medical Center. "We wanted to examine the link between phthalates and childhood blood pressure in particular given the increase in elevated blood pressure in children and the increasing evidence implicating exposure to environmental exposures in early development of disease."
Big Data – for better or worse: 90% of world's data generated over last two years
A full 90% of all the data in the world has been generated over the last two years. The internet companies are awash with data that can be grouped and utilised. Is this a good thing?
An increasing amount of data is becoming available on the internet. Each and every one of us is constantly producing and releasing data about ourselves. We do this either by moving around passively -- our behaviour being registered by cameras or card usage -- or by logging onto our PCs and surfing the net.
The volumes of data make up what has been designated 'Big Data' -- where data about individuals, groups and periods of time are combined into bigger groups or longer periods of time.
An increasing amount of data is becoming available on the internet. Each and every one of us is constantly producing and releasing data about ourselves. We do this either by moving around passively -- our behaviour being registered by cameras or card usage -- or by logging onto our PCs and surfing the net.
The volumes of data make up what has been designated 'Big Data' -- where data about individuals, groups and periods of time are combined into bigger groups or longer periods of time.
May 21, 2013
The Wright Brothers were NOT the first to fly a plane - A German pilot beat them to it two years earlier in a flying car, claims leading aviation journal
The Wright Brothers are famous for flying the world's first successful airplane in 1903 - yet they may have been beaten to the record two years earlier, according to a prestigious aviation journal.
Jane's All The World's Aircraft claims in its 100th anniversary edition that German aviation pioneer Gustav Weisskopf was actually the first man to successfully build and fly his 'Condor' plane in August 1901.
And according to reports, Weisskopf - who emigrated to America and changed his name to Whitehead - may have also been the first person to invent the flying car.
Jane's All The World's Aircraft claims in its 100th anniversary edition that German aviation pioneer Gustav Weisskopf was actually the first man to successfully build and fly his 'Condor' plane in August 1901.
And according to reports, Weisskopf - who emigrated to America and changed his name to Whitehead - may have also been the first person to invent the flying car.
Anabolic steroids may affect future mental health
There is a link between use of anabolic-androgenic steroids and reduced mental health later in life. This is the main conclusion of a new study on elite male strength athletes that researchers from the University of Gothenburg recently published in the British Journal of Sports Medicine. Twenty per cent of the subjects in the study admitted steroid use.
The study is published by CERA, which is the University of Gothenburg's centre for education and research on addiction. Together with colleagues from Sahlgrenska University Hospital, they found a connection between abuse of anabolic-androgenic steroids (AAS) and mental health problems many years later.
The study included almost 700 former Swedish wrestlers, weightlifters, powerlifters and throwers who competed at the elite level sometime between 1960 and 1979. Twenty per cent of them admitted using steroids during their active careers. The purpose of the study was to look for links between AAS use and mental problems.
The study is published by CERA, which is the University of Gothenburg's centre for education and research on addiction. Together with colleagues from Sahlgrenska University Hospital, they found a connection between abuse of anabolic-androgenic steroids (AAS) and mental health problems many years later.
The study included almost 700 former Swedish wrestlers, weightlifters, powerlifters and throwers who competed at the elite level sometime between 1960 and 1979. Twenty per cent of them admitted using steroids during their active careers. The purpose of the study was to look for links between AAS use and mental problems.
One in 10 teens using 'study drugs,' but parents aren't paying attention
As high schoolers prepare for final exams, teens nationwide may be tempted to use a "study drug" - a prescription stimulant or amphetamine -- to gain an academic edge. But a new University of Michigan poll shows only one in 100 parents of teens 13-17 years old believes that their teen has used a study drug.
Study drugs refer to stimulant medications typically prescribed for the treatment of attention deficit hyperactivity disorder (ADHD); commonly prescribed medicines in this category include Adderall, Concerta, Ritalin, and Vyvanse.
Among parents of teens who have not been prescribed a stimulant medication for ADHD, just 1% said they believe their teen has used a study drug to help study or improve grades, according to the latest University of Michigan Mott Children's Hospital National Poll on Children's Health. However, recent national data from Monitoring the Future indicate that 10% of high school sophomores and 12% of high school seniors say they've used an amphetamine or stimulant medication not prescribed by their doctor.
Study drugs refer to stimulant medications typically prescribed for the treatment of attention deficit hyperactivity disorder (ADHD); commonly prescribed medicines in this category include Adderall, Concerta, Ritalin, and Vyvanse.
Among parents of teens who have not been prescribed a stimulant medication for ADHD, just 1% said they believe their teen has used a study drug to help study or improve grades, according to the latest University of Michigan Mott Children's Hospital National Poll on Children's Health. However, recent national data from Monitoring the Future indicate that 10% of high school sophomores and 12% of high school seniors say they've used an amphetamine or stimulant medication not prescribed by their doctor.
Air pollution and noise pollution increase cardiovascular risk
Both fine-particle air pollution and noise pollution may increase a person's risk of developing cardiovascular disease, according to German researchers who have conducted a large population study, in which both factors were considered simultaneously.
"Many studies have looked at air pollution, while others have looked at noise pollution," said study leader Barbara Hoffmann, MD, MPH, a professor of environmental epidemiology at the IUF Leibniz Research Institute for Environmental Medicine in Germany. "This study looked at both at the same time and found that each form of pollution was independently associated with subclinical atherosclerosis."
"This study is important because it says that both air pollution and noise pollution represent important health problems," said Dr. Philip Harber, a professor of public health at the University of Arizona who was not involved in the research. "In the past, some air pollution studies have been dismissed because critics said it was probably the noise pollution that caused the harm, and vice versa. Now we know that people who live near highways, for instance, are being harmed by air pollution and by noise pollution."
"Many studies have looked at air pollution, while others have looked at noise pollution," said study leader Barbara Hoffmann, MD, MPH, a professor of environmental epidemiology at the IUF Leibniz Research Institute for Environmental Medicine in Germany. "This study looked at both at the same time and found that each form of pollution was independently associated with subclinical atherosclerosis."
"This study is important because it says that both air pollution and noise pollution represent important health problems," said Dr. Philip Harber, a professor of public health at the University of Arizona who was not involved in the research. "In the past, some air pollution studies have been dismissed because critics said it was probably the noise pollution that caused the harm, and vice versa. Now we know that people who live near highways, for instance, are being harmed by air pollution and by noise pollution."
How bilinguals switch between languages
Individuals who learn two languages at an early age seem to switch back and forth between separate "sound systems" for each language, according to new research conducted at the University of Arizona.
The research, to be published in a forthcoming issue of Psychological Science, a journal of the Association for Psychological Science, addresses enduring questions in bilingual studies about how bilingual speakers hear and process sound in two different languages.
"A lot of research has shown that bilinguals are pretty good at accommodating speech variation across languages, but there's been a debate as to how," said lead author Kalim Gonzales, a psychology doctoral student at the University of Arizona. "There are two views: One is that bilinguals have different processing modes for their two languages -- they have a mode for processing speech in one language and then a mode for processing speech in the other language. Another view is that bilinguals just adjust to speech variation by recalibrating to the unique acoustic properties of each language."
The research, to be published in a forthcoming issue of Psychological Science, a journal of the Association for Psychological Science, addresses enduring questions in bilingual studies about how bilingual speakers hear and process sound in two different languages.
"A lot of research has shown that bilinguals are pretty good at accommodating speech variation across languages, but there's been a debate as to how," said lead author Kalim Gonzales, a psychology doctoral student at the University of Arizona. "There are two views: One is that bilinguals have different processing modes for their two languages -- they have a mode for processing speech in one language and then a mode for processing speech in the other language. Another view is that bilinguals just adjust to speech variation by recalibrating to the unique acoustic properties of each language."
Yitang Zhang Proves 'Landmark' Theorem in Distribution of Prime Numbers
On April 17, a paper arrived in the inbox of Annals of Mathematics, one of the discipline’s preeminent journals. Written by a mathematician virtually unknown to the experts in his field — a 50-something lecturer at the University of New Hampshire named Yitang Zhang — the paper claimed to have taken a huge step forward in understanding one of mathematics’ oldest problems, the twin primes conjecture.
Editors of prominent mathematics journals are used to fielding grandiose claims from obscure authors, but this paper was different. Written with crystalline clarity and a total command of the topic’s current state of the art, it was evidently a serious piece of work, and the Annals editors decided to put it on the fast track.
Editors of prominent mathematics journals are used to fielding grandiose claims from obscure authors, but this paper was different. Written with crystalline clarity and a total command of the topic’s current state of the art, it was evidently a serious piece of work, and the Annals editors decided to put it on the fast track.
Practice makes perfect? Not so much, new research finds
Turns out, that old "practice makes perfect" adage may be overblown. New research led by Michigan State University's Zach Hambrick finds that a copious amount of practice is not enough to explain why people differ in level of skill in two widely studied activities, chess and music.
In other words, it takes more than hard work to become an expert. Hambrick, writing in the research journal Intelligence, said natural talent and other factors likely play a role in mastering a complicated activity.
"Practice is indeed important to reach an elite level of performance, but this paper makes an overwhelming case that it isn't enough," said Hambrick, associate professor of psychology.
The debate over why and how people become experts has existed for more than a century. Many theorists argue that thousands of hours of focused, deliberate practice is sufficient to achieve elite status.
"The evidence is quite clear," he writes, "that some people do reach an elite level of performance without copious practice, while other people fail to do so despite copious practice."
In other words, it takes more than hard work to become an expert. Hambrick, writing in the research journal Intelligence, said natural talent and other factors likely play a role in mastering a complicated activity.
"Practice is indeed important to reach an elite level of performance, but this paper makes an overwhelming case that it isn't enough," said Hambrick, associate professor of psychology.
The debate over why and how people become experts has existed for more than a century. Many theorists argue that thousands of hours of focused, deliberate practice is sufficient to achieve elite status.
"The evidence is quite clear," he writes, "that some people do reach an elite level of performance without copious practice, while other people fail to do so despite copious practice."
May 16, 2013
Tamed fox shows domestication's effects on the brain
Taming foxes changes not only the animals’ behavior but also their brain chemistry, a new study shows.
The finding could shed light on how the foxes’ genetic cousins, wolves, morphed into man’s best friend. Lenore Pipes of Cornell University presented the results May 10 at the Biology of Genomes conference.
The foxes she worked with come from a long line started in 1959 when a Russian scientist named Dmitry Belyaev attempted to recreate dog domestication, but using foxes instead of wolves. He bred silver foxes (Vulpes vulpes), which are actually a type of red fox with white-tipped black fur. Belyaev and his colleagues selected the least aggressive animals they could find at local fox farms and bred them. Each generation, the scientists picked the tamest animals to mate, creating ever friendlier foxes. Now, more than 50 years later, the foxes act like dogs, wagging their tails, jumping with excitement and leaping into the arms of caregivers for caresses.
The finding could shed light on how the foxes’ genetic cousins, wolves, morphed into man’s best friend. Lenore Pipes of Cornell University presented the results May 10 at the Biology of Genomes conference.
The foxes she worked with come from a long line started in 1959 when a Russian scientist named Dmitry Belyaev attempted to recreate dog domestication, but using foxes instead of wolves. He bred silver foxes (Vulpes vulpes), which are actually a type of red fox with white-tipped black fur. Belyaev and his colleagues selected the least aggressive animals they could find at local fox farms and bred them. Each generation, the scientists picked the tamest animals to mate, creating ever friendlier foxes. Now, more than 50 years later, the foxes act like dogs, wagging their tails, jumping with excitement and leaping into the arms of caregivers for caresses.
May 15, 2013
Marijuana users have better blood sugar control
Regular marijuana use is associated with favorable indices related to diabetic control, say investigators. They found that current marijuana users had significantly lower fasting insulin and were less likely to be insulin resistant, even after excluding patients with a diagnosis of diabetes mellitus. Their findings are reported in the current issue of The American Journal of Medicine.
Marijuana (Cannabis sativa) has been used for centuries to relieve pain, improve mood, and increase appetite. Outlawed in the United States in 1937, its social use continues to increase and public opinion is swinging in favor of the medicinal use of marijuana. There are an estimated 17.4 million current users of marijuana in the United States. Approximately 4.6 million of these users smoke marijuana daily or almost daily. A synthetic form of its active ingredient, tetrahydrocannabinol, commonly known as THC, has already been approved to treat side-effects of chemotherapy, AIDS-induced anorexia, nausea, and other medical conditions. With the recent legalization of recreational marijuana in two states and the legalization of medical marijuana in 19 states and the District of Columbia, physicians will increasingly encounter marijuana use among their patient populations.
Marijuana (Cannabis sativa) has been used for centuries to relieve pain, improve mood, and increase appetite. Outlawed in the United States in 1937, its social use continues to increase and public opinion is swinging in favor of the medicinal use of marijuana. There are an estimated 17.4 million current users of marijuana in the United States. Approximately 4.6 million of these users smoke marijuana daily or almost daily. A synthetic form of its active ingredient, tetrahydrocannabinol, commonly known as THC, has already been approved to treat side-effects of chemotherapy, AIDS-induced anorexia, nausea, and other medical conditions. With the recent legalization of recreational marijuana in two states and the legalization of medical marijuana in 19 states and the District of Columbia, physicians will increasingly encounter marijuana use among their patient populations.
May 14, 2013
Study finds brain system for emotional self-control
Different brain areas are activated when we choose for ourselves to suppress an emotion, compared to situations where we are instructed to inhibit an emotion, according a new study from the UCL Institute of Cognitive Neuroscience and Ghent University.
In this study, published in Brain Structure and Function, the researchers scanned the brains of healthy participants and found that key brain systems were activated when choosing for oneself to suppress an emotion. They had previously linked this brain area to deciding to inhibit movement.
“This result shows that emotional self-control involves a quite different brain system from simply being told how to respond emotionally,” said lead author Dr Simone Kuhn (Ghent University).
In most previous studies, participants were instructed to feel or inhibit an emotional response. However, in everyday life we are rarely told to suppress our emotions, and usually have to decide ourselves whether to feel or control our emotions.
In this study, published in Brain Structure and Function, the researchers scanned the brains of healthy participants and found that key brain systems were activated when choosing for oneself to suppress an emotion. They had previously linked this brain area to deciding to inhibit movement.
“This result shows that emotional self-control involves a quite different brain system from simply being told how to respond emotionally,” said lead author Dr Simone Kuhn (Ghent University).
In most previous studies, participants were instructed to feel or inhibit an emotional response. However, in everyday life we are rarely told to suppress our emotions, and usually have to decide ourselves whether to feel or control our emotions.
When deciding how to bet, less detailed information may be better
People are worse at predicting whether a sports team will win, lose, or tie when they bet on the final score than when they bet on the overall outcome, according to a new study published in Psychological Science, a journal of the Association for Psychological Science.
Examining sports betting data from both the real world and the lab, psychological scientist Kwanho Suk and colleagues at Korea University Business School found that people who relied on more detailed information were actually less accurate in their predictions about sports match outcomes.
These results stand in contrast to the conventional wisdom that thoughtful deliberation improves decision-making.
"Our research suggests that predicting results -- at least for sports matches -- in a less deliberate way can actually improve prediction accuracy," explained Suk.
Examining sports betting data from both the real world and the lab, psychological scientist Kwanho Suk and colleagues at Korea University Business School found that people who relied on more detailed information were actually less accurate in their predictions about sports match outcomes.
These results stand in contrast to the conventional wisdom that thoughtful deliberation improves decision-making.
"Our research suggests that predicting results -- at least for sports matches -- in a less deliberate way can actually improve prediction accuracy," explained Suk.
Out of sync: Body clocks altered at cell level in depression
Every cell in our bodies runs on a 24-hour clock, tuned to the night-day, light-dark cycles that have ruled us since the dawn of humanity. The brain acts as timekeeper, keeping the cellular clock in sync with the outside world so that it can govern our appetites, sleep, moods and much more.
But new research shows that the clock may be broken in the brains of people with depression -- even at the level of the gene activity inside their brain cells.
It's the first direct evidence of altered circadian rhythms in the brain of people with depression, and shows that they operate out of sync with the usual ingrained daily cycle. The findings, in the Proceedings of the National Academy of Sciences, come from scientists from the University of Michigan Medical School and other institutions.
The discovery was made by sifting through massive amounts of data gleaned from donated brains of depressed and non-depressed people. With further research, the findings could lead to more precise diagnosis and treatment for a condition that affects more than 350 million people worldwide.
What's more, the research also reveals a previously unknown daily rhythm to the activity of many genes across many areas of the brain -- expanding the sense of how crucial our master clock is.
But new research shows that the clock may be broken in the brains of people with depression -- even at the level of the gene activity inside their brain cells.
It's the first direct evidence of altered circadian rhythms in the brain of people with depression, and shows that they operate out of sync with the usual ingrained daily cycle. The findings, in the Proceedings of the National Academy of Sciences, come from scientists from the University of Michigan Medical School and other institutions.
The discovery was made by sifting through massive amounts of data gleaned from donated brains of depressed and non-depressed people. With further research, the findings could lead to more precise diagnosis and treatment for a condition that affects more than 350 million people worldwide.
What's more, the research also reveals a previously unknown daily rhythm to the activity of many genes across many areas of the brain -- expanding the sense of how crucial our master clock is.
Living close to major road may impair kidney function
The authors base their findings on more than 1100 adults who had sustained a stroke between 1999 and 2004 and had been admitted to hospital in the greater Boston area of Massachusetts in the US.
On admission, each patient's serum creatinine was measured. This is a by-product of muscle metabolism and is filtered out of the body by the kidney, known as the glomerular filtration rate or GFR. The GFR is therefore an indicator of the health of the kidneys and how well they are working.
Half the patients lived within 1 km of a major road, with the rest living between 1 and 10 km away.
After taking account of influential factors, such as age, sex, race, smoking, underlying conditions, treatment for heart conditions, and neighbourhood affluence, those patients who lived closest to a major road had the lowest GFR.
Those who lived 50 metres away had a GFR that was 3.9 ml/minute/1.73 m2 lower than those who lived 1000 metres away. This difference is comparable to a reduction in GFR associated with being 4 years older.
On admission, each patient's serum creatinine was measured. This is a by-product of muscle metabolism and is filtered out of the body by the kidney, known as the glomerular filtration rate or GFR. The GFR is therefore an indicator of the health of the kidneys and how well they are working.
Half the patients lived within 1 km of a major road, with the rest living between 1 and 10 km away.
After taking account of influential factors, such as age, sex, race, smoking, underlying conditions, treatment for heart conditions, and neighbourhood affluence, those patients who lived closest to a major road had the lowest GFR.
Those who lived 50 metres away had a GFR that was 3.9 ml/minute/1.73 m2 lower than those who lived 1000 metres away. This difference is comparable to a reduction in GFR associated with being 4 years older.
Bee Venom Kills HIV: Nanoparticles Carrying Toxin Shown To Destroy Human Immunodeficiency Virus (VIDEO)
A new study has shown that bee venom can kill the human immunodeficiency virus (HIV).
Researchers at Washington University School of Medicine in St. Louis have demonstrated that a toxin called melittin found in bee venom can destroy HIV by poking holes in the envelope surrounding the virus, according to a news release sent out by Washington University.
Visit Washington University's website to read more about the study.
Nanoparticles smaller than HIV were infused with the bee venom toxin, explains U.S. News & World Report. A "protective bumper" was added to the nanoparticle's surface, allowing it to bounce off normal cells and leave them intact. Normal cells are larger than HIV, so the nanoparticles target HIV, which is so small it fits between the bumpers.
Researchers at Washington University School of Medicine in St. Louis have demonstrated that a toxin called melittin found in bee venom can destroy HIV by poking holes in the envelope surrounding the virus, according to a news release sent out by Washington University.
Visit Washington University's website to read more about the study.
Nanoparticles smaller than HIV were infused with the bee venom toxin, explains U.S. News & World Report. A "protective bumper" was added to the nanoparticle's surface, allowing it to bounce off normal cells and leave them intact. Normal cells are larger than HIV, so the nanoparticles target HIV, which is so small it fits between the bumpers.
May 13, 2013
Photonic quantum computers: A brighter future than ever
Harnessing the unique features of the quantum world promises a dramatic speed-up in information processing as compared to the fastest classical machines. Scientists from the Group of Philip Walther from the Faculty of Physics, University of Vienna succeeded in prototyping a new and highly resource efficient model of a quantum computer -- the boson sampling computer.
Quantum computers work by manipulating quantum objects as, for example, individual photons, electrons or atoms and by harnessing the unique quantum features. Not only do quantum computers promise a dramatic increase in speed over classical computers in a variety of computational tasks; they are designed to complete tasks that even a supercomputer would not be able to handle. Although, in recent years, there has been a rapid development in quantum technology the realization of a full-sized quantum computer is still very challenging. While it is still an exciting open question which architecture and quantum objects will finally lead to the outperformance of conventional supercomputers, current experiments show that some quantum objects are better suited than others for particular computational tasks.
Quantum computers work by manipulating quantum objects as, for example, individual photons, electrons or atoms and by harnessing the unique quantum features. Not only do quantum computers promise a dramatic increase in speed over classical computers in a variety of computational tasks; they are designed to complete tasks that even a supercomputer would not be able to handle. Although, in recent years, there has been a rapid development in quantum technology the realization of a full-sized quantum computer is still very challenging. While it is still an exciting open question which architecture and quantum objects will finally lead to the outperformance of conventional supercomputers, current experiments show that some quantum objects are better suited than others for particular computational tasks.
May 9, 2013
The Scientific 7-Minute Workout
An article in the May-June issue of the American College of Sports Medicine’s Health & Fitness Journal does just that. In 12 exercises deploying only body weight, a chair and a wall, it fulfills the latest mandates for high-intensity effort, which essentially combines a long run and a visit to the weight room into about seven minutes of steady discomfort — all of it based on science.
“There’s very good evidence” that high-intensity interval training provides “many of the fitness benefits of prolonged endurance training but in much less time,” says Chris Jordan, the director of exercise physiology at the Human Performance Institute in Orlando, Fla., and co-author of the new article.
“There’s very good evidence” that high-intensity interval training provides “many of the fitness benefits of prolonged endurance training but in much less time,” says Chris Jordan, the director of exercise physiology at the Human Performance Institute in Orlando, Fla., and co-author of the new article.
Could eating peppers prevent Parkinson's? Dietary nicotine may hold protective key
New research reveals that Solanaceae -- a flowering plant family with some species producing foods that are edible sources of nicotine -- may provide a protective effect against Parkinson's disease. The study appearing today in Annals of Neurology, a journal of the American Neurological Association and Child Neurology Society, suggests that eating foods that contain even a small amount of nicotine, such as peppers and tomatoes, may reduce risk of developing Parkinson's.
Parkinson's disease is a movement disorder caused by a loss of brain cells that produce dopamine. Symptoms include facial, hand, arm, and leg tremors, stiffness in the limbs, loss of balance, and slower overall movement. Nearly one million Americans have Parkinson's, with 60,000 new cases diagnosed in the U.S. each year, and up to ten million individuals worldwide live with this disease according to the Parkinson's Disease Foundation. Currently, there is no cure for Parkinson's, but symptoms are treated with medications and procedures such as deep brain stimulation.
Previous studies have found that cigarette smoking and other forms of tobacco, also a Solanaceae plant, reduced relative risk of Parkinson's disease. However, experts have not confirmed if nicotine or other components in tobacco provide a protective effect, or if people who develop Parkinson's disease are simply less apt to use tobacco because of differences in the brain that occur early in the disease process, long before diagnosis.
Parkinson's disease is a movement disorder caused by a loss of brain cells that produce dopamine. Symptoms include facial, hand, arm, and leg tremors, stiffness in the limbs, loss of balance, and slower overall movement. Nearly one million Americans have Parkinson's, with 60,000 new cases diagnosed in the U.S. each year, and up to ten million individuals worldwide live with this disease according to the Parkinson's Disease Foundation. Currently, there is no cure for Parkinson's, but symptoms are treated with medications and procedures such as deep brain stimulation.
Previous studies have found that cigarette smoking and other forms of tobacco, also a Solanaceae plant, reduced relative risk of Parkinson's disease. However, experts have not confirmed if nicotine or other components in tobacco provide a protective effect, or if people who develop Parkinson's disease are simply less apt to use tobacco because of differences in the brain that occur early in the disease process, long before diagnosis.
May 8, 2013
Sunshine could benefit health and prolong life, study suggests
Exposing skin to sunlight may help to reduce blood pressure, cut the risk of heart attack and stroke - and even prolong life, a study suggests.
Researchers have shown that when our skin is exposed to the sun's rays, a compound is released in our blood vessels that helps lower blood pressure.
The findings suggest that exposure to sunlight improves health overall, because the benefits of reducing blood pressure far outweigh the risk of developing skin cancer.
The study has been carried out by the University of Edinburgh.
Heart disease and stroke linked to high blood pressure are estimated to lead to around 80 times more deaths than those from skin cancer, in the UK.
Production of this pressure-reducing compound - called nitric oxide - is separate from the body's manufacture of vitamin D, which rises after exposure to sunshine. Until now it had been thought to solely explain the sun's benefit to human health, the scientists add.
Researchers have shown that when our skin is exposed to the sun's rays, a compound is released in our blood vessels that helps lower blood pressure.
The findings suggest that exposure to sunlight improves health overall, because the benefits of reducing blood pressure far outweigh the risk of developing skin cancer.
The study has been carried out by the University of Edinburgh.
Heart disease and stroke linked to high blood pressure are estimated to lead to around 80 times more deaths than those from skin cancer, in the UK.
Production of this pressure-reducing compound - called nitric oxide - is separate from the body's manufacture of vitamin D, which rises after exposure to sunshine. Until now it had been thought to solely explain the sun's benefit to human health, the scientists add.
U.S. urban trees store carbon, provide billions in economic value, finds state-by-state analysis
From New York City's Central Park to Golden Gate Park in San Francisco, America's urban forests store an estimated 708 million tons of carbon, an environmental service with an estimated value of $50 billion, according to a recent U.S. Forest Service study.
Annual net carbon uptake by these trees is estimated at 21 million tons and $1.5 billion in economic benefit.
In the study published recently in the journal Environmental Pollution, Dave Nowak, a research forester with the U.S. Forest Service's Northern Research Station, and his colleagues used urban tree field data from 28 cities and six states and national tree cover data to estimate total carbon storage in the nation's urban areas.
"With expanding urbanization, city trees and forests are becoming increasingly important to sustain the health and well-being of our environment and our communities," said U.S. Forest Service Chief Tom Tidwell. "Carbon storage is just one of the many benefits provided by the hardest working trees in America. I hope this study will encourage people to look at their neighborhood trees a little differently, and start thinking about ways they can help care for their own urban forests."
Annual net carbon uptake by these trees is estimated at 21 million tons and $1.5 billion in economic benefit.
In the study published recently in the journal Environmental Pollution, Dave Nowak, a research forester with the U.S. Forest Service's Northern Research Station, and his colleagues used urban tree field data from 28 cities and six states and national tree cover data to estimate total carbon storage in the nation's urban areas.
"With expanding urbanization, city trees and forests are becoming increasingly important to sustain the health and well-being of our environment and our communities," said U.S. Forest Service Chief Tom Tidwell. "Carbon storage is just one of the many benefits provided by the hardest working trees in America. I hope this study will encourage people to look at their neighborhood trees a little differently, and start thinking about ways they can help care for their own urban forests."
May 7, 2013
Plants 'talk' to plants to help them grow
Having a neighborly chat improves seed germination, finds research in BioMed Central's open access journal BMC Ecology. Even when other known means of communication, such as contact, chemical and light-mediated signals, are blocked, chilli seeds grow better when grown with basil plants. This suggests that plants are talking via nanomechanical vibrations.
Monica Gagliano and Michael Renton from the University of Western Australia attempted to grow chilli seeds (Capsicum annuum) in the presence or absence of other chilli plants, or basil (Ocimum basilicum). In the absence of a neighboring plant, germination rates were very low, but when the plants were able to openly communicate with the seeds more seedlings grew.
However when the seeds were separated from the basil plants with black plastic, so that they could not be influenced by either light or chemical signals, they germinated as though they could still communicate with the basil. A partial response was seen for fully grown chilli plants blocked from known communication with the seeds.
Dr Gagliano explained, "Our results show that plants are able to positively influence growth of seeds by some as yet unknown mechanism. Bad neighbors, such as fennel, prevent chilli seed germination in the same way. We believe that the answer may involve acoustic signals generated using nanomechanical oscillations from inside the cell which allow rapid communication between nearby plants."
Monica Gagliano and Michael Renton from the University of Western Australia attempted to grow chilli seeds (Capsicum annuum) in the presence or absence of other chilli plants, or basil (Ocimum basilicum). In the absence of a neighboring plant, germination rates were very low, but when the plants were able to openly communicate with the seeds more seedlings grew.
However when the seeds were separated from the basil plants with black plastic, so that they could not be influenced by either light or chemical signals, they germinated as though they could still communicate with the basil. A partial response was seen for fully grown chilli plants blocked from known communication with the seeds.
Dr Gagliano explained, "Our results show that plants are able to positively influence growth of seeds by some as yet unknown mechanism. Bad neighbors, such as fennel, prevent chilli seed germination in the same way. We believe that the answer may involve acoustic signals generated using nanomechanical oscillations from inside the cell which allow rapid communication between nearby plants."
Anti-depressant link to Clostridium difficile infection
Certain types of anti-depressants have been linked to an increase in the risk of Clostridium difficile infection (CDI) finds a study in BioMed Central's open access journal BMC Medicine. Awareness of this link should improve identification and early treatment of CDI.
CDI is one of the most common hospital acquired infections and is responsible for more than 7000 deaths annually in the USA alone. Several types of medications are thought to increase risk of CDI, including anti-depressants, and given that depression is the third most common medical condition worldwide a team from the University of Michigan investigated the exact nature of this risk.
Firstly the team studied Clostridium difficile infection in people with and without depression and found that people with major depression had a much higher chance of CDI (a 36% increase) than people without depression. This association held for a variety of depressive disorders and nervous or psychiatric problems. Age and family support also impacted risk of CDI. Older, widowed Americans were 54% more likely to catch C. difficile than their married peers. Just living alone increased risk by 25%.
Secondly they looked to see if there was an association between antidepressant medication and hospital acquired CDI. They found that use of most types of antidepressants did not affect CDI risk -- out of the twelve drugs tested only mirtazapine and fluoxetine increased risk of CDI, in each case the risk was doubled.
CDI is one of the most common hospital acquired infections and is responsible for more than 7000 deaths annually in the USA alone. Several types of medications are thought to increase risk of CDI, including anti-depressants, and given that depression is the third most common medical condition worldwide a team from the University of Michigan investigated the exact nature of this risk.
Firstly the team studied Clostridium difficile infection in people with and without depression and found that people with major depression had a much higher chance of CDI (a 36% increase) than people without depression. This association held for a variety of depressive disorders and nervous or psychiatric problems. Age and family support also impacted risk of CDI. Older, widowed Americans were 54% more likely to catch C. difficile than their married peers. Just living alone increased risk by 25%.
Secondly they looked to see if there was an association between antidepressant medication and hospital acquired CDI. They found that use of most types of antidepressants did not affect CDI risk -- out of the twelve drugs tested only mirtazapine and fluoxetine increased risk of CDI, in each case the risk was doubled.
Live and learn: Most GenXers continue their education
More than one in every 10 members of Generation X are enrolled in classes to continue their formal educations, according to a new University of Michigan study released today. In addition, 48 percent of GenXers take continuing education courses, in-service training, and workshops required for professional licenses and certifications.
"This is an impressive level of engagement in lifelong learning," says Jon D. Miller, author of the latest issue of The Generation X Report. "It reflects the changing realities of a global economy, driven by science and technology.
Projected to the 80 million young adults in Generation X, Miller says the findings suggest that 1.8 million young adults are studying to earn associate degrees, 1.7 million are seeking baccalaureates, and nearly 2 million are taking courses to earn advanced degrees at the masters, doctoral, or professional level.
According to Miller, slightly more than 40 percent of GenXers have earned a baccalaureate or higher degree, with those living in cities or suburbs more likely to have a degree than those living in small towns or rural areas.
The study also found that GenXers have earned graduate and professional degrees at a higher rate than any previous generation. By 2011, two decades after finishing high school, 22 percent of those surveyed had completed at least one advanced degree, and 10 percent had completed a doctorate or professional degree.
"This is an impressive level of engagement in lifelong learning," says Jon D. Miller, author of the latest issue of The Generation X Report. "It reflects the changing realities of a global economy, driven by science and technology.
Projected to the 80 million young adults in Generation X, Miller says the findings suggest that 1.8 million young adults are studying to earn associate degrees, 1.7 million are seeking baccalaureates, and nearly 2 million are taking courses to earn advanced degrees at the masters, doctoral, or professional level.
According to Miller, slightly more than 40 percent of GenXers have earned a baccalaureate or higher degree, with those living in cities or suburbs more likely to have a degree than those living in small towns or rural areas.
The study also found that GenXers have earned graduate and professional degrees at a higher rate than any previous generation. By 2011, two decades after finishing high school, 22 percent of those surveyed had completed at least one advanced degree, and 10 percent had completed a doctorate or professional degree.
May 2, 2013
New brain research shows two parents may be better than one
A team of researchers at the University of Calgary's Hotchkiss Brain Institute (HBI) have discovered that adult brain cell production might be determined, in part, by the early parental environment. The study suggests that dual parenting may be more beneficial than single parenting.
Scientists studied mouse pups that were raised by either dual or single parents and found that adult cell production in the brain might be triggered by early life experiences. The scientists also found that the increased adult brain cell production varied based on gender. Specifically, female pups raised by two parents had enhanced white matter production as adults, increasing motor coordination and sociability. Male pups raised by dual parents displayed more grey matter production as an adult, which improves learning and memory.
"Our new work adds to a growing body of knowledge, which indicates that early, supportive experiences have long lasting, positive impact on adult brain function," says Samuel Weiss, PhD, senior author of the study and director of the HBI.
Surprisingly, the advantages of dual parenting were also passed along when these two groups reproduced, even if their offspring were raised by one female. The advantages of dual parenting were thus passed along to the next generation.
Scientists studied mouse pups that were raised by either dual or single parents and found that adult cell production in the brain might be triggered by early life experiences. The scientists also found that the increased adult brain cell production varied based on gender. Specifically, female pups raised by two parents had enhanced white matter production as adults, increasing motor coordination and sociability. Male pups raised by dual parents displayed more grey matter production as an adult, which improves learning and memory.
"Our new work adds to a growing body of knowledge, which indicates that early, supportive experiences have long lasting, positive impact on adult brain function," says Samuel Weiss, PhD, senior author of the study and director of the HBI.
Surprisingly, the advantages of dual parenting were also passed along when these two groups reproduced, even if their offspring were raised by one female. The advantages of dual parenting were thus passed along to the next generation.
Bigger birth weight babies at greater risk of autism
The biggest study of fetal growth and autism to date has reported that babies whose growth is at either extreme in the womb, either very big or very small, are at greater risk of developing autism.
It is the first time that a clear link has been made between babies who grow to above average size at birth and risk of Autism Spectrum Disorder and follows from a study of more than 40,000 child health records in Sweden.
The research, led by The University of Manchester, also confirms earlier research which reported that premature and poorly grown, low weight babies appear more susceptible to the condition.
Autism affects how individuals interact with the world and with other people and there is no known cure. One child in 100 has the condition in the UK according to NHS figures. Researchers believe it has origins in both genetic and environmental causes. Professor Kathryn Abel, from the University's Centre for Women's Mental Health and Institute of Brain, Behaviour and Mental Health, led the research published in The American Journal of Psychiatry.
It is the first time that a clear link has been made between babies who grow to above average size at birth and risk of Autism Spectrum Disorder and follows from a study of more than 40,000 child health records in Sweden.
The research, led by The University of Manchester, also confirms earlier research which reported that premature and poorly grown, low weight babies appear more susceptible to the condition.
Autism affects how individuals interact with the world and with other people and there is no known cure. One child in 100 has the condition in the UK according to NHS figures. Researchers believe it has origins in both genetic and environmental causes. Professor Kathryn Abel, from the University's Centre for Women's Mental Health and Institute of Brain, Behaviour and Mental Health, led the research published in The American Journal of Psychiatry.
April 25, 2013
Psychopaths are not neurally equipped to have concern for others
Prisoners who are psychopaths lack the basic neurophysiological "hardwiring" that enables them to care for others, according to a new study by neuroscientists at the University of Chicago and the University of New Mexico.
"A marked lack of empathy is a hallmark characteristic of individuals with psychopathy," said the lead author of the study, Jean Decety, the Irving B. Harris Professor in Psychology and Psychiatry at UChicago. Psychopathy affects approximately 1 percent of the United States general population and 20 percent to 30 percent of the male and female U.S. prison population. Relative to non-psychopathic criminals, psychopaths are responsible for a disproportionate amount of repetitive crime and violence in society.
"A marked lack of empathy is a hallmark characteristic of individuals with psychopathy," said the lead author of the study, Jean Decety, the Irving B. Harris Professor in Psychology and Psychiatry at UChicago. Psychopathy affects approximately 1 percent of the United States general population and 20 percent to 30 percent of the male and female U.S. prison population. Relative to non-psychopathic criminals, psychopaths are responsible for a disproportionate amount of repetitive crime and violence in society.
High-volume Bitcoin exchanges less likely to fail, but more likely breached, says study
As of April 2013, Bitcoin's market capitalization had soared to more than $1 billion, making it a frequent target of fraudsters. Bitcoins are encrypted virtual money created by computer programmers and not backed by any country or government.
A traceable form of cyber money, Bitcoins can be purchased and used much like hard currency to pay for goods and services, mostly over the Internet. Part of Bitcoins' attraction is its potential to reduce transaction fees for online purchases, as well as its mathematically-enforced protections against inflation.
Study authors Moore and Christin identified 40 Bitcoin exchanges worldwide that convert the cyber money into 33 hard currencies. Of those 40, 18 have gone out of business. Nine of the 40 experienced security breaches from hackers or other criminal activity, forcing five of them to subsequently close. Another 13 closed without any publicly announced breach, according to Moore and Christin.
From their study, the researchers found the failure rate of Bitcoin exchanges is 45 percent. The median lifetime of an exchange is just over one year, 381 days.
Of the 18 Bitcoin exchanges that closed, in 11 of those cases the authors were able to find evidence of whether or not the customers were reimbursed their money. Five exchanges didn't reimburse their customers. Six claim to have done so.
"The risk of losing funds stored at exchanges is real but uncertain," write Moore and Christin in "Beware the Middleman: Empirical Analysis of Bitcoin-Exchange Risk," which was invited for presentation at the 17th International Financial Cryptography and Data Security Conference held in Okinawa, Japan, April 1-5.
A traceable form of cyber money, Bitcoins can be purchased and used much like hard currency to pay for goods and services, mostly over the Internet. Part of Bitcoins' attraction is its potential to reduce transaction fees for online purchases, as well as its mathematically-enforced protections against inflation.
Study authors Moore and Christin identified 40 Bitcoin exchanges worldwide that convert the cyber money into 33 hard currencies. Of those 40, 18 have gone out of business. Nine of the 40 experienced security breaches from hackers or other criminal activity, forcing five of them to subsequently close. Another 13 closed without any publicly announced breach, according to Moore and Christin.
From their study, the researchers found the failure rate of Bitcoin exchanges is 45 percent. The median lifetime of an exchange is just over one year, 381 days.
Of the 18 Bitcoin exchanges that closed, in 11 of those cases the authors were able to find evidence of whether or not the customers were reimbursed their money. Five exchanges didn't reimburse their customers. Six claim to have done so.
"The risk of losing funds stored at exchanges is real but uncertain," write Moore and Christin in "Beware the Middleman: Empirical Analysis of Bitcoin-Exchange Risk," which was invited for presentation at the 17th International Financial Cryptography and Data Security Conference held in Okinawa, Japan, April 1-5.
Facebook interests could help predict, track and map obesity
The higher the percentage of people in a city, town or neighborhood with Facebook interests suggesting a healthy, active lifestyle, the lower that area's obesity rate. At the same time, areas with a large percentage of Facebook users with television-related interests tend to have higher rates of obesity. Such are the conclusions of a study by Boston Children's Hospital researchers comparing geotagged Facebook user data with data from national and New York City-focused health surveys.
Together, the conclusions suggest that knowledge of people's online interests within geographic areas may help public health researchers predict, track and map obesity rates down to the neighborhood level, while offering an opportunity to design geotargeted online interventions aimed at reducing obesity rates.
Together, the conclusions suggest that knowledge of people's online interests within geographic areas may help public health researchers predict, track and map obesity rates down to the neighborhood level, while offering an opportunity to design geotargeted online interventions aimed at reducing obesity rates.
Clenching fists 'can improve memory'
Memory can be improved simply by clenching the fists, a study suggests.
Clenching the right hand for 90 seconds helps in memory formation, while the same movement in the left improves memory recall, say US psychologists.
In an experiment, 50 adults performed better at remembering words from a long list when they carried out these movements.
The researchers think clenching a fist activates specific brain regions that are associated with memory processing.
Lead scientist Ruth Propper, of Montclair State University, Montclair, New Jersey, said the research suggests simple body movements can improve memory by temporarily changing the way the brain functions.
"Clenching your right hand immediately prior to learning information and clenching your left hand immediately before recalling it would be helpful to improve memory," Dr Propper told BBC News.
Clenching the right hand for 90 seconds helps in memory formation, while the same movement in the left improves memory recall, say US psychologists.
In an experiment, 50 adults performed better at remembering words from a long list when they carried out these movements.
The researchers think clenching a fist activates specific brain regions that are associated with memory processing.
Lead scientist Ruth Propper, of Montclair State University, Montclair, New Jersey, said the research suggests simple body movements can improve memory by temporarily changing the way the brain functions.
"Clenching your right hand immediately prior to learning information and clenching your left hand immediately before recalling it would be helpful to improve memory," Dr Propper told BBC News.
High performance semiconductor spray paint could be a game changer for organic electronics
Researchers at Wake Forest University's Organic Electronics group have come up with a novel solution to one of the biggest technological barriers facing the organic semiconductor industry today. Oana Jurchescu, an assistant professor of physics, and a team of researchers developed a high performance organic semiconductor 'spray paint' that can be applied to large surface areas without losing electric conductivity. This is a potentially game changing technology for a number of reasons.
Organic thin film transistors are currently deposited by one of three methods. Drop casting and spin coating conduct electricity well but are limited to small area applications. They could not be used to make a wall-sized, flexible video screen for instance. On the other hand, organic spray-on techniques can be applied to large areas but have poor performance when compared to their small-area counterparts.
Jurchescu's work provides the best of both worlds. The spray-deposition technology developed in her lab produced the highest performance organic thin film transistors for this method to date -- (April 2, 2013) -- comparable to those of drop casting and spin coating. Unlike drop casting and spin coating, her spray-deposition technology can be applied over large surfaces to any medium-from plastic and metal to human skin.
Organic thin film transistors are currently deposited by one of three methods. Drop casting and spin coating conduct electricity well but are limited to small area applications. They could not be used to make a wall-sized, flexible video screen for instance. On the other hand, organic spray-on techniques can be applied to large areas but have poor performance when compared to their small-area counterparts.
Jurchescu's work provides the best of both worlds. The spray-deposition technology developed in her lab produced the highest performance organic thin film transistors for this method to date -- (April 2, 2013) -- comparable to those of drop casting and spin coating. Unlike drop casting and spin coating, her spray-deposition technology can be applied over large surfaces to any medium-from plastic and metal to human skin.
April 18, 2013
Famous performers and sportsmen tend to have shorter lives
Fame and achievement in performance-related careers may be earned at the cost of a shorter life, according to a study published online today in QJM: An International Journal of Medicine.
Based on the premise that an obituary in the New York Times (NYT) usually implies success in one's career, Professor Richard Epstein and Catherine Epstein analysed 1000 consecutive obituaries published in the NYT during 2009-2011 in terms of gender, age, occupation, and cause of death. They separated subjects into four broad occupational categories: performance/sport (including actors, singers, musicians, dancers, and sportspeople), non-performing creative (including writers, composers and visual artists), business/military/political, and professional/academic/religious.
Based on the premise that an obituary in the New York Times (NYT) usually implies success in one's career, Professor Richard Epstein and Catherine Epstein analysed 1000 consecutive obituaries published in the NYT during 2009-2011 in terms of gender, age, occupation, and cause of death. They separated subjects into four broad occupational categories: performance/sport (including actors, singers, musicians, dancers, and sportspeople), non-performing creative (including writers, composers and visual artists), business/military/political, and professional/academic/religious.
Researchers abuzz over caffeine as 'cancer-cell killer'
Researchers from the University of Alberta are abuzz after using fruit flies to find new ways of taking advantage of caffeine's lethal effects on cancer cells -- results that could one day be used to advance cancer therapies for people.
Previous research has established that caffeine interferes with processes in cancer cells that control DNA repair, a finding that has generated interest in using the stimulant as a chemotherapy treatment. But given the toxic nature of caffeine at high doses, researchers from the faculties of medicine and dentistry and science instead opted to use it to identify genes and pathways responsible for DNA repair.
"The problem in using caffeine directly is that the levels you would need to completely inhibit the pathway involved in this DNA repair process would kill you," said Shelagh Campbell, co-principal investigator. "We've come at it from a different angle to find ways to take advantage of this caffeine sensitivity."
Previous research has established that caffeine interferes with processes in cancer cells that control DNA repair, a finding that has generated interest in using the stimulant as a chemotherapy treatment. But given the toxic nature of caffeine at high doses, researchers from the faculties of medicine and dentistry and science instead opted to use it to identify genes and pathways responsible for DNA repair.
"The problem in using caffeine directly is that the levels you would need to completely inhibit the pathway involved in this DNA repair process would kill you," said Shelagh Campbell, co-principal investigator. "We've come at it from a different angle to find ways to take advantage of this caffeine sensitivity."
Increased brain activity predicts future onset of substance use
Do people get caught in the cycle of overeating and drug addiction because their brain reward centers are over-active, causing them to experience greater cravings for food or drugs?
In a unique prospective study Oregon Research Institute (ORI) senior scientist Eric Stice, Ph.D., and colleagues tested this theory, called the reward surfeit model. The results indicated that elevated responsivity of reward regions in the brain increased the risk for future substance use, which has never been tested before prospectively with humans. Paradoxically, results also provide evidence that even a limited history of substance use was related to less responsivity in the reward circuitry, as has been suggested by experiments with animals.
In a novel study using functional Magnetic Resonance Imaging (fMRI) Stice's team tested whether individual differences in reward region responsivity predicted overweight/obesity onset among initially healthy weight adolescents and substance use onset among initially abstinent adolescents. The neural response to food and monetary reward was measured in 162 adolescents. Body fat and substance use were assessed at the time of the fMRI and again one year later.
In a unique prospective study Oregon Research Institute (ORI) senior scientist Eric Stice, Ph.D., and colleagues tested this theory, called the reward surfeit model. The results indicated that elevated responsivity of reward regions in the brain increased the risk for future substance use, which has never been tested before prospectively with humans. Paradoxically, results also provide evidence that even a limited history of substance use was related to less responsivity in the reward circuitry, as has been suggested by experiments with animals.
In a novel study using functional Magnetic Resonance Imaging (fMRI) Stice's team tested whether individual differences in reward region responsivity predicted overweight/obesity onset among initially healthy weight adolescents and substance use onset among initially abstinent adolescents. The neural response to food and monetary reward was measured in 162 adolescents. Body fat and substance use were assessed at the time of the fMRI and again one year later.
April 17, 2013
Harms of harsh discipline are softened by a loving mother
The use of harsh discipline of unwanted behaviour in children has long been controversial. Whether verbal (insults, disparaging remarks, threats) or physical (slapping/spanking), harsh discipline at all stages of childhood carries a large risk of manifesting antisocial 'externalising behaviours' in the child, including aggression, delinquency or hyperactivity.
But a new study published in the journal Parenting: Science and Practice suggests that these painful effects of harsh discipline can be moderated by the child's feelings of being loved by their mother.
The study, conducted among a group of Mexican-American adolescents by Dr Miguelina Germán of the Albert Einstein College of Medicine in New York, found that having a loving mother (or 'perception of maternal warmth') protected the youngster from externalizing problems to the extent that, at high levels of maternal warmth, harsh discipline was found to have no correlation with antisocial behaviour.
Where the child's perception of maternal warmth was lower, it still resulted in a positive relationship between harsh disciplinary practices and later externalising problems.
This would suggest that, as long as the child knows they're loved, and feels that it is coming from a good place, their experiences of being strictly disciplined is unlikely to result in antisocial behaviour further down the line.
But a new study published in the journal Parenting: Science and Practice suggests that these painful effects of harsh discipline can be moderated by the child's feelings of being loved by their mother.
The study, conducted among a group of Mexican-American adolescents by Dr Miguelina Germán of the Albert Einstein College of Medicine in New York, found that having a loving mother (or 'perception of maternal warmth') protected the youngster from externalizing problems to the extent that, at high levels of maternal warmth, harsh discipline was found to have no correlation with antisocial behaviour.
Where the child's perception of maternal warmth was lower, it still resulted in a positive relationship between harsh disciplinary practices and later externalising problems.
This would suggest that, as long as the child knows they're loved, and feels that it is coming from a good place, their experiences of being strictly disciplined is unlikely to result in antisocial behaviour further down the line.
Quantum computing taps nucleus of single atom
A team of Australian engineers at the University of New South Wales (UNSW) has demonstrated a quantum bit based on the nucleus of a single atom in silicon, promising dramatic improvements for data processing in ultra-powerful quantum computers of the future.
Quantum bits, or qubits, are the building blocks of quantum computers, which will offer enormous advantages for searching expansive databases, cracking modern encryption, and modelling atomic-scale systems such as biological molecules and drugs.
The world-first result, to be published in Nature on April 18, brings these machines one-step closer, describing how information was stored and retrieved using the magnetic spin of a nucleus.
"We have adapted magnetic resonance technology, commonly known for its application in chemical analysis and MRI scans, to control and read-out the nuclear spin of a single atom in real time," says Associate Professor Andrea Morello from the School of Electrical Engineering and Telecommunications at UNSW.
Quantum bits, or qubits, are the building blocks of quantum computers, which will offer enormous advantages for searching expansive databases, cracking modern encryption, and modelling atomic-scale systems such as biological molecules and drugs.
The world-first result, to be published in Nature on April 18, brings these machines one-step closer, describing how information was stored and retrieved using the magnetic spin of a nucleus.
"We have adapted magnetic resonance technology, commonly known for its application in chemical analysis and MRI scans, to control and read-out the nuclear spin of a single atom in real time," says Associate Professor Andrea Morello from the School of Electrical Engineering and Telecommunications at UNSW.
Big Bang Didn't Need God, Stephen Hawking Says
Our universe didn't need any divine help to burst into being, famed cosmologist Stephen Hawking told a packed house here at the California Institute of Technology Tuesday night (April 16).
Many people had begun queuing up for free tickets to Hawking's 8:00 p.m lecture, titled "The Origin of the Universe," 12 hours earlier. By 6:00 p.m. local time, the line was about a quarter-mile long.
A second auditorium and a Jumbotron-equipped lawn, which itself was jammed with an estimated 1,000 viewers, were needed to handle the overflow crowd. At least one person was observed offering $1,000 for a ticket, with no success. [Big Bang to Now in 10 Easy Steps]
Stephen Hawking began the event by reciting an African creation myth, and rapidly moved on to big questions such as, Why are we here?
He noted that many people still seek a divine solution to counter the theories of curious physicists, and at one point, he quipped, “What was God doing before the divine creation? Was he preparing hell for people who asked such questions?”
Many people had begun queuing up for free tickets to Hawking's 8:00 p.m lecture, titled "The Origin of the Universe," 12 hours earlier. By 6:00 p.m. local time, the line was about a quarter-mile long.
A second auditorium and a Jumbotron-equipped lawn, which itself was jammed with an estimated 1,000 viewers, were needed to handle the overflow crowd. At least one person was observed offering $1,000 for a ticket, with no success. [Big Bang to Now in 10 Easy Steps]
Stephen Hawking began the event by reciting an African creation myth, and rapidly moved on to big questions such as, Why are we here?
He noted that many people still seek a divine solution to counter the theories of curious physicists, and at one point, he quipped, “What was God doing before the divine creation? Was he preparing hell for people who asked such questions?”
Scientists produce best image yet of atoms moving in real time
Call it the ultimate nature documentary. Scientists at the University of Toronto have recorded atomic motions in real time, offering a glimpse into the very essence of chemistry and biology at the atomic level.
Their recording is a direct observation of a transition state in which atoms undergo chemical transformation into new structures with new properties -- in this case the transfer of charge leading to metallic behaviour in organic molecules. It is described in a study reported in the April 18 issue of Nature.
"It's the first look at how chemistry and biology involve just a few key motions for even the most complex systems," says U of T chemistry and physics professor R. J. Dwayne Miller, principal investigator of the study. "There is an enormous reduction in complexity at the defining point, the transition state region, which makes chemical processes transferrable from one type of molecule to another. This is how new drugs or materials are made."
Their recording is a direct observation of a transition state in which atoms undergo chemical transformation into new structures with new properties -- in this case the transfer of charge leading to metallic behaviour in organic molecules. It is described in a study reported in the April 18 issue of Nature.
"It's the first look at how chemistry and biology involve just a few key motions for even the most complex systems," says U of T chemistry and physics professor R. J. Dwayne Miller, principal investigator of the study. "There is an enormous reduction in complexity at the defining point, the transition state region, which makes chemical processes transferrable from one type of molecule to another. This is how new drugs or materials are made."
'Survival of the fittest' now applies to computers: Surprising similarities found between genetic and computer codes
"Survival of the fittest" originally referred to natural selection in biological systems, but new research from Brookhaven National Laboratory and Stony Brook University scientists shows that this evolutionary theory also applies to technological systems.
Computational biologist Sergei Maslov, a research staff member in Brookhaven National Laboratory (BNL), holding appointments with Stony Brook University's Department of Physics and Astronomy and Laufer Center for Physical and Quantitative Biology, worked with Tin Yau Pang, a graduate student in the Department of Physics and Astronomy at Stony Brook, to compare the frequency with which components "survive" in two complex systems: bacterial genomes and operating systems on Linux computers. Their work, "Universal distribution of component frequencies in biological and technological systems," was published in the April 9 edition of Proceedings of the National Academy of Sciences. Dr. Maslov, who received his PhD in Physics from Stony Brook in 1996, discussed the discovery on NPR's Marketplace Tech.
Maslov and Pang set out to determine not only why some specialized genes or computer programs are very common while others are fairly rare, but to see how many components in any system are so important that they can't be eliminated.
"If a bacteria genome doesn't have a particular gene, it will be dead on arrival," Maslov said. "How many of those genes are there? The same goes for large software systems. They have multiple components that work together and the systems require just the right components working together to thrive.'"
Computational biologist Sergei Maslov, a research staff member in Brookhaven National Laboratory (BNL), holding appointments with Stony Brook University's Department of Physics and Astronomy and Laufer Center for Physical and Quantitative Biology, worked with Tin Yau Pang, a graduate student in the Department of Physics and Astronomy at Stony Brook, to compare the frequency with which components "survive" in two complex systems: bacterial genomes and operating systems on Linux computers. Their work, "Universal distribution of component frequencies in biological and technological systems," was published in the April 9 edition of Proceedings of the National Academy of Sciences. Dr. Maslov, who received his PhD in Physics from Stony Brook in 1996, discussed the discovery on NPR's Marketplace Tech.
Maslov and Pang set out to determine not only why some specialized genes or computer programs are very common while others are fairly rare, but to see how many components in any system are so important that they can't be eliminated.
"If a bacteria genome doesn't have a particular gene, it will be dead on arrival," Maslov said. "How many of those genes are there? The same goes for large software systems. They have multiple components that work together and the systems require just the right components working together to thrive.'"
Acute stress primes brain for better cognitive and mental performance
Overworked and stressed out? Look on the bright side. Some stress is good for you.
"You always think about stress as a really bad thing, but it's not," said Daniela Kaufer, associate professor of integrative biology at the University of California, Berkeley. "Some amounts of stress are good to push you just to the level of optimal alertness, behavioral and cognitive performance."
New research by Kaufer and UC Berkeley post-doctoral fellow Elizabeth Kirby has uncovered exactly how acute stress -- short-lived, not chronic -- primes the brain for improved performance.
In studies on rats, they found that significant, but brief stressful events caused stem cells in their brains to proliferate into new nerve cells that, when mature two weeks later, improved the rats' mental performance.
"I think intermittent stressful events are probably what keeps the brain more alert, and you perform better when you are alert," she said.
"You always think about stress as a really bad thing, but it's not," said Daniela Kaufer, associate professor of integrative biology at the University of California, Berkeley. "Some amounts of stress are good to push you just to the level of optimal alertness, behavioral and cognitive performance."
New research by Kaufer and UC Berkeley post-doctoral fellow Elizabeth Kirby has uncovered exactly how acute stress -- short-lived, not chronic -- primes the brain for improved performance.
In studies on rats, they found that significant, but brief stressful events caused stem cells in their brains to proliferate into new nerve cells that, when mature two weeks later, improved the rats' mental performance.
"I think intermittent stressful events are probably what keeps the brain more alert, and you perform better when you are alert," she said.
Parents tend to share more bacteria with family dogs than children
As much as dog owners love their children, they tend to share more of themselves, at least in terms of bacteria, with their canine cohorts rather than their kids.
That is just one finding of a new study led by the University of Colorado Boulder that looked at the types and transfer modes of microbes from the guts, tongues, foreheads and palms (or paws) of members of 60 American families, including canines. Identifying how such bacterial communities can be affected by environmental exposure may help scientists better understand how they can be manipulated to prevent or treat disease, say CU-Boulder Associate Professor Rob Knight and CU-Boulder doctoral student Se Jin Song, the study leaders.
Knight and his team sampled 159 people and 36 dogs. Seventeen of the 60 families had children at home ranging in age from 6 months to 18 years, 17 families had one or more dogs and no children, eight families had both children and dogs and 18 families had neither children nor dogs. Each family consisted of at least one couple between the ages of 26 and 87, and all of the children in the study were biologically related to the couples in the study.
That is just one finding of a new study led by the University of Colorado Boulder that looked at the types and transfer modes of microbes from the guts, tongues, foreheads and palms (or paws) of members of 60 American families, including canines. Identifying how such bacterial communities can be affected by environmental exposure may help scientists better understand how they can be manipulated to prevent or treat disease, say CU-Boulder Associate Professor Rob Knight and CU-Boulder doctoral student Se Jin Song, the study leaders.
Knight and his team sampled 159 people and 36 dogs. Seventeen of the 60 families had children at home ranging in age from 6 months to 18 years, 17 families had one or more dogs and no children, eight families had both children and dogs and 18 families had neither children nor dogs. Each family consisted of at least one couple between the ages of 26 and 87, and all of the children in the study were biologically related to the couples in the study.
April 16, 2013
Small in size, big on power: New microbatteries the most powerful yet
Though they be but little, they are fierce. The most powerful batteries on the planet are only a few millimeters in size, yet they pack such a punch that a driver could use a cellphone powered by these batteries to jump-start a dead car battery -- and then recharge the phone in the blink of an eye.
Developed by researchers at the University of Illinois at Urbana-Champaign, the new microbatteries out-power even the best supercapacitors and could drive new applications in radio communications and compact electronics.
Led by William P. King, the Bliss Professor of mechanical science and engineering, the researchers published their results in the April 16 issue of Nature Communications.
"This is a whole new way to think about batteries," King said. "A battery can deliver far more power than anybody ever thought. In recent decades, electronics have gotten small. The thinking parts of computers have gotten small. And the battery has lagged far behind. This is a microtechnology that could change all of that. Now the power source is as high-performance as the rest of it."
Developed by researchers at the University of Illinois at Urbana-Champaign, the new microbatteries out-power even the best supercapacitors and could drive new applications in radio communications and compact electronics.
Led by William P. King, the Bliss Professor of mechanical science and engineering, the researchers published their results in the April 16 issue of Nature Communications.
"This is a whole new way to think about batteries," King said. "A battery can deliver far more power than anybody ever thought. In recent decades, electronics have gotten small. The thinking parts of computers have gotten small. And the battery has lagged far behind. This is a microtechnology that could change all of that. Now the power source is as high-performance as the rest of it."
Peel-and-stick solar cells
It may be possible soon to charge cell phones, change the tint on windows, or power small toys with peel-and-stick versions of solar cells, thanks to a partnership between Stanford University and the U.S. Department of Energy's National Renewable Energy Laboratory (NREL).
A scientific paper, "Peel and Stick: Fabricating Thin Film Solar Cells on Universal Substrates," appears in the online version of Scientific Reports, a subsidiary of the British scientific journal Nature.
Peel-and-stick, or water-assisted transfer printing (WTP), technologies were developed by the Stanford group and have been used before for nanowire based electronics, but the Stanford-NREL partnership has conducted the first successful demonstration using actual thin film solar cells, NREL principal scientist Qi Wang said.
The university and NREL showed that thin-film solar cells less than one-micron thick can be removed from a silicon substrate used for fabrication by dipping them in water at room temperature. Then, after exposure to heat of about 90°C for a few seconds, they can attach to almost any surface.
A scientific paper, "Peel and Stick: Fabricating Thin Film Solar Cells on Universal Substrates," appears in the online version of Scientific Reports, a subsidiary of the British scientific journal Nature.
Peel-and-stick, or water-assisted transfer printing (WTP), technologies were developed by the Stanford group and have been used before for nanowire based electronics, but the Stanford-NREL partnership has conducted the first successful demonstration using actual thin film solar cells, NREL principal scientist Qi Wang said.
The university and NREL showed that thin-film solar cells less than one-micron thick can be removed from a silicon substrate used for fabrication by dipping them in water at room temperature. Then, after exposure to heat of about 90°C for a few seconds, they can attach to almost any surface.
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