On the night of July 20, 2012, the laser system of the Berkeley Lab Laser Accelerator (BELLA), which is nearing completion at the U.S. Department of Energy's Lawrence Berkeley National Laboratory (Berkeley Lab), delivered a petawatt of power in a pulse just 40 femtoseconds long at a pulse rate of one hertz – one pulse every second. A petawatt is 1015 watts, a quadrillion watts, and a femtosecond is 10-15 second, a quadrillionth of a second. No other laser system has achieved this peak power at this rapid pulse rate. "This represents a new world record," said Wim Leemans ...

TORONTO, July 27,2012 –Heterosexual men make up a small but growing number of people infected with HIV in Canada. Yet a new study has found that many of them feel existing HIV-related programs and services don't meet their needs and are geared primarily or exclusively toward gay men and heterosexual women who are living with the virus. "Heterosexual men tend to go through HIV alone," said Tony Antoniou, a pharmacist and research scholar in the Department of Family Medicine at St. Michael's Hospital. "They feel very isolated." Antoniou said the study, published in the ...

INDIANAPOLIS -- Group yoga can improve motor function and balance in stroke survivors, even if they don't begin yoga until six months or more after the stroke, according to "Post-Stroke Balance Improves With Yoga: A Pilot Study," published online July 26 in the journal Stroke. Forty-seven older adults, three-quarters of whom were male, participated in the study. They were divided into three sections: One section engaged in twice-weekly group yoga for eight weeks; the second section met twice weekly for group yoga and was provided with a relaxation audio recording to ...

Phase transitions between different states of matter can be associated with a specific type of excitation called the "Higgs excitation". This phenomenon has now been ob-served in a two-dimensional quantum gas at temperatures near absolute zero. In physics spontaneous symmetry breaking is a fundamental feature of transitions between different states of matter. An example of this phenomenon is the abrupt alignment of spin orientation in a ferromagnetic substance when the material is cooled below the so-called Curie temperature. Phase transitions introduce a new degree of ...

For theoretical physicist Dima Shepelyansky from the CNRS-University of Toulouse, France, devising models of chaos and turbulence is his bread and butter. In a recent study published in EPJ B¹, he presents an exception he found in a model of turbulence, indicating that there are energy flows from large to small scale in confined space. Indeed, under a specific energy threshold, there are no energy flows, similar to the way electron currents and energy spreading are stopped in disordered solids. The author relies on numerical simulations to study a kind of turbulence—known ...

PHILADELPHIA - A tiny vibrating cantilever sensor could soon help doctors and field clinicians quickly detect harmful toxins, bacteria and even indicators of certain types of cancer from small samples of blood or urine. Researchers from Drexel University are in the process of refining a sensor technology that they developed to measure samples at the cellular level into an accurate method for quickly detecting traces of DNA in liquid samples. According to lead researcher Dr. Raj Mutharasan, a professor in Drexel's College of Engineering, the group's unique application ...

Boston, MA – Anyone that has ever had trouble sleeping can attest to the difficulties at work the following day. Experts recommend eight hours of sleep per night for ideal health and productivity, but what if five to six hours of sleep is your norm? Is your work still negatively affected? A team of researchers at Brigham and Women's Hospital (BWH) have discovered that regardless of how tired you perceive yourself to be, that lack of sleep can influence the way you perform certain tasks. This finding is published in the July 26, 2012 online edition of The Journal of ...

This press release is available in German. Which areas of the brain help us to perceive our world in a self-reflective manner is difficult to measure. During wakefulness, we are always conscious of ourselves. In sleep, however, we are not. But there are people, known as lucid dreamers, who can become aware of dreaming during sleep. Studies employing magnetic resonance tomography (MRT) have now been able to demonstrate that a specific cortical network consisting of the right dorsolateral prefrontal cortex, the frontopolar regions and the precuneus is activated when this ...

COLUMBIA, Mo. – In a University of Missouri study, girls and boys started grade school with different approaches to solving arithmetic problems, with girls favoring a slow and accurate approach and boys a faster but more error prone approach. Girls' approach gave them an early advantage, but by the end of sixth grade boys had surpassed the girls. The MU study found that boys showed more preference for solving arithmetic problems by reciting an answer from memory, whereas girls were more likely to compute the answer by counting. Understanding these results may help teachers ...

CHESTNUT HILL, MA (July 27, 2012) – Matchmaking managers can improve customer relations and increase repeat business by pairing employees and customers with similar personalities, according to a report in the latest edition of the Journal of Service Research. The study by three German researchers suggests that managers use role-playing exercises, videotaped rehearsals and on-site evaluations to better determine the service experience from the customer's perspective. Then match the right employees with the right customers, report marketing professors Jan Wieseke, of Ruhr-University ...

Georgia contains the largest area of forest cover of any state in the South, with forests making up 67 percent of land cover or 24.8 million acres, according to a Forest Inventory Analysis (FIA) Factsheet just released by the USDA Forest Service Southern Research Station (SRS). While this land area remains stable, timber inventory has increased. "Forest area in Georgia remained relatively stable over the last 50 years," says Richard Harper, SRS forester and author of the analysis. "While forest area stayed about the same, timber inventory more than doubled over the same ...

(Boston) – Researchers from Boston University School of Medicine (BUSM) have found an association between childhood physical and sexual abuse and age at menarche. The findings are published online in the Journal of Adolescent Health. Researchers led by corresponding author, Renée Boynton-Jarrett, MD, assistant professor of pediatrics at BUSM, found a 49 percent increase in risk for early onset menarche (menstrual periods prior to age 11 years) among women who reported childhood sexual abuse compared to those who were not abused. In addition, there was a 50 percent increase ...

The results from a nationally representative HIV incidence study in Swaziland indicate that the national rate of new HIV infections is 2.38% among adults ages 18-49. This figure, comparable to the 2009 UNAIDS estimate of 2.66% for Swaziland adults ages 15-49, suggests that the HIV epidemic in Swaziland may have begun to stabilize in the past few years. The findings of the Swaziland HIV Incidence Measurement Survey (SHIMS) were presented today at the XIX International AIDS Conference in Washington DC. "The country continues to have very high HIV incidence rates. Since ...

COLUMBUS, Ohio – A new census of the Amish population in the United States estimates that a new Amish community is founded, on average, about every 3 ½ weeks, and shows that more than 60 percent of all existing Amish settlements have been founded since 1990. This pattern suggests the Amish are growing more rapidly than most other religions in the United States, researchers say. Unlike other religious groups, however, the growth is not driven by converts joining the faith, but instead can be attributed to large families and high rates of baptism. In all, the census counts ...

Boston, MA – Two men with longstanding HIV infections no longer have detectable HIV in their blood cells following bone marrow transplants. The virus was easily detected in blood lymphocytes of both men prior to their transplants but became undetectable by eight months post-transplant. The men, who were treated at Brigham and Women's Hospital (BWH), have remained on anti-retroviral therapy. Their cases will be presented on July 26, 2012 at the International AIDS Conference by Timothy Henrich, MD and Daniel Kuritzkes, MD, physician-researchers in the Division of Infectious ...

AUSTIN, Texas — Even in this modern age of science, people are likely to find logic in supernatural rituals that require a high degree of time and effort, according to new research from The University of Texas at Austin. The study, published in the June issue of Cognition, is the first psychological analysis of how people of various cultures evaluate the efficacy of ritual beliefs. The findings provide new insight into cognitive reasoning processes — and how people intuitively make sense out of the unknown. "One of the most remarkable characteristics of human cognition ...

(Boston) – A recent study led by Boston University School of Medicine (BUSM) demonstrates that the A2b-type adenosine receptor, A2bAR, plays a significant role in the regulation of high fat, high cholesterol diet-induced symptoms of type 2 diabetes. The findings, which are published online in PLoS ONE, also identify A2bAR as a potential target for the treatment of type 2 diabetes. Katya Ravid, DSc/PhD, professor of medicine and biochemistry and director of the Evans Center for Interdisciplinary Biomedical Research at BUSM, led this study. Colleagues from Ravid's lab ...

Fighting "superbugs" – strains of pathogenic bacteria that are impervious to the antibiotics that subdued their predecessor generations – has required physicians to seek new and more powerful drugs for their arsenals. Unfortunately, in time, these treatments also can fall prey to the same microbial ability to become drug resistant. Now, a research team at the University of North Carolina at Chapel Hill (UNC) may have found a way to break the cycle that doesn't demand the deployment of a next-generation medical therapy: preventing "superbugs" from genetically propagating ...

For decades, scientists have known that the effects of global climate change could have a potentially devastating impact across the globe, but Harvard researchers say there is now evidence that it may also have a dramatic impact on public health. As reported in a paper published in the July 27 issue of Science, a team of researchers led by James G. Anderson, the Philip S. Weld Professor of Atmospheric Chemistry, are warning that a newly-discovered connection between climate change and depletion of the ozone layer over the U.S. could allow more damaging ultraviolet (UV) ...

How do sexual cues affect consumer behavior? New research from USC Marshall School of Business Assistant Professor of Marketing Kyu Kim and Gal Zauberman, associate professor of marketing at The Wharton School at the University of Pennsylvania, reveals the reasons why sexual cues cause us to be impatient and can affect monetary decisions. Their paper, "Can Victoria's Secret Change the Future: A Subjective Time Perception Account of Sexual Cue Effects on Impatience," departs from earlier theories indicating that impatience in response to sexual cues is solely an outcome ...

WHAT: A research team at the National Institutes of Health has found that bacteria that normally live in the skin may help protect the body from infection. As the largest organ of the body, the skin represents a major site of interaction with microbes in the environment. Although immune cells in the skin protect against harmful organisms, until now, it has not been known if the millions of naturally occurring commensal bacteria in the skin—collectively known as the skin microbiota—also have a beneficial role. Using mouse models, the NIH team observed that commensals ...

A brief therapeutic intervention called motivational interviewing, administered over the telephone, was significantly more effective than a simple "check-in" call in getting Iraq and Afghanistan war veterans with mental health diagnoses to begin treatment for their conditions, in a study led by a physician at the San Francisco VA Medical Center and the University of California, San Francisco. Participants receiving telephone motivational interviewing also were significantly more likely to stay in therapy, and reported reductions in marijuana use and a decreased sense ...

PHILADELPHIA—Breast cancer patients whose tumors lacked the retinoblastoma tumor suppressor gene (RB) had an improved pathological response to neoadjuvant chemotherapy, researchers at Thomas Jefferson University Hospital and the Kimmel Cancer Center at Jefferson report in a retrospective study published in a recent online issue of Clinical Cancer Research. Many breast cancer patients undergo neoadjuvant therapy to reduce the size or extent of the cancer before surgical intervention. Complete response of the tumor to such treatment signifies an improved overall prognosis. ...

Almost 20 years after scientists first identified cigarette smoking as a risk factor for osteoporosis and bone fractures, a new study is shedding light on exactly how cigarette smoke weakens bones. The report, in ACS' Journal of Proteome Research, concludes that cigarette smoke makes people produce excessive amounts of two proteins that trigger a natural body process that breaks down bone. Gary Guishan Xiao and colleagues point out that previous studies suggested toxins in cigarette smoke weakened bones by affecting the activity of osteoblasts, cells which build new bone, ...

Scientists are reporting another reason — besides possible liver damage, stomach bleeding and other side effects — to avoid drinking alcohol while taking certain medicines. Their report in ACS' journal Molecular Pharmaceutics describes laboratory experiments in which alcohol made several medications up to three times more available to the body, effectively tripling the original dose. Christel Bergström and colleagues explain that beverage alcohol, or ethanol, can cause an increase in the amount of non-prescription and prescription drugs that are "available" to the body ...