SALT LAKE CITY, Nov. 27, 2012 – A University of Utah study produced new mathematical support for a theory that explains why men in some cultures often feed and care for their sisters' children: where extramarital sex is common and accepted, a man's genes are more likely to be passed on by their sister's kids than by their wife's kids. The theory previously was believed valid only if a man was likely to be the biological father of less than one in four of his wife's children – a number that anthropologists found improbably low. But in the new study, University of ...

Coasts and estuaries are among the most rapidly developing areas on Earth. Night-time satellite images of the planet show that except Antarctica, continents are ringed with halos of brightly-lit human development. But coasts are also key wildlife sites. Every year, millions of waterbirds arrive from the Arctic to overwinter on UK coasts, yet scientists remain largely in the dark about how these birds respond to the bright lights of coastal cities and industry. To shed light on the issue, Dr Ross Dwyer and colleagues from the University of Exeter investigated how artificial ...

Sea-levels are rising 60 per cent faster than the Intergovernmental Panel on Climate Change's (IPCC) central projections, new research suggests. While temperature rises appear to be consistent with the projections made in the IPCC's fourth assessment report (AR4), satellite measurements show that sea-levels are actually rising at a rate of 3.2 mm a year compared to the best estimate of 2 mm a year in the report. The researchers, from the Potsdam Institute for Climate Impact Research, Tempo Analytics and Laboratoire d'Etudes en Géophysique et Océanographie Spatiales, ...

ANN ARBOR, Mich. — About 70 percent of women who have both breasts removed following a breast cancer diagnosis do so despite a very low risk of facing cancer in the healthy breast, new research from the University of Michigan Comprehensive Cancer Center finds. Recent studies have shown an increase in women with breast cancer choosing this more aggressive surgery, called contralateral prophylactic mastectomy, which raises the question of potential overtreatment among these patients. The study found that 90 percent of women who had surgery to remove both breasts reported ...

Heart failure affects 3 per cent of the overall population, and exists in two forms: reduced ability to contract the heart and reduced ability to relax the heart. The former affects younger patients, mostly men, and is treatable. The latter, called HFPEF (heart failure with preserved ejection fraction), affects older patients and women, and until now there has not been any treatment available against the disease. In the present study, a team comprising researchers at Karolinska Institutet, Linköping University, Stockholm South General Hospital and Karolinska University ...

Digoxin, a drug that has been used worldwide for centuries to treat heart disease, is associated with a significant increase in deaths in patients with atrial fibrillation (AF), according to results from a study published online today (Wednesday) in the European Heart Journal [1]. Digoxin is extracted from the foxglove plant (digitalis) and it helps the heart beat more strongly and with a more regular rhythm. It is commonly used in AF patients, and also in patients with heart failure. However, it can be problematic to use successfully as there is a narrow dose range at ...

People with an overactive thyroid gland (hyperthyroidism) carry a greater risk of developing irregular heart rhythm (known as atrial fibrillation) than those with normal thyroid function, finds a study published on bmj.com today. As such, the researchers suggest there should be an increased focus on atrial fibrillation in patients with raised thyroid function. Hyperthyroidism occurs when the thyroid gland makes too much thyroxine (thyroid hormone), causing many of the body's functions to speed up. About 1 in 100 women and 1 in 1,000 men develop hyperthyroidism at some ...

Women who develop pre-eclampsia during their first pregnancy (known as preterm pre-eclampsia) - and who don't go on to have any more children – are at greater risk of dying from heart disease in later life than women who have subsequent children, finds a study published on bmj.com today. Women who develop the condition only in the final weeks of pregnancy (known as term pre-eclampsia) are at less risk. This high risk to one child mothers has not been previously reported and suggests that these women need special monitoring, especially if their pre-eclampsia was preterm. ...

That sea level is rising faster than expected could mean that the Intergovernmental Panel on Climate Change's (IPCC) sea-level rise projections for the future may be biased low as well, their results suggest. Sea-level rise potentially affects millions of people all around the world in coastal areas as well as megacities like Tokyo. "Global temperature continues to rise at the rate that was projected in the last two IPCC Reports. This shows again that global warming has not slowed down or is lagging behind the projections," Rahmstorf says. Five global land and ocean ...

Fresh insight into the parasite that causes malaria suggests a new way to develop drugs and vaccines to tackle the disease. Research into malaria parasites – which exist in male and female forms, and mate to spread the disease – suggests that treatments would be more likely to succeed if designed to target female forms of the parasite. Scientists found that male parasites can adapt to new surroundings faster than the females. When malaria infects the bloodstream after a mosquito bite, the male parasites are better able to react quickly to repeated attacks by the immune ...

Every kid knows that giant carnivores like Tyrannosaurus rex dominated the Cretaceous period, but they weren't the only big guys in town. Giant plant-eating theropods – close relatives of both T. rex and today's birds – also lived and thrived alongside their meat-eating cousins. Now researchers have started looking at why dinosaurs that abandoned meat in favor of vegetarian diets got so big, and their results may call conventional wisdom about plant-eaters and body size into question. Scientists have theorized that bigger was better when it came to plant eaters, because ...

LA JOLLA, Calif., November 27, 2012 – Herbs widely used throughout history in Asian and early European cultures have received renewed attention by Western medicine in recent years. Scientists are now isolating the active compounds in many medicinal herbs and documenting their antioxidant and anti-inflammatory activities. In a study published in the journal Investigative Ophthalmology & Visual Science, Stuart A. Lipton, M.D., Ph.D. and colleagues at Sanford-Burnham Medical Research Institute (Sanford-Burnham) report that carnosic acid, a component of the herb rosemary, promotes ...

WASHINGTON - The hydraulic system of trees is so finely-tuned that predicted increases in drought due to climate change may lead to catastrophic failure in many species. A recent paper co-authored by George Washington University Assistant Professor of Biological Sciences Amy Zanne finds that those systems in plants around the globe are operating at the top of their safety threshold, making forest ecosystems vulnerable to increasing environmental stress. In the current issue of the journal Nature, Dr. Zanne and lead authors from the University of Western Sydney in Australia ...

Boulder, Colorado, USA - Social and physical scientists have long been concerned about the effects of humans on Earth's surface -- in part through deforestation, encroachment of urban areas onto traditionally agricultural lands, and erosion of soils -- and the implications these changes have on Earth's ability to provide for an ever-growing population. The December 2012 GSA Today science article presents examples of land transformation by humans and documents some of the effects of these changes. Researchers Roger Hooke of the University of Maine, USA, and José F. Martín-Duque ...

ROCHESTER, Minn. -- It's one of the toughest questions patients and their loved ones can discuss with physicians: When is further medical treatment futile? The conversation can become even more difficult if patients or their families disagree with health care providers' recommendations on end-of-life care. Early, clear communication between patients and their care teams, choosing objective surrogates to represent patients and involving third parties such as ethics committees can help avoid or resolve conflicts, Mayo Clinic experts Christopher Burkle, M.D., J.D., and Jeffre ...

BUFFALO, N.Y. -- You've already decided that you're going to pop the question. Now comes another quandary: Where to get the ring, if you're buying one? The holidays are a busy time for engagements, and Trina Hamilton, a University at Buffalo expert in corporate responsibility, says socially minded consumers have a lot to think about when it comes to finding the right rock. In recent years, shoppers have turned to Canadian diamonds as news reports and movies exposed the diamond trade's role in fueling armed conflicts in developing countries. (Think "Blood Diamond," the ...

Tension is the theme running through the new consensus statement issued by the Hinxton Group, an international working group on stem cell research and regulation. Specifically, tension between intellectual property policies and scientific norms of free exchange, but also between eastern and western cultures, national and international interests, and privatized vs. nationalized health care systems. The consensus, titled Statement on Data and Materials Sharing and Intellectual Property in Pluripotent Stem Cell Science in Japan and China, was released on the Hinxton Group's ...

UNIVERSITY PARK, Pa. -- Sibling conflict represents parents' number one concern and complaint about family life, but a new prevention program -- designed and carried out by researchers at Penn State -- demonstrates that siblings of elementary-school age can learn to get along. In doing so, they can improve their future health and well-being. "Negative sibling relationships are strongly linked to aggressive, anti-social and delinquent behaviors, including substance use," said Mark Feinberg, research professor in the Prevention Research Center for the Promotion of Human ...

High-resolution real-time images show in mice how nerves may be damaged during the earliest stages of multiple sclerosis. The results suggest that the critical step happens when fibrinogen, a blood-clotting protein, leaks into the central nervous system and activates immune cells called microglia. "We have shown that fibrinogen is the trigger," said Katerina Akassoglou, Ph.D., an associate investigator at the Gladstone Institute for Neurological Disease and professor of neurology at the University of California, San Francisco, and senior author of the paper published ...

The National Science Foundation is suggesting adding a bit of spice to a geophysical scientist's research recipe of rocks, water, air, space and life: Humans. At next month's Fall Meeting of the American Geophysical Union (AGU) a behemoth of a conference of nearly 20,000 Earth and space scientists, educators, students and policy makers, an international group of scientists will make the case for adding the human element to their research. The International Network of Research in Coupled Human and Natural Systems – CHANS-Net – is supported by the National Science ...

LEXINGTON, Ky. (Nov. 27, 2012) -- Digoxin, a drug widely used to treat heart disease, increases the possibility of death when used by patients with a common heart rhythm problem − atrial fibrillation (AF), according to new study findings by University of Kentucky researchers. The results have been published in the prestigious European Heart Journal, and raises serious concerns about the expansive use of this long-standing heart medication in patients with AF. UK researchers led by Dr. Samy Claude Elayi, associate professor of medicine at UK HealthCare's Gill Heart ...

LA JOLLA, CA – November 27, 2012 – Researchers at The Scripps Research Institute (TRSI) are fueling the future of cancer treatment by improving a powerful tool in disease defense: the body's immune system. By revealing a novel but widespread cell signaling process, the scientists may have found a way to manipulate an important component of the immune system into more effectively fighting disease. The study, recently published online ahead of print by the journal Blood, shows that disabling a particular enzyme, called ItpkB, in mice improves the function of a type of immune ...

By using common materials found pretty much anywhere there is dirt, a team of Michigan State University researchers have developed a new thermoelectric material. This is important, they said, because the vast majority of heat that is generated from, for example, a car engine, is lost through the tail pipe. It's the thermoelectric material's job to take that heat and turn it into something useful, like electricity. The researchers, led by Donald Morelli, a professor of chemical engineering and materials science, developed the material based on natural minerals known ...

VIDEO: Princeton University researchers developed an enhanced approach to capturing changes on the Earth's surface via satellite that could provide a more accurate account of how geographic areas change as a... Click here for more information. An enhanced approach to capturing changes on the Earth's surface via satellite could provide a more accurate account of how ice sheets, river basins and other geographic areas are changing as a result of natural and human factors. ...

Toronto, ON (27 November, 2012) -- A new method of growing cardiac tissue is teaching old stem cells new tricks. The discovery, which transforms aged stem cells into cells that function like much younger ones, may one day enable scientists to grow cardiac patches for damaged or diseased hearts from a patient's own stem cells—no matter what age the patient—while avoiding the threat of rejection. Stem cell therapies involving donated bone marrow stem cells run the risk of patient rejection in a portion of the population, argues Milica Radisic, Canada Research Chair in ...