A team of UCLA researchers has created the most powerful high-performance nanoscale microwave oscillators in the world, a development that could lead to cheaper, more energy-efficient mobile communication devices that deliver much better signal quality. Today's cell phones, WiFi–enabled tablets and other electronic gadgets all use microwave oscillators, tiny devices that generate the electrical signals used in communications. In a cell phone, for example, the transmitter and receiver circuits contain oscillators that produce radio-frequency signals, which are then converted ...

A classic study from more than 60 years ago suggesting that males are more promiscuous and females more choosy in selecting mates may, in fact, be wrong, say life scientists who are the first to repeat the historic experiment using the same methods as the original. In 1948, English geneticist Angus John Bateman published a study showing that male fruit flies gain an evolutionary advantage from having multiple mates, while their female counterparts do not. Bateman's conclusions have informed and influenced an entire sub-field of evolutionary biology for decades. "Bateman's ...

In the brains of humans and non-human primates, over 100 billion nerve cells build up complicated neural circuits and produce higher brain functions. When an attempt is made to perform gene therapy for neurological diseases like Parkinson's disease, it is necessary to specify a responsible neural circuit out of many complicated circuits. Until now, however, it was difficult to introduce a target gene into this particular circuit selectively. The collaborative research group consisting of Professor Masahiko TAKADA from Primate Research Institute, Kyoto University, Professor ...

PHILADELPHIA -- Researchers have long been interested in discovering the ways that human brains represent thoughts through a complex interplay of elec-trical signals. Recent improvements in brain recording and statistical methods have given researchers unprecedented insight into the physical processes under-lying thoughts. For example, researchers have begun to show that it is possible to use brain recordings to reconstruct aspects of an image or movie clip someone is viewing, a sound someone is hearing or even the text someone is reading. A new study by University ...

Charlottesville, VA (June 26, 2012). Researchers at the University of Michigan have found that the Apple iPad 2 can interfere with settings of magnetically programmable shunt devices, which are often used to treat children with hydrocephalus. The iPad 2 contains magnets that can change valve settings in the shunt if the tablet computer is held too close to the valve (within 2 inches). Such a change may result in shunt malfunction until the problem is recognized and the valve adjusted to the proper setting. Patients and their caregivers should monitor use of the tablet computer ...

An investigation led by UCSF has found that the risk of female-to-male HIV transmission is increased three fold for women with bacterial vaginosis, a common disorder in which the normal balance of bacteria in the vagina is disrupted. "Previous research has shown that bacterial vaginosis can increase a women's risk of becoming infected with HIV as much as sixty percent. Our study is the first to show that the risk of transmitting HIV is also elevated. Our findings point to the need for additional research to improve the diagnosis and treatment of bacterial vaginosis, ...

If you drink coffee regularly in moderation, you could reduce your risk of heart failure, according to new research in the American Heart Association's journal Circulation Heart Failure. Researchers, analyzing previous studies on the link between coffee consumption and heart failure, found that moderate coffee drinking as part of a daily routine may be linked with a significantly lower risk of heart failure. In contrast, indulging excessively may be linked with an increased chance of developing serious heart problems. "While there is a commonly held belief that regular ...

Stanford University scientists have breathed new life into the nickel-iron battery, a rechargeable technology developed by Thomas Edison more than a century ago. Designed in the early 1900s to power electric vehicles, the Edison battery largely went out of favor in the mid-1970s. Today only a handful of companies manufacture nickel-iron batteries, primarily to store surplus electricity from solar panels and wind turbines. "The Edison battery is very durable, but it has a number of drawbacks," said Hongjie Dai, a professor of chemistry at Stanford. "A typical battery ...

"There is significant penetration by multinational processed food manufacturers such as Nestle, Kraft, PepsiCo, and Danone into food environments in low-and-middle income countries, where consumption of unhealthy commodities is reaching—and in some cases exceeding—a level presently observed in high income countries", according to international researchers writing in this week's PLoS Medicine. The authors from the UK, US, and India (led by David Stuckler from the University of Cambridge), analysed trends in unhealthy food and beverages (sugary drinks and processed foods ...

Addressing the twin crises of malnutrition around the world—hunger and obesity— demands that we ask who has power over food, rather than question just the mere presence or absence of food. This is the argument of Raj Patel, activist, author of Stuffed and Starved: The Hidden Battle for the World Food System and fellow at the University of KwaZulu-Natal's School of Development Studies, in a new Essay in PLoS Medicine this week, which says that "understanding hunger and malnutrition requires an examination of what systems and institutions hold power over food," including ...

Prenatal exposure to a ubiquitous household chemical called butylbenzyl phthalate (BBzP) can increase a child's risk for developing eczema, according to research conducted at the Columbia Center for Children's Environmental Health at the Mailman School of Public Health. Widely used in vinyl flooring, artificial leather and other materials, BBzB can be slowly released into air in homes. Details are published in the advance online edition of Environmental Health Perspectives, a journal of the National Institute of Environmental Health Sciences. Eczema, which is characterized ...

Boston, Mass., June 26, 2012 – A new study published today in the Journal of American Medical Association challenges the notion that "a calorie is a calorie." The study, led by Cara Ebbeling, PhD, associate director and David Ludwig, MD, director of the New Balance Foundation Obesity Prevention Center Boston Children's Hospital, finds diets that reduce the surge in blood sugar after a meal--either low-glycemic index or very-low carbohydrate–may be preferable to a low-fat diet for those trying to achieve lasting weight loss. Furthermore, the study finds that the low-glycemic ...

DURHAM, N.C.— The clot-busting medicine, tPA (tissue plasminogen activator), is safe to use in acute stroke patients already on the home blood thinner warfarin, according to researchers from Duke Clinical Research Institute (DCRI). This study helps allay previous concerns that tPA was too dangerous to use in patients on home anticoagulation and would lead to high risk for potentially fatal intracranial bleeding. "To date, we have no randomized trials or large cohort studies to guide us," says Ying Xian, M.D., Ph.D., assistant professor of medicine at Duke, and first ...

CHICAGO – Although a standard behavioral weight loss intervention among overweight and obese adults resulted in greater average weight loss over 18 months, a stepped care intervention resulted in clinically meaningful weight loss that cost less to implement, according to a study in the June 27 issue of JAMA. "Most weight loss programs are intensive during the initial weeks of treatment, become less intensive over time, and maintain a fixed contact schedule for participants irrespective of treatment success or failure. Intensive weight loss programs are costly and require ...

CHICAGO – In an examination of the effect on energy expenditure and components of the metabolic syndrome of 3 types of commonly consumed diets following weight loss, decreases in resting energy expenditure and total energy expenditure were greatest with a low-fat diet, intermediate with a low-glycemic index diet, and least with a very low-carbohydrate diet, suggesting that a low-fat diet may increase the risk for weight regain compared to the other diets, according to preliminary research published in the June 27 issue of JAMA. "Many people can lose weight for a few ...

PASADENA, Calif., June 26, 2012 – Programs to promote healthy eating can substantially reduce the amount of unhealthy foods and beverages on school grounds if the programs focus on a school's specific needs and involve teachers, parents, staff, and administrators, according to a Kaiser Permanente Southern California study published in BioMed Central's open access journal International Journal of Behavioral Nutrition and Physical Activity. The Healthy Options for Nutrition Environments in Schools (Healthy ONES) study used a public health approach to change nutrition environments ...

The inexorable spread of Alzheimer's disease through the brain leaves dead neurons and forgotten thoughts in its wake. Researchers at Linköping University in Sweden are the first to show how toxic proteins are transferred from neuron to neuron. Through experiments on stained neurons, the research team – under the leadership of Martin Hallbeck, associate professor of Pathology – has been able to depict the process of neurons being invaded by diseased proteins that are then passed on to nearby cells. "The spread of Alzheimer's, which can be studied in the brains of diseased ...

CHICAGO – An analysis that included 1.2 million veterans enrolled in the Veterans Affairs health care system and Medicare Advantage plan finds that the federal government spends a substantial and increasing amount of potentially duplicative funds in these separate managed care programs for the care of same individuals, according to a study appearing in JAMA. This study is being published early online to coincide with its presentation at the Annual Research Meeting of AcademyHealth. "In the United States, some adults may be eligible to enroll simultaneously in 2 federally ...

Madrid, 26 June 2012: Preliminary findings from the EVINCI study show that the prevalence of "significant" coronary artery disease in patients with chest pain symptoms is lower than expected in Europe. In as much as 75% of this population an accurate non-invasive screening could avoid unnecessary and costly invasive procedures. The three year multicentre European trial will define the most cost effective strategy for diagnosing patients with suspected coronary artery disease. The EValuation of INtegrated Cardiac Imaging (EVINCI) study was completed on 15 June. Preliminary ...

Charlottesville, VA (June 26, 2012). Researchers from the Department of Neurosurgery at the David Geffen School of Medicine and the Department of Integrative Biology and Physiology at UCLA have found that a diet enriched with docosahexaenoic acid (DHA), an omega-3 fatty acid, and curcumin, a component of the Indian spice turmeric, can protect the injured spinal cord and minimize the clinical and biochemical effects of spinal cord myelopathy in rats. This finding is fleshed out in the article "Dietary therapy to promote neuroprotection in chronic spinal cord injury. Laboratory ...

Patients with a gland disorder that causes excessive calcium in their blood who also have vitamin D deficiency can safely receive vitamin D treatment without it raising their calcium levels, a new study has determined. The results with one-year follow-up will be presented Tuesday at The Endocrine Society's 94th Annual Meeting in Houston. Doctors often fear that raising vitamin D levels will further raise calcium blood levels in patients with primary hyperparathyroidism—in which glands in the neck produce too much of the parathyroid hormone, which controls calcium levels. ...

Prenatal exposure to bisphenol A, or BPA, a chemical found in many common plastic household items, can cause numerous genes in the uterus to respond differently to estrogen in adulthood, according to a study using a mouse model. The results will be presented Tuesday at The Endocrine Society's 94th Annual Meeting in Houston. The study, led by Hugh Taylor, MD, professor and chief of the reproductive endocrinology section at Yale University School of Medicine, observed "major and permanent changes in gene expression" in female mice exposed to BPA as a fetus. Taylor said ...

Obese children show greater exposure than nonobese children to a phthalate, a chemical used to soften plastics in some children's toys and many household products, according to a new study, which found that the obesity risk increases according to the level of the chemical found in the bloodstream. The study will be presented Saturday at The Endocrine Society's 94th Annual Meeting in Houston. The chemical, di-ethylhexyl phthalate (DEHP), is a common type of phthalate, a group of industrial chemicals that are suspected endocrine disruptors, or hormone-altering agents. In ...

Prenatal exposure to the environmental contaminants polychlorinated biphenyls, or PCBs, causes long-term changes to the developing brain that have adverse effects on reproductive function later in life, a new study finds. Results will be presented Saturday at The Endocrine Society's 94th Annual Meeting in Houston. The study used rats, whose genes and molecules in the hypothalamus—the region of the brain important for reproductive function—are virtually identical to those in humans, according to co-author Andrea Gore, PhD, professor of pharmacology and toxicology at the ...

A large study in people at risk of diabetes has found a direct association between the presence of a small genetic alteration in a hormone receptor and increased body fat and insulin resistance. The results, to be presented Tuesday at The Endocrine Society's 94th Annual Meeting in Houston, suggest an adverse role for a previously described genetic variant, the BclI polymorphism. "Our findings support the idea that even small variations in hormone receptor sensitivity can have metabolic implications, such as obesity or diabetes," said co-author Bastiaan Havekes, MD, PhD, ...