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Tag: "before" at biology news

Brain's reward circuit activity ebbs and flows with a woman's hormonal cycle

...ng simulated slot machines. The women were scanned before and after ovulation. The fMRI pictures showed that when the women were anticipating a reward, they activated the amygdala and a cortex area behind the eyes that regulates emotion and reward-related planning behavior more during the pre-ovulation ...

Paper challenges 1491 Amazonian population theories

...l. The study needs to be replicated in more places before people will be persuaded, but it's certainly a warning shot across the bow." "While the majority of archaeologists argue the rivers were the major conduit for populations," he adds, "there is an increasing vocalization that there was much more wi...

Scientists genetically engineer tomatoes with enhanced folate content

...food plant approved by the FDA," Hanson said. "But before that is even a question, there are many more studies to be done--including a better look at how the overall product is affected by this alteration." And there is another hurdle the researchers must clear. Boosting the production of folate in tomat...

Study suggests some drug resistance to influenza B medications

...rs collected influenza B isolates from 74 children before and after oseltamivir therapy and from 348 untreated patients with influenza (including 66 adults). Four hundred twenty-two viruses from untreated patients and 74 samples from patients after oseltamivir therapy were analyzed. The researchers ident...

Gut research yields new anti-cancer approach

... with frustration that her cancer cells were dying before she could complete her experiments. Retracing her steps, she found that she had used too much inhibitor. The team, led by Lawrence J. Saubermann, M.D., associate professor of Medicine at the Medical Center, realized they had come across a potentially...

Red flag for repetitive stress injuries identified for first time in humans

...r type of injury, they do provide a red flag where before there was none," said Barr, associate professor of...oal has been finding a means to detect the problem before the damage starts. That way, conservative intervention ?ibuprofen, rest breaks at work, exercise ?ca...

Gene tests and brain imaging reveal early dementia

...roaching Alzheimer's can be detected several years before the symptoms manifest themselves. Dementia invol... to identify people who will develop dementia even before any clinical symptoms appear. "This is a crucial step towards the better diagnosis of Alzheimer'...

Study shows isolation of stem cells may lead to a treatment for hearing loss

...rate new hair cells. “Clearly we have miles to go before we reach our end goal, but the exciting part is no...g loss and of those, one in 500 people become deaf before reaching adulthood. In most cases, the target is the highly specialized hair cells. Docked inside ...

Male-killing bacteria makes female butterflies more promiscuous

...tted from mother to son and actually kills the son before the embryo hatches into a caterpillar. Only female offspring of female carriers of the bacteria can survive, which can lead to the male population being as low as one male to every hundred females in some areas. Dr Greg Hurst, of the UCL Departmen...

Despite their heft, many dinosaurs had surprisingly tiny genomes

...ur work shows these streamlined genomes arose long before the first birds and flight, and can be added to the list of dinosaur traits previously thought to be found only in modern birds, including feathers, pulmonary innovations, and parental care and nesting." Other researchers had previously determined...

Study finds antibiotic resistance in poultry even when antibiotics were not used

... isn't going to help. You have to put in some work before that." Lee and her team sampled droppings from more than 140,000 birds under four different conditions: 1.) commercial flocks that had been given antibiotics; 2.) commercial flocks that had not been given antibiotics; 3.) flocks raised in a lab th...

Need oxygen? Cells know how to spend and save

..., or COX for short. If electrons react with oxygen before reaching COX, they generate "free radicals" that can damage or destroy cells. The mitochondria are designed to produce energy without excess free radical production at normal oxygen levels. Semenza's team noticed that one particular component of...

The penalty of having a sister -- why sibling sex matters for male saiga antelopes

...are from different populations of saiga, from both before and after the recent extreme decline in saiga numbers ?yet the results of both datasets are qualitatively the same. The research team, alongside local rangers, weighed and measured saiga calves during the birth season in May over a period of thre...

New player in commitment to life as a fat cell

... a novel antiobesity therapy designed to fight fat before it even forms, the researchers said. Known for its role in producing the metabolic byproduct uric acid, XOR had earlier been implicated in gout, said Jeffrey Friedman of The Rockefeller University, senior author of the study. Gout is a painful type ...

Woman's Day and For Womens of Science

...es more mercury is falling from the sky today than before the Industrial Revolution 200 years ago as a result of the increasing use of mercury and industrial emissions. The uncontrolled use of mercury in small-scale gold mining is contaminating thousands of sites around the world, posing long-term health ...

Mercury contamination of fish warrants worldwide public warning

...es more mercury is falling from the sky today than before the Industrial Revolution 200 years ago as a result of the increasing use of mercury and industrial emissions. The uncontrolled use of mercury in small-scale gold mining is contaminating thousands of sites around the world, posing long-term health ...

Enhancing activity of marijuana-like chemicals in brain helps treat

...Sciences. "Of course, it is a long, long way to go before this will be tested in humans, but nonetheless, we have identified a new way of potentially manipulating the circuits that are malfunctioning in this disease." Malenka and postdoctoral scholar Anatol Kreitzer, PhD, the study's lead author, comb...

Study examines risk of soft tissue sarcomas in hereditary retinoblastoma survivors

...arily affects children and is most often diagnosed before age 1. The disease can often be cured; 97 percent of retinoblastoma patients survive 5 years after diagnosis. However, patients with hereditary retinoblastoma are at a high risk of developing another cancer, including soft tissue sarcomas. The increa...

Study finds surfing safer than soccer

...sts good physical fitness, seeking local knowledge before paddling out to an unfamiliar break, and being realistic in terms of your ability level and the size of the waves. Further research is needed to determine if an injury rate can be calculated for recreational surfers and to evaluate the effectiven...

How trees manage water in arid environments

...ration into the dry air. Most of the rest runs off before it can soak into the ground. Maintaining an adequa...opposite. __IMAGE_3 "During the summer season before the heavy rains, when almost all the winter precipitation had been evaporated and the soil was extre...

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