Scientists have established a genetic mouse model for primary ovarian insufficiency (POI), a human condition in which women experience irregular menstrual cycles and reduced fertility, and early exposure to estrogen deficiency. POI affects approximately one in a hundred women. In most cases of primary ovarian insufficiency, the cause is mysterious, although genetics is known to play a causative role.
A certain protein significantly reduces the malaria-infected cells' ability to squeeze through tiny channels compared to healthy cells.
Less than half of U.S. schools address pandemic preparedness in their school plan, and only 40 percent have updated their school plan since the 2009 H1N1 pandemic, according to a new study.
Non-pain-related factors—including previous use of pain medications, high perceived risk of addiction, and symptoms of depression—increase the risk of continuing to use strong pain-relieving drugs several months after surgery, according to a new study.
Hand and facial transplants are still rare, but experience so far has produced some suggested guidelines for anesthetic management in patients undergoing these complex "composite" transplant procedures, according to a pair of articles.
Water pipe smoking, such as hookah or bong smoking, affects lung function and respiratory symptoms as much as cigarette smoking, new research shows.
Biomembranes enclose biological cells like a skin. They also surround organelles that carry out important functions in metabolism and cell division. Scientists have long known in principle how biomembranes are built up, and also that water molecules play a role in maintaining the optimal distance between neighboring membranes -- otherwise they could not fulfill their vital functions. Now, with the help of computer simulations, scientists have discovered two different mechanisms that prevent neighboring membrane surfaces from sticking together.
Rats born to mothers fed high-fat diets but who get normal levels of fat in their diets right after birth avoid obesity and its related disorders as adults, according to new research. Meanwhile, rat babies exposed to a normal-fat diet in the womb but nursed by rat mothers on high-fat diets become obese by the time they are weaned.
The Mediterranean region is home to numerous museums and historical sites housing metal objects that provide an invaluable window into the past. EU funding enabled development of state-of-the-art corrosion protection and monitoring.
Biomembranes enclose biological cells like a skin. They also surround organelles that carry out important functions in metabolism and cell division. Scientists have long known in principle how biomembranes are built up, and also that water molecules play a role in maintaining the optimal distance between neighboring membranes—otherwise they could not fulfill their vital functions. Now, with the help of computer simulations, scientists of the Technische Universität München (TUM) and the Freie Universität Berlin have discovered two different mechanisms that prevent neighboring membrane surfaces from sticking together. Their results appear in the Proceedings of the National Academy of Sciences.
Scientists have found that calorie restriction -- a diet composed of approximately 30 percent fewer calories but with the same nutrients of a standard diet -- does not extend years of life or reduce age-related deaths in a 23-year study of rhesus monkeys. However, calorie restriction did extend certain aspects of health.
Conservation is concerned with the preservation of biological diversity at all levels, from genes to species, communities and ecosystems. Yet conserving this biological richness is made difficult because it varies in complex ways at different scales of space and time. The problem of scale emerges as a critical new theme in conservation practice.
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