SAN FRANCISCO--Elite athletes sometimes push themselves so hard while training that their performance begins to suffer. Now a physiologist has measured the toll this overtraining can take on athletic ability, the immune system, and mood.
Scientists have tweaked the structure of a protein so that it gets blood to clot 50 times faster than it normally does. The advance, described in the current issue of the Proceedings of the National Academy of Sciences, could lead to more powerful and cheaper treatments for hemophilia.
Last February, the idea that it's advantageous for human females to live long after menopause so they can help feed their grandchildren--a notion taken from studies of African hunter-gatherers--captured public attention.
Reading the lay of the land can lead biologists to biodiversity hotspots. Landscapes with great variation in slope, soil, and other characteristics tend to shelter more species than do featureless areas, according to two studies appearing in the current issue of Conservation Biology.
WASHINGTON, D.C.--The U.S. State Department has compiled a secret list of 20 Russian research institutes suspected of helping Iran's missile program and is restricting the flow of U.S. research funds to some of those institutes.
SAN FRANCISCO--Although AIDS patients have been told to avoid strenuous exercise, results of a study announced here yesterday at the Experimental Biology '98 meeting show that they can undertake a major workout without boosting their HIV viral count.
Scientists have used gene therapy to sharply reduce joint swelling from arthritis in rabbits. The finding, reported in this week's Proceedings of the National Academy of Sciences, could someday lead to a novel treatment for inflamed joints in people.
Researchers know well the terrible progression from HIV infection to AIDS, but they're less clued in to how the virus gets a toehold in the body. The virus--which attacks immune cells called CD4 T lymphocytes--shows up early on in the lymph nodes.
Solar power enthusiasts have long dreamed of replacing fossil fuels with clean-burning hydrogen gas. Although solar cells can be harnessed to rip apart the hydrogen and oxygen in water molecules, the cells haven't been economical.
Like the waistband in your favorite old pajamas, overstressed hearts often lose their elasticity and their ability to pump blood efficiently--a condition called congestive heart failure. The tired hearts are prone to arrhythmias that cause sudden death.
Air traffic controllers and emergency dispatchers must make critical decisions while being deluged with information. Now researchers have devised a test that accurately measures the cool, quick judgment needed to perform well under stress.
A cheaper, lighter version of the lithium batteries used in laptop computers and cellular phones may soon become available. Researchers have found a way to replace cobalt--the most expensive component of these batteries--with aluminum.
NEW DELHI, INDIA--A new wheat variety that yields a whopping 18 tons per hectare was unveiled here yesterday at a conference sponsored by the International Wheat and Maize Improvement Center (CIMMYT) in Mexico.