http://www.physorg.com/ en-us Physorg.com internet news portal provides the latest news on science including: Physics, Nanotechnology, Life Sciences, Space Science, Earth Science, Environment, Health and Medicine. For the first time, researchers have described hour-by-hour changes in the amount of amyloid beta, a protein that is believed to play a key role in Alzheimer's disease, in the human brain. A collaborative team of scientists at Washington University School of Medicine in St. Louis and the University of Milan report their results this week in Science. http://www.physorg.com/news139151270.html Medicine & Health Thu, 28 Aug 2008 14:07:50 EST news139151270