Humans have drastically changed many rivers by impoundments and diversions to meet the needs of water, energy and transportation. Such exploitation belongs among the most dramatic, deliberate impacts that humans have had on the natural environment. Many of the ecological effects of dams are relatively well known. Despite this fact, there has so far not [...]

Eckburg works with David Relman, MD, associate professor of medicine (infectious diseases and geographic medicine) and of microbiology and immunology. Relman’s lab at the Veteran Affairs Palo Alto Heath Care System specializes in microbial pathogen discovery and human microbial ecology, and in appreciating the roles played by microbes in human health and disease. The paper [...]

Eckburg works with David Relman, MD, associate professor of medicine (infectious diseases and geographic medicine) and of microbiology and immunology. Relman’s lab at the Veteran Affairs Palo Alto Heath Care System specializes in microbial pathogen discovery and human microbial ecology, and in appreciating the roles played by microbes in human health and disease. The paper [...]

In the best popping kernels, the pericarp is composed of a stronger, more highly ordered crystalline arrangement of the cellulose molecules than the pericarp of the poorer performing varieties, according to Hamaker and crystallographer Rengaswami Chandrasekaran, one of the team members. In laboratory studies, the researchers demonstrated that these stronger crystalline structures tend to maximize [...]

Dr Thomas developed a model with colleagues at University of California Los Angeles (UCLA), which uses a recently discovered phase change (when atoms are compressed into crystals under high pressure) in the lowest part of the Earth’s mantle. They propose that temperature changes in this area can result in the creation of two seismic layers [...]