Arid Australian interior linked to landscape burning by ancient humans
... south from Asia, only about 13 inches of rain now falls on the continent's interior each year, said Miller, also a CU-Boulder geological sciences professor. Lake Eyre, a deep-water lake in the continent's interior that was filled by regular monsoon rains about 60,000 years ago, is now a huge salt flat th...Surprising study reveals how cancer-causing protein activates
...licate and migrate. In adulthood, STAT3 presumably falls dormant, but its unexpected and continuous activation causes breast and prostate cells to develop and move through the body. Eugene Chin, M.D., a Rhode Island Hospital researcher and assistant professor (research) of surgery at Brown Medical School, ...Body's biological clock found to affect cardiac rhythm patterns in healthy adults
... temperature, Shea notes, rises during the day and falls at night even when a person doesn't sleep at night. The circadian cycle usually "resets" itself daily in response to certain external cues, most especially bright light, such as sunlight. To remove any influence from the sleep/wake cycle, Shea and h......bstances so that their concentration in the fungus falls below the lethal dose. Schoonbeek studied the genes involved in the secretion of toxic substances by ABC transporters. He discovered that the activity of the pumps was partly controlled by the toxic substances. Upon entering the fungus, these stimul...Human gland probably evolved from gills
... hormone if the calcium concentration in the blood falls too low. This hormone then causes the release of calcium from bone, and increases its reuptake in the kidney, raising the calcium levels back to normal. Fish don't have parathyroid glands. Instead they increase their internal calcium concentration b...Study gives US a 'C' for lagging support of international reproductive health and population efforts
...e U.S. economy is accounted for, however, the U.S. falls to 11th place. The U.S. does even worse when it comes to overall development assistance, devoting only.13 percent of its gross national income in 2002, in stark contrast to the Netherlands' .81 percent of GNI. In terms of policy, the Bush administra...Fragmented habitats no ultimate refuges for forest-dwelling tropical birds
...our feet of rain a year and it's warm and the rain falls in every month you're going to have lush tropical foliage." They estimated how many varieties of birds lived in the region before deforestation by consulting available records and superimposing maps of the known ranges of tropical species. Dissatisfi......itions. Out of billions of cells, not a single one falls into chaos. How can order be maintained? A question that scientists have been pondering since the 1960s may now have been answered by theoretical physicists at Lund University. In the most recent issue of the Proceedings of the National Academy of S......s. (3) The diffusion wave model falls between the other two theories. Like the replacement theory, it says modern humans arose in Africa and spread across the world, Rogers says. Like the multiregional theory, it says those early humans mated with humans elsewhere. The diffusion wave the...