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. If a little vitamin A is good, more must be better, right? Wrong! New research published online in the FASEB Journal shows that vitamin A plays a crucial role in energy production within cells, explaining why too much or too little has a complex negative effect on our bodies. This is particularly important as combinations of foods, drinks, creams, and nutritional supplements containing added vitamin A make an overdose more possible than ever before. http://www.physorg.com/news174219736.html Medicine & Health Thu, 08 Oct 2009 12:10:03 EST news174219736 Human cells are able to secrete a cancer-killing protein, scientists at the University of Kentucky's Markey Cancer Center have found. http://www.physorg.com/news167579029.html Medicine & Health Thu, 23 Jul 2009 14:44:12 EST news167579029 In a paper publishing online April 23rd in Cell Stem Cell, a Cell Press journal, Dr. Sheng Ding and colleagues from the Scripps Research Institute in La Jolla, California, report an important step forward in the race to make reprogrammed stem cells that may be better suited for use in clinical settings. http://www.physorg.com/news159712519.html Biology Thu, 23 Apr 2009 13:37:54 EST news159712519 Overweight children and adolescents, with the active involvement of their parents and families, can successfully lose weight by following the Seven Steps to Success described in the current issue of Obesity Management, a journal published by Mary Ann Liebert, Inc. http://www.physorg.com/news155483104.html Medicine & Health Thu, 05 Mar 2009 13:45:39 EST news155483104 In plant pollen grains, sperm cells, which carry the genetic material to be passed on to progeny, are cocooned within larger "companion" cells that are called pollen vegetative cells. These companions provide sperm with energy and nourishment, and push them towards their targets during fertilization. http://www.physorg.com/news153064281.html Biology Thu, 05 Feb 2009 13:51:37 EST news153064281 Scientists who study how human chemistry can permanently turn off genes have typically focused on small islands of DNA believed to contain most of the chemical alterations involved in those switches. But after an epic tour of so-called DNA methylation sites across the human genome in normal and cancer cells, Johns Hopkins scientists have found that the vast majority of the sites aren't grouped in those islands at all, but on nearby regions that they've named "shores." http://www.physorg.com/news151508416.html Medicine & Health Sun, 18 Jan 2009 13:40:16 EST news151508416 Scientists at the Centre for Addiction and Mental Health (CAMH) have detected evidence that DNA may not be the only carrier of heritable information; a secondary molecular mechanism called epigenetics may also account for some inherited traits and diseases. These findings challenge the fundamental principles of genetics and inheritance, and potentially provide a new insight into the primary causes of human diseases. http://www.physorg.com/news151507849.html Medicine & Health Sun, 18 Jan 2009 13:30:49 EST news151507849 Researchers at the University of Southern California (USC) have, for the first time in history, derived authentic embryonic stem (ES) cells from rats. This breakthrough finding will enable scientists to create far more effective animal models for the study of a range of human diseases. http://www.physorg.com/news149343895.html Biology Wed, 24 Dec 2008 12:24:55 EST news149343895 Although every cell of our bodies contains the same genetic instructions, specific genes typically act only in specific cells at particular times. Other genes are "silenced" in a variety of ways. One mode of gene silencing depends upon the way DNA, the genetic material, is packed in the nucleus of cells. http://www.physorg.com/news135006119.html Medicine & Health Fri, 11 Jul 2008 14:41:59 EST news135006119