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. The control of spider mites, which damage tree leaves, reduce fruit quality and cost growers millions of dollars in the use of pesticide and oil spraying, is being biologically controlled in Pennsylvania apple orchards with two tiny insects known to be natural predators, according to Penn State researchers. http://www.physorg.com/news176400324.html Biology Mon, 02 Nov 2009 16:50:01 EST news176400324 Natural killer, or NK cells, are part of our innate immune system. A healthy body produces them to respond early during infection. They are activated and they kill cells infected with a given virus. http://www.physorg.com/news173622784.html Medicine & Health Thu, 01 Oct 2009 13:50:03 EST news173622784 (PhysOrg.com) -- The mechanism used by 'Natural Killer' immune cells in the human body to distinguish between diseased cells, which they are meant to destroy, and normal cells, which they are meant to leave alone, is revealed in new detail in research published today in PLoS Biology. http://www.physorg.com/news167989314.html Medicine & Health Tue, 28 Jul 2009 09:30:01 EST news167989314 Half of the immune system has a hidden talent, researchers at Washington University School of Medicine in St. Louis have discovered. http://www.physorg.com/news152212893.html Medicine & Health Mon, 26 Jan 2009 17:21:53 EST news152212893 (PhysOrg.com) -- One of the most promising new ideas about the causes of cancer, known as the cancer stem-cell model, must be reassessed because it is based largely on evidence from a laboratory test that is surprisingly flawed when applied to some cancers, University of Michigan researchers have concluded. http://www.physorg.com/news147532400.html Medicine & Health Wed, 03 Dec 2008 13:13:20 EST news147532400