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. A Canadian nuclear reactor that produced about a third of the world's supply of medical isotopes has halted operation for three months due to a heavy water leak, authorities said. http://www.physorg.com/news162708897.html Medicine & Health Thu, 28 May 2009 05:55:18 EST news162708897 (PhysOrg.com) -- The nuclei of ordinary hydrogen atoms contain only a single proton. If a neutron is added, the hydrogen becomes deuterium. In principle, molecules that contain deuterium in place of hydrogen atoms are chemically identical. However, there can be significant differences. Thus `heavy water`, water with molecules that contain deuterium in place of hydrogen, is toxic because it disrupts highly sensitive biochemical processes in the body and leads to metabolic failure. http://www.physorg.com/news150561487.html Chemistry Wed, 07 Jan 2009 14:38:07 EST news150561487 Scientists know that light water (H2O) and heavy water (D2O) have similar but not identical structures. Using quantum mechanics, researchers have recently identified several differences between the two water isotopes that previous research had not predicted. http://www.physorg.com/news138962912.html Physics Tue, 26 Aug 2008 09:48:32 EST news138962912