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. (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