deuterium labeling

 deuterium labeling

 

Deuterium

Deuterium (chemical symbol D or ²H) is a stable isotope of hydrogen, found in extremely small amounts in nature. The nucleus of deuterium, called a deuteron, contains one proton and one  neutron, whereas the far more common hydrogen nucleus contains just one proton and no neutrons. Consequently, each atom of deuterium has roughly twice the  mass of an ordinary hydrogen atom, and deuterium is also called heavy hydrogen. water in which ordinary hydrogen atoms are replaced by deuterium atoms is known as heavy water.

Ref: http://www.newworldencyclopedia.org/entry/Deuterium