David Rittenberg
Encyclopedia
David Rittenberg was a U.S.
United States
The United States of America is a federal constitutional republic comprising fifty states and a federal district...

 biochemist
Biochemist
Biochemists are scientists who are trained in biochemistry. Typical biochemists study chemical processes and chemical transformations in living organisms. The prefix of "bio" in "biochemist" can be understood as a fusion of "biological chemist."-Role:...

 who pioneered the radioactive tagging of molecule
Molecule
A molecule is an electrically neutral group of at least two atoms held together by covalent chemical bonds. Molecules are distinguished from ions by their electrical charge...

s, enabling detailed studies of metabolism
Metabolism
Metabolism is the set of chemical reactions that happen in the cells of living organisms to sustain life. These processes allow organisms to grow and reproduce, maintain their structures, and respond to their environments. Metabolism is usually divided into two categories...

. These studies resulted in a change in the prevailing scientific dogma, from a static, 'wear and tear' view of metabolic processes, to a dynamic theory in which constant and rapid build up and degradation of body constituents takes place.

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