in bioprocessing, a substance, usually an enzyme, that activates or increases the rate of a chemical reaction in a living organism. Biocatalysts are currently used in industry in the production of high fructose corn syrup, semi-synthetic penicillins and cancer drugs. [Source: Biotechnology Industry Organization, www.bio.org
a substance, such as an enzyme or hormone that activates or speeds up a biochemical reaction
A substance that acts to promote or modify some physiological process, especially an enzyme, vitamin or hormone.
a substance that accelerates or modifies a physiological process