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(biology) any agency bringing about activation; a molecule that increases the activity of an enzyme or a protein that increases the production of a gene product in DNA transcription
a substance that retards or stops an activity
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(mineral extraction) a surface-active chemical used in flotation process to increase the attraction to a specific mineral
(chemistry) a substance that initiates or accelerates a chemical reaction without itself being affected
(chemistry) a substance other than a catalyst that facilitates the start of a catalytic reaction
a biochemical catalyst such as an enzyme
any of several complex proteins that are produced by cells and act as catalysts in specific biochemical reactions
a fine black powder of platinum; used as a catalyst in chemical reactions
the real physical matter of which a person or thing consists
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