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activator |
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activator [′ak·tə‚vād·ər]
(chemistry) A substance that increases the effectiveness of a rubber vulcanization accelerator; for example, zinc oxide or litharge. A trace quantity of a substance that imparts luminescence to crystals; for example, silver or copper in zinc sulfide or cadmium sulfide pigments. (genetics) A molecule that modifies a repressor in a way that enables it to stimulate operon transcription. (graphic arts) catalyst 1. A substance which accelerates a chemical reaction but appears to remain unchanged itself. 2. A hardener that accelerates cure of adhesives either with or without heat. Used primarily with synthetic resins. Want to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit the webmaster's page for free fun content. |
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