For Activator we have terms and definitions in 3 topics. The topics are Environment, Microbiology and Photography.

A chemical added to a pesticide to increase its activity.
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A regulatory protein that binds to specific sites on DNA and stimulates transcription; an activator is usually involved in the positive control of transcription regulation.
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A solution used in rapid access processors to activate developing agents present in certain emulsions of photographic products.
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