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1. Chem a substance added in small amounts to a catalyst to increase its activity
2. Genetics a sequence of nucleotides, associated with a structural gene, that must bind with messenger RNA polymerase before transcription can proceed



a substance added to a catalyst in order to increase its activity, selectivity, or stability. A promoted catalyst is usually a catalyst containing a small amount of a promoter that by itself is catalytically inactive or only slightly active. In the case where the promoter is not inactive, the addition creates a mixed catalyst. Often an additive, given certain external conditions, concentrations, and methods of addition, acts as a promoter, whereas under different conditions the same additive serves as a catalyst poison. Most commercial catalysts belong to the promoted category. For example, V2Os, the catalyst which speeds up the oxidation of SO2 into SO3, is promoted by the oxides of alkali metals; metallic Fe, which catalyzes the synthesis of ammonia, is promoted by the oxides of aluminum, calcium, potassium, and other metals. The mechanism involved in the activity of promoters is explained by modern theories of catalysis.


A chemical which itself is a feeble catalyst, but greatly increases the activity of a given catalyst.
The site on deoxyribonucleic acid to which ribonucleic acid polymerase binds preparatory to initiating transcription of a gene or an operon.


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.
References in periodicals archive ?
The promoters will infuse net proceeds into DLF, which in turn will use the amount to reduce its debt significantly from the current Rs 27,000 crore.
Some criteria for evaluation of promoters have to be decided.
Last year, Macedonia had 23 promoters on whose salaries over a million euros were spent.
Genomic promoters are segments of DNA that determine the expression patterns for genes.
Textile and other industry enjoy exemptions of tax but overseas promoters have been taxed.
Asia-Pacific is the largest regional segment in the adhesion promoters market"
PROMOTERS are generally the biggest shareholders in their companies.
We bring you a few stocks recommended by experts in which promoters have increased the stake.
The bank said, 'While the Late Ashok Kapur, was indeed a co-promoter with established bonafide, basis the deliberation and expert advice, it is abundantly clear that financial family successors do not automatically become part of the promoter Group given the regulatory criteria for bank promoters'.
com in the United States to give event promoters, venues, and festival organizers all the tools they need to manage, promote, and sell event tickets, just like the big event promoters do, except without the high service and convenience fees that are passed onto ticket patrons.
Some of the promoters we've identified have criminal backgrounds.