Promoter

Name:
Promoter
Detailed information:
(1) A substance that, when added in relatively small quantities to a catalyst, increases its activity, e.g., aluminum and potassium oxide are added as promoters to the iron catalyst used in facilitating a combination of hydrogen and nitrogen to form ammonia. (2) In ore flotation, a substance that provides the minerals to be floated with a water-repellent surface that will adhere to air bubbles. Such reagents are generally more or less selective toward minerals of certain classes. (3) /H The first few hundred nucleotides of DNA “upstream” (on the 5′ side) of a gene, which control the transcription of that gene. The promoter is part of the 5′ flanking DNA, i.e. it is not transcribed into RNA, but without the promoter, the gene is not functional.