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单词 sigma factor
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sigma factor
sigma factor n. Biochemistry a component of RNA polymerase which determines where transcription begins.
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sigma factor1969
1969 R. R. Burgess et al. in Nature 4 Jan. 44/2 GG enzyme contains, in addition, two extra bands which we shall designate σ and τ.
1969 R. R. Burgess et al. in Nature 4 Jan. 46/1 The presence of the stimulating factor, σ, greatly enhances the amount of RNA synthesis.
1969 R. R. Burgess et al. in Nature 4 Jan. 46/2 σ and similar factors could..act as positive control elements regulating the amount of synthesis of different classes of RNA.]
1969 Times 9 May 12/6 The sigma factor helps to specify which genes are expressed.
1970 Nature 29 Aug. 886/1 Today sigma factor proteins..are central to all attempts to explain the positive control of gene expression.
1976 Proc. National Acad. Sci. U.S.A. 73 3961 (heading) Purification and characterization of a putative sigma factor from Chlamydomonas reinhardi.
1976 Proc. National Acad. Sci. U.S.A. 73 4405 (heading) Induction of sigma factor synthesis in Escherichia coli by the N gene product of bacteriophage lambda.
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