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The l~ffect of isopropylthloe;alactoside on the Indu.ction .or the Galactose Operon· by D-Fucose 1n a Lactose Deletion · r-lu.tant · of Escr.erichia ££ll. D. C. H. McB:rlen & v. !l.tOses •.. · B:'1.ocherr:t. J .. La~<1rence Radiati.on Laboratory.· Univers~ty. ~f Cal1forn:1.a,··. Berkeley, ca!iror.n1~. The·. gr-atuitous induction of the galactose operon in.· F.scherichia. coli by 5 X 10~3 M D-fucos~ 1~' shO'Iln to be in.. i · h1b1ted by 43% in. the presence of an equi!TX)lar concentration ,. or 1sopropyl-e-~thiog-a.lactos1de in· a mutant or the bacterium lacld..ng the lactose operon. This result is compar~d td th . results .obtained· by othet~ workers usillg. strains of the. bac. ' teri~ \dtp ;COmplete genetiC apparatus Snd 'PoSSible mechanisms ···or the inhibition ·ax-e discl.issed. · .·

Effect of isopropylthiogalactoside on induction of the galactose operon by D-fucose in a lactose deletion mutant of Escherichia coli