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- W1543161757 abstract "The coulokinetic technique, a method by which the capacity factor (coutombic output) of a biological system to perform electrical work is measured, has been applied to further investigations on β-galactosidase induced and repressed Escherichia coli systems. The results indicate that methyl-β- D -thiogalactopyranoside (TMG), in addition to its known action as an inducer of the β-galactosidase operon, is a metabolic inhibitor for the metabolism of glucose, galactose and lactose. Inhibition of galactose metabolism by TMG is significantly less in bacteria grown in the presence of lactose (coli- L ), an inducer of β-galactosidase, than in those cells grown on glucose which represses β-galactosidase formation. One explanation for the relatively slight inhibition of galactose metabolism in coli- L is that as galactose causes a rapid rate of efflux of TMG from the bacterial cell, the TMG remains For too short a period within the cell to compete with the metabolism of galactose which proceeds at a rapid rate because of the presence, in high concentrations, of the necessary enzymes, i.e. galactokinase etc., for its metabolism. In Instances where enzyme induction is not required for metabolism, e.g. glucose when metabolized by glucose-grown E. coli . phenethyl alcohol enhances the coulombic output. The reason for this observation is the increase in cell membrane porosity attributable to the presence of the phenethyl alcohol. Since the Induction of the β-galactosidase operon is required for the metabolism of lactose by glucose-grown E. coli , a completely suppressed coulombic output is obtained in the presence of phenetbyl alcohol." @default.
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- W1543161757 date "1968-01-01" @default.
- W1543161757 modified "2023-09-25" @default.
- W1543161757 title "Cellular electrophysiology" @default.
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- W1543161757 doi "https://doi.org/10.1016/0303-2647(68)90035-x" @default.
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