The cytoplasmic membrane isolated from cells of Citrobacter freundii growing in a cultivation medium with glucose was found to exhibit a decreased ability to oxidize formate and succinate and a decreased activity of formate, succinate and lactate dehydrogenase as compared with the cytoplasmic membrane of cells growing on galactose. The activation energy for dehydrogenation and oxidation of succinate simultaneously increases. The quantitative content of cytochromes and quinones in both types of membranes does not differ considerably. The two types of membranes also do not mutually differ in the qualitative and quantitative representation of fatty acids in lipids and in the sensitivity to the effect of low concentrations of detergents. The mass ratio of proteins and lipids is lower in the membranes of cells grown on glucose.

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