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The activity of the Escherichia coli K+ transport system TrkA was measured as a function of the cytoplasmic pH of the cell. For this purpose, pHin was decreased by the addition of the weak acids acetic acid, benzoic acid or salicylic acid to K+-depleted cells. Under these conditions, the initial rate of K+ uptake decreased strongly with pHin, and was almost(More)
The influence of K+ ions on the components of the transmembrane proton motive force (delta mu H+) in intact bacteria was investigated. In K+-depleted cells of the glycolytic bacterium STreptococcus faecalis the addition of K+ ions caused a depolarization of the membrane by about 60 mV. However, since the depolarization was compensated for by an increase in(More)
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