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  • Title: The effect of diffusible acids on potassium ion uptake by yeast.
    Author: Ryan H, Ryan JP, O'Connor WH.
    Journal: Biochem J; 1971 Dec; 125(4):1081-5. PubMed ID: 4947295.
    Abstract:
    1. When yeast oxidizes ethanol at different pH values the uptake of K(+) corresponds closely to the amount of acetate accumulated at each pH value. 2. The addition of semicarbazide to the suspension buffered at pH4.75 inhibited both the K(+) uptake and the acetate accumulation by about 50%. 3. The addition of either acetate or propionate to the suspensions markedly increased the K(+) uptake. 4. The addition of acetate to the suspensions lowered the intracellular pH of the yeast from a resting value of pH5.80 to 5.56. 5. The ratio of the initial rate of K(+) uptake to O(2) consumption was 0.77. This ratio was increased to 1.77 in the presence of 10mmol of propionate/l.
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