Abstract
The ζ potential of yeast cells shows a sudden decrease as the osmotic value of the medium is increased from 1.1 to 1.8 osmol. Above or below these values hardly any change in the ζ potential is observed. This decrease occurs by approximation in the range of osmotic values at which plasmolysis takes place. The surface potential of the yeast probed with 9-aminoacridine on the other hand does not change appreciably over the entire range of osmotic values used. The monovalent cation uptake rate declines gradually as the osmotic value of the medium increases. This seems to be caused by a concomitant rise in cellular K + which leads to a drop in the maximal uptake rate of monovalent cations. The K m of the monovalent cation uptake system is not changed by plasmolysis.
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