Abstract
To non-growing suspensions of baker's yeast at pH 5·5 were added varying amounts of the cationic surfactant, benzalkonium chloride. The percentage of cells stained by Nile Blue dye in the presence of calcium chloride, the percentage of potassium lost from the cells, the percentage inhibitions of rates of anaerobic glucose utilization and CO 2 production, and the decarboxylation of exogenous pyruvate (as percentage of maximal rate of decarboxylation) were found to be equal for any given surfactant concentration in the range of concentrations used. Results were interpreted as an all-or-none phenomenon for individual cells in suspension, i.e. as the concentration of surfactant was raised, greater numbers of cells simultaneously released all or nearly all of their potassium, ceased fermenting, and commenced to decarboxylate pyruvate. The results are discussed.
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