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The zeta potential of Lactobacillus acidophilus CRL 640, a measure of the net distribution of electrical charges on the bacterial surface, is a function of the glucose concentration in the growing media. With 2% glucose, cells in the stationary phase showed a zeta potential of −45 ± 2 mV. With these cells, the zeta potential after freezing and thawing decreased to −32 ± 2 mV and there was a decrease...