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. 1995 Oct;61(10):3604–3608. doi: 10.1128/aem.61.10.3604-3608.1995

The relationship between viability and intracellular pH in the yeast Saccharomyces cerevisiae.

T Imai 1, T Ohno 1
PMCID: PMC167657  PMID: 7486996

Abstract

The relationship between viability (cell proliferation activity) and intracellular pH in the yeast Saccharomyces cerevisiae was investigated by using cells that had been deactivated by low-temperature storage, ethanol treatment, or heat treatment. The intracellular pH was measured with a microscopic image processor or a spectrofluorophotometer. At first, the intracellular pH measurements of individual cells were compared with slide culture results by microscopic image processing. A clear correlation existed between the proliferation activity and intracellular pH. Moreover, by spectrofluorophotometry analysis, it was found that there was a relationship between the viability and intracellular pH of brewing yeast under conditions of low external pH (n = 15, r = 0.960, P = 0.001). This relationship was also observed in baker's yeast (n = 13, r = 0.950, P = 0.001). On the other hand, when the fluorescein staining method was used in these experiments, the relationship between viability and staining percentage was not observed. From these results, intracellular pH was found to be a sensitive factor for estimating yeast physiology. The possible role of cell deterioration is also discussed.

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Selected References

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