Abstract
Acidification power, defined as the sum of the spontaneous pH change determined after suspending yeast cells in water and the substrate-induced pH change after addition of glucose to the resulting suspension, reflects the level of cellular energy sources. Its use as an indicator of metabolic state of the cells was tested during a 120-h aerobic starvation. Its changes coincided with changes in cell viability, initial rate of endogenous oxygen consumption rate, cell ATP, extra- and intracellular buffering capacity, and the ability of cell-free extract to produce acidity by glucose fermentation. It was used as a sensitive marker of metabolic changes occurring during starvation, on treatment with glycolytic and respiratory inhibitors, and at elevated temperature.
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