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• W2015702657 abstract "The physiological effects on brewing yeast, growing in semi-defined wort medium, of a sudden transition from aerobiosis to anaerobiosis were studied. Two yeast strains were examined, used for ale and lager fermentations respectively. The reverse transition (from anaerobiosis to aerobiosis) was also examined. Transitions were applied by changing the sparging gas during growth or in stationary phase, and the effects on the specific activities of certain key enzymes and on the viability of the cultures were examined. Neither type of transition led to significant changes in growth rate, the rate of ethanol production or the specific activities of alcohol dehydrogenase and pyruvate decarboxylase. The most significant change was in the specific activity of CuZn-superoxide dismutase, which showed a rapid increase in activity on transition from anaerobiosis to aerobiosis, and a decrease in activity on the reverse transition. Catalase activity in the ale yeast generally followed that of CuZn-superoxide dismutase, whereas in the lager yeast it remained unchanged by the transitions. The transition from anaerobiosis to aerobiosis caused increases in citrate synthase and Mn-superoxide dismutase, though only after a significant lag period. Aerobic to anaerobic transitions caused a decrease in Mn-superoxide dismutase activity, while citrate synthase remained unchanged. Anaerobically grown cells showed a rapid loss in viability on exposure to oxygen (5–7% in the first hour), while aerobically grown cells were unaffected. When anaerobically grown cells were exposed to 0·25 mM-potassium superoxide, there was an 8% loss of viability within 10 min, whereas aerobic cells were not affected. It is concluded that the toxic effect of oxygen is due to superoxide (or a species derived from it) and that the CuZn-superoxide dismutase (but not the Mn-isoenzyme) plays a role in protecting the cells. The de novo synthesis of the CuZn-enzyme is not always rapid enough to confer full protection." @default.
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• W2015702657 date "1991-02-01" @default.
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• W2015702657 title "Synthesis of superoxide dismutase, catalase and other enzymes and oxygen and superoxide toxicity during changes in oxygen concentration in cultures of brewing yeast" @default.
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• W2015702657 doi "https://doi.org/10.1002/yea.320070203" @default.
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