Abstract
The rate of fermentation of glucose by a polyploid strain of Saccharomyces cerevisiae growing in a defined salts medium depends on the availability of NH4++. Its decline after exhaustion of the nitrogen source corresponded with the ability of the cells to accumulate the glucose analogue 2-deoxyglucose. Addition of NH4++to a nitrogen-depleted culture stimulated both glucose utilization and 2-deoxyglucose uptake. Since stimulation was inhibited by cycloheximide, maintenance of glucose transport during fermentation is dependent on protein synthesis.
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