Abstract
Addition of cycloheximide to Neurospora crassa germlings growing in liquid medium caused an exponential loss of phosphate uptake activity (half-life, ca. 2 h). No loss of activity resulted when germlings were resuspended, at the time of cycloheximide addition, in medium of a substantially lower phosphate concentration. It is concluded that the phosphate uptake systems are not subject to rapid turnover.
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