1887

Abstract

When grown in alternating cycles of light and darkness, non-synchronous cultures of fixed N mainly in the dark phase. This diurnal pattern of N fixation was independent of the doubling time (69 ± 16 h) of the organism and, since cell division was asynchronous, N fixation does not seem to be confined to a specific phase in the cell cycle. Fluctuations in the rate of N fixation coincided with similar fluctuations in the rate of nitrogenase synthesis. Diurnal fluctuations also occurred in the utilization of glucan and acid-soluble polyphosphate and in the ADP/ATP ratio. Based on these observations, it is proposed that specific metabolic changes are involved in the regulation of the diurnal pattern of N fixation by

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1988-12-01
2021-07-23
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