1887

Abstract

The unicellular cyanobacterium sp. PCC 6909 was grown diazotrophically in continuous culture. Various light-dark regimes and dilution rates were applied. Nitrogenase activity (acetylene reduction), oxygen-production and -consumption, and glycogen were measured over 24 h periods covering one complete light-dark cycle. fixed nitrogen predominantly in the light, concomitant with photosynthetic oxygen evolution. This result was found irrespective of the imposed light-dark regime or dilution rate. It is concluded that temporal separation of photosynthesis and nitrogen fixation is not obligatory in .

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1991-08-01
2021-05-16
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