1887

Abstract

, grown microaerobically in batch culture, showed much higher uptake hydrogenase activity in N-fixing than in NH -grown cultures. Hydrogenase synthesis was induced by H under a low partial pressure of O and under air, in autotrophic as well as in heterotrophic conditions, provided that the sucrose concentration was relatively low. Sucrose at 15 m repressed hydrogenase formation but did not inhibit preformed activity. Other utilizable carbon substrates repressed, while non-utilizable substrates did not repress, hydrogenase synthesis. The activity, unlike nitrogenase, was not sensitive to O but hydrogenase synthesis was partially repressed by O.

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1988-04-01
2021-05-12
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