PuSH - Publication Server of Helmholtz Zentrum München: Diazotrophic growth of <em>Rhodopseudomonas acidophila</em> and <em>Rhodopseudomonas capsulata</em> under microaerobic conditions in the dark.

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Siefert, E. ; Pfennig, N.

Diazotrophic growth of Rhodopseudomonas acidophila and Rhodopseudomonas capsulata under microaerobic conditions in the dark.

Arch. Microbiol. 125, 73-77 (1980)

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Diazotrophy of Rhodopseudomonas acidophila and Rhodopseudomonas capsulata was not obligatorily linked to photosynthesis. In the dark R. acidophila grew with dinitrogen as sole nitrogen source at a dissolved oxygen tension of 15 Torr (= 2.0 kPa); the doubling time was 8 h. Acetylene reduction by whole cells was more sensitive to oxygen in the light than in the dark. 16.5 mg N₂ were fixed per g lactic acid consumed. R. capsulata synthesized nitrogenase and fixed dinitrogen in the dark at a dissolved oxygen tension of less than one Torr (= 0.13 kPa). The doubling time of this bacterium was 16 h and 10.5 mg N₂ were fixed per g lactic acid consumed.

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