Abstract
The anoxygenic phototrophic bacteria (Anoxyphoto-bacteria Gibbons and Murray 1978) perform photosynthesis with a bacteriochlorophyll (bchl) under anaerobic conditions, using reduced sulfur compounds, molecular hydrogen, or simple organic carbon compounds as electron donors. These bacteria do not use water as a photosynthetic electron donor and do not produce molecular oxygen during photosynthesis. The ability to fix molecular nitrogen occurs in nearly all species tested so far (Siefert, 1976).
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