Rhodospirillum rubrum

Rhodospirillum rubrum
A purple nonsulphur bacterium with a spiral shape; contains the pigment bacteriochlorophyll and under anaerobic conditions photosynthesises using organic compounds as electron donors for the reduction of carbon dioxide. The purple colour results from the presence of carotenoids, though the bacteria are often more red or brown.

Dictionary of molecular biology. 2004.

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