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Description of Chromatiaceae

The phototrophic purple bacteria and make up the purple (or red) sulfur bacteria with the Ectothiorhodospiraceae. Typically grow under anoxic conditions in the light using sulphides as photosynthetic electron donors, oxidizing the substrate to sulfate. Elemental sulphur may accumulate inside the cells. A number of species also can grow under chemotrophic conditions in the dark, either autotrophically or heterotrophically using oxygen as terminal electron acceptor in respiratory processes. Phototrophic growth, photosynthetic pigment synthesis, and internal membrane formation are ihibited by oxygen.

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