purple sulfur bacteria
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purple sulfur bacteria[′pər·pəl ′səl·fər bak‚tir·ē·ə]
Any of various anaerobic photosynthetic purple bacteria, especially in the family Thiorhodaceae, that utilize H2 S and other inorganic sulfur compounds as a source of hydrogen, while the carbon source can be carbon monoxide.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.