Definition: Any form of chlorophyll in photosynthetic bacteria: 1) bacteriochlorophyll a, —CH=CH2 replaced by —CO—CH3 in the chlorophyll α structure, two hydrogens also being added; the photosynthetic pigments of purple bacteria; 2) bacteriochlorophyll b, —CH=CH2 replaced by —CO—CH3 and —CH2—CH3 replaced by —CΞCH in the chlorophyll β structure, two hydrogens also being added.
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