A sulphate-reducing bacterium (strain Norway 4) previously assigned to the species Desulfovibrio desulfuricans has now been found to contain cytochrome c 3 but not desulfoviridin. The organism resembles strains of D. desulfuricans which contain both pigments, in its morphology, nutrition, metabolism and hydrogenase activity. It is considered to be a mutant which has lost desulfoviridin. This work has not revealed the function of desulfoviridin.
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Miller et al. (1964) studied this question.