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Abstract
Summary: The infrared absorption spectra of forty strains of sulphate-reducing bacteria have been recorded over the range 1800--800 cm.-1. It was possible to identify positively Desulfovibrio gigas and the thermophilic Desulfotomaculum nigrificans. A broad differentiation was possible between salt-water and fresh-water forms of Desulfovibrio desulfuricans. Desulfotomaculum orientis and D. ruminis showed few characteristic differences from the fresh-water strains of D. desulfuricans but there was an indication that, with a more refined technique, at least one of the features otherwise characteristic of the other (thermophilic) desulfotomaculum species might be discerned. The results support to a considerable extent current views on the classification ofthe sulphate-reducers.
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