Summary: The infrared absorption spectra of forty strains of sulphate-reducing bacteria have been recorded over the range 1800--800 cm.. It was possible to identify positively and the thermophilic A broad differentiation was possible between salt-water and fresh-water forms of and showed few characteristic differences from the fresh-water strains of 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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