Summary: The effects of about 200 bacteriostatic and bactericidal agents on sulphate reducing bacteria, including some hitherto unpublished results, are tabulated.
SUMMARYA sulphate-reducing bacterium (strain Norway 4) previously assigned to the species Desulfovibrio demlfuricans has now been found to contain cytochrome cs 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.
SUMMARYForty-five strains of sulphate-reducing bacteria showed marked differences in their resistance to Hibitane (I.C.I. Ltd.) and, to a lesser degree, to cetyltrimethylammonium bromide. Panacide (British Drug Houses Ltd.) was effective against all the strains. The relevance of these findings to modern views on the taxonomy of the sulphate-reducers and to the problem of inhibiting these organisms in the field is discussed.
SUMMARYThe infrared absorption spectra of forty strains of sulphate-reducing bacteria have been recorded over the range 1800-800cm.-1. It was possible to identify positively Desulfovibrio gigas and the thermophilic Desulfotomaculum nigrijcans. A broad differentiation was possible between salt-water and fresh-water forms of Desulfovibrio desulfuricam. 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 of the sulphate-reducers.
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