1887

Abstract

SUMMARY: Cultures of (Waksman, 1922a), strains ‘T’ and ‘K’ (Trautwein, 1921) and and the ‘M’ strains, organisms isolated from concrete (Parker, 1945, 1947), were examined to elucidate the mode of oxidation and to establish the identity of the organisms recently isolated from corroded concrete.

Thiosulphate was oxidized by all these bacteria. and first converted it to tetrathionate and sulphate and then oxidized the tetrathionate to sulphate and free sulphuric acid. differed from the other two in that, owing to a lesser acid tolerance, some tetrathionate was found in the final products of oxidation. converted thiosulphate to sulphate and sulphur, followed by partial oxidation of the sulphur to sulphuric acid. produced sulphate and sulphuric acid. , the ‘T’ and ‘K’ strains and the ‘M’ strains formed sulphate and tetrathionate with temporary increase in pH value; only oxidized tetrathionate, yielding sulphate and sulphuric acid.

Elementary sulphur was oxidized by and ; the rates of oxidation decreased in that order, and the only product was sulphuric acid.

Hydrogen sulphide was oxidized only at low concentrations and only by and ; sulphuric acid was the end-product, and elementary sulphur may have been an intermediate.

differed from in pH range for growth and from in its method of oxidation of thiosulphate, tetrathionate and HS. It appeared to fit earlier descriptions of by Nathansohn (1902) and Beijerinck (1904) more closely than the strain described as by Starkey (1934). The ‘M’ strains were similar to and the ‘T’ and ‘K’ strains of Trautwein.

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1953-06-01
2021-07-26
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