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Studies on thiobacillus denitrificans

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Summary

Experiments with T. denitrificans have shown that this bacterium cannot develop in media devoid of ammonium salts, and that iron is required for growth. Pure cultures have been isolated by means of a modified medium which permits rapid growth in serial transfers. The organism has been characterized as an obligatory chemoautotroph which can oxidize a number of inorganic sulfur compounds (elementary sulfur, thiosulfate, tetrathionate) either aerobically with O2, or anaerobically with nitrate as oxidant.

Nitrite was found to be highly toxic to the nitrate-reducing enzyme system; concentrations as low as 3.5 · 10-4 m inhibit denitrification in the presence of sulfur about 40%. In the presence of thiosulfate, nitrite is rapidly decomposed to NO; this gas can subsequently be used as an oxidant, and is reduced to N2. The formation of NO depends on the presence of both thiosulfate and nitrite.

With resting cell suspensions CO2 assimilation has been established; the assimilation products are not merely carboxylation products, as demonstrated in experiments with C14O2.

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Author notes

  1. Kjellrun S. Baalsrud

    Present address: Biological Laboratory, University of Oslo, Oslo, Norway

Authors and Affiliations

  1. Hopkins Marine Station of Stanford University, Pacific Grove, Calif.

    K. Baalsrud & Kjellrun S. Baalsrud

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  1. K. Baalsrud
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Baalsrud, K., Baalsrud, K.S. Studies on thiobacillus denitrificans. Archiv für Mikrobiologie 20, 34–62 (1954). https://doi.org/10.1007/BF00412265

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