Abstract
Johnson, A. H. (Washington State University, Pullman), and J. L. Stokes. Manganese oxidation by Sphaerotilus discophorus. J. Bacteriol. 91:1543–1547. 1966.—Cell suspensions of Sphaerotilus discophorus in 0.02 m potassium phosphate buffer (pH 7.2) readily oxidized MnSO4 to dark-brown manganic oxide. The latter appeared to be MnO2, since its color was the same as MnO2 and, like the latter, it was readily soluble in HCl with the evolution of chlorine. The amount of O2 consumed in the oxidation of Mn++ was 63% or more of theoretical. The ability of the cells to oxidize Mn++ was destroyed by heating the cells at 93 C for 5 min. Only cell suspensions prepared from cultures of S. discophorus grown with MnSO4 were able to oxidize Mn++. It was concluded that the oxidation of manganous ions by S. discophorus is catalyzed by an inducible enzyme(s).
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