Abstract
A stable mixed bacterial culture was obtained by chemostat enrichment using dimethyl-sulphoxide as a carbon and energy source. This culture could not only rapidly oxidize dimethyl-sulphoxide but also dimethyl-sulphide. Enzyme determinations indicated that an important part of it consisted of methylotrophs, which assimilated carbon via the serine pathway. Indeed plate counts revealed the majority of the community to be a Hyphomicrobium species. This organism, designated Hyphomicrobium EG, is an obligate methylotroph which can only grow aerobically on several different C1-compounds. Its performance on dimethyl-sulphoxide was compared with that of the community and of another recently isolated strain, Hyphomicrobium S. The mixed culture, Hyphomicrobium EG and Hyphomicrobium S had a μmax of 0.08, 0.08 and 0.014 h-1 respectively. The KS for dimethyl-sulphoxide was the same for all three cultures (3–6 μM), whereas that for dimethyl-sulphide of Hyphomicrobium EG after growth on dimethyl-sulphoxide was 3-fold higher than that of the other two cultures (48 and 16 μM respectively). After growth on dimethyl-sulphide it improved to 3 μM. Dimethyl-sulphide respiration was maximal at a concentration of 100 μM; higher concentrations were inhibitory. One of the accompanying organisms, a pink methylotroph, was able to derive energy from the oxidation of thiosulphate. Available cultures of Thiobacillus MS1 that were reported to be able to utilize dimethyl-sulphide could no longer metabolize this compound.
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Suylen, G.M.H., Kuenen, J.G. Chemostat enrichment and isolation of Hyphomicrobium EG. Antonie van Leeuwenhoek 52, 281–293 (1986). https://doi.org/10.1007/BF00428640
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DOI: https://doi.org/10.1007/BF00428640