Nitrification at low pH by aggregated chemolithotrophic bacteria
作者： W. De Boer , P. J. A. Klein Gunnewiek , M. Veenhuis , E. Bock , H. J. Laanbroek
DOI: 10.1128/AEM.57.12.3600-3604.1991
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摘要: A study was performed to gain insight into the mechanism of acid-tolerant, chemolithotrophic nitrification. Microorganisms that nitrified at pH 4 were enriched from two Dutch acid soils. Nitrate production in enrichment cultures indicated be a chemolithoautotrophic nature as it (i) completely inhibited by acetylene concentration low 1 μmol/liter and (ii) strongly retarded under conditions carbon dioxide limitation. Electron microscopy showed presence bacteria morphologically similar strains known nitrifying genera. Many bacteria, particular those identified ammonium oxidizers, aggregated. Filtration experiments aggregated cells able nitrify pH, whereas single not. It is hypothesized inside aggregates are protected against toxicity nitrous acid. Nitrification may dominating process nitrate formation many soils does not appear depend on existence microsites high (acid-sensitive autotrophic nitrification) or availability organic (heterotrophic nitrification). Images
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