Abstract
Strains related to Hydrogenobacter, a genus of thermophilic, obligatorily chemolithoautotrophic bacteria, were able to utilize elemental sulfur or thiosulfate, as well as molecular hydrogen, as sole electron and energy source. Extracellular elemental sulfur was produced as an intermediate during oxidation of thiosulfate. Growth with thiosulfate alone was strongly microaerophilic, whereas no hydrogenase activity was detected. Mixolithotrophic growth with both hydrogen and thiosulfate was faster than with hydrogen alone, and the cells harbored a hydrogenase activity comparable to that of cells grown under hydrogen without thiosulfate.
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