Bacillus schlegelii, a New Species of Thermophilic, Facultatively Chemolithoautotrophic Bacterium Oxidizing Molecular Hydrogen

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Abstract
A thermophilic, facultatively chemolithoautotrophic bacterium oxidizing molecular hydrogen was isolated. It formed round, terminal endospores and had a multilayered cell wall. Although growth rates were highest under autotrophic conditions, certain organic chemicals, including short-chain fatty acids, some amino acids, 1-propanol and phenol, could serve as sole C and energy sources; ammonium ions, urea and L-asparagine could serve as sole N sources. The hydrogenase was membrane-bound and did not reduce NAD(P). The guanine + cytosine content of its DNA was 67-68 mol%. Based on its morphological and biochemical features, the organism belongs to Bacillus, but differs from any of the previously described species attributed to this genus. It is proposed as constituting a new species, B. schlegelii, named after the German microbiologist H.G. Schlegel. The type strain of B. schlegelii, strain MA48, was deposited with the German Collection of Microorganisms under the accession number DSM 2000.

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