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1 Portland State University, Department of Biology, Portland, OR 97201, USA
2 Department of Microbiology, College of Biological Science, University of Guelph, Guelph, Ontario, Canada N1G 2W1
Correspondence
A.-L. Reysenbach
reysenbacha{at}pdx.edu
Five hydrogen-oxidizing, thermophilic, strictly chemolithoautotrophic, microaerophilic strains, with similar (99–100 %) 16S rRNA gene sequences were isolated from terrestrial hot springs at Furnas, São Miguel Island, Azores, Portugal. The strain, designated Az-Fu1T, was characterized. The motile, 0·9–2·0 µm rods were Gram-negative and non-sporulating. The temperature growth range was from 50 to 73 °C (optimum at 68 °C). The strains grew fastest in 0·1 % (w/v) NaCl and at pH 6, although growth was observed from pH 5·5 to 7·0. Az-Fu1T can use elemental sulfur, sulfite, thiosulfate, ferrous iron or hydrogen as electron donors, and oxygen (0·2–9·0 %, v/v) as electron acceptor. Az-Fu1T is also able to grow anaerobically, with elemental sulfur, arsenate and ferric iron as electron acceptors. The Az-Fu1T G+C content was 33·6 mol%. Maximum-likelihood analysis of the 16S rRNA phylogeny placed the isolate in a distinct lineage within the Aquificales, closely related to Sulfurihydrogenibium subterraneum (2·0 % distant). The 16S rRNA gene of Az-Fu1T is 7·7 % different from that of Persephonella marina and 6·8 % different from Hydrogenothermus marinus. Based on the phenotypic and phylogenetic characteristics presented here, it is proposed that Az-Fu1T belongs to the recently described genus Sulfurihydrogenibium. It is further proposed that Az-Fu1T represents a new species, Sulfurihydrogenibium azorense.
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