%0 Journal Article %A Vésteinsdóttir, Hildur %A Reynisdóttir, Dagný B. %A Örlygsson, Jóhann %T Hydrogenophilus islandicus sp. nov., a thermophilic hydrogen-oxidizing bacterium isolated from an Icelandic hot spring %D 2011 %J International Journal of Systematic and Evolutionary Microbiology, %V 61 %N 2 %P 290-294 %@ 1466-5034 %R https://doi.org/10.1099/ijs.0.023572-0 %K SEM, scanning electron microscopy %K SOX, sulfur-oxidizing %K HOX, hydrogen-oxidizing %I Microbiology Society, %X A novel chemolithotrophic bacterium, strain 16CT, was isolated from a hot spring in Graendalur, south-west Iceland. Cells of this organism were Gram-negative, rod-shaped and motile. The isolate was aerobic and capable of chemolithotrophic growth on hydrogen and carbon dioxide, heterotrophic growth on butyrate and several other organic compounds, and mixotrophic growth on butyrate, hydrogen and carbon dioxide. Heterotrophic growth was generally enhanced in the presence of yeast extract. Autotrophic growth on hydrogen was observed at pH values between 6.0 and 10.0 and temperatures between 35 and 60 °C; optimum growth conditions were pH 7.0 and 55 °C. The DNA G+C content was 63.9 mol%. 16S rRNA gene sequence analysis showed that strain 16CT was a member of a distinct species belonging to the class Betaproteobacteria and was most closely related to Hydrogenophilus thermoluteolus NBRC 14978T and Hydrogenophilus hirschii DSM 11420T. The major cellular fatty acids were straight-chain C16 : 0 (44.98 %) and C18 : 1 ω7c (17.93 %), as well as cyclic C17 : 0 (13.90 %) and C19 : 0 ω8c (4.67 %) fatty acids. Based on its physiological and molecular properties, it is concluded that strain 16CT represents a novel species within the genus Hydrogenophilus, for which the name Hydrogenophilus islandicus is proposed; the type strain is 16CT (=DSM 21442T=JCM 16106T). %U https://www.microbiologyresearch.org/content/journal/ijsem/10.1099/ijs.0.023572-0