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Thermococcus alcaliphilus sp. nov., a new hyperthermophilic archaeum growing on polysulfide at alkaline pH

Keller, M. ; Braun, F. J. ; Dirmeier, R. ; Hafenbradl, D. ; Burggraf, S. ; Rachel, Reinhard ; Stetter, Karl Otto



Abstract

A novel coccoid-shaped, hyperthermophilic, heterotrophic member of the archaea was isolated from a shallow marine hydrothermal system at Vulcano Island, Italy. The isolate grew between 56 and 90 degrees C with an optimum around 85 degrees C. The pH range for growth was 6.5 to 10.5, with an optimum around 9.0. Polysulfide and elemental sulfur were reduced to H2S. Sulfur stimulated the growth rate. ...

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