Caminibacter hydrogeniphilus gen. nov., sp. nov., a novel thermophilic, hydrogen-oxidizing bacterium isolated from an East Pacific Rise hydrothermal vent.

Arcobacter halophilus sp. nov., the first obligate halophile in the genus Arcobacter

“…The currently recognized epsilon subdivision of the Proteobacteria represents a taxonomically diverse but phylogenetically distinct group of Gram-negative bacteria that includes the genera Arcobacter, Campylobacter, Helicobacter, Wolinella, Sulfurospirillum, Nautilia, Caminibacter, Sulfurimonas, Sulfurovum and Thiovulum, among others (Vandamme et al, 1991;Schumacher et al, 1992;Alain et al, 2002;Miroshnichenko et al, 2002;Inagaki et al, 2003Inagaki et al, , 2004Takai et al, 2004). The ecological niches occupied by these bacteria vary considerably, with some species living in association with various animals (including humans) and other species that are free-living and found in environments such as sea water and anaerobic sludge.…”

Clostridium caminithermale sp. nov., a slightly halophilic and moderately thermophilic bacterium isolated from an Atlantic deep-sea hydrothermal chimney

“…Thermophilic microaerophiles are recognized as hydrogenotrophic bacteria belonging to the order Aquificales (Reysenbach et al, 2000a;Götz et al, 2002), but hydrogenotrophic anaerobic thermophiles have also been recovered from deep-sea hydrothermal environments (Jeanthon, 2000;Jeanthon et al, 1998;L'Haridon et al, 1998;Alain et al, 2002a). The latter include methanogens, sulfate-reducing bacteria, members of the e-subclass of the Proteobacteria, and heterotrophic sulfurreducers belonging to the domain Archaea.…”

“…Among these freeliving micro-organisms are bacteria belonging to the e-subclass of the Proteobacteria, and the significance of their ecological role has been identified, mainly in molecular surveys (Haddad et al, 1995;Jeanthon, 2000;Reysenbach et al, 2000b;Corre et al, 2001). The recent isolation, from deep-sea hydrothermal vents, of moderately thermophilic and thermophilic members of the e-subclass of the Proteobacteria has demonstrated the ability of these microorganisms to grow autotrophically using elemental sulfur as a terminal electron acceptor (Campbell et al, 2001;Alain et al, 2002a). This trait of sulfur reduction has also been found to be a common physiological feature of the wellstudied, anaerobic, chemoautotrophic, thermophilic and hyperthermophilic micro-organisms (domain Archaea) isolated from these peculiar deep marine environments (Jeanthon, 2000).…”

“…Both molecular and microbiological studies within deep-sea hydrothermal vent ecosystems have demonstrated the ecological significance of anaerobic and microaerophilic thermophilic to hyperthermophilic micro-organisms (domains Bacteria and Archaea), most of which are involved, in particular, in the reduction (anaerobes) or oxidation (microaerophiles) of elemental sulfur (Jeanthon, 2000;Alain et al, 2002a;Götz et al, 2002). Thermophilic microaerophiles are recognized as hydrogenotrophic bacteria belonging to the order Aquificales (Reysenbach et al, 2000a;Götz et al, 2002), but hydrogenotrophic anaerobic thermophiles have also been recovered from deep-sea hydrothermal environments (Jeanthon, 2000;Jeanthon et al, 1998;L'Haridon et al, 1998;Alain et al, 2002a).…”

Phaeobacter leonis sp. nov., an alphaproteobacterium from Mediterranean Sea sediments

“…No growth was observed at 8 % (w/v) NaCl or without NaCl. The pH range for growth was tested from initial pH 3.0 to initial pH 11.0, at ambient temperature, in basal MB medium buffered and adjusted to the required pH (initial pH at 20 u C), as described elsewhere (Alain et al, 2002). Growth was observed from pH 6.5 to pH 9.0, the optimum being around pH 8.0-9.0.…”