| nautilia profundicola sp. nov., a thermophilic, sulfur-reducing epsilonproteobacterium from deep-sea hydrothermal vents. | a thermophilic, strictly anaerobic, sulfur-reducing epsilonproteobacterium (strain amh(t)) isolated from deep-sea hydrothermal vents is described. cells were motile, gram-negative rods. growth was observed at 30-55 degrees c, ph 6.0-9.0 and 2-5 % (w/v) nacl. chemolithoautotrophic growth occurred with molecular hydrogen or formate as the electron donor and elemental sulfur as the electron acceptor, producing hydrogen sulfide. heterotrophic and mixotrophic growth occurred with formate as a source ... | 2008 | 18599701 |
| adaptations to submarine hydrothermal environments exemplified by the genome of nautilia profundicola. | submarine hydrothermal vents are model systems for the archaean earth environment, and some sites maintain conditions that may have favored the formation and evolution of cellular life. vents are typified by rapid fluctuations in temperature and redox potential that impose a strong selective pressure on resident microbial communities. nautilia profundicola strain am-h is a moderately thermophilic, deeply-branching epsilonproteobacterium found free-living at hydrothermal vents and is a member of ... | 2009 | 19197347 |
| nautilia abyssi sp. nov., a thermophilic, chemolithoautotrophic, sulfur-reducing bacterium isolated from an east pacific rise hydrothermal vent. | a novel strictly anaerobic, thermophilic, sulfur-reducing bacterium, designated ph1209(t), was isolated from an east pacific rise hydrothermal vent (1 degrees n) sample and studied using a polyphasic taxonomic approach. cells were gram-negative, motile rods (approx. 1.60 x 0.40 microm) with a single polar flagellum. strain ph1209(t) grew at temperatures between 33 and 65 degrees c (optimum 60 degrees c), from ph 5.0 to 8.0 (optimum 6.0-6.5), and between 2 and 4 % (w/v) nacl (optimum 3 %). cells ... | 2009 | 19502307 |
| nitrate ammonification by nautilia profundicola amh: experimental evidence consistent with a free hydroxylamine intermediate. | the process of nitrate reduction via nitrite controls the fate and bioavailability of mineral nitrogen within ecosystems; i.e., whether it is retained as ammonium (ammonification) or lost as nitrous oxide or dinitrogen (denitrification). here, we present experimental evidence for a novel pathway of microbial nitrate reduction, the reverse hydroxylamine:ubiquinone reductase module (reverse-hurm) pathway. instead of a classical ammonia-forming nitrite reductase that performs a 6 electron-transfer ... | 2013 | 23847604 |
| epsilonproteobacterial hydroxylamine oxidoreductase (εhao): characterization of a 'missing link' in the multihaem cytochrome c family. | members of the multihaem cytochrome c (mcc) family such as pentahaem cytochrome c nitrite reductase (nrfa) or octahaem hydroxylamine oxidoreductase (hao) are involved in various microbial respiratory electron transport chains. some members of the hao subfamily, here called εhao proteins, have been predicted from the genomes of nitrate/nitrite-ammonifying bacteria that usually lack nrfa. here, εhao proteins from the host-associated epsilonproteobacteria campylobacter fetus and campylobacter curvu ... | 2017 | 28388834 |
| nautilia nitratireducens sp. nov., a thermophilic, anaerobic, chemosynthetic, nitrate-ammonifying bacterium isolated from a deep-sea hydrothermal vent. | a thermophilic, anaerobic, chemosynthetic bacterium, designated strain mb-1(t), was isolated from the walls of an active deep-sea hydrothermal vent chimney on the east pacific rise at degrees 50' n 10 degrees 17' w. the cells were gram-negative-staining rods, approximately 1-1.5 mum long and 0.3-0.5 mum wide. strain mb-1(t) grew at 25-65 degrees c (optimum 55 degrees c), with 10-35 g nacl l(-1) (optimum 20 g l(-1)) and at ph 4.5-8.5 (optimum ph 7.0). generation time under optimal conditions was ... | 2010 | 19667392 |