| palaeococcus ferrophilus gen. nov., sp. nov., a barophilic, hyperthermophilic archaeon from a deep-sea hydrothermal vent chimney. | a novel barophilic, hyperthermophilic archaeon was isolated from a deep-sea hydrothermal vent chimney at the myojin knoll in the ogasawara-bonin arc, japan. the cells were found to be irregular cocci and motile with multiple polar flagella. growth was observed between 60 and 88 degrees c (opt. 83 degrees c; 30 min doubling time), ph 4.0 and 8.0 (opt. ph 6.0), 20 and 73 g sea salts l-1 (opt. 47 g l-1) and 0.1 and 60 mpa (opt. 30 mpa). the isolate was a strictly anaerobic chemoorganotroph capable ... | 2000 | 10758851 |
| polyamines of the hyperthermophilic archaebacteria belonging to the genera thermococcus and methanothermus and two new genera caldivirga and palaeococcus. | cellular polyamines of eight new thermophilic archaebacteria were investigated to determine the chemotaxonomic significance of polyamine distribution profiles. hyperthermoacidophilic caldivirga maquilingensis belonging to the family thermoproteaceae of the crenarchaeota have a unique polyamine profile comprising spermidine, norspermidine and norspermine as the major polyamines. within the order thermococcales of the euryarchaeota, the major polyamines of an extremely thermophilic terrestrial spe ... | 2001 | 11297011 |
| palaeococcus helgesonii sp. nov., a facultatively anaerobic, hyperthermophilic archaeon from a geothermal well on vulcano island, italy. | a novel, hyperthermophilic archaeon was isolated from a shallow geothermal well that taps marine waters on the island of vulcano in the southern tyrrhenian sea, italy. the cells were irregular cocci, 0.6-1.5 microm in diameter, with multiple polar flagella. growth was observed at temperatures from 45 to 85 degrees c (optimum at approximately 80 degrees c), ph 5-8 (optimum at 6.5), and 0.5-6.0% nacl (optimum at approximately 2.8%). the minimum doubling time was 50 min. the isolate was obligately ... | 2003 | 12682713 |
| ultrastructural studies of the ovary of palaeococcus fuscipennis (burmeister) (insecta, hemiptera, coccinea: monophlebidae). | ovaries of palaeocoocus fuscipennis are composed of about 100 telotrophic ovarioles that are devoid of terminal filaments. in the ovariole a tropharium ( = trophic chamber) and vitellarium can be distinguished. the tropharium contains 7 trophocytes. a single oocyte develops in the vitellarium. the oocyte is surrounded by follicular cells that do not undergo diversification into subpopulations. the obtained results are discussed in a phylogenetic context. | 2005 | 16212107 |
| compatible solutes of the hyperthermophile palaeococcus ferrophilus: osmoadaptation and thermoadaptation in the order thermococcales. | the effect of salinity and growth temperature on the accumulation of intracellular organic solutes was examined in the hyperthermophilic archaeon palaeococcus ferrophilus. the genus palaeococcus represents a deep-branching lineage of the order thermococcales, which diverged before thermococcus and pyrococcus. palaeococcus ferrophilus accumulated mannosylglycerate, glutamate, and aspartate as major compatible solutes. unlike members of the genera pyrococcus and thermococcus, palaeococcus ferrophi ... | 2005 | 16332790 |
| identification of a glycolytic regulon in the archaea pyrococcus and thermococcus. | the glycolytic pathway of the hyperthermophilic archaea that belong to the order thermococcales (pyrococcus, thermococcus and palaeococcus) differs significantly from the canonical embden-meyerhof pathway in bacteria and eukarya. this archaeal glycolysis variant consists of several novel enzymes, some of which catalyze unique conversions. moreover, the enzymes appear not to be regulated allosterically, but rather at transcriptional level. to elucidate details of the gene expression control, the ... | 2006 | 16790020 |
| ultrastructure and transovarial transmission of endosymbiotic microorganisms in palaeococcus fuscipennis (burmeister) (insecta, hemiptera, coccinea: monophlebidae). | ovaries ofpalaeococcus fuscipennis (burmeister) are accompanied by large organs termed bacteriomes which are composed of large cells termed bacteriocytes. each bacteriocyte is surrounded with small epithelial cells. the bacteriocyte cytoplasm is tightly packed with pleomorphic bacteria, whereas in epithelial cells small coccoid microorganisms are present. the number of coccoid bacteria is significantly lower than pleomorphic bacteria. the ovarioles containing choriogenic oocytes are invaded both ... | 2006 | 17044263 |