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Palaeococcus helgesonii is a hyperthermophillic, anaerobic yet microaerobic archaeon from a geothermal well found in Vulcano, Italy. It is characterized as sphere-shaped, has a cell diameter ranging from 0.6 to 1.5 μm, a cell envelope consisting of a cytoplasmic membrane, a periplasmic space, a thin, electron-dense layer, and tufts of polar flagella. It occurs singly or in pairs. It can survive in temperatures ranging from 45 to 80°C, a pH range of 5 to 8, and a salt range of 0.5 to 6.0%. In optimal conditions (a temperature of 80°C, a pH around 6.5, and a salt level of 2.8), it has a doubling time of 50 minutes. It also has a G+C of 42.5 mol.%.

References

1. ^ Amend, Jan P.; Meyer-Dombard, D'Arcy R.; Sheth, Seema N.; Zolotova, Natalya; Amend, Andrea C. (June 2003). "Palaeococcus helgesonii sp. nov., a facultively anaerobic, hyperthrmophillic archaeon from a geothermal well on Vulcano Island, Italy". Archives of Microbiology. 179 (6): 394–401. doi:10.1007/s00203-003-0542-7.

Further reading

• Karyn L. Rogers & J.P. Amend (October 2005). "Archaeal diversity and geochemical energy yields in a geothermal well on Vulcano Island, Italy". Geobiology. 3 (4): 319–322. doi:10.1007/s00203-003-0542-7.

External links

• Type strain of Palaeococcus helgesonii at BacDive - the Bacterial Diversity Metadatabase

• Euryarchaeota
• Archaea described in 2006