Palaeococcus helgesonii

Palaeococcus helgesonii
Scientific classification
Domain:	Archaea
Kingdom:	Euryarchaeota
Phylum:	Euryarchaeota
Class:	Thermococci
Order:	Thermococcales
Family:	Thermococcaceae
Genus:	Palaeococcus
Species:	P. helgesonii
Binomial name
	Palaeococcus helgesonii; Amend et al. 2006

Palaeococcus helgesonii is a hyperthermophillic, anaerobic yet microaerobic archaeon from a geothermal well found in Vulcano, Italy.^[1] 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.^[1] 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%.^[1] 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.^[1] It also has a G+C of 42.5 mol.%.^[1]

^ ^a ^b ^c ^d ^e 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.

[amend-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.

[1]