ot roph ic . ▁ ▁H . ▁vol can ii ▁will ▁optim ally ▁grow ▁at ▁ 4 2   ° C ▁in ▁ 1 . 5 - 2 . 5 ▁M ▁Na Cl ▁and ▁complex ▁nut ri ent ▁medium . ▁It ▁will ▁still ▁grow ▁at ▁ 3 7   ° C , ▁but ▁still ▁requires ▁the ▁concentr ated ▁Na Cl ▁and ▁complex ▁medium . ▁ ▁Due ▁to ▁the ▁salt ▁in ▁method ▁cy top las mic ▁prote ins ▁are ▁struct ured ▁to ▁fol d ▁in ▁the ▁presence ▁of ▁high ▁ion ic ▁concentr ations . ▁As ▁such ▁they ▁typically ▁have ▁a ▁large ▁number ▁of ▁charged ▁resid ues ▁on ▁the ▁exterior ▁section ▁of ▁the ▁protein ▁and ▁very ▁hydro ph ob ic ▁resid ues ▁forming ▁a ▁core . ▁This ▁structure ▁increases ▁their ▁stability ▁in ▁sal ine ▁and ▁even ▁high ▁temperature ▁environments ▁consider ably , ▁but ▁comes ▁at ▁some ▁loss ▁of ▁process ivity ▁compared ▁to ▁b acter ial ▁hom olog s . ▁ ▁H . ▁vol can ii ▁resp ire ▁as ▁their ▁sole ▁source ▁of ▁ATP , ▁unlike ▁several ▁other ▁hal ob ater ia ca e , ▁such ▁as ▁Hal ob acter ium ▁sal inar um ▁they ▁are ▁in cap able ▁of ▁phot oph osph ory lation ▁as ▁they ▁lack ▁the ▁necessary ▁b acter ior hod ops in . ▁ ▁E col ogy ▁ ▁Is ol ates ▁of ▁H . ▁vol can ii ▁are ▁commonly ▁found ▁in ▁high - sal inity ▁aqu atic ▁environments , ▁such ▁as ▁the ▁Dead ▁Sea . ▁Their ▁precise ▁role ▁in ▁the ▁e cos