Thermothrix thioparus gen. et sp. nov. a facultatively anaerobic facultative chemolithotroph living at neutral pH and high temperature.

摘要: Thermothrix thioparus gen. et sp. nov. occurs naturally in a New Mexico hot spring at temperature of 74 °C, pH 7.0, and HS− concentration 1 mg/litre. The organism is gram-negative, non-motile, 0.5–1.0 × 3–20 μm, forms cell chains up to 1 cm length. resulting filaments do not possess sheath. Sulfur deposited extracellularly. was isolated using an autotrophic medium with as the energy source NO3− terminal electron acceptor. Anaerobically either NO2− or required, formed from NO3−, no observable gas evolved. Oxygen can also be used acceptor, but growth poor because decreased solubility O2 temperatures required for growth. Alternate sources aerobically anaerobically include hexose, SO3−, S2O3=. optimum 70–73 °C 62 77 °C. organism's thermal physiological characteristics are compared those Bacillus stearothermoph...