Abstract
A new group of extremely thermophilic, obligately anaerobic, carboxydotrophic eubacteria is described. The organisms are characterized by a novel type of chemotrophic metabolism in thermophilic environments. They grow at temperatures up to 80-85°C chemolithotrophically with 100% CO in the gas phase as the sole energy source. The CO oxidation is coupled to H2 and CO2 formation according to the equation CO+H2O → H2+CO2. No other products of metabolism are produced. The group of CO-utilizing, H2-producing anaerobes includes diverse bacteria. They are non-sporeforming rods differing in morphology, CO uptake rates, habitats, and maximum growth temperatures. The new carboxydotrophic thermophilic anaerobes are widely distributed in freshwater and coastal marine hydrotherms of the Kuril Islands.
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