Abstract

A strain of a strictly anaerobic, thermophilic eubacterium (AKO-1) was isolated from a consortium converting acetic acid to methane at 60 °C. Growth of the organism occurred at 40 °C to 75 °C with an optimum at 64–66 °C. Various sugars supported growth. Main fermentation products of glucose were ethanol and CO 2 ; up to 1.25 mol ethanol were formed per mol xylose. The comparative morphological, physiological and DNA:DNA hybridization studies revealed that the organism was closely related to the non-sporeformer Thermoanaerobacter ethanolicus . However the ability to form heat resistant spores and the lack of an inner and outer cell wall layer separated the new isolate from T. ethanolicus. The name Thermoanaerobacter finnii spec. nov. is proposed for this bacterium.

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