A New Facultative Anaerobic Xylan-using Alkalophile Lacking Cytochrome, Quinone, and Catalase

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A facultative anaerobic xylan-using alkalophile has been isolated from an alkalophilic compost fermented for the screening. The strain was gram-positive in the very early stages of growth, and is a sporeforming rod. The strain having anteiso-, iso-branched, and straight-chain cellular fatty acids, lacked cytochrome, quinone, and catalase. It was a facultative anaerobe, whose μmax of aerobic and anaerobic culture were 0.70 h-1 and 0.82 h-1, respectively. Xylanase activity was higher in anaerobic culture than aerobic culture. In static culture, after sharp consumption of oxygen in the medium, xylanase production started. The main fernjentation products from xylan in anaerobic or static culture were formic acid, ethanol, acetic acid, and pyruvic acid, and were acetic and pyruvic acids in aerobic culture. The strain has new characteristics of production of metabolites and xylanase, and has new intermediate characteristics between the genera Bacillus and Clostridium.
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