Abstract
Summary A new species of sporulating thermophilic anaerobes, Clostridium thermolacticum sp. nov., is described. Two strains, TC 21 and TX 41, were isolated from methanogenic enrichment cultures on cellulose and xylan, respectively. Both isolates actively ferment xylan, starch, cellobiose and various sugars with L-lactate as the main end-product. In addition, strain TC 21 weakly ferments cellulose to produce a mixture of ethanol and acetate. Optimum conditions for growth are 60–65°C and pH 7.0–7.2. The DNA type strain C. thermolacticum TX 41 contains 40.9 % mol G + C.
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