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A Gram-stain-positive, strictly anaerobic, mesophilic, amylolytic, rod-shaped bacterium, designated strain SW408T, was isolated from a laboratory-scale H2-producing upflow anaerobic sludge blanket reactor. The strain grew at 24–45 °C (no growth at or below 22 °C or at or above 47 °C), with optimum growth at 37 °C. The pH range for growth was 4.0–9.0 (no growth at or below pH 3.6 or at or above pH 9.3), with optimum growth at pH 7.0. Starch, cellobiose, glucose, fructose, galactose, lactose, maltose, mannose, ribose and sucrose supported growth. The major end products from glucose fermentation were ethanol, acetate, hydrogen and carbon dioxide. Abundant H2 was produced from starch fermentation. The DNA G+C content was 33.1 mol% (T m method). Phylogenetic analysis based on 16S rRNA gene sequence analysis showed that the bacterium represents a previously unrecognized species within Clostridium rRNA cluster I and is most closely related to the type strain of Clostridium frigidicarnis (94.9 % similarity). On the basis of phenotypic, genotypic and phylogenetic characteristics, strain SW408T was identified as a representative of a novel species of the genus Clostridium, for which the name Clostridium amylolyticum sp. nov. is proposed. The type strain is SW408T (=JCM 14823T=AS 1.5069T=CGMCC 1.5069T).
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International Journal of Systematic and Evolutionary Microbiology vol. 58 , part 9, pp. 2132 - 2135
Supplementary Fig. S1. Electron micrograph of negatively stained cell of strain SW408 Tshowing peritrichous flagella.
Supplementary Table S1. Differences in cellular fatty acid composition of strain SW408 Tand phylogenetically related clostridia.
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