Journal
INTERNATIONAL JOURNAL OF SYSTEMATIC AND EVOLUTIONARY MICROBIOLOGY
Volume 54, Issue -, Pages 2257-2262Publisher
MICROBIOLOGY SOC
DOI: 10.1099/ijs.0.63212-0
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Two mesophilic anaerobic bacterial strains (Z7(T) and Z1) were isolated from waste water sludge of the Xinanzhang paper mill, Beijing, China. The strains were Gram-positive, non-spore-forming and motile. Cells were thin rods (0.2-0.4 x 4.0-8.0 pm). Growth of the strains was observed at 20-42degreesC and pH 5.0-7.5. Both strains hydrolysed gelatin and aesculin and fermented several kinds of mono-, di- and oligosaccharides. The fermentation end products formed from glucose were acetate, ethanol, hydrogen and carbon dioxide. The predominant cellular fatty acids were the branched-chain fatty acids isoC(15:0) (42.83%) and isoC(14:0) (32.11%). The DNA G + C contents of strains Z7(T) and Z1 were 50.4 and 48.6 mol%, respectively. Phylogenetic analysis based on 16S rRNA gene sequences revealed that the isolates represent a new phyletic sublineage within the Clostridium leptum, rRNA cluster, with < 91% 16S rRNA gene sequence similarity to currently described species. On the basis of polyphasic evidence from this study, Acetanaerobacterium elongatum gen. nov., sp. nov., a novel genus and species, is proposed, with strain Z7(T) ( = JCM 12359(T) = AS 1.5012(T)) as the type strain.
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