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  • Title: Taxonomy of the glycerol fermenting clostridia and description of Clostridium diolis sp. nov.
    Author: Biebl H, Spröer C.
    Journal: Syst Appl Microbiol; 2002 Dec; 25(4):491-7. PubMed ID: 12583708.
    Abstract:
    Six Clostridium strains which ferment glycerol to 1,3-propanediol were tested for their taxonomic and phylogenetic relatedness. All but one were known as C butyricum. By physiological tests, 16S rDNA sequences and fatty acid composition two groups were distinguished. The first comprised the strains VPI 3266, DSM 2478 and DSM 523 (C. "kainantoi") and was consistent with the type strain of C. butyricum in almost all characters. The second group comprising the strains DSM 5430, DSM 5431 and E5 was related to C. beijerinckii. The 16S rDNAs of these strains were almost identical with that of the type strain of C. beijerinckii, DSM 791. The DNA-DNA hybridization value of DSM 5431 and ES with C. beijerinckii DSM 791 was markedly but not decisively lower (67 and 72%, respectively). However, there were significant physiological differences to C. beijerinckii which suggested to describe the strains as a separate species, Clostridium diolis with strain SH1 (= DSM 5431) as the type strain. The new species is distinguished from C. beijerinckii, which requires complex nutrients, by its ability to grow in glucose mineral medium with biotin as the only growth factor and by differences in substrate utilization. "C. kainantoi" Takeda and Matsui was recognized as a later synonym of C. butyricum.
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