- Volume 46, Issue 4, 1996
Volume 46, Issue 4, 1996
- Original Papers Relating To Systematic Bacteriology
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Phylogenetic Positions of Clostridium chauvoei and Clostridium septicum Based on 16S rRNA Gene Sequences
More LessThe sequences of the 16S rRNA genes (rrs genes) of Clostridium chauvoei, the causative agent of blackleg in cattle, and the phenotypically related organism Clostridium septicum were determined. After amplification of 1,507-bp PCR fragments from the corresponding rrs genes, the sequences were determined in a single round of sequencing by using conserved region primers. A sequence similarity analysis of the sequences revealed the close phylogenetic relationship of C. chauvoei and C. septicum in Clostridium cluster I (M. D. Collins, P. A. Lawson, A. Willems, J. J. Cordoba, J. Fernandez-Garayzabal, P. Garcia, J. Cai, H. Hippe, and J. A. E. Farrow, Int. J. Syst. Bacteriol. 44:812-826. 1994), which includes Clostridium carnis, Clostridium perfringens, Clostridium botulinum, and Clostridium tetani. We found that 99.3% of the nucleotides in the genes of C. chauvoei and C. septicum are identical.
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Genomic Analysis of Different Chlorobium Strains by Pulsed-Field Gel Electrophoresis and Ribotyping
More LessPulsed-field gel electrophoresis was used to characterize the genomes of 15 Chlorobium strains. An analysis of chromosomal macrorestriction patterns allowed us to determine the chromosome sizes, which ranged from 1,435 to 3,342 kb depending on the strain. Moreover, this analysis revealed that, even though the genus Chlorobium is a phylogenetically coherent taxon, there is a great deal of genomic heterogeneity within it. This heterogeneity was corroborated by performing a ribotyping analysis, which showed that the rRNA hybridization patterns of most strains are unique.
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A Proposal for the Transfer of Halorubrobacterium distributum and Halorubrobacterium coriense to the Genus Halorubrum as Halorubrum distributum comb. nov. and Halorubrum coriense comb. nov., Respectively
A. OREN and A. VENTOSAAs the genus Halorubrum was validated before the genus Halorubrobacterium, we propose that the species Halorubrobacterium distributum and Halorubrobacterium coriense should be reclassified as Halorubrum distributum comb. nov. and Halorubrum coriense comb. nov., respectively.
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Phylogenetic Relationships of the Porcine Mycoplasmas Mycoplasma hyosynoviae and Mycoplasma hyopharyngis
More LessThe phylogenetic positions of the porcine mycoplasmas Mycoplasma hyosynoviae and Mycoplasma hyopharyngis were determined by using PCR-amplified 16S rRNA gene sequences. M. hyosynoviae is a member of the Mycoplasma hominis group, while M. hyopharyngis belongs to the Mycoplasma fermentans group of mollicutes. Neither species is closely related to previously characterized porcine mycoplasmas belonging to the Mycoplasma hyorhinis group.
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Ureaplasma gallorale, an Isolate from Chickens, Is Most Closely Related to the Human Isolate, U. urealyticum
More LessUreaplasma gallorale is a urease-containing mycoplasma (a member of the Mollicutes) which is pathogenic for chickens, from which it was originally isolated. We amplified the 16S rRNA gene of this bacterium and then cloned and sequenced the amplicon. A phylogenetic analysis based on an alignment of the 16S rRNA sequences of U. gallorale and several other Ureaplasma species revealed that U. gallorale is more closely related to Ureaplasma urealyticum than to other Ureaplasma species.
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- Matters Relating To The International Committee On Systematic Bacteriology
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- Errata
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