No abstract

The phylogenetic position of Acidaminococcus fermentans was determined by comparative sequence analysis of the 16S rRNA. This Gram-negative bacterium is a member of the Sporomusa cluster that is defined by other Gram-negative bacteria, i.e. Sporomusa, Megasphaera, Selenomonas, Butyrivibrio, Pectinatus, and Zymophilus. The branching point of this group within the radiation of Gram-positive bacteria of the Clostridium/Bacillus subphylum and adjacent to Peptococcus niger could be confirmed. Chemotaxonomic data were provided for a more detailed characterization of A. fermentans.

The phylogenetic position of Acidaminococcus fermentans was determined by comparative sequence analysis of the 16S rRNA. This Gram‐negative bacterium is a member of the Sporomusa cluster that is defined by other Gram‐negative bacteria, i.e. Sporomusa, Megasphaera, Selenomonas, Butyrivibrio, Pectinatas, and Zymophilus. The branching point of this group within the radiation of Gram‐positive bacteria of the Clostridium/Bacillus subphylum and adjacent to Peptococcus niger could be confirmed. Chemotaxonomic data were provided for a more detailed characterization of A. fermentans.

Summary The complete nucleotide sequence of 16S rRNA from Propionigenium modestum was determined and compared with 380 16S rRNA sequences from representatives of all eu‐ and archaebacterial phyla known so far. The phylogenetic analysis of this data set indicated P. modestum to represent a new separated line of descent within the radiation of eubacterial phyla moderately related to cyano‐bacteria and Gram‐positive bacteria with low DNA GC content.

The complete nucleotide sequence of 16S rRNA from Propionigenium modestum was determined and compared with 380 16S rRNA sequences from representatives of all eu- and archaebacterial phyla known so far. The phylogenetic analysis of this data set indicated P. modestum to represent a new separated line of descent within the radiation of eubacterial phyla moderately related to cyanobacteria and Gram-positive bacteria with low DNA GC content.