Thermophilic anaerobic bacteria which ferment hemicellulose: characterization of organisms and identification of plasmids

  • Weimer P
  • Wagner L
  • Knowlton S
 et al. 
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Abstract

Seven thermophilic anaerobic bacteria which ferment xylan were isolated from natural geothermal features in the western United States. Typically, these strains were Gram-negative non-sporeforming rods with an unusual double-layered cell wall which resembled that observed in Thermobacteroides acetoethylicus. The strains differed from known thermophilic anaerobes in their ability to utilize a very wide variety of carbohydrates and in their ability to grow in a chemically-defined medium and/or at pH 3.5. Four of the strains contained cryptic plasmids of 1.2 or 1.5 X 10(6) daltons. The taxonomic characteristics of the strains are discussed in terms of their relatedness to those of Thermoanaerobium, Thermoanaerobacter, and Thermobacteroides species.

Author-supplied keywords

  • Anaerobic
  • Geothermal
  • Hemicellulose
  • Plasmids
  • Thermoanaerobacter
  • Thermoanaerobium
  • Thermobacteroides
  • Thermophilic
  • Xylan

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