Thermophilic anaerobic bacteria which ferment hemicellulose: characterization of organisms and identification of plasmids |
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Authors: | Paul J Weimer L Winona Wagner Susan Knowlton Thomas K Ng |
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Institution: | (1) Central Research and Development Department, E. I. du Pont de Nemours & Co., Inc., Experimental Station, 19898 Wilmington, DE, USA |
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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 1.5×106 daltons. The taxonomic characteristics of the strains are discussed in terms of their relatedness to those of Thermoanaerobium, Thermoanaerobacter, and Thermobacteroides species.Contribution No. 3222 of the Central Research and Development Department |
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Keywords: | Thermophilic Anaerobic Hemicellulose Xylan Geothermal Plasmids Thermobacteroides Thermoanaerobacter Thermoanaerobium |
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