Thermoanaerobacter mathranii sp. nov., an ethanol-producing, extremely thermophilic anaerobic bacterium from a hot spring in Iceland |
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Authors: | Lise Larsen Peter Nielsen B K Ahring |
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Institution: | (1) Department of Environmental Science and Engineering, Technical University of Denmark, Bldg. 115, DK-2800 Lyngby, Denmark Tel. +45-4525-1655; Fax +45-4593-2850 e-mail: bka@imt.dtu.dk, DK |
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Abstract: | The extremely thermophilic ethanol-producing strain A3 was isolated from a hot spring in Iceland. The cells were rod-shaped,
motile, and had terminal spores; cells from the mid-to-late exponential growth phase stained gram-variable but had a gram-positive
cell wall structure when viewed by transmission electron microscopy. Strain A3 used a number of carbohydrates as carbon sources,
including xylan, but did not utilize microcrystalline cellulose. Fermentation end products were ethanol, acetate, lactate,
CO2, and H2. The temperature optimum for growth was between 70 and 75° C, and growth occurred in the range of 50–75° C. The pH range
for growth was 4.7–8.8, with an optimum at pH 7.0. Strain A3 was sensitive to tetracycline, chloramphenicol, penicillin G,
neomycin, and vancomycin at 100 mg/l but was not sensitive to chloramphenicol and neomycin at 10 mg/l, which indicates that
strain A3 belongs to the eubacteria. Addition of 50.66 kPa H2 or 2% NaCl did not affect growth. The isolate grew in the presence of exogenously added 4% (w/v) ethanol. The G+C ratio was
37 mol%. 16S rDNA studies revealed that strain A3 belongs to the genus Thermoanaerobacter. Genotypic and phenotypic differences between strain A3 and other related species indicate that strain A3 can be assigned
to a new species, and the name Thermoanaerobacter mathranii is proposed.
Received: 7 October 1996 / Accepted: 14 March 1997 |
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Keywords: | Anaerobe Thermophile Xylose Hemicellulose Ethanol Hot spring Iceland Thermoanaerobacter mathranii |
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