首页 | 本学科首页   官方微博 | 高级检索  
   检索      


Thermoanaerobium acetigenum spec. nov., a new anaerobic,extremely thermophilic,xylanolytic non-spore-forming bacterium isolated from an Icelandic hot spring
Authors:Peter Nielsen  Indra M Mathrani  Birgitte K Ahring
Institution:(1) Anaerobic Microbiology/Biotechnology Group, Department of Biotechnology, Technical University of Denmark, Building 223, DK-2800 Lungby, Denmark
Abstract:An anaerobic, extremely thermophilic, xylanolytic nonspore-forming bacterium, strain X6B, was isolated from a 70°C Icelandic hot spring sediment. The bacterium was rod-shaped, 3.6–5.9 mgrm long and 0.7 to 1.0 mgrm wide, and cells grew singly, in pairs, and occasionally formed chains. The bacterium was nonmotile with no flagella. Cells from mid-to late exponential gowth-phase cultures stained gram-negative but had a gram-positive like cell wall structure in transmission electron photomicrographs. The bacterium grew between 50°C and 78°C with an optimum temperature at about 65°C to 68°C. Growth occurred between pH 5.2 and 8.5 with an optimum pH close to 7. During growth on beech wood xylan, glucose and d-xylose, the isolate produced CO2, acetate and H2 as major fermentation products, and a small amounts of ethanol; lactate was not produced. X6B did not reduce acetone to isopropanol or sulphate or thiosulfate to sulfide. The base composition of X6B's cellular DNA was 35.7 mol% guanine + cytosine. The properties of this strain do not fit any previously described species. The name proposed for the isolated bacterium was Thermoanaerobium acetigenum, spec. nov.
Keywords:Anaerobe  Thermophilic  Xylan  Hemicellulose  Chemoorganotrophic  Hot spring  Thermoanaerobium acetigenum
本文献已被 SpringerLink 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号