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Träfflista för sökning "WFRF:(Roos Anna Maria) srt2:(2010-2014)"

Sökning: WFRF:(Roos Anna Maria) > (2010-2014)

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  • Westerholm, Maria, et al. (författare)
  • Syntrophaceticus schinkii gen. nov., sp nov., an anaerobic, syntrophic acetate-oxidizing bacterium isolated from a mesophilic anaerobic filter
  • 2010
  • Ingår i: FEMS Microbiology Letters. - : Oxford University Press (OUP). - 0378-1097 .- 1574-6968. ; 309, s. 100-104
  • Tidskriftsartikel (refereegranskat)abstract
    • A mesophilic, syntrophic acetate-oxidizing bacterium, designated strain Sp3T, was isolated from sludge from a mesophilic methanogenic digestor operating at a high ammonium concentration (6.4 g L-1 NH(4)+-N). The strain showed acetate-oxidizing ability in cocultivation with a hydrogen-consuming methanogen. Comparative 16S rRNA gene sequence analysis confirmed that strain Sp3T belonged to the Firmicutes-Clostridia class. The most closely related species was Thermacetogenium phaeum (16S rRNA gene sequence identity 92%). Strain Sp3T used ethanol, betaine and lactate as carbon and electron sources and showed growth between 25 and 40 degrees C and pH 6.0 and 8.0. Based on the phylogenetic position and the physiological characteristics of strain Sp3T, this new syntrophic, acetate-oxidizing bacterium is proposed as the new genus and species Syntrophaceticus schinkii, with Sp3T (=JCM 16669T) as the type strain. An isolate (strain Esp=JCM 16670) with high 16S rRNA gene sequence identity (99%) to syntrophic acetate-oxidizing Clostridium ultunense was also retrieved from the methanogenic digestor.
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3.
  • Westerholm, Maria, et al. (författare)
  • Tepidanaerobacter acetatoxydans sp. nov., and anaerobic, syntrophic acetate-oxidizing bacterium isolated from two ammonium-enriched mesophilic methanogenic processes
  • 2011
  • Ingår i: Systematic and Applied Microbiology. - : Elsevier BV. - 0723-2020 .- 1618-0984. ; 34, s. 260-266
  • Tidskriftsartikel (refereegranskat)abstract
    • Four anaerobic syntrophic acetate-oxidizing bacteria, the thermotolerant strains Re1T, Re2, T1 and T2, were isolated from two different mesophilic methanogenic systems. The strains originate from sludge of a continuously stirred laboratory-scale reactor containing high levels of ammonium and from a high ammonium enrichment culture. Comparative 16S rRNA gene sequence analysis confirmed that the strains belong to the Firmicutes-Clostridia class. The most closely related species to strains Re1T, Re2, T1 and T2 was Tepidanaerobacter syntrophicus, with a 16S rRNA gene sequence identity of 96%. The DNA–DNA relatedness of strains Re2, T1 and T2 to strain Re1T was 92, 102, 81%, respectively. The gene encoding the acetogen key enzyme formyltetrahydrofolate synthetase (FTHFS) was detected and partly sequenced from the strains. In pure culture the bacteria used different organic compounds as carbon and energy source, such as organic acids, alcohols, sugars and amino acids. Furthermore, acetate-oxidizing ability was observed during co-cultivation with a hydrogen-consuming Methanoculleus sp. The bacteria were found to be spore-forming, rod-shaped and motile, and possessed Gram-positive cell walls. The four strains were thermotolerant and grew at temperatures between 25 and 55°C. Strain Re1T had a DNA G+C content of 38.4% and the major fatty acids were C18:1 w7c, C18:1 w9c, anteiso-C17:0, C16:1 w7c and C18:0. The genetic and phenotypic properties of strains Re1T, Re2, T1 and T2 suggest classification as representatives of a novel species of the genus Tepidanaerobacter; the name Tepidanaerobacter acetatoxydans sp. nov. is suggested. The type strain of T. acetatoxydans is Re1T (=DSM 21804T=JCM 16047T).
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