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1GSF - Forschungszentrum für Umwelt und Gesundheit, Institut für Hydrologie, Ingolstädter LandstraøZe 1, D-85764 Neuherberg, Germany
2Zentrum für Ultrastrukturforschung und Ludwig-Boltzmann-Institut für Molekulare Nanotechnologie, Universität für Bodenkultur, A-1180 Vienna, Austria
3Institut für Ingenieurbiologie und Biotechnologie des Abwassers, D-76128 Karlsruhe, Germany
4DSMZ - Deutsche Sammlung von Mikroorganismen und Zellkulturen GmbH, Mascheroder Weg 1 b, D-38124 Braunschweig, Germany
5Tel: +49 89 3187 2579. Fax: +49 89 3187 3361. e-mail: gerhard.zellner{at}gsf.de
ABSTRACT
Strain INSLUZT(= DSM 4273T) was isolated from a biogas-producing bioreactor treating wastewater of a palm oil mill on North-Sumatra (Indonesia). Cells of strain INSLUZTwere highly irregularly coccoid, 1·25-2·0 in diameter, had a cell envelope consisting of the cytoplasmic membrane and an S-layer of hexagonally arranged glycoprotein subunits with an Mr of 120 000, and were flagellated (motility was not observed). Cells were mesophilic and grew most rapidly at 40 °C on H2/CO2, formate, 2-propanol/CO2'2-butanol/CO2and cyclopentanol/CO2to give methane. Tungstate promoted growth on H2/CO2 with acetate as the solely required organic medium supplement. The G+C content of DNA was 59 mol% (Tm method) and 59·5 mol% (HPLC method). 16S rDNA analysis revealed a phylogenetic relationship to Methanoculleus species; the name Methanoculleus palmolei sp. nov. is therefore proposed for strain INSLUZT(= DSM 4273T).
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