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Institut National de la Recherche Agronomique, Laboratoire de Biotechnologie de I'Environnement (LBE), Avenue des Etangs, 11100 Narbonne, France
Author for correspondence: Dominique Patureau. Tel: +33 468 42 51 69. Fax: +33 468 42 51 60. e-mail: patureau{at}ensam.inra.fr
ABSTRACT
A denitrifier micro-organism was isolated from an upflow denitrifying filter inoculated with an activated sludge. The cells were Gram-negative, catalase-and oxidase-positive curved rods and very motile. They were aerobic as well as anoxic heterotrophs that had an atypical respiratory type of metabolism in which oxygen and nitrogen oxides were used simultaneously as terminal electron acceptors. The G+C content was 65 mol%. Our isolate was phenotypically similar to Comamonas testosteroni, according to classical systematic classification systems. However, a phylogenetic analysis based on the 16S rRNA sequence showed that the aerobic denitrif could not be assigned to any currently recognized genus. For these reasons a new genus and species, Microvirgula aerodenitrificans gen. nov., sp. nov., is proposed, for which SGLY2Tis the type strain.
Key Words: Microvirgula aerodenitrificans gen. nov. • sp. nov. • co-respiration of oxygen and nitrogen oxides • Proteobacteria • fluorescent in situ hybridization • oligonucleotide probes
The GenBank accession number for the nearly complete sequence (nt 9–1509) of the 16S rRNA gene reported in this paper is U89333.
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