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Hydrogenophaga caeni sp. nov., isolated from activated sludge

Division of Applied Life Science, EB-NCRC, PMBBRC, Gyeongsang National University, Jinju 660-701, Republic of Korea

Correspondence
Che Ok Jeon
cojeon{at}gnu.ac.kr

A Gram-negative bacterium, designated strain EMB71^T, was isolated from activated sludge used for enhanced biological phosphorus removal in a sequencing batch reactor. The cells of the isolate were facultatively aerobic, motile rods with single polar flagella. Growth was observed to occur at 15–35 °C (optimally at 30 °C) and at pH 6.0–9.0 (optimally at pH 7.0–8.0). The predominant fatty acids of strain EMB71^T were C_{16 : 0} and summed feature 3 (C_{16 : 1}7c and/or iso-C_{15 : 0} 2-OH), and the polar lipids comprised a large amount of phosphatidylethanolamine and a small amount of diphosphatidylglycerol. The G+C content of the genomic DNA was 61.6 mol % and the major quinone was Q-8. Comparative 16S rRNA gene sequence analyses showed that strain EMB71^T formed a phyletic lineage with the genus Hydrogenophaga within the family Comamonadaceae. The levels of 16S rRNA gene sequence similarity with respect to the type strains of Hydrogenophaga species ranged from 95.1 to 96.9 %. On the basis of the phenotypic, chemotaxonomic and molecular data, strain EMB71^T represents a novel species of the genus Hydrogenophaga, for which the name Hydrogenophaga caeni sp. nov. is proposed. The type strain is EMB71^T (=KCTC 12613^T=DSM 17962^T).

Figures showing the morphology of negatively stained cells of strain EMB71^T and phylogenetic trees generated using maximum-likelihood and maximum-parsimony and a table detailing the cellular fatty acid compositions of strain EMB71^T and related species are available as supplementary material in IJSEM Online.

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