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Department of Microbiology, Cornell University, Ithaca, NY 14853-8101, USA
Correspondence
Eugene L. Madsen
elm3{at}cornell.edu
Strain CJ2T, capable of growth on naphthalene as a sole carbon and energy source, was isolated from coal-tar-contaminated freshwater sediment. The Gram reaction of strain CJ2T was negative. The cells were non-spore-forming, non-motile cocci (without flagella). The isolate was found to be an aerobic heterotroph capable of utilizing glucose and other simple sugars. Growth was observed between 4 and 25 °C (optimum, 20 °C) and between pH 6·0 and 9·0 (optimum, pH 7·07·5). The G+C content of the genomic DNA was 61·5 mol% and the major quinone was ubiquinone-8. The peptidoglycan of strain CJ2T was determined as belonging to type A1-
, meso-diaminopimelic acid. The major fatty acids of strain CJ2T were 16 : 1
7c (67·0 %), 16 : 0 (19·6 %), 18 : 1
7c (
7·9 %) and 10 : 0 3-OH (
2·5 %). The polar lipids were phosphatidylethanolamine, phosphatidylglycerol and diphosphatidylglycerol. Mycolic acid and glycolipids could not be detected. Comparative 16S rDNA analysis indicated that strain CJ2T is related to the family Comamonadaceae and that the nearest phylogenetic relative was Polaromonas vacuolata 34-PT (97·1 % similarity). On the basis of the physiological and molecular properties, the naphthalene-degrading isolate was designated Polaromonas naphthalenivorans sp. nov. The type strain is CJ2T (=ATCC BAA-779T=DSM 15660T).
-hydroxyalkanoic acidPublished online ahead of print on 18 July 2003 as DOI 10.1099/ijs.0.02636-0.
The GenBank accession number for the 16S rDNA sequence of strain CJ2T is AY166684.
Micrographs of strain CJ2T, growth curves in various media and details of aromatic hydrocarbon metabolism are available as supplementary material in IJSEM Online.
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