Marinobacter lutaoensis sp. nov., a thermotolerant marine bacterium isolated from a coastal hot spring in Lutao, Taiwan

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Abstract:

A heterotrophic and thermotolerant marine bacterium, designated strain T5054, was isolated from a hot spring on the coast of Lutao, Taiwan. It was a strictly aerobic, Gram-negative rod. Cells grown in broth cultures were non-spore-forming and motile by means of one to several polar flagella. It seems that pilus-like structures were produced from both poles of the cells. Strain T5054 required Na+ for growth and exhibited optimal growth at about 45°C, pH 7, and 3–5% NaCl. It contained iso-C15:0 as the most abundant fatty acid and ubiquinone-8 as the only isoprenoid quinone. Its genomic DNA G+C content was 63.5 mol%. The strain did not require vitamins or other organic growth factors, and it grew on glucose, mannitol, and a variety of organic acids and amino acids as sole carbon sources. Characterization data, together with the results of a 16S rDNA-based phylogenetic analysis, indicated that strain T5054 could be classified as a new species in the genus Marinobacter. The name Marinobacter lutaoensis sp. nov. is proposed for this new bacterium. The type strain is T5054 (CCRC 17087; JCM 11179).Key words: Marinobacter lutaoensis, thermotolerant bacteria, halophile, marine bacteria.

Une bactérie marine hétérotrophe thermotolérante, désignée souche T5054, a été isolée d'une source thermale située sur la côte de Lutao, à Taïwan. Cette bactérie est un bâtonnet Gram-négatif aérobie stricte. Cultivées en milieu liquide, les cellules ne forment pas de spores, mais sont mobiles à l'aide d'un ou de quelques flagelles polaires. Il semble que des structures ressemblant à des pili soient produites aux deux pôles de la cellule. La souche T5054 a besoin de Na+ pour croître, et sa croissance optimale se situe à 45 °C, pH 7 et à 3–5 % de NaCl. L'acide gras iso-C15:0 est le plus abondant chez cette bactérie et l'ubiquinone-8 est la seule quinone isoprénoïde. Le contenu en ADN G+C génomique est de 63,5 mol %. Cette souche n'a pas besoin de vitamines ou d'autres facteurs de croissance organiques et elle pousse en présence de glucose, de mannitol et de divers acides aminés ou organiques comme sources uniques de carbone. Les données de caractérisation, couplées aux résultats de l'analyse phylogénétique de l'ADNr 16S, suggèrent que la souche T5054 pourrait être classée comme une nouvelle espèce du genre Marinobacter. Le nom Marinobacter lutaoensis sp. nov. est suggéré pour cette nouvelle bactérie. La souche type est T5054 (CCRC 17087; JCM 11179).Mots clés : Marinobacter lutaoensis, bactéries thermotolérantes, bactéries halophiles, bactéries marines.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: March 1, 2003

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  • Published since 1954, this monthly journal contains new research in the field of microbiology including applied microbiology and biotechnology; microbial structure and function; fungi and other eucaryotic protists; infection and immunity; microbial ecology; physiology, metabolism and enzymology; and virology, genetics, and molecular biology. It also publishes review articles and notes on an occasional basis, contributed by recognized scientists worldwide.
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