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      Isolation and characterization of a thermotolerant bacterium Ralstonia sp. strain PHS1 that degrades benzene, toluene, ethylbenzene, and o-xylene.

      Applied Microbiology and Biotechnology
      Benzene, metabolism, Benzene Derivatives, Cupriavidus necator, genetics, isolation & purification, RNA, Ribosomal, 16S, chemistry, Toluene, Xylenes

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          Abstract

          A thermotolerant bacterium, designated as PHS1, was isolated from a hot spring in Pohang, Korea, on the basis of its ability to grow on benzene, toluene, ethylbenzene, and xylenes (BTEX) as a sole carbon source. Strain PHS1 is a gram-negative, rod-shaped aerobe and grows optimally at 42 degrees C and pH 7.2. According to 16 S rDNA analysis, strain PHS1 showed highest similarity to Ralstonia eutropha (previously named Alcaligenes eutrophus). Unlike its closest known Ralstonia species, however, strain PHS1 was able to utilize toluene, ethylbenzene, o-xylene, and both m- and o-cresol. The degradation of o-xylene by strain PHS1 is particularly important, since o-xylene is a compound of considerable environmental interest, owing to its recalcitrance; and very few microorganisms have been reported to utilize o-xylene as a sole carbon source. It was found that strain PHS1 transformed o-xylene to 2,3-dimethylphenol through direct oxygenation of the aromatic ring. The unique properties of strain PHS1, such as thermotolerance and the ability to degrade o-xylene, may have important implications for the treatment of BTEX-contaminated industrial effluents.

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          Author and article information

          Journal
          11499943
          10.1007/s002530100608

          Chemistry
          Benzene,metabolism,Benzene Derivatives,Cupriavidus necator,genetics,isolation & purification,RNA, Ribosomal, 16S,chemistry,Toluene,Xylenes

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