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  • Title: [Isolation and characterization of new species hydrogen producing bacterium Ethanologenbacterium sp. strain X-1 and its capability of hydrogen production].
    Author: Xing DF, Ren NQ, Li QB.
    Journal: Wei Sheng Wu Xue Bao; 2004 Dec; 44(6):724-8. PubMed ID: 16110947.
    Abstract:
    To obtain hydrogen-producing bacterium of high efficiency, a strain X-1 of hydrogen-producing bacteria was isolated from the continuous stirred-tank reactor (CSTR) by anaerobic Hungate technique. The Comparative sequence analysis of 16S rDNA showed that homology of strain X-1 with Clostridium cellulose and Acetanaerobacterium elongatum is less than 94%. All sequence alignment of 16S-23S rDNA intergenic spacer regions (ISR) indicated displayed that consensus region is tRNA(Ala), and tRNA(Ile), variable region is not homologous. Morphological, physic-biochemical character, and comparative sequence analysis of 16S rDNA and 16S-23S rDNA ISR indicated that strain X-1 belong to new genus named Ethanologenbacterium gen. nov.. Strain X-1 is facultative anaerobe bacillus; its main fermentative products are acetic acid, ethanol, H2 and CO2. The metabolic character of strain X-1 is typical ethanol type fermentation. Its capability of hydrogen production was measured in the batch culture experiment. X-1's maximum specific hydrogen producing rate is 28.3 mmol H2/( g dry cell x h) at pH 4.0 and 36 degrees C. Result of identify and analysis of hydrogen production ability demonstrated strain X-1 belong to new genus of high hydrogen-producing bacteria.
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