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Isolation and Characterization of Sulfur-oxidizing Denitrifying Bacteria Utilizing Thiosulfate as an Electron Donor  

Oh, Sang-Eun (Division of Biological Environment, Kangwon National University)
Joo, Jin-Ho (Division of Biological Environment, Kangwon National University)
Yang, Jae E (Division of Biological Environment, Kangwon National University)
Publication Information
Korean Journal of Soil Science and Fertilizer / v.39, no.6, 2006 , pp. 409-414 More about this Journal
Abstract
Sulfur-oxidizing bacteria were enumerated and isolated from a steady-state anaerobic master culture reactor (MCR) operated for over six months under a semi-continuous mode and nitrate-limiting conditions using thiosulfate as an electron donor. Most are Gram-negative bacteria, which have sizes up to 12 m. Strains AD1 and AD2 were isolated from the plate count agar (PCA), and strains BD1 and BD2 from the solid thiosulfate/nitrate medium. Based on the morphological, physiological, FAME and 16S rDNA sequence analyses, the two dominant strains, AD1 and AD2, were identified as Paracoccus denitrificans and Paracoccus versutus (formerly Thiobacillus versutus), respectively. From the physiological results, glucose was assimilated by both strains AD1 and AD2. Heterotrophic growth of strains AD1 and AD2 could be a more efficient way of obtaining a greater amount of biomass for use as an inoculum. Even though facultative autotrophic bacteria grow under heterotrophic conditions, autotrophic denitrification would not be reduced.
Keywords
Autotrophic denitrification; Sulfur-oxidizing bacteria; Denitrification; Thiobacillus;
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