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Isolation and Nitrate Reduction Characteristics of Aerobic Denitrifier Pseudomonas sp. DN-9

호기성 탈질균 Pseudomonas sp. DN-9의 분리 및 질산염 환원 특성

Cho Sun-Ja;Jung Yong-Ju;Lee Sang-Joon
조순자;정용주;이상준

  • Published : 2005.10.01

Abstract

From sludge of S municipal wastewater treatment plant in Busan, Korea, we isolated the denitrifier DN-9 which showed the ability of denitrification under aerobic conditionby the color change and gas formation in liquid culture with Giltay medium. The isolated strain was identified as Pseudomonas sp. DN-9 on the basis of the morphological, physiological, biochemical and nucleotide sequence analysis of l6S rRNA. The isolated strain, Pseudomonas sp. DN-9, has cytochrome $cd_1$, nirS of nitrite reductase. By the co-existance of additional ammonium and nitrate ion, the strain was not affected largely on growth in SL series broth. It seemed the result of denitrification. Although Pseudomonas sp. DN-9 has a good nitrate reduction activity under aerobic condition, the activity is less than Pseudomonas stutzeri in same cultivation condition. However, Escherichia coli had little the activity of aerobic denitrification and Pseudomonas putida showed lower activity of aerobic denitrification than Pseudomonas sp. DN-9 and Pseudomonas stutzeri in this study.

Keywords

Aerobic denitrifier;Nitrate reduction;Pseudomonas sp.

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