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Environmental Engineering Research 1998;3(2): 67-78.
Isolation and Characterization of Polychlorinated Biphenyls (PCBs) Degrading Bacteria from a Municipal Sewage Treatment Plant
Kyung-Su Na1, Yong-Woon Lee1, Jin-Sook Lee2, Jae-Suk Lee2, Motoki Kubo3, and Seon-Yong Chung1
1Department of Environmental Engineering, Chormam National University, Kwangju, 500-757 Korea
2Department of Materials Science and Engineering, Kwangju Institute of Science and Technology, Kwangju, 506-303 Korea
3Department of Bio Science & Technology, Faculty of Science and Engineering, Ritsumeikan University, 1-1-1 Nojihigasbi, Kusatsu-shi, Shiga-ken, 525-77 Japan
Corresponding Author: Kyung-Su Na ,
Received: September 19, 1997;  Accepted: April 19, 1998.
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ABSTRACT
Polychlorinated biphenyls(PCBs) degrading bacteria are isolated from a municipal sewage treatment plant after the culture in a minimal medium containing biphenyl and p-chlorobiphenyl as the sole carbon source, and 14 strains that can effectively degrade PCBs under the stress of unfavorable conditions are selected by using the variety of aromatic compounds and organic solvents. The selected isolates are identified as Pseudomonas (strains SY1 to SY8) and Alcaligenes sp. (strains KS1 to KS6) groups based on their morphological and physiological characteristics. In addition, the enzyme activity is investigated on the substrates of meta-ring cleavage dioxygenase in the isolates. The results show the great different characterizations between Pseudomonas and Alcaligenes sp. groups. Also, the isolated strains are tested to examine the organic solvent tolerance. The results show that some of strains can grow in xylene and the others can grow in the organic solvent of the logP value of 3.6 or over but not below the logP value of 3.6.
Keywords: Polychlorinated biphenyls(PCBs) | Organic solvent tolerance | logP | 2.3-dihydroxybiphenyl dioxygenase (2.3DHBD) | meta-ring cleavage dioxygenase
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