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Cadmium resistant Enterobacter cloacae and Klebsiella sp. isolated from industrial effluents and their possible role in cadmium detoxification

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Abstract

Three bacterial strains, two of Klebsiella sp. and one Enterobacter cloacae were isolated from industrial effluents of chemical and textile industries. They showed high efficiency in removing cadmium (Cd2+) from the medium. When 100 μg/ml of Cd was added to the medium, the three isolates namely CMBL-Cd1, CMBL-Cd2 and CMBL-Cd3 removed or accumulated 86%, 87% and 85% of Cd, respectively, from the medium within 24h. Plasmids were detected in all the three strains. Plasmids of E. cloacae (pCBL1) and Klebsiella sp. (pCBL2 and pCBL3), estimated to be 6.6kb, were used to transform Escherichia coli C600. The transformed E. coli cells showed elevated resistance to Cd. Ethidium bromide curing indicated the presence of the Cd resistance gene on the plasmid. Resistance of the isolated strains against other metals like chromium (cr6+) and lead (pb2+) and a number of antibiotics was also checked. Cured strains showed lowered resistance against Cr and some antibiotics. This again supported the indication of the presence of Cd, Cr and some antibiotics resistance genes on plasmids.

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Authors and Affiliations

  1. Cell and Molecular Biology Laboratory, Department of Zoology, University of the Punjab, Lahore, Pakistan

    Riazul Haq, Sayyed Kaleem Zaidi & A.R. Shakoori

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  1. Riazul Haq
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  2. Sayyed Kaleem Zaidi
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  3. A.R. Shakoori
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Haq, R., Zaidi, S.K. & Shakoori, A. Cadmium resistant Enterobacter cloacae and Klebsiella sp. isolated from industrial effluents and their possible role in cadmium detoxification. World Journal of Microbiology and Biotechnology 15, 283–290 (1999). https://doi.org/10.1023/A:1008986727896

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