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Applied and Environmental Microbiology, July 2000, p. 3083-3087, Vol. 66, No. 7
0099-2240/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

A New Klebsiella planticola Strain (Cd-1) Grows Anaerobically at High Cadmium Concentrations and Precipitates Cadmium Sulfide

Pramod K. Sharma,1,dagger David L. Balkwill,2 Anatoly Frenkel,1 and Murthy A. Vairavamurthy1,*

Department of Applied Science, Brookhaven National Laboratory, Upton, New York 11973,1 and Biological Science Department, Florida State University, Tallahassee, Florida 323062

Received 27 January 2000/Accepted 25 April 2000

Heavy metal resistance by bacteria is a topic of much importance to the bioremediation of contaminated soils and sediments. We report here the isolation of a highly cadmium-resistant Klebsiella planticola strain, Cd-1, from reducing salt marsh sediments. The strain grows in up to 15 mM CdCl2 under a wide range of NaCl concentrations and at acidic or neutral pH. In growth medium amended with thiosulfate, it precipitated significant amounts of cadmium sulfide (CdS), as confirmed by x-absorption spectroscopy. In comparison with various other strains tested, Cd-1 is superior for precipitating CdS in cultures containing thiosulfate. Thus, our results suggest that Cd-1 is a good candidate for the accelerated bioremediation of systems contaminated by high levels of cadmium.

* Corresponding author. Mailing address: Department of Applied Science, Brookhaven National Laboratory, Bldg. 815, Upton, NY 11973. Phone: (631) 344-5337. Fax: (631) 344-5526. E-mail: vmurthy{at}bnl.gov.

dagger Present address: Millipore Corporation, Bioprocess Division, Bedford, MA 01730.

Applied and Environmental Microbiology, July 2000, p. 3083-3087, Vol. 66, No. 7
0099-2240/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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