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Applied and Environmental Microbiology, December 1998, p. 5042-5045, Vol. 64, No. 12
0099-2240/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Effects of Halides on Plasmid-Mediated Silver Resistance in Escherichia coli

Amit Gupta,* Maria Maynes,dagger and Simon Silver

Department of Microbiology and Immunology, University of Illinois, Chicago, Illinois 60612-7344

Received 14 September 1998/Accepted 5 October 1998

Silver resistance of sensitive Escherichia coli J53 and resistance plasmid-containing J53(pMG101) was affected by halides in the growth medium. The effects of halides on Ag+ resistance were measured with AgNO3 and silver sulfadiazine, both on agar and in liquid. Low concentrations of chloride made the differences in MICs between sensitive and resistant strains larger. High concentrations of halides increased the sensitivities of both strains to Ag+.

* Corresponding author. Mailing address: Department of Microbiology and Immunology, University of Illinois, 835 S. Wolcott Ave., Room E-703, Chicago, IL 60612-7344. Phone: (312) 996-3363. Fax: (312) 996-6415. E-mail: agupta{at}uic.edu.

dagger Present address: Division of Biology and Biomedical Sciences, Washington University, St. Louis, MO 63110.

Applied and Environmental Microbiology, December 1998, p. 5042-5045, Vol. 64, No. 12
0099-2240/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.


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