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RECORD NUMBER: 49 OF 125

OLS Field Name OLS Field Data
Main Title Environmental Significance of the Potential for 'mer' (Tn21)-Mediated Reduction of Hg (2+) to Hg in Natural Waters.
Author Barkay, T. ; Liebert, C. ; Gillman, M. ;
CORP Author Technical Resources, Inc., Gulf Breeze, FL.;Environmental Research Lab., Gulf Breeze, FL.
Publisher c1989
Year Published 1989
Report Number EPA-R-813589; EPA/600/J-89/166 ; CONTRIB-660
Stock Number PB90-129511
Additional Subjects Aquatic microbiology ; Toxicology ; Mercury ; Natural waters ; Fresh water ; Salt water ; Deoxyribonucleic acids ; Reprints ; Water pollution effects(Animals) ; Environmental impact ; Microbial sensitivity tests ; Bacterial genes ; Biotransformation
Holdings
Library Call Number Additional Info Location Last
Modified
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Status
NTIS  PB90-129511 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 03/10/1990
Collation 9p
Abstract
The role of mer(Tn21) in adaptation of aquatic microbial communities to Hg2+ was investigated. Elemental mercury was the sole product of Hg2+ volatilization by freshwater and saline microbial communities. Bacterial activity was responsible for biotransformation because most microeukaryotes did not survive the exposure conditions, and removal of larger microbes (> 1 microgram) from adapted communities did not significantly (P > 0.01) reduce Hg2+ volatilization rates. DNA sequences homologous to mer(Tn21) were found in 50% of Hg2+ resistant bacterial strains representing two freshwater communities, but in only 12% of strains representing two saline communities (difference highly significant, P < 0.001). Thus, mer(Tn21) played a significant role in Hg2+ resistance among strains isolated from freshwaters where microbial activity had a limited role in Hg2+ volatilization. In saline environments where microbially mediated volatilization was the major mechanism of Hg2+ loss, other bacterial genes coded for the biotransformation. (Copyright (c) 1989 American Society for Microbiology.)