Journal ArticleDOI
Polychlorinated Biphenyl Dechlorination in Aquatic Sediments
John F. Brown,Donna L. Bedard,Michael J. Brennan,James Claude Carnahan,Helen Feng,Robert E. Wagner +5 more
TLDR
The polychlorinated biphenyl (PCB) residues in the aquatic sediments from six PCB spill sites showed changes in PCB isomer and homolog (congener) distribution that indicated the occurrence of reductive dechlorination.Abstract:
The polychlorinated biphenyl (PCB) residues in the aquatic sediments from six PCB spill sites showed changes in PCB isomer and homolog (congener) distribution that indicated the occurrence of reductive dechlorination. The PCB dechlorinations exhibited several distinct congener selection patterns that indicated mediation by several different localized populations of anaerobic microorganisms. The higher (more heavily chlorinated) PCB congeners that were preferentially attacked by the observed dechlorination processes included all those that are either pharmacologically active or persistent in higher animals. All the lower (less heavily chlorinated) PCB congeners formed by the dechlorinations were species that are known to be oxidatively biodegradable by the bacteria of aerobic environments.read more
Citations
More filters
Journal ArticleDOI
Polychlorinated Biphenyls (PCBs): Environmental Impact, Biochemical and Toxic Responses, and Implications for Risk Assessment
TL;DR: Analysis of the results of laboratory animal and wildlife studies suggests that the predictive value of TEQs for PCBs may be both species- and response-dependent because both additive and nonadditive (antagonistic) interactions have been observed with PCB mixtures.
Toxicological profile for polychlorinated biphenyls (PCBs)
Obaid Faroon,James N. Olson +1 more
TL;DR: A toxicological profile for PCBs, Draft for Public Comment, was released in December 1998 as discussed by the authors, which supercedes any previously released draft or final profile, but no less than once every three years.
Journal ArticleDOI
Microbial reductive dehalogenation.
William W. Mohn,James M. Tiedje +1 more
TL;DR: Agarwal et al. as mentioned in this paper used Desulfomonile tiedjei DCB-1 as a model to understand reductive dehalogenating organisms in undefined, syntrophic anaerobic communities.
Journal ArticleDOI
Polychlorinated biphenyls and their biodegradation
TL;DR: A review of literature and studies on the biodegradation of PCBs is presented in this article, where the degradation route is dependent on the complexity of the PCB congener coupled with the type of microorganism employed and the interaction among the microorganisms.
Journal ArticleDOI
Aerobic and Anaerobic Biodegradation of PCBs: A Review
TL;DR: Current research involving the aerobic biodegradation of PCBs (natural strains, recombinant organisms, and soil applications) and the dramatic new results demonstrating microbial reductive dechlorination of even highly chlorinated PCBs under anaerobic conditions are summarized.
References
More filters
Journal ArticleDOI
Rapid assay for screening and characterizing microorganisms for the ability to degrade polychlorinated biphenyls.
TL;DR: A rapid assay is designed that assesses the polychlorinated biphenyl (PCB)-degradative competence and congener specificity of aerobic microorganisms, identifies strains capable of degrading highly chlorinated bipenyls, and distinguishes among those that degrade PCBs by alternative pathways.
Journal ArticleDOI
Immunochemical Quantitation of Cytochrome P-450 Isozymes and Epoxide Hydrolase in Liver Microsomes from Polychlorinated or Polybrominated Biphenyl-treated Rats A STUDY OF STRUCTURE-ACTIVITY RELATIONSHIPS*
TL;DR: Unprecedentedly high levels of cytochromes P- 450a, P-45Ob + P-450e, and P450d were observed following treatment of rats with 3,4,5,3’,4’ ‘tetrachlorobiphenyl,’ and the repression of a form or forms of cy tochrome P -450 normally present in control rats were apparently part of a pleiotypic response to certain toxic halogenated
Journal ArticleDOI
Dehalogenation: a novel pathway for the anaerobic biodegradation of haloaromatic compounds.
TL;DR: The results suggest that reductive dehalogenation of aromatics could be important in removal of some chlorinated xenobiotics from the environment.
Journal ArticleDOI
Anaerobic biodegradation of phenolic compounds in digested sludge.
TL;DR: Of the 12 monosubstituted phenols studied, only p-chlorophenol and o-cresol were not significantly degraded during an 8-week incubation period, which indicated that dechlorination was the initial degradation step.
Journal ArticleDOI
Extensive degradation of Aroclors and environmentally transformed polychlorinated biphenyls by Alcaligenes eutrophus H850.
TL;DR: A strain of Alcaligenes eurtrophus, designated H850, is isolated and characterized that rapidly degrades a broad and unusual spectrum of polychlorinated biphenyls (PCBs) including many tetra- and pentachlorobipenyls and several hexachlorOBiphenylS.