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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 32 for “"polychlorinated biphenyl"”.
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Application of Polychlorinated Biphenyl Signatures for Environmental Fingerprinting
Polychlorinated Biphenyls (PCBs) are a group of 209 ‘man-made’ chlorinated organic compounds that were widely used in the 20th century for a variety of industrial uses. PCBs were first commercially produced in the 1929 and were manufactured until the 1980s when their use was phased out due to …
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A field screening method for polychlorinated biphenyl compounds in water
The objective of this study was to develop a simple, inexpensive and rapid procedure for determination of PCBs in water. There was special interest in developing a field-screening procedure for aqueous extracts resulting from a soil remediation procedure; the extracting liquid typically contains …
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Isolation and Identification of Biphenyl and Polychlorinated Biphenyl Degrading Microbes
… the I-10 overpass is heavily contaminated with biphenyl and polychlorinated biphenyls (PCBs), carcinogenic aromatic hydrocarbons that have a deleterious impact on the environment. While typically recalcitrant to most forms of environmental degradation, biphenyl and PCBs compounds are known to …
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Polychlorinated biphenyl effects on avian hepatic enzyme induction and thyroid function
Polychlorinated biphenyls (PCBs) decrease thyroid function in rats and mice by inducing activity of a liver enzyme, uridine diphosphate-glucuronosyltransferase (UDP-GT), thereby increasing thyroxine (T4) clearance. This loss of T4 can lead to hypothyroidism. In this study, an assay was validated …
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Polychlorinated biphenyl dechlorination with palladized magnesium - Development of a sediment remediation technology
… observed in the HSR sediment, mostly pentachlorobiphenyls or lesser chlorinated congeners, and was also confirmed in experiments conducted with single PCB congeners BZ 194 and 204 in pure solvents, indicating that dechlorination was occurring. A stepwise dechlorination process was suggested in …
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Polychlorinated biphenyl (PCB) contamination in Pittsfield, Massachusetts : an investigation of public participation
… General Electric, regarding extensive PCB (polychlorinated biphenyl) contamination in Pittsfield, Massachusetts. In this case, government acted as a trustee on behalf of the public's interests in the negotiations. All individuals involved in the negotiation signed contracts of …
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Neurobehavioral and neurochemical effects of ortho-substituted polychlorinated biphenyl congeners in perinatally exposed rats
Polychlorinated biphenyls (PCBs) are persistent contaminants in the environment. PCBs are lipophilic and from the environment bioaccumulate in living organisms. People are exposed to PCBs through the food chain. PCB exposure during development of the central nervous system (CNS) results in …
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Effects of a polychlorinated biphenyl in mice caged at different densities and fed at different nutritional levels
A series of experiments was conducted to assess the physiological effects of dietary PCB (Aroclor 1254) ingestion in white mice (Mus musculus) and in laboratory-reared white-footed mice (Peromyscus leucopus), and to determine if these effects were aggravated by group-caging or feed restriction. The …
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The Effects of Two Polychlorinated Biphenyl Mixtures on Honey Bee (Apis Mellifera) Foraging Behavior and Hypopharyngeal Gland Development
The honey bee is a novel model in which to study physiological and behavioral changes that may have a hormonal influence. This dissertation focused on the effects of two PCB mixtures, Aroclor 1242 and 1254, on the European honey bee, Apis mellifera, as there is evidence that these compounds disrupt …
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Comparison of polychlorinated biphenyl profiles in rat, fish and human tissues; the effects of consuming Great Lakes fish
The food chain transfer of Polychlorinated Biphenyl (PCB) congeners was assessed in rat and human tissue after the consumption of contaminated Great Lakes fish. Fish from Lake Superior (LS), Lake Michigan (LM), and Lake Huron (LH) were examined for either total PCB or specific congener …
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Bacterial Challenge in Lumbricus Terrestris: A Terrestrial Invertebrate Immunotoxicity Model.
… immunotoxic effects from exposure to specific polychlorinated biphenyl congeners. Earthworms were inoculated with Aeromonous hydrophila, establishing a 10-day LD50. In vitro assays for effects of PCBs on phagocytosis agreed with mammalian studies, demonstrating potent suppression of …
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Are PCBS in phytoplankton and zooplankton at equilibrium with the water in which they live?
Food chain bioaccumulation of polychlorinated biphenyls (PCBs) can result in harmful concentrations within higher trophic level organisms such as fish and humans. It is important to consider how the concentrations of PCBs in phytoplankton and zooplankton affect higher trophic organisms. It was …
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Development of a dye sensitized photochemical reduction process for the degradation of polychlorinated biphenyls
A method has been developed that can photoreduce polychlorinated biphenyl (PCB) to biphenyl with great speed and efficiency as well as at relatively low cost. This process uses visible light, generated by ordinary incandescent light bulbs, which is absorbed by a common dye sensitizer. The dye …
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RECOVERY-RD: The Development of a Biotransformation Model for Sediment Systems Contaminated with PCBs
… the biotransformation processes associated with Polychlorinated Biphenyl (PCB) compounds in contaminated sediments for a variety of aquatic environments, including rivers and marine systems. RECOVERY-RD is intended as a screening tool for evaluating the impact of engineered sediment caps on …
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Polyethylene devices and the effects of sediment resuspension on the cycling of PAHs and PCBs in the lower Hudson Estuary
… measured, and 3) pyrene and 2,2',5,5'-tetrachlorobiphenyl (PCB #52), a polychlorinated biphenyl (PCB), concentrations were measured in the lower Hudson Estuary so that the input of these chemicals as a result of sediment resuspension could be compared to modeling expectations and the contribution …
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Investigation of polyethlyene passive samplers' efficacy in deducing sediment pore water concentrations of PCBs
Polychlorinated biphenyl compounds (PCBs) were manufactured between 1929 and 1977 as heat exchange fluids, flame retardants, and pesticide extenders, among other uses. About 450 million pounds of PCBs are estimated to have entered the environment since manufacture. Assessing the hazard posed by …
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Role of ryanodine receptors in neuronal calcium signalling and growth control
… ryanodine receptor (RyR); chlorom- cresol (CMC), polychlorinated biphenyl 95 (PCB), ryanodine, caffeine, and that of the inositol-1 ,4 ,5-trisphosphate receptor (IP<sub>3</sub>R), bradykinin, effectively couple to the activation of Ca<sup>2+</sup> influx in these cells. The Ca<sup>2+</sup> influx …
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