Global ETD Search
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 152 for “"biphenyl"”.
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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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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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Rhizosphere/Soil Microorganisms in the Phytoremediation of Biphenyl and Dioxane
Biphenyl and dioxane biodegradation by poplar and willow rhizosphere microorganisms was studied in a phytoremediation test-plot contaminated with biphenyl and dioxane. A dioxane-degrading consortium enriched from the contaminated rhizosphere soil did not use dioxane as the sole source of carbon and …
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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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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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Suzuki-Miyaura mediated biphenyl synthesis: a spotlight on the boronate coupling partner
… of biological activities. This explains why biphenyls are widely encountered in medicinal chemistry as a privileged scaffold. The palladium-catalysed Suzuki-Miyaura (SM) coupling is one of the most important and efficient strategies for the synthesis of symmetrical and unsymmetrical biaryl …
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Exploring Sulfur Recovery in a Eutectic Mixture of Biphenyl and Diphenyl Ether
… process was explored in a eutectic solvent of biphenyl and diphenyl ether. Sulfur conversions up to 99.96% could be achieved within the solvent over commercial alumina and titania catalyst for a simulated tail-gas feed containing up to 5% sulfur species. A temperature range of 120 to 150 °C was …
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Polychlorinated biphenyl (PCB) contamination in Pittsfield, Massachusetts : an investigation of public participation
… 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 confidentiality, preventing …
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Design, synthesis and mode of action of short biphenyl and anthranilamide cationic peptidomimetics
… peptidomimetics that employ 3'-amino-[1, 1 '-biphenyl)-3-carboxylic acid and anthranilic acid backbones segregated by hydrophobic and cationic groups. The biphenyl peptidomimetic compounds showed that simple diaminoethanes and their respective guanidine cationic groups were sufficient to mimic …
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A study of the binary systems salicylic acid-biphenyl and salicylic acid-diphenylamine
1. From a study of the system salicylic acid-biphenyl it was concluded that there was no compound formation in the system. The solution is very nearly ideal, having an eutectic temperature of 67.6℃ at a mole fraction of .903 for the biphenyl. 2. The system salicylic acid-diphenylamine was studied …
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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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