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 30 for “"dehalogenation"”.
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Reductive Dehalogenation by Aqueous Biochars
… completed work has demonstrated the reductive dehalogenation of TCS by microbially-reduced a�"BCs and their different reactivities dependent on parent materials and production processes. Experimental studies with model QNs and related thermodynamic/kinetic analysis have uncovered the critical …
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Microbial Growth On Anthropogenic Compounds By Reductive Dehalogenation Or Oxidation
… metabolic specialization for growth by reductive dehalogenation. Their genomes were larger then Dehalococcoides spp. genomes but smaller then the nearest sequenced phylogenic relative, further indicating specialization. The process of reductive dechlorination does not completely explain the flux …
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Reaction Rates For The Dehalogenation Of Trichloroethylene Using Various Types Of Zero-valent Iron
… linear first order rate plots from which dehalogenation rate constants were obtained. The rate constants were normalized by iron mass, solution volume, and surface area. The pretreatment techniques employed in this study, including ultrasonication and acid washing, demonstrated a …
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Redutive Dehalogenation of Chlorinated Alkanes by Novel Bacteria at the PetroProcessor of Louisiana Inc. Superfund Site
A reductively dehalogenating enrichment culture was established using chloroalkane-contaminated groundwater from the PetroProcessors of Louisiana, Inc. (PPI) Superfund site. Two novel, strictly anaerobic bacterial strains, designated as BL-DC-8 and BL-DC-9, were isolated from the enrichment …
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Design of an in situ bioremediation scheme of chlorinated solvents by reductive dehalogenation sequenced by cometabolic oxidation
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1996.
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Substrate interactions during the anaerobic biodegradation of 1,1,1-trichloroethane
… have adverse effects on human health. Reductive dehalogenation, in which cleavage of carbon-halogen bonds is accompanied by electron transfer to the halogenated substrate, is the most important mechanism for the anaerobic biodegradation of highly halogenated aliphatic hydrocarbons. The …
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Isolation and characterization of carbofuran and dicamba degrading bacteria
… aqueous medium. This was followed by a reductive dehalogenation reaction at the meta position of 3,6-dichlorosalicylic acid forming 6-chlorosalicylic acid. The metabolites were isolated using thin layer chromatography. Confirmation of metabolite identity was achieved using HPLC, and mass …
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Photochemical reactions of tetraorganoborate salts: Electron transfer-mediated photoreductions and alkylations and di-pi-borate rearrangements
… has been studied. The reaction leads to photo-dehalogenation in high yield. Sodium borohydride was also found to react photochemically with dicyanonaphthalene, leading to reduction products. These reactions are proposed to occur through an initial electron transfer step.
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Structure activity relationships of 1,8-disubstituted thioxanthenones.
… of this work it was established that selective dehalogenation of 1,8-dichloro-4-methylthioxanthen-9-one occurred and this resulted in the isolation of a series of 1-substituted alkylamino-alkylamino- and piperazinyl-5-methylthioxanthen-9-ones. The structures of these compounds were elucidated by …
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Halocarbon Reactions on the Chromium (III) Oxide (101̲2) Surface
… elimination similar to the Zn-catalyzed dehalogenation of vicinal dihalides to form alkenes. Some acetylene is also formed. The halo-alkenes CFCl=CH₂ and CF₂=CH₂ decompose to yield acetylene. Halogen removed from the molecules remains bound to the surface following TDS experiments and …
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The sodium borohydride reduction of organic halides and related derivatives in aprotic solvents
… among other factors. The same relative order of dehalogenation displayed by the alkyl halides was found. Polyhalomethanes such as carbon tetrachloride react with sodium borohydride to give the monohydro and dihydro compounds as the major products, the former predominating. The exact mechanism of …
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Removal of Perfluorooctane Sulfonate (PFOS) and Related Compounds From Industrial Effluents
… discharges of these pollutants. Reductive dehalogenation is widely applied to the degradation of highly chlorinated compounds. Hence, the susceptibility of PFOS and related compounds to biological and chemical reductive dehalogenation was evaluated in batch assays. PFAS were not reductively …
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Development of a Ni-Catalyzed Enantioselective Intramolecular Mizoroki- Heck Reaction for the Synthesis of Phenanthridinone Derivatives
… optimization enabling control of unwanted proto-dehalogenation and alkene reduction side products. The second section focuses on the development of enantioselective strategy with a newly synthesized chiral iQuinox-type bidentate ligand. In the third section, we describe efforts to explore the …
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Novel Resorcinol Platforms with Pharmaceutical Applications
… and hexameric derivatives. Halogenation and dehalogenation methods were put in place to provide additional variety to the derivatives accessible. A set of simplified structures, including benzophenones and xanthones, was also prepared for comparison. The polyvalent structure of the tetramers …
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Directed Phase Separation of Polymer Blends on Binary-Patterned Polymer Brushes
… the synthesis of patterned polymer brushes. Dehalogenation of the first brush, followed by deprotection, modification and a second polymerisation produced binary-patterned brushes. Unpatterned and patterned polymer brushes were characterised using ellipsometry, x-ray photoelectron …
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Characterization of Perphenazine and Scopolamine Aerosols Generated Using the Capillary Aerosol Generator
… concentration formulation (9mM) degraded with dehalogenation being the major pathway. The size of perphenazine aerosols was between 0.4 to 0.6µm. Changing the solute concentration produced only small changes (~0.2µm) in perphenazine aerosol particle size. The formulation flow rate did not …
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Spectroscopic Characterization of H93G Myoglobin Cavity Mutant As A Versatile Protein Scaffold For Modeling Native Heme Iron Coordination Structures and Investigation of the Structure and Mechanism of the Dual-Function Enzyme, Amphitrite Ornata Dehaloperoxidase
… DHP catalyzes the H2O2-dependent detoxifying dehalogenation of halophenols in their living environment. Although DHP is isolated in the catalytically inactive oxyferrous state, we find that, in the presence of 2,4,6-trichlorophenol substrate, a stoichiometric amount of H2O2 converts oxyferrous …
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Carbon dots as sustainable photocatalysts for organic synthesis
… for net-reductive reactions by example of dehalogenation of aryl-iodides, -bromides and -chlorides. The C-halogen bond was successfully cleaved for all three substrate groups despite the strong reduction potential required particularly for the bromides and chlorides. As the CD reduction …
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Bioremediation of Pcb Contaminated Surface Soil: A Microcosm Study
… of Aroclor 1242 was due to anaerobic dehalogenation. From another experiment, it was confirmed that removal of Aroclor 1242 was not due to evaporation losses during sample extraction. Toxicity of an aged Aroclor 1242 contaminated surface soil was evaluated on an aceticlastic …
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