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 94 for “"reductant"”.
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Novel reactions of a neutral organic reductant : reductive coupling and nanoparticle synthesis
… This super electron donor was used as a co-reductant for nickel-catalyzed reductive coupling of aryl halides in order for the reaction to be homogeneous and avoid the traditional co-reductant, zinc, previously reported for these Yamamoto-type dehalogenative couplings. Reductive coupling was …
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HC-SCR of NO\(_x\) emissions over Ag-AL\(_2\)O\(_3\) catalysts using diesel fuel as a reductant
… the use of H\(_2\) to activate diesel-type HC reductants. Numerous HC-SCR studies have been conducted (to date) by various authors and research groups in an effort to improve the low temperature (< 350 \(^\circ\)C) NO\(_x\) reduction activity of the catalyst, but mainly at laboratory scale, …
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On-Board-Reduktionsmittelherstellung zur NO x-Emissionsminderung bei Dieselfahrzeugen
… Diesel engine exhaust NOx emissions requires a reductant due to the composition (high oxygen content) of the exhaust gas. An efficient reductant is selected based on the comparison of literature data of different NOx reduction processes. A process for the on-board synthesis of this reductant is …
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3-Hydroxy-3-methylglutaryl-coenzyme A lyase: investigation of cysteines mediating intersubunit disulfide formation and regulation by thiol/disulfide exchange and discovery of an extramitochondrial homolog
… prompted the hypothesis that in the absence of reductant, cysteine 323 forms a disulfide bond with cysteine 323 on the adjacent monomer, blocking the substrate's access to the active site which results in diminished enzyme activity. The recently published crystal structure of the human enzyme …
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Synthesis and evaluation of radioactive gold nanoparticles for cancer treatment and imaging
… using a nontoxic and antitumor phytochemical reductant agent, Mangiferin that can be used to produce radioactive gold nanoparticles to treat and image prostate cancer while the second protocol uses sodium citrate as reductant agent to produce radioactive gold-199 nanoparticles that can be used …
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The effects of bicarbonate and mineral surfaces on uranium immobilization under anaerobic conditions
… non-ferric mineral surfaces in the presence of a reductant. Further, we seek to understand the role that NaHCO3, a natural groundwater buffer, has in the reductive geochemical transformations of U(VI) adsorbed on ferric and non-ferric mineral surfaces. Bench top studies were performed using 100 uM …
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PALLADIUM-BASED SYSTEMS IN HOMOGENEOUS CATALYSIS: EXPLORING NITROGEN LIGANDS FOR CO-MEDIATED REACTIONS
… the study investigates CO and its surrogates as reductant for the synthesis of different nitrogen-containing heterocycles. Furthemore, the use of guanidines as ligands in carbonylation and alkoxycarbonylation of olefins has been attempted.
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Relationships of soil test phosphorus with soil properties and phosphorus forms
… fraction. The distribution pattern of Fe-P, reductant soluble P, occluded P, residual P, and organic P fractions was directly related to soil Fe₂O₃ and clay contents. The Al-P content was not markedly influenced by the clay content or pH. It was concluded that Fe-P, a dominant labile P form …
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Copper-catalyzed conjugate reduction
… (PMHS) as the stoichiometric reductant. In this process, chiral 3-alkylcyclopentanones were isolated in high enantiomeric excess (ee =/> 92%) and in moderate to excellent yields (42-91%). Chapter 2. Kinetic resolution, with good selectivity factors (25-52), was achieved by …
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The Determination of Glucuronides in Biological Fluids by Lucigenin Chemiluminescence (beta-Glucuronidase, Glucuronic Acid, Immobilized Enzyme, (Hplc))
… and glucuronic acid (an important organic reductant in humans) was studied. The main goal of this project was to develop an analytical method for the quantitation of conjugated glucuronic acid (i.e., glucuronides) in physiological fluids using this chemiluminescence reaction as the …
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Characterization of Enzymes of the Methylcoenzyme M Reductase System From Methanobacterium Thermoautotrophicum and Identification of a Factor Required for Growth of Methanomicrobium Mobile
… (A2 and A3a), as well as ATP and a second reductant. Although component A2 has been purified to homogeneity, proteins comprising component A3a have only been partially resolved, and the functions of these components remain unknown.
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New strategies for the synthesis and homologation of complex aliphatic amines
… by zinc, is reported. The use of a metal-reductant-mediated mechanism provided the solution to many of the residual problems associated with the first-generation light-mediated CAA reaction, developed by the Gaunt group. The advances included addressing inherent scalability issues and …
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Disulfide Cross -Linking in Protein Microspheres
… microsphere shell. Treatment with a disulfide reductant established that disulfide bonds are the covalent cross-link between protein molecules. Mass spectrometry has shown that inter-protein disulfide bonding is not random. The disulfide bonds that do form reflect the electrostatic surfaces of …
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Electrophilic C(sp²)–H Cyanation with Inorganic Cyanate (OCN⁻) by Pᴵᴵᴵ/Pⱽ=O-Catalyzed Phase Transfer Activation
… achieved by the usage of a terminal hydrosilane reductant. These results demonstrate the feasibility of deoxyfunctionalization of insoluble inorganic salts by Pᴵᴵᴵ/Pⱽ=O catalyzed phase transfer activation, as exemplified by C(sp²)–H cyanation with NaOCN as the “CN⁺” source.
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Ribonucleotide reduction and redox regulation in Archaea : surprising twists on a common theme
… inability of taTrR to use NADPH or NADH as a reductant, we carried out a complete electrochemical characterization, which ruled out redox potential as the source of this non-reactivity. A 2.35 A resolution structure of taTrR, also presented here, shows that despite the overall structural …
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Characterisation of anode supported microtubular SOFC process on pure methane reduction and operation
… microtubular SOFCs using methane as both reductant and fuel. The results were compared to those from optimised operation using hydrogen. To measure mechanical strength, the three point bending test was employed. Temperature programmed oxidation (TPO) results were investigated to measure …
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Circadian, Light and Low Temperature Regulation of Nitrate Reductase in Tomato
… protein and activity. The untimely depletion of reductant and TCA carbon skeletons as well as accumulations of toxic byproducts of nitrogen assimilation that this would cause is likely to be detrimental to the plant.
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Calibration and performance of a selective catalytic reduction (SCR) bench rig for NOx̳ emissions control
… maintaining a 1:1 ratio between NOx and NH3 reductant. The catalyst was found to have a peak deNOx efficiency of 99.8% between 250 'C and 300 'C, and maintained 98% efficiency with NO/NO2 < 1, while minimizing pollutant N20 generation.
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SYNTHESIS OF N-HETEROCYCLES VIA PALLADIUM-CATALYZED REDUCTIVE CYCLIZATION REACTIONS OF NITROARENES AND NITROALKENES USING FORMIC ACID DERIVATIVES AS CO SURROGATES
… for more than four decades using CO as a cheap reductant, but it is still a fascinating area for research and advancements. On the other hand, using toxic CO gas is accompanied by many disadvantages. Thus, the thesis focuses on the use of phenyl formate and formic acid as cheap, affordable, …
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The study of the degradation of hexabromocyclododecane in a heterogeneous system containing Fe(II) adsorbed to the iron oxide Hematite.
… oxide system has shown to be a potent reductant in the transformation of organic contaminants with relatively water soluble organic contaminants. There currently aren’t many studies involving hydrophobic organic contaminants, such as HBCDD, in this reducing Fe(II)/iron oxide system. The …
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