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 34 for “"dithionite"”.
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Enhanced Dechlorination of 1,2-Dichloroethane by Coupled Nano Iron-Dithionite Treatment
… nZVI (stabilized or non-stabilized) with sodium dithionite were conducted for the degradation of 1,2-DCA. These experiments have yielded up to 92 % degradation of the initial 1,2-DCA concentration over the course of a year. Observed pseudo-first order rate constants (kobs) range from 3.8 x 10-3 …
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Spectroelectrochemical Studies of the Reductive Intermediates of Anthraquinone-2,6-Disulfonate in Aqueous Media
… of anthraquinone-2,6-disulfonate (AQDS) by dithionite combine to form a transient dimer which has shown to give rise to a series of charge transfer bands in the visible range (600-750 nm). Additional wavelengths associated with these intermediate species have been observed at wavelengths …
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Studies of arsenic, copper and lead in the soils of the Tamar Valley
… are indicated by the combination of sodium dithionite and nitric acid extraction techniques, from which elemental association with secondary iron and sulphide minerals may be determined. Enhanced levels resulting from aerial pollution were found in a zone a few hundred metres around mine …
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Abiotic nitrate reduction by redox activated iron-bearing smectites
… using SWa-1 chemically reduced by sodium dithionite. Analysis of ferrous and total iron concentrations in the reduced clay was performed with a colorimetric 1,10-phenanthroline method before and after reaction with a dilute nitrate solution to observe reoxidation of the clay structure. …
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Chemical heterogeneity of glaciofluvial deposits: Outcrop study and implications for reactive transport
… carbon content, magnetic mineral content, and dithionite citrate-extractable iron, manganese, and aluminum content were measured in the laboratory.</p><p>Fifty-seven percent of the variation in Pb2+ sorption can be explained by a linear combination of sediment permeability and extractable iron, …
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Glutamine Phosphoribosyl Pyrophosphate Amidotransferase From Bacillus Subtilis: Iron-Sulfur Biochemistry and Enzymology
… The cluster was reduced poorly with sodium dithionite, but was reduced readily by photoreduction with 5-deazaflavin. Photoreduction of the native enzyme resulted in formation of the +1 redox state of the cluster. The reduced enzyme was EPR silent. Examination of the reduced enzyme by …
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Infrared Study of Oxidized and Reduced Nontronite and Ca-K Competition in the Interlayer
… when the clay was chemically reduced with sodium dithionite. When the reduced clay was reoxidized, Ca, again, displayed a preference over K, but the ratio of Ca to K was not restored to the original extent. The selectivity of cations in the interlamaller space of SWa-1 also depended on the ratio …
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Characterization of Monomeric Human Cytochrome P450 3A4 and Cytochrome P450 Reductase in Nanoscale Phospholipid Bilayer Discs
… characterized for substrate binding, rates of dithionite dependent reduction, NADPH utilization rates, and testosterone metabolic rates as a function of substrate concentration. This novel methodology of incorporating cytochrome P450s during the self-assembly process to produce soluble …
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Study of Nitrogenase Cofactors bound to Nitrogenase Carrier Proteins
… is very similar for both cofactors in the dithionite-reduced state. Overall, this thesis reports the development and utilization of the site-selective ⁵⁷Fe-labeling in conjunction with the use of carrier protein NifX to study electronic structure of nitrogenase cofactors.
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Synthetic Materials with Redox-Triggers for Imaging and Drug Delivery
… was evaluated with a chemical reductant, sodium dithionite demonstrating that the significant amount of paclitaxel was released at a simulated redox-state compared to the control. Cell viability studies revealed that the polymer was non-toxic and the nanoparticles and micelles could release …
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Development of a Model for the Kinetics and Mechanism of Nitrogenase
… include: an analysis of Fe protein reduction by dithionite; the characterization of a form of Fe protein reduced to the all-ferrous [4Fe-4S]0 state with a novel spin S = 0 state by the <em>in vivo</em> reductant flavodoxin; and a novel account of salt effects that weaken the nitrogenase complex …
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Nitric Oxide in the Cytotoxicity of Metronidazole Against Trichomonas Vaginalis
… for one hour at 37°C with (1) sodium dithionite and (2) the enzymatic mixture consisting of ferredoxin oxidoreductase, ferredoxin, and NADPH, NO was only detected by EPR following the addition of ascorbic acid. On the other hand, the nitro anion radical was consistently produced at …
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The Effects of Iron Oxidation State on Surface Chemistry and Structure of Iron-Bearing Smectites: Cation Fixation and Selectivity, Structural Iron Environment, and Dissolution
… by Shewanella oneidensis or by pH-buffered dithionite. The dissolution of smectites by bacterial reduction without organic acids was nonstoichiometric and insignificant to moderate levels. In general, the changes in smectite structure during redox reactions indicates that redox processes in …
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Studies on the Proteolytic Activation of the Membrane Enzyme, Pyruvate Oxidase
… Reduction of the flavoenzyme, either by dithionite or by the simultaneous presence of substrate, pyruvate, and cofactor, thiamin pyrophosphate, is required for proteolytic activation to occur. The enzyme is proteolytically inactivated in the absence of thiamin pyrophosphate regardless of …
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Nitrate Sorption in the Soils of the Coweeta Hydrologic Laboratory
… values for Alo, Mno and the ration of oxalate to dithionite extractable Fe (Feo/Fed), suggesting that the soils at higher elevations are at earlier stages of pedogenic development and have more poorly crystalline Fe and Al oxides. The greatest potential for sorption maybe at an intermediate soil …
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Mössbauer studies of photsynthetic reaction centers from Rhodopseudomonas sphaeroides R-26
… < 211K) Mossbauer measurements on native (N) and dithionite reduced (R) RCs yield details concerning the electronic state of the iron. At low temperatures and fields the spectra of Nand R differ; the former consists of a sharp quadrupole doublet, while the lines in the latter are magnetically …
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Physical chemistry of microbially-reduced smectites
… spinning nuclear magnetic resonance (MAS NMR) of dithionite- and microbially-reduced montmorillonite revealed that reduction of structural Fe caused reversible structural distortions in the tetrahedral sheet, lifted the paramagnetic effect of Fe(III) on quadrupolar nuclei, and resulted in an …
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Current understanding on cytochrome bd quinol oxidase of Escherichia coli a mutagenesis, kinetics and spectroscopic study
… mutant at Glu445 in subunit I, uncovered the dithionite-resistant ferric heme b595. Electrometrics data further suggested a series of protonatable groups forming a proton channel located in the membrane to facilitate the proton translocation from cytoplasm to the heme b595 / heme d binuclear …
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Characterization of the nifUHD cluster and a new myoglobin-like gene from Nostoc commune UTEX 584
… Treatment of the recombinant protein with dithionite and CO resulted in spectral shifts characteristic of hemoproteins that bind oxygen. While some of the spectral characteristics are unique to the protein, in general the spectra were more like those of globins than cytochromes. Based on …
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