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Showing 1 to 20 of 49 for “"Kinetic measurements"”.
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Steric and kinetic measurements at well-defined surface sites
… This allows for study of ligand exchange kinetics without the convoluting factors of surface migration or co-dissociation of surface metal atoms. The appendix contains two chapters with applications of carbon functionalization and a chapter on protection of 1,2-diamines. The first chapter …
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Millisecond and Submillisecond Folding Kinetics of Horse Apomyoglobin and Yeast Phosphoglycerate Kinase
… generally devoid of stable secondary structure. Kinetic measurements indicated the molecule collapses to a molten globule type state on the sub-ms time scale. Measurements on the wild-type protein and a series of single tryptophans mutants also showed vastly different folding times indicating …
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Cytochrome AA(3) From Rhodobacter Sphaeroides: Affinity Purification and Biophysical Characterization of Site-Directed Mutants
… visible and vibrational spectroscopy to rapid kinetic measurements of electron and proton transfers were used to probe the various effects of these mutants on the structure and function of the enzyme. Results were interpreted, when possible, in terms of possible redox-linked proton pumping …
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Cytochrome AA(3) from Rhodobacter sphaeroides: Affinity purification and biophysical characterization of site-directed mutants
… visible and vibrational spectroscopy to rapid kinetic measurements of electron and proton transfers were used to probe the various effects of these mutants on the structure and function of the enzyme. Results were interpreted, when possible, in terms of possible redox-linked proton pumping …
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Semiconducting properties of the passive films on copper
… through capacitance, photoresponse and kinetic measurements. Mott-Schottky plots show that the passive films on copper are p-type semiconductors. The metal deficits form the electron acceptors, which give rise to p-type conductivity. The passive films show photovoltages under …
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Exploring the Mechanistic Landscape of Nitric Oxide Oxidation and Ammonia Selective Catalytic Reduction of Nitric Oxide on Cu-Zeolites via Kinetic and Spectroscopic Characterization
… and x-ray absorption (XAS) spectroscopies, kinetic measurements and density functional theory (DFT) calculations forms the basis for this dissertation.
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Kinetic studies of ethane dehydrogenation using carbon dioxide as mild oxidant over gallium aluminum mixed oxide
… Ga/Al ratio of 0.1 and conducted a series of kinetic measurements on different surface Ga loadings. The kinetic parameters are found to be sensitive to the surface composition. The reaction order on ethane is close to 1 for gamma- Al2O3 and surface Ga/Al ratios lower than 0.1, while it is …
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Construction and Application of Reference Scales for the Characterization of Cationic Electrophiles and Neutral Nucleophiles
… parameters (E) of new compounds by kinetic measurements. This was shown by adding various new classes of nucleophiles like enamines, phosphanes and phosphites, and pyridines as well as by adding new electrophiles. Kinetic data for electrophile-nucleophile combinations were used for …
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The characterization of silica-based sorbents in reversed phase liquid chromatography with application to method development in solid-phase extraction
… a systematic approach to method development, the kinetic and retention properties of four popular siloxane-bonded SPE sorbents have been determined. Kinetic measurements allow the evaluation of the performance of extraction devices and reveal areas in which small changes in design or manufacture …
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Development Of Kinase Catalyzed Biotinylation To Study Phosphoproteomics
… tag. To explore kinase-catalyzed biotinylation, kinetic measurements were obtained with various kinases and the data indicated that kinase-catalyzed biotinylation occurs with catalytic efficiency appropriate for phosphoproteomics application. Next, the susceptibility of the biotin tag to …
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Acoustically-levitated drop reactor (ldr) employable for kinetics measurements of biochemical networks
Accurate measurement of enzyme kinetics is an essential part of understanding the mechanisms of biochemical reactions. The typical means of studying such systems use stirred cuvettes, stopped-flow apparatus, microfluidic systems, or other small sample containers. These reaction-kinetics …
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Biochemical Characterization of Thermocrispum agreste TheA: A Flavin-Dependent N-hydroxylating Enzyme
… enzyme mechanism was studied using steady state kinetic measurements, thermostability, and stopped flow spectrophotometry assays. Using these techniques, the catalytic rates, substrate binding affinities, thermal stability, and coenzyme specificities were determined. Additionally, NADPH analogues …
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New chalcogenide-based phase-change materials for potential data storage applications
… and silicon substrates, K2Bi8S13was shown by kinetic measurements to have the potential to switch faster than existing materials.These compounds were characterized by thermal and optical analysis (DTA, DSC,UV-Vis), X-ray diraction (XRPD, PDF), and electron microscopy (TEM, SEM).
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Characterization of Pressure-Driven and Electro-Kinetically Driven Flow in a Micro-Fluidic Chip Using Particle Imaging Velocimetry
… flow profiles of pressure-driven and electro-kinetic driven flows were compared for a microfluidic chip. It was found that the pressure-driven flow had a parabolic profile while the electro-kinetic flow had a plug shaped flow profile. The measured velocities were similar to those determined by …
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Niobium-mediated generation of P-P multiply bonded intermediates
… in higher yields than for the uncomplexed P2. Kinetic measurements on the elimination reactions showed them to be first-order in diphosphaazide complex and independent of substrate concentration, consistent with the hypothesis that P2 and (P2)W(CO)5 are released into solution as discrete …
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Surface-Enhanced Spectroelectrochemistry using Synchrotron Infrared Radiation
… cell design. Furthermore, dynamic measurements are fundamentally limited by the finite rise time of the electrode. For many important processes with characteristic timescales in the milli- to microsecond regime, achieving a suitably low rise time requires the use of an electrode …
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Synthesis and Characterization of Novel Adsorbent Fibers
… through pressure drop, capacity and dynamic mode kinetic measurements. Total ion exchange capacities up to 19.5 meq/g were measured for the fibers with pressure drops less than half that of beads over a wide range of flow rates. The second system utilizes the activated carbon fiber as a template …
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Trends in C-H bond dehydrogenation energetics for small molecule conversion
… Optimal catalysts are identified by a series of measurements, and in most cases the underlying reaction mechanism is not well understood leading to difficulty in designing future catalysts. Systematic studies have to be carried out in order to investigate the catalyst surface under reaction …
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Structure-Sensitivity of CO Oxidation Over Supported Pt Catalysts in the Subnanometer Regime and Its Origin
… density functional theory calculations and microkinetic modeling with kinetic measurements, in situ/operando infrared and X-ray absorption spectroscopies, we show that single-atom Pt/anatase TiO2 follows a complex reaction pathway consisting of initiation steps to re-organize the active site and …
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Kinetics and regulation of the initial stages of cadherin-mediated adhesion
… may play a critical role in cadherin kinetics. This dissertation looks at kinetic measurements of cadherin binding which are done in the context of the cell membrane, and quantifies the affinity of the tryptophan strand exchange for three classical cadherins. Both the interactions …
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