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 74 for “"UV/Visible Spectroscopy"”.
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Studies of Stratospheric and Tropospheric Ozone, NO2, and BrO Using UV-Visible Spectroscopy in the Arctic and at Mid-latitudes
This thesis utilizes UV-visible spectroscopy to develop new datasets, study Arctic and urban atmospheric composition, and validate satellite data products. The primary instruments used here (the Ground-Based Spectrometers, or GBSs) have been taking measurements at the Polar Environment Atmospheric …
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I. Direct observation of o-xylylene (o-quinodimethane) in solution, Dimerization kinetics of some o-quinodimethanes; II. Kinetic and product studies on the dimerization of [alpha]-methyl-substituted o-quinodimethanes; III. Direct observation of 1,2-napthoquinodimethane and 9,10-phenanthroquinodimethane, Dimerization kinetics of resonance-stabilized o-quinodimethanes
… (1) was observed directly in solution by UV-visible spectroscopy. Using stopped-flow UV-visible spectroscopy it was determined that the dimerization of 1 follows second-order kinetics with a rate constant of 9.94 (+OR-) 0.32 x 10('3) L mol('-1) sec('-1) at 25(DEGREES)C in CH(,3)CN. Two …
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Thermodynamic properties of diamino-diamide ligand as potential anti-inflammatory agent
… using glass electrode potentiometry, UV/Visible spectroscopy, nuclear magnetic resonance spectroscopy, speciation modelling as well as blood plasma modelling.
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Design and construction of a Helmholtz coil apparatus for nanoparticle heating
… monitor the effectiveness of this heating with UV/Visible spectroscopy. However, fluorescence spectroscopy would provide a more sensitive and versatile way to monitor the effects of magnetic heating. By using a Helmholtz coil pair, I have successfully created a coil set-up that can manipulate a …
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Synthesis of novel pendant arm macrocyclic ligands as potential models for enterobactin
… were characterized by electronic absorption spectroscopy. The second series of ligands described are based on the pendant arm macrocyclic ligand, 1, 4, 7-triaminoethyl-1, 4, 7- triazacyclononane. New routes to the preparation of this ligand were investigated; the best approach used …
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In Vitro Selection and Characterization of Transition Metal -Dependent DNAzymes and RNAzymes
… the electronic properties of Co2+, we have used UV-Visible spectroscopy to obtain a better understanding of the metal binding properties of the selected DNAzyme systems. Through analysis of the spectroscopic and metal binding properties of these systems, in conjunction with the activity …
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Inhibition of Cysteine Protease by Platinum (II) Diamine Complexes
… The activity of papain enzyme was measured on UV-Visible spectroscopy. The inhibition profile of papain with different platinum (II) complexes, and with different combinations was studied.</p>
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Exploitation of synergy in oxidation catalysis with bimetallic aluminophosphate catalysts
… powder X-ray diffraction, diffuse reflectance UV/Visible spectroscopy, cyclic voltammetry, extended X-ray absorption fine structure, X-ray absorption near edge spectra, scanning electron microscopy and surface/elemental (BET and ICP) methods. A significant change was observed when two metals …
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Electrochemical and Spectroelectrochemical Studies of Complexes with Multiple Redox Centers
… electrochemical technique along with thin-layer UV-visible and FTIR spectroelectrochemistry. The primary focus of this work was to elucidate the overall redox behavior of the compounds and to examine the site of electron transfer. Ligand binding reactions were also monitored by UV-visible …
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Mechanistic studies of the class I ribonucleotide reductases from S. cerevisiae and E. coli.
… I E. coli RNR is investigated using stopped-flow UV-visible spectroscopy and rapid chemical quench methods. These studies have led to a model in which the rate determining step in catalysis is a physical step prior to proton-coupled electron transfer (PCET), nucleotide reduction, and reverse PCET. …
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SYNTHESIS OF NANOCOMPOSITES BY LASER ABLATION
… resulting bio-nanoconjugates were examined with UV-Visible spectroscopy (UV-Vis), dynamic light scattering (DLS), and transmission electron microscopy (TEM). These techniques showed that the Au nanoparticles in aqueous solutions were highly monodispersed spherical particles with a very narrow …
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Tailoring Local Conductivity by the Formation of Ag Nanoclusters in SiO2 Xerogel Films
… were formed within the pores of these films by UV exposure. Nanoparticle formation was confirmed by UV-visible spectroscopy and Transmission Electron Microscopy (TEM). Conductive Atomic Force Microscopy (CAFM) showed that the conductivity of the films decreased upon exposure to UV. This decrease …
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Detection of trace concentrations of small and big molecules through vibrational spectroscopy
… of varying sizes using surface-enhanced Raman spectroscopy (SERS) without the need for customizing the morphology of nanostructured substrate. Signal enhancement in SERS occurs near plasmonic nanoparticles within "hotspots" (<10 nm), which limits detection to molecules that can access these …
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First steps toward the construction of a channel cell for electrochemical studies under hydrothermal conditions
… and pressures was also investigated using UV-visible spectroscopy up to 250 ˚C at 70 bar. These studies confirmed H2Q is stable in hot compressed water (pH ~ 2) up to at least 250 ˚C at 70 bar, but BQ, the oxidation production of H2Q, decomposes at temperatures lower than 100 ˚C with the …
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Observation by flow 1H NMR and dimerization kinetics and products of reactive ortho-quinodimethanes and benzocyclobutadiene
… (1) were observed by flow [superscript]1H NMR spectroscopy at room temperature. The [superscript]1H NMR spectrum of 9, generated in acetonitrile-d[subscript]3 (CD[subscript]3CN) by fluoride ion induced 1,4-elimination from (1-(trimethylsilylmethyl)) trimethyl(2-naphthylmethyl)ammonium iodide …
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Synthesis and growth dynamics study of silver nanoparticles
… of seeds. The products were characterized by UV-visible spectroscopy and transmission electron microscopy (TEM). This work was followed by a profound dig-out, to try and comprehend the mechanism for reduction and the kinetics of the reduction of silver nitrate to silver nanoparticles. It was …
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Development of a synthetic enzyme for detection and quantitation of Thiols
… yielded unique species based on RP-HPLC, and UV-Visible spectroscopy. After isolation by RP-HPLC, synzymes were examined for thiol oxidation under pseudo-first order conditions, and thiol oxidation rates were determined. Only the secondary ferrocene-$\beta$-cyclodextrin product gave enhanced …
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Coaxial Electrospinning of Synthetic/Natural Polymer Combinations for Controlled Release of Active Components in Biomedical Applications
… microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR), UV-visible spectroscopy, and transmission electron microscopy (TEM), are employed to analyse fibre morphology, chemical composition, and structural properties. Specifically, polycaprolactone (PCL) as a shell layer demonstrates …
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Design of novel copper(II) based anti-inflammatory drugs for the elevation associated with Rheumatoid Arthritis
… glass electrode potentiometry, infrared (lR) spectroscopy, nuclear magnetic resonance (NMR) spectroscopy, UV/Visible spectroscopy as well as blood plasma modelling were used to explore the coordination chemistry of a newly designed ligand, PCUL (Bis-(3- aminoethy-2-aminomethylpyridine …
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Drug Discovery in Redox Biology: From Natural Products to Structural Biology
… was purified and crystallized. SDS-PAGE and UV–Visible spectroscopy confirmed protein purity and FAD incorporation. Crystals obtained via hanging-drop vapor diffusion diffracted to ~4.0 Å at the Advanced Photon Source, enabling visualization of the enzyme’s overall fold and catalytic redox …
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