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 35 for “"UV spectroscopy"”.
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Copper Complexes Which Catalyze the Air Oxidation of Organic Substrates.
… and optical [visible (vis) and ultraviolet (uv)) spectroscopy are often the techniques of choice for studying the reaction. They require a knowledge of pmr and optical spectral parameters. The studies in Part I were carried out to obtain the spectral parameters for future studies.
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SALT spectropolarimetry commissioning
… visible arm spanning 320-900 nm, employs a high UV-transmitting optical design to support UV spectroscopy down to the atmospheric cutoff at 320nm (rare on large telescopes).
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Fundamental studies of thionocarbamate interactions with sulfide minerals
… tests, contact angle measurements, FTIR, and UV spectroscopy. Pearson’s theory of hard and soft acids and bases (HSAB) has also been applied to these flotation systems, through the use of Drago’s acid-base concept and flow microcalorimetry. The results of the thermodynamic calculations and …
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Size Exclusion Chromatography of Poly(2-ethyl-2-oxazoline) Homopolymers and Poly(ethylene oxide)-b-Poly(2-ethyl-2-oxazoline) Copolymers
… scattering, viscometry, refractive index and UV spectroscopy to analyze block and graft copolymers as well as polymers with oligomeric molecular weights. Oligomeric molecular weights present special challenges since the light scattering and viscosity detectors are more sensitive to higher …
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Facile protein and amino acid substitution reactions and their characterization using thermal, mechanical and optical techniques
… substituted products were analyzed using Raman spectroscopy and UV-spectroscopy based ninhydrin assay. In case of alanine, Raman and UV results correlated with each other. With cysteine at lower EVS substitutions amine on the main chain was the preferred site while the substitution shifted to …
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Synthesis and Characterisation of Photoresponsive Azobenzene-Biomolecule Conjugates
… by a variety of techniques including NMR spectroscopy, IR and UV/Vis spectroscopy, as well as HRMS. The structures of some compounds have been determined by x-ray crystal analysis. The photophysical properties of a selected range of bioconjugates has been explored: the photostationary …
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Ion containing copolymers via the emulsion copolymerization of polar and ionic vinyl monomers
… Analysis of the copolymer composition by UV spectroscopy, and potentionmetric titration was not possible due to the vastly different solubility characteristics of the components of this system. This prevented the use of homopolymer blends as standards for these techniques. The study of the …
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G-wires: The growth and characterization of a G4-DNA nanostructure
… employed the techniques of gel electrophoresis, UV spectroscopy and atomic force microscopy (AFM) to study a new G4-DNA nanostructure. The oligonucleotide d(GGGGTTGGGG) (Tet1.5) self-assembles into highly ordered filamentous polymers that we call G-wires. The self-assembly of Tet1.5 into G-wires …
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Development of novel photocatalysts for solar hydrogen production
… material was characterised using XRD, SEM, IR spectroscopy, Raman spectroscopy and magnetic susceptibility measurements. Materials annealed above 600 °C were found to consist mainly of FeVO4, although traces of hematite were found. Diffuse-reflectance UV spectroscopy and subsequent Tauc plots …
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Novel strategies for optimising drug release from medicinal implants
… at various time points up to 28 days, using UV-spectroscopy. In this project we found that there may be a relationship between the coating method chosen, the characteristics of the surface and the drug release profile generated. By varying the parameters of the coating process, it should be …
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Interactions of platinum compounds with heterocyclic bases.
… in concentration of platinum or ligand by AA or UV spectroscopy respectively. It was found that the rate of reaction is second order, the rate being dependent on the concentration of both platinum complex and the ligand. The substitution of ligand takes place by direct replacement, involving an …
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Aspects of radiation curing
… of dialkyltin diacrylates, as well as the UV and electron beam induced polymerisation of some novel silicon containing acrylates are discussed. The reactivity and film forming properties of these materials are compared with that of some commercial diluents such as, tripropyleneglycol …
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Developing polypyrrole coated coronary stents for extended release of Sirolimus
… days, and sirolimus release was analysed using UV spectroscopy. It was found that there is a direct relationship between the concentration of the drug used in the coating solution and the drug release profile. Therefore by varying the concentration of sirolimus, an optimal drug release profile …
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Spectroscopic Studies of Some Semiquinone Radical Ions
Previous ESR and UV spectroscopic studies of semiquinone cations are reviewed. Cations of 4,4'-bipheno-semiquinones prepared by chemical oxidation of the corresponding diols and reduction of the quinones in sulphuric acid, were studied using ESR and UV spectroscopy. Oxidation of biphenyl-4,4'-diol …
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The modification of polymeric materials with plasticizers or elastomers
… of the PB has been developed using ¹³C nmr and UV spectroscopy. Solution blends of PVC with PB modified with up to 11 mol% IAD were found to be immiscible. Stress-strain testing suggested that IAD modification (11%) enhanced the apparent compatibility between PB and PVC at 25% rubber content. …
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Non-canonical sensing mechanisms in bacteria
… the sensing domain of HemAT was analyzed using UV spectroscopy. UV spectroscopy suggests that alcohols do not directly bind or interact with the heme group within the HemAT sensor domain. However, Isothermal Titration Calorimetry analysis demonstrated that the cytoplasmic signaling regions of …
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Observational studies of highly evolved cataclysmic variables
… between these two theories, I present UV spectroscopy and find a metallicity consistent with halo origin. Systems close to the minimum period are expected to be faint and have low accretion rates. Some of these CVs show absorption in their spectra, implying that the underlying WD is …
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Evaluation and testing of a novel photocatalytic reactor with model water pollutants.
… as photocatalyst in an aqueous suspension under UV irradiation. Experiments were conducted to investigate the effects of parameters such as catalyst loading, pollutant adsorption rate on the pellet TiO2 catalyst and reactor circulation flow rate. In this work, the batch adsorption of methylene …
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Development of SiRNA Incorporated Surface Modified Polymeric Nanoparticle for the Potential Treatment of Global Cerebral Ischemia
… achieved via PEGylation was established using UV spectroscopy. Furthermore, in vitro tests revealed that lower concentrations of nanoparticles have less toxicity to N2A cells than higher concentrations of blank nanoparticles. Higher permeability of PEG+PS-80 coated nanoparticles was observed, …
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Bioactive surfaces for improved coronary stent performance
… release of salicylate monitored over time using UV-spectroscopy. Both polymerisation methods released a similar total mass of drug (~12 µg), with the release period ranging from 1 day for potentiostatic coatings to 3 days for galvanostatic coatings. Thirdly, the biocompatibility of the coatings …
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