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 202 for “"H-NMR"”.
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¹H-NMR Studies of Sequence and Conformation Using Short RNA Oligomers
… of sequences in the quantities required for NMR spectroscopic experiments and the many in vitro termination assays. The work presented in this thesis was the first to demonstrate that NMR spectral information can be used to sequence RNA oligomers and that sequence and conformation around …
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Theory of the general orientation dependence of ²H NMR spin-lattice relaxation and experiments on model membranes
Deuterium nuclear magnetic resonance (NMR) spin-lattice relaxation was used to explore molecular motions. A general theory of relaxation rates was developed. Motions fast on the NMR timescale were investigated, model-independently, in the acyl chain and headgroup of phospholipids in the liquid …
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Solid/liquid intermolecular transfer of dynamic nuclear polarization - enhanced flowing fluid ¹H NMR signals via immobilized spin labels
… applications such as: 1) observation of enhanced NMR signals without detrimental line broadening due to the presence of stable free radicals in the NMR detection region, and 2) independent optimization of the "EPR" and "NMR" portions of the DNP experiment, are discussed. The thrust of this thesis …
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The use of ¹H-NMR analysis of urine to discriminate between calcium oxalate kidney stone patients and healthy controls
NMR has been used to study the metabolites found in body fluids, like urine, in the past three decades. It has more recently been used to study a lare range of diseases and the toxicolgoical effect of drugs on animals, by looking at metabolite patterns in the urine. The major advanteges of using …
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A method for the rapid, accurate prediction of the physical properties of middle distillate fuels from LC-¹H NMR derived data
… Nuclear Magnetic Resonance Spectrometer (LC-⁻¹H NMR). The physical properties include cetane number, cetane index, density, specific gravity, pour point, flash point, viscosity, filterability, heat of combustion, cloud point, volume percent aromatics, residual carbon content, and initial, 10%, …
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Synthesis and <sup>1</sup>H-NMR characterization of amphiphilic acrylate block copolymers to investigate the effect of chain rigidity on micelle formation in solution
… (<em>T<sub>g</sub>) </em><sup>1</sup>H-NMR methods were developed to measure molecular weight of poly(methyl methacrylate) and poly(t-butyl acrylate) homopolymers to corroborate size-exclusion chromatography measurements. Using qualitative measurements of peak broadening that occurs by …
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Flow and static ¹H, ¹⁹F and ¹⁴N NMR studies in dense fluids
… using MLEV ¹H decoupling in LC/¹⁹F {¹H} NMR was investigated as an alternative to LC/¹H NMR for fluorine containing mixtures and in order to avoid the solvent background problems associated with LC/¹H NMR. P-fluorobenzoate derivatives of various alcohols were analyzed by both LC/¹⁹F {¹H} …
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Flow NMR, analytical applications and theoretical aspects
The use of proton nuclear magnetic resonance (NMR) spectroscopy as an on-line continuous flow detector for liquid chromatography (LC-¹H NMR) is described. Flow inserts for electromagnet and superconducting solenoid magnets are described. Applications to fuel analysis are presented. LC-¹H NMR is …
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High-pressure NMR studies of model membranes and Kramers turnover on solution
… have been investigated by using $\sp{31}$P NMR, $\sp2$H NMR, as well as one and two dimensional $\sp1$H NMR techniques in both the liquid crystalline and various gel phases. The results clearly show that the pressure has an ordering effect on both the headgroup and acyl chain regions. …
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Order and membrane organization in chlorhexidine-lipid mixtures /
… concentrations are investigated using ^H NMR spectroscopy on a chain-deuterated lipid analog. Lipid-chlorhexidine formulation is known to release the drug into an aqueous medium slowly, maintaining a comparable concentration of the drug for up to four times longer than a direct aqueous …
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Polymer dynamics in bulk, adsorbed and solution by NMR methods
… with deuterium nuclear magnetic resonance (²H NMR) study of bulk and adsorbed polymers. Segmental dynamics of poly(methyl acrylate) is examined in bulk and when adsorbed to anopore, alumina and silica as a function of temperature. The second part investigates diffusion of small molecules in …
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Binding study of nickel complex to protein by equilibrium dialysis
… was proven by electrospray mass spectroscopy, H-NMR, and elemental analysis. The H-NMR data also demonstrated that this complex has two vacant coordination sites in the distorted octahedral form in aqueous solution.</p> <p>Histone and bovine serum albumin which are typical proteins in eukaryote …
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A spectroscopic study of square planar platinum (2) complexes
… techniques consisting of ultraviolet, ¹H-NMR and mass spectrometry have been used in the structural analysis of square planar Pt(II) complexes. The complexes trans-[PtBr₂(Y) (R-an)] (Y = C₂H₄,CO; R-an = substituted aniline) were prepared and investigated by the spectrosopic techniques. …
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Synthesis and Reactivity of Dichalcogenide and Substituted Dichalcogenide Ligands in Molecular and Nonmolecular Compounds
… prepared. The reactivity and distinctive ('1)H NMR spectroscopic behavior of complexes containing these ligands have been examined. The reactivity studies were extended to solid-state metal sulfides, particularly pyrite (FeS(,2)).
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Analysis of dirhenium carboxylate : purine dinucleotide adducts
… and analyzed. LC/MS, HPLC, <sup>1</sup>H NMR, and UV-Visible spectroscopy were used to characterized complexes of Re<sub>2</sub>(O<sub>2</sub>CR)<sub>2</sub>X<sub>4</sub>·2H<sub>2</sub>O (R = CH<sub>3</sub>, CH<sub>2</sub>CH<sub>3</sub>; X= Cl, Br) with the purine dinucleotides dApG and …
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Hydrogen bonding as it relates to miscibility of high performance poly(arylene ether)s with epoxy resins
… oxide) and water was undertaken. ¹H NMR spectroscopy of model compounds in DMSO-d₆/ water (97/3) solutions was performed to ascertain the effect of the mole fraction of model compound in solution on the shift of the water peak in the ¹H NMR spectrum. In all cases, increasing mole …
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