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Showing 1 to 20 of 43 for “"NMR relaxation"”.
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Solid State NMR Relaxation Studies of Triosephosphate Isomerase
… essential to understanding biological function. NMR is a powerful technique for the observation of protein dynamics in that dynamics can be observed site-specifically over a wide range of timescales from picoseconds to seconds. Spin relaxation measurements, including relaxation in the rotating …
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Oxygen-17 NMR relaxation studies of oxide superconductors
Made available in DSpace on 2011-05-07T13:27:19Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9114384.pdf: 5825835 bytes, checksum: 036bdff1b74ac47d8a688000ba67034b (MD5) Previous issue date: 1990
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NMR relaxation studies of liquids in confined geometries
Nuclear magnetic resonance (NMR) relaxation has been used for the study of confined geometry effects on the translational and rotational dynamics of molecular liquids in sol-gel prepared porous silica glasses. The NMR relaxation times of a variety of nuclei, including $\sp1$H, $\sp2$H, $\sp{14}$N, …
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Deuterium NMR relaxation studies of liquids in confined geometries
Nuclear magnetic resonance (NMR) has been employed to study the confined geometry effects on reorientational dynamics of molecular liquids in porous media. The relative role of the pure geometrical confinement and the strength of the surface effect is investigated. The deuteron NMR spin-lattice …
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Sodium NMR relaxation parameters in cartilage : implications for MR imaging
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1995.
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Carbon-13 NMR Relaxation Study of Motional Dynamics in Complex Liquids
… compounds has been investigated using $\sp{13}$C NMR relaxation measurements. Natural abundance $\sp{13}$C NMR spin-lattice relaxation times (T$\sb1),$ spin-spin relaxation times (T$\sb2),$ and nuclear Overhauser effects of individual carbon nuclei in the complex phthalate liquids were measured as …
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Applying NMR Relaxation Methods to the Study of Liquids in Porous Media
… this thesis focusses on the development of NMR relaxation techniques to unambiguously characterise the adsorption behaviour of liquids imbibed within catalytic materials. Principally, this study is centred on γ-alumina, which is used industrially as both a catalyst and a catalyst support. …
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The Use of Driven Equilibrium Conditions in the Measurement of NMR Relaxation Times
The further development of the use of NMR relaxation times in chemical, biological and medical research has perhaps been curtailed by the length of time these measurements often take. The DESPOT (Driven Equilibrium Single Pulse Observation of T1) method has been developed, which reduces the time …
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Konformation und Wechselwirkung von Elastomeren, adsorbiert an Ruß und Silica - untersucht durch transversale 1H NMR Relaxation
Mit Hilfe der transversalen 1H NMR Spektroskopie wurde die Konformation von adsorbierten Polymeren und die Stärke der Füllstoff-Polymer Wechselwirkungen bestimmt, und Rückschlüsse auf die verstärkenden Eigenschaften des Füllstoffs gezogen. Als Füllstoffe dienten vier Ruße mit bekannten, stark …
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Determination of Chemical Activity of Soybean Proteins and Amino Acid Model Systems From NMR Relaxation Data in Relation to Water Sorption Isotherms
Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1994.
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Molecular structure, dynamics and hydration studies of soybean storage proteins and model systems by nuclear magnetic resonance
The potential of high-resolution $\sp{13}$C NMR for the characterization of soybean storage proteins was explored. The spectra of a commercial soy protein isolate as well as those of alkali-denatured 7S and 11S soybean globulins were well resolved and tentatively assigned. Relaxation measurements …
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Nuclear magnetic resonance studies of corn zeins and other byproducts of corn wet milling: Dynamic and structural basis of functionality
"Nuclear Magnetic Resonance (NMR) relaxation and spectroscopy techniques were used to evaluate the hydration properties and mobility of ""bound"" water in corn zein solutions and samples of corn gluten meal (CGM) and corn germ meal (CGRM). Multinuclear relaxation measurements using $\sp1$H, $\sp2$H …
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A multi-technique approach to characterise acidic surface properties of microporous catalysts
… use of non-invasive nuclear magnetic resonance (NMR) techniques to characterise surface acidity in zeolites by benchmarking the NMR results to various more established zeolite characterisation techniques, such as Fourier transform infrared (FTIR) spectroscopy and temperature-programmed desorption …
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Theoretical Studies of the Solvation, Dynamics, and Photochemistry of Ethylene, Retinal Protonated Schiff Base, Oligocellulose, and Gd(III) Clusters
… of cellulose oligomers have been studied by 13C NMR relaxation techniques and compared to molecular dynamics (MD) simulations. We found evidence of anisotropic motion across the series, with experimentally determined order parameters (S 2) ranging from 0.30 to 0.52 and computationally determined …
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Applying Solid-state NMR Methods to the Study of Organic Shale Rocks
… materials, making traditional low-field 1H NMR relaxation methods difficult to apply. The mobilities of the different hydrocarbon components can differ dramatically, from producible methane to the solid kerogen (the biopolymer precursor to petroleum). These considerations imply a “paradigm …
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Biopsy-implantable chemical sensor
… consists of a small nuclear magnetic resonance (NMR) probe that has a cavity filled with a contrast agent sensitive to the chemical of interest. An NMR relaxation measurement of the contrast agent reveals the chemical concentration. Wireless NMR measurements are performed with the aid of a reader …
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Structure Property Relationships of Proton Exchange Membranes
… the copolymers were characterized using DSC and NMR relaxation techniques. At similar ionic contents, the free water concentration increased with increasing block lengths. The distribution of the states of water in the copolymers correlates to transport properties. This knowledge, coupled with …
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Quantitative lactate-specific magnetic resonance imaging and proton spectroscopy of muscle and brain
… concentration, which change the apparent NMR relaxation times T$\sb1$ and T$\sb2$ of water around the area of activation.
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Magnetic resonance studies of chemical reactions in microemulsions
… In this project, nuclear magnetic resonance (NMR) spectroscopy and imaging (MRI) techniques were used along with existing optical methods in order to identify redox indicators suitable for the visualisation of pattern formation in the BZ-AOT reaction using MRI. The location of the redox …
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