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 347 for “"Magnetic resonance spectroscopy"”.
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Nuclear magnetic resonance spectroscopy and ultrasound
… These changes can then be detected by nuclear magnetic resonance (NMR) in spin-lattice and spin-spin relaxation times. The objective being to develop a method capable of reducing the pulsed NMR acquisition times of slowly relaxing nuclei. The thesis describes the theoretical principles …
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Tissue oxymetry using magnetic resonance spectroscopy
… By using paramagnetism of molecular oxygen, magnetic resonance spectroscopy (MRS) can be used to measure tissue oxygenation. Chemical shifts of brain metabolites and water have a downfield shift with increased amounts of oxygen. Chemical shifts were linearly dependent on the fraction of …
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Detection of brain metabolites in magnetic resonance spectroscopy
While magnetic resonance imaging (MRI) derives its signal from protons in water, additional and potentially important biochemical compounds are detectable in vivo within the proton spectrum. The detection and mapping of these much weaker signals is known as magnetic resonance spectroscopy or …
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Absolute tumor perfusion determined by nuclear magnetic resonance spectroscopy :
The ultimate goal of this dissertation is to describe the optimization and implementation of an NMR indicator uptake technique which can non-invasively and repeatedly measure tissue perfusion. Chapter II concerns itself with the method optimization of the NMR approaches to measuring tissue …
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Magnetic Resonance Spectroscopy Correlates of Outcome in Nonaccidental Trauma
… sequelae in this population. Proton Magnetic Resonance Spectroscopy (<sup>1</sup>H-MRS) provides a promising, quantitative technique by which biochemical substrate levels that result from head injury may predict long term neuropsychological sequelae.</p> <p>The purpose of this study …
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Radio frequency gradient high resolutions nuclear magnetic resonance spectroscopy
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 1996.
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Multinuclear Solid-State Nuclear Magnetic Resonance Spectroscopy of Microporous Materials
… other techniques such as solid-state NMR (SSNMR) spectroscopy. This thesis is focused on the study of two types of microporous materials, metal–organic frameworks (MOFs) and titanosilicates, by multinuclear SSNMR spectroscopy in combination with quantum chemical calculations for computational …
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Solid-State Nuclear Magnetic Resonance Spectroscopy of Alpha-Synuclein Fibrils
Recent solid-state NMR (SSNMR) studies on protein systems such as beta-amyloid and the prion HET-s demonstrate the applicability of these techniques towards solving 3D structures of amyloid fibrils. Alpha-synuclein is a 140-residue protein that has been implicated in Parkinson's disease. Fibrils of …
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An evaluation of Hahnemannian quinquagenimillesimal potencies using nuclear magnetic resonance spectroscopy
Dissertation submitted in partial compliance with the requirements for the Master's Degree in Technology: Homoeopathy, Technikon Natal, Durban, South Africa, 1997.
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Structural studies of the pleckstrin protein by nuclear magnetic resonance spectroscopy
Das Pleckstrinprotein ist das Hauptsubstrat von Protein Kinase C (PKC) in Blutplättchenzellen. Die Phosphorylierung Pleckstrins setzt Prozesse in Gang, die zur Aktivierung des Blutplättchens, Blutgerinnung und Wundverschluss führen. Pleckstrin besteht aus drei Domänen: den prototypischen pleckstrin …
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Magnetic resonance spectroscopy: techniques and applications in thermometry and metabolite mapping
Magnetic Resonance Spectroscopy (MRS) is a useful tool for obtaining information about metabolite concentrations. Information that can be extrapolated from these concentrations may be absolute or relative in nature, depending on the availability of an internal reference. For example, MR Thermometry …
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Phosphorus-31 nuclear magnetic resonance spectroscopy of human uterus and placenta
… aims to demonstrate the usefulness of Nuclear Magnetic Resonance Spectroscopy in understanding normal human placental and uterine metabolism as well as its application in the study of gestational and gynecological disorders. We have used phosphorus-31 NMR spectroscopy on isolated samples of …
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Molecular and spin dynamics in solid state nuclear magnetic resonance spectroscopy
Nuclear Magnetic Resonance (NMR) spectroscopic data often involve spatial and spin dynamics and interference phenomena between the two. Experimental results are presented which demonstrate several of these phenomena and exploitation of these anomalies to acquire and improve knowledge regarding …
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Structure and dynamics studies by solid-state nuclear magnetic resonance spectroscopy
… a review of recent progress in solid state NMR spectroscopy. The importance of directly observing ions in biological systems is discussed, and the advantages of 205T1 spectroscopy are noted of. Theoretical framework of the NMR experiments is described in chapter 2. The third chapter presents the …
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Dipolar recoupling and decoupling in solid state nuclear magnetic resonance spectroscopy
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 1995.
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Dynamic 129Xe Magnetic Resonance Spectroscopy: Development and Application in Diverse Cardiopulmonary Diseases
… </p><p>Hyperpolarized 129Xe MR imaging (MRI) and spectroscopy (MRS) have emerged as a powerful tool for assessing the pulmonary environment due xenon exhibiting distinct chemical shifts as it diffuses from the airspaces, through the alveolar membrane, and interacts with red blood cells (RBCs). …
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The characterization of starches and maltodextrins by proton nuclear magnetic resonance spectroscopy
… in $\alpha$-glucans using proton nuclear magnetic resonance (NMR) has been developed. Instrument parameters and sample conditions were investigated for their effect on determining the $\alpha$-(1,4)/$\alpha$-(1,6) linkage ratios of starches. Two methods were developed using 0.6 N potassium …
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Advancement of 31P Magnetic Resonance Spectroscopy Using GRAPPA Reconstruction on a 3D Volume
… of 31P metabolites in the liver, obtained by Magnetic Resonance Spectroscopic Imaging (MRSI) [1,2], can help in diagnosis and follow-up of various liver diseases. Specifically, there appears to be an immediate need of this technology for both the assessment of tumor response in patients with …
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Studies of organophosphorus compounds by nuclear magnetic resonance spectroscopy with two frequency dimensions
… has been prepared and studied by n.m.r. spectroscopy.
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