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 679 for “"13C"”.
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In-situ 13C CM-MAS NMR study of dilute acid biomass pretreatment on 13C enriched poplar wood
In situ 13C NMR measurements are reported on 13C-enriched powdered poplar wood that is subjected to pretreatment with water and 0.5 M sulfuric acid as a function of time at 150 °C. 13C MAS (magic-angle spinning) spectra were obtained in both the CP (cross polarization) and DP (direct polarization) …
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Enriquecimento e alocação de 13C em plantas de eucalipto
… MOS usando a variação da abundância natural do 13C, requerem mudanças na razão isotópica do C. Uma das alternativas é enriquecer o material vegetal (planta) com 13C, via fixação de 13CO2, de modo que a razão isotópica seja distinta daquela da MOS original. O objetivo deste trabalho foi …
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Technical Development of Hyperpolarized [1-13C]Pyruvate Imaging for Clinical Translation
Magnetic resonance imaging with hyperpolarized [1-13C]pyruvate is an emerging tool for assessing in vivo metabolism noninvasively. Over the past few years since the first clinical study with prostate cancer patients, translational studies using this imaging technique have been focused on …
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Mathematical approaches for the clinical translation of hyperpolarised 13C imaging in oncology
… which enables the metabolism of hyperpolarised 13C-labelled molecules to be dynamically and non- invasively imaged in tissue. The first molecule to gain clinical approval is [1-13C]pyruvate, the conversion of which to [1-13C]lactate has been shown to detect early treatment re- sponse in cancers …
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In vivo 13C stable isotope tracing of single leaf development in the cold
… data. In order to allow the feeding of a 13C sucrose solution into the plant, a petiole and a hypocotyl feeding assay are developed. To enable the processing of large numbers of single leaf samples, their preparation and extraction are simplified and optimised. The metabolite profiles of …
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Aspects of Wood Adhesion: Applications of 13C CP/MAS NMR and Fracture Testing
… swelling studies) and measurements made using 13C CP/MAS NMR. These correlations were then utilized to characterize PF cured in the presence of wood. The use of 13C labeled PF allowed estimates of relative degrees of resin conversion to be made. The use of 13C and deuterium labeled PF allowed …
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Organocatalytic synthesis of chiral non-racemic aziridines, labelled with 2H, 15N, 13C stable isotopes
… labelled with stable isotopes: 2H, 13C and 15N. The reactions were catalysed by (S)-BINOL derived N-triflylphosphoramide Brønsted acid and stable isotopes were selectively introduced within an aziridine ring with > 95% isotopic enrichment. The desired compounds were generated in …
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Development of pulse sequences for hyperpolarized 13C magnetic resonance spectroscopic imaging of tumour metabolism
Metabolic imaging with hyperpolarized 13C-labeled cell substrates is a promising technique for imaging tissue metabolism in vivo. However, the transient nature of the hyperpolarization - and its depletion following excitation - limits the imaging time and the number of excitation pulses that can be …
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13C-nuclear-magnetic-resonance of carbon monoxide on platinum: Study of a highly dispersed catalyst
The 13C Nuclear Magnetic Resonance lines, spin-lattice relaxation times Tl and spin-spin relaxation times T2 of CO chemisorbed on the surface layer of small particles of Pt metal have been observed by the method of spin echoes as a function of magnetic field, temperature, CO coverage and Pt …
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In situ High Pressure and Temperature 13C NMR for the Study of Carbonation Reactions of CO2
… using a novel, elevated pressure and temperature 13C NMR probe. Critical observations about reaction rates, chemical exchange, and pH measurements throughout these reactions and the implications of the in situ measurements made during these reactions are discussed. A new method is used to …
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Method Development of 13C, 1H and 31P Magnetic Resonance Spectroscopy for use in Traumatic Brain Injury
… support further investigations into TBI. Dynamic 13C MRS is unique in its ability to directly measure in vivo rates of cerebral metabolism non-invasively. In this thesis the 13C-labelled substrate [2-13C]glucose was used for infusion due to its reduced technical demands. To date [2-13C]glucose …
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The 1H and 13C dynamic nuclear polarization (DNP) enhancement for novel silica phase immobilized nitroxide (SPIN) samples
The solid/liquid intermolecular transfer (SLIT) flow dynamic nuclear polarization (DNP) experiment potentially provides new methodology for studying interfacial phenomena (e.g., weak hydrogen bonding). In addition, the high efficiency of the transfer also ensures dramatically enhanced NMR signals. …
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Estudo da influência da força de emparelhamento na transferência de dois nêutrons na reação 13C( 18O,16 O) 15C
… transferência de dois nêutrons na reação direta 13C( 18O,16 O) 15C, a uma energia de bombardeamento de 84 MeV. Recentemente, foram encontrados indícios de que a correlação entre dois nêutrons no processo de transferência, na reação 12C( 18O,16 O) 14C [1], desempenha um papel crucial nesse …
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Development of 13C Fingerprint Tool and Its Application for Exploring Carbon and Energy Metabolism in Cyanobacterium Synechocystis sp. PCC 6803
… This dissertation describes the development of 13C fingerprint-based method to characterize the carbon metabolic network in cyanobacteria model species Synechocystis sp. PCC 6803 and the integration of this method with metabolic flux analysis and transcriptomics analysis to quantify the diverse …
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Detecting tumour responses to treatment using metabolic imaging with hyperpolarised [1-13C]pyruvate and 2-([18F]fluoro)-2-deoxy-D-glucose
… tomography ([18F]FDG-PET) and hyperpolarised [1-13C]pyruvate magnetic resonance imaging), for the purpose of detecting early responses to treatment in mouse models of cancer. Two mouse models of lymphoma, subcutaneous EL4 tumours and Eμ-Myc transgenic mice, were treated with etoposide and …
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