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 316 for “"EPI"”.
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Stereochemistry and Mechanism of the Enzyme -Catalyzed Cyclizations of Farnesyl Diphosphate to the Sesquiterpenes Epi -Aristolochene, Epi-Eremophilene and Vetispiradiene
Chiral methyl FPPs were prepared by the displacement of allylic monodeuterated diethyl phosphates with LiBEt3T. (12R)- and ( 12S)-[12-2H1, 12-3H 1]FPPs were incubated with TEAS, and the 3H NMR spectra showed that several tritiated compounds were present. The facial selectivity of the proton …
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Electric stimulation parameters for an epi-retinal prosthesis
… to contribute to the development of an epi-retinal prosthesis which may someday restore vision to patients blinded by outer retinal degenerations like retinitis pigmentosa. By stimulating surviving cells in tens or hundreds of distinct regions across the retinal surface, the prosthesis …
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Simultaneous multislice spiral and EPI chemical shift imaging
The current prominent excitation methods of 3D slabs used for MR Spectroscopy Imaging (MRSI) include long dead times in each TR. This dead time is necessary for magnetization moments' longitudinal relaxation, and so a good SNR efficiency. The fact that SNR is one of the dominant challenges that …
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APPROACHES TO THE TOTAL SYNTHESIS OF DICTYOSTATIN AND SYNTHESIS OF EPI-DICTYOSTATINS
… highly stereoselective total synthesis of (+)-9-epi-dictyostatin, whose key steps is the coupling reaction between two fragments, C1-C9 and C10-C26, followed by Yamaguchi macrolactonization and global deprotection. Eleven stereogenic centers and four stereogenic double bonds were obtained with a …
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Sculpting the narrative : the material practice of Epi-Olmec art and writing
… is known about the people who produced this “Epi-Olmec” hieroglyphic program, and previous studies of these artifacts have focused almost exclusively on questions of linguistics and decipherment and not material context or iconographic content. The object of this dissertation is thus to create …
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Synthesis of unnatural analogues of narciclasine: Chemoenzymatic synthesis of 2-epi-1-hydroxymethylnarciclasine
… existing to date. The synthetic route to 2-epi-1-hydroxymethylnarciclasine, as well as a possible route to several other derivatives, is described in detail. Experimental and spectral data are provided for all newly synthesized compounds.
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Structure, Function and Applications of Metal-Requiring Enzymes: Carbonic Anhydrase and Epi-Isozizaene Synthase
… anhydrase IX and XII. Structural Studies of epi-Isozizaene Synthase from Streptomyces coelicolor The X-ray crystal structure of recombinant epi-isozizaene synthase (EIZS), a sesquiterpene cyclase from Streptomyces coelicolor A3(2), has been determined at 1.60 Å resolution. Specifically, the …
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Self-navigated prospective motion correction of repeated 3D-EPI acquisitions for functional MRI applications
… pulse sequences – known as echo-planar imaging (EPI) – to repeatedly image the whole brain as stacks of two-dimensional slices. Two-dimensional EPI (2D-EPI) is preferred over threedimensional (3D)-EPI as it is more motion robust. However, 3D-EPI offers various advantages over 2D-EPI for …
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The chemistry of thujone : new enantioselective syntheses of Ambrox[Registered trade mark] and Epi-Ambrox
… a new synthetic approach to(-)-Ambrox® (2) and epi-Ambrox (3) using thujone (1) as an enantiopure building block. Thujone (1), a readily available starting material obtained from Western red cedar, can be efficiently converted to D-cyperone (144), which can be chemically elaborated to obtain the …
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Real-time motion and main magnetic field correction in MR spectroscopy using an EPI volumetric navigator
In population groups where subjects do not lie still during Magnetic Resonance Spectroscopy (MRS) scans, real-time volume of interest (VOI), frequency, and main magnetic field (B0) shim correction may be necessary. This work demonstrates firstly that head movement causes significant B0 disruption …
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Crescita epitassiale e caratterizzazione di un epi-layer spesso di 4H-SiC per la rivelazione di neutroni
… spettroscopica di uno spesso strato epitassiale di SiC 4H, precedentemente cresciuto, e un confronto dei risultati tra i campioni prima e dopo un processo di ossidazione termica effettuato a 1400 C per 48 ore. Attraverso spettroscopie Raman e fotoluminescenza (PL), sono stati valutati …
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Estudi i selecció d’un sistema de gestió d’uniformitat i Equips de Protecció Individual (EPI) per a una administració pública
… permeti gestionar tant la uniformitat com els EPI’s (Equips de Protecció Individual) en una administració pública, amb el context i les peculiaritats que aquesta té, tant a nivell de gestió com a nivell de contractació. En un context cada vegada més complex, acomplir amb els requeriments en …
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The Development of Di-N-Acetyl-L-Pyranosides for the Synthesis of Pseudaminic Acid and 8-epi-Legionaminic Acid
Pseudaminic acid, Legionaminic acid, and epimers are key bacterial nonulosonic acids found in the flagella of pathogenic bacteria. These sugars are found to be crucial to flagellar assembly and are thus attractive targets for raising an immune response against. By retrosynthetic analysis, we …
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Fabrication and Optimization of Single-Junction GaAs Thin Film Solar Cells on Epi-ready Flexible Metal Tapes for Low-cost Photovoltaics
… cells, we have developed a technology to grow epitaxial semiconductor thin films on low-cost flexible epi-ready metal tapes that can replace the expensive wafers. The template layers on the epi-ready metal tapes are grown via a roll-to-roll process using Ion Beam Assisted Deposition (IBAD). …
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