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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 22 for “"N9"”.
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N9 Alkylation and Glycosylation of Purines; A Practical Synthesis of 2-Chloro-2'-deoxyadenosine
… its 2-O- or 2-N-protecting group. Regioselective N9 glycosylation of 2-acetamido-6-O-(diphenylcarbamoyl)purine with problematic glucosamine has been accomplished by protecting the amino function as a phthalimido group with consequent stabilization of the oxocarbenium cation, and lowering the …
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Cytokinin interconversion by StCKP1 controls potato tuber dormancy
… transferase family. The composition of cytokinin N9 conjugates in tuber bud and surrounding tissue is known to change on transition from a dormant state, with an increase in base and riboside types observed. Analysis of transcripts indicates an increase in abundance of StCKP1 on tuberisation of …
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On the Nature of Weak Intermolecular Forces: a First Principles Approach to Hydrogen Bonding and Pi-Type Interactions
… crystalline protein structures. The 26 toluene/(N9-methyl-)adenine model configurations constructed from protein/ligand crystal structures are investigated with explicitly correlated methods. In Chapter 5, electronic structure computations are used to systematically examine nine small hydrocarbon …
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In situ x-ray investigations of staging and sequencing potassium-graphite intercalation compounds
Experimental investigations, us i n9 x-ray diffraction techniques, have been made into the phenomenon of staging in graphite intercalation compounds. These studies have been performed in situ by means of a two-zone, high-temperature, x-ray furnace. The transition from stage 1 to stage 2 is found to …
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Directed Palladium Catalyzed Acetoxylation of Indolines and Enantioselective Total Synthesis of (–)-Voacinol and (–)-Voacandimine C
… natural product (–)-deoxoapodine. Chemoselective N9-oxidation of a pentacyclic deoxoapodine precursor enabled the synthesis of the corresponding hexacyclic C8-aminonitrile. Stereocontrolled methylenation of a C8-enamine derivative of deoxoapodine, accessed by ionization of the C8-aminonitrile, …
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Studies on the synthesis of bisindole Aspidosperma alkaloids
… natural product (–)-deoxoapodine. Chemoselective N9-oxidation of a pentacyclic deoxoapodine precursor enabled the synthesis of the corresponding hexacyclic C8-aminonitrile. Stereocontrolled methylenation of a C8-enamine derivative of deoxoapodine, accessed by ionization of the C8-aminonitrile, …
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Algorithms and hardness results for the jump number problem, the joint replenishment problem, and the optimal clustering of frequency-constrained maintenance jobs
… while previous algorithms ran in at least 0(n9 ) time. In the second part, we present a novel connection between certain sequencing problems that involve the coordination of activities and the problem of factorizing integer numbers. We use this connection to derive hardness results for three …
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TREM-2 Expression and Regulation in Inflammation and Ischaemia
… (OGD) had no direct effect on TREM-2 in N9 microglial cells. However, co-culture with healthy neurons reduced microglial TREM-2 expression, which was abolished in co-culture with OGD neurons, suggesting that in the healthy brain, microglial TREM-2 expression is suppressed by neurons, and …
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Base modified peptidic nucleic acids: synthesis and crystallographic analysis of intermediates
… generated by attaching alkyl substituents at the N9 or N7 sites of purine bases. Crystallographic analysis was undertaken to probe the regiochemistry of isomers, and to reveal interesting structural features of the new series of similarly-substituted purine bases. The attainment of the versatile …
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Wasserstoffatomdynamik in Radikalen, Clustern und Biomolekülen
… nach Bestrahlung mit UV-Licht vornehmlich das N9-H-Wasserstoffatom abspaltet und diese Abspaltung extrem schnell verläuft. Dies steht in Einklang mit einem Deaktivierungsprozess über eine repulsive Potentialkurve, wie er theoretisch vorhergesagt worden war. In natürlicher Umgebung, d.h. in …
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Ab Initio Treatment of Complex Systems Kohn-Sham Orbitals for Multi Reference Methods and the Base Pairing Properties of Xanthine
… beitragen. Paarungseigenschaften von N9-Xanthin: Zur Untersuchung der Paarungseigenschaften von N9-Xanthin wurden zun� achst H-verbrückte Homodimere von Xanthin untersucht. Hierbei wurden extreme Variationen in den Bindungsstärken der einzelnen H-Brücken gefunden, die sich zwischen -4 …
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Structural Analysis of Ernst Tinaja Canyon Focusing on Strike-Slip Faulting and Folding, Big Bend National Park, Texas
… faults mean trends in the study area are N9°W, 70°SW and NE. ii Fold axial planes in the study area have a mean strike and dip of N13°W, 71°NE and SW, and bedding in the study area is consistent and trends N25°W, 24°SW. Prominent horizontal slickenlines support the interpretation of …
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Mass, heat and nutrient fluxes in the Atlantic Ocean determined by inverse methods
… alone. The net flux of nitrate across 36°N is n9±35 kmol 8- 1 to the north and is indistinguishable from zero at 24°N (-8±39 kmol 8-1 ), leading to a net divergence of nitrate between these two latitudes. Forcing the system to conserve nitrate leads to an unreasonable circulation. The dominant …
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Pioneering new approaches to woodland ecology and human activity in medieval Ireland (c.500-1550AD): an investigation using archaeological charcoal
… Scheme and Toureen Peckaun) and Kilkenny/Carlow (N9/N10 Kilcullen to Waterford Road Scheme). These sites represented a cross section of early medieval (fifth-twelfth AD) and later medieval (post–twelfth century AD) rural settlement and the diverse range of features typically found associated with …
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O duplo enfoque contábil e administrativo no sistema de custos da indústria de óleos vegetais
… (1) atende ao que estabelece o Cecreto-Lei n9 1398, de 26/12/77, em seu art. 139 , a respeito da avaliaçâo dos estoques, para fins de inventários; (2) permite o uso de orçamentos flexiveis para fins de controle e com isso a adaptação do sistema de custeio ao nivel de produção (ou de …
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The ground and excited state molecular structure of model systems undergoing photochemical processes and the characterization of active agents by means of vibrational spectroscopy and theoretical calculations
… probably adsorbs on the silver sol through the N9 and N3 atoms, while 6MPR interacts with the surface via the N7 and probably S atoms. Around critical biological concentrations and pH values i.e. at low concentrations and almost neutral condition (pH 7-9), 6MPR interacts with the substrate …
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Singlet Oxygen Oxidation of Guanine, 9-Methylguanine and Guanine-Cytosine Base Pair: Dynamics and Kinetics Revealed by Parallel Gas- and Solution-Phase Experiments and Computations
… guanine and 9-methylguanine indicates that the N9-substitution not only affects the reaction mechanism but inhibits the reactivity of guanine toward <sup>1</sup>O<sub>2</sub>.</p> <p>In the third project, a solution-phase kinetic and mechanistic study of <sup>1</sup>O<sub>2</sub> oxidation of …
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On the calibration of some ideal and non-ideal explosives
The initial portion of this work will expound a concise, albeit limited, introduction to energetic materials, from their background and the reasons they are studied to the modern developments used in the work of this thesis. Today there are several reason why these materials are studied. The …
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Ligand-receptor interactions of Gonadotropin-releasing hormone antagonists
… in the mouse receptor consists of residues G/n9 -Glu90. Glu-C digestion of human and sheep receptors cross/inked with PAnt-1 peptide gave a labelled band of approximately 8 kDa, consistent with cleavage at residues Glu68 in both species and at residues Glu8 (human) and G/u11 (sheep). Digestion …
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