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 25 for “"OH group"”.
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Transalkylation of higher methylphenols with phenol to produce cresols and xylenols
… recovery of the valuable aromatic (phenolic) OH-groups present in the constituents of the C₉˖-phenolics fraction and also make use of the C₉˖-polymethylphenols as an active-and cheap-reagent for the methylation of the phenol, due to the activation of their aromatic rings by the OH-group. …
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HIV Reverse Transcriptase Fidelity And Inhibition Are Modulated By Divalent Cations In A Concentration-Dependent Manner In Vitro
… by the Mg2+ concentration. NRTIs lacking 3'-OH group inhibited both enzymes less efficiently in low Mg2+ than in high Mg2+; whereas inhibition by the “translocation defective RT inhibitor”, which retains the 3ʹ-OH, was unaffected by Mg2+ concentration, suggesting that NRTIs with a 3ʹ-OH group …
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Synergistic coordination of oxygen functional groups with catalyst surface promotes hydrogenolysis of lignin model compounds
… surface through coordination of multiple oxygen groups on the substrate and through the formation of Pd–O bonds. We found two parallel reaction pathways during lignin RCF. The desired pathway is the β–O–4 cleavage reaction, with an activation barrier of 75-85 kJ/mol. The second pathway is …
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Biochemical and Structures Studies of tRNA Modificaton and Repair Enzymes
… miRNAs are methylated at their 3' ends at the 2' OH position by Hen1, an S-Adomet dependent methyltransferase. Hen1 homologs in animals are shown to be responsible for the methylation of piRNAs, some siRNAs as well as endogenous siRNAs. Interestingly, a subset of bacteria also has a Hen1 homolog. …
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Biochemical and Structural Studies of RNA Modification and Repair
… colicin D, respectively, but also adds a methyl group to the same 2'OH group, which acts as a nucleophile during RNA cleavage by the ribotoxins. As a result, the repaired tRNAs resist the re-attack by ribotoxins. This repair and modification system may provide an effective mechanism to defend …
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Spectroscopic and electrochemical investigation of phenyl, phenoxy, and hydroxyphenyl-terminated alkanethiol monolayers
… alter the projection of the terminal -OH group relative to para-substitution. Contact angles were obtained for each SAM surface using water, glycerol, and ethylene glycol. From the contact angle data, Zisman and Fowkes analyses were performed in order to determine surface free energy …
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Understanding the mechanism of androgen biosynthesis
… on the pregnene- nucleus directs the 17-OH group to hydrogen bond with the Fe-O-O ligand in a manner that alternately promotes or impedes efficient lyase catalysis via this nucleophilic pathway. Finally, resonance Raman of the during stepwise thermal annealing of the cryotrapped peroxo- …
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Interactions of hydrogen with alkali promoted Ru/SiO2 catalysts: a proton NMR study
… metal and the promoter on the support hydroxyl groups were characterized via proton nuclear magnetic resonance ([superscript]1H NMR) spectroscopy. The characterization of the support at different Ru loadings indicated that the OH group density in the silica support decreased with increasing …
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Design and synthesis of potential chrome-based anti-tuberculosis agents
… were insoluble with solubility <5 μM. The OH group was critical for solubility as removing it resulted in poor solubility. Ethyl 4-(6-substituted/unsubstituted chromon-3-yl)-2-oxo-6-trifluoromethyl-1,2,3,4-tetrahydropyrimidine-5-carboxylate derivatives did not show any cytotoxicity against …
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TiO2-supported copper nanoparticles prepared via ion exchange for photocatalytic hydrogen production
… Dehydration of intra-layered and interlayered OH group during the heat treatment may induce the TiO6 group arrangement and the formation of anatase crystals as revealed by XRD results. The presence of anatase at an earlier heat treatment temperature compared with CuO indicates a faster …
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Synthesis and conformational study of trans-2-aminocyclohexanol-based pH-triggered molecular switches and their application in gene delivery
<p>Trans-2-Aminocyclohexanol (TACH) is a promising model for pH-triggerable molecular switches with a variety of potential applications. In particular, such a switch, when incorporated into cationic liposomes, provides a novel design of the pH-sensitive helper lipids for gene delivery. Protonation …
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Development of oxygenase biocatalysts for the production of synthetically useful cis-diol compounds
… and meta-substituted phenols by TDO produce cyclohexenone cis-diols. The keto group of cyclohexenone cis¬-diol tautomers increases the functionalisation and stability compared to other arene cis-dihydrodiols. (4S,5S)-dihydroxy-3-iodocyclohexe-2-en-1-one, formed from 3-iodophenol by the …
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Surface Forces in Thin Liquid Films of H-Bonding Liquids Confined between Hydrophobic Surfaces
… with an inverse orientation. An exposure of the OH-group toward the aqueous phase decreases the antipathy between the surface and H-bonding liquid and hence causes the hydrophobic (or solvophobic) forces to decrease. The second part of the study involves the measurement of the hydrophobic forces …
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Determining the in vitro anti-cancer effects of various novel indoles and an anti-microbial peptide towards a potential treatment of glioma.
… The SAR screening was divided into two main groups: indoles without a 2-aryl group and indoles with a 2-aryl group. The most potent compound identified, and its analogues, were further tested on the non-cancerous SVGp12 cell line to check for specificity of these indoles towards cancer cells, …
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Metal Complexes of Functionalised Phenanthroline-based Ligands and Their Application Towards the Transformation of CO₂
… phenanthroline-based ligands. Pendant amine groups were incorporated into the phenanthroline backbone with the vision to facilitate ligand cooperativity mechanisms to assist in the activation of CO<sub>2</sub>. This chapter focused on the synthesis of zinc halide complexes of these ligands …
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Thermochemical Interconnectivities of Active Sites on Metal Oxides and their Catalytic Consequences in C−O Formation and C−H Scission Chemistry
… at Brønsted sites or of a negatively charged ⊝OH group from adsorbed alkanol species to Lewis acid centers (Mδ+) in Lewis acid-base pairs to evolve their respective transition states. Concurrently, alkanol and alkane ODH requires the transfer of an H-atom, equivalent to the transfer of a proton …
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Cellular level investigation of water interaction with acetylated and formalized wood
… etikkahappoanhydridin asetyyliryhmä sitoutui OH-ryhmän kanssa täyttäen soluseinää. Formalisointi puolestaan johti kahden hydroksyyliryhmän (OH) ja yhden metyyliryhmän ristisilloitukseen. Molemmat mekanismit estävät veden kanssa sitoutumiskykyisten OH-ryhmien määrää, mutta ei tiedetä kuinka …
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I. In vitro selection of aptamers for perchlorate and melamine II. Towards crystallization of DNAzymes III. A highly selective lead sensor based on a classic lead DNAzyme
… for decades. However, due to the lack of 2ꞌ-OH group, DNA has once considered incapable of catalyzing any chemical reactions. With the isolation of DNAzyme, researchers have demonstrated that DNA possesses the same catalytic power that ribozyme and protein enzyme have. Although, DNAzymes have …
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Biochemical and structural studies of RNA damage and repair in bacteria
… addition of one or two NMP molecules onto the 3’-OH group of its RNA substrate and that the reaction exhibits a preference for RNA substrates resulting from damage by ribotoxins. Interestingly, RlaP-NTase preferred to utilize Mn+2 as a metal cofactor for coordinating NTP whereas most known NTases …
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Interfacial Energy Transfer in Small Hydrocarbon Collisions with Organic Surfaces and the Decomposition of Chemical Warfare Agent Simulants within Metal-Organic Frameworks
… to the interconnected hydroxyl-terminated SAM (OH-SAM) than to the organic surface with methyl groups at the interface. However, the dynamics also appear to depend on the polarizability of the impinging gas-phase molecule. The π electrons in the double bond of ethene (C2H4) and the triple bond …
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