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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 108 for “"Methyl groups"”.
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The effect of methyl groups on nucleophilic substitution reactions of chlorocyclotriphosphazenes
The reactions of methyl-substituted chlorocyclotriphosphazenes with aryl Grignard reagents and with bifunctional amines, aminoalcohols, and alkoxides were investigated. The characterization data for the compounds formed in the reactions of monomethylpentachlorocyclotriphosphazene and the Grignard …
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ΜΕΛΕΤΗ ΠΑΝΩ ΣΤΗΝ ΠΕΡΙΒΑΛΛΟΝΤΙΚΗ ΜΕΘΥΛΙΩΣΗ ΤΩΝ ΜΕΤΑΛΛΩΝ ΥΔΡΑΡΓΥΡΟΥ, ΚΑΣΙΤΕΡΟΥ ΚΑΙ ΜΟΛΥΒΔΟΥ ΣΕ ΥΔΑΤΙΚΑ ΟΙΚΟΣΥΣΤΗΜΑΤΑ
… THE CONDITIONS UNDER WHICH THE TRANSPORT OF METHYL GROUPS TO METAL SPECIES, NAMELY HG, SN AND PB, IS TAKING PLACE INTHE ENVIRONMENT.
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Electron Transfer in a Series of Mixed-Valence Copper(ii)-Copper(i) Complexes (Epr, Electrochemistry, It Bands, Magnetism)
… Chem. Soc., 1979, 109, 4571), except that the methyl groups on the phenolic residues have been replaced by tert-butyl
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Studies on CheA(B): Phosphorylation, methylation and behavioral control during chemotactic signal transduction in Bacillus subtilis
… upon addition of chemoeffectors. Furthermore, methylation of the MCPs, in which methyl groups are transferred away to an acceptor and replaced by methyl groups from S-adenosylmethionine, is regulated by CheB$\sb{\rm B}$, whose activity is controlled by CheA$\sb{\rm B}$.
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The Synthesis of 5-(p-Methoxyphenyl)-Hexahydroindanedione-1,7-Delta3-9
… of double bonds in the rings, angular methyl groups, the presence of oxygen, hydroxyl, or other groups, and, in certain cases, there may be a break in one of the rings.
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Phenylene Ethynylene Foldamers: Cooperative Conformational Transition, Twist Sense Bias, Molecular Recognition Properties, and Solid -State Organization
… on chain length. The addition of nonpolar methyl groups to the oligomeric backbone was found to stabilize the helical conformation. Circular dichroism spectroscopy was used to show that the attachment of a chiral, polar side chain results in a twist sense bias of the helical conformation. A …
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Carboxyl Methylation of Non-Histone Chromosomal Proteins
<p>The <u>in vitro</u> methylation of non-histone chromosomal proteins (NHCP) was investigated in nuclei isolated from the brain, liver, and thymus of 6-8-day-old rats. After incubating the nuclei in the presence of 20 μM S-adenosyl-L-[methyl-<sup>3</sup>H]methionine(l Ci/mmol), the NHCP were …
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Solid-state NMR (¹³C, ²⁷Al and ²⁹Si) study of the reaction between AlMe₃ and the silica gel surface
… reaction between the silica gel surface and trimethylaluminum (AlMe3) has been studied in this thesis research. We have examined the AlMe3/silica reaction in the following stages: the initial AlMe3-reacted silica surface after it had been treated with AlMe3; the AlMe3-treated surface after it …
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Studies of a DNA modification methyltransferase from Rhodobacter sphaeroides
The DNA methyltransferases represent an interesting class of enzymes for the study of protein-DNA interactions due to their high specificity, structural simplicity, and biological importance. RsrI methyltransferase (M$\cdot$RsrI) from Rhodobacter sphaeroides recognizes duplex d(GAATTC) and deposits …
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Effect of Backbone Structure on Membrane Properties for Poly(arylene ether) Random and Multiblock Copolymers
… hydrophobicity bisphenols. Addition of benzylic methyl groups on the bisphenols, was the method undertaken to increase the hydrophobicity. The combination of reduced fluorine content along with the addition of methyl groups resulted in multiblock copolymers with extremely low water uptake and …
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Study of Substituted Benzenesulfonate-Containing Layered Double Hydroxides and Investigation of the Hexamethylenetetramine Route of LDH Synthesis
… para-substituted with amine, chloride and methyl groups were successfully incorporated into layered double hydroxides of two different compositions, 2:1 Mg-Al LDH and 2:1 Zn-Al LDH. These parent materials were also doped with small amounts of nickel and the differences in the two systems …
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Structure, Function & Dynamics At The Membrane
… propose a novel third site. Next, NMR-derived methyl side chain order parameters have been shown to be important in the thermodynamics of intermolecular interactions. Molecular simulation has become routine in investigations of protein dynamics with atomic-level information, yet their accuracy …
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The syntheses of some naturally derived naphthoquinones
… vanillin the key intermediate 2-(2'-benzyloxy-6'-methyl-4'-methoxybenzoyl)-1,4,5,6,8-pentamethoxynaphthalene was prepared in six simple steps in an overall yield of 18%. This key intermediate was converted into bikaverin utilizing two independent routes. In the first route the benzyl group was …
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Application of Functional Amyloids in Morphological Control and in Self-assembled Composites
… fibrils require interdigitation of methyl groups on alanine (A), isoleucine (I), leucine (L), and valine (V). At higher concentration, globules do not have the same interdigitation of methyl groups but more random hydrophobic interactions. The concentration dependence of the …
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Hormonal regulation of phosphatidylcholine metabolism in Apium graveolens
… increase in flux through the phospholipid methyltransferase pathway upon long term exposure to gibberellic acid in conjunction with a decrease in CTP: phosphocholine cytidylyltransferase activity. Inhibition of phosphatidic acid production in these cultures resulted in a further increase in …
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Determining the Crystal Structure of Cellulose III by Modeling
… of 13 cellotetraose chains terminated by methyl groups for each of the 54 starting structures were optimized with MM3(96). Hydroxyl groups on 16 of these 54 structures reoriented to give very similar hydrogenbonding schemes in the interiors, along with the lowest energies. The one-chain …
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Benzophenone Derivatives of Hexitols in tthe Carbohydrate Series
It is known that hydroxyl groups in sugars have been blocked by various methods to facilitate analytical, synthetic and structural problems. Benzoates, methyl groups, acetal groups, etc. have been used for this purpose. |For example, compounds of glucosides with aromatic aldehydes were synthesized …
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The chemistry of some polysubstituted derivatives of di - and triphenylmethane dyes
… Green containing chloro, fluoro, methoxy and methyl groups in the phenyl ring have been synthesised and their respective visible absorption spectra compared with that of Malachite Green. In most cases where steric effects are unimportant an additive relationship is found between the electronic …
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