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Showing 1 to 20 of 113 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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Rotationsspektroskopische und quantenchemische Studien zur Methyltorsion in halogenierten Dimethylethenen
Halogenodimethylethenes (1-halogeno-2-methylpropene, E-2-halogeno-2-butene, and Z-2-halogeno-2-butene) have two internally rotating methyl groups. Using MB-FTMW-spectroscopy the splittings of the rotational transition caused by internal rotation and nuclei quadrupole coupling were resolved. By …
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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 Soc., 1979, 109, 4571), except that the methyl groups on the phenolic residues have been replaced by tert-butyl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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Aluminiumorganisch stabilisierte Übergangsmetallkolloide : Synthese, Bildungsmechanismus und Aufbau von organisierten Strukturen
… of Pt(II)-acetylacetonate with aluminumtrimethyl. A novel di-platinum complex was identified as the key intermediate of the colloid formation. This complex decomposes in solution under formation of nanoscopic platinum particles with a mean diameter of 1.2 nm. The formation of these …
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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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Chirale intramolekular koordinierte Alane
… analysis of the 1H-NMR signals of the N-bound methyl groups. The dynamic behaviour of compounds with fourfold coordinated aluminum has been observed during NOE experiments performed with Ar*AltBuBr.
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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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