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.
Results
Showing 1 to 20 of 484 for “"mechanistic studies"”.
-
Mechanistic Studies in Tellurium Chemistry
The reduction of p-ethoxyphenyltellurium trichloride by sodium sulphite and metabisulphite has been investigated. The reactions have stoichiometries of one mol of p-EtOPhTeCl₃ to 1.5 and 0.75 mol of SO₃²⁻ and S₂O5²⁻ respectively. The paths of the reaction mechanisms with both reducing agents are …
-
Mechanistic Studies in Ruthenium Chemistry
The studies described in this thesis are predominantly concerned with the investigation of possible starting compounds of use in preparative ruthenium chemistry. Especially with those compounds which might lead conveniently to the formation of compounds of interest in mechanistic and photochemical …
-
Mechanistic studies of organotellurium chemistry
The oxidation of bis(p-ethoxyphenyl) ditelluride by hydrogen peroxide has been studied kinetically. The reaction monitored was an oxidation from tellurium(I) to tellurium(II). The reaction stoichiometry ratio was found to depend upon the initial reagent concentrations. The presence of dioxygen was …
-
Mechanistic studies of lanthipeptide biosynthesis
… described in chapters 6 and 7, provides mechanistic insights into these subtilisin-like proteins and reveals their potential as sequence-specific proteases. In addition, structural elucidation of four prochlorosins, a set of lanthipeptides synthesized by a highly substrate-tolerant …
-
Mechanistic studies of ABC transporters
… different conformations. Multiple contradicting mechanistic models have been proposed based on biochemical and structural characterizations of different ABC transporters. The major issues of the controversy include, whether a common mechanism can be applied to all ABC transporter, and if not, …
-
Mechanistic Studies of Donor-Acceptor Cyclopropanes
Cyclopropane 1,1-diesters have been investigated as a source of donor-acceptor cyclopropanes, providing an understanding of the mechanism of reaction between these cyclopropanes and nitrosoarenes, as well as azo dicarboxylates. Cross-over experiments have been utilized to provide key pieces of …
-
Mechanistic studies on mannuronan C5-Epimerase
The Pseudomonas aeruginosa algG gene product is a mannuronan C5-epimerase, which converts mannuronate to guluronate residues within the polysaccharide, alginate. The aim of this work was to purii' the epimerase and determine optimum reaction conditions for its enzymic activity. The epimerase was …
-
Some Mechanistic Studies of Organotellurium Chemistry
The work in this thesis is concerned with the mechanistic study of some organotellurium compounds, especially the diaryl-ditellurides. The effect of visible irradiation on the diaryl ditellurides in solution cantaining alcohol is described. The photoreaction was found to proceed under aerobic …
-
Mechanistic Studies of Rhodium Oxidation Catalysts
Over the past eight years a number of catalytic processes for the O(,2) oxidation of terminal olefins have been proposed to proceed through non-free radical, non-Wacker mechanisms involving the coordination of O(,2) and olefin to a rhodium(I) catalyst. One particularly promising system is the Rh/Cu …
-
Mechanistic studies of the ClpAP protease/
CIpA, a member of the Hspl00/Clp subset of the AAA+ superfamily, is an energy-dependent chaperone, disassembling and remodeling its protein substrates. CIpA also serves as the ATPase component of the ClpAP protease, where it is resonsible for binding specific substrates and unfolding and …
-
Mechanistic studies of a AAA+ protease
AAA+ proteases are present in all branches of life and responsible for the energy-dependent degradation of most cytosolic proteins. Substrates for AAA+ proteases are unfolded and translocated into a compartmental peptidase. The requirement for protein unfolding raises several questions. How easily …
-
Spectroscopic and mechanistic studies of nitrogenase
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Chemistry, 1996.
-
Synthetic and mechanistic studies in polynitroaromatic chemistry.
This project developed from an industrial need for a plasticiser for explosives formulations which is easier to manufacture, more stable than those presently employed, but still based on a polynitroaromatic nucleus. The major aim of this programme was to produce new liquid or low melting …
-
Puncture Reversal of Polyethylene Ionomers - Mechanistic Studies
Ionomers are polymers that contain ionic groups in relatively low concentrations along the polymer backbone. These ionic groups, in the presence of oppositely charged ions, form aggregates that lead to novel physical properties of the polymer. React-A-Seal® and Surlyn® are …
-
Mechanistic studies in carbene and polyurethane chemistry
… (pMDI).</p><p>Computational and NMR studies of a DABCO-isocyanate complex were performed and it was concluded that the equilibrium concentration of this complex was too low to measure.</p><p>Preliminary results were acquired using a reaction calorimeter in the mechanistic studies of …
-
Mechanistic studies of rabbit muscle glycogen phosphorylase
… nucleophile, possibly Tyr-573. X-ray structural studies of the inactivated T-state enzyme identified Tyr-573 as a likely candidate for the inactivation, and further, identified a surface amino acid (His-73) covalently bonded to the C-2 position of a second molecule of the affinity label, the …
-
Ferritin: Mechanistic Studies and Electron Transfer Properties
… of hydrogen peroxide detected in previous studies on animal ferritins. Extensive experimental data on identifying the species in competition for peroxide equivalents point to a surprising conclusion that H2O2 generated in the ferroxidase reaction is consumed by amine buffers that are …
-
Mechanistic Studies in the Organic Solid State
Made available in DSpace on 2014-12-13T20:10:38Z (GMT). No. of bitstreams: 1 7915323.pdf: 6588440 bytes, checksum: ce2d8d5795da055a8c16fdc27910dbbc (MD5) Previous issue date: 1979
-
Mechanistic studies on iridium catalyzed allylic substitution
Mechanistic studies on iridium catalyzed allylic substitution reactions catalyzed by iridium phosphoramidite complexes revealed that the active catalyst is generated through a base assisted cyclometalation of the phosphoramidite to form five-membered iridacycle. A mechanism for the reaction was …
Page 1 of 25