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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
21

Effects of mixing on fermentation kinetics

Sotiriou, George January 1987 (has links)
No description available.
22

Kinetic mechanism of NAD-malic enzyme from Ascaris suum in the direction of reductive carboxylation of pyruvate

Mallick, Sushanta 12 1900 (has links)
For this pseudoquadreactant enzymatic reaction (Mn2+ is a psuedoreactant), initial velocity patterns were obtained under conditions in which two substrates were maintained saturating while one reactant was varied at several fixed concentrations of the other.
23

Kinetics in aqueous and microhetero-geneous systems

Briggs, Barbara January 1985 (has links)
Rate constants for chemical reactions in various aqueous and micro- heterogeneous systems have been measured and analysed. A large part of the thesis is concerned with interpreting kinetic trends in two water-in-oil microemulsions. Kinetic data for inorganic reactions involving low-spin iron (II) di-imine oorplexes and for reactions involving the organic substrates, 2,4-dinitrochlorobenzene, crystal violet and malachite green in microemulsions have been collected and used to identify different structural zones in these solvent systems. The kinetic data are interpreted in terms of a model in which reaction occurs at an interfuse. Reactions involving cis-bis(pyridine)tetracarbonylmolybdenum (0) in oil- in-water, water-in-oil microemulsions and organic solvent mixtures have been studied. Aquation reactions of iron (II) hexadentate Schiff base have been used to identify microheterogeneous phases in water-rich '2-butoxyethanol + water' mixtures. Solvent effects on initial and transition states are discussed for reactions of iron (II) glyoxal bis-N methylamine with hydroxide ions in 'methanol + water' mixtures and reactions of iron(II) 1,10-phenan- throline with hydroxide ions in 'isopropanol + water' mixtures. Transfer chemical potentials for single ions, in 'acetone + water' mixtures, have been estimated, using solubility data for salts in conjunction with the assumption that transfer chemical potentials for tetraphenylboronate and tetraphenylarsonium ions are equal. Effects of added salt on the neutral hydrolysis of phenyldichloro- acetate in aqueous solutions are examined in terms of solvent cosphere interactions between ions. The temperature dependence of rate constants for reactions of iron (II) 4-methyl, 1,10-phenanthroline have been examined. The results are discussed in terms of isobaric, isothermal and isochoric activation parameters. The meaning of the term 'isochoric' is clarified in this context.
24

Kinetics of reactions in aqueous solutions

Hakin, Andrew William January 1987 (has links)
Rate constants for chemical reactions in various aqueous systems have been measured and analysed. A major part of this thesis discusses the effect of added salts on the reaction kinetics of organic substrates and the effect of added cosolvent on iron(II) complexes in solution. The thesis discusses the properties of aqueous solutions with reference to the prediction of trends in kinetic parameters. Transfer chemical potentials for single ions in 'urea + water' mixtures have been estimated, using solubility data for salts in conjunction with the tetraphenylarsonium tetraphenylboronate assumption. Solvent effects on the initial and transition states for reactions between iron (II) 1,10-phenanthroline and iron(II) glyoxal bis-N methylamine with hydroxide ions are also reported. Solvent effects on initial and transition states for reaction between three iron (II) complexes and hydroxide ions in 'methanol + water' mixtures are reported. Effects of added salt on the neutral hydrolysis of phenyldichloroacetate and the para-methoxy derivative are discussed in terms of solvent cosphere interactions between ions. With regard to computer-based studies osmotic coefficients for ammonium, alkylammonium and azoniaspiroalkane halides have been used with Pitzer's equations and the ideas of Wood et al to produce pairwise Gibbs function cosphere-cosphere interaction parameters. The effects of added salt on rate constants for the alkaline hydrolysis of the sodium salt of bromophenol blue are reported and analysed using Pitzer's equation for the activity coefficients of single ions in aqueous salt solutions. Internal pressures of water and deuterium oxide in the region 273.15? T/K ?373.15 and 0? P/bar ?1000 have been calculated and fitted to an equation based on a Taylor expansion about internal pressure ?i (?,0) at temperature T = 0 and pressure p = n. Calculations are reported which shed light on the controversy concerning the isobaric heat capacities for activation for the solvolysis of alkyl halides in water.
25

Neutral and heavy nucleophiles in aromatic nucleophilic substitutions

Yeung, Hin-wing, 楊顯榮 January 1967 (has links)
toc / Chemistry / Master / Master of Science
26

The oxidation of hypophosphate: an interesting puzzle

蔡枝松, Choi, Chee-chung, Lawrence. January 1969 (has links)
published_or_final_version / Chemistry / Master / Master of Science
27

Kinetic and mechanistic studies of octahedral cobalt (III) complexes containing a macrocyclic quadridentate secondary amine

呂志強, Lui, Che-keung. January 1972 (has links)
published_or_final_version / Chemistry / Master / Master of Science
28

Kinetic studies of octahedral cobalt complexes

陳鳳潔, Chan, Fung-kit. January 1970 (has links)
published_or_final_version / Chemistry / Master / Master of Science
29

Steric effects in the aquation of octahedral cobalt (III) complexes

鄒華堅, Chau, Wah-kin. January 1973 (has links)
published_or_final_version / Chemistry / Master / Master of Science
30

Structural and mechanistic studies of cobalt (III) complexes containing a macrocyclic quadridentate Schiff baseamine

溫雲基, Wan, Wan-kei. January 1973 (has links)
published_or_final_version / Chemistry / Master / Master of Philosophy

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