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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.
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Showing 301 to 310 of 9201 (0.437 seconds)Spelling suggestions: "subject:"bsynthesis)"" "subject:"csynthesis)""
| 301 |
Model studies on the spiro intermediateHawker, Craig Jon January 1988 (has links)
No description available.
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| 302 |
Biomimetic anthraquinone dyesBurton, S. J. January 1986 (has links)
No description available.
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| 303 |
The biosynthesis of canescinLewis, C. N. January 1986 (has links)
No description available.
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| 304 |
Oxytocin secretion and the action of prostaglandin Fâ†2#alpha# on the sheep corpus luteumMcCann, Terry January 1989 (has links)
No description available.
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| 305 |
Synthetic models of cytochrome P450 and photosynthesisRice, M. J. January 1986 (has links)
The work presented in this dissertation describes the prepartion and characterisation of various strapped porphyrin compounds which are designed to model cytochrome P450 and the charge separation in photosynthesis. The major part of this work is concerned with models of cytochrome P450. After a brief introduction to the philosophy of modelling, there follows a review of work on the enzyme and various compounds which are designed to reproduce the enzymic characteristics. The synthesis of two singly bridged porphyrins is reported. These incorporate a pendent methyl ester in the centre of the strap and aim to mimic the proposed acylation step in the catalytic cycle. Evaluation as models was performed by a series of experiments involving the addition of potassium superoxide to the manganese complexes of these compounds. Characterisation of the mode of reactivity required the use of many physical techniques and necessitated the synthesis of a radio-labelled sample of one of the porphyrins. The results obtained suggest that superoxide binds preferentially to the bridge-free face of the macrocycle. Doubly bridged analogues of the above models were prepared which force the two faces of the porphyrin to be equivalent. Superoxide binding studies indicated a different mode of reactivity to the singly bridged models, for one of the compounds, and experiments to distinguish between possible interpretations of the results are suggested. A crown ether thiolate doubly bridged porphyrin was prepared as a model for the carbon monoxide complex of the enzyme. This was characterised by ultraviolet spectroscopy and attempts to produce a stable crystalline adduct are described. The remaining part of this work concerns a model for the charge separation process in photosynthesis. A discussion of natural systems and previous models is followed by a description of a tetraene pyromellitimide doubly bridged porphyrin, which shows significant quenching of the porphyrin fluorescence.
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| 306 |
Photodimerisation of alpha, beta-unsaturated ketones in the solid stateMoulden, N. January 1984 (has links)
No description available.
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| 307 |
Gallosilicate zeolitesLiu, X. January 1986 (has links)
No description available.
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| 308 |
Muscle protein metabolism : Measurement and manipulation in lambsOddy, V. H. January 1986 (has links)
No description available.
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| 309 |
Studies towards the synthesis of histrionicotoxin and other ion-channel blockersButlin, R. J. January 1986 (has links)
No description available.
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| 310 |
The dibenzophosphole modification of the Wittig-Horner reactionElliott, J. M. January 1986 (has links)
No description available.
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