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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.
Search results
Showing 61 to 70 of 258 (0.012 seconds)| 61 |
The structure of gum tragacanthBaillie, J. January 1961 (has links)
No description available.
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Studies on the molecular structure and enzymic degradation of polysaccharidesCunningham, William Lennox January 1961 (has links)
No description available.
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Starches and related polysaccharides in barley and maltMcArthur, W. January 1954 (has links)
No description available.
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Methylated derivatives of fructoseMitchell, William E. A. January 1953 (has links)
No description available.
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| 65 |
Synthetic and stereochemical investigations in carbohydrate chemistryRiddell, William January 1964 (has links)
No description available.
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| 66 |
Studies on the reactivity of carbohydratesRoberts, Earle V. E. January 1965 (has links)
No description available.
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| 67 |
Structural studies in the hemicellulose groupWilkie, Kenneth C. B. January 1955 (has links)
No description available.
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| 68 |
Synthetic and mechanistic studies in carbohydrate chemistryYule, Kerr Carmichael January 1964 (has links)
The aim of the work described in this thesis was to synthesise a sugar having the ring oxygen replaced by sulphur. 5-Deoxy-5-thio-D-xylopyranose and a number of its derivatives were successfully synthesised. This led to the study of the reactivity of these compounds and their oxygen analogues in some typical carbohydrate reactions. The results of these experiments provided further evidence concerning the mechanisms of certain carbohydrate reactions. Part I : A discussion of the physical and chemical properties of analogous oxygen and sulphur compounds. This discussion was of interest in connection with the comparison of the reactivity of sulphur sugars and their oxygen analogues, and particularly, because a comprehensive survey of this type is not available in the literature. Part II : 5-Deoxy-5-thio-D-xylopyranose and its derivatives. Section I of this part described the preparation and properties of 5-heoxy-5-thio-D~xylopyranose. Evidence, based on UV and IR spectroscopy, N.M.R. studies, chemical reactions, and mutarotation studies, is presented as proof of the existence of the sulphur ring. The mutarotation reaction of 5-deoxy-5-thio-D-xylopyranose and its oxygen analogue was carried out in two buffered solutions of different pH and the results compared. The production of 2-thiophenaldehyde and 2-furfuraldehyde from 5-deoxy-5-thio-Dxylopyranose and its oxygen analogue respectively was studied. Section II describes the preparation, reactions, and methanolysis of 2,3,4-tri-0-acetyl-5-deoxy-5-thio-α-Dxylopyranosyl 1-bromide. The reactions included the Koenigs- Knorr reaction and the reaction of the acetobromide with silver acetate. The results of the methanolysis of the sulphur sugar acetohalide and its oxygen analogue were in agreement with the accepted unimolecular mechanism, and the fact that the oxygen-ring sugar reacts forty times faster than its sulphur analogue is satisfactorarily explained. Section III describes the preparation and hydrolysis of methyl 5-deoxy-5-thio-α- and β-D-xylopyranosides. The kinetic results of the hydrolyses of these methyl glycosides and of methyl β-D-xylopyranoside enabled us to lend support to one of two proposed mechanisms for the acid hydrolysis of glycosides.
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Studies on the polysacchardes of Iceland moss (Cetrara islandica)Chanda, N. B. January 1952 (has links)
No description available.
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| 70 |
Problems in the physical chemistry of starch, with special reference to amylose-amylopectin relationshipsCowie, John McK. G. January 1958 (has links)
No description available.
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