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A critical study of the determination of molybdenum in plant materialGore, William Tompson January 1961 (has links)
1. Polarographic and spectrophotometric methods for the determination of molybdenum were reviewed. 2. The inclusion of salicylaldoxine in several supporting electrolytes was examined with a view to developing a polarographic procedure, suitable for routine analyses, which did not necessitate a preliminary time-consuming separation stage. A stable molybdenum wave was obtained from an electrolyte having a composition similar to the test solution obtained after the wet digestion of plant material. The height of the wave was found to be, over an optimum range, independent of the reagent concentrations. The wave was however distorted by a maximum, which rendered it unsuitable for quantitative analytical application. 3. The spectrophotometric procedure for molybdenum using thiocyanate is virtually specific and was examined critically. Modifications were found to improve the sensitivity of the procedure, and the stability of the chromatic compound. 4. The modified spectrophotometric procedure is recommended for the routine determination of molybdenum in plant material.
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Influence of certain cations on the intensities of spectral emissions observed in flame excitationWeaver, Robert Dunning. January 1955 (has links)
Call number: LD2668 .T4 1955 W43 / Master of Science
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Triterpenoid and other constituents from the leaves of some Castanopsis and Lithocarpus species of the Hong Kong Fagaceae高蝶仙, Ko, Dip-shin, Phyllis. January 1972 (has links)
published_or_final_version / Chemistry / Doctoral / Doctor of Philosophy
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Enantioselective total synthesis of (-)-16-hydroxytriptolideLui, Bob., 呂思奇. January 2005 (has links)
published_or_final_version / abstract / Chemistry / Doctoral / Doctor of Philosophy
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PHYTOCHEMICAL INVESTIGATION OF AMSONIA GRANDIFLORA FAMILY APOCYNACEAE.Wahyuono, Subagus. January 1985 (has links)
No description available.
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A phytochemical study of Schefflera umbellifera and Elephantorrhiza elephantina.Mthembu, Xolani Sabelo. January 2007 (has links)
In this study, two plant species, Schefflera umbellifera (Araliaceae) and / Thesis (M.Sc.) - University of KwaZulu-Natal, Pietermaritzburg, 2007.
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Extractives from the Meliaceae and Ptaeroxylaceae.Naidoo, Dashnie. January 2001 (has links)
This work is an account of the extractives from one member of the Meliaceae and one member of the
Ptaeroxylaceae. In all, thirteen compounds have been isolated, of which four have not been described
previously.
Neobeguea mahafalensis belongs to the Neobeguea genus and has been classified into the Swietenieae
subfamily of the Meliaceae. Neobeguea mahafalensis seeds obtained from Madagascar were investigated
for the presence of limonoids. This is the first time extracts of the seeds were investigated. Previous work
was done on the stem bark of this species. An andirobin-type limonoid, methyl angolensate (5), two
mexicanolide-type limonoids, mexicanolide (6), khayasin (7), and three protolimonoids, sapelin E acetate
(8), sapelin C (9) and grandifoliolenone (10), have been isolated in this work. One of these was novel.
Cedrelopsis grevei belongs to the Cedrelopsis genus and has been classified into the Ptaeroxylaceae
family. Extracts from the stem bark of Cedrelopsis grevei obtained from Madagascar yielded seven
compounds, a triterpenoid, β-amyrin (15), a coumarin, scoparone (16), a limonoid, cedmiline (14), a
triterpenoid derivative, cedashnine (17), a quassinoid, cedphiline (19), a lignan, cedpetine (18) as well as
sitosteryl β-D-glucopyranoside (20). Three of these were novel. / Thesis (M.Sc.)-University of Natal, Durban, 2001.
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Extractives from the Meliaceae.Monkhe, Thabo Vincent. January 1991 (has links)
No abstract available. / Thesis (M.Sc.)-University of Natal, Durban, 1991.
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Muthi compounds from indigenous Lauraceae and Rubiaceae species.Horn, Marion Magdalena. January 1996 (has links)
No abstract available. / Thesis (M.Sc.)-University of Natal, Pietermaritzburg, 1996.
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Structural determination of natural products using spectral methodsTempesta, Michael Steven January 1980 (has links)
No description available.
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