Browsing Doctoral Degrees (Chemistry) by Title
Now showing items 28-47 of 125
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The effect of antioxidants on the Para-Aminobenzoic acid photosensitised formation of thymine dimer and singlet molecular oxygen.
(2005)On exposure to UV radiation DNA is damaged. The thymine cyclobutane dimer is one of the most significant of the lesions formed. This dimer is associated with the mutagenic and carcinogenic effect of UV radiation. It ... -
The effect of Mo(CO)₆ as a catalyst in the carbonylation of methanol to methyl formate catalyzed by potassium methoxide under CO, syngas and H₂ atmospheres.
In patents describing the low temperature production of methanol from syngas catalysed by the Ni(CO)₄/KOCH₃ system, Mo(CO)₆ was claimed to enhance the catalytic activity of the system. However, there has been no clarity ... -
Effects of novel chloroquine formulation on blood glucose concentration, renal and cardiovascular function in experimental animal paradigms.
(2011)Malaria disease poses a serious global health burden as recent reports have indicated that nearly half of the world’s population is at risk (WHO 2008). The World Health Organization (WHO) Expert Consultative Team has ... -
Electrochemical investigation of the growth of anodic films on iron and ferrous alloys.
(1994)An electrochemical investigation of the corrosion of iron and Fe18Cr based stainless steel alloys was undertaken with particular emphasis on the nucleation and growth of surface films. Chronoamperometry was shown to be ... -
Experimental and theoretical studies of hydrogen bonding.
(1995)The theoretical and experimental work in this thesis is primarily aimed at i) the quantification of the strengths of a number of hydrogen bonded systems, and ii) exploring the relationships that exist between the ... -
Experimental and theoretical studies of molecular complexes.
(1999)The binary complexes comprising the molecules hydrogen fluoride, hydrogen chloride, water, hydrogen sulphide, ammonia, phosphine, methane and silane have been studied by ab initio molecular orbital theory thus generating ... -
Extractive from seven African medicinal plants.
(2003)This PhD thesis describes a phytochemical investigation of seven medicinal plants, namely, Ledebouria ovatifolia (Hyacinthaceae), Eucomis pole-evansii (Hyacinthaceae ), Lachenalia rub ida (Hyacinthaceae), Drimia ... -
Extractives from samadera madagascariensis and toddaliopsis bremekampii.
(2004)This work involves the isolation, structural elucidation and the biological screening of compounds from the Madagascan Samadera madagascariensis and Toddaliopsis bremekampii from South Africa. Samadera madagascariensis ... -
The extractives from Sophora velutina and Calpurnia aurea and their biological activity.
(2012)This work is an account of the phytochemistry and biological activity of two related plant species within the plant family the Fabaceae, Sophora velutina from the subtribe Sophoreae and Calpurnia aurea of the subtribe ... -
Extractives from the Meliaceae and Annonaceae.
(1997)Members of the Annonaceae and Meliaceae, two plant families which are distributed throughout the world, have been studied during the course of this work. The research is an account of the compounds isolated from six members ... -
Extractives from the Meliaceae and Melianthaceae, and investigations into enamine chemistry.
(1997)Part A of this thesis is an account of the extractives isolated from one member of the Melianthaceae and two members of the Meliaceae. Plants belonging to these families are known to produce compounds with medicinal ... -
Extractives from the Meliaceae and Simaroubaceae of Madagascar.
(2001)This work describes the isolation and structural elucidation of extractives from four species of the Meliaceae and one of the Simaroubaceae families. All five species examined are endemic to the island of Madagascar. One ... -
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Extractives from the ptaeroxylaceae and the mesembryanthemaceae.
(2001)This work is an account of the investigations into the chemistry of two Cedrelopsis species from the Ptaeroxylaceae, Cedrelopsis grevei and Cedrelopsis microfoliata and a species from the Mesembryanthemaceae, Khadia alticola, ... -
Heterometallic ruthenium (II)-platinum (II) complexes : a new paradigm : a kinetic, mechanistic and computational investigation into substitution behaviour.
(2014-10-17)Abstract available in PDF file. -
The hydrogenolysis of glycerol to lower alcohols.
(2010)Much work has been done towards the hydrogenolysis of glycerol to 1,2-PDO and 1,3-PDO using various heterogeneous systems including Rh, Ru, Pt, PtRu, copper systems and Raney Ni in batch systems. However, routes to lower ... -
Hydrogeochemical modeling of the speciation and leaching of fly ash co-disposed with water, brines and organics : a case study of Sasol-Eskom coal ash disposal, South Africa.
(2013-12-06)Two coal utility plants in South Africa selected (one from Sasol and another from Eskom) for this study produce large volumes of fly ash (over 40 Mt from Eskom at Tutuka, and 3 Mt from Sasol Synfuels at Secunda annually), ... -
Imidazolium, phosphonium and pyridinium ionic liquids with flourinated anions : synthesis characterization and applications.
(2013)Four sets of ionic compounds were synthesized, each with an organic spacer between two ligands creating a dication with the bromide as the counter anion. In each of the sets of ionic compounds, the counter anion was ... -
The incorporation of impurities into sucrose crystals during the crystallisation process.
(1998)The main objective of this work is to propose a mechanism for the transfer of impurities into the sucrose crystal. To this end the transfer of impurities into the sucrose crystal was investigated, under crystallisation ... -
Influence of bridging groups on the reactivity of dinuclear platinum (II) complexes with bis(2-pyridylmethyl)amine chelate headgroups.
(2009)The influence on the reactivity of both the length as well as the structural nature of diamine bridges linking dinuclear Pt(II) complexes with homotopic bis(2-pyridylmethyl)amine headgroups has been investigated. For this ...
