Browsing School of Chemistry and Physics by Title
Now showing items 442-461 of 705
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Phytochemical, elemental and biotechnological study of cryptocarya latifolia, an indigenous medicinal plant of South Africa.
(2013)Cryptocarya latifolia (Lauraceae) is an indigenous South African plant used in ethnomedicinal practices. Traditional healers in KwaZulu-Natal, South Africa are extensively using the bark of C. latifolia as a substitute for ... -
Phytochemistry and bioactive natural products from Lannea alata, Lannea rivae, Lannea schimperi and Lannea schweinfurthii (anacardiaceae)
(2014)Abstract available in PDF file. -
The phytochemistry and biological activity of secondary metabolites from Kenyan Vernonia and Vepris species.
(2012)This work is an account of the phytochemical analysis of two genera, Vernonia and Vepris which are used as remedies for illness by the Kalenjin community of Kenya. Species of Vernonia are known to yield sesquiterpene ... -
Phytochemistry and quorum sensing inhibitory studies of four vernonia species growing in Nigeria.
(2017)Abstract available in PDF file. -
Phytochemistry of Dais cotinifolia L.
(2018)Many plant-derived secondary metabolites have interesting biological activities and some plant compounds such as artemisinin (antimalarial) and vincristine (anticancer agent) are the active principles of main-stream ... -
Planetary waves and the global ozone distribution.
(1994)Planetary waves are known to play an important role in determining the annual variability in the severity of Antarctic ozone depletion. In this thesis, data obtained from the TOMS experiment on board the Nimbus-7 satellite ... -
Plasmon as a mechanism to improve performance of bulk-heterojunction organic solar cells.
(2022)Narrow optical absorption band of fullerene based organic photovoltaics (OPVs) is one of the challenges to produce efficient polymer based solar panels that compete with inorganic counter part. There have been efforts ... -
The polycyclic aromatic hydrocarbon content and mutagenicity of the residue from cane burning and vehicle emissions.
(1992)Polycyclic (or polynuclear) aromatic hydrocarbons (PAHs) are environmental pollutants produced during the incomplete combustion of organic matter. Since many of these compounds have been shown to be mutagenic and/or ... -
The potential of plant polyphenols as natural photostable sunscreen active ingredients.
(2022)Protection from the sun dates to prehistoric times as a measure against the deleterious effects of solar ultraviolet (UV) radiation. Overexposure to this harmful UV radiation is a leading cause of pathological changes of ... -
A powder diffraction study of problems in platinum group metal extraction.
(1994)The base metal and platinum group metal extractive processes for two South African refineries were examined using x-ray powder diffraction. Base metal refinery matte contained nickel sulphide (Ni3S2), copper sulphide ... -
The preferential oxidation of CO nickel oxide catalysts and the doping effects of platinum in hydrogen rich streams.
(2012)Hydrogen has now become a suitable candidate for alternative energy generation for small scale applications with the aid of fuel cells. On-board production of hydrogen from methane is the most preferred method via a ... -
Preparation and characterization of organic solar cell.
(2013)Organic molecules based photovoltaic cells were fabricated in an open laboratory conditions without the use of glove box or clean room. Conducting polymers such as P3HT and PCBM were used as a photo-active layer of ... -
Probing the conceptions and mental models of students from diverse educational backgrounds in the context of a science centre show on sound.
(2016)Abstract available in PDF file. -
Production and high temperature treatment of syngas.
(2010)Gas cleaning is an essential step in many chemical processes. The reason for cleaning is to remove components that can damage equipment or inhibit further reactions. The treatment can include the removal of particulates, ... -
Profile analysis of X-ray powder diffraction data.
(1988)Various strategies have been tested for obtaining integrated intensities from x-ray powder diffractometer data. An asymmetric pseudo-Voigt profile function was used to fit the pattern in the region above 2θ = 35̊ (Cu-Kα ... -
Progress towards the pyrrolizidine alkaloid xenovenine (223H) via hydroamination.
(2016)Many natural products, pharmaceuticals and fine chemicals possess carbon-nitrogen bonds and thus the formation of such bonds is of great importance. Pyrrolizidine, indolizidine, quinolizidine and lehmizidine alkaloid ... -
Progress towards the stereoselective synthesis of cycleanine.
(2011)The emergence of multi-drug resistance (MDR) to antimalarial and anticancer drugs has stimulated a search for novel MDR inhibitors/reversers. Bisbenzylisoquinoline alkaloids (BBIQ) are potential agents for reversing MDR, ... -
Progress towards the stereoselective synthesis of Warburganal.
(1998)The aim of the project was to synthesize warburganal, a natural product isolated from the Warburgia plants native to Venda, known as a potent molluscicide, in a new, cheaper and more efficient way to be used in the ongoing ... -
Progress towards the synthesis of Indolizidine alkaloid 223AB
(2008)It has been shown that alkaloids from various sources are vital as lead compounds in medicinal research and thus also the efficient synthesis of these. With the goal of developing a general synthetic route that can potentially ...