Faculty of Natural Science: Recent submissions
Now showing items 181-200 of 2566
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Development and implementation of ontology-based systems for mammalian gene expression profiling
(University of the Western Cape, 2009)The use of ontologies in the mapping of gene expression events provides an effective and comparable method to determine the expression profile of an entire genome across a large collection of experiments derived from ... -
Towards a chereme based dynamic South African sign language gesture recognition system
(University of the Western Cape, 2007)Hand gestures are a natural and intuitive way of human to human communication. Motivated by the achievements made towards automatic speech recognition, and by the ease with which people sign, many researchers started ... -
The evaluation of microwave drying on the polymorphic characteristics of carbamazepine granules prepared by the wet granulation process.
(Univeraity of the Western Cape, 2006)The drying conditions of granules for tabletting prepared by the wet granulation process traditionally involve conduction, convection and radiation heat transfer. Despite various technological advances utilizing combinations ... -
Character tables of some groups of extension type
(University of the Western Cape, 2002)The main aim of this mini-thesis is to give a description of some of the basic methods and techniques that have been developed to calculate the character tables of groups of extension type. We restrict our attention to ... -
Block Toeplitz operators with rational symbols and discrete singular systems
(University of the Western Cape, 2001)This thesis concerns block Toeplitz operators (equations). Consider the block Toeplitz operator T = [<I> k-j ]k,j=O' where the <I>k are complex m x m matrices such that 00 (0.1) v=-oo The norm in (0.1) is the usual ... -
Pre-equilibrium cross section calculations with a realistic effective nucleon-nucleon interaction
(University of the Western Cape, 1995)The principle aim of this work is to improve the way in which pre-equilibrium double differential cross-sections are currently calculated [1, 2, 3, 4]. The theoretical basis for these calculations is the Multistep Direct ... -
An exploration of the electrophysiological properties and ion transport across the isolated perfused seminiferous tubule of the rat
(UWC, 1999)A knowledge ofthe transport of ions is fundamental to the understanding ofthe 'bloodtestis' barrier and the transport of fluid across the seminiferous tubule. This is the first study that has investigated the isolated ... -
The synthesis, characterization and reactivity of some mononuclear hydrocarbyl compounds of iron
(University of the Western Cape, 1997)Mononuclear hydrocarbyl compounds of the type LnM(CH2)nCH:CH2 (L"M : Cp*Fe(CO)2 and CpFe(CO)2, n: 2-4,6), Cp(CO)zFe(CH2)nOH (n : 4-6,8) and Cp*(CO)2Fe(CH2)+OH have been synthesized. All these compounds have been l3 fully ... -
An approach to groundwater targeting in the Springbok region, Central Namaqualand, Northern Cape Province, South Africa
(University of the Western Cape, 2003)Namaqualand is a semi-arid region where water is not only a necessity and basic need but also very much a luxury. As a consequence, various studies were undertaken to find water sources, whether surface or groundwater, (by ... -
Pyramlyl palladium(Il) complexes as phenylacetylene oligomerization and polymerization catalysts'
(University of the Western Cape, 2004)PyrazoM compounds have been extensively used to prepare metal complexes, but it is only recently that they have been investigated as catalysts for the polymerization of unsaturated hydrocarbons. In catalyzn11g the ... -
(p.n.) Reactions on 59co in the intermediate energy range
(University of the Western Cape, 1992)Detailed theoretical investigations [Chi80,Mos82,Kle85] of (p,n) and (p,p') data indicate that the reaction mechanisms operative at intermediate energies and for energy losses up to several tens of MeV are predominantly ... -
Calibration of germanium detectors for applications of radiometric methods in South Africa.
(University of the Western Cape, 2001)AII materials that are radioactive emit characteristic gamma-radiation. Natural radioactivity can be used in heavy minerals exploration and processing, as well as in understanding sediment transport. processes in coastal ... -
Groundwater quality monitoring : An approach to groundwater resource quality protection
(University of the Western Cape, 2002)Resource protection is considered by the National Water Act (Act No. 36, 1998) of South Africa as one of the methods that can lead to resource management. Furthermore, the Water Services Act (Act No. 108, 1997) regards ... -
Specias delimitation and assessment of genetic variability in Carpobrotus (Alzoaceae): evidence from amplified fragment length polymorphisms
(University of the Western Cape, 2004)Species of Carpobrotus (Aizoaceae: Ruschioideae) are widely spread throughout South Africa and are commonly used for their medicinal properties. The genus consists of 13 species of which seven occur in South Africa, five ... -
Investigation of stains existing on fossil samples from the sterkfonfein archeaologica sites
(University of the Western Cape, 2006)It is known that fossilized bone samples excavated from the Sterkfontein archaeological sites have prominent brown stains on their surfaces. Their existence has been postulated by researchers from Transvaal museum to be ... -
The effects of Elytropappus rhinocerotis Cass and Pelargonium triste (L.) L'Hèrit on animal health and metabolism
(University of the Western Cape, 2003)Many South Africans use cultural traditions and practices in the management of their health. Elytropappus rhinocerotis is an important medicinal plant, which is widely distributed in regions of South Africa. The objective ... -
Search for tetrahedral bands in yb isotopes
(University of the Western Cape, 2007)Calculations by Dudek et al. predict shell gaps for tetrahedrally shaped nuclei at various proton and neutron numbers. 160Yb is expected to be a favourable nucleus, with tetrahedral bands predicted to lie 1 MeV above the ... -
Identification and partial characterisation of a putative novel plant stress response gene from Arabidopsis thaliana.
(University of the Western Cape, 2000)Exposure of plants to stress results in the expression of plant genes whose products play a role in defence responses against the stress. Stress stimuli to which plants may be exposed are wounding, drought, salinity, ... -
Genome-wide identification and comprehensive analysis of transcriptionsl desert regions
(University of the Western Cape, 2009)The initiation of transcription in mammalian genomes predominatly occurs at 5' promoter regions, however increasingly initiation events have been observed within introns, coding exons and 3' UTRs. Nevertheless there ... -
The determination of diffracted wave fields by an annulus according to Braunbek’s method
(University of the Western Cape, 1981)In this thesis a short wave approximation, the method oI W Braunbek, is used to determine the diffracted fields (acoustic and electromagnetic) of plane harmonic waves by an annular aperture. Integral representations ...