Browsing Faculty of Natural Science by Title
Now showing items 2187-2206 of 2566
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Spatial distribution and abundance of microplastics particles in the bed sediment of Zeekoevlei Lake, Cape Town
(University of Western Cape, 2021)Microplastics (MPs) are an emerging micro-pollutant that pose a threat to the ecological integrity of freshwater rivers and wetlands. Most previous work on MPs pollution has focused on marine environments. This study aimed ... -
Spatial Distribution of the Population in South Africa: a statistical approach
(The University of the Western Cape, 2017)The purpose of the study was to examine the structural changes occurring in the patterns of spatial population distribution across South Africa over the period 1996-2016. The government in South Africa is perceived as being ... -
Spatial modelling of invasive species distribution in water-limited environments using remotely sensed data and climatic scenarios in the Heuningnes catchment, South Africa
(University of Western Cape, 2020)The occurrence and spread of Invasive Alien Plants (IAPs) is a threat to global water resources and natural ecosystems due to high water use rates. With the current climate change projections and their ability to survive ... -
A spatial-temporal conceptualization of groundwater flow distribution in a granite fractured rock aquifer within the southern supersite research catchment of the Kruger National Park
(University of the Western Cape, 2014)Understanding the hydrogeology of fractured or crystalline rocks is complicated because of complex structure and a porosity that is almost exclusively secondary. These types of geologies exhibit strong heterogeneities and ... -
Spatio-temporal dynamics in land use and habit fragmentation in Sandveld, South Africa
(University of the Western Cape, 2010)This research assessed landuse changes and trends in vegetation cover in the Sandveld, using remote sensing images. Landsat TM satellite images of 1990, 2004 and 2007 were classified using the maximum likelihood classifier ... -
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 ... -
Species delimitation and assessment of genetic variability in Carpobrotus (Aizoaceae): evidence from amplified fragment length polymorphisms
(University of the Western Cape, 2004)During the course of this thesis, AFLP technique was successfully applied to the Aizoaceae taxa. This study involved a substantial component of laboratory work including generating and analysing AFLP data, the operation ... -
Species recognition and reproductive isolation in Malawi cichlid fishes, Metriaclima estherae and M. callainos (Teleostei: Cichlidae)
(University of the Western Cape, 2019)Cichlids are one of the most diverse groups of fishes in the world. The highest concentration of cichlids is found in Lake Malawi, where over 1500 species are recorded to occur, which are dominated by the haplochromine ... -
Species-level phylogenetic reconstruction of the African cycad genus Encephalartos (Zamiaceae)
(University of the Western Cape, 2007)This thesis explores species-level phylogenetic relationships of the African cycad genus Encephalartos, which is one of the eleven genera of cycads. The genus is confined to Africa and comprises approximately 65 species, ... -
Spectrally selective AlXOY/Pt/AlXOY solar absorber coatings for high temprature solar-thermal applications
(University of Western Cape, 2014)The limited supply of fossil hydrocarbon resources and the negative impact of CO2 emission on the global environment dictate the increasing usage of renewable energy sources. Concentrating solar power (CSP) systems are the ... -
Spectres of the untold: memory and history in South Africa after the truth and reconciliation commission
(2006)This work is a meditation on the shaping of time and its impact on living with and understanding atrocity in South Africa in the wake of the Truth and Reconciliation Commission (TRC). -
Spectroelectrochemical determination of the antioxidant properties of carpobrotus mellei and carpobrotus quadrifidus natural products
(2009)South African Carpobrotus species have been found to contain hydrolysable tannins,various flavonoids e.g. rutin and hyperoside, phytosterols and aromatic acids which have a diverse range of pharmacological properties ... -
Spectroelectrochemical determination of the antioxidant properties of carpobrotus mellei and carpobrotus quadrifidus natural products
(University of the Western Cape, 2009)South African Carpobrotus species have been found to contain hydrolysable tannins, various tlavonoids e.g. rutin and hyperoside, phytosterols and aromatic acids which have a diverse range of pharmacological properties ... -
Spectroelectrochemical graphene-silver/zinc oxide nanoparticulate phenotype biosensors for ethambutol and pyrazinamide
(University of the Western Cape, 2019)Tuberculosis (TB), a deadly disease second to HIV/AIDS, is a global health problem. Diagnosis of active tuberculosis is tedious and requires expensive procedures since there is no recognizable method for sole detection ... -
Spectroscopy of proton unbound states in 32Cl
(University of the Western Cape, 2019)This project aimed to investigate proton unbound states in 32Cl using the 32S(3He; t) charge-exchange reaction. This research is relevant both in the context of nuclear structure and astrophysics. Excited states in 32Cl ... -
Sperm function in different human sperm subpopulations
(University of the Western Cape, 2022)Human semen contains a heterogenous population of spermatozoa of which only a certain fraction is physiologically suitable for fertilization. Functional characteristics of these subpopulations and sperm separation ... -
Sperm mitochondria: species specificity and relationships to sperm morphometric features and sperm function in selected mammalian species
(University of the Western Cape, 2011)Numerous studies on mammalian spermatozoa have reported large variations in the dimensions of the main sperm structural components, namely the head, midpiece and flagellum. These variations in sperm architecture are believed ... -
Sperm structure and quantitative sperm motality analysis of three wild antelope species: Aepyceros melampus, Damaliscus dorcas phillipus and Connocheates taurinus
(University of the Western Cape, 2001)The aim of this study was to compare sperm morphology, motility and the effects of cold treatment on Sperm of three wild antelope species', Aepyceros melampus (impala), Connochaetes taurinus (blue wildebeest) and Damaliscus ... -
Spin and parity assignment in 152 Gd investigating octupole structures
(University of Western Cape, 2008)The high-spin states of the nucleus 152Gd have been populated via the 152Sm (α, 4n) 152Gd fusion-evaporation reaction at a beam energy of 45MeV. The emitted γ rays were observed with the AFRODITE spectrometer array. The ... -
Spin and parity assignment in 152gd investigating octupole structures
(University of the Western Cape, 2008)Spin and parity assignment in 152gd investigating octupole structures The high-spin states of the nucleus ls2cd have been populated via the ls2sm (cr, 4n) 152Gd fusion-evaporation reaction at abeam energy of 45MeV. The ...