Stratigraphy, geochemistry and origin of the manganese ore deposit in Carletonville, North West province of South Africa
- Authors: Pharoe, Benedict Kinshasa
- Date: 2015
- Subjects: Geology, Stratigraphic Geology--South Africa Geochemistry--South Africa
- Language: English
- Type: Thesis , Masters , Geology
- Identifier: http://hdl.handle.net/10353/11641 , vital:39092
- Description: The Carletonville manganese ore-deposit is a Neogene weathered nodule deposit which was developed on the Early Proterozoic Malmani dolomite succession of the Transvaal Supergroup in Carletonville area, North-West Province, South Africa. The deposits were formed from surficial weathering of the underlying Mn-rich dolomites of the Malmani Subgroup and some were formed from weathered Mn-rich Tertiary alluvial-fluvial sediments. These deposits are currently mineralized and hosted in modern Mn-Fe rich soil profiles and occurs at shallow depths, thus the ore is suitable to be mined by open-cast mining. The study dealt with the stratigraphy, petrology, geochemistry, diagenesis and origin of the ore-deposit. The stratigraphic profile of the manganese ore-deposit was subdivided into 8 zones, namely the (A, B, C, D, E, F, G, and H) zones from the surface downwards. On the basis of variation in mineralogical and chemical composition, nodule grain sizes and the zonation colour, the above mentioned zones were further integrated into the Upper (A and B), Middle (C, D and E) and Lower (F, G and H) Zone, with the I zone, the basement zone, representing the underlying Malmani Subgroup stromatolitic dolomite. The Upper Zone represents organic rich, fine grain silty soil which caps the stratigraphic succession in the mine area. Mineralogically, these zones are depleted in manganese and comprises of hematite, kaolinite, micas and quartz grains, with Mn-Fe coated terrigenous clasts concentrated at the lowermost portion of the B-zone along the contact with the underlying zones. The Middle Zone is characteristically medium to fine in grain sizes with reddish colour due to intense weathering of iron minerals to hematite and is depleted in Ca, Na and Mg bearing minerals as a result of dissolution and leaching and is highly concentrated in quartz and caliche fragments. The Lower Zone is coarse grained with dark, reddish-brown colour. The Middle and Lower Zones comprise mainly of Mn and Fe oxides, clays, quartz, limonite, micas and caliche patches. The concentration of manganese is, however, not consistent in these zones from one borehole to the next, it deviates with topography and depth. The overall stratigraphic succession in the mine area can be described as characterizing of basal stromatolitic dolomite of the Malmani Subgroup, overlain by zone of black, powder-like manganiferous wad which is in turn overlain by weathered Mn-rich Tertiary alluvial-fluvial sediments hosting manganiferous nodules. The whole succession is covered by Quaternary sands. The studies undertaken on grain size analysis for the determination of variation in nodule grain sizes with increasing depth along the profile has indicated a perfect variation trend in grain sizes, where the underlying Lower Zone characterizes of coarse grain fraction whilst the overlying Middle Zone is mainly medium to fine grained and the Upper Zone comprise of very fine silt soil. Statistical parameters were used to classify these sediments under Udden-Wentworth grain size classification scheme. Based on these parameters the samples were classified as pebbles and/or gravel on GRADISTAT program and were found to be moderately to poorly sorted, positively skewed with moderate kurtosis and displays a bimodal distribution. Mineralogical analysis with X-Ray Diffraction and petrographic studies indicates that cryptomelane (KMn8 O16) is the major manganese mineral, whereas pyrolusite occurs as a minor manganese mineral in the mine. Other mineral constituents include hematite/goethite, clay minerals, muscovite, quartz, calcite, limonite with minor amount of heavy minerals. The modal composition studies carried out on the terrigenous clasts which are coated on surface by Mn-Fe oxide concentric laminae indicated their nature to be sub-arkoses and quartz arenites. These clasts are found to occur in association with manganiferous nodules in the mine area, with high concentration experienced at the uppermost portion of the profile below the top soil. The provenance studies indicates the source of these terrigenous sediments from cratonic interior to recycle orogen at low plains with a temperate and subhumid climate and on tropical, humid conditions within an area of moderate to low relief. Based on the geochemical studies, different manganese classification schemes were adopted in this study and inferences were made from geochemical data which indicated supergene and hydrogenous source of the Carletonville manganese nodules suggesting precipitation from weathering residues of Malmani dolomite at passive continental margin of tectonic provenance, with temperate and tropical to humid climatic conditions. The diagenetic features were broadly divided into early, mid and uplift diagenetic stage. Early stage includes sediment consolidation which characterized of cementation and neomorphism in carbonate sediments. This period was followed by mid (burial diagenesis) stage which brought about an increase in tightness of grain packing, loss of pore spaces and thinning of beds due to weight of overlying sediments and selective dissolution of framework grains. Mineral dissolution and replacement were common factors during this stage. In the last diagenetic stage, rocks were uplifted, weathered and unroofed by erosion bringing mineral assemblage including newly formed diagenetic minerals into environment of low temperature and pressure, and high oxygen environment.
- Full Text:
- Date Issued: 2015
- Authors: Pharoe, Benedict Kinshasa
- Date: 2015
- Subjects: Geology, Stratigraphic Geology--South Africa Geochemistry--South Africa
- Language: English
- Type: Thesis , Masters , Geology
- Identifier: http://hdl.handle.net/10353/11641 , vital:39092
- Description: The Carletonville manganese ore-deposit is a Neogene weathered nodule deposit which was developed on the Early Proterozoic Malmani dolomite succession of the Transvaal Supergroup in Carletonville area, North-West Province, South Africa. The deposits were formed from surficial weathering of the underlying Mn-rich dolomites of the Malmani Subgroup and some were formed from weathered Mn-rich Tertiary alluvial-fluvial sediments. These deposits are currently mineralized and hosted in modern Mn-Fe rich soil profiles and occurs at shallow depths, thus the ore is suitable to be mined by open-cast mining. The study dealt with the stratigraphy, petrology, geochemistry, diagenesis and origin of the ore-deposit. The stratigraphic profile of the manganese ore-deposit was subdivided into 8 zones, namely the (A, B, C, D, E, F, G, and H) zones from the surface downwards. On the basis of variation in mineralogical and chemical composition, nodule grain sizes and the zonation colour, the above mentioned zones were further integrated into the Upper (A and B), Middle (C, D and E) and Lower (F, G and H) Zone, with the I zone, the basement zone, representing the underlying Malmani Subgroup stromatolitic dolomite. The Upper Zone represents organic rich, fine grain silty soil which caps the stratigraphic succession in the mine area. Mineralogically, these zones are depleted in manganese and comprises of hematite, kaolinite, micas and quartz grains, with Mn-Fe coated terrigenous clasts concentrated at the lowermost portion of the B-zone along the contact with the underlying zones. The Middle Zone is characteristically medium to fine in grain sizes with reddish colour due to intense weathering of iron minerals to hematite and is depleted in Ca, Na and Mg bearing minerals as a result of dissolution and leaching and is highly concentrated in quartz and caliche fragments. The Lower Zone is coarse grained with dark, reddish-brown colour. The Middle and Lower Zones comprise mainly of Mn and Fe oxides, clays, quartz, limonite, micas and caliche patches. The concentration of manganese is, however, not consistent in these zones from one borehole to the next, it deviates with topography and depth. The overall stratigraphic succession in the mine area can be described as characterizing of basal stromatolitic dolomite of the Malmani Subgroup, overlain by zone of black, powder-like manganiferous wad which is in turn overlain by weathered Mn-rich Tertiary alluvial-fluvial sediments hosting manganiferous nodules. The whole succession is covered by Quaternary sands. The studies undertaken on grain size analysis for the determination of variation in nodule grain sizes with increasing depth along the profile has indicated a perfect variation trend in grain sizes, where the underlying Lower Zone characterizes of coarse grain fraction whilst the overlying Middle Zone is mainly medium to fine grained and the Upper Zone comprise of very fine silt soil. Statistical parameters were used to classify these sediments under Udden-Wentworth grain size classification scheme. Based on these parameters the samples were classified as pebbles and/or gravel on GRADISTAT program and were found to be moderately to poorly sorted, positively skewed with moderate kurtosis and displays a bimodal distribution. Mineralogical analysis with X-Ray Diffraction and petrographic studies indicates that cryptomelane (KMn8 O16) is the major manganese mineral, whereas pyrolusite occurs as a minor manganese mineral in the mine. Other mineral constituents include hematite/goethite, clay minerals, muscovite, quartz, calcite, limonite with minor amount of heavy minerals. The modal composition studies carried out on the terrigenous clasts which are coated on surface by Mn-Fe oxide concentric laminae indicated their nature to be sub-arkoses and quartz arenites. These clasts are found to occur in association with manganiferous nodules in the mine area, with high concentration experienced at the uppermost portion of the profile below the top soil. The provenance studies indicates the source of these terrigenous sediments from cratonic interior to recycle orogen at low plains with a temperate and subhumid climate and on tropical, humid conditions within an area of moderate to low relief. Based on the geochemical studies, different manganese classification schemes were adopted in this study and inferences were made from geochemical data which indicated supergene and hydrogenous source of the Carletonville manganese nodules suggesting precipitation from weathering residues of Malmani dolomite at passive continental margin of tectonic provenance, with temperate and tropical to humid climatic conditions. The diagenetic features were broadly divided into early, mid and uplift diagenetic stage. Early stage includes sediment consolidation which characterized of cementation and neomorphism in carbonate sediments. This period was followed by mid (burial diagenesis) stage which brought about an increase in tightness of grain packing, loss of pore spaces and thinning of beds due to weight of overlying sediments and selective dissolution of framework grains. Mineral dissolution and replacement were common factors during this stage. In the last diagenetic stage, rocks were uplifted, weathered and unroofed by erosion bringing mineral assemblage including newly formed diagenetic minerals into environment of low temperature and pressure, and high oxygen environment.
- Full Text:
- Date Issued: 2015
Structural and optical properties of alloyed quaternary CdSeTeS core and CdSeTeS/ZnS core–shell quantum dots
- Adegoke, Oluwasesan, Nyokong, Tebello, Forbes, Patricia B C
- Authors: Adegoke, Oluwasesan , Nyokong, Tebello , Forbes, Patricia B C
- Date: 2015
- Language: English
- Type: Article
- Identifier: vital:7244 , http://hdl.handle.net/10962/d1020248
- Description: Synthesis of fluorescent alloyed quantum dots (QDs) with unique optical properties suitable for a wide array of chemical, physical and biological applications is of research interest. In this work, highly luminescent and photostable alloyed quaternary CdSeTeS core QDs of two different sizes were fabricated via the organometallic hot-injection synthetic route. Characterization of the nanocrystals were performed using TEM, XRD, UV/vis and fluorescence spectrophotometric techniques. We have demonstrated in this work that the well fabricated alloyed quaternary CdSeTeS core QDs possess unique optical properties that are advantageous over conventional core/shell systems. Formation of the CdSeTeS/ZnS core/shell with the desired optical properties comes with a number of challenges, hence the advantages of the quaternary alloyed core over the core/shell QDs are (i) avoidance of the challenging process of determining the proper shell thickness which can provide the desired optical properties in the core/shell system and (ii) avoidance of the lattice-induced mismatch between the core and the shell material which can either lead to incomplete exciton confinement or dislocation at the core/shell interface. , Original publication is available at http://dx.doi.org/10.1016/j.jallcom.2015.05.083
- Full Text: false
- Date Issued: 2015
- Authors: Adegoke, Oluwasesan , Nyokong, Tebello , Forbes, Patricia B C
- Date: 2015
- Language: English
- Type: Article
- Identifier: vital:7244 , http://hdl.handle.net/10962/d1020248
- Description: Synthesis of fluorescent alloyed quantum dots (QDs) with unique optical properties suitable for a wide array of chemical, physical and biological applications is of research interest. In this work, highly luminescent and photostable alloyed quaternary CdSeTeS core QDs of two different sizes were fabricated via the organometallic hot-injection synthetic route. Characterization of the nanocrystals were performed using TEM, XRD, UV/vis and fluorescence spectrophotometric techniques. We have demonstrated in this work that the well fabricated alloyed quaternary CdSeTeS core QDs possess unique optical properties that are advantageous over conventional core/shell systems. Formation of the CdSeTeS/ZnS core/shell with the desired optical properties comes with a number of challenges, hence the advantages of the quaternary alloyed core over the core/shell QDs are (i) avoidance of the challenging process of determining the proper shell thickness which can provide the desired optical properties in the core/shell system and (ii) avoidance of the lattice-induced mismatch between the core and the shell material which can either lead to incomplete exciton confinement or dislocation at the core/shell interface. , Original publication is available at http://dx.doi.org/10.1016/j.jallcom.2015.05.083
- Full Text: false
- Date Issued: 2015
Structural and optical properties of alloyed quaternary CdSeTeS core and CdSeTeS/ZnS core–shell quantum dots
- Adegoke, Oluwasesan, Nyokong, Tebello, Forbes, Patricia B C
- Authors: Adegoke, Oluwasesan , Nyokong, Tebello , Forbes, Patricia B C
- Date: 2015
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/193575 , vital:45349 , xlink:href="https://doi.org/10.1016/j.jallcom.2015.05.083"
- Description: Synthesis of fluorescent alloyed quantum dots (QDs) with unique optical properties suitable for a wide array of chemical, physical and biological applications is of research interest. In this work, highly luminescent and photostable alloyed quaternary CdSeTeS core QDs of two different sizes were fabricated via the organometallic hot-injection synthetic route. Characterization of the nanocrystals were performed using TEM, XRD, UV/vis and fluorescence spectrophotometric techniques. We have demonstrated in this work that the well fabricated alloyed quaternary CdSeTeS core QDs possess unique optical properties that are advantageous over conventional core/shell systems. Formation of the CdSeTeS/ZnS core/shell with the desired optical properties comes with a number of challenges, hence the advantages of the quaternary alloyed core over the core/shell QDs are (i) avoidance of the challenging process of determining the proper shell thickness which can provide the desired optical properties in the core/shell system and (ii) avoidance of the lattice-induced mismatch between the core and the shell material which can either lead to incomplete exciton confinement or dislocation at the core/shell interface.
- Full Text:
- Date Issued: 2015
- Authors: Adegoke, Oluwasesan , Nyokong, Tebello , Forbes, Patricia B C
- Date: 2015
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/193575 , vital:45349 , xlink:href="https://doi.org/10.1016/j.jallcom.2015.05.083"
- Description: Synthesis of fluorescent alloyed quantum dots (QDs) with unique optical properties suitable for a wide array of chemical, physical and biological applications is of research interest. In this work, highly luminescent and photostable alloyed quaternary CdSeTeS core QDs of two different sizes were fabricated via the organometallic hot-injection synthetic route. Characterization of the nanocrystals were performed using TEM, XRD, UV/vis and fluorescence spectrophotometric techniques. We have demonstrated in this work that the well fabricated alloyed quaternary CdSeTeS core QDs possess unique optical properties that are advantageous over conventional core/shell systems. Formation of the CdSeTeS/ZnS core/shell with the desired optical properties comes with a number of challenges, hence the advantages of the quaternary alloyed core over the core/shell QDs are (i) avoidance of the challenging process of determining the proper shell thickness which can provide the desired optical properties in the core/shell system and (ii) avoidance of the lattice-induced mismatch between the core and the shell material which can either lead to incomplete exciton confinement or dislocation at the core/shell interface.
- Full Text:
- Date Issued: 2015
Structural assessment of the Koulekoun Gold Deposit, Guinea, West Africa
- Authors: Dopavogui, Joseph Siba
- Date: 2015
- Subjects: Avocet Mining PLC , Gold ores -- Geology -- Guinea -- Siguiri (Region) , Mines and mineral resources -- Guinea -- Siguiri (Region) , Mineralogy -- Guinea -- Siguiri (Region) , Spherical projection , Faults (Geology) -- Guinea -- Siguiri (Region) , Sedimentary rocks -- Guinea -- Siguiri (Region)
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5084 , http://hdl.handle.net/10962/d1018201
- Description: The Koulekoun Gold project is the most important prospect of Avocet Mining plc. It is one of the projects within the TriK-block in Guinea (West Africa) for which an exploration permit has been granted. The Koulekoun deposit is located within the Siguiri basin of Birimian age in the Eastern Guinea region; where most Guinea’s gold mines are situated. The present study involves the investigation of structural elements (S₀, S₁, S₂, intrusive contacts, faults and veins) from selected drill cores from drill sections that intersect the Koulekoun orebody in four parts of the deposit; characterizes the principal orientations of measured structures and determines their relationships using stereonet; in order to predict important intersections to focus on in exploration programs within the TriK-block and suggests a possible structural model of the Koulekoun deposit. Raw data used for the present research was collected from half-core samples due to the absence of surface outcrop from which direct measurements could have been made. Measured data were interpreted using stereographic projection. Often no preferred orientations of structural elements exist in the area, suggesting a complex structural situation, particularly with regard to hydrothermal vein attitudes. Thus, it has been illustrated from structural data analysis and S₀ data 3d interpolation of the four sub-structural domains (North-East, North-West, Central and South) that NE-SW structures (S₂, intrusive contact, fault and vein) have controlled the occurrency of gold mineralization in the Koulekoun deposit area. Geometrical relationships between structure main cluster orientation from stereonet analysis show the majority of S₀ moderately E-dipping; intrusive contacts dip at moderate angle to the SE in all zones, except in the North-East zone where they are sub-vertical and SE-dipping. Fault planes show variable orientation of NE-SW, NW-SE and E-W, and steeply SE-dipping. Vein planes correspond to fault systems and show high variability in their orientation with numerous orders of vein direction in each domain. The cross-cutting relationships suggest two principal generations of faults: the NE-SW fault (F1) and the NW-SE fault (F2). These two fault systems and their associated vein intersection areas preferably define the ore shoot zones within the Koulekoun deposit. The proposed structural model of the Koulekoun deposit suggests the intersection and interference of major NW-SE and minor NE-SW structures. The interference of folds formed basin-dome structures with oval shape geometries striking NW-SE and that dominantly occur in North-East, North-West and Central zones. The South Zone is characterized by NE-SW gently plunging and moderately inclined folds with NW-SE striking axial surface. Gold mineralization occurs at the edges of basin-dome structures in North-East, North-West and Central zones. Mineralized porphyry intrusions are likely located within the axial surface of the South zone folds and extend toward the Central zone. The proposed model is compliant with the earlier model of the Koulekoun deposit presented by Tenova (2013); Fahey et al. (2013) describing the Koulekoun deposit as an auriferous NE-SW trending fault zone, intersecting a major NW-striking and steeply E-dipping porphyry units. The model also fits within the regional structural context suggested by Lahondere et al. (1999a) related to the E-W vein structures attributed to NW-SE fractures and to the conjugated fault of NE-SW direction. Comparatively to the three industrial gold deposits (Siguiri, Lero, Kiniero) being currently mined in the Siguiri Basin, and defined as mesothermal vein and lode mineralization hosted in Birimian meta-sedimentary rocks (Lalande, 2005), the Koulekoun gold deposit appears to be a porphyry hosted orogenic disseminated style mineralization system (Fahey et al., 2013). Although, similarities between the Koulekoun gold deposit and these three industrial deposits (Siguiri, Lero, Kiniero) constitute of the intensive extends of the weathering profile and at some stages, by the existence of numerous ring-shaped and curved lineaments enhanced by drag folding (Lero deposit for instance). It is therefore recommended that targets selection around the Koulekoun deposit and within the TriK-block for further exploration programs be concentrated along NW-SE structures, in objective to determine possible intersection zones with NE-SW structures.
- Full Text:
- Date Issued: 2015
- Authors: Dopavogui, Joseph Siba
- Date: 2015
- Subjects: Avocet Mining PLC , Gold ores -- Geology -- Guinea -- Siguiri (Region) , Mines and mineral resources -- Guinea -- Siguiri (Region) , Mineralogy -- Guinea -- Siguiri (Region) , Spherical projection , Faults (Geology) -- Guinea -- Siguiri (Region) , Sedimentary rocks -- Guinea -- Siguiri (Region)
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5084 , http://hdl.handle.net/10962/d1018201
- Description: The Koulekoun Gold project is the most important prospect of Avocet Mining plc. It is one of the projects within the TriK-block in Guinea (West Africa) for which an exploration permit has been granted. The Koulekoun deposit is located within the Siguiri basin of Birimian age in the Eastern Guinea region; where most Guinea’s gold mines are situated. The present study involves the investigation of structural elements (S₀, S₁, S₂, intrusive contacts, faults and veins) from selected drill cores from drill sections that intersect the Koulekoun orebody in four parts of the deposit; characterizes the principal orientations of measured structures and determines their relationships using stereonet; in order to predict important intersections to focus on in exploration programs within the TriK-block and suggests a possible structural model of the Koulekoun deposit. Raw data used for the present research was collected from half-core samples due to the absence of surface outcrop from which direct measurements could have been made. Measured data were interpreted using stereographic projection. Often no preferred orientations of structural elements exist in the area, suggesting a complex structural situation, particularly with regard to hydrothermal vein attitudes. Thus, it has been illustrated from structural data analysis and S₀ data 3d interpolation of the four sub-structural domains (North-East, North-West, Central and South) that NE-SW structures (S₂, intrusive contact, fault and vein) have controlled the occurrency of gold mineralization in the Koulekoun deposit area. Geometrical relationships between structure main cluster orientation from stereonet analysis show the majority of S₀ moderately E-dipping; intrusive contacts dip at moderate angle to the SE in all zones, except in the North-East zone where they are sub-vertical and SE-dipping. Fault planes show variable orientation of NE-SW, NW-SE and E-W, and steeply SE-dipping. Vein planes correspond to fault systems and show high variability in their orientation with numerous orders of vein direction in each domain. The cross-cutting relationships suggest two principal generations of faults: the NE-SW fault (F1) and the NW-SE fault (F2). These two fault systems and their associated vein intersection areas preferably define the ore shoot zones within the Koulekoun deposit. The proposed structural model of the Koulekoun deposit suggests the intersection and interference of major NW-SE and minor NE-SW structures. The interference of folds formed basin-dome structures with oval shape geometries striking NW-SE and that dominantly occur in North-East, North-West and Central zones. The South Zone is characterized by NE-SW gently plunging and moderately inclined folds with NW-SE striking axial surface. Gold mineralization occurs at the edges of basin-dome structures in North-East, North-West and Central zones. Mineralized porphyry intrusions are likely located within the axial surface of the South zone folds and extend toward the Central zone. The proposed model is compliant with the earlier model of the Koulekoun deposit presented by Tenova (2013); Fahey et al. (2013) describing the Koulekoun deposit as an auriferous NE-SW trending fault zone, intersecting a major NW-striking and steeply E-dipping porphyry units. The model also fits within the regional structural context suggested by Lahondere et al. (1999a) related to the E-W vein structures attributed to NW-SE fractures and to the conjugated fault of NE-SW direction. Comparatively to the three industrial gold deposits (Siguiri, Lero, Kiniero) being currently mined in the Siguiri Basin, and defined as mesothermal vein and lode mineralization hosted in Birimian meta-sedimentary rocks (Lalande, 2005), the Koulekoun gold deposit appears to be a porphyry hosted orogenic disseminated style mineralization system (Fahey et al., 2013). Although, similarities between the Koulekoun gold deposit and these three industrial deposits (Siguiri, Lero, Kiniero) constitute of the intensive extends of the weathering profile and at some stages, by the existence of numerous ring-shaped and curved lineaments enhanced by drag folding (Lero deposit for instance). It is therefore recommended that targets selection around the Koulekoun deposit and within the TriK-block for further exploration programs be concentrated along NW-SE structures, in objective to determine possible intersection zones with NE-SW structures.
- Full Text:
- Date Issued: 2015
Structural controls of gold mineralisation in Seguelen pit of Siguiri gold mine, Guinea
- Authors: Beavogui, Massa
- Date: 2015
- Subjects: AngloGold Ashanti Ltd. , Gold mines and mining -- Guinea -- Siguiri (Region) , Geochemical surveys -- Guinea -- Siguiri (Region) , Geology, Structural -- Guinea -- Siguiri (Region) , Faults (Geology) -- Guinea -- Siguiri (Region) , Folds (Geology) -- Guinea -- Siguiri (Region) , Turbidites -- Guinea -- Siguiri (Region) , Metamorphism (Geology) -- Guinea -- Siguiri (Region) , Hydrothermal alteration -- Guinea -- Siguiri (Region)
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5091 , http://hdl.handle.net/10962/d1019879
- Description: The present study provides the results of detailed mapping and analysis of structures encountered in Seguelen pit of Siguiri gold mine, Guinea, where the Siguiri mine is geo-tectonically located in the Baoulé-Mossi domain of Man Shield in West African craton. The gold deposit is hosted in low-grade metamorphic sediments of turbidites sequences which form part of the Lower Proterozoic of Birimian Super group. Three rock formations of Balato, Fatoya and Kintinian underlay the overall pits. The Siguiri gold mine is characterized by the deep weathering profile, developed over the rocks reaching 200 m below the surface in some areas and often capped by the lateritic gravel or duricrust. The rock formations at Seguelen area are characterised by strong bedding monotonously dipping towards SW and trending NW-SE. The lithology of the host rocks has strong control on the disseminated mineralisation throughout the deposit. Two domains of rock formations are clearly distinguished at Seguelen: Fatoya Formation(Ffm) domain ; and Kintinian Formation (Kfm) domain. The two domains are separated by a contact zone of 1.7 m wide parallel to bedding and characterised by the presence of quartz fragments as well as thinly sheeted shale and black shale. This contact zone is identified as disconformity. The major tectonic deformation which has affected the region is known as D2 corresponding to the Eburnean orogeny. The major D2 related structures is the regional thrust striking N-S over an area of 12 km long and 3 km wide and within which corridors all Siguiri gold Mine open pits are located. In the N-S trending structures, there is east-northeast shortening and north-northwest extension. There is pervasive hydrothermal alteration (carbonatization and sideritization) and supergene alteration in the all pits. The hydrothermal alteration attests the intensity of hydrothermal fluid-flow over the host rocks. The hydrothermal fluids flowed along the fractures and within the wall rocks through bedding plans to form numerous auriferous quartz veins bearing disseminated sulphides through chemical reaction between fluids and wall rocks, which are remarkable at Seguelen pit. Three quartz vein sets are distinguished at Seguelen: NNE-SSW quartz vein set NE-SW quartz vein set NW-SE quartz vein set The NE-SW and NNE-SSW quartz veins are often lenticular and associated with the bulk mineralisation.
- Full Text:
- Date Issued: 2015
- Authors: Beavogui, Massa
- Date: 2015
- Subjects: AngloGold Ashanti Ltd. , Gold mines and mining -- Guinea -- Siguiri (Region) , Geochemical surveys -- Guinea -- Siguiri (Region) , Geology, Structural -- Guinea -- Siguiri (Region) , Faults (Geology) -- Guinea -- Siguiri (Region) , Folds (Geology) -- Guinea -- Siguiri (Region) , Turbidites -- Guinea -- Siguiri (Region) , Metamorphism (Geology) -- Guinea -- Siguiri (Region) , Hydrothermal alteration -- Guinea -- Siguiri (Region)
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5091 , http://hdl.handle.net/10962/d1019879
- Description: The present study provides the results of detailed mapping and analysis of structures encountered in Seguelen pit of Siguiri gold mine, Guinea, where the Siguiri mine is geo-tectonically located in the Baoulé-Mossi domain of Man Shield in West African craton. The gold deposit is hosted in low-grade metamorphic sediments of turbidites sequences which form part of the Lower Proterozoic of Birimian Super group. Three rock formations of Balato, Fatoya and Kintinian underlay the overall pits. The Siguiri gold mine is characterized by the deep weathering profile, developed over the rocks reaching 200 m below the surface in some areas and often capped by the lateritic gravel or duricrust. The rock formations at Seguelen area are characterised by strong bedding monotonously dipping towards SW and trending NW-SE. The lithology of the host rocks has strong control on the disseminated mineralisation throughout the deposit. Two domains of rock formations are clearly distinguished at Seguelen: Fatoya Formation(Ffm) domain ; and Kintinian Formation (Kfm) domain. The two domains are separated by a contact zone of 1.7 m wide parallel to bedding and characterised by the presence of quartz fragments as well as thinly sheeted shale and black shale. This contact zone is identified as disconformity. The major tectonic deformation which has affected the region is known as D2 corresponding to the Eburnean orogeny. The major D2 related structures is the regional thrust striking N-S over an area of 12 km long and 3 km wide and within which corridors all Siguiri gold Mine open pits are located. In the N-S trending structures, there is east-northeast shortening and north-northwest extension. There is pervasive hydrothermal alteration (carbonatization and sideritization) and supergene alteration in the all pits. The hydrothermal alteration attests the intensity of hydrothermal fluid-flow over the host rocks. The hydrothermal fluids flowed along the fractures and within the wall rocks through bedding plans to form numerous auriferous quartz veins bearing disseminated sulphides through chemical reaction between fluids and wall rocks, which are remarkable at Seguelen pit. Three quartz vein sets are distinguished at Seguelen: NNE-SSW quartz vein set NE-SW quartz vein set NW-SE quartz vein set The NE-SW and NNE-SSW quartz veins are often lenticular and associated with the bulk mineralisation.
- Full Text:
- Date Issued: 2015
Structural studies on yeast eIF5A using biomolecular NMR and molecular dynamics
- Authors: Sigauke, Lester Takunda
- Date: 2015
- Subjects: Molecular dynamics , Reverse transcriptase , HIV (Viruses) , HIV infections , Eukaryotic cells , Yeast
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4547 , http://hdl.handle.net/10962/d1017927
- Description: Eukaryotic initiation factor 5A, eIF5A, is a ubiquitous eukaryotic protein that has been shown to influence the translation initiation of a specific subset of mRNAs. It is the only protein known to undergo hypusination in a two-step post translational modification process involving deoxyhypusine synthase (DHS) and deoxyhypusine hydroxylase (DOHH) enzymes. Hypusination has been shown to influence translation of HIV-1 and HTLV-1 nuclear export signals, while the involvement of active hypusinated eIF5A in induction of IRES mediated processes that initiate pro-apoptotic process have inspired studies into the manipulation of eIF5A in anti-cancer and anti-diabetic therapies. eIF5A oligomerisation in eukaryotic systems has been shown to be influenced by hypusination and the mechanism of dimerisation is RNA dependent. Nuclear magnetic resonance spectroscopy approaches were proposed to solve the structure of the hypusinated eIF5A in solution in order to understand the influence of hypusination on the monomeric arrangement which enhances dimerisation and activates the protein. Cleavage of the 18 kDa protein monomer by introduction of thrombin cleavage site within the flexible domain was thought to give rise to 10 kDa fragments accessible to a 600 MHz NMR spectrometer. Heteronuclear single quantum correlation experiments of the mutated isotopically labelled protein expressed in E. coli showed that the eIF5A protein with a thrombin cleavage insert, eIF5AThr (eIF5A subscript Thr), was unfolded. In silico investigations of the behaviour of eIF5A and eIF5AThr (eIF5A subscript Thr) models in solution using molecular dynamics showed that the mutated model had different solution dynamics to the native model. Chemical shift predictors were used to extract atomic resolution data of solution dynamics and the introduction of rigidity in the flexible loop region of eIF5A affected solution behaviour consistent with lack of in vivo function of eIF5AThr (eIF5A subscript Thr) in yeast. Residual dipolar coupling and T₁ relaxation times were calculated in anticipation of the extraction of experimental data from RDC and relaxation dispersion experiments based on HSQC measurable restraints.
- Full Text:
- Date Issued: 2015
- Authors: Sigauke, Lester Takunda
- Date: 2015
- Subjects: Molecular dynamics , Reverse transcriptase , HIV (Viruses) , HIV infections , Eukaryotic cells , Yeast
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4547 , http://hdl.handle.net/10962/d1017927
- Description: Eukaryotic initiation factor 5A, eIF5A, is a ubiquitous eukaryotic protein that has been shown to influence the translation initiation of a specific subset of mRNAs. It is the only protein known to undergo hypusination in a two-step post translational modification process involving deoxyhypusine synthase (DHS) and deoxyhypusine hydroxylase (DOHH) enzymes. Hypusination has been shown to influence translation of HIV-1 and HTLV-1 nuclear export signals, while the involvement of active hypusinated eIF5A in induction of IRES mediated processes that initiate pro-apoptotic process have inspired studies into the manipulation of eIF5A in anti-cancer and anti-diabetic therapies. eIF5A oligomerisation in eukaryotic systems has been shown to be influenced by hypusination and the mechanism of dimerisation is RNA dependent. Nuclear magnetic resonance spectroscopy approaches were proposed to solve the structure of the hypusinated eIF5A in solution in order to understand the influence of hypusination on the monomeric arrangement which enhances dimerisation and activates the protein. Cleavage of the 18 kDa protein monomer by introduction of thrombin cleavage site within the flexible domain was thought to give rise to 10 kDa fragments accessible to a 600 MHz NMR spectrometer. Heteronuclear single quantum correlation experiments of the mutated isotopically labelled protein expressed in E. coli showed that the eIF5A protein with a thrombin cleavage insert, eIF5AThr (eIF5A subscript Thr), was unfolded. In silico investigations of the behaviour of eIF5A and eIF5AThr (eIF5A subscript Thr) models in solution using molecular dynamics showed that the mutated model had different solution dynamics to the native model. Chemical shift predictors were used to extract atomic resolution data of solution dynamics and the introduction of rigidity in the flexible loop region of eIF5A affected solution behaviour consistent with lack of in vivo function of eIF5AThr (eIF5A subscript Thr) in yeast. Residual dipolar coupling and T₁ relaxation times were calculated in anticipation of the extraction of experimental data from RDC and relaxation dispersion experiments based on HSQC measurable restraints.
- Full Text:
- Date Issued: 2015
Structure of the nucleus ¹¹⁴Sn using gamma-ray coincidence data
- Authors: Oates, Sean Benjamin
- Date: 2015
- Subjects: High spin physics , Nuclear structure , Nuclear shell theory , Neutron counters , Decay schemes (Radioactivity) , Coincidence circuits , Collective excitations , Anisotropy
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5562 , http://hdl.handle.net/10962/d1019870
- Full Text:
- Date Issued: 2015
- Authors: Oates, Sean Benjamin
- Date: 2015
- Subjects: High spin physics , Nuclear structure , Nuclear shell theory , Neutron counters , Decay schemes (Radioactivity) , Coincidence circuits , Collective excitations , Anisotropy
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5562 , http://hdl.handle.net/10962/d1019870
- Full Text:
- Date Issued: 2015
Studies on flax/polypropylene-reinforced composites for automotive applications
- Authors: Biyana, Nobuhle Yvonne
- Date: 2015
- Subjects: Polypropylene fibers , Fibrous composites , Reinforced plastics
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:10456 , http://hdl.handle.net/10948/d1021150
- Description: The use of natural fibers as reinforcement in thermoplastics presents an interesting alternative for the production of low cost and ecologically friendly composites. One of the advantages of using natural fibres is their low specific weight, resulting in higher specific strength and stiffness when compared to glass reinforced composites. Natural fibres also present safer handling and working conditions. They are non-abrasive to mixing and can contribute to significant cost reduction. This work is divided into two phases: Phase 1 deals with developing nonwoven mats composites from flax/polypropylene (PP) and evaluating their properties. Flax/polypropylene fibres (at different weight ratios) were processed by needle-punching technique in order to form nonwoven mats. The mats were compression-molded at a temperature of 180oC to form composite materials. The mechanical, thermal and viscoelastic properties of the composites were analyzed. Composites (untreated and silane-treated) were also subjected to varying conditions of temperature and humidity and the tensile properties of the conditioned and unconditioned composites were investigated. The mechanical properties (tensile, flexural and impact) of flax/PP composites were found to increase and reach maximum values at 30 per cent fibre loading and then decrease at higher fibre content. Thermal studies revealed that the composites were stable up to 320oC and samples containing 40 per cent flax fibres were found to exhibit greater thermal stability than neat PP. The dynamic mechanical analyses of the composites showed that the incorporation of flax in the composites resulted in an increase of the storage modulus with a maximum value exhibited by composite containing 40 per cent fibre loading. Composites containing chemically modified fibres exhibited low tensile modulus after conditioning. Phase 2 is based on the investigation of the effect of nano-calcium carbonate (CaCO3) on the properties of two types of polymer matrices: recycled PP and virgin PP. In this case, composites were prepared by melt-mixing and injection molding. The mechanical and thermal properties of the composites were characterized. The tensile modulus of the nano-CaCO3 filled PP (virgin and recycled) composites were found to increase and reach maximum at 30 per cent nano-CaCO3 loading, while the tensile strength decreased with increasing filler content. Thermal studies showed that the nano-CaCO3 filled PP samples exhibited a one-step degradation pattern and are thermally stable up to 450oC. The thermal stability of the samples was found to decrease following the addition of nano-CaCO3. SEM micrographs of the tensile fractured surfaces of composites of the nano-CaCO3 filled virgin and recycled PP revealed the presence of nano-CaCO3 agglomeration.
- Full Text:
- Date Issued: 2015
- Authors: Biyana, Nobuhle Yvonne
- Date: 2015
- Subjects: Polypropylene fibers , Fibrous composites , Reinforced plastics
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:10456 , http://hdl.handle.net/10948/d1021150
- Description: The use of natural fibers as reinforcement in thermoplastics presents an interesting alternative for the production of low cost and ecologically friendly composites. One of the advantages of using natural fibres is their low specific weight, resulting in higher specific strength and stiffness when compared to glass reinforced composites. Natural fibres also present safer handling and working conditions. They are non-abrasive to mixing and can contribute to significant cost reduction. This work is divided into two phases: Phase 1 deals with developing nonwoven mats composites from flax/polypropylene (PP) and evaluating their properties. Flax/polypropylene fibres (at different weight ratios) were processed by needle-punching technique in order to form nonwoven mats. The mats were compression-molded at a temperature of 180oC to form composite materials. The mechanical, thermal and viscoelastic properties of the composites were analyzed. Composites (untreated and silane-treated) were also subjected to varying conditions of temperature and humidity and the tensile properties of the conditioned and unconditioned composites were investigated. The mechanical properties (tensile, flexural and impact) of flax/PP composites were found to increase and reach maximum values at 30 per cent fibre loading and then decrease at higher fibre content. Thermal studies revealed that the composites were stable up to 320oC and samples containing 40 per cent flax fibres were found to exhibit greater thermal stability than neat PP. The dynamic mechanical analyses of the composites showed that the incorporation of flax in the composites resulted in an increase of the storage modulus with a maximum value exhibited by composite containing 40 per cent fibre loading. Composites containing chemically modified fibres exhibited low tensile modulus after conditioning. Phase 2 is based on the investigation of the effect of nano-calcium carbonate (CaCO3) on the properties of two types of polymer matrices: recycled PP and virgin PP. In this case, composites were prepared by melt-mixing and injection molding. The mechanical and thermal properties of the composites were characterized. The tensile modulus of the nano-CaCO3 filled PP (virgin and recycled) composites were found to increase and reach maximum at 30 per cent nano-CaCO3 loading, while the tensile strength decreased with increasing filler content. Thermal studies showed that the nano-CaCO3 filled PP samples exhibited a one-step degradation pattern and are thermally stable up to 450oC. The thermal stability of the samples was found to decrease following the addition of nano-CaCO3. SEM micrographs of the tensile fractured surfaces of composites of the nano-CaCO3 filled virgin and recycled PP revealed the presence of nano-CaCO3 agglomeration.
- Full Text:
- Date Issued: 2015
Studies towards the development of novel antimalarial agents
- Authors: Adeyemi, Christiana Modupe
- Date: 2015
- Subjects: Antimalarials , Malaria , Drug resistance , Drug development , Enzyme inhibitors , Plasmodium
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/54645 , vital:26596
- Description: Considerable efforts have been made in the modification of existing antimalarial drugs, and the support of incentive programmes have led to a drastic decrease in malaria cases reported by WHO during the past 6 years. However, the development of drug resistance threatens the eradication of this deadly disease and has prompted research on the synthesis of novel antimalarial drugs. Our research has involved the design and synthesis of novel benzylated phosphonate esters as potential 1-deoxy-D-xylose-5-phosphate reductoisomerase (DXR) inhibitors. A series of amidoalkylphosphonate esters were obtained by reacting various 3-subsituted anilines and heterocyclic amines with chloroalkanoyl chlorides and reacting the resulting chloroalkanamides with triethyl phosphite using Michaelis-Arbuzov methodology. Benzylation of the phosphonate esters afforded a series of novel N-benzylated derivatives in good yields and these compounds were fully characterised by NMR and HRMS methods. Several approaches to the introduction of a benzyl group at the C-2 position of the phosphonate ester derivatives have been explored, leading unexpectedly to the isolation of unprecedented tetrahydrofuranyl derivatives. Studies towards the preparation of potential bi-functional PfDXR / HIV-1 RT inhibitors have also been initiated. Preliminary in silico docking studies of selected non-benzylated and benzylated phosphonated derivatives into the Pf-DXR active-site has provided useful insight into the binding potential of these ligands. Bioassays have revealed a very low toxicity for all the synthesised phosphonated compounds and a number of these ligands also exhibit a promising inhibitory activity against the Plasmodium parasite.
- Full Text:
- Date Issued: 2015
- Authors: Adeyemi, Christiana Modupe
- Date: 2015
- Subjects: Antimalarials , Malaria , Drug resistance , Drug development , Enzyme inhibitors , Plasmodium
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/54645 , vital:26596
- Description: Considerable efforts have been made in the modification of existing antimalarial drugs, and the support of incentive programmes have led to a drastic decrease in malaria cases reported by WHO during the past 6 years. However, the development of drug resistance threatens the eradication of this deadly disease and has prompted research on the synthesis of novel antimalarial drugs. Our research has involved the design and synthesis of novel benzylated phosphonate esters as potential 1-deoxy-D-xylose-5-phosphate reductoisomerase (DXR) inhibitors. A series of amidoalkylphosphonate esters were obtained by reacting various 3-subsituted anilines and heterocyclic amines with chloroalkanoyl chlorides and reacting the resulting chloroalkanamides with triethyl phosphite using Michaelis-Arbuzov methodology. Benzylation of the phosphonate esters afforded a series of novel N-benzylated derivatives in good yields and these compounds were fully characterised by NMR and HRMS methods. Several approaches to the introduction of a benzyl group at the C-2 position of the phosphonate ester derivatives have been explored, leading unexpectedly to the isolation of unprecedented tetrahydrofuranyl derivatives. Studies towards the preparation of potential bi-functional PfDXR / HIV-1 RT inhibitors have also been initiated. Preliminary in silico docking studies of selected non-benzylated and benzylated phosphonated derivatives into the Pf-DXR active-site has provided useful insight into the binding potential of these ligands. Bioassays have revealed a very low toxicity for all the synthesised phosphonated compounds and a number of these ligands also exhibit a promising inhibitory activity against the Plasmodium parasite.
- Full Text:
- Date Issued: 2015
Study of the biotransformations and microbiological properties of cymbopogon citratus
- Ajayi, Emmanuel Olusegun https://orcid.org/0000-0002-0838-4948
- Authors: Ajayi, Emmanuel Olusegun https://orcid.org/0000-0002-0838-4948
- Date: 2015
- Subjects: Lemongras , Essences and essential oils
- Language: English
- Type: Doctoral theses , text
- Identifier: http://hdl.handle.net/10353/19737 , vital:43197
- Description: Variations in the essential oil yield, chemical composition and kinetics of chemical transformation, antibacterial, and antioxidant properties of the Cymbopogon citratus cultivated in Alice, Eastern Cape of South Africa, over a period of 12 months using the solvent-free microwave extraction and the modified forms of conventional hydrodistillation methods have been evaluated. The modified forms involve variation in the pH medium to effect extraction and to obtain the whole leaf extracts of Cymbopogon citratus (lemongrass). The GC-MS analyses of the essential oils revealed the presence of 10, 11, 13, and 9 principal compounds in the microwave, extraction, hydrodistillation (water-distilled), hydrodistillation (aciddistilled and hydrodistillation (base-distilled), respectively with citral being the prominent compound in all the various extraction methods, with the water-distilled method having the highest cumulative citral content under the period specified. Each of the components of the oils varied in quantity and quality of yield at different points of the year. Different extraction methods produce different compounds. Increase in the amount of citral content was observed during the maturation stage of Cymbopogon citratus in all the extraction methods. Quantitative evaluation of antibacterial activity, minimum inhibitory concentration (MIC) values were determined on the oils and extracts of Cymbopogon citratus using agar dilution method. The essential oils obtained using all the methods of extraction showed activity against all the tested bacteria at a concentration of 10 mg mL-1. The minimum inhibitory concentrations for the acid-distilled varied between 1.25 and 5.0 mg mL-1, while those obtained by both water- and base-distilled showed equal activity on the microorganisms with the MIC ranging between 2.5 and 10 mg mL-1. The microwave extraction showed the least activity with the MIC of 10 mg mL-1. This however suggested that the oils obtained through acid-distillation showed the greatest activity than all other methods of extraction. Activity of the various extracts on bacteria showed that the ethanol extract had the highest activity on the tested organisms with MIC ranging between 0.625 and 1.25 mg mL-1. This was closely followed by the acid-extract (1.25 and 5.0 mg mL-1), methanol extract (1.25 and 10 mg mL-1), acetone extract (2.5 and 5.0 mg mL-1), and base extract (5.0 mg mL-1). Both cold water and hot water extracts showed the least activity of MIC, >10 mg mL-1. The antioxidant and free-radical scavenging activity of the obtained oils and extracts were tested by means of 1,1-diphenyl-2-picrylhydrazyl radical (DPPH+) assay, [(2,2ˊ-azino bis-(3-ethylbenzothiazoline-6-sulfonic acid)] (ABTS), nitric oxide and ferric reducing power assays. The oils and extracts showed DPPH radical scavenging ability, but not as high as the standard drugs. The base extract showed a higher reducing power than the standard drug, rutin. There were significant differences in the phytochemicals contents of the various leaf extracts. The acetone extract has the highest flavonol, proanthocyanidin, and alkaloid contents. The ethanol extract showed the highest amount of phenolic content with the acid extract, having the least. Thin layer chromatography (TLC) and column chromatography was employed to obtain different fractions of extracts using four eluent solvent systems of varying polarities: toluene, petroleum ether, hexane and ethyl acetate and sprayed with anisaldehyde. A single, visible spot of B-fraction was developed, collected and analyzed as 1-methyl-2,4,5- trinitroimidazole with renown valuable properties. , Thesis (PhD) -- Faculty of Science and Agriculture, 2015
- Full Text:
- Date Issued: 2015
- Authors: Ajayi, Emmanuel Olusegun https://orcid.org/0000-0002-0838-4948
- Date: 2015
- Subjects: Lemongras , Essences and essential oils
- Language: English
- Type: Doctoral theses , text
- Identifier: http://hdl.handle.net/10353/19737 , vital:43197
- Description: Variations in the essential oil yield, chemical composition and kinetics of chemical transformation, antibacterial, and antioxidant properties of the Cymbopogon citratus cultivated in Alice, Eastern Cape of South Africa, over a period of 12 months using the solvent-free microwave extraction and the modified forms of conventional hydrodistillation methods have been evaluated. The modified forms involve variation in the pH medium to effect extraction and to obtain the whole leaf extracts of Cymbopogon citratus (lemongrass). The GC-MS analyses of the essential oils revealed the presence of 10, 11, 13, and 9 principal compounds in the microwave, extraction, hydrodistillation (water-distilled), hydrodistillation (aciddistilled and hydrodistillation (base-distilled), respectively with citral being the prominent compound in all the various extraction methods, with the water-distilled method having the highest cumulative citral content under the period specified. Each of the components of the oils varied in quantity and quality of yield at different points of the year. Different extraction methods produce different compounds. Increase in the amount of citral content was observed during the maturation stage of Cymbopogon citratus in all the extraction methods. Quantitative evaluation of antibacterial activity, minimum inhibitory concentration (MIC) values were determined on the oils and extracts of Cymbopogon citratus using agar dilution method. The essential oils obtained using all the methods of extraction showed activity against all the tested bacteria at a concentration of 10 mg mL-1. The minimum inhibitory concentrations for the acid-distilled varied between 1.25 and 5.0 mg mL-1, while those obtained by both water- and base-distilled showed equal activity on the microorganisms with the MIC ranging between 2.5 and 10 mg mL-1. The microwave extraction showed the least activity with the MIC of 10 mg mL-1. This however suggested that the oils obtained through acid-distillation showed the greatest activity than all other methods of extraction. Activity of the various extracts on bacteria showed that the ethanol extract had the highest activity on the tested organisms with MIC ranging between 0.625 and 1.25 mg mL-1. This was closely followed by the acid-extract (1.25 and 5.0 mg mL-1), methanol extract (1.25 and 10 mg mL-1), acetone extract (2.5 and 5.0 mg mL-1), and base extract (5.0 mg mL-1). Both cold water and hot water extracts showed the least activity of MIC, >10 mg mL-1. The antioxidant and free-radical scavenging activity of the obtained oils and extracts were tested by means of 1,1-diphenyl-2-picrylhydrazyl radical (DPPH+) assay, [(2,2ˊ-azino bis-(3-ethylbenzothiazoline-6-sulfonic acid)] (ABTS), nitric oxide and ferric reducing power assays. The oils and extracts showed DPPH radical scavenging ability, but not as high as the standard drugs. The base extract showed a higher reducing power than the standard drug, rutin. There were significant differences in the phytochemicals contents of the various leaf extracts. The acetone extract has the highest flavonol, proanthocyanidin, and alkaloid contents. The ethanol extract showed the highest amount of phenolic content with the acid extract, having the least. Thin layer chromatography (TLC) and column chromatography was employed to obtain different fractions of extracts using four eluent solvent systems of varying polarities: toluene, petroleum ether, hexane and ethyl acetate and sprayed with anisaldehyde. A single, visible spot of B-fraction was developed, collected and analyzed as 1-methyl-2,4,5- trinitroimidazole with renown valuable properties. , Thesis (PhD) -- Faculty of Science and Agriculture, 2015
- Full Text:
- Date Issued: 2015
Study South Africa
- International Education Association of South Africa (IEASA), Jooste, Nico
- Authors: International Education Association of South Africa (IEASA) , Jooste, Nico
- Date: 2015
- Subjects: Education, Higher -- South Africa , Education and globalization -- South Africa Student mobility -- Africa International education -- South Africa Education, Higher -- International cooperation , Universities and colleges -- South Africa , Technical Institutes -- South Africa , Vocational guidance -- South Africa
- Language: English
- Type: text , book
- Identifier: http://hdl.handle.net/10962/64911 , vital:28636 , ISBN 9780620672306
- Description: [Editor's Letter]: This, the 15th edition of Study South Africa, continues to provide a platform for South African universities to profile themselves. It also provides highlights from the South African Higher Education system for the past year. This edition will focus on research and the internationalisation of research in the South African context. Study South Africa has established itself as the international mouthpiece for South African universities and without missing a beat has been produced by volunteers who, with enthusiasm, have dedicated their time and intellect to promote Higher Education Internationalisation as well as to promote South Africa as a knowledge destination for students, academics and professional staff. It is a special privilege and honour to write the introductory message for this 15th edition of Study South Africa as President of IEASA and Editor of the publication. In an era where global re-organisation is dominating the Higher Education scene and new alliances are formed to emulate the new geopolitical landscape, we need to take note of all the challenges facing Higher Education Internationalisation. A number of trends can be identified as major influences on Higher Education on a global scale. I will focus on some of those trends affecting Higher Education in emerging economies and the developing world. The first of these trends is the focus on regional and south-south cooperation. South African universities indicated their intent to further develop closer relationships with universities in Africa through their participation in the re-thinking of Africa’s future during the African Higher Education Summit on the Revitalisation of Higher Education for Africa’s future, in Dakar, Senegal during March 2015. The vision agreed upon during the summit is to ‘develop a high quality, massive, vibrant, diverse, differentiated, innovative, autonomous and socially responsible Higher Education sector. This sector will be a driving force to achieving the vision outlined in the Agenda 2063 by the African Union with a commitment to a shared strategic framework for the inclusive growth, sustainable development and global strategy to optimise the use of Africa’s resources for the benefit of all Africans’. The role of universities would be to develop closer cooperation as well as to advance research with a focus on innovation and sustainable economic growth that will integrate African economies as equal partners in the world economy. It is clear from the vision that although the emphasis should be on inter-African collaboration, collaboration with institutions outside the African continent should not be excluded to achieve the knowledge creation needed to achieve Agenda 2063. Another Higher Education Internationalisation trend in South Africa is the development of closer cooperation within the BRICS countries. The agreements reached and strategies agreed to during the BRICS Summit in Ufa, and included in the Ufa Declaration of 17 June 2015, open doors to future collaborations between BRICS universities. It is envisaged that in the next year the constituent meeting of the BRICS University Network and the establishment of the BRICS Universities League will provide the necessary framework for future collaboration amongst universities from the BRICS member countries. It is imperative that organisations like IEASA and the Brazilian FAUBAI play a key role in the establishment and function of the above mentioned networks. We can provide the necessary support and leadership to other member countries where Higher Education Internationalisation is still at the early stages of conceptualisation and organisation. It will be important to make effective use of the occasion of the Global Conference on Higher Education Internationalisation, scheduled to take place in South Africa in August 2016, to debate and set the future agenda for the BRICS University Network in relation to the rest of the world. It is also vital that the BRICS universities as well as the universities in Africa integrate fully with the rest of the world instead of developing a separate grouping. , 15th Edition
- Full Text:
- Date Issued: 2015
- Authors: International Education Association of South Africa (IEASA) , Jooste, Nico
- Date: 2015
- Subjects: Education, Higher -- South Africa , Education and globalization -- South Africa Student mobility -- Africa International education -- South Africa Education, Higher -- International cooperation , Universities and colleges -- South Africa , Technical Institutes -- South Africa , Vocational guidance -- South Africa
- Language: English
- Type: text , book
- Identifier: http://hdl.handle.net/10962/64911 , vital:28636 , ISBN 9780620672306
- Description: [Editor's Letter]: This, the 15th edition of Study South Africa, continues to provide a platform for South African universities to profile themselves. It also provides highlights from the South African Higher Education system for the past year. This edition will focus on research and the internationalisation of research in the South African context. Study South Africa has established itself as the international mouthpiece for South African universities and without missing a beat has been produced by volunteers who, with enthusiasm, have dedicated their time and intellect to promote Higher Education Internationalisation as well as to promote South Africa as a knowledge destination for students, academics and professional staff. It is a special privilege and honour to write the introductory message for this 15th edition of Study South Africa as President of IEASA and Editor of the publication. In an era where global re-organisation is dominating the Higher Education scene and new alliances are formed to emulate the new geopolitical landscape, we need to take note of all the challenges facing Higher Education Internationalisation. A number of trends can be identified as major influences on Higher Education on a global scale. I will focus on some of those trends affecting Higher Education in emerging economies and the developing world. The first of these trends is the focus on regional and south-south cooperation. South African universities indicated their intent to further develop closer relationships with universities in Africa through their participation in the re-thinking of Africa’s future during the African Higher Education Summit on the Revitalisation of Higher Education for Africa’s future, in Dakar, Senegal during March 2015. The vision agreed upon during the summit is to ‘develop a high quality, massive, vibrant, diverse, differentiated, innovative, autonomous and socially responsible Higher Education sector. This sector will be a driving force to achieving the vision outlined in the Agenda 2063 by the African Union with a commitment to a shared strategic framework for the inclusive growth, sustainable development and global strategy to optimise the use of Africa’s resources for the benefit of all Africans’. The role of universities would be to develop closer cooperation as well as to advance research with a focus on innovation and sustainable economic growth that will integrate African economies as equal partners in the world economy. It is clear from the vision that although the emphasis should be on inter-African collaboration, collaboration with institutions outside the African continent should not be excluded to achieve the knowledge creation needed to achieve Agenda 2063. Another Higher Education Internationalisation trend in South Africa is the development of closer cooperation within the BRICS countries. The agreements reached and strategies agreed to during the BRICS Summit in Ufa, and included in the Ufa Declaration of 17 June 2015, open doors to future collaborations between BRICS universities. It is envisaged that in the next year the constituent meeting of the BRICS University Network and the establishment of the BRICS Universities League will provide the necessary framework for future collaboration amongst universities from the BRICS member countries. It is imperative that organisations like IEASA and the Brazilian FAUBAI play a key role in the establishment and function of the above mentioned networks. We can provide the necessary support and leadership to other member countries where Higher Education Internationalisation is still at the early stages of conceptualisation and organisation. It will be important to make effective use of the occasion of the Global Conference on Higher Education Internationalisation, scheduled to take place in South Africa in August 2016, to debate and set the future agenda for the BRICS University Network in relation to the rest of the world. It is also vital that the BRICS universities as well as the universities in Africa integrate fully with the rest of the world instead of developing a separate grouping. , 15th Edition
- Full Text:
- Date Issued: 2015
Subjective well-being in Africa
- Botha, Ferdi, Snowball, Jeanette D
- Authors: Botha, Ferdi , Snowball, Jeanette D
- Date: 2015
- Language: English
- Type: article , text
- Identifier: http://hdl.handle.net/10962/61084 , vital:27946
- Description: Research on quality of life and subjective well-being (SWB) has witnessed a remarkable growth over the past four decades or so. Since Easterlin’s (1974) seminal contribution on the relationship between happiness and income, thousands of studies have followed that examine the intricacies of subjective well-being (for reviews, see Frey and Stutzer, 2002; Dolan et al., 2008; MacKerron, 2012). These studies have uncovered some very important aspects of individual well-being and have pointed to the fact that money or income is not always (as is often assumed) the most important determinant of SWB.
- Full Text:
- Date Issued: 2015
- Authors: Botha, Ferdi , Snowball, Jeanette D
- Date: 2015
- Language: English
- Type: article , text
- Identifier: http://hdl.handle.net/10962/61084 , vital:27946
- Description: Research on quality of life and subjective well-being (SWB) has witnessed a remarkable growth over the past four decades or so. Since Easterlin’s (1974) seminal contribution on the relationship between happiness and income, thousands of studies have followed that examine the intricacies of subjective well-being (for reviews, see Frey and Stutzer, 2002; Dolan et al., 2008; MacKerron, 2012). These studies have uncovered some very important aspects of individual well-being and have pointed to the fact that money or income is not always (as is often assumed) the most important determinant of SWB.
- Full Text:
- Date Issued: 2015
Substantive equality and the defence of affirmative-action
- Keith-Bandath, Rasheed Ethan
- Authors: Keith-Bandath, Rasheed Ethan
- Date: 2015
- Subjects: Equality before the law -- South Africa , Labor laws and legislation -- South Africa
- Language: English
- Type: Thesis , Masters , LLM
- Identifier: http://hdl.handle.net/10948/3899 , vital:20474
- Description: Giving effect to the constitutional right to equality and the peculiar nature thereof in a heterogeneous society such as South Africa has proved to be a perplexing task. This is apparent when analyzing case law on the subject which demonstrates that our courts are regularly confronted with complex equality claims, and as a consequence, naturally have to make difficult decisions which in turn contribute toward our emerging and developing equality jurisprudence and ultimately the achievement of the constitutional standard of equality. This treatise considers substantive equality as a species of equality in the workplace and the defence of affirmative-action justification in terms of section 6 of the Employment Equity Act. In doing so, it outlines the seemingly peculiar application of affirmative action in a society that was once divided along racial and gender lines, a society that has once experienced one of the most severe forms of racial discrimination in the form of apartheid and its associated laws, policies and practices. This oppressive political regime had the effect of entrenching a deep legacy of racism, deprivation, exclusion and discrimination into the social fabric of society, which in turn had a disproportionate impact on the majority of people or categories of people relative to an elite minority. The legacy of this oppressive political system remains alarmingly evident today. The treatise reveals the challenges and difficulties a society faces in attempting to break with past patterns of disadvantage and its efforts to build a society that is non-racist, non-sexist, socially just and inclusive. The Constitution with its transformative vision should be considered the genesis of this credible and abiding process of redress. It is this exercise of redress coupled with the Constitution’s transformative mandate that raises difficult issues of restoration and reparation for past injustice, and the most appropriate and accommodating manner to do so. In addition to the Constitution, Parliament has enacted national legislation as a transformative agent in the workplace. The EEA as a legislative instrument was designed to give effect to the constitutional right to equality in the workplace. It emphatically prohibits unfair discrimination, but also obliges designated employers to implement affirmative-action measures. For such measures not to be unfairly discriminatory, they must be consistent with the purpose of the EEA. A plain reading of the EEA reveals that it does not provide sufficient guidelines for valid affirmative action. However, the EEA provides an interpretive injunction in that it must be interpreted in light of the Constitution and international law. In this regard the Constitutional Court in Minister of Finance v Van Heerden 1 in interpreting the Constitution, developed a test to assess whether a restitutionary measure such as affirmative action is in fact and in law a valid measure. To date this test is generally not followed, despite the authority of the judgment. In this regard, the courts have developed sound, but sometimes inconsistent principles and standards to test for the validity of affirmative action and to adjudge whether such measures are compliant with the Act. The test has also recently been reaffirmed in the recent judgment of South African Police Service v Solidarity obo Barnard.2 It is anticipated that affirmative-action case law will henceforth develop along the same lines. In this we appreciate judicial guidance and supervision in interpreting and pronouncing upon the legitimacy and validity of affirmative-action measures.
- Full Text:
- Date Issued: 2015
- Authors: Keith-Bandath, Rasheed Ethan
- Date: 2015
- Subjects: Equality before the law -- South Africa , Labor laws and legislation -- South Africa
- Language: English
- Type: Thesis , Masters , LLM
- Identifier: http://hdl.handle.net/10948/3899 , vital:20474
- Description: Giving effect to the constitutional right to equality and the peculiar nature thereof in a heterogeneous society such as South Africa has proved to be a perplexing task. This is apparent when analyzing case law on the subject which demonstrates that our courts are regularly confronted with complex equality claims, and as a consequence, naturally have to make difficult decisions which in turn contribute toward our emerging and developing equality jurisprudence and ultimately the achievement of the constitutional standard of equality. This treatise considers substantive equality as a species of equality in the workplace and the defence of affirmative-action justification in terms of section 6 of the Employment Equity Act. In doing so, it outlines the seemingly peculiar application of affirmative action in a society that was once divided along racial and gender lines, a society that has once experienced one of the most severe forms of racial discrimination in the form of apartheid and its associated laws, policies and practices. This oppressive political regime had the effect of entrenching a deep legacy of racism, deprivation, exclusion and discrimination into the social fabric of society, which in turn had a disproportionate impact on the majority of people or categories of people relative to an elite minority. The legacy of this oppressive political system remains alarmingly evident today. The treatise reveals the challenges and difficulties a society faces in attempting to break with past patterns of disadvantage and its efforts to build a society that is non-racist, non-sexist, socially just and inclusive. The Constitution with its transformative vision should be considered the genesis of this credible and abiding process of redress. It is this exercise of redress coupled with the Constitution’s transformative mandate that raises difficult issues of restoration and reparation for past injustice, and the most appropriate and accommodating manner to do so. In addition to the Constitution, Parliament has enacted national legislation as a transformative agent in the workplace. The EEA as a legislative instrument was designed to give effect to the constitutional right to equality in the workplace. It emphatically prohibits unfair discrimination, but also obliges designated employers to implement affirmative-action measures. For such measures not to be unfairly discriminatory, they must be consistent with the purpose of the EEA. A plain reading of the EEA reveals that it does not provide sufficient guidelines for valid affirmative action. However, the EEA provides an interpretive injunction in that it must be interpreted in light of the Constitution and international law. In this regard the Constitutional Court in Minister of Finance v Van Heerden 1 in interpreting the Constitution, developed a test to assess whether a restitutionary measure such as affirmative action is in fact and in law a valid measure. To date this test is generally not followed, despite the authority of the judgment. In this regard, the courts have developed sound, but sometimes inconsistent principles and standards to test for the validity of affirmative action and to adjudge whether such measures are compliant with the Act. The test has also recently been reaffirmed in the recent judgment of South African Police Service v Solidarity obo Barnard.2 It is anticipated that affirmative-action case law will henceforth develop along the same lines. In this we appreciate judicial guidance and supervision in interpreting and pronouncing upon the legitimacy and validity of affirmative-action measures.
- Full Text:
- Date Issued: 2015
Sunrays in a chilly winter
- Authors: Nolutshungu, Simphiwe
- Date: 2015
- Subjects: Creative writing (Higher education) -- South Africa , South African poetry (English) -- Study and teaching (Higher) , South African poetry (English) -- 21st century , South Africa -- Poetry
- Language: English , Xhosa
- Type: Thesis , Masters , MA
- Identifier: vital:5993 , http://hdl.handle.net/10962/d1017777
- Description: In both my English and IsiXhosa poetry, my themes are love, politics, and the social issues of rural communities, and include my own life experiences, both good and bad. My poems are mainly short narrative accounts of township life. Although they do have a broad educational purpose, they do not preach to the reader. In IsiXhosa, my poetic forms are influenced by the works of J J R Jolobe, W N Mbovane, P T Mtuze, and my English poems by Pablo Neruda, Mafika Pascal Gwala, Garcia Lorca and others. , Intliziyo yona izimele gxebe ifihlakele Iyimfihlo, kumagumbi omphefumlo. Iyafunxa, ifukame kulo magumbi amxinwa. Iingcango, mba! Zivaliwe! Maxa wambi zide zixel’ isisila senkukhu, sona sibonwa mhla ligquthayo. Vul’ amehlo ubaz’ iindlebe uchul’ ukunyathela. Yiza ndikubambe ngesandla, sivul’ iingcango! Masivul’ iingcango zentliziyo yam, sikrobe ngaphakathi! Masithi ntla‐ntla kumagumb’ amathathu kuphela! Masithi ntla‐ntla, kwelepolitiki yakwaXhosa, Kaloku nam ndingumXhosa! Masithi ntla‐ntla kwelifukame, i.z.i.x.i.n.g.a.x.i n.o.b.u.n.c.w.a.n.e. b.o.t.h.a.n.d.o, kaloku nam ndinemithamb’ ebalek’ igaz’ eliqhumayo! Ucango lokugqibela lukungenisa kwigumbi elinezidl’ umzi, Kaloku nam ndizalwa kulo mzi wakwaXhoooooosa! , This thesis is presented in two parts: English and isiXhosa.
- Full Text:
- Date Issued: 2015
- Authors: Nolutshungu, Simphiwe
- Date: 2015
- Subjects: Creative writing (Higher education) -- South Africa , South African poetry (English) -- Study and teaching (Higher) , South African poetry (English) -- 21st century , South Africa -- Poetry
- Language: English , Xhosa
- Type: Thesis , Masters , MA
- Identifier: vital:5993 , http://hdl.handle.net/10962/d1017777
- Description: In both my English and IsiXhosa poetry, my themes are love, politics, and the social issues of rural communities, and include my own life experiences, both good and bad. My poems are mainly short narrative accounts of township life. Although they do have a broad educational purpose, they do not preach to the reader. In IsiXhosa, my poetic forms are influenced by the works of J J R Jolobe, W N Mbovane, P T Mtuze, and my English poems by Pablo Neruda, Mafika Pascal Gwala, Garcia Lorca and others. , Intliziyo yona izimele gxebe ifihlakele Iyimfihlo, kumagumbi omphefumlo. Iyafunxa, ifukame kulo magumbi amxinwa. Iingcango, mba! Zivaliwe! Maxa wambi zide zixel’ isisila senkukhu, sona sibonwa mhla ligquthayo. Vul’ amehlo ubaz’ iindlebe uchul’ ukunyathela. Yiza ndikubambe ngesandla, sivul’ iingcango! Masivul’ iingcango zentliziyo yam, sikrobe ngaphakathi! Masithi ntla‐ntla kumagumb’ amathathu kuphela! Masithi ntla‐ntla, kwelepolitiki yakwaXhosa, Kaloku nam ndingumXhosa! Masithi ntla‐ntla kwelifukame, i.z.i.x.i.n.g.a.x.i n.o.b.u.n.c.w.a.n.e. b.o.t.h.a.n.d.o, kaloku nam ndinemithamb’ ebalek’ igaz’ eliqhumayo! Ucango lokugqibela lukungenisa kwigumbi elinezidl’ umzi, Kaloku nam ndizalwa kulo mzi wakwaXhoooooosa! , This thesis is presented in two parts: English and isiXhosa.
- Full Text:
- Date Issued: 2015
Supporting the implementation of alternatives to corporal punishment in the Eastern Cape secondary schools : towards a framework for school management teams and teachers
- Authors: Kalipa, Velelo Clifton
- Date: 2015
- Subjects: School discipline -- South Africa -- Eastern Cape Corporal punishment of children -- South Africa -- Eastern Cape Rewards and punishments in education
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10353/5664 , vital:29359
- Description: Alternative to corporal punishment in schools is a worldwide practice. Most countries have banned the use of corporal punishment in schools and have promulgated laws and adopted policies aiming to enforce the practice of alternative to corporal punishment. South Africa is one of the countries that have introduced policy on alternatives to corporal punishment. However, this policy does not provide details on how School Management Teams (SMTs) and teachers should support the implementation of alternatives to corporal punishment; as a result, schools end up having different approaches in as far as implementing alternatives to corporal punishment is concerned. There is also a serious problem of indiscipline in schools and this has since attracted growing attention of researchers in South Africa and the whole world. There are serious offences by learners in schools which range from serious criminal ones such as drug abuse, assaults, theft, murders and rapes to less serious ones such as truancy, incomplete projects, absenteeism and lateness, dodging and bunking of classes in schools. This study therefore sought to investigate how SMT and teachers support the implementation of alternatives to corporal punishment in schools. This was a multi case study of four secondary schools in the King Williams Town Education District which was conducted through qualitative research approach. Interviews and documentary analysis were used to collect data and a total of 16 participants (four principals, four SMT members and eight teachers) were selected. From the data, it emerged that some teachers were fixed in using corporal punishment to discipline learners in schools. The data also showed that the alternatives to corporal punishment (ATCP) policies were inconsistently applied as schools had different approaches in as far as how ATCP is implemented and that some schools had no ATCP policies at all. It also emerged from the data that school leadership was a problem in as far as supporting the implementation of ATCP in schools as in some schools the issues of disciplining learners was centralised in the principal’s office. It also became clear that the majority of participants did not understand the national policy on ATCP. There were no indications of parental involvement in the implementation of ATCP in schools. It can be concluded that the channels of communication among principals, SMTs, teachers with regards to the implementation of ATCP was problematic as there were no clear roles as to how each of these officials should implement ATCP. Some teachers still perceived the ATCP as unsuitable for maintaining discipline in rural schools and their discipline strategies were still characterized by punitive measures which border on corporal punishment. School discipline was not seen as a societal matter where other relevant stakeholders could play a pivotal role in learner discipline. This had a negative impact on the school discipline. Learners had no responsibility on maintenance of positive school atmosphere as they were not in any way part taking in the maintenance of discipline in schools. This study therefore recommends a comprehensive framework for the implementation of ATCP that will give details on the roles of SMTs and teachers in the implementation of ATCP in schools. It is recommended that this framework be inclusive of parents and other community stakeholders who would give different perspectives on the implementation of ATCP in schools as education is a societal matter. It is also recommended that more research be conducted that will deal with urban schools and on the involvement of parents and other stakeholders in the implementation of ATCP.
- Full Text:
- Date Issued: 2015
- Authors: Kalipa, Velelo Clifton
- Date: 2015
- Subjects: School discipline -- South Africa -- Eastern Cape Corporal punishment of children -- South Africa -- Eastern Cape Rewards and punishments in education
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10353/5664 , vital:29359
- Description: Alternative to corporal punishment in schools is a worldwide practice. Most countries have banned the use of corporal punishment in schools and have promulgated laws and adopted policies aiming to enforce the practice of alternative to corporal punishment. South Africa is one of the countries that have introduced policy on alternatives to corporal punishment. However, this policy does not provide details on how School Management Teams (SMTs) and teachers should support the implementation of alternatives to corporal punishment; as a result, schools end up having different approaches in as far as implementing alternatives to corporal punishment is concerned. There is also a serious problem of indiscipline in schools and this has since attracted growing attention of researchers in South Africa and the whole world. There are serious offences by learners in schools which range from serious criminal ones such as drug abuse, assaults, theft, murders and rapes to less serious ones such as truancy, incomplete projects, absenteeism and lateness, dodging and bunking of classes in schools. This study therefore sought to investigate how SMT and teachers support the implementation of alternatives to corporal punishment in schools. This was a multi case study of four secondary schools in the King Williams Town Education District which was conducted through qualitative research approach. Interviews and documentary analysis were used to collect data and a total of 16 participants (four principals, four SMT members and eight teachers) were selected. From the data, it emerged that some teachers were fixed in using corporal punishment to discipline learners in schools. The data also showed that the alternatives to corporal punishment (ATCP) policies were inconsistently applied as schools had different approaches in as far as how ATCP is implemented and that some schools had no ATCP policies at all. It also emerged from the data that school leadership was a problem in as far as supporting the implementation of ATCP in schools as in some schools the issues of disciplining learners was centralised in the principal’s office. It also became clear that the majority of participants did not understand the national policy on ATCP. There were no indications of parental involvement in the implementation of ATCP in schools. It can be concluded that the channels of communication among principals, SMTs, teachers with regards to the implementation of ATCP was problematic as there were no clear roles as to how each of these officials should implement ATCP. Some teachers still perceived the ATCP as unsuitable for maintaining discipline in rural schools and their discipline strategies were still characterized by punitive measures which border on corporal punishment. School discipline was not seen as a societal matter where other relevant stakeholders could play a pivotal role in learner discipline. This had a negative impact on the school discipline. Learners had no responsibility on maintenance of positive school atmosphere as they were not in any way part taking in the maintenance of discipline in schools. This study therefore recommends a comprehensive framework for the implementation of ATCP that will give details on the roles of SMTs and teachers in the implementation of ATCP in schools. It is recommended that this framework be inclusive of parents and other community stakeholders who would give different perspectives on the implementation of ATCP in schools as education is a societal matter. It is also recommended that more research be conducted that will deal with urban schools and on the involvement of parents and other stakeholders in the implementation of ATCP.
- Full Text:
- Date Issued: 2015
Supportive strategies for teachers and parents dealing with learners experiencing mild intellectual barriers to learning
- Authors: Swartz, Deon Jude
- Date: 2015
- Subjects: Learning disabilities , Inclusive education
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10948/5065 , vital:20799
- Description: Education support provision underwent a complete metamorphosis with the adoption of Education White Paper 6: Building an Inclusive Education and Training System in 2001. Within this new paradigm, learners who experience Mild intellectual barriers to learning are understood from a culture of inclusion and accommodation within mainstream education, alongside their non disabled peers. Another important development within Inclusive Education is the recognition of parents as important role-players in their children’s education. This bold transformation implies that teachers and parents need the necessary support from health professionals and support staff at District Based Support Teams (DBSTs) attached to the local Education Support Centres, in order for them to support their children who experience Mild intellectual barriers to learning. As a result of the radical overhaul of the education system to accommodate learners who experience Mild intellectual barriers to learning in mainstream schools, the main aim of the study is to establish the implications for teachers and parents who deal with such learners. The researcher employed a qualitative research design within an interpretive paradigm from a phenomenological perspective, in order to capture the organic richness of the participants’ perceived experiences with regards to the phenomenon under investigation. The researcher made use of a combination of convenience, judgement and purposive sampling. The sample group included teachers and parents from two primary schools who deal with learners who experience Mild intellectual barriers to learning. The learners had previously been assessed psychometrically by Educational Psychologists and identified as fulfilling the criteria for Mild intellectual barriers to learning. Data were collected by means of semi-structured interviews and separate interview schedules were drafted for teachers and parents. Data was analysed using Tesch’s eight step data analysis procedure to identify common themes which emerged from the participants’ responses. The findings of the research indicated teachers and parents had different perceptions about their roles in regards to the children whose learning they support. It also indicated that teachers experience challenges in their attempts to support their learners who experience Mild intellectual barriers in their classes, and with understanding the philosophy of Inclusive education. Furthermore, both parents and teachers experience a lack of support from health professionals and Inclusive Education specialists at the DBSTs within Bronfenbrenner’s eco-systemic framework, which formed the theoretical foundation for this study. Consequently, strategies to support teachers and parents to address these challenges were proposed.
- Full Text:
- Date Issued: 2015
- Authors: Swartz, Deon Jude
- Date: 2015
- Subjects: Learning disabilities , Inclusive education
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10948/5065 , vital:20799
- Description: Education support provision underwent a complete metamorphosis with the adoption of Education White Paper 6: Building an Inclusive Education and Training System in 2001. Within this new paradigm, learners who experience Mild intellectual barriers to learning are understood from a culture of inclusion and accommodation within mainstream education, alongside their non disabled peers. Another important development within Inclusive Education is the recognition of parents as important role-players in their children’s education. This bold transformation implies that teachers and parents need the necessary support from health professionals and support staff at District Based Support Teams (DBSTs) attached to the local Education Support Centres, in order for them to support their children who experience Mild intellectual barriers to learning. As a result of the radical overhaul of the education system to accommodate learners who experience Mild intellectual barriers to learning in mainstream schools, the main aim of the study is to establish the implications for teachers and parents who deal with such learners. The researcher employed a qualitative research design within an interpretive paradigm from a phenomenological perspective, in order to capture the organic richness of the participants’ perceived experiences with regards to the phenomenon under investigation. The researcher made use of a combination of convenience, judgement and purposive sampling. The sample group included teachers and parents from two primary schools who deal with learners who experience Mild intellectual barriers to learning. The learners had previously been assessed psychometrically by Educational Psychologists and identified as fulfilling the criteria for Mild intellectual barriers to learning. Data were collected by means of semi-structured interviews and separate interview schedules were drafted for teachers and parents. Data was analysed using Tesch’s eight step data analysis procedure to identify common themes which emerged from the participants’ responses. The findings of the research indicated teachers and parents had different perceptions about their roles in regards to the children whose learning they support. It also indicated that teachers experience challenges in their attempts to support their learners who experience Mild intellectual barriers in their classes, and with understanding the philosophy of Inclusive education. Furthermore, both parents and teachers experience a lack of support from health professionals and Inclusive Education specialists at the DBSTs within Bronfenbrenner’s eco-systemic framework, which formed the theoretical foundation for this study. Consequently, strategies to support teachers and parents to address these challenges were proposed.
- Full Text:
- Date Issued: 2015
Surface modification of silica-coated gadolinium oxide nanoparticles with zinc tetracarboxyphenoxy phthalocyanine for the photodegradation of Orange G
- Ledwaba, Mpho, Masilela, Nkosiphile, Nyokong, Tebello, Antunes, Edith M
- Authors: Ledwaba, Mpho , Masilela, Nkosiphile , Nyokong, Tebello , Antunes, Edith M
- Date: 2015
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/193621 , vital:45353 , xlink:href="https://doi.org/10.1016/j.molcata.2015.03.023"
- Description: Zinc tetracarboxyphenoxy phthalocyanine was covalently linked to Gd2O3 nanoparticles for the photocatalytic degradation of Orange G. Characterization of the composite was carried out using XRD, TEM, XPS, UV–vis spectroscopy and FT-IR spectroscopy. The composite showed improved photophysical properties over the phthalocyanine alone and the catalyst was found to be reusable. Analyses of the photodegradation rates of the azo dye indicated pseudo first-order kinetics.
- Full Text:
- Date Issued: 2015
- Authors: Ledwaba, Mpho , Masilela, Nkosiphile , Nyokong, Tebello , Antunes, Edith M
- Date: 2015
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/193621 , vital:45353 , xlink:href="https://doi.org/10.1016/j.molcata.2015.03.023"
- Description: Zinc tetracarboxyphenoxy phthalocyanine was covalently linked to Gd2O3 nanoparticles for the photocatalytic degradation of Orange G. Characterization of the composite was carried out using XRD, TEM, XPS, UV–vis spectroscopy and FT-IR spectroscopy. The composite showed improved photophysical properties over the phthalocyanine alone and the catalyst was found to be reusable. Analyses of the photodegradation rates of the azo dye indicated pseudo first-order kinetics.
- Full Text:
- Date Issued: 2015
Survival of bifidobacteria and their usefulness in faecal source tracking
- Luyt, Catherine D, Khamanga, Sandile M, Muller, Wilhelmine J, Tandlich, Roman
- Authors: Luyt, Catherine D , Khamanga, Sandile M , Muller, Wilhelmine J , Tandlich, Roman
- Date: 2015
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/76117 , vital:30508 , https://doi.org/10.1515/lwr-2015-0001
- Description: Bifidobacteria have long since been recommended as indicators of human and animal pollution. Concentration ratio (tracking ratio) of the sorbitol-utilising bifidobacteria (SUB) and the total bifidobacteria (TB) can be used to distinguish between animal and human sources of faecal water contamination. The cut-off value needs to be calibrated in a given geographical area. Seven sites with permanent faecal contamination were selected in South Africa. Concentrations of SUB ranged from 10-50000 cells/100 mL, while TB ranged from 0-8000 cells/100 mL. The tracking ratio ranged from 0.10 to 6.25, but no clear cut-off value could be established. The YN-17 agar was replaced for TB with the modified Beerens medium with pH = 5.70, to suppress the growth of faecal streptococci. Tracking ratios observed are most likely the results of different survival rates of SUB and TB. Bifidobacteria die-off due to nutrients was not found to be significant using design of experiment. Thus a lack of continuous input or oxygen levels in water may be major factors. This would limit the ratios used as a faecal source tracking method.
- Full Text:
- Date Issued: 2015
- Authors: Luyt, Catherine D , Khamanga, Sandile M , Muller, Wilhelmine J , Tandlich, Roman
- Date: 2015
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/76117 , vital:30508 , https://doi.org/10.1515/lwr-2015-0001
- Description: Bifidobacteria have long since been recommended as indicators of human and animal pollution. Concentration ratio (tracking ratio) of the sorbitol-utilising bifidobacteria (SUB) and the total bifidobacteria (TB) can be used to distinguish between animal and human sources of faecal water contamination. The cut-off value needs to be calibrated in a given geographical area. Seven sites with permanent faecal contamination were selected in South Africa. Concentrations of SUB ranged from 10-50000 cells/100 mL, while TB ranged from 0-8000 cells/100 mL. The tracking ratio ranged from 0.10 to 6.25, but no clear cut-off value could be established. The YN-17 agar was replaced for TB with the modified Beerens medium with pH = 5.70, to suppress the growth of faecal streptococci. Tracking ratios observed are most likely the results of different survival rates of SUB and TB. Bifidobacteria die-off due to nutrients was not found to be significant using design of experiment. Thus a lack of continuous input or oxygen levels in water may be major factors. This would limit the ratios used as a faecal source tracking method.
- Full Text:
- Date Issued: 2015
Survival of women in law enforcement
- Authors: Badi, Yvonne Tankiso
- Date: 2015
- Subjects: Policewomen -- South Africa -- Eastern Cape , Women police chiefs -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: vital:8860 , http://hdl.handle.net/10948/d1020179
- Description: This study seeks to investigate the underlying ideologies and practices behind the perception that women who are in command positions are unable to command and control, especially those who are in the operational environment. The study was executed in the Eastern Cape Province (Eastern Cape), in Buffalo City Metropolitan Municipality (BCM). The research participants (respondents) were constituted by 33 police officers from diverse police stations within the BCM. The participants were divided according to gender, i.e. 24 females and 9 males. With regards to objectives of the study, the aim was to investigate the following issues: i) to understand factors that make women not to be accepted in their positions as SAPS' operational commanders, by their male subordinateslcolleagues and community members. ii) To understand factors that make women not to be accepted in their positions as SAPS' operational commanders, by their male subordinates/colleagues and community members, and iii) to explore strategies to utilize in making SAPS' women operational commanders, survive while managing their day-te-day respective units/components effectively and efficiently. Regarding research design, this study mainly used a qualitative research method combined with a bit of a quantitative approach. And then the data collection method involved making use of semi structured interviews to all the respondents. The results of this study show that there is still a huge difference in the number of women who are commanders compared to their male counterparts, especially in those environments that were previously regarded as male dominated. Further, despite the necessary training being provided by the SAPS to women officers, the necessary support in particular from management is still a challenge. Lastly, the argument of this study is that there is still not a fair representation of women in command positions within the SAPS, especially, in the previously male dominated environments.
- Full Text:
- Date Issued: 2015
- Authors: Badi, Yvonne Tankiso
- Date: 2015
- Subjects: Policewomen -- South Africa -- Eastern Cape , Women police chiefs -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: vital:8860 , http://hdl.handle.net/10948/d1020179
- Description: This study seeks to investigate the underlying ideologies and practices behind the perception that women who are in command positions are unable to command and control, especially those who are in the operational environment. The study was executed in the Eastern Cape Province (Eastern Cape), in Buffalo City Metropolitan Municipality (BCM). The research participants (respondents) were constituted by 33 police officers from diverse police stations within the BCM. The participants were divided according to gender, i.e. 24 females and 9 males. With regards to objectives of the study, the aim was to investigate the following issues: i) to understand factors that make women not to be accepted in their positions as SAPS' operational commanders, by their male subordinateslcolleagues and community members. ii) To understand factors that make women not to be accepted in their positions as SAPS' operational commanders, by their male subordinates/colleagues and community members, and iii) to explore strategies to utilize in making SAPS' women operational commanders, survive while managing their day-te-day respective units/components effectively and efficiently. Regarding research design, this study mainly used a qualitative research method combined with a bit of a quantitative approach. And then the data collection method involved making use of semi structured interviews to all the respondents. The results of this study show that there is still a huge difference in the number of women who are commanders compared to their male counterparts, especially in those environments that were previously regarded as male dominated. Further, despite the necessary training being provided by the SAPS to women officers, the necessary support in particular from management is still a challenge. Lastly, the argument of this study is that there is still not a fair representation of women in command positions within the SAPS, especially, in the previously male dominated environments.
- Full Text:
- Date Issued: 2015
Sustainability of agricultural cooperatives in Emalahleni Local Municipality
- Authors: Tsholoba, Nokulunga
- Date: 2015
- Subjects: Agriculture, Cooperative -- South Africa -- Mpumalanga , Sustainable development -- South Africa -- Mpumalanga
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10948/4133 , vital:20555
- Description: Long term growth and sustainability of cooperatives has become the focus of many countries worldwide. Cooperatives have been seen as the platform for uplifting disadvantaged communities while improving standards of the poor in countries such as Canada, Kenya, Ghana and Nigeria (Department of Trade and Industry, 2012). In South Africa, cooperatives are seen as playing a role in poverty eradication, equal distribution of wealth, employment creation, food security and as a contributor to the economic activity. The South African government have implemented policies aimed at improving the performance and sustainability of agriculture cooperatives in South Africa. Despite all the efforts cooperatives still face sustainability challenges. Therefore the purpose of this research was to investigate the sustainability challenges that prevent the permanent establishment of cooperatives and to understand the dynamics and nature of failure associated with agricultural cooperatives .A case study methodology was used to examine a single case in-depth and to understand the factors affecting agricultural cooperatives. The main challenges identified in the study include; poor communication, limited access to markets, access to finance, a lack of good governance and a lack of managerial skills. The study recommended capacity building as the first point of reference in order to deal with challenges such as communication, access to markets and a lack of managerial skills. A lack of good governance is regarded as an attitude problem which requires setting ethical standards and rules accompanied by a penalty to the member if they are found to be breaking the rules. Access to finances is regarded as a skills and competence phenomenon which requires people to develop planning and financial literacy skills, which will enable them to formulate business plans and use them as a control tool for managing the cooperative. The business plan is also regarded as an asset or security document which acts as a proof that the cooperative is well planned, organised and sustainable. The research concludes with suggesting areas for future study to investigate the impact of informal education practices on skills development in the success of cooperatives.
- Full Text:
- Date Issued: 2015
- Authors: Tsholoba, Nokulunga
- Date: 2015
- Subjects: Agriculture, Cooperative -- South Africa -- Mpumalanga , Sustainable development -- South Africa -- Mpumalanga
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10948/4133 , vital:20555
- Description: Long term growth and sustainability of cooperatives has become the focus of many countries worldwide. Cooperatives have been seen as the platform for uplifting disadvantaged communities while improving standards of the poor in countries such as Canada, Kenya, Ghana and Nigeria (Department of Trade and Industry, 2012). In South Africa, cooperatives are seen as playing a role in poverty eradication, equal distribution of wealth, employment creation, food security and as a contributor to the economic activity. The South African government have implemented policies aimed at improving the performance and sustainability of agriculture cooperatives in South Africa. Despite all the efforts cooperatives still face sustainability challenges. Therefore the purpose of this research was to investigate the sustainability challenges that prevent the permanent establishment of cooperatives and to understand the dynamics and nature of failure associated with agricultural cooperatives .A case study methodology was used to examine a single case in-depth and to understand the factors affecting agricultural cooperatives. The main challenges identified in the study include; poor communication, limited access to markets, access to finance, a lack of good governance and a lack of managerial skills. The study recommended capacity building as the first point of reference in order to deal with challenges such as communication, access to markets and a lack of managerial skills. A lack of good governance is regarded as an attitude problem which requires setting ethical standards and rules accompanied by a penalty to the member if they are found to be breaking the rules. Access to finances is regarded as a skills and competence phenomenon which requires people to develop planning and financial literacy skills, which will enable them to formulate business plans and use them as a control tool for managing the cooperative. The business plan is also regarded as an asset or security document which acts as a proof that the cooperative is well planned, organised and sustainable. The research concludes with suggesting areas for future study to investigate the impact of informal education practices on skills development in the success of cooperatives.
- Full Text:
- Date Issued: 2015