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Synthesis, characterisation and antitumour activities of lanthanide complexes with hydrazones and carboxylic acid ligands
- Authors: Madanhire, Tatenda
- Date: 2020
- Subjects: Organic acids
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10948/48456 , vital:40878
- Description: The tridentate hydrazone ligands, (E)-N'-(2-hydroxybenzylidene)benzohydrazide (H2phen) and (E)-N'-(2-hydroxybenzylidene)nicotinohydrazide (H2Nic), were synthesised and complexed to Ln(III) acetates. The centrosymmetric, acetato-bridged dinuclear coordination compounds with the formulae, [La2(Hphen)2(OAc)4(H2O)2]·DMF·H2O (1), [Ln2(HNic)2(OAc)4(H2O)2]·DMF·H2O (Ln = La (2) and Nd (3)) and [Ln2(HNic)2(OAc)4(H2O)2]·DMF (Ln = Er (4) and Yb (5)) were isolated and characterised by elemental analyses, IR spectroscopy, UV-Vis spectroscopy, X-ray diffraction studies and SHAPE 2.1. The nine-coordinate complexes 1–3 crystallise in the triclinic space group P-1, with the metal centres having the distorted spherical capped square antiprism geometry (C4v), while the eight-coordinate Er(III) and Yb(III) complexes (monoclinic system, space group P21/c) display the geometry of distorted triangular dodecahedron (D2d). Geometry optimisation of the monoanionic forms of the hydrazone ligands (Hphen– and HNic– ) were performed using Density Functional Theory (DFT) with Becke’s three parameter hybrid method and correlation functional of Lee, Yang and Parr (B3LYP) with augcc-pVTZ basis set. Natural population analysis (NPA) and molecular electrostatic potential (MEP) maps indicated that the most preferred sites for electrophilic attack in the anionic ligands are the phenolate and carbonyl oxygens, and the azomethine nitrogens. The evaluation of the cytotoxic activity of the compounds on breast cancer (MCF-7), the endometrial carcinoma (HEC-1A) and the human monocytic (THP-1) cell lines using the 3-(4,5-dimethyl-2-thiazolyl)-2,5-diphenyl tetrazolium bromide (MTT) assay revealed that the hydrazone ligands and complexes 1–4 are partially cytotoxic against MCF-7 cells, while the Schiff bases and complexes 3–5 significantly inhibit cell growth in HEC-1A cells. The complexation reactions of Ce(III), Nd(III), Gd(III) and Er(III) with the chelating/ bridging monoanionic ligand N-(2,6-dimethylphenyl)oxamate (Hpma– ) in basic media were performed in view of the potential applications of oxamate derivatives as cytotoxic agents. The coordination compounds were characterised by different Abstract T. Madanhire Nelson Mandela University xxvi physico-chemical techniques: elemental analysis, conductivity measurements, IR, 1 H NMR and UV-Vis-NIR spectroscopy. The anionic Hpma– was obtained through conversion of the proligand ethyl (2,6-dimethylphenylcarbamoyl)formate (Hdmp). The reactions afforded lanthanide(III)–oxamate coordination polymers of formulae: {[Ln(Hpma)3(MeOH)(H2O)]∙2MeOH}n (Ln = Ce (1) and Nd (2)), {[Gd2(Hpma)6(MeOH)4]∙6MeOH}n (3), {[Er2(Hpma)6(MeOH)(H2O)3]∙2MeOH}n (4) and [Ln2Na2(Hpma)8(EtOH)(H2O)6]n (Ln = Nd (5) and Gd (6)). The polymeric complexes feature Ln-Hpma moieties bridged by μ2-η 1 :η 1 :η 1 Hpma– , giving onedimensional zig-zag chains of the –Ln–O–C–O–Ln– type. Atomic charge analysis and the MEP map of the Hpma– moiety done using the DFT/B3LYP method were found to be consistent with the chelating and bridging modes of the anionic ligand through all the oxygen atoms. The evaluation of the cytotoxic activities of the metal salts, the proligand and the novel lanthanide complexes on MCF-7, HEC-1A and THP-1 cell lines revealed that only the rare-earth metal salts [Ce(NO3)3∙6H2O] and [Nd(NO3)3∙6H2O] showed modest cytotoxicity against MCF-7 and HEC-1A cells, respectively.
- Full Text:
- Date Issued: 2020
- Authors: Madanhire, Tatenda
- Date: 2020
- Subjects: Organic acids
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10948/48456 , vital:40878
- Description: The tridentate hydrazone ligands, (E)-N'-(2-hydroxybenzylidene)benzohydrazide (H2phen) and (E)-N'-(2-hydroxybenzylidene)nicotinohydrazide (H2Nic), were synthesised and complexed to Ln(III) acetates. The centrosymmetric, acetato-bridged dinuclear coordination compounds with the formulae, [La2(Hphen)2(OAc)4(H2O)2]·DMF·H2O (1), [Ln2(HNic)2(OAc)4(H2O)2]·DMF·H2O (Ln = La (2) and Nd (3)) and [Ln2(HNic)2(OAc)4(H2O)2]·DMF (Ln = Er (4) and Yb (5)) were isolated and characterised by elemental analyses, IR spectroscopy, UV-Vis spectroscopy, X-ray diffraction studies and SHAPE 2.1. The nine-coordinate complexes 1–3 crystallise in the triclinic space group P-1, with the metal centres having the distorted spherical capped square antiprism geometry (C4v), while the eight-coordinate Er(III) and Yb(III) complexes (monoclinic system, space group P21/c) display the geometry of distorted triangular dodecahedron (D2d). Geometry optimisation of the monoanionic forms of the hydrazone ligands (Hphen– and HNic– ) were performed using Density Functional Theory (DFT) with Becke’s three parameter hybrid method and correlation functional of Lee, Yang and Parr (B3LYP) with augcc-pVTZ basis set. Natural population analysis (NPA) and molecular electrostatic potential (MEP) maps indicated that the most preferred sites for electrophilic attack in the anionic ligands are the phenolate and carbonyl oxygens, and the azomethine nitrogens. The evaluation of the cytotoxic activity of the compounds on breast cancer (MCF-7), the endometrial carcinoma (HEC-1A) and the human monocytic (THP-1) cell lines using the 3-(4,5-dimethyl-2-thiazolyl)-2,5-diphenyl tetrazolium bromide (MTT) assay revealed that the hydrazone ligands and complexes 1–4 are partially cytotoxic against MCF-7 cells, while the Schiff bases and complexes 3–5 significantly inhibit cell growth in HEC-1A cells. The complexation reactions of Ce(III), Nd(III), Gd(III) and Er(III) with the chelating/ bridging monoanionic ligand N-(2,6-dimethylphenyl)oxamate (Hpma– ) in basic media were performed in view of the potential applications of oxamate derivatives as cytotoxic agents. The coordination compounds were characterised by different Abstract T. Madanhire Nelson Mandela University xxvi physico-chemical techniques: elemental analysis, conductivity measurements, IR, 1 H NMR and UV-Vis-NIR spectroscopy. The anionic Hpma– was obtained through conversion of the proligand ethyl (2,6-dimethylphenylcarbamoyl)formate (Hdmp). The reactions afforded lanthanide(III)–oxamate coordination polymers of formulae: {[Ln(Hpma)3(MeOH)(H2O)]∙2MeOH}n (Ln = Ce (1) and Nd (2)), {[Gd2(Hpma)6(MeOH)4]∙6MeOH}n (3), {[Er2(Hpma)6(MeOH)(H2O)3]∙2MeOH}n (4) and [Ln2Na2(Hpma)8(EtOH)(H2O)6]n (Ln = Nd (5) and Gd (6)). The polymeric complexes feature Ln-Hpma moieties bridged by μ2-η 1 :η 1 :η 1 Hpma– , giving onedimensional zig-zag chains of the –Ln–O–C–O–Ln– type. Atomic charge analysis and the MEP map of the Hpma– moiety done using the DFT/B3LYP method were found to be consistent with the chelating and bridging modes of the anionic ligand through all the oxygen atoms. The evaluation of the cytotoxic activities of the metal salts, the proligand and the novel lanthanide complexes on MCF-7, HEC-1A and THP-1 cell lines revealed that only the rare-earth metal salts [Ce(NO3)3∙6H2O] and [Nd(NO3)3∙6H2O] showed modest cytotoxicity against MCF-7 and HEC-1A cells, respectively.
- Full Text:
- Date Issued: 2020
The Role of HSP70/HSP90 Organizing Protein (Hop) in the Heat Shock Factor 1 (HSF1)-mediated Stress Response
- Authors: Chakraborty, Abantika
- Date: 2020
- Subjects: Uncatalogued
- Language: English
- Type: thesis , text , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/163204 , vital:41018 , DOI doi:10.21504/10962/163204
- Description: Thesis (PhD)--Rhodes University, Science Faculty, Department of Biochemistry and Microbiology, 2020.
- Full Text:
- Date Issued: 2020
- Authors: Chakraborty, Abantika
- Date: 2020
- Subjects: Uncatalogued
- Language: English
- Type: thesis , text , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/163204 , vital:41018 , DOI doi:10.21504/10962/163204
- Description: Thesis (PhD)--Rhodes University, Science Faculty, Department of Biochemistry and Microbiology, 2020.
- Full Text:
- Date Issued: 2020
Conservation implications of fine scale population genetic structure of Ficus species in South African forests:
- Deng, Jun-Yin, van Noort, Simon, Compton, Stephen G, Chen, Yan, Greeff, Jaco M
- Authors: Deng, Jun-Yin , van Noort, Simon , Compton, Stephen G , Chen, Yan , Greeff, Jaco M
- Date: 2020
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/163838 , vital:41074 , ttps://doi.org/10.1016/j.foreco.2020.118387
- Description: Genetic considerations are rarely applied in forest conservation management strategies, but forest fragmentation can reduce pollen and seed dispersal both between and within isolated fragments. Gene flow and immigration rates determine the extent to which individual plants are related to each other at different distances from themselves. This gradation in relatedness is known as a population's fine scale spatial genetic structure (SGS). Specifically, reduced but clumped immigration from distant fragments reduces fine scale SGS, whereas reduced gene flow within fragments increases fine scale SGS. In addition, non-random mortality caused by post-dispersal ecological processes can also affect SGS. We studied the effects of fragmentation on the fine scale SGS of Ficus species with different habitat preferences and distributional ranges in an archipelago of South African forest patches.
- Full Text:
- Date Issued: 2020
- Authors: Deng, Jun-Yin , van Noort, Simon , Compton, Stephen G , Chen, Yan , Greeff, Jaco M
- Date: 2020
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/163838 , vital:41074 , ttps://doi.org/10.1016/j.foreco.2020.118387
- Description: Genetic considerations are rarely applied in forest conservation management strategies, but forest fragmentation can reduce pollen and seed dispersal both between and within isolated fragments. Gene flow and immigration rates determine the extent to which individual plants are related to each other at different distances from themselves. This gradation in relatedness is known as a population's fine scale spatial genetic structure (SGS). Specifically, reduced but clumped immigration from distant fragments reduces fine scale SGS, whereas reduced gene flow within fragments increases fine scale SGS. In addition, non-random mortality caused by post-dispersal ecological processes can also affect SGS. We studied the effects of fragmentation on the fine scale SGS of Ficus species with different habitat preferences and distributional ranges in an archipelago of South African forest patches.
- Full Text:
- Date Issued: 2020
Thermal tolerance and the potential effects of climate change on coastal intertidal and estuarine organisms in the Kariega Estuary and adjacent intertitdal coastline, Eastern Cape, South Africa
- Authors: Van der Walt, Kerry Ann
- Date: 2020
- Subjects: Ectotherms -- Climatic factors , Ectotherms -- Effect of temperature on , Fishes -- Climatic factors , Fishes -- Effect of temperature on , Climatic changes -- South Africa -- Eastern Cape
- Language: English
- Type: text , Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/148459 , vital:38741
- Description: Temperature changes due to the effects of climate change are evident on all continents and oceans. As a result, there is a growing concern over how marine ectotherms will respond to extreme or fluctuating environmental temperatures. Temperature changes have strong direct and indirect effects on individual, population, and ecosystem functioning traits. A multi-scale approach determining the thermal tolerance and performance of several marine ectotherms belonging to different coastal habitats is rarely considered in thermal physiology studies but is effective for an integrated ecosystem assessment. As such, for this thesis, I aimed to quantify and compare the thermal tolerance and performance of a range of coastal marine ectotherms (fish and macro-invertebrates) with different biogeographical distributions from estuarine, subtidal and rocky intertidal habitats to available and projected in situ temperature data. This was also undertaken to gauge the local vulnerability of each species across summer and winter in a warm-temperate region of South Africa. This was done using a multi-method physiological approach, which included the dynamic method (CTmax and CTmin), static respirometry and maximum heart rate fHmax). Results of the dynamic method on several fish and macro-invertebrate species indicated that there are differences in thermal tolerance according to taxonomy, biogeography and habitat for both summer and winter. Macro-invertebrate species generally had higher CTmax endpoints, lower CTmin endpoints, higher upper and lower breadths in tolerance, higher upper and lower thermal safety margins and higher thermal scopes than the fish species. This could be a result of the macro-invertebrate species studied being less mobile compared with fish species (which are able to move to more favourable conditions) as well as having broader geographical distributions. In addition, macro-invertebrates from the intertidal rock pool habitat (Palaemon peringueyi; Pernaperna) were more tolerant of high and low temperatures compared with the macro-invertebrates from the estuarine habitat (Clibanarius virescens; Parasesarma catenatum; Upogebia africana). Overall, macro-invertebrates, with the exception of Parechinus angulosus, investigated in this study indicated that current temperatures and projected climate change scenarios across seasons would not have a significant impact on them and that they are highly adaptable to changing temperature regimes. This sign of high tolerance was further supported by the heart rates of P. perna and P. catenatum under an acute increase in temperature (1.0 °C.h-1) which showed individuals of each species physiologically depressing their metabolism until a final Arrhenius breakpoint temperature was reached (TAB). Among the fish species investigated in this study, tropical species (Chaetodon marleyi; Kuhlia mugil) had the highest CTmax and CTmin endpoints when compared with the temperate (Diplodus capensis; Sarpa salpa), warm-water endemic (Chelon dumerili; Rhabdosargus holubi) and cool-water endemic (Chelon richardsonii) fishes. This suggests that due to their lower breadths in tolerance and thermal safety margins being small, tropical species may be less tolerant of cold temperatures and thermal variability, especially in the form of summer upwelling events which are expected to increase in intensity and frequency in this region as a result of anthropogenic climate change effects. On the other hand, however, if a temperature increase of 2.0 - 4.0 °C takes place at the end of the century as predicted by the Intergovernmental Panel on Climate Change (IPCC), it is likely that tropical species such as C. marleyi will become more common. Temperate species such as D. capensis and S. salpa were able to tolerate a wide range of temperatures (wide thermal scope) compared with the other fish species. These findings may suggest that D. capensis and S. salpa are thermally resilient and may be the least vulnerable to climate change effects and temperature variability. When evaluating the different life stages of D. capensis, however, using the dynamic method (juveniles and adults), static respirometry (juveniles) and maximum heart rate (adults), results suggested that juveniles of this temperate species will be more resilient to increases in ocean temperatures compared with the adults because they have a higher thermal tolerance (CTmax/TCRIT) and a greater metabolic scope (TOPT) at higher temperatures. For both juveniles and adults, temperatures beyond 28.0 °C (upper Tpej; Tarr) will have a significant impact on their physiology. Using a multi-scale and multi-method approach thus helped to identify which species or community may be vulnerable to the effects of climate change within shallow coastal environments in this warm-temperate climate change hotspot. Adopting this type of approach will assist policy makers in developing comprehensive climate change management frameworks for coastal ecosystems globally and around South Africa. iii
- Full Text:
- Date Issued: 2020
- Authors: Van der Walt, Kerry Ann
- Date: 2020
- Subjects: Ectotherms -- Climatic factors , Ectotherms -- Effect of temperature on , Fishes -- Climatic factors , Fishes -- Effect of temperature on , Climatic changes -- South Africa -- Eastern Cape
- Language: English
- Type: text , Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/148459 , vital:38741
- Description: Temperature changes due to the effects of climate change are evident on all continents and oceans. As a result, there is a growing concern over how marine ectotherms will respond to extreme or fluctuating environmental temperatures. Temperature changes have strong direct and indirect effects on individual, population, and ecosystem functioning traits. A multi-scale approach determining the thermal tolerance and performance of several marine ectotherms belonging to different coastal habitats is rarely considered in thermal physiology studies but is effective for an integrated ecosystem assessment. As such, for this thesis, I aimed to quantify and compare the thermal tolerance and performance of a range of coastal marine ectotherms (fish and macro-invertebrates) with different biogeographical distributions from estuarine, subtidal and rocky intertidal habitats to available and projected in situ temperature data. This was also undertaken to gauge the local vulnerability of each species across summer and winter in a warm-temperate region of South Africa. This was done using a multi-method physiological approach, which included the dynamic method (CTmax and CTmin), static respirometry and maximum heart rate fHmax). Results of the dynamic method on several fish and macro-invertebrate species indicated that there are differences in thermal tolerance according to taxonomy, biogeography and habitat for both summer and winter. Macro-invertebrate species generally had higher CTmax endpoints, lower CTmin endpoints, higher upper and lower breadths in tolerance, higher upper and lower thermal safety margins and higher thermal scopes than the fish species. This could be a result of the macro-invertebrate species studied being less mobile compared with fish species (which are able to move to more favourable conditions) as well as having broader geographical distributions. In addition, macro-invertebrates from the intertidal rock pool habitat (Palaemon peringueyi; Pernaperna) were more tolerant of high and low temperatures compared with the macro-invertebrates from the estuarine habitat (Clibanarius virescens; Parasesarma catenatum; Upogebia africana). Overall, macro-invertebrates, with the exception of Parechinus angulosus, investigated in this study indicated that current temperatures and projected climate change scenarios across seasons would not have a significant impact on them and that they are highly adaptable to changing temperature regimes. This sign of high tolerance was further supported by the heart rates of P. perna and P. catenatum under an acute increase in temperature (1.0 °C.h-1) which showed individuals of each species physiologically depressing their metabolism until a final Arrhenius breakpoint temperature was reached (TAB). Among the fish species investigated in this study, tropical species (Chaetodon marleyi; Kuhlia mugil) had the highest CTmax and CTmin endpoints when compared with the temperate (Diplodus capensis; Sarpa salpa), warm-water endemic (Chelon dumerili; Rhabdosargus holubi) and cool-water endemic (Chelon richardsonii) fishes. This suggests that due to their lower breadths in tolerance and thermal safety margins being small, tropical species may be less tolerant of cold temperatures and thermal variability, especially in the form of summer upwelling events which are expected to increase in intensity and frequency in this region as a result of anthropogenic climate change effects. On the other hand, however, if a temperature increase of 2.0 - 4.0 °C takes place at the end of the century as predicted by the Intergovernmental Panel on Climate Change (IPCC), it is likely that tropical species such as C. marleyi will become more common. Temperate species such as D. capensis and S. salpa were able to tolerate a wide range of temperatures (wide thermal scope) compared with the other fish species. These findings may suggest that D. capensis and S. salpa are thermally resilient and may be the least vulnerable to climate change effects and temperature variability. When evaluating the different life stages of D. capensis, however, using the dynamic method (juveniles and adults), static respirometry (juveniles) and maximum heart rate (adults), results suggested that juveniles of this temperate species will be more resilient to increases in ocean temperatures compared with the adults because they have a higher thermal tolerance (CTmax/TCRIT) and a greater metabolic scope (TOPT) at higher temperatures. For both juveniles and adults, temperatures beyond 28.0 °C (upper Tpej; Tarr) will have a significant impact on their physiology. Using a multi-scale and multi-method approach thus helped to identify which species or community may be vulnerable to the effects of climate change within shallow coastal environments in this warm-temperate climate change hotspot. Adopting this type of approach will assist policy makers in developing comprehensive climate change management frameworks for coastal ecosystems globally and around South Africa. iii
- Full Text:
- Date Issued: 2020
Sexual attraction and mating compatibility between Thaumatotibia leucotreta populations and implications for semiochemical dependent technologies
- Authors: Upfold, Jennifer Kate
- Date: 2020
- Subjects: Cryptophlebia leucotreta -- South Africa , Cryptophlebia leucotreta -- Reproduction , Citrus -- Disease and pests -- Control -- South Africa , Insect sterilization -- South Africa , Pheromones , Pheromone traps
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/148526 , vital:38747
- Description: False codling moth (FCM), Thaumatotibia leucotreta (Meyrick), is the most important pest for the cultivation of citrus in South Africa. False codling moth is indigenous to southern Africa and is a regulated pest of many international markets for phytosanitary concerns. Considerable research efforts have been invested in the past decades to develop semiochemcial technologies, such as monitoring with sex pheromones, attract-and-kill, mating disruption and the sterile insect technique. One of the potential obstacles identified with semiochemical control is the differences in the ratio of the compounds comprising the sex pheromone at different geographical locations, resulting in what is known as regional attraction. This has been identified in FCM populations from three different countries, however, regional attraction within South African FCM populations was unknown. Therefore, the study assessed the genetic integrity of five laboratory-reared FCM populations originating from geographically isolated populations in South Africa using the AFLP technique in order to assess regional attractiveness within the country. The results found isolated populations from Addo, Citrusdal, Marble Hall, Nelspruit and a fifth group found to be closely related to Addo and Citrusdal called the ‘Old’ colony. These five genetically isolated populations as well as a population from Xsit (Pty) Ltd, used for the sterile insect technique (SIT), were used in regional attractiveness trials. Males were significantly (P = <0.05) more attracted to females originating from the same population. No significant attraction could be determined from the sterile males, as the recapture rates in the trap were too low. Furthermore, regional attractiveness was assessed through choice/ no-choice mating compatibility trials. Significant sexual isolation (ISI) occurred between mating combinations Addo × Nelspruit (ISI = 0,13; t2 = 6.23; p = 0.02), Addo × Marble Hall (ISI = 0,11; t2 = 4.72; p = 0.04), Citrusdal × Nelspruit (ISI = 0,11; t2 = 4.95; p = 0.04), and Citrusdal × Marble Hall (ISI = 0,12; t2 = 4.31; p = 0.04). In these combinations, Addo and Citrusdal males were found to have outcompeted Nelspruit and Marble Hall males for more mating events. Significant sexual isolation was also recorded for Sterile × Marble Hall (ISI = 0.12; t2 = 4.98; p =0.01) and Sterile × Citrusdal (ISI = 0.13; t2 = 3.96; p = 0.01) populations. The male relative performance index was significant in both combinations, indicating that non-sterile laboratory males outcompeted the sterile males in these two combinations. When given no choice, evaluated as spermatophore transfer/ female/ 48h, all males (including sterile) were successful in transferring spermatophores to all FCM populations, with no significant differences. These results indicate that there may be incipient pre-isolation mechanisms affected by local natural selection, resulting in localised sexual attraction via differences in the sex pheromone ratios. These findings provide important information for semiochemical technologies and the implication of these results with regard to monitoring with sex pheromones, attract-and-kill, mating disruption and sterile insect technique are discussed.
- Full Text:
- Date Issued: 2020
- Authors: Upfold, Jennifer Kate
- Date: 2020
- Subjects: Cryptophlebia leucotreta -- South Africa , Cryptophlebia leucotreta -- Reproduction , Citrus -- Disease and pests -- Control -- South Africa , Insect sterilization -- South Africa , Pheromones , Pheromone traps
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/148526 , vital:38747
- Description: False codling moth (FCM), Thaumatotibia leucotreta (Meyrick), is the most important pest for the cultivation of citrus in South Africa. False codling moth is indigenous to southern Africa and is a regulated pest of many international markets for phytosanitary concerns. Considerable research efforts have been invested in the past decades to develop semiochemcial technologies, such as monitoring with sex pheromones, attract-and-kill, mating disruption and the sterile insect technique. One of the potential obstacles identified with semiochemical control is the differences in the ratio of the compounds comprising the sex pheromone at different geographical locations, resulting in what is known as regional attraction. This has been identified in FCM populations from three different countries, however, regional attraction within South African FCM populations was unknown. Therefore, the study assessed the genetic integrity of five laboratory-reared FCM populations originating from geographically isolated populations in South Africa using the AFLP technique in order to assess regional attractiveness within the country. The results found isolated populations from Addo, Citrusdal, Marble Hall, Nelspruit and a fifth group found to be closely related to Addo and Citrusdal called the ‘Old’ colony. These five genetically isolated populations as well as a population from Xsit (Pty) Ltd, used for the sterile insect technique (SIT), were used in regional attractiveness trials. Males were significantly (P = <0.05) more attracted to females originating from the same population. No significant attraction could be determined from the sterile males, as the recapture rates in the trap were too low. Furthermore, regional attractiveness was assessed through choice/ no-choice mating compatibility trials. Significant sexual isolation (ISI) occurred between mating combinations Addo × Nelspruit (ISI = 0,13; t2 = 6.23; p = 0.02), Addo × Marble Hall (ISI = 0,11; t2 = 4.72; p = 0.04), Citrusdal × Nelspruit (ISI = 0,11; t2 = 4.95; p = 0.04), and Citrusdal × Marble Hall (ISI = 0,12; t2 = 4.31; p = 0.04). In these combinations, Addo and Citrusdal males were found to have outcompeted Nelspruit and Marble Hall males for more mating events. Significant sexual isolation was also recorded for Sterile × Marble Hall (ISI = 0.12; t2 = 4.98; p =0.01) and Sterile × Citrusdal (ISI = 0.13; t2 = 3.96; p = 0.01) populations. The male relative performance index was significant in both combinations, indicating that non-sterile laboratory males outcompeted the sterile males in these two combinations. When given no choice, evaluated as spermatophore transfer/ female/ 48h, all males (including sterile) were successful in transferring spermatophores to all FCM populations, with no significant differences. These results indicate that there may be incipient pre-isolation mechanisms affected by local natural selection, resulting in localised sexual attraction via differences in the sex pheromone ratios. These findings provide important information for semiochemical technologies and the implication of these results with regard to monitoring with sex pheromones, attract-and-kill, mating disruption and sterile insect technique are discussed.
- Full Text:
- Date Issued: 2020
The Effects of exchange rates on bilateral trade balances of SACU members states with their trading partners
- Authors: Mhaka, Simbarashe
- Date: 2020
- Subjects: Economic development -- South Africa , Purchasing power parity -- Econometric models
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10948/50371 , vital:42152
- Description: The fluctuations of exchange rates prevent countries from achieving stability in their external account records. Appreciation or depreciation has effects on international trade. This thesis examines the relationship between exchange rate fluctuations on bilateral trade balances focusing on the SACU region. There are several theories made to explain the relationship between exchange rate and trade balances. In examining this phenomenon, this thesis will unveil if the purchasing power parity theory, the Marshall-Lerner condition and the J-curve effect holds in the Southern African Customs Union (SACU) countries. This analysis is divided into three parts. The first part examines the stability of the exchange rate in the SACU countries in the long run as given by the purchasing power parity. To test for the Purchasing Power Parity theory, the recently developed powerful unit root test was applied with multiple smooth structural breaks of Omay (2015), based on a Fractional Frequency Flexible Fourier Form (FFFFF) on unique data of SACU countries covering the monthly period of 1995M01-2017M11. The Purchasing Power Parity (PPP) results show that the nominal effective exchange rate (NEER) of all SACU members does not provide evidence for PPP theory. In terms of the real effective exchange rate (REER), the PPP condition holds in the case of South Africa only. Further unit root investigations were carried out using the panel data for all SACU members, NEER and REER. The FFFFF test results for panel data shows strong evidence of the PPP while the standard DF test rejects PPP theory in the SACU’s NEER. Both the standard DF and the FFFFF tests show strong evidence of PPP theory in the case of SACU’s REER. The second section of the analysis examines the Marshall-Lerner condition employing annual data from the period of 1980-2017. The import and export model were examined firstly in a time series format and then in a panel data format. The time series data was examined using the ARDL (PMG) model while the panel data used the panel ARDL, fully modified OLS (FMOLS) method and the Dynamic OLS (DOLS) method of estimation. The PMG/ARDL model shows no evidence to support the existence of the Marshall-Lerner condition in the short run for all SACU members. However, only two out of five countries show evidence of the Marshall-Lerner condition in the long run. There is strong evidence of the Marshall-Lerner condition in Namibia and Botswana in the long run using the PMG/ARDL model.
- Full Text:
- Date Issued: 2020
- Authors: Mhaka, Simbarashe
- Date: 2020
- Subjects: Economic development -- South Africa , Purchasing power parity -- Econometric models
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10948/50371 , vital:42152
- Description: The fluctuations of exchange rates prevent countries from achieving stability in their external account records. Appreciation or depreciation has effects on international trade. This thesis examines the relationship between exchange rate fluctuations on bilateral trade balances focusing on the SACU region. There are several theories made to explain the relationship between exchange rate and trade balances. In examining this phenomenon, this thesis will unveil if the purchasing power parity theory, the Marshall-Lerner condition and the J-curve effect holds in the Southern African Customs Union (SACU) countries. This analysis is divided into three parts. The first part examines the stability of the exchange rate in the SACU countries in the long run as given by the purchasing power parity. To test for the Purchasing Power Parity theory, the recently developed powerful unit root test was applied with multiple smooth structural breaks of Omay (2015), based on a Fractional Frequency Flexible Fourier Form (FFFFF) on unique data of SACU countries covering the monthly period of 1995M01-2017M11. The Purchasing Power Parity (PPP) results show that the nominal effective exchange rate (NEER) of all SACU members does not provide evidence for PPP theory. In terms of the real effective exchange rate (REER), the PPP condition holds in the case of South Africa only. Further unit root investigations were carried out using the panel data for all SACU members, NEER and REER. The FFFFF test results for panel data shows strong evidence of the PPP while the standard DF test rejects PPP theory in the SACU’s NEER. Both the standard DF and the FFFFF tests show strong evidence of PPP theory in the case of SACU’s REER. The second section of the analysis examines the Marshall-Lerner condition employing annual data from the period of 1980-2017. The import and export model were examined firstly in a time series format and then in a panel data format. The time series data was examined using the ARDL (PMG) model while the panel data used the panel ARDL, fully modified OLS (FMOLS) method and the Dynamic OLS (DOLS) method of estimation. The PMG/ARDL model shows no evidence to support the existence of the Marshall-Lerner condition in the short run for all SACU members. However, only two out of five countries show evidence of the Marshall-Lerner condition in the long run. There is strong evidence of the Marshall-Lerner condition in Namibia and Botswana in the long run using the PMG/ARDL model.
- Full Text:
- Date Issued: 2020
An integrated analytical framework for analysing expansive learning in improved cook stove practice:
- Jalasi, Experencia Madalitso
- Authors: Jalasi, Experencia Madalitso
- Date: 2020
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/149043 , vital:38798 , https://doi.org/10.1016/j.lcsi.2020.100414
- Description: This paper reveals relationships between four analytical frameworks, boundary interaction, reflexivity, transformative agency, and Sannino's reformulated Vygotskian double stimulation model in an Integrated Analytical Framework (IAF) used to analyse expansive learning processes via Boundary Crossing Change Laboratory Workshops in the development of will and volitional actions. I show how transformation emerges from expansive learning processes using two Transformative Pathways in Improved Cook Stove (ICS) practice in Chapita Village case study in Malawi. Introduction of ICSs in the traditional cooking practice generated conflict of motives within subjects of interacting activity systems. I used Cultural Historical Activity Theory (CHAT) to identify and analyse the conflict of motives using socio-cultural historical analysis and analysis of contradictions around learning, promotion, and utilisation of the ICS.
- Full Text:
- Date Issued: 2020
An integrated analytical framework for analysing expansive learning in improved cook stove practice:
- Authors: Jalasi, Experencia Madalitso
- Date: 2020
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/149043 , vital:38798 , https://doi.org/10.1016/j.lcsi.2020.100414
- Description: This paper reveals relationships between four analytical frameworks, boundary interaction, reflexivity, transformative agency, and Sannino's reformulated Vygotskian double stimulation model in an Integrated Analytical Framework (IAF) used to analyse expansive learning processes via Boundary Crossing Change Laboratory Workshops in the development of will and volitional actions. I show how transformation emerges from expansive learning processes using two Transformative Pathways in Improved Cook Stove (ICS) practice in Chapita Village case study in Malawi. Introduction of ICSs in the traditional cooking practice generated conflict of motives within subjects of interacting activity systems. I used Cultural Historical Activity Theory (CHAT) to identify and analyse the conflict of motives using socio-cultural historical analysis and analysis of contradictions around learning, promotion, and utilisation of the ICS.
- Full Text:
- Date Issued: 2020
Rural enterprise development as a means to poverty alleviation
- Authors: Bodley, David Cyril
- Date: 2020
- Subjects: Rural development -- South Africa , Economic development projects -- South Africa Poverty alleviation -- methods -- South Africa
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10948/50361 , vital:42118
- Description: South Africa’s disappointing economic performance over the last decade has resulted in a socio-economic crisis, with unemployment and inequality rates being of the highest rates anywhere in the world. Furthermore, unemployment is concentrated among the young, unskilled, and previously disadvantaged population posing a considerable threat to South Africa’s new democracy. Internationally, a method to absorb job seekers into the economy is to make small business the engine-room of economic growth and development. Consequently, the South African Government has identified in its National Development Plan the establishment of small businesses as a priority, including the development of small businesses in rural and marginalised communities. As rural communities in South Africa experience systemic problems such as the lack of infrastructure, financial capital, skills and potential markets, establishing enterprises in rural settings is often more complex than those more advanced parts of the economy elsewhere where fewer constraints exist. This makes the task of establishing and growing rural entities particularly challenging, suggesting bespoke policy and support is required. This study analyses the literature to gain an understanding of economic development theory and how this intersects with and informs small enterprise development policy. It then looks at South Africa’s strategy and policy framework pertaining to enterprise development. Specifically, the literature examines the role of rural enterprise development to establish whether this enables people to move out of poverty or further entraps people in poverty. The study collates data from a rural and marginalised community through observation and interview techniques. Firstly, multiple in-depth interviews were conducted with nineteen entrepreneurs in a rural community to collect data on business opportunities and explore the type of support entrepreneurs would require from government. Secondly, a focus group interview was conducted with entrepreneurs that had experienced institutional support to understand how well current policy and programmes support rural enterprise development. The primary data was analysed in conjunction with the literature on economic theory and enterprise development using the technique of triangulation to avoid logic leaps and formation of false assumptions. The insights and findings from the analysis reinforced certain facts within the body of knowledge pertaining to enterprise development, but there were also some interesting new insights that emanate from the data. South Africa has been able to introduce a wide range of policy initiatives and has multiple programmes and strategies to support small enterprise development. It has achieved firm success and impetus as well as experiencing certain failures. The study clearly highlights both and makes recommendations to improve policy promoting rural enterprise development as a means to alleviate poverty.
- Full Text:
- Date Issued: 2020
- Authors: Bodley, David Cyril
- Date: 2020
- Subjects: Rural development -- South Africa , Economic development projects -- South Africa Poverty alleviation -- methods -- South Africa
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10948/50361 , vital:42118
- Description: South Africa’s disappointing economic performance over the last decade has resulted in a socio-economic crisis, with unemployment and inequality rates being of the highest rates anywhere in the world. Furthermore, unemployment is concentrated among the young, unskilled, and previously disadvantaged population posing a considerable threat to South Africa’s new democracy. Internationally, a method to absorb job seekers into the economy is to make small business the engine-room of economic growth and development. Consequently, the South African Government has identified in its National Development Plan the establishment of small businesses as a priority, including the development of small businesses in rural and marginalised communities. As rural communities in South Africa experience systemic problems such as the lack of infrastructure, financial capital, skills and potential markets, establishing enterprises in rural settings is often more complex than those more advanced parts of the economy elsewhere where fewer constraints exist. This makes the task of establishing and growing rural entities particularly challenging, suggesting bespoke policy and support is required. This study analyses the literature to gain an understanding of economic development theory and how this intersects with and informs small enterprise development policy. It then looks at South Africa’s strategy and policy framework pertaining to enterprise development. Specifically, the literature examines the role of rural enterprise development to establish whether this enables people to move out of poverty or further entraps people in poverty. The study collates data from a rural and marginalised community through observation and interview techniques. Firstly, multiple in-depth interviews were conducted with nineteen entrepreneurs in a rural community to collect data on business opportunities and explore the type of support entrepreneurs would require from government. Secondly, a focus group interview was conducted with entrepreneurs that had experienced institutional support to understand how well current policy and programmes support rural enterprise development. The primary data was analysed in conjunction with the literature on economic theory and enterprise development using the technique of triangulation to avoid logic leaps and formation of false assumptions. The insights and findings from the analysis reinforced certain facts within the body of knowledge pertaining to enterprise development, but there were also some interesting new insights that emanate from the data. South Africa has been able to introduce a wide range of policy initiatives and has multiple programmes and strategies to support small enterprise development. It has achieved firm success and impetus as well as experiencing certain failures. The study clearly highlights both and makes recommendations to improve policy promoting rural enterprise development as a means to alleviate poverty.
- Full Text:
- Date Issued: 2020
The incorporation of smart production in future factories within the fourth industrial revolution towards 2030
- Authors: Abdoll, Delicia Megan
- Date: 2020
- Subjects: Manufacturing industry
- Language: English
- Type: Thesis , Masters , Degree
- Identifier: http://hdl.handle.net/10948/47521 , vital:40123
- Description: Industry 4.0 is impressively creating a lasting impact on the manufacturing industry and on the industry outlook on the benefits of the implementation of new technology. The concept currently trending entails merging cyber systems, the Internet of Things, and the Internet of Systems all together to construct the revolutionary ‘Smart Factories’. The use of advanced technologies brings about new methodologies to improve the results of manufacturing. Complex activities will be performed by machines equipped in using intelligent information systems and new technology to improve productivity, enhance quality, and reduce costs of manufacturing products. South Africa is at the height of the ‘Fourth Industrial Revolution’ (4IR) which will essentially change the way we work. This innovative rubric of high-tech modernisation is characterised by a merging of technologies from the physical, digital, biological, and neuro-technological spheres. The hesitation over jobs being substituted with co-bots, a robot envisioned to actually cooperate with humans in a communal workplace, is profound. Skills volatility is estimated to affect all industries. There are uncertainties that the underprivileged and non-skilled would be thrust into an even profounder deficiency with the upsurge of the digital age. Organisations regard robotics and modern technology as strategic corporate tools that are utilised to enhance short- and long-term profitability and achieve operating goals. In dissimilarity, the application of robotics and modern technology in the place of work increases labour stability concerns, anxiety of downsizings and terminations within the workforce. The purpose of this research was to heighten the comprehension of smart factories in the manufacturing industry by conclusively embracing a methodical examination of the factors which influence the outlook of those involved concerning smart factory implementation and also of assessing the readiness of the South African manufacturing industry for 4IR towards 2030. The ‘golden thread’ running through the study is the significance of the impact of the 4IR on the workforce and the creation of new jobs for the future, the reskilling of the workforce and the enhancement of capabilities of future factories in embracing the implementation and the incorporation of advanced manufacturing principles in production processes. This must form a substantial consideration in the preparation of the vision of the “Incorporation of smart production in future factories within the fourth industrial revolution towards 2030”. The results of the in-depth analysis of future studies practice and theory in this research study give credibility to the argument that the way in which planning for the future of the 4IR in the South African context is taking place requires insightful adaptation by all stakeholders. The development of new insights through the application of futures studies is vital to this planning process, as is progressively demonstrated in the propensity for present-day business to enable collaborative decisions and strategies that are established on, and informed by, futures studies. This research has attempted to gain insight into the possible future of the implementation of 4IR elements within the future manufacturing factories in South Africa through the creation of four scenarios towards 2030. These are defined as follows: The Fifth Element, which is the ‘best case’ scenario, and to which the country aspires; the ‘worst case’ scenario, in which everything goes badly; the outlier future founded on a surprising, disruptive, emerging matter; and ‘business as usual’ in which no change takes place. The research additionally made efforts to determine the preferred future for the 4IR from a South African perspective, as a base for the Future Vision of the 4IR in the South African manufacturing industry towards 2030. Throughout this study, Inayatullah’s (2008) pillars of futures studies were implemented as a guide in mapping the present and future, further deepening and widening the future through the development of scenarios and, lastly, by transforming the future by narrowing it down to the preferred future. The South African manufacturing sector must select which path to follow in the decisions surrounding the acceptance of the 4IR as the country progresses towards aligning itself with the global players in technology acceptance. Through a unique and innovative approach, the establishment of an atmosphere of trust and the sharing of purpose, values and benefits, a collective Future Vision of the implementing of 4IR elements such as smart production in future factories within South Africa towards 2030, is achievable. All stakeholders must be committed to operating in collaborative partnerships, with government, society, local communities and the workforce all treading boldly together into a sphere of technological, commercial, environmental and social innovation.
- Full Text:
- Date Issued: 2020
- Authors: Abdoll, Delicia Megan
- Date: 2020
- Subjects: Manufacturing industry
- Language: English
- Type: Thesis , Masters , Degree
- Identifier: http://hdl.handle.net/10948/47521 , vital:40123
- Description: Industry 4.0 is impressively creating a lasting impact on the manufacturing industry and on the industry outlook on the benefits of the implementation of new technology. The concept currently trending entails merging cyber systems, the Internet of Things, and the Internet of Systems all together to construct the revolutionary ‘Smart Factories’. The use of advanced technologies brings about new methodologies to improve the results of manufacturing. Complex activities will be performed by machines equipped in using intelligent information systems and new technology to improve productivity, enhance quality, and reduce costs of manufacturing products. South Africa is at the height of the ‘Fourth Industrial Revolution’ (4IR) which will essentially change the way we work. This innovative rubric of high-tech modernisation is characterised by a merging of technologies from the physical, digital, biological, and neuro-technological spheres. The hesitation over jobs being substituted with co-bots, a robot envisioned to actually cooperate with humans in a communal workplace, is profound. Skills volatility is estimated to affect all industries. There are uncertainties that the underprivileged and non-skilled would be thrust into an even profounder deficiency with the upsurge of the digital age. Organisations regard robotics and modern technology as strategic corporate tools that are utilised to enhance short- and long-term profitability and achieve operating goals. In dissimilarity, the application of robotics and modern technology in the place of work increases labour stability concerns, anxiety of downsizings and terminations within the workforce. The purpose of this research was to heighten the comprehension of smart factories in the manufacturing industry by conclusively embracing a methodical examination of the factors which influence the outlook of those involved concerning smart factory implementation and also of assessing the readiness of the South African manufacturing industry for 4IR towards 2030. The ‘golden thread’ running through the study is the significance of the impact of the 4IR on the workforce and the creation of new jobs for the future, the reskilling of the workforce and the enhancement of capabilities of future factories in embracing the implementation and the incorporation of advanced manufacturing principles in production processes. This must form a substantial consideration in the preparation of the vision of the “Incorporation of smart production in future factories within the fourth industrial revolution towards 2030”. The results of the in-depth analysis of future studies practice and theory in this research study give credibility to the argument that the way in which planning for the future of the 4IR in the South African context is taking place requires insightful adaptation by all stakeholders. The development of new insights through the application of futures studies is vital to this planning process, as is progressively demonstrated in the propensity for present-day business to enable collaborative decisions and strategies that are established on, and informed by, futures studies. This research has attempted to gain insight into the possible future of the implementation of 4IR elements within the future manufacturing factories in South Africa through the creation of four scenarios towards 2030. These are defined as follows: The Fifth Element, which is the ‘best case’ scenario, and to which the country aspires; the ‘worst case’ scenario, in which everything goes badly; the outlier future founded on a surprising, disruptive, emerging matter; and ‘business as usual’ in which no change takes place. The research additionally made efforts to determine the preferred future for the 4IR from a South African perspective, as a base for the Future Vision of the 4IR in the South African manufacturing industry towards 2030. Throughout this study, Inayatullah’s (2008) pillars of futures studies were implemented as a guide in mapping the present and future, further deepening and widening the future through the development of scenarios and, lastly, by transforming the future by narrowing it down to the preferred future. The South African manufacturing sector must select which path to follow in the decisions surrounding the acceptance of the 4IR as the country progresses towards aligning itself with the global players in technology acceptance. Through a unique and innovative approach, the establishment of an atmosphere of trust and the sharing of purpose, values and benefits, a collective Future Vision of the implementing of 4IR elements such as smart production in future factories within South Africa towards 2030, is achievable. All stakeholders must be committed to operating in collaborative partnerships, with government, society, local communities and the workforce all treading boldly together into a sphere of technological, commercial, environmental and social innovation.
- Full Text:
- Date Issued: 2020
The establishment and rapid spread of Sagittaria Platyphylla in South Africa:
- Ndlovu, Mpilonhle S, Coetzee, Julie A, Nxumalo, Menzi M, Lalla, Reshnee, Shabalala, Ntombifuthi, Martin, Grant D
- Authors: Ndlovu, Mpilonhle S , Coetzee, Julie A , Nxumalo, Menzi M , Lalla, Reshnee , Shabalala, Ntombifuthi , Martin, Grant D
- Date: 2020
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/149788 , vital:38884 , https://doi.org/10.3390/w12051472
- Description: Sagittaria platyphylla Engelm. (Alismataceae) is a freshwater aquatic macrophyte that has become an important invasive weed in freshwater systems in South Africa, New Zealand, Australia, and recently China. In South Africa, due to its rapid increase in distribution and ineffective control options, it is recognised as one of the country’s worst invasive aquatic alien plants. In this paper, we investigate the spread of the plant since its first detection in 2008, and the management strategies currently carried out against it. Despite early detection and rapid response programmes, which included chemical and mechanical control measures, the plant was able to spread both within and between sites, increasing from just one site in 2008 to 72 by 2019. Once introduced into a lotic system, the plant was able to spread rapidly, in some cases up to 120 km within 6 years, with an average of 10 km per year. The plant was successfully extirpated at some sites, however, due to the failure of chemical and mechanical control, biological control is currently being considered as a potential control option.
- Full Text:
- Date Issued: 2020
- Authors: Ndlovu, Mpilonhle S , Coetzee, Julie A , Nxumalo, Menzi M , Lalla, Reshnee , Shabalala, Ntombifuthi , Martin, Grant D
- Date: 2020
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/149788 , vital:38884 , https://doi.org/10.3390/w12051472
- Description: Sagittaria platyphylla Engelm. (Alismataceae) is a freshwater aquatic macrophyte that has become an important invasive weed in freshwater systems in South Africa, New Zealand, Australia, and recently China. In South Africa, due to its rapid increase in distribution and ineffective control options, it is recognised as one of the country’s worst invasive aquatic alien plants. In this paper, we investigate the spread of the plant since its first detection in 2008, and the management strategies currently carried out against it. Despite early detection and rapid response programmes, which included chemical and mechanical control measures, the plant was able to spread both within and between sites, increasing from just one site in 2008 to 72 by 2019. Once introduced into a lotic system, the plant was able to spread rapidly, in some cases up to 120 km within 6 years, with an average of 10 km per year. The plant was successfully extirpated at some sites, however, due to the failure of chemical and mechanical control, biological control is currently being considered as a potential control option.
- Full Text:
- Date Issued: 2020
A classification of large wetlands in Africa’s elevated drylands based on their formation, structure, and hydrological functioning using Earth Observation (EO) data and Geographic Information System (GIS)
- Authors: Lidzhegu, Zwidofhelangani
- Date: 2020
- Subjects: Wetlands -- Africa -- Classification , Wetlands -- Africa -- Research , Wetlands -- Africa -- Monitoring , Topographical surveying -- Africa , Hydrological surveys == Africa
- Language: English
- Type: text , Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/142668 , vital:38100
- Description: Due to wetland inaccessibility and limited wetland geomorphological studies, there is limited information on the geomorphological origin and hydrological functioning of different types of wetlands in Africa’s elevated drylands. As a result, there is limited information for the development of a comprehensive wetland classification system that classifies wetlands based on long-term geomorphic processes that determine their formation and shape, their structure and hydrological functioning. Therefore, the current study was designed to classify large wetlands in Africa’s elevated drylands based on processes that determine their formation, and shape their structure and hydrological functioning using remote sensing and Geographic Information System (GIS) techniques. Although wetlands perform a number of hydrological functions including groundwater recharge and water purification, the current study focuses mainly on their flood attenuation function. Detailed analysis of topographic information was undertaken using Shuttle Radar Topographic Mission (SRTM) elevations measured at the scale of 30 m x 30 m. LandsatLook and Google Earth images, tectonic as well as geological data were used as supplementary data for developing an understanding of the origin, structure and hydrological characteristics of wetlands. The Principal Component Analysis (PCA) of wetland environmental variables was used to identify and explain wetland heterogeneity. The results of the study showed that fluvial processes, tectonic history and the evolution of Africa’s landscape played a fundamental role in the formation and evolution of wetlands. This study demonstrates a wide range of processes that contribute to wetland formation, structure and functioning. At one extreme it is clear that tectonic processes may be primarily responsible for the creation of basins that host wetlands. At another extreme, wetlands may be structured primarily by fluvial processes. At a third extreme are wetlands that superficially appear to be structured by fluvial processes, but which have their structures modified by gradual rising of the base level at their distal ends, either through marginal uplift adjacent to rift valleys, or through aggradation of a floodplain that blocks a tributary valley. Overall, the classification of wetlands considered in this study can be summarised into four distinct groupings, with two of these divided further into two groupings each: (1) Tectonic basins with little or no indication of fluvial development (Bahi and Wembere wetlands), (2) Tectonic basins evolving towards a wetland with a structure increasingly shaped by fluvial characteristics (Usangu wetland), (3) Fluvially modified valleys with a local base level at the toe of the wetland such as a resistant lithology or a tectonic control that limits the rate of incision of easily weathered and eroded lithologies, leading to valley widening and longitudinal slope reduction, which are of two distinct types: (a) With a catchment on Kalahari Group sediment that is transported fluvially as bedload, and therefore with no prominent alluvial ridge or backwater depressions (Upper Zambezi and Barotse wetlands), (b) With a catchment that produces abundant fine sediment that is deposited as overbank sediments, leading to channel migration via meandering and to the construction of an elevated alluvial ridge (Lufira wetland), (4) Fluvially modified basins with evidence of gradual elevation of the base level at the toe of the wetland, which are of two types: (a) Tectonic marginal rift valley uplift such that they behave more as depression wetlands rather than as wetlands shaped by fluvial processes (Kafue and Luapula wetlands), (b) Tributary valley wetlands blocked by aggradation of the trunk valley (Lukanga wetland). In conclusion, although few geomorphological studies have been conducted on southern African wetlands because of their inaccessibility, Africa’s surface topography and its historical evolution, as well as aridity, provide an opportunity for illustrating the important role that the long-term tectonic, geological and geomorphological processes play in determining wetland origin, structure and dynamics. GIS methodology and Earth Observation (EO) data on the other hand, provide a practical means for acquiring information on inaccessible and hard to traverse wetland systems. A novel cut-and-fill approach for delineating wetlands from a Digital Elevation Model (DEM) was presented as another way in which GIS methodology and Earth Observation (EO) data can provide practical means for assessing inaccessible and hard to traverse wetland systems.
- Full Text:
- Date Issued: 2020
- Authors: Lidzhegu, Zwidofhelangani
- Date: 2020
- Subjects: Wetlands -- Africa -- Classification , Wetlands -- Africa -- Research , Wetlands -- Africa -- Monitoring , Topographical surveying -- Africa , Hydrological surveys == Africa
- Language: English
- Type: text , Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/142668 , vital:38100
- Description: Due to wetland inaccessibility and limited wetland geomorphological studies, there is limited information on the geomorphological origin and hydrological functioning of different types of wetlands in Africa’s elevated drylands. As a result, there is limited information for the development of a comprehensive wetland classification system that classifies wetlands based on long-term geomorphic processes that determine their formation and shape, their structure and hydrological functioning. Therefore, the current study was designed to classify large wetlands in Africa’s elevated drylands based on processes that determine their formation, and shape their structure and hydrological functioning using remote sensing and Geographic Information System (GIS) techniques. Although wetlands perform a number of hydrological functions including groundwater recharge and water purification, the current study focuses mainly on their flood attenuation function. Detailed analysis of topographic information was undertaken using Shuttle Radar Topographic Mission (SRTM) elevations measured at the scale of 30 m x 30 m. LandsatLook and Google Earth images, tectonic as well as geological data were used as supplementary data for developing an understanding of the origin, structure and hydrological characteristics of wetlands. The Principal Component Analysis (PCA) of wetland environmental variables was used to identify and explain wetland heterogeneity. The results of the study showed that fluvial processes, tectonic history and the evolution of Africa’s landscape played a fundamental role in the formation and evolution of wetlands. This study demonstrates a wide range of processes that contribute to wetland formation, structure and functioning. At one extreme it is clear that tectonic processes may be primarily responsible for the creation of basins that host wetlands. At another extreme, wetlands may be structured primarily by fluvial processes. At a third extreme are wetlands that superficially appear to be structured by fluvial processes, but which have their structures modified by gradual rising of the base level at their distal ends, either through marginal uplift adjacent to rift valleys, or through aggradation of a floodplain that blocks a tributary valley. Overall, the classification of wetlands considered in this study can be summarised into four distinct groupings, with two of these divided further into two groupings each: (1) Tectonic basins with little or no indication of fluvial development (Bahi and Wembere wetlands), (2) Tectonic basins evolving towards a wetland with a structure increasingly shaped by fluvial characteristics (Usangu wetland), (3) Fluvially modified valleys with a local base level at the toe of the wetland such as a resistant lithology or a tectonic control that limits the rate of incision of easily weathered and eroded lithologies, leading to valley widening and longitudinal slope reduction, which are of two distinct types: (a) With a catchment on Kalahari Group sediment that is transported fluvially as bedload, and therefore with no prominent alluvial ridge or backwater depressions (Upper Zambezi and Barotse wetlands), (b) With a catchment that produces abundant fine sediment that is deposited as overbank sediments, leading to channel migration via meandering and to the construction of an elevated alluvial ridge (Lufira wetland), (4) Fluvially modified basins with evidence of gradual elevation of the base level at the toe of the wetland, which are of two types: (a) Tectonic marginal rift valley uplift such that they behave more as depression wetlands rather than as wetlands shaped by fluvial processes (Kafue and Luapula wetlands), (b) Tributary valley wetlands blocked by aggradation of the trunk valley (Lukanga wetland). In conclusion, although few geomorphological studies have been conducted on southern African wetlands because of their inaccessibility, Africa’s surface topography and its historical evolution, as well as aridity, provide an opportunity for illustrating the important role that the long-term tectonic, geological and geomorphological processes play in determining wetland origin, structure and dynamics. GIS methodology and Earth Observation (EO) data on the other hand, provide a practical means for acquiring information on inaccessible and hard to traverse wetland systems. A novel cut-and-fill approach for delineating wetlands from a Digital Elevation Model (DEM) was presented as another way in which GIS methodology and Earth Observation (EO) data can provide practical means for assessing inaccessible and hard to traverse wetland systems.
- Full Text:
- Date Issued: 2020
Constructions of United States government development funding in response to the global gag rule
- Molobela, Reabetswe Lee-Anne
- Authors: Molobela, Reabetswe Lee-Anne
- Date: 2020
- Subjects: Pro-choice movement -- South Africa , Abortion -- Law and legislation -- South Africa , Abortion -- Moral and ethical aspects -- South Africa , Abortion -- Psychological aspects , Reproductive rights -- South Africa , Economic assistance, American -- South Africa , Non-governmental organizations -- South Africa , Discourse analysis , Social constructionism , Global Gag Rule
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/148295 , vital:38727
- Description: Despite South Africa’s progressive abortion law, barriers to safe abortion are numerous and exist at both the macro and micro level. Barriers include abortion stigma, discrimination, strong moral judgements against abortion within society and conscientious objection among health care workers. Furthermore, women’s lack of knowledge regarding the legal status of abortion and the voluminous illegal advertisements of back street abortions undermines the legislation and promotes unsafe abortions. Sexual and reproductive health rights (SRHR) non-governmental organizations (NGOs) have served as a link between service and people by providing information about safe abortion to women, especially in rural areas and have received funding from various platforms including United States government. However, the United States government has established the global gag rule which forbids foreign non-governmental organizations receiving United States government funding from using United States government and non-United States funds for abortion related activities. The global gag rule has been reinstated and extended by the current United States president. As such the global gag rule is expected to have an adverse effect on sexual and reproductive health rights in South Africa and on Sexual and reproductive health rights non-governmental organizations. The aim of the study is to highlight the constructions and responses to the global gag rule by sexual and reproductive health rights non-government organization workers in the South African context. This study used semi-structured individual interviews to collect data through purposive and snowball sampling of 10 South African Sexual and reproductive health rights non-governmental organizations workers. The study is situated within the social constructionist framework with emphasis on Fairclough’s three aspects of the constructive effects of discourse as an analytic tool in conjunction with Braun and Clarke’s social constructionist thematic analysis. The results of the study reflect on participants’ construction of United States government as imposing conservative agendas and taking regressive steps towards Sexual and reproductive health rights, which have in turn invoked indirect and direct resistance from non-governmental organizations. Additionally, NGO workers have constructed subject positions that highlight the vulnerability of non-governmental organizations dependency on United States government 1funding as it destabilizes and fragments civil society organization while it compromises the effectiveness of non-governmental organizations in serving the needs of intended communities. United States government is also constructed as strengthening abortion stigma and strengthening barriers to safe abortion that already exist in the country.
- Full Text:
- Date Issued: 2020
- Authors: Molobela, Reabetswe Lee-Anne
- Date: 2020
- Subjects: Pro-choice movement -- South Africa , Abortion -- Law and legislation -- South Africa , Abortion -- Moral and ethical aspects -- South Africa , Abortion -- Psychological aspects , Reproductive rights -- South Africa , Economic assistance, American -- South Africa , Non-governmental organizations -- South Africa , Discourse analysis , Social constructionism , Global Gag Rule
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/148295 , vital:38727
- Description: Despite South Africa’s progressive abortion law, barriers to safe abortion are numerous and exist at both the macro and micro level. Barriers include abortion stigma, discrimination, strong moral judgements against abortion within society and conscientious objection among health care workers. Furthermore, women’s lack of knowledge regarding the legal status of abortion and the voluminous illegal advertisements of back street abortions undermines the legislation and promotes unsafe abortions. Sexual and reproductive health rights (SRHR) non-governmental organizations (NGOs) have served as a link between service and people by providing information about safe abortion to women, especially in rural areas and have received funding from various platforms including United States government. However, the United States government has established the global gag rule which forbids foreign non-governmental organizations receiving United States government funding from using United States government and non-United States funds for abortion related activities. The global gag rule has been reinstated and extended by the current United States president. As such the global gag rule is expected to have an adverse effect on sexual and reproductive health rights in South Africa and on Sexual and reproductive health rights non-governmental organizations. The aim of the study is to highlight the constructions and responses to the global gag rule by sexual and reproductive health rights non-government organization workers in the South African context. This study used semi-structured individual interviews to collect data through purposive and snowball sampling of 10 South African Sexual and reproductive health rights non-governmental organizations workers. The study is situated within the social constructionist framework with emphasis on Fairclough’s three aspects of the constructive effects of discourse as an analytic tool in conjunction with Braun and Clarke’s social constructionist thematic analysis. The results of the study reflect on participants’ construction of United States government as imposing conservative agendas and taking regressive steps towards Sexual and reproductive health rights, which have in turn invoked indirect and direct resistance from non-governmental organizations. Additionally, NGO workers have constructed subject positions that highlight the vulnerability of non-governmental organizations dependency on United States government 1funding as it destabilizes and fragments civil society organization while it compromises the effectiveness of non-governmental organizations in serving the needs of intended communities. United States government is also constructed as strengthening abortion stigma and strengthening barriers to safe abortion that already exist in the country.
- Full Text:
- Date Issued: 2020
Bat species richness and community composition along a mega-transect in the Okavango river basin:
- Weier, Sina M, Keith, Mark, Neef, Götz G, Parker, Daniel M, Taylor, Peter
- Authors: Weier, Sina M , Keith, Mark , Neef, Götz G , Parker, Daniel M , Taylor, Peter
- Date: 2020
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/149264 , vital:38820 , https://doi.org/10.3390/d12050188
- Description: The Okavango River Basin is a hotspot of bat diversity that requires urgent and adequate protection. To advise future conservation strategies, we investigated the relative importance of a range of potential environmental drivers of bat species richness and functional community composition in the Okavango River Basin. During annual canoe transects along the major rivers, originating in the central Angolan highlands, we recorded more than 25,000 bat echolocation calls from 2015 to 2018. We corrected for possible biases in sampling design and effort.
- Full Text:
- Date Issued: 2020
- Authors: Weier, Sina M , Keith, Mark , Neef, Götz G , Parker, Daniel M , Taylor, Peter
- Date: 2020
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/149264 , vital:38820 , https://doi.org/10.3390/d12050188
- Description: The Okavango River Basin is a hotspot of bat diversity that requires urgent and adequate protection. To advise future conservation strategies, we investigated the relative importance of a range of potential environmental drivers of bat species richness and functional community composition in the Okavango River Basin. During annual canoe transects along the major rivers, originating in the central Angolan highlands, we recorded more than 25,000 bat echolocation calls from 2015 to 2018. We corrected for possible biases in sampling design and effort.
- Full Text:
- Date Issued: 2020
The validity of dismissals for refusing to accept changes to terms and conditions of employment
- Authors: Bosch, Lauren
- Date: 2020
- Subjects: Employees -- Dismissal of -- Law and legislation
- Language: English
- Type: Thesis , Masters , LLM
- Identifier: http://hdl.handle.net/10948/47336 , vital:39848
- Description: Operational circumstances often create the need for employers to change the employment conditions of employees. Such conditions can include difficulty in obtaining raw materials which may require employees to do different work, a takeover or a merger, market shifts, orders from clients, an increase or reduction in work volumes, new technology, or even in some instances skill shortages. Regardless of the reason, in order to allow the business to remain operational, employers are often obligated to change terms and conditions of employment. Section 187 of the Labour Relations Act 66 of 1995 deals with automatically unfair dismissals and lists a number of reasons for dismissal that, if it complies with the requirements listed, the dismissal will be found to be automatically unfair. The definition was amended by the Labour Relations Amendment Act 6 of 2014 as a result of the courts incorrectly interpreting this section in Chemical Workers Industrial Union (CWIU) v Algorax (Pty) Limited (2003 11 BLLR 1081) (Algorax) and Fry's Metals (Pty) Limited v National Union of Metal Workers of South Africa and Others (JA9/01) [2002] ZALAC 25 (Fry’s Metals). Section 187(1)(c) of the LRA has always been contentious due to the fact that the definition of automatically unfair dismissals, employers’ rights to terminate contracts of employment on the basis of operational requirements and the institution of collective bargaining are intertwined. The Labour Relations Amendment Act of 2014 brought about significant changes to how section 187(1)(c) should be interpreted and fundamentally changed the enquiry that should be adopted when determining cases of this nature. The main aim of this study is to provide clarity to the question of when will it be valid and fair for an employer, in the course of restructuring his business, to dismiss any of his employees who refuse to accept the proposed changes to the terms and conditions of their employment.
- Full Text:
- Date Issued: 2020
- Authors: Bosch, Lauren
- Date: 2020
- Subjects: Employees -- Dismissal of -- Law and legislation
- Language: English
- Type: Thesis , Masters , LLM
- Identifier: http://hdl.handle.net/10948/47336 , vital:39848
- Description: Operational circumstances often create the need for employers to change the employment conditions of employees. Such conditions can include difficulty in obtaining raw materials which may require employees to do different work, a takeover or a merger, market shifts, orders from clients, an increase or reduction in work volumes, new technology, or even in some instances skill shortages. Regardless of the reason, in order to allow the business to remain operational, employers are often obligated to change terms and conditions of employment. Section 187 of the Labour Relations Act 66 of 1995 deals with automatically unfair dismissals and lists a number of reasons for dismissal that, if it complies with the requirements listed, the dismissal will be found to be automatically unfair. The definition was amended by the Labour Relations Amendment Act 6 of 2014 as a result of the courts incorrectly interpreting this section in Chemical Workers Industrial Union (CWIU) v Algorax (Pty) Limited (2003 11 BLLR 1081) (Algorax) and Fry's Metals (Pty) Limited v National Union of Metal Workers of South Africa and Others (JA9/01) [2002] ZALAC 25 (Fry’s Metals). Section 187(1)(c) of the LRA has always been contentious due to the fact that the definition of automatically unfair dismissals, employers’ rights to terminate contracts of employment on the basis of operational requirements and the institution of collective bargaining are intertwined. The Labour Relations Amendment Act of 2014 brought about significant changes to how section 187(1)(c) should be interpreted and fundamentally changed the enquiry that should be adopted when determining cases of this nature. The main aim of this study is to provide clarity to the question of when will it be valid and fair for an employer, in the course of restructuring his business, to dismiss any of his employees who refuse to accept the proposed changes to the terms and conditions of their employment.
- Full Text:
- Date Issued: 2020
Whatever you say
- Authors: Campbell, Laura
- Date: 2020
- Subjects: South African fiction (English) -- 21st century
- Language: English
- Type: text , Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/140993 , vital:37935
- Description: This document consists of two (2) parts : Part A: Thesis (Creative Work) ; Part B: Portfolio
- Full Text:
- Date Issued: 2020
- Authors: Campbell, Laura
- Date: 2020
- Subjects: South African fiction (English) -- 21st century
- Language: English
- Type: text , Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/140993 , vital:37935
- Description: This document consists of two (2) parts : Part A: Thesis (Creative Work) ; Part B: Portfolio
- Full Text:
- Date Issued: 2020
Investigating visual literacy development through advertisements: a case of Grade 7 English Language Teaching in Mount Frere District, Eastern Cape
- Authors: Mbuqe, Zolile Patrick
- Date: 2020
- Subjects: Visual literacy , English language -- Study and teaching -- Audio-visual aids , Second language acquisition -- South Africa , English language -- Study and teaching -- Activity programs , Advertising -- Study and teaching , Visual learning , English language -- Study and teaching -- South Africa
- Language: English
- Type: text , Thesis , Masters , MEd
- Identifier: http://hdl.handle.net/10962/143458 , vital:38248
- Description: Although the Curriculum and Assessment Policy Statement lists visual literacy as one of the aspects of English First Additional Language in Grades 4-12, many teachers face challenges in teaching it. This study aimed to investigate visual literacy development through advertisements. Drawing on Cultural Historical Activity Theory, this qualitative intervention designed two research phases in which data was collected and analysed. The first phase, a pre-intervention, included lesson observation, analysis of documents and post-lesson semi-structured interviews. Based on Phase One findings and using advertisements as an entry point in developing visual literacy, Phase Two occurred at a change laboratory workshop and engaged eight teachers with the dynamics of meaning making and teaching. This data was analysed using elements of social semiotics and Serafini’s resource practices. The key findings are that despite low visual literacy understanding and practices, rigorous formative intervention indicated advancement in teachers’ understanding of visual literacy. In addition, through this intervention, teachers developed agency in dealing with schooling adversities such as lack of resources and knowledge hence further formative intervention research in visual literacy is recommended for both EFAL subject advisors and teachers.
- Full Text:
- Date Issued: 2020
- Authors: Mbuqe, Zolile Patrick
- Date: 2020
- Subjects: Visual literacy , English language -- Study and teaching -- Audio-visual aids , Second language acquisition -- South Africa , English language -- Study and teaching -- Activity programs , Advertising -- Study and teaching , Visual learning , English language -- Study and teaching -- South Africa
- Language: English
- Type: text , Thesis , Masters , MEd
- Identifier: http://hdl.handle.net/10962/143458 , vital:38248
- Description: Although the Curriculum and Assessment Policy Statement lists visual literacy as one of the aspects of English First Additional Language in Grades 4-12, many teachers face challenges in teaching it. This study aimed to investigate visual literacy development through advertisements. Drawing on Cultural Historical Activity Theory, this qualitative intervention designed two research phases in which data was collected and analysed. The first phase, a pre-intervention, included lesson observation, analysis of documents and post-lesson semi-structured interviews. Based on Phase One findings and using advertisements as an entry point in developing visual literacy, Phase Two occurred at a change laboratory workshop and engaged eight teachers with the dynamics of meaning making and teaching. This data was analysed using elements of social semiotics and Serafini’s resource practices. The key findings are that despite low visual literacy understanding and practices, rigorous formative intervention indicated advancement in teachers’ understanding of visual literacy. In addition, through this intervention, teachers developed agency in dealing with schooling adversities such as lack of resources and knowledge hence further formative intervention research in visual literacy is recommended for both EFAL subject advisors and teachers.
- Full Text:
- Date Issued: 2020
New directions in Maritime and Fisheries Anthropology:
- Authors: Aswani, Shankar
- Date: 2020
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/179028 , vital:40101 , https://0-doi.org.wam.seals.ac.za/10.1111/aman.13380
- Description: Maritime and fisheries anthropology is a mixture of different themes couched under various theoretical frameworks that straddle the humanities and the sciences. In this subject survey, I explore different thematic and theoretical strands of maritime and fisheries anthropology and illustrate broader changes in this subdiscipline since around the mid‐1990s. I also review developing and future thematic and theoretical research frontiers, and discuss their potential contribution to a public and actionable anthropology/scholarship that can better inform fisheries management and conservation. This is important because in the twenty‐first century, coastal peoples are facing socioeconomic and environmental challenges that are increasingly becoming hazardous. To create a more actionable discipline, anthropology needs to be more accessible, inform innovation, and recapture a more pluralistic scholarship that champions interdisciplinary work. This will require the consilience between the humanities and natural sciences for studying human–marine interactions more broadly and for protecting the marine environment.
- Full Text:
- Date Issued: 2020
- Authors: Aswani, Shankar
- Date: 2020
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/179028 , vital:40101 , https://0-doi.org.wam.seals.ac.za/10.1111/aman.13380
- Description: Maritime and fisheries anthropology is a mixture of different themes couched under various theoretical frameworks that straddle the humanities and the sciences. In this subject survey, I explore different thematic and theoretical strands of maritime and fisheries anthropology and illustrate broader changes in this subdiscipline since around the mid‐1990s. I also review developing and future thematic and theoretical research frontiers, and discuss their potential contribution to a public and actionable anthropology/scholarship that can better inform fisheries management and conservation. This is important because in the twenty‐first century, coastal peoples are facing socioeconomic and environmental challenges that are increasingly becoming hazardous. To create a more actionable discipline, anthropology needs to be more accessible, inform innovation, and recapture a more pluralistic scholarship that champions interdisciplinary work. This will require the consilience between the humanities and natural sciences for studying human–marine interactions more broadly and for protecting the marine environment.
- Full Text:
- Date Issued: 2020
“Ntombazana, ugayela bani?”: ubunzululwazi beentsimbi
- Authors: Silo, Tolakele Talitha
- Date: 2020
- Subjects: Beadwork, Xhosa , Xhosa (African people) -- Social life and customs , Beadwork, Tembu , Tembu (African people) -- Social life and customs
- Language: Xhosa
- Type: text , Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/167487 , vital:41485
- Description: “ NTOMBAZANA, UGAYELA BANI?”: UBUNZULULWAZI BEENTSIMBI is a study on the culture of abaThembu, one of the amaXhosa subgroups. Focusing on beadwork as one of this group’s cultural aspects, this research is an initiative to ensure documentation of such indigenous knowledge as an influence on the lifestyle of abaThembu. It also strives to uplift the use of oral literature to present it a fair chance at being a driving force for change as it has previously been ousted with the acceptability of written literature. Of great surprise is to see that despite western civilization, which affected the people’s culture, beadwork remains a pillar of the abaThembu-amaXhosa culture. This craft has evolved and thus, shows no signs of regression. This thesis is an indigenous knowledge focused research.
- Full Text:
- Date Issued: 2020
- Authors: Silo, Tolakele Talitha
- Date: 2020
- Subjects: Beadwork, Xhosa , Xhosa (African people) -- Social life and customs , Beadwork, Tembu , Tembu (African people) -- Social life and customs
- Language: Xhosa
- Type: text , Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/167487 , vital:41485
- Description: “ NTOMBAZANA, UGAYELA BANI?”: UBUNZULULWAZI BEENTSIMBI is a study on the culture of abaThembu, one of the amaXhosa subgroups. Focusing on beadwork as one of this group’s cultural aspects, this research is an initiative to ensure documentation of such indigenous knowledge as an influence on the lifestyle of abaThembu. It also strives to uplift the use of oral literature to present it a fair chance at being a driving force for change as it has previously been ousted with the acceptability of written literature. Of great surprise is to see that despite western civilization, which affected the people’s culture, beadwork remains a pillar of the abaThembu-amaXhosa culture. This craft has evolved and thus, shows no signs of regression. This thesis is an indigenous knowledge focused research.
- Full Text:
- Date Issued: 2020
The weight of a tooth
- Authors: Perros, Robyn Helen
- Date: 2020
- Subjects: South African fiction (English) -- 21st century
- Language: English
- Type: text , Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/144192 , vital:38319
- Description: My thesis is a fragmented, non-linear novella, comprised predominantly of experimental prose- poetry and fiction short-stories. I have chosen this approach in form to further explore my interest in ancestry and trauma, death and image-making, “reality” and fantasy, and the tension these invisible barriers create between the inner and outer worlds in which we simultaneously navigate, remember and forget. This thesis has been influenced both in form and content by the works of Eduardo Galeano, Osama Alomar, Lidia Yuknavitch, Susan Steinberg, Claudia Rankine, Lance Olsen, and Yasunari Kawabata, among others.
- Full Text:
- Date Issued: 2020
- Authors: Perros, Robyn Helen
- Date: 2020
- Subjects: South African fiction (English) -- 21st century
- Language: English
- Type: text , Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/144192 , vital:38319
- Description: My thesis is a fragmented, non-linear novella, comprised predominantly of experimental prose- poetry and fiction short-stories. I have chosen this approach in form to further explore my interest in ancestry and trauma, death and image-making, “reality” and fantasy, and the tension these invisible barriers create between the inner and outer worlds in which we simultaneously navigate, remember and forget. This thesis has been influenced both in form and content by the works of Eduardo Galeano, Osama Alomar, Lidia Yuknavitch, Susan Steinberg, Claudia Rankine, Lance Olsen, and Yasunari Kawabata, among others.
- Full Text:
- Date Issued: 2020
Non-standard employment in terms of the labour relations act
- Authors: Tatchell, Veronique
- Date: 2020
- Subjects: Labor laws and legislation -- South Africa , South Africa -- Labour Relations Act, 1995 , Flexible work arrangements -- South Africa
- Language: English
- Type: Thesis , Masters , LLM
- Identifier: http://hdl.handle.net/10948/49027 , vital:41594
- Description: Historically, employers utilised non-standard or atypical forms of employment in order to avoid statutory obligations in respect of these employees, and in turn justify differential treatment of said employees.1 As a result, non-standard employees were not on the same footing as their permanent counterparts. They were not remunerated on the same level, were not privy to advancement and training opportunities, and did not enjoy a sense of job security due to the ease at which their employment could be terminated, rendering them a vulnerable class of workers.2 There was pandemonium in the employment sphere of society due to the abusive practices faced by employees employed in terms of Temporary Employment Services, this was accompanied by a call to ban labour broking. The legislature, while acknowledging the important role that this form of employment plays in the labour market and broader economy, opted for increased regulation of this and other types of non-standard employment; instead of an outright ban. As a result thereof, the Labour Relations Act3 was amended by the Labour Relations Amendment Act,4 with a view of improving the regulation and protection of employees engaged in these forms of non-standard or atypical employment. This study seeks to determine whether the amendments have achieved the purpose of enhancing the job security of these employees.
- Full Text:
- Date Issued: 2020
- Authors: Tatchell, Veronique
- Date: 2020
- Subjects: Labor laws and legislation -- South Africa , South Africa -- Labour Relations Act, 1995 , Flexible work arrangements -- South Africa
- Language: English
- Type: Thesis , Masters , LLM
- Identifier: http://hdl.handle.net/10948/49027 , vital:41594
- Description: Historically, employers utilised non-standard or atypical forms of employment in order to avoid statutory obligations in respect of these employees, and in turn justify differential treatment of said employees.1 As a result, non-standard employees were not on the same footing as their permanent counterparts. They were not remunerated on the same level, were not privy to advancement and training opportunities, and did not enjoy a sense of job security due to the ease at which their employment could be terminated, rendering them a vulnerable class of workers.2 There was pandemonium in the employment sphere of society due to the abusive practices faced by employees employed in terms of Temporary Employment Services, this was accompanied by a call to ban labour broking. The legislature, while acknowledging the important role that this form of employment plays in the labour market and broader economy, opted for increased regulation of this and other types of non-standard employment; instead of an outright ban. As a result thereof, the Labour Relations Act3 was amended by the Labour Relations Amendment Act,4 with a view of improving the regulation and protection of employees engaged in these forms of non-standard or atypical employment. This study seeks to determine whether the amendments have achieved the purpose of enhancing the job security of these employees.
- Full Text:
- Date Issued: 2020