Facile deposition of gold nanoparticle thin films on semi-permeable cellulose substrate
- Sosibo, Ndabenhle, Mdluli, Phumlani, Mashazi, Philani N, Tshikhudo, Robert, Skepu, Amanda, Vilakazi, Sibulelo, Nyokong, Tebello
- Authors: Sosibo, Ndabenhle , Mdluli, Phumlani , Mashazi, Philani N , Tshikhudo, Robert , Skepu, Amanda , Vilakazi, Sibulelo , Nyokong, Tebello
- Date: 2012
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/242638 , vital:51063 , xlink:href="https://doi.org/10.1016/j.matlet.2012.08.043"
- Description: This study reports the facile method for the deposition of gold nanoparticle thin film onto a monoporous semi-permeable cellulose membrane through the diffusion of borohydride ions leading to the reduction of AuCl4− ions. The synthesis of gold nanoparticle thin film was deposited on one side of the membrane that was exposed to AuCl4− ions while the other side containing a reducing agent remained clear. The gold nanoparticle thin film exhibited a broad surface plasmon resonance (SPR) peak at 529 nm. Various characterization techniques were employed and all demonstrated the presence of gold thin film. The reported method represents a simplistic method for the deposition of gold nanoparticle thin films and various other metal nanoparticles may be deposited following this method.
- Full Text:
- Date Issued: 2012
- Authors: Sosibo, Ndabenhle , Mdluli, Phumlani , Mashazi, Philani N , Tshikhudo, Robert , Skepu, Amanda , Vilakazi, Sibulelo , Nyokong, Tebello
- Date: 2012
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/242638 , vital:51063 , xlink:href="https://doi.org/10.1016/j.matlet.2012.08.043"
- Description: This study reports the facile method for the deposition of gold nanoparticle thin film onto a monoporous semi-permeable cellulose membrane through the diffusion of borohydride ions leading to the reduction of AuCl4− ions. The synthesis of gold nanoparticle thin film was deposited on one side of the membrane that was exposed to AuCl4− ions while the other side containing a reducing agent remained clear. The gold nanoparticle thin film exhibited a broad surface plasmon resonance (SPR) peak at 529 nm. Various characterization techniques were employed and all demonstrated the presence of gold thin film. The reported method represents a simplistic method for the deposition of gold nanoparticle thin films and various other metal nanoparticles may be deposited following this method.
- Full Text:
- Date Issued: 2012
Scientific literacy and education for sustainable development: developing scientific literacy in its fundamental and derived senses
- Authors: Leornard, Samantha Lee
- Date: 2012
- Subjects: Science -- Study and teaching , Science -- Experiments
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:9450 , http://hdl.handle.net/10948/d1010069 , Science -- Study and teaching , Science -- Experiments
- Description: The importance of developing learners’ scientific literacy in both the fundamental and derived senses has been highlighted by Norris & Phillips (2003). Development of the derived sense of science, which is dependent on the development of a sound fundamental sense of science, aims at promoting scientifically literate societies who are able to make informed decisions concerning the natural environment and the promotion of sustainable livelihoods. In turn, response to increasing recognition of environmental degradation, the United Nations’ Decade of Education for Sustainable Development advocated that the principles, values and practices of sustainable development should be integrated into all aspects of education and learning. However, despite these aspirations, the difficulties of insufficient teacher knowledge and a lack of in-service training, both abroad and within South Africa, remain a challenge. In response to this challenge this study investigated the potential of an Integrated Scientific Literacy Strategy (which aimed at increasing in-service teacher knowledge and skills) to contribute to ESD by developing more scientifically literate teachers and learners in primary education. The study was conducted in 2010 in the Port Elizabeth Metropolitan area in the Eastern Cape, South Africa. The study sample comprised seven schools, with a total of nine teachers and 243 learners participating. As the research is situated within the pragmatic paradigm, a mixed methods approach was followed using Creswell and Plano Clark’s (2007) embedded design’s correlational model whereby quantitative data are rooted within a qualitative design to help verify and explain the outcomes. Qualitative measures were generated through teacher interviews and an analysis of their written portfolios. These data were triangulated against quantitative test data gained from an ANCOVA statistical analysis of the learners’ pre- and post-tests, and both the qualitative and quantitative data gleaned from classroom observations and an analysis of the learners’ science notebooks. The data suggest that, when properly implemented, the Integrated Scientific Literacy Strategy can be used to help teachers develop their learners’ scientific literacy by exposing them to open-ended inquiry investigations. Statistically significant differences (p ≤ 0.01; d=0.88) were noted when comparing improvements in learners’ abilities and understandings of scientific investigations (graphs, variables, inquiry and investigable questions) between those learners whose teachers successfully implemented the strategy in their classrooms, and those learners whose teachers were considered to be ‘non-implementers’ of the strategy. Data from this study also suggest that the successful use of the ISLS enables teachers to integrate issues relating to sustainable development into their natural science lessons. In addition, the learner-orientated approach of the strategy also enabled the learners to engage in autonomous learning environments, aspects of which have been identified as being important for meaningfully learning about and internalising important issues related to ESD.
- Full Text:
- Date Issued: 2012
- Authors: Leornard, Samantha Lee
- Date: 2012
- Subjects: Science -- Study and teaching , Science -- Experiments
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:9450 , http://hdl.handle.net/10948/d1010069 , Science -- Study and teaching , Science -- Experiments
- Description: The importance of developing learners’ scientific literacy in both the fundamental and derived senses has been highlighted by Norris & Phillips (2003). Development of the derived sense of science, which is dependent on the development of a sound fundamental sense of science, aims at promoting scientifically literate societies who are able to make informed decisions concerning the natural environment and the promotion of sustainable livelihoods. In turn, response to increasing recognition of environmental degradation, the United Nations’ Decade of Education for Sustainable Development advocated that the principles, values and practices of sustainable development should be integrated into all aspects of education and learning. However, despite these aspirations, the difficulties of insufficient teacher knowledge and a lack of in-service training, both abroad and within South Africa, remain a challenge. In response to this challenge this study investigated the potential of an Integrated Scientific Literacy Strategy (which aimed at increasing in-service teacher knowledge and skills) to contribute to ESD by developing more scientifically literate teachers and learners in primary education. The study was conducted in 2010 in the Port Elizabeth Metropolitan area in the Eastern Cape, South Africa. The study sample comprised seven schools, with a total of nine teachers and 243 learners participating. As the research is situated within the pragmatic paradigm, a mixed methods approach was followed using Creswell and Plano Clark’s (2007) embedded design’s correlational model whereby quantitative data are rooted within a qualitative design to help verify and explain the outcomes. Qualitative measures were generated through teacher interviews and an analysis of their written portfolios. These data were triangulated against quantitative test data gained from an ANCOVA statistical analysis of the learners’ pre- and post-tests, and both the qualitative and quantitative data gleaned from classroom observations and an analysis of the learners’ science notebooks. The data suggest that, when properly implemented, the Integrated Scientific Literacy Strategy can be used to help teachers develop their learners’ scientific literacy by exposing them to open-ended inquiry investigations. Statistically significant differences (p ≤ 0.01; d=0.88) were noted when comparing improvements in learners’ abilities and understandings of scientific investigations (graphs, variables, inquiry and investigable questions) between those learners whose teachers successfully implemented the strategy in their classrooms, and those learners whose teachers were considered to be ‘non-implementers’ of the strategy. Data from this study also suggest that the successful use of the ISLS enables teachers to integrate issues relating to sustainable development into their natural science lessons. In addition, the learner-orientated approach of the strategy also enabled the learners to engage in autonomous learning environments, aspects of which have been identified as being important for meaningfully learning about and internalising important issues related to ESD.
- Full Text:
- Date Issued: 2012
Studies on existing and new isolates of Cryptophlebia leucotreta granulovirus (CrleGV) on Thaumatotibia leucotreta populations from a range of geographic regions in South Africa
- Authors: Opoku-Debrah, John Kwadwo
- Date: 2012
- Subjects: Cryptophlebia leucotreta Cryptophlebia leucotreta -- South Africa Cryptophlebia leucotreta -- Biological control Cryptophlebia leucotreta -- Life cycles Baculoviruses Lepidoptera -- Biological control Tortricidae -- Biological control Microbial insecticides Pests -- Integrated control
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5778 , http://hdl.handle.net/10962/d1005466
- Description: Baculoviruses are arthropod-specific DNA viruses that are highly virulent to most lepidopteran insects. Their host specificity and compatibility with IPM programmes has enabled their usage as safe microbial insecticides (biopesticides). Two baculovirus-based biopesticides, Cryptogran and Cryptex, which have been formulated with Cryptophlebia leucotreta granulovirus (CrleGV) have been registered for the control of false codling moth (FCM), Thaumatotibia (=Cryptophlebia) leucotreta (Meyrick) (Lepidoptera: Tortricidae) in South Africa and have been successfully incorporated into IPM programmes. However, several studies have indicated that insects can develop resistance to baculovirus-based biopesticide as was shown with field populations of codling moth (CM), Cydia pomonella (L.), which developed resistance to the biopesticide Cydia pomonella granulovirus (CpGV-M) in Europe. Other studies have shown that, under laboratory conditions, FCM populations differ in their susceptibility to Cryptogran and Cryptex. In order to investigate difference in susceptibility as well as protect against any future resistance by FCM to Cryptogran and Cryptex, a search for novel CrleGV-SA isolates from diseased insects from different geographic regions in South Africa was performed. Six geographic populations (Addo, Citrusdal, Marble Hall, Nelspruit, Baths and Mixed colonies) of FCM were established and maintained in the laboratory. Studies on the comparative biological performance based on pupal mass, female fecundity, egg hatch, pupal survival, adult eclosion and duration of life cycle of the Addo, Citrusdal, Marble Hall, Nelspruit and Mixed colonies revealed a low biological performance for the Citrusdal colony. This was attributed to the fact that FCM populations found in the Citrusdal area are not indigenous and may have been introduced from a very limited gene pool from another region. When insects from five colonies, excluding the Baths colony, were subjected to stress by overcrowding , a latent baculovirus resident in the Addo, Nelspruit, Citrusdal, Marble Hall and Mixed colonies was brought into an overt lethal state. Transmission electron micrographs revealed the presence of GV occlusion bodies (OBs) in diseased insects. DNA profiles obtained by single restriction endonuclease analysis of viral genomic DNA using BamH 1, Sa/1, Xba1 , Pst1, Xh01 , Kpn1, Hindlll and EcoR1 revealed five CrleGV-SA isolates latent within the insect populations. The new isolates were named CrleGV-SA Ado, CrleGV-SA Cit, CrleGV-SA Mbl, CrleGVSA Nels and CrleGV-SA Mix isolates. The novelty of the five CrleGV-SA isolates was confirmed by the presence of unique submolar bands, indicating that each isolate was genetically different. PCR amplification and sequencing of the granulin and egt genes from the five isolates revealed several single nucleotide polymorph isms (SNPs) which, in some cases, resulted in amino acid substitutions. DNA profiles from RFLPs, as well as phylogenetic analysis based on granulin and egt sequencing showed the presence of two CrleGV-SA genome types for the CrleGV-SA isolate. Cryptex and CrleGV-SA Ado, CrleGV-SA Cit, CrleGV-SA Mbl and CrleGV-SA Mix were placed as members of Group one CrleGV-SA, and Cryptogran and CrleGV-SA Nels isolate were placed into Group two CrleGV-SA. In droplet feeding bioassays, the median survival time (STso) for neonate larvae inoculated with Group one and two CrleGV-SA were determined to range from 80 - 88 hours (3.33 - 3.67 days), for all five colonies. LDso values for Group one and two CrleGV-SA against neonates from the Addo, Citrusdal, Marble Hall, Nelspruit and Mixed colonies varied between some populations and ranged from 0.80 - 3.12 OBs per larva, indicating some level of variation in host susceptibility. This is the first study reporting the existence of genetically distinct CrleGV baculovirus isolates infecting FCM in different geographical areas of South Africa. The results of this study have broad-ranging implications for our understanding of baculovirus-host interactions and for the application of baculovirus basedbiopesticides.
- Full Text:
- Date Issued: 2012
- Authors: Opoku-Debrah, John Kwadwo
- Date: 2012
- Subjects: Cryptophlebia leucotreta Cryptophlebia leucotreta -- South Africa Cryptophlebia leucotreta -- Biological control Cryptophlebia leucotreta -- Life cycles Baculoviruses Lepidoptera -- Biological control Tortricidae -- Biological control Microbial insecticides Pests -- Integrated control
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5778 , http://hdl.handle.net/10962/d1005466
- Description: Baculoviruses are arthropod-specific DNA viruses that are highly virulent to most lepidopteran insects. Their host specificity and compatibility with IPM programmes has enabled their usage as safe microbial insecticides (biopesticides). Two baculovirus-based biopesticides, Cryptogran and Cryptex, which have been formulated with Cryptophlebia leucotreta granulovirus (CrleGV) have been registered for the control of false codling moth (FCM), Thaumatotibia (=Cryptophlebia) leucotreta (Meyrick) (Lepidoptera: Tortricidae) in South Africa and have been successfully incorporated into IPM programmes. However, several studies have indicated that insects can develop resistance to baculovirus-based biopesticide as was shown with field populations of codling moth (CM), Cydia pomonella (L.), which developed resistance to the biopesticide Cydia pomonella granulovirus (CpGV-M) in Europe. Other studies have shown that, under laboratory conditions, FCM populations differ in their susceptibility to Cryptogran and Cryptex. In order to investigate difference in susceptibility as well as protect against any future resistance by FCM to Cryptogran and Cryptex, a search for novel CrleGV-SA isolates from diseased insects from different geographic regions in South Africa was performed. Six geographic populations (Addo, Citrusdal, Marble Hall, Nelspruit, Baths and Mixed colonies) of FCM were established and maintained in the laboratory. Studies on the comparative biological performance based on pupal mass, female fecundity, egg hatch, pupal survival, adult eclosion and duration of life cycle of the Addo, Citrusdal, Marble Hall, Nelspruit and Mixed colonies revealed a low biological performance for the Citrusdal colony. This was attributed to the fact that FCM populations found in the Citrusdal area are not indigenous and may have been introduced from a very limited gene pool from another region. When insects from five colonies, excluding the Baths colony, were subjected to stress by overcrowding , a latent baculovirus resident in the Addo, Nelspruit, Citrusdal, Marble Hall and Mixed colonies was brought into an overt lethal state. Transmission electron micrographs revealed the presence of GV occlusion bodies (OBs) in diseased insects. DNA profiles obtained by single restriction endonuclease analysis of viral genomic DNA using BamH 1, Sa/1, Xba1 , Pst1, Xh01 , Kpn1, Hindlll and EcoR1 revealed five CrleGV-SA isolates latent within the insect populations. The new isolates were named CrleGV-SA Ado, CrleGV-SA Cit, CrleGV-SA Mbl, CrleGVSA Nels and CrleGV-SA Mix isolates. The novelty of the five CrleGV-SA isolates was confirmed by the presence of unique submolar bands, indicating that each isolate was genetically different. PCR amplification and sequencing of the granulin and egt genes from the five isolates revealed several single nucleotide polymorph isms (SNPs) which, in some cases, resulted in amino acid substitutions. DNA profiles from RFLPs, as well as phylogenetic analysis based on granulin and egt sequencing showed the presence of two CrleGV-SA genome types for the CrleGV-SA isolate. Cryptex and CrleGV-SA Ado, CrleGV-SA Cit, CrleGV-SA Mbl and CrleGV-SA Mix were placed as members of Group one CrleGV-SA, and Cryptogran and CrleGV-SA Nels isolate were placed into Group two CrleGV-SA. In droplet feeding bioassays, the median survival time (STso) for neonate larvae inoculated with Group one and two CrleGV-SA were determined to range from 80 - 88 hours (3.33 - 3.67 days), for all five colonies. LDso values for Group one and two CrleGV-SA against neonates from the Addo, Citrusdal, Marble Hall, Nelspruit and Mixed colonies varied between some populations and ranged from 0.80 - 3.12 OBs per larva, indicating some level of variation in host susceptibility. This is the first study reporting the existence of genetically distinct CrleGV baculovirus isolates infecting FCM in different geographical areas of South Africa. The results of this study have broad-ranging implications for our understanding of baculovirus-host interactions and for the application of baculovirus basedbiopesticides.
- Full Text:
- Date Issued: 2012
Electrospun polyacrylic acid polymer fibers functionalized with metallophthalocyanines for photosensitizing and gas sensing applications
- Zugle, Ruphino, Nyokong, Tebello
- Authors: Zugle, Ruphino , Nyokong, Tebello
- Date: 2012
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/243543 , vital:51162 , xlink:href="https://doi.org/10.1080/10601325.2012.662006"
- Description: The photophysical and photochemical properties of tetraaminophthalocyanine complexes of lutetium and zinc covalently linked to polyacrylic acid were studied alongside those of unsubstituted zinc phthalocyanine within the same polymeric fiber matrix. All three phthalocyanines within the solid fiber matrices showed photoactivity by the generation of singlet oxygen as was observed in solution. The fluorescence behaviors of the composite fibers equally parallel those in solution. For the unsubstituted zinc phthalocyanine composite, the fiber showed fluorescence quenching on interaction with gaseous nitrogen dioxide similar to that in DMF and, thus could be a promising nanofabric material in developing optoelectronic devices that are responsive to the gas.
- Full Text:
- Date Issued: 2012
- Authors: Zugle, Ruphino , Nyokong, Tebello
- Date: 2012
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/243543 , vital:51162 , xlink:href="https://doi.org/10.1080/10601325.2012.662006"
- Description: The photophysical and photochemical properties of tetraaminophthalocyanine complexes of lutetium and zinc covalently linked to polyacrylic acid were studied alongside those of unsubstituted zinc phthalocyanine within the same polymeric fiber matrix. All three phthalocyanines within the solid fiber matrices showed photoactivity by the generation of singlet oxygen as was observed in solution. The fluorescence behaviors of the composite fibers equally parallel those in solution. For the unsubstituted zinc phthalocyanine composite, the fiber showed fluorescence quenching on interaction with gaseous nitrogen dioxide similar to that in DMF and, thus could be a promising nanofabric material in developing optoelectronic devices that are responsive to the gas.
- Full Text:
- Date Issued: 2012
Lost in translation: Transformation in the first round of institutional audits
- Authors: McKenna, Sioux , Quinn, Lynn
- Date: 2012
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/187384 , vital:44627 , xlink:href="https://hdl.handle.net/10520/EJC132752"
- Description: The South African higher education institutional audit process was introduced alongside similar endeavors internationally. However, despite many similarities, each country foregrounds different concerns within their higher education quality processes. In their seminal article, Harvey and Green suggest five possible notions of quality, one of which is quality as transformation, and in South Africa the message has been clearly stated: notions of quality are intricately related to transformation. Local research has however suggested that the notion of 'transformation' as quality takes on particular nuances within the country’s context. In the two institutional case studies presented here, the 'quality as transformation' discourse appears to have been largely lost in translation. In one university transformation was not called upon to construct notions of quality; quality was primarily constructed by a discourse of excellence. In the other institution, the transformation aspects of quality seem to have been interpreted in a particularly reductionist way as relating solely to racial demographics. In both cases, this article argues that the 'quality as transformation' discourse prevalent in the audit documentation in the South African context was lost somewhere between the intentions embodied in national documents and the processes embarked upon by institutions.
- Full Text:
- Date Issued: 2012
- Authors: McKenna, Sioux , Quinn, Lynn
- Date: 2012
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/187384 , vital:44627 , xlink:href="https://hdl.handle.net/10520/EJC132752"
- Description: The South African higher education institutional audit process was introduced alongside similar endeavors internationally. However, despite many similarities, each country foregrounds different concerns within their higher education quality processes. In their seminal article, Harvey and Green suggest five possible notions of quality, one of which is quality as transformation, and in South Africa the message has been clearly stated: notions of quality are intricately related to transformation. Local research has however suggested that the notion of 'transformation' as quality takes on particular nuances within the country’s context. In the two institutional case studies presented here, the 'quality as transformation' discourse appears to have been largely lost in translation. In one university transformation was not called upon to construct notions of quality; quality was primarily constructed by a discourse of excellence. In the other institution, the transformation aspects of quality seem to have been interpreted in a particularly reductionist way as relating solely to racial demographics. In both cases, this article argues that the 'quality as transformation' discourse prevalent in the audit documentation in the South African context was lost somewhere between the intentions embodied in national documents and the processes embarked upon by institutions.
- Full Text:
- Date Issued: 2012
A process model for e-voting in South Africa
- Authors: Swanepoel, Eranee
- Date: 2012
- Subjects: Electronic voting -- South Africa
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: vital:9805 , http://hdl.handle.net/10948/d1012588 , Electronic voting -- South Africa
- Description: An election is a core part of any global democracy. Elections provide citizens with the opportunity to voice their opinions. South Africa achieved democracy for the first time in 1994 and has had four successful national elections since then. All of these elections have been declared “free and fair” according to the Independent Electoral Commission (IEC). However, there have been various challenges facing the current South African electoral process. This research, therefore examines alternative methods to improve the current South African electoral process. This research firstly identifies the various challenges and characteristics associated with the current electoral process in South Africa. This research study proposes, to incorporate Information and Communication Technology (ICT) into the South African electoral process. Thus, arguing that utilizing ICT could potentially improve the process. Various countries worldwide have investigated different methods to improve their electoral processes. Countries such as India, Brazil, Estonia and the USA have incorporated ICT into their electoral processes, known as electronic voting (e-voting). Therefore, this research study investigates countries such as India, Brazil, Estonia and the USA which opted to implement e-voting into their electoral process. In addition, various e-voting technologies and their capabilities are explored in detail in this research study. The conclusions drawn from the examination of the electoral processes of countries that utilize e-voting, contributed to the achievement of the primary objective in this research. As a result, to address the various challenges facing the current electoral process in South Africa, a process model was developed called an E-voting Process Model, which depicts two electoral processes namely, an optical scan polling station voting process and an online voting process. This research argues that the E-voting Process Model could potentially improve the current electoral process in South Africa.
- Full Text:
- Date Issued: 2012
- Authors: Swanepoel, Eranee
- Date: 2012
- Subjects: Electronic voting -- South Africa
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: vital:9805 , http://hdl.handle.net/10948/d1012588 , Electronic voting -- South Africa
- Description: An election is a core part of any global democracy. Elections provide citizens with the opportunity to voice their opinions. South Africa achieved democracy for the first time in 1994 and has had four successful national elections since then. All of these elections have been declared “free and fair” according to the Independent Electoral Commission (IEC). However, there have been various challenges facing the current South African electoral process. This research, therefore examines alternative methods to improve the current South African electoral process. This research firstly identifies the various challenges and characteristics associated with the current electoral process in South Africa. This research study proposes, to incorporate Information and Communication Technology (ICT) into the South African electoral process. Thus, arguing that utilizing ICT could potentially improve the process. Various countries worldwide have investigated different methods to improve their electoral processes. Countries such as India, Brazil, Estonia and the USA have incorporated ICT into their electoral processes, known as electronic voting (e-voting). Therefore, this research study investigates countries such as India, Brazil, Estonia and the USA which opted to implement e-voting into their electoral process. In addition, various e-voting technologies and their capabilities are explored in detail in this research study. The conclusions drawn from the examination of the electoral processes of countries that utilize e-voting, contributed to the achievement of the primary objective in this research. As a result, to address the various challenges facing the current electoral process in South Africa, a process model was developed called an E-voting Process Model, which depicts two electoral processes namely, an optical scan polling station voting process and an online voting process. This research argues that the E-voting Process Model could potentially improve the current electoral process in South Africa.
- Full Text:
- Date Issued: 2012
A spatial and temporal analysis of the changes in alien macrophyte communities and a baseline assessment of the macroinvertebrates associated with Eurasian watermilfoil, Myriophyllum spicatum L. (Haloragaceae) in the Vaal River
- Authors: Fordham, Colin Justin
- Date: 2012
- Subjects: Water hyacinth -- Control -- South Africa , Aquatic weeds -- Control -- South Africa , Eurasian watermilfoil -- South Africa , Water quality management -- South Africa , Freshwater invertebrates -- Ecology -- South Africa
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5767 , http://hdl.handle.net/10962/d1005455 , Water hyacinth -- Control -- South Africa , Aquatic weeds -- Control -- South Africa , Eurasian watermilfoil -- South Africa , Water quality management -- South Africa , Freshwater invertebrates -- Ecology -- South Africa
- Description: The majority of South Africa’s fresh water (lotic and lentic), is eutrophic and this has resulted in water hyacinth, Eichhornia crassipes (C.Mart.) Solms. (Pontederiaceae) becoming South Africa’s most damaging aquatic macrophyte. Recently however, concerns have also been voiced over the presence of highly invasive submerged macrophyte species, such as Eurasian water-milfoil, Myriophyllum spicatum L. (Haloragaceae) in the Vaal River. Interaction studies between floating and submerged macrophytes have shown that floating macrophyte dominance restricts light penetration into the water column shading out submerged macrophytes while submerged macrophyte dominance reduces nutrient availability in the water column limiting floating macrophyte growth. This cycle ensures that these species cannot coexist in the same habitat for extended periods of time. The aims of this thesis were to: 1. Investigate changes in the historical and current macrophyte dominance in the Vaal River 2. Determine whether these changes could be attributed to stochastic events, such as floods and herbicide control measures. 3. The physio-chemical conditions of the water column, and whether pressure from herbivory by macroinvertebrates had possibly influenced Eurasian water-milfoil’s ability to dominate. Spatial and temporal analysis of satellite imagery revealed that water hyacinth and submerged macrophyte species dominated different regions of the study area over different periods of time from 2006 to 2010. This was significantly correlated with nitrate concentrations of the water column. One of the lower Vaal River Water Management Areas (WMA) had changed from a water hyacinth dominated state in 2006 to an alternative submerged macrophyte dominated stable state in 2008. It was concluded that this change could be attributed to: a stochastic flooding event in 2006; perturbation from integrated control measures implemented against water hyacinth; and low nitrate concentrations of the WMA. The lack of any substantial macroinvertebrate herbivory pressure or control measures implemented against Eurasian water-milfoil, compared to similar surveys conducted in the U.S.A. and its native range in Eurasia was shown to contribute to its dominance. Future successful integrated control programmes, including biological control against Eurasian water-milfoil, could provide the perturbation required to restore the ecosystem. However, without the reduction in nitrate concentration levels, water hyacinth will remain the dominant stable state of the rest of the Vaal River.
- Full Text:
- Date Issued: 2012
- Authors: Fordham, Colin Justin
- Date: 2012
- Subjects: Water hyacinth -- Control -- South Africa , Aquatic weeds -- Control -- South Africa , Eurasian watermilfoil -- South Africa , Water quality management -- South Africa , Freshwater invertebrates -- Ecology -- South Africa
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5767 , http://hdl.handle.net/10962/d1005455 , Water hyacinth -- Control -- South Africa , Aquatic weeds -- Control -- South Africa , Eurasian watermilfoil -- South Africa , Water quality management -- South Africa , Freshwater invertebrates -- Ecology -- South Africa
- Description: The majority of South Africa’s fresh water (lotic and lentic), is eutrophic and this has resulted in water hyacinth, Eichhornia crassipes (C.Mart.) Solms. (Pontederiaceae) becoming South Africa’s most damaging aquatic macrophyte. Recently however, concerns have also been voiced over the presence of highly invasive submerged macrophyte species, such as Eurasian water-milfoil, Myriophyllum spicatum L. (Haloragaceae) in the Vaal River. Interaction studies between floating and submerged macrophytes have shown that floating macrophyte dominance restricts light penetration into the water column shading out submerged macrophytes while submerged macrophyte dominance reduces nutrient availability in the water column limiting floating macrophyte growth. This cycle ensures that these species cannot coexist in the same habitat for extended periods of time. The aims of this thesis were to: 1. Investigate changes in the historical and current macrophyte dominance in the Vaal River 2. Determine whether these changes could be attributed to stochastic events, such as floods and herbicide control measures. 3. The physio-chemical conditions of the water column, and whether pressure from herbivory by macroinvertebrates had possibly influenced Eurasian water-milfoil’s ability to dominate. Spatial and temporal analysis of satellite imagery revealed that water hyacinth and submerged macrophyte species dominated different regions of the study area over different periods of time from 2006 to 2010. This was significantly correlated with nitrate concentrations of the water column. One of the lower Vaal River Water Management Areas (WMA) had changed from a water hyacinth dominated state in 2006 to an alternative submerged macrophyte dominated stable state in 2008. It was concluded that this change could be attributed to: a stochastic flooding event in 2006; perturbation from integrated control measures implemented against water hyacinth; and low nitrate concentrations of the WMA. The lack of any substantial macroinvertebrate herbivory pressure or control measures implemented against Eurasian water-milfoil, compared to similar surveys conducted in the U.S.A. and its native range in Eurasia was shown to contribute to its dominance. Future successful integrated control programmes, including biological control against Eurasian water-milfoil, could provide the perturbation required to restore the ecosystem. However, without the reduction in nitrate concentration levels, water hyacinth will remain the dominant stable state of the rest of the Vaal River.
- Full Text:
- Date Issued: 2012
Critical design within the practice of graphic design
- Authors: Kuhn, Simon
- Date: 2012
- Subjects: Graphic arts , Product design
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: vital:8494 , http://hdl.handle.net/10948/d1007843 , Graphic arts , Product design
- Description: Critical Design is a specific type of design activity that has emerged from within the field of product design. Based on the supposition that design is an ideological activity, it can either be critical or affirmative of the status quo and categorised as Critical Design or Affirmative Design. The intention of this study is to create Critical Design within the practice of graphic design. Critical Design was defined by identifying its key characteristics and then visualised into a diagram that maps the pathways, processes and consequences which distinguish Critical Design from Affirmative Design. The characteristics were used to generate criteria of Critical Design, which were then used to analyse case studies. The findings from this analysis suggested that both case study projects could be defined as Critical Design and served as a way of testing the appropriateness of the criteria. The practical component of this study used the characteristics of Critical Design to create a range of graphic design artefacts and then analysed them in relation to the criteria of Critical Design. The findings from this analysis determined the practical component as Critical [Graphic] Design and suggested that graphic design can be an appropriate medium for critique of its own role within society.
- Full Text:
- Date Issued: 2012
- Authors: Kuhn, Simon
- Date: 2012
- Subjects: Graphic arts , Product design
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: vital:8494 , http://hdl.handle.net/10948/d1007843 , Graphic arts , Product design
- Description: Critical Design is a specific type of design activity that has emerged from within the field of product design. Based on the supposition that design is an ideological activity, it can either be critical or affirmative of the status quo and categorised as Critical Design or Affirmative Design. The intention of this study is to create Critical Design within the practice of graphic design. Critical Design was defined by identifying its key characteristics and then visualised into a diagram that maps the pathways, processes and consequences which distinguish Critical Design from Affirmative Design. The characteristics were used to generate criteria of Critical Design, which were then used to analyse case studies. The findings from this analysis suggested that both case study projects could be defined as Critical Design and served as a way of testing the appropriateness of the criteria. The practical component of this study used the characteristics of Critical Design to create a range of graphic design artefacts and then analysed them in relation to the criteria of Critical Design. The findings from this analysis determined the practical component as Critical [Graphic] Design and suggested that graphic design can be an appropriate medium for critique of its own role within society.
- Full Text:
- Date Issued: 2012
Using language as a resource: strategies to teach mathematics in multilingual classes
- Authors: Whale, Susan Gaye
- Date: 2012
- Subjects: Mathematics -- Study and teaching (Elementary) -- South Africa , Code switching (Linguistics) -- South Africa , Education, Bilingual -- South Africa -- Eastern Cape , Language and education -- South Africa -- Eastern Cape , Blacks -- Education -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:9469 , http://hdl.handle.net/10948/1669 , Mathematics -- Study and teaching (Elementary) -- South Africa , Code switching (Linguistics) -- South Africa , Education, Bilingual -- South Africa -- Eastern Cape , Language and education -- South Africa -- Eastern Cape , Blacks -- Education -- South Africa -- Eastern Cape
- Description: South Africa is a complex multilingual country. In the majority of schools in the Eastern Cape, a province in South Africa, the teachers and learners share the same home language, isiXhosa, but teach and learn mathematics in English. The purpose of this study was to encourage teachers to use the home language as a resource to teach mathematics in multilingual classes. The study follows a mixed method design, using both qualitative and quantitative data. Qualitative data were collected from a survey and poetry, which teachers crafted, in which they highlighted their perceptions about language in their lives. They also reflected on their practices and submitted pieces of contemplative writing. Quantitative data were collected from participating teachers who administered a pre-test to their learners as well as a post- test approximately nine months later after conducting an intervention. The results showed that where strategies, such as the implementation of exploratory talk and code switching which used language as a resource, had been introduced mathematical reasoning improved and classroom climate became more positive. The learners’ lack of confidence in being able to express their reasoning in English was prevalent throughout the reflective writing. By enabling learners to use isiXhosa in discussions the teachers felt that the learners gained in both confidence and mathematical understanding. This study has demonstrated that using the learners’ and teachers’ home language unlocks doors to communication and spotlights mathematical reasoning, but there is still an urgency to encourage learners to become fluent in Mathematical English. It is important to note that a positive classroom climate is essential for learners to build confidence and to encourage them to attempt to formulate sentences in English - to start on the journey from informal to formal usage of language as advocated by Setati and Adler (2001:250). My main conclusion is that an intervention that develops exploratory talk by using language as a resource can improve learners’ mathematical reasoning. I wish to emphasise that I am not advocating teaching mathematics in isiXhosa only, but the research has shown the advantages of using the home language as a resource together with English in Eastern Cape multilingual mathematics classes. Learners need to be able to express themselves in English, written and spoken, in order to achieve mathematically. This study therefore shows that teachers can gauge their learners’ improvement in mathematical reasoning after an intervention that develops exploratory talk in class by using the home language as a resource.
- Full Text:
- Date Issued: 2012
- Authors: Whale, Susan Gaye
- Date: 2012
- Subjects: Mathematics -- Study and teaching (Elementary) -- South Africa , Code switching (Linguistics) -- South Africa , Education, Bilingual -- South Africa -- Eastern Cape , Language and education -- South Africa -- Eastern Cape , Blacks -- Education -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:9469 , http://hdl.handle.net/10948/1669 , Mathematics -- Study and teaching (Elementary) -- South Africa , Code switching (Linguistics) -- South Africa , Education, Bilingual -- South Africa -- Eastern Cape , Language and education -- South Africa -- Eastern Cape , Blacks -- Education -- South Africa -- Eastern Cape
- Description: South Africa is a complex multilingual country. In the majority of schools in the Eastern Cape, a province in South Africa, the teachers and learners share the same home language, isiXhosa, but teach and learn mathematics in English. The purpose of this study was to encourage teachers to use the home language as a resource to teach mathematics in multilingual classes. The study follows a mixed method design, using both qualitative and quantitative data. Qualitative data were collected from a survey and poetry, which teachers crafted, in which they highlighted their perceptions about language in their lives. They also reflected on their practices and submitted pieces of contemplative writing. Quantitative data were collected from participating teachers who administered a pre-test to their learners as well as a post- test approximately nine months later after conducting an intervention. The results showed that where strategies, such as the implementation of exploratory talk and code switching which used language as a resource, had been introduced mathematical reasoning improved and classroom climate became more positive. The learners’ lack of confidence in being able to express their reasoning in English was prevalent throughout the reflective writing. By enabling learners to use isiXhosa in discussions the teachers felt that the learners gained in both confidence and mathematical understanding. This study has demonstrated that using the learners’ and teachers’ home language unlocks doors to communication and spotlights mathematical reasoning, but there is still an urgency to encourage learners to become fluent in Mathematical English. It is important to note that a positive classroom climate is essential for learners to build confidence and to encourage them to attempt to formulate sentences in English - to start on the journey from informal to formal usage of language as advocated by Setati and Adler (2001:250). My main conclusion is that an intervention that develops exploratory talk by using language as a resource can improve learners’ mathematical reasoning. I wish to emphasise that I am not advocating teaching mathematics in isiXhosa only, but the research has shown the advantages of using the home language as a resource together with English in Eastern Cape multilingual mathematics classes. Learners need to be able to express themselves in English, written and spoken, in order to achieve mathematically. This study therefore shows that teachers can gauge their learners’ improvement in mathematical reasoning after an intervention that develops exploratory talk in class by using the home language as a resource.
- Full Text:
- Date Issued: 2012
Competence development in marine protected area professionals: a case study of the South African Marine Protected Area Management Training Course (SAMPATC)
- Authors: Lewis, Sebastian Giulio
- Date: 2012
- Subjects: Core competencies Employees -- Training of Marine ecosystem management
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1456 , http://hdl.handle.net/10962/d1003337
- Description: This study reviews a training programme on Marine Protected Area (MPA) management. It notes that although MPAs are well promulgated under legislation, reports have found that there are still key challenges facing the management of these areas. The research examines how the course was developed following the Lemm and Attwood (2003) report and designed to develop competences for effective MPA management. The aim is to identify how a MPA management training course produced competences apposite to the workplace settings of the participants. An interpretive case study method was used, in two phases. The first phase explored salient issues in MPA management in South Africa through analysis of the two key ‘state of MPA management’ reports and interviews with MPA professionals. The second was an analysis of the South African Marine Protected Area Management Training Course. This involved interviews with course designers, a review of the course materials, interviews with past course participants, and an analysis of course evaluations. Evidence emerged that supported the following findings: Challenges and problems facing MPA management still exist. Competence in key areas of MPA management was addressed in an effective work-integrated approach. Social learning was a key process in the development of these competences. The competences articulate well with the workplace of participants. Gaps exist between some of the management issues and the competences developed by the course, and some aspects of the course design are ineffective. From these findings it is concluded that: The course took up the majority of issues in MPA management through the development of key competences. The course design facilitated the development of these competences. The competences developed through the course are relevant to the workplace of MPA professionals. The research found that the course adequately addresses issues in MPA management through the development of competences. Some recommendations for improvements are made.
- Full Text:
- Date Issued: 2012
- Authors: Lewis, Sebastian Giulio
- Date: 2012
- Subjects: Core competencies Employees -- Training of Marine ecosystem management
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1456 , http://hdl.handle.net/10962/d1003337
- Description: This study reviews a training programme on Marine Protected Area (MPA) management. It notes that although MPAs are well promulgated under legislation, reports have found that there are still key challenges facing the management of these areas. The research examines how the course was developed following the Lemm and Attwood (2003) report and designed to develop competences for effective MPA management. The aim is to identify how a MPA management training course produced competences apposite to the workplace settings of the participants. An interpretive case study method was used, in two phases. The first phase explored salient issues in MPA management in South Africa through analysis of the two key ‘state of MPA management’ reports and interviews with MPA professionals. The second was an analysis of the South African Marine Protected Area Management Training Course. This involved interviews with course designers, a review of the course materials, interviews with past course participants, and an analysis of course evaluations. Evidence emerged that supported the following findings: Challenges and problems facing MPA management still exist. Competence in key areas of MPA management was addressed in an effective work-integrated approach. Social learning was a key process in the development of these competences. The competences articulate well with the workplace of participants. Gaps exist between some of the management issues and the competences developed by the course, and some aspects of the course design are ineffective. From these findings it is concluded that: The course took up the majority of issues in MPA management through the development of key competences. The course design facilitated the development of these competences. The competences developed through the course are relevant to the workplace of MPA professionals. The research found that the course adequately addresses issues in MPA management through the development of competences. Some recommendations for improvements are made.
- Full Text:
- Date Issued: 2012
Effect of full and semi-scavenging rearing systems on crop contents and the quality of meat from village chickens during spring season of Eastern Cape, South Africa
- Authors: Hanyani, Charles Tawanda
- Date: 2012
- Subjects: Chickens -- Feeding and feeds -- South Africa -- Eastern Cape , Chicken breeds -- South Africa -- Eastern Cape , Meat -- Quality -- South Africa -- Eastern Cape , Forage plants -- South Africa -- Eastern Cape , Crops -- Nutrition -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MSc Agric (Animal Science)
- Identifier: vital:11807 , http://hdl.handle.net/10353/440 , Chickens -- Feeding and feeds -- South Africa -- Eastern Cape , Chicken breeds -- South Africa -- Eastern Cape , Meat -- Quality -- South Africa -- Eastern Cape , Forage plants -- South Africa -- Eastern Cape , Crops -- Nutrition -- South Africa -- Eastern Cape
- Description: The objective of this study was to compare the nutrient status of full scavenging and semi-scavenging village chicken production systems. The semi-scavenging chickens were given broiler finisher mash between 14-24 weeks of age, whilst the full scavenging relied on natural foraging. The study also sought to compare the quality of meat from chickens from the two systems. After slaughtering the chickens, the crop contents were physically separated and analysed for chemical composition. Meat pH and colour were measured on the breast muscle of individual carcasses and a consumer sensory evaluation was also done on the breast muscle. The mean crop content weights per day were significantly higher in full scavenging chickens (±16.7g/day biomass) than in semi-scavenging chickens (±9.14g/day). Dry matter, calcium, and phosphorus levels were higher in the crop contents of the full than in the semi-scavenging chickens but crude protein, crude fibre and metabolisable energy were higher in the latter system. Semi-scavenging (1.3 ± 0.05kg) carcasses were heavier (P<0.05) than full scavenging ones (1.0 ± 0.06kg). The ultimate pH (24h) (pHu) of meat from full scavenging chickens (6.0 ± 0.03) was higher (P<0.05) than that of meat from the semi-scavenging chickens (5.7 ± 0.04). Meat from the full scavenging chickens had higher L* values (60 ± 1.2) than meat from the semi-scavenging chickens (47 ± 0.8). The a* value of meat of full scavenging chickens was significantly (P<0.05) less (4 ± 0.4) than that of meat from semi-scavenging chickens (15 ± 1.3). There was a significant positive (0.60) correlation between pHu and L* of meat from village chickens across rearing systems. The semi-scavenging system meat had better sensory attributes than the meat from the full scavenging system. Female consumers scored the typical flavour of village chicken meat across rearing systems higher (P< 0.05) than male consumers. The Shona consumers scored the meat higher (P< 0.05) than the Xhosa, Zulu, Ndebele and other tribes for initial juiciness, first bite impression and muscle fibre and tenderness of the chicken across rearing systems. Consumers scored of the meat from the semi-scavenging system higher (P<0.05) on initial juiciness (4.3 ± 0.20), first bite impression (4.2 ± 0.197), muscle fibre tenderness (4.5 ± 0.217) than meat from the full scavenging chickens. There were positive correlations (0.46) between aroma intensity and overall flavour intensity across both rearing systems. The semi-scavenging system produced better carcass characteristics, lighter (L*) meat and more consumer acceptable meat than full scavenging chickens. Therefore the full scavenging rearing system had better nutrient composition in its scavenging feed resource base, although the semi-scavenging systems produced chickens with better carcass, meat pH, colour and sensory characteristics than the full scavenging chickens.
- Full Text:
- Date Issued: 2012
- Authors: Hanyani, Charles Tawanda
- Date: 2012
- Subjects: Chickens -- Feeding and feeds -- South Africa -- Eastern Cape , Chicken breeds -- South Africa -- Eastern Cape , Meat -- Quality -- South Africa -- Eastern Cape , Forage plants -- South Africa -- Eastern Cape , Crops -- Nutrition -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MSc Agric (Animal Science)
- Identifier: vital:11807 , http://hdl.handle.net/10353/440 , Chickens -- Feeding and feeds -- South Africa -- Eastern Cape , Chicken breeds -- South Africa -- Eastern Cape , Meat -- Quality -- South Africa -- Eastern Cape , Forage plants -- South Africa -- Eastern Cape , Crops -- Nutrition -- South Africa -- Eastern Cape
- Description: The objective of this study was to compare the nutrient status of full scavenging and semi-scavenging village chicken production systems. The semi-scavenging chickens were given broiler finisher mash between 14-24 weeks of age, whilst the full scavenging relied on natural foraging. The study also sought to compare the quality of meat from chickens from the two systems. After slaughtering the chickens, the crop contents were physically separated and analysed for chemical composition. Meat pH and colour were measured on the breast muscle of individual carcasses and a consumer sensory evaluation was also done on the breast muscle. The mean crop content weights per day were significantly higher in full scavenging chickens (±16.7g/day biomass) than in semi-scavenging chickens (±9.14g/day). Dry matter, calcium, and phosphorus levels were higher in the crop contents of the full than in the semi-scavenging chickens but crude protein, crude fibre and metabolisable energy were higher in the latter system. Semi-scavenging (1.3 ± 0.05kg) carcasses were heavier (P<0.05) than full scavenging ones (1.0 ± 0.06kg). The ultimate pH (24h) (pHu) of meat from full scavenging chickens (6.0 ± 0.03) was higher (P<0.05) than that of meat from the semi-scavenging chickens (5.7 ± 0.04). Meat from the full scavenging chickens had higher L* values (60 ± 1.2) than meat from the semi-scavenging chickens (47 ± 0.8). The a* value of meat of full scavenging chickens was significantly (P<0.05) less (4 ± 0.4) than that of meat from semi-scavenging chickens (15 ± 1.3). There was a significant positive (0.60) correlation between pHu and L* of meat from village chickens across rearing systems. The semi-scavenging system meat had better sensory attributes than the meat from the full scavenging system. Female consumers scored the typical flavour of village chicken meat across rearing systems higher (P< 0.05) than male consumers. The Shona consumers scored the meat higher (P< 0.05) than the Xhosa, Zulu, Ndebele and other tribes for initial juiciness, first bite impression and muscle fibre and tenderness of the chicken across rearing systems. Consumers scored of the meat from the semi-scavenging system higher (P<0.05) on initial juiciness (4.3 ± 0.20), first bite impression (4.2 ± 0.197), muscle fibre tenderness (4.5 ± 0.217) than meat from the full scavenging chickens. There were positive correlations (0.46) between aroma intensity and overall flavour intensity across both rearing systems. The semi-scavenging system produced better carcass characteristics, lighter (L*) meat and more consumer acceptable meat than full scavenging chickens. Therefore the full scavenging rearing system had better nutrient composition in its scavenging feed resource base, although the semi-scavenging systems produced chickens with better carcass, meat pH, colour and sensory characteristics than the full scavenging chickens.
- Full Text:
- Date Issued: 2012
Examining the knowledge and practices of selected Namibian accounting teachers about learner-centred methods of teaching
- Kavari, Jackson-Hain Jakavaza Katjiuanjo
- Authors: Kavari, Jackson-Hain Jakavaza Katjiuanjo
- Date: 2012
- Subjects: Student-centered learning -- Namibia , Accounting -- Study and teaching (Secondary) -- Namibia , Accounting students -- Namibia
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:9520 , http://hdl.handle.net/10948/d1009428 , Student-centered learning -- Namibia , Accounting -- Study and teaching (Secondary) -- Namibia , Accounting students -- Namibia
- Description: Learner-centred education has been in force in all schools in the Republic of Namibia since 1996. Progress towards adoption of learner-centred methods of teaching by teachers has been slow. The main purpose of this study is to examine how teachers understand the principles of learner-centred education in selected Secondary Schools in Omaheke Education Region. The secondary purpose of this study is to determine how teachers could be helped to improve the implementation of learner-centred education (LCE). The study used a qualitative approach. Data were collected from a purposively selected sample of Grade 10 accounting teachers in a specific region in Namibia by means of interviews, classroom observations and a qualitative questionnaire. Data were analysed thematically. The results indicated that, although the teachers had a positive attitude towards learner-centred education, they did not have the skills to adapt their teaching in an appropriate way to cope with the learner‟s lack of English literacy. The teachers possessed basic knowledge of learner-centred education practices, but found it very difficult to implement them in resource-poor environments. In addition, factors that hindered the effective implementation of learner-centred education in the classroom were identified. The study suggests ways to improve the knowledge and practices of teachers with regard to learner-centred teaching practices.
- Full Text:
- Date Issued: 2012
- Authors: Kavari, Jackson-Hain Jakavaza Katjiuanjo
- Date: 2012
- Subjects: Student-centered learning -- Namibia , Accounting -- Study and teaching (Secondary) -- Namibia , Accounting students -- Namibia
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:9520 , http://hdl.handle.net/10948/d1009428 , Student-centered learning -- Namibia , Accounting -- Study and teaching (Secondary) -- Namibia , Accounting students -- Namibia
- Description: Learner-centred education has been in force in all schools in the Republic of Namibia since 1996. Progress towards adoption of learner-centred methods of teaching by teachers has been slow. The main purpose of this study is to examine how teachers understand the principles of learner-centred education in selected Secondary Schools in Omaheke Education Region. The secondary purpose of this study is to determine how teachers could be helped to improve the implementation of learner-centred education (LCE). The study used a qualitative approach. Data were collected from a purposively selected sample of Grade 10 accounting teachers in a specific region in Namibia by means of interviews, classroom observations and a qualitative questionnaire. Data were analysed thematically. The results indicated that, although the teachers had a positive attitude towards learner-centred education, they did not have the skills to adapt their teaching in an appropriate way to cope with the learner‟s lack of English literacy. The teachers possessed basic knowledge of learner-centred education practices, but found it very difficult to implement them in resource-poor environments. In addition, factors that hindered the effective implementation of learner-centred education in the classroom were identified. The study suggests ways to improve the knowledge and practices of teachers with regard to learner-centred teaching practices.
- Full Text:
- Date Issued: 2012
Assesssing small business training programme effectiveness in an incubator setting and beyond
- Authors: Booth-Jones, Laurene
- Date: 2012
- Subjects: Business incubators -- South Africa , Small businesses -- South Africa -- Management , Employees -- Training of , New business enterprises -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: vital:9298 , http://hdl.handle.net/10948/d1014074
- Description: The focus on entrepreneurs as drivers of the economies of nations has catapulted them into the forefront of the local and international marketplace. This has led to a demand for entrepreneurial education and training resulting in a plethora of different and often divergent views. One commonality that has emerged is that entrepreneurship can be taught; although it cannot be taught in conventional and traditional ways. It requires a move from traditional education and training to more enterprising participative and supportive forms of business development. It requires investments of time, resources and support. Incubators are facilities that are engaged with entrepreneurs and offer a variety of support including education and training. This study has assessed the effectiveness of training offered by the Seda Nelson Mandela Bay ICT incubator. There has been limited research undertaken on entrepreneurial education and training in an incubator setting. This study followed the qualitative paradigm. The sample comprised of 10 small businesses at the Seda Nelson Mandela Bay ICT incubator. Empirical data was obtained by interviewing the owners of the small businesses using an interview schedule. Issues such as the most effective training programme, content that it contained, methodology used and quality of the facilitator and applicability of the training programme were explored. The study found that the small businesses were opportunity driven rather than necessity driven and that the incubator served as a bridging facility in moving the businesses from the informal sector to the formal sector. The content of the training programmes was found to be effective when a mix of both theoretical and practical is offered especially with an emphasis on the underlying entrepreneurial themes of confidence, persistence and uncertainty and so on. It also found that training programmes should be linked to the life cycle of the business and address the specific needs of the small business owner. The start-up phase requires very specific training. Most of the facilitators were found to be experienced and empathetic. However, only a few were using a wider range of preferred learning styles favoured by entrepreneurs such as role playing, simulation, brainstorming and problem-solving techniques. The study also found that when generic training programmes are offered there was less recall on the part of the trainees. The management team of the incubator is an important determinant of the success of the incubatees and it is recommended that they need to be well versed in their sector and have good networking skills. There is a strong link between the theoretical and the practical content of training programmes especially where the emphasis is more on the practical content. It is recommended that facilitators pay attention to their relationship with trainees as it is a critical success factor in the training programme. Training programmes offered over a period of time add more value to the incubatee. This might be because of the mentoring and counselling that is available after each training module is completed. Finally, more research needs to be undertaken on the quality and effectiveness of training programmes offered by incubators to small businesses.
- Full Text:
- Date Issued: 2012
- Authors: Booth-Jones, Laurene
- Date: 2012
- Subjects: Business incubators -- South Africa , Small businesses -- South Africa -- Management , Employees -- Training of , New business enterprises -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: vital:9298 , http://hdl.handle.net/10948/d1014074
- Description: The focus on entrepreneurs as drivers of the economies of nations has catapulted them into the forefront of the local and international marketplace. This has led to a demand for entrepreneurial education and training resulting in a plethora of different and often divergent views. One commonality that has emerged is that entrepreneurship can be taught; although it cannot be taught in conventional and traditional ways. It requires a move from traditional education and training to more enterprising participative and supportive forms of business development. It requires investments of time, resources and support. Incubators are facilities that are engaged with entrepreneurs and offer a variety of support including education and training. This study has assessed the effectiveness of training offered by the Seda Nelson Mandela Bay ICT incubator. There has been limited research undertaken on entrepreneurial education and training in an incubator setting. This study followed the qualitative paradigm. The sample comprised of 10 small businesses at the Seda Nelson Mandela Bay ICT incubator. Empirical data was obtained by interviewing the owners of the small businesses using an interview schedule. Issues such as the most effective training programme, content that it contained, methodology used and quality of the facilitator and applicability of the training programme were explored. The study found that the small businesses were opportunity driven rather than necessity driven and that the incubator served as a bridging facility in moving the businesses from the informal sector to the formal sector. The content of the training programmes was found to be effective when a mix of both theoretical and practical is offered especially with an emphasis on the underlying entrepreneurial themes of confidence, persistence and uncertainty and so on. It also found that training programmes should be linked to the life cycle of the business and address the specific needs of the small business owner. The start-up phase requires very specific training. Most of the facilitators were found to be experienced and empathetic. However, only a few were using a wider range of preferred learning styles favoured by entrepreneurs such as role playing, simulation, brainstorming and problem-solving techniques. The study also found that when generic training programmes are offered there was less recall on the part of the trainees. The management team of the incubator is an important determinant of the success of the incubatees and it is recommended that they need to be well versed in their sector and have good networking skills. There is a strong link between the theoretical and the practical content of training programmes especially where the emphasis is more on the practical content. It is recommended that facilitators pay attention to their relationship with trainees as it is a critical success factor in the training programme. Training programmes offered over a period of time add more value to the incubatee. This might be because of the mentoring and counselling that is available after each training module is completed. Finally, more research needs to be undertaken on the quality and effectiveness of training programmes offered by incubators to small businesses.
- Full Text:
- Date Issued: 2012
The impact of motivations, personal values, management skills of managers on the perfomance of SME`s in selected towns (Port Elizabeth and Port Alfred) in the Eastern Cape Province, South Africa
- Authors: Tangwo, Asah Francis
- Date: 2012
- Subjects: Executives -- South Africa -- Eastern Cape , Labor turnover -- South Africa -- Eastern Cape , Organizational commitment -- South Africa -- Eastern Cape , Employee morale -- South Africa -- Eastern Cape , Employee loyalty -- South Africa -- Eastern Cape , Employee motivation -- South Africa -- Eastern Cape , Personalism , Small business -- South Africa -- Eastern Cape , Performance -- Management
- Language: English
- Type: Thesis , Masters , M Com (Business Management)
- Identifier: vital:11320 , http://hdl.handle.net/10353/d1007046 , Executives -- South Africa -- Eastern Cape , Labor turnover -- South Africa -- Eastern Cape , Organizational commitment -- South Africa -- Eastern Cape , Employee morale -- South Africa -- Eastern Cape , Employee loyalty -- South Africa -- Eastern Cape , Employee motivation -- South Africa -- Eastern Cape , Personalism , Small business -- South Africa -- Eastern Cape , Performance -- Management
- Description: This study investigates the impact of motivations, personal values and managerial skills of managers on the performance of Small and medium enterprises (SMEs) in South Africa. The failure rate of SMEs in South Africa is very high and it is of great importance to investigate the factors that can impact on the performance of SMEs. Financial and non-financial methods were used to measure SMEs performance. Data was collected through self-administered questionnaires. Exploratory factor analysis was used to improve the research problems and enhance the validity of the research. Data analysis for this study includes descriptive statistics, Pearson correlation and regression analysis. Reliability was tested using the Cronbach‟s Alpha while validity was ensured by using a statistician and by pre-testing the research instrument in a pilot study.
- Full Text:
- Date Issued: 2012
- Authors: Tangwo, Asah Francis
- Date: 2012
- Subjects: Executives -- South Africa -- Eastern Cape , Labor turnover -- South Africa -- Eastern Cape , Organizational commitment -- South Africa -- Eastern Cape , Employee morale -- South Africa -- Eastern Cape , Employee loyalty -- South Africa -- Eastern Cape , Employee motivation -- South Africa -- Eastern Cape , Personalism , Small business -- South Africa -- Eastern Cape , Performance -- Management
- Language: English
- Type: Thesis , Masters , M Com (Business Management)
- Identifier: vital:11320 , http://hdl.handle.net/10353/d1007046 , Executives -- South Africa -- Eastern Cape , Labor turnover -- South Africa -- Eastern Cape , Organizational commitment -- South Africa -- Eastern Cape , Employee morale -- South Africa -- Eastern Cape , Employee loyalty -- South Africa -- Eastern Cape , Employee motivation -- South Africa -- Eastern Cape , Personalism , Small business -- South Africa -- Eastern Cape , Performance -- Management
- Description: This study investigates the impact of motivations, personal values and managerial skills of managers on the performance of Small and medium enterprises (SMEs) in South Africa. The failure rate of SMEs in South Africa is very high and it is of great importance to investigate the factors that can impact on the performance of SMEs. Financial and non-financial methods were used to measure SMEs performance. Data was collected through self-administered questionnaires. Exploratory factor analysis was used to improve the research problems and enhance the validity of the research. Data analysis for this study includes descriptive statistics, Pearson correlation and regression analysis. Reliability was tested using the Cronbach‟s Alpha while validity was ensured by using a statistician and by pre-testing the research instrument in a pilot study.
- Full Text:
- Date Issued: 2012
Identification of novel marine algal compounds with differential anti-cancer activity: towards a cancer stem-cell specific chemotherapy
- Authors: De la Mare, Jo-Anne
- Date: 2012
- Subjects: Breast -- Cancer , Stem cells -- Research , Chemotherapy , Algae -- Biotechnology
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:4143 , http://hdl.handle.net/10962/d1016250
- Description: Breast cancer remains the leading cause of cancer-related death in women worldwide. Furthermore, it has been demonstrated that the treatment-resistant ER-PR-HER2/neu- sub-type is more common among women of African descent, necessitating the search for novel chemotherapies for this form of the disease. The secondary metabolites produced by marine algae represent a rich source of structurally unique compounds with chemotherapeutic potential, particularly in South Africa, whose oceans allegedly host 15 % of the total number of species in the world. Indeed, a recent study reported the isolation of a range of novel compounds from South African red and brown algae of the Plocamium, Portiera and Sargassum genera which displayed cytotoxicity against oesophageal cancer cells in vitro. The molecular mechanisms mediating this toxicity were unknown, as was the effect of these and similar compounds on metastatic ER-PR-HER2/neu- breast cancer cell lines or breast cancer stem cells. The current study aimed to address these questions by screening a library of twenty-two novel marine algal compounds for the ability to inhibit MDA-MB-231 and Hs578T breast cancer cells, while having no adverse effects on non-cancerous MCF12A breast epithelial cells. While twelve of these were toxic in the micromolar range against breast cancer cells, only the polyhalogenated monoterpenes RU004 and RU007, and the tetraprenylated quinone sargaquinoic acid (SQA) were identified as hit compounds based on the criteria that their cytotoxicity was specific to breast cancer and not healthy breast cells in vitro. On the other hand, the halogenated monoterpene RU015 was found to be highly toxic to both breast cancer and non-cancerous breast cell lines, while the halogenated monoterpene stereoisomers RU017 and RU018 were non-toxic to either of these cell lines. The mode of action of RU004, RU007, RU015 and SQA, together with the previously characterized carotenoid fucoxanthin (FXN), was assessed in terms of the type of cell death induced and the effect on cell cycle distribution of these compounds. Flow cytometric analysis of the extent of Hoescht 33342 and propidium iodide staining along with PARP cleavage studies suggested that SQA induced apoptosis in MDA-MB-231 cells. On the other hand, the highly toxic compound RU015 appeared to induce necrosis as evidenced by 50 kDa PARP cleavage product in MDA-MB-231 cells. The flow cytometry profiles of MDA-MB-231 and Hst578T cells treated with the hit compounds RU004 and RU007 were suggestive of the induction of apoptosis by these compounds. Cell cycle analysis by flow cytometry with propidium iodide staining revealed that both SQA and FXN induced G0-G1 arrest together with an increase in the apoptotic sub-G0 population, which agreed with previous reports in the literature. The molecular mechanism of action of SQA and FXN were further investigated by the identification of specific signal transducer molecules involved in mediating their anti-cancer activities. SQA was found to require the activity of numerous caspases, including caspase-3, -6, -8, -9, -10 and -13, for its cytotoxicity and was demonstrated to decrease the level of the antiapoptotic protein Bcl-2. On the other hand, FXN was shown to require caspase-1, -2, -3, -9 and - 10 for its toxicity. This, together with the ability to decrease the levels of Bcl-2, pointed to the involvement of the intrinsic pathway in particular in mediating the activity of FXN. The screening of algal compounds against non-cancerous breast epithelial cells carried out in this study, together with the investigation into their mechanisms of action, represent one of the few reports in which characterization of algal metabolites goes beyond the initial cytotoxicity assays. Finally, in order to assess the potential anti-cancer stem cell activity of the marine algal compounds, a subset of these was screened using a mammosphere assay technique developed in this study. The cancer stem cell (CSC) theory proposes that cancers arise from and are maintained by a specific subpopulation of cells able to undergo asymmetric cell division and termed CSCs. These CSCs are capable of anchorage-independent growth in serum-free culture conditions, such as those in the mammosphere assay. Using this assay, the novel halogenated monoterpene stereoisomers RU017 and RU018 were demonstrated to possess putative anti- CSC activity as evidenced by their ability to completely eliminate mammosphere formation in vitro. Furthermore, since RU017 and RU018 were non-toxic to both breast cancer and healthy breast cells, it appeared that the activity of the compounds was potentially specific to the CSCs. The results require further validation, but represent the first report of selective anti-CSC activity.
- Full Text:
- Date Issued: 2012
- Authors: De la Mare, Jo-Anne
- Date: 2012
- Subjects: Breast -- Cancer , Stem cells -- Research , Chemotherapy , Algae -- Biotechnology
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:4143 , http://hdl.handle.net/10962/d1016250
- Description: Breast cancer remains the leading cause of cancer-related death in women worldwide. Furthermore, it has been demonstrated that the treatment-resistant ER-PR-HER2/neu- sub-type is more common among women of African descent, necessitating the search for novel chemotherapies for this form of the disease. The secondary metabolites produced by marine algae represent a rich source of structurally unique compounds with chemotherapeutic potential, particularly in South Africa, whose oceans allegedly host 15 % of the total number of species in the world. Indeed, a recent study reported the isolation of a range of novel compounds from South African red and brown algae of the Plocamium, Portiera and Sargassum genera which displayed cytotoxicity against oesophageal cancer cells in vitro. The molecular mechanisms mediating this toxicity were unknown, as was the effect of these and similar compounds on metastatic ER-PR-HER2/neu- breast cancer cell lines or breast cancer stem cells. The current study aimed to address these questions by screening a library of twenty-two novel marine algal compounds for the ability to inhibit MDA-MB-231 and Hs578T breast cancer cells, while having no adverse effects on non-cancerous MCF12A breast epithelial cells. While twelve of these were toxic in the micromolar range against breast cancer cells, only the polyhalogenated monoterpenes RU004 and RU007, and the tetraprenylated quinone sargaquinoic acid (SQA) were identified as hit compounds based on the criteria that their cytotoxicity was specific to breast cancer and not healthy breast cells in vitro. On the other hand, the halogenated monoterpene RU015 was found to be highly toxic to both breast cancer and non-cancerous breast cell lines, while the halogenated monoterpene stereoisomers RU017 and RU018 were non-toxic to either of these cell lines. The mode of action of RU004, RU007, RU015 and SQA, together with the previously characterized carotenoid fucoxanthin (FXN), was assessed in terms of the type of cell death induced and the effect on cell cycle distribution of these compounds. Flow cytometric analysis of the extent of Hoescht 33342 and propidium iodide staining along with PARP cleavage studies suggested that SQA induced apoptosis in MDA-MB-231 cells. On the other hand, the highly toxic compound RU015 appeared to induce necrosis as evidenced by 50 kDa PARP cleavage product in MDA-MB-231 cells. The flow cytometry profiles of MDA-MB-231 and Hst578T cells treated with the hit compounds RU004 and RU007 were suggestive of the induction of apoptosis by these compounds. Cell cycle analysis by flow cytometry with propidium iodide staining revealed that both SQA and FXN induced G0-G1 arrest together with an increase in the apoptotic sub-G0 population, which agreed with previous reports in the literature. The molecular mechanism of action of SQA and FXN were further investigated by the identification of specific signal transducer molecules involved in mediating their anti-cancer activities. SQA was found to require the activity of numerous caspases, including caspase-3, -6, -8, -9, -10 and -13, for its cytotoxicity and was demonstrated to decrease the level of the antiapoptotic protein Bcl-2. On the other hand, FXN was shown to require caspase-1, -2, -3, -9 and - 10 for its toxicity. This, together with the ability to decrease the levels of Bcl-2, pointed to the involvement of the intrinsic pathway in particular in mediating the activity of FXN. The screening of algal compounds against non-cancerous breast epithelial cells carried out in this study, together with the investigation into their mechanisms of action, represent one of the few reports in which characterization of algal metabolites goes beyond the initial cytotoxicity assays. Finally, in order to assess the potential anti-cancer stem cell activity of the marine algal compounds, a subset of these was screened using a mammosphere assay technique developed in this study. The cancer stem cell (CSC) theory proposes that cancers arise from and are maintained by a specific subpopulation of cells able to undergo asymmetric cell division and termed CSCs. These CSCs are capable of anchorage-independent growth in serum-free culture conditions, such as those in the mammosphere assay. Using this assay, the novel halogenated monoterpene stereoisomers RU017 and RU018 were demonstrated to possess putative anti- CSC activity as evidenced by their ability to completely eliminate mammosphere formation in vitro. Furthermore, since RU017 and RU018 were non-toxic to both breast cancer and healthy breast cells, it appeared that the activity of the compounds was potentially specific to the CSCs. The results require further validation, but represent the first report of selective anti-CSC activity.
- Full Text:
- Date Issued: 2012
Strategy implementation: a critical assessment of the application of integrated risk management in the implementation of Eastern Cape Province provincial growth and development strategy (ECPGDS)
- Tshayingca-Mashiya, Nontsikelelo Valencia
- Authors: Tshayingca-Mashiya, Nontsikelelo Valencia
- Date: 2012
- Subjects: Risk assessment -- South Africa -- Eastern Cape -- Growth , Risk assessment -- Development -- South Africa -- Eastern Cape , Strategic planning , Risk management
- Language: English
- Type: Thesis , Doctoral , PhD (in Public Administration)
- Identifier: vital:11678 , http://hdl.handle.net/10353/d1007305 , Risk assessment -- South Africa -- Eastern Cape -- Growth , Risk assessment -- Development -- South Africa -- Eastern Cape , Strategic planning , Risk management
- Description: Strategic Management cycle consist of strategic planning, implementation, monitoring, evaluation and review of strategy. Strategy implementation has thus become the most significant management challenge. Yang et al. (2010) claim that although formulating a consistent strategy is a difficult task for any management team, making that strategy work and implementing it throughout the organisation is even more difficult. Yang further argues that Strategy implementation has been recorded as a key challenge for today’s organisations. According to Gurowitz (2008, there is evidence which shows that less than 10 percent of strategies formulated are effectively executed. Hrebiniak (2005) advances that; failure in organisations to effectively execute strategies is often as a result of limitation in linking organisational goals with objectives (operations). There are many other factors that influence the success of strategy implementation, ranging from the people who communicate or implement the strategy, to the systems or mechanisms in place for co-ordination. Brynard (2005) asserts that strategy implementation is equally challenging for management in Government departments, given that efforts of Government are aimed at improving service delivery. Poor strategy implementation is linked to poor service delivery. It is also worth noting that whilst implementation is acknowledged as a challenge, joint planning and joint implementation policies and strategies experience even a greater challenge in their implementation According to Young (2006), Debra and Yeates (2008), strategy implementation is in itself a risk because of its impact on the processes, people, and the systems. Strategy implementation is thus considered one of the main risk factors in organisations. In concurring with this view, Lorenzi et al. (2008) proposes that, strategy implementation implies change, and therefore poses risk to the processes, the people and the systems.
- Full Text:
- Date Issued: 2012
- Authors: Tshayingca-Mashiya, Nontsikelelo Valencia
- Date: 2012
- Subjects: Risk assessment -- South Africa -- Eastern Cape -- Growth , Risk assessment -- Development -- South Africa -- Eastern Cape , Strategic planning , Risk management
- Language: English
- Type: Thesis , Doctoral , PhD (in Public Administration)
- Identifier: vital:11678 , http://hdl.handle.net/10353/d1007305 , Risk assessment -- South Africa -- Eastern Cape -- Growth , Risk assessment -- Development -- South Africa -- Eastern Cape , Strategic planning , Risk management
- Description: Strategic Management cycle consist of strategic planning, implementation, monitoring, evaluation and review of strategy. Strategy implementation has thus become the most significant management challenge. Yang et al. (2010) claim that although formulating a consistent strategy is a difficult task for any management team, making that strategy work and implementing it throughout the organisation is even more difficult. Yang further argues that Strategy implementation has been recorded as a key challenge for today’s organisations. According to Gurowitz (2008, there is evidence which shows that less than 10 percent of strategies formulated are effectively executed. Hrebiniak (2005) advances that; failure in organisations to effectively execute strategies is often as a result of limitation in linking organisational goals with objectives (operations). There are many other factors that influence the success of strategy implementation, ranging from the people who communicate or implement the strategy, to the systems or mechanisms in place for co-ordination. Brynard (2005) asserts that strategy implementation is equally challenging for management in Government departments, given that efforts of Government are aimed at improving service delivery. Poor strategy implementation is linked to poor service delivery. It is also worth noting that whilst implementation is acknowledged as a challenge, joint planning and joint implementation policies and strategies experience even a greater challenge in their implementation According to Young (2006), Debra and Yeates (2008), strategy implementation is in itself a risk because of its impact on the processes, people, and the systems. Strategy implementation is thus considered one of the main risk factors in organisations. In concurring with this view, Lorenzi et al. (2008) proposes that, strategy implementation implies change, and therefore poses risk to the processes, the people and the systems.
- Full Text:
- Date Issued: 2012
An investigation of media representation of the complexities confronting the concept of the 'Rainbow Nation' as a South African social reality: an analysis of the works of Trevor Noah
- Authors: Magwaza, Isheunesu
- Date: 2012
- Subjects: Noah, Trevor , Mass media -- South Africa , Stand-up comedy -- South Africa , South Africa -- Humor
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:8421 , http://hdl.handle.net/10948/d1015711
- Description: This study is an investigation into the representation of complexities confronting the concept of the Rainbow Nation as a South African social reality. The study is based on the works of Trevor Noah, one of post-Apartheid South Africa‘s eminent stand-up comedians whose two media works, The Day Walker and Crazy Normal, tackle issues pertaining to the socio-political and economic realities that are prevailing in South Africa. The mass media products continue to receive wide acclaim from both, media circles and audiences from racially diversified societies. They are delivered in a mimetic stereotypical manner that cuts across the length and breadth of the South African society. Trevor Noah‘s comedy uses humour to provide the South African society with an opportunity ―[for brutal honesty] to explore, affirm, deny, and ultimately to change its structure and its values‖ (Turner, 1977:33). Representations made in his comedy, more than providing people with a tonic for laughter, also create for the society momentary instances of thought which transcend the theatre stage in which the humour is delivered. Courtesy of these representations, his comedy infiltrates the people‘s sub-consciousness and engages them on those issues pertaining to race-relations and multicultural tolerance which are more often than not trivialised but are influential in shaping the status quo.
- Full Text:
- Date Issued: 2012
- Authors: Magwaza, Isheunesu
- Date: 2012
- Subjects: Noah, Trevor , Mass media -- South Africa , Stand-up comedy -- South Africa , South Africa -- Humor
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:8421 , http://hdl.handle.net/10948/d1015711
- Description: This study is an investigation into the representation of complexities confronting the concept of the Rainbow Nation as a South African social reality. The study is based on the works of Trevor Noah, one of post-Apartheid South Africa‘s eminent stand-up comedians whose two media works, The Day Walker and Crazy Normal, tackle issues pertaining to the socio-political and economic realities that are prevailing in South Africa. The mass media products continue to receive wide acclaim from both, media circles and audiences from racially diversified societies. They are delivered in a mimetic stereotypical manner that cuts across the length and breadth of the South African society. Trevor Noah‘s comedy uses humour to provide the South African society with an opportunity ―[for brutal honesty] to explore, affirm, deny, and ultimately to change its structure and its values‖ (Turner, 1977:33). Representations made in his comedy, more than providing people with a tonic for laughter, also create for the society momentary instances of thought which transcend the theatre stage in which the humour is delivered. Courtesy of these representations, his comedy infiltrates the people‘s sub-consciousness and engages them on those issues pertaining to race-relations and multicultural tolerance which are more often than not trivialised but are influential in shaping the status quo.
- Full Text:
- Date Issued: 2012
Small mammal communities at high altitude within the Sneeuberg Mountain complex, Eastern Cape Province, South Africa
- Authors: Kok, Armand du Preez
- Date: 2012
- Subjects: Mountain animals -- Research -- South Africa -- Eastern Cape , Mammal populations -- Research -- South Africa -- Eastern Cape , Mammals -- Research -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5766 , http://hdl.handle.net/10962/d1005454 , Mountain animals -- Research -- South Africa -- Eastern Cape , Mammal populations -- Research -- South Africa -- Eastern Cape , Mammals -- Research -- South Africa -- Eastern Cape
- Description: Due to their widespread and specious nature, small mammals are ideal for biogeographical studies. Small mammals also effectively connect various trophic levels by being both consumers and prey items for other animals. The Great Escarpment is the dominant mountain landscape in South Africa. Yet, very little small mammal research has been conducted on the Great Escarpment outside of the Main Drakensberg Mountains. This is surprising given the importance of mountains in shaping regional ecology. In this study, I assessed the diversity and community composition of small mammals at three high altitude (>1700m) sites within the Sneeuberg Mountain Complex (SMC) from June 2009 to May 2010. I also tested the effectiveness of five different bait types for measuring small mammal diversity (i.e. number of individuals caught, species richness, Shannon diversity index and Simpson index of diversity). Out of a total of 423 captures, 292 individuals of 12 small mammal species (one shrew, one elephant shrew and 10 rodents) were recorded over 5280 trap nights. The species richness and diversity of small mammals captured at the three sites were similar and this homogeneity was probably related to the regional processes (e.g. climate and latitude) that govern species richness and diversity. The most effective bait type in terms of capture success, species richness and diversity measurements was peanut butter and oats. In addition, the use of richness estimators revealed that peanut butter and oats was the most effective bait for sampling the species richness of small mammals. The effectiveness of peanut butter and oats was related to this bait having a more attractive scent, when compared to the other bait types. Future studies should focus on researching the range of local and regional processes that drive small mammal diversity at high altitudes in South Africa. I also recommend the use of more than one bait type when planning to survey small mammal communities.
- Full Text:
- Date Issued: 2012
- Authors: Kok, Armand du Preez
- Date: 2012
- Subjects: Mountain animals -- Research -- South Africa -- Eastern Cape , Mammal populations -- Research -- South Africa -- Eastern Cape , Mammals -- Research -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5766 , http://hdl.handle.net/10962/d1005454 , Mountain animals -- Research -- South Africa -- Eastern Cape , Mammal populations -- Research -- South Africa -- Eastern Cape , Mammals -- Research -- South Africa -- Eastern Cape
- Description: Due to their widespread and specious nature, small mammals are ideal for biogeographical studies. Small mammals also effectively connect various trophic levels by being both consumers and prey items for other animals. The Great Escarpment is the dominant mountain landscape in South Africa. Yet, very little small mammal research has been conducted on the Great Escarpment outside of the Main Drakensberg Mountains. This is surprising given the importance of mountains in shaping regional ecology. In this study, I assessed the diversity and community composition of small mammals at three high altitude (>1700m) sites within the Sneeuberg Mountain Complex (SMC) from June 2009 to May 2010. I also tested the effectiveness of five different bait types for measuring small mammal diversity (i.e. number of individuals caught, species richness, Shannon diversity index and Simpson index of diversity). Out of a total of 423 captures, 292 individuals of 12 small mammal species (one shrew, one elephant shrew and 10 rodents) were recorded over 5280 trap nights. The species richness and diversity of small mammals captured at the three sites were similar and this homogeneity was probably related to the regional processes (e.g. climate and latitude) that govern species richness and diversity. The most effective bait type in terms of capture success, species richness and diversity measurements was peanut butter and oats. In addition, the use of richness estimators revealed that peanut butter and oats was the most effective bait for sampling the species richness of small mammals. The effectiveness of peanut butter and oats was related to this bait having a more attractive scent, when compared to the other bait types. Future studies should focus on researching the range of local and regional processes that drive small mammal diversity at high altitudes in South Africa. I also recommend the use of more than one bait type when planning to survey small mammal communities.
- Full Text:
- Date Issued: 2012
The credit risk management skills shortage in Nelson Mandela Bay Metropole
- Authors: Teka, Babalwa
- Date: 2012
- Subjects: Banks and banking -- Risk management -- South Africa -- Nelson Mandela Bay Municipality , Credit -- Management , Risk management
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: vital:8834 , http://hdl.handle.net/10948/d1019893
- Description: Tito Mboweni (2011) said one of South Africa’s biggest tests is the overwhelming the skills shortage. He was echoing the views of Higher Education Minister Blade Nzimande who himself said “South Africa could not afford to have an economy "constrained by a severe lack of skills". There are numerous initiatives that having been undertaken by government in an attempt to solve the skills shortage problem. However, these initiatives are not aimed at the tertiary education system. The tertiary education system is the focus of this study as the author investigates how the NMMU Business School can play a significant role in addressing the skills shortage in the credit risk management sector. Following a literature review, surveys were completed by the NMMU Business School MBA students (ninety of them completed it) and personal interviews were conducted with three Provincial HR managers from South Africa’s “four big banks” in Nelson Mandela Bay (Nedbank, Standard Bank and ABSA). The study found that the skills shortage is indeed a problem. The study found that reasons including the legacy left by apartheid and students pursuing the wrong degrees were highlighted as some of the reason for this skills shortage. An opportunity for the NMMU Business School was identified to support the banking industry in addressing credit risk management skills shortage. The benefits include financial reward and more importantly an opportunity to differentiate the Business School and the courses offered at the school from the rest. Some of the recommendations included sourcing of the best practices from institutions like the Millpark Business School on effective partnering with the banking industry as well as a proactive approach to be adopted by the banking industry in terms of lobbying support from other potential role players for example but not limited to, student bodies, BankSeta and the smaller banks in the industry.
- Full Text:
- Date Issued: 2012
- Authors: Teka, Babalwa
- Date: 2012
- Subjects: Banks and banking -- Risk management -- South Africa -- Nelson Mandela Bay Municipality , Credit -- Management , Risk management
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: vital:8834 , http://hdl.handle.net/10948/d1019893
- Description: Tito Mboweni (2011) said one of South Africa’s biggest tests is the overwhelming the skills shortage. He was echoing the views of Higher Education Minister Blade Nzimande who himself said “South Africa could not afford to have an economy "constrained by a severe lack of skills". There are numerous initiatives that having been undertaken by government in an attempt to solve the skills shortage problem. However, these initiatives are not aimed at the tertiary education system. The tertiary education system is the focus of this study as the author investigates how the NMMU Business School can play a significant role in addressing the skills shortage in the credit risk management sector. Following a literature review, surveys were completed by the NMMU Business School MBA students (ninety of them completed it) and personal interviews were conducted with three Provincial HR managers from South Africa’s “four big banks” in Nelson Mandela Bay (Nedbank, Standard Bank and ABSA). The study found that the skills shortage is indeed a problem. The study found that reasons including the legacy left by apartheid and students pursuing the wrong degrees were highlighted as some of the reason for this skills shortage. An opportunity for the NMMU Business School was identified to support the banking industry in addressing credit risk management skills shortage. The benefits include financial reward and more importantly an opportunity to differentiate the Business School and the courses offered at the school from the rest. Some of the recommendations included sourcing of the best practices from institutions like the Millpark Business School on effective partnering with the banking industry as well as a proactive approach to be adopted by the banking industry in terms of lobbying support from other potential role players for example but not limited to, student bodies, BankSeta and the smaller banks in the industry.
- Full Text:
- Date Issued: 2012
Can sport impact rational investor behaviour? : an evaluation of the impact of national sporting performance on stock market returns in South Africa
- Authors: De Beer, Carl Francois
- Date: 2012
- Subjects: Investments -- Psychological aspects -- Research -- South Africa Finance -- Psychological aspects -- Research -- South Africa Sports -- Economic aspects -- Research -- South Africa Sports -- Psychological aspects -- Research -- South Africa
- Language: English
- Type: Thesis , Masters , MEcon
- Identifier: vital:1013 , http://hdl.handle.net/10962/d1002748
- Description: The finance industry is an extremely fast and complex world dominated by the Efficient Markets Hypothesis (EMH). This theory contains many assumptions which include that investors are rational utility maximisers and that market prices reflect all relevant economic information available to the public. However, over the years, a new form of financial literature known as behavioural finance has been gaining momentum. Behavioural finance seeks to bridge the gap between psychology and economics in an attempt to gain a better understanding of how markets react to different situations. Behavioural finance has also gained much attention in recent years due to the EMH’s inability to explain many economic anomalies. This study first considers the differences between behavioural finance theory and EMH theory before explaining how an individual’s mood has the ability to influence one’s risk taking preferences. Mood changes were also found to be linked to changes in the way an individual reacts to different situations, the way they thinks and processes thoughts. Negative events were also found to have a greater influence on an individual’s mood than positive events did, resulting in an asymmetric relationship between positive and negative results. This study then examines numerous studies indicating how non-economic events can have a statistical and significant influence on stock market returns before analysing previous literature where sport was found to influence market prices. The aim of this study is to determine if South African national sporting performance can influence investors in such a way that it has the ability to impact on market returns. Using standard event study methodology, this study determines the constant mean return using the daily All-Share price index on the JSE for the period of 1 January 1990 to 31 December 2010. This study focuses on three of South Africa’s most popular sports, namely soccer, cricket and rugby and examine if these three sports have the ability to influence market returns. Although there is some evidence of a relationship between stock returns and sporting performance in the descriptive analysis, the regression results indicate that sporting performance in South Africa does not significantly explain abnormal market returns on the JSE. The study provides a number of possible reasons for this finding and concludes by suggesting areas for future research.
- Full Text:
- Date Issued: 2012
- Authors: De Beer, Carl Francois
- Date: 2012
- Subjects: Investments -- Psychological aspects -- Research -- South Africa Finance -- Psychological aspects -- Research -- South Africa Sports -- Economic aspects -- Research -- South Africa Sports -- Psychological aspects -- Research -- South Africa
- Language: English
- Type: Thesis , Masters , MEcon
- Identifier: vital:1013 , http://hdl.handle.net/10962/d1002748
- Description: The finance industry is an extremely fast and complex world dominated by the Efficient Markets Hypothesis (EMH). This theory contains many assumptions which include that investors are rational utility maximisers and that market prices reflect all relevant economic information available to the public. However, over the years, a new form of financial literature known as behavioural finance has been gaining momentum. Behavioural finance seeks to bridge the gap between psychology and economics in an attempt to gain a better understanding of how markets react to different situations. Behavioural finance has also gained much attention in recent years due to the EMH’s inability to explain many economic anomalies. This study first considers the differences between behavioural finance theory and EMH theory before explaining how an individual’s mood has the ability to influence one’s risk taking preferences. Mood changes were also found to be linked to changes in the way an individual reacts to different situations, the way they thinks and processes thoughts. Negative events were also found to have a greater influence on an individual’s mood than positive events did, resulting in an asymmetric relationship between positive and negative results. This study then examines numerous studies indicating how non-economic events can have a statistical and significant influence on stock market returns before analysing previous literature where sport was found to influence market prices. The aim of this study is to determine if South African national sporting performance can influence investors in such a way that it has the ability to impact on market returns. Using standard event study methodology, this study determines the constant mean return using the daily All-Share price index on the JSE for the period of 1 January 1990 to 31 December 2010. This study focuses on three of South Africa’s most popular sports, namely soccer, cricket and rugby and examine if these three sports have the ability to influence market returns. Although there is some evidence of a relationship between stock returns and sporting performance in the descriptive analysis, the regression results indicate that sporting performance in South Africa does not significantly explain abnormal market returns on the JSE. The study provides a number of possible reasons for this finding and concludes by suggesting areas for future research.
- Full Text:
- Date Issued: 2012