Constructing a web of culture: the case of akKOORd, an Overberg community choir
- Authors: Jacobs, Sunell Human
- Date: 2010
- Subjects: Choral music -- South Africa -- Overberg , Choirs (Music) , Overberg (South Africa) -- History , City and town life -- Social aspects
- Language: English
- Type: Thesis , Masters , MMus
- Identifier: vital:8506 , http://hdl.handle.net/10948/1254 , Choral music -- South Africa -- Overberg , Choirs (Music) , Overberg (South Africa) -- History , City and town life -- Social aspects
- Description: akKOORd, a community choir in the relatively small southern region of the Overberg, was formed in 2006, and although the choir has only a brief history, its spirit, activities, and concerts have inspired and touched many people. This qualitative study pays attention to aspects of the choir’s history, its performance practice and of the “web” of community members connected to and involved in its activities. Through interviews and personal notes this in-depth study provides a “micronarrative” of this choir within the “web” of the Overberg community itself. It aims to not only interpret this narrative with regard to the meaning behind actions and their symbolic importance in society, but also to explore its relevance in the broader context of current South African cultural discourse. During this research it became evident that policy makers and potential funders regard this predominantly white choir with its Western repertoire as a form of undesirable exclusivity and elitism. This study opposes such a point of view, contending instead that elitism in the form of excellence has the power to defy barriers of social standing and ethnicity, and to unite people through a collective sense of ownership.
- Full Text:
- Date Issued: 2010
- Authors: Jacobs, Sunell Human
- Date: 2010
- Subjects: Choral music -- South Africa -- Overberg , Choirs (Music) , Overberg (South Africa) -- History , City and town life -- Social aspects
- Language: English
- Type: Thesis , Masters , MMus
- Identifier: vital:8506 , http://hdl.handle.net/10948/1254 , Choral music -- South Africa -- Overberg , Choirs (Music) , Overberg (South Africa) -- History , City and town life -- Social aspects
- Description: akKOORd, a community choir in the relatively small southern region of the Overberg, was formed in 2006, and although the choir has only a brief history, its spirit, activities, and concerts have inspired and touched many people. This qualitative study pays attention to aspects of the choir’s history, its performance practice and of the “web” of community members connected to and involved in its activities. Through interviews and personal notes this in-depth study provides a “micronarrative” of this choir within the “web” of the Overberg community itself. It aims to not only interpret this narrative with regard to the meaning behind actions and their symbolic importance in society, but also to explore its relevance in the broader context of current South African cultural discourse. During this research it became evident that policy makers and potential funders regard this predominantly white choir with its Western repertoire as a form of undesirable exclusivity and elitism. This study opposes such a point of view, contending instead that elitism in the form of excellence has the power to defy barriers of social standing and ethnicity, and to unite people through a collective sense of ownership.
- Full Text:
- Date Issued: 2010
The botanical importance and health of the Bushmans estuary, Eastern Cape, South Africa
- Authors: Jafta, Nolusindiso
- Date: 2010
- Subjects: Estuaries -- South Africa , Bushmans river estuary , Estuarine ecology -- South Africa
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:10614 , http://hdl.handle.net/10948/1255 , Estuaries -- South Africa , Bushmans river estuary , Estuarine ecology -- South Africa
- Description: The Bushmans Estuary is one of the few permanently open estuaries in the Eastern Cape that is characterized by large intertidal salt marshes. Freshwater inflow to the estuary has decreased as a result of abstraction by more than 30 weirs and farm dams in the catchment. The mean annual run-off is naturally low (38 x 106 m3 y-1) and thus abstraction and reduction of freshwater inflow to the estuary is expected to cause a number of changes. The aims of this study were to determine the current health/status of the estuary based on the macrophytes and microalgae and identify monitoring indicators for the East London Department of Water Affairs, River Health Programme. Changes in the estuary over time were determined from available historical data which were compared with present data. This analysis showed that under normal average conditions freshwater inflow to the estuary is very low, less that 0.02 m3 s-1 most of the time. Under these conditions the estuary is in a homogenous marine state. Vertical and horizontal salinity gradients only form when high rainfall and run-off occurs (> 5 m3.s-1). Salinity gradients from 30.1 PSU at the mouth to 2.2 PSU in the upper reaches were measured in 2006 after a high flow event. However the estuary quickly reverted back to its homogenous condition within weeks after this flood. This study showed that freshwater inflow increased nutrient input to the estuary. Total oxidised nitrogen (TOxN) and soluble reactive phosphorus (SRP) concentrations were higher in August 2006, after the flood, than during the other low flow sampling sessions. TOxN decreased from a mean concentration of 21.6 μM in 2006 to 1.93 μM in February 2009. SRP decreased from 55.3 μM to 0.2 μM respectively. With the increased nutrient availability, the response in the estuary was an increase in phytoplankton biomass. After the 2006 floods the average water column chlorophyll-a was 9.0 μg l-1, while in the low freshwater inflow years it ranged from 2.1 to 4.8 μg l-1. The composition of the phytoplankton community was always dominated by flagellates and then diatoms, with higher cell numbers in the nutrient-enriched 2006 period. Although the water column nutrient data indicated that the estuary was oligotrophic, benthic microalgal biomass (11.9-16.1 μg.g-1) in the intertidal zone was comparable with nutrient rich estuaries. Benthic species indicative of polluted conditions were found (Nitzschia frustulum, Navicula gregaria, Navicula cryptotenelloides). These benthic species were found at the sites where wastewater / sewage seepage had occurred. Benthic diatom species also indicated freshwater inflow. During the high flow period in 2006 the dominant diatoms were fresh to brackish species that were strongly associated with the high concentrations of TOxN and SRP (Tryblionella constricta, Diploneis smithii, Hippodonta cf. gremainii, and Navicula species). During the freshwater limited period of 2008 and 2009 the benthic diatom species shifted to a group responding to the high salinity, ammonium and silicate concentrations. The species in this group were Nitzschia flexa, Navicula tenneloides, Diploneis elliptica, Amphora subacutiuscula and Nitzschia coarctata. Ordination results showed that the epiphytic diatom species responded to different environmental variables in the different years. Most of the species in 2008/2009 were associated with high salinity, temperature, dissolved oxygen, ammonium and silicate concentrations while the response was towards TOxN and SRP in 2006. The dominant species were Cocconeis placentula v euglyphyta in 2006; Nitzschia frustulum in 2008; and Synedra spp in 2009. The average biomass of the epiphytes was significantly lower in May 2008 than in both August 2006 and February 2009; 88.0 + 17.7 mg.m-2, 1.7 + 0.8 mg.m-2, and 61.8 + 14.4 mg.m-2 respectively. GIS mapping of past and present aerial photographs showed that submerged macrophyte (Zostera capensis) cover in 1966 and 1973 was less than that mapped for 2004. Salt marsh also increased its cover over time, from 86.9 ha in 1966 to 126 ha in 2004, colonizing what were bare sandy areas. Long-term monitoring of the health of the Bushmans Estuary should focus on salinity (as an indicator of inflow or deprivation of freshwater), benthic diatom identification and macrophyte distribution and composition (for the detection of pollution input), and bathymetric surveys (for shallowing of the estuary due to sedimentation).
- Full Text:
- Date Issued: 2010
- Authors: Jafta, Nolusindiso
- Date: 2010
- Subjects: Estuaries -- South Africa , Bushmans river estuary , Estuarine ecology -- South Africa
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:10614 , http://hdl.handle.net/10948/1255 , Estuaries -- South Africa , Bushmans river estuary , Estuarine ecology -- South Africa
- Description: The Bushmans Estuary is one of the few permanently open estuaries in the Eastern Cape that is characterized by large intertidal salt marshes. Freshwater inflow to the estuary has decreased as a result of abstraction by more than 30 weirs and farm dams in the catchment. The mean annual run-off is naturally low (38 x 106 m3 y-1) and thus abstraction and reduction of freshwater inflow to the estuary is expected to cause a number of changes. The aims of this study were to determine the current health/status of the estuary based on the macrophytes and microalgae and identify monitoring indicators for the East London Department of Water Affairs, River Health Programme. Changes in the estuary over time were determined from available historical data which were compared with present data. This analysis showed that under normal average conditions freshwater inflow to the estuary is very low, less that 0.02 m3 s-1 most of the time. Under these conditions the estuary is in a homogenous marine state. Vertical and horizontal salinity gradients only form when high rainfall and run-off occurs (> 5 m3.s-1). Salinity gradients from 30.1 PSU at the mouth to 2.2 PSU in the upper reaches were measured in 2006 after a high flow event. However the estuary quickly reverted back to its homogenous condition within weeks after this flood. This study showed that freshwater inflow increased nutrient input to the estuary. Total oxidised nitrogen (TOxN) and soluble reactive phosphorus (SRP) concentrations were higher in August 2006, after the flood, than during the other low flow sampling sessions. TOxN decreased from a mean concentration of 21.6 μM in 2006 to 1.93 μM in February 2009. SRP decreased from 55.3 μM to 0.2 μM respectively. With the increased nutrient availability, the response in the estuary was an increase in phytoplankton biomass. After the 2006 floods the average water column chlorophyll-a was 9.0 μg l-1, while in the low freshwater inflow years it ranged from 2.1 to 4.8 μg l-1. The composition of the phytoplankton community was always dominated by flagellates and then diatoms, with higher cell numbers in the nutrient-enriched 2006 period. Although the water column nutrient data indicated that the estuary was oligotrophic, benthic microalgal biomass (11.9-16.1 μg.g-1) in the intertidal zone was comparable with nutrient rich estuaries. Benthic species indicative of polluted conditions were found (Nitzschia frustulum, Navicula gregaria, Navicula cryptotenelloides). These benthic species were found at the sites where wastewater / sewage seepage had occurred. Benthic diatom species also indicated freshwater inflow. During the high flow period in 2006 the dominant diatoms were fresh to brackish species that were strongly associated with the high concentrations of TOxN and SRP (Tryblionella constricta, Diploneis smithii, Hippodonta cf. gremainii, and Navicula species). During the freshwater limited period of 2008 and 2009 the benthic diatom species shifted to a group responding to the high salinity, ammonium and silicate concentrations. The species in this group were Nitzschia flexa, Navicula tenneloides, Diploneis elliptica, Amphora subacutiuscula and Nitzschia coarctata. Ordination results showed that the epiphytic diatom species responded to different environmental variables in the different years. Most of the species in 2008/2009 were associated with high salinity, temperature, dissolved oxygen, ammonium and silicate concentrations while the response was towards TOxN and SRP in 2006. The dominant species were Cocconeis placentula v euglyphyta in 2006; Nitzschia frustulum in 2008; and Synedra spp in 2009. The average biomass of the epiphytes was significantly lower in May 2008 than in both August 2006 and February 2009; 88.0 + 17.7 mg.m-2, 1.7 + 0.8 mg.m-2, and 61.8 + 14.4 mg.m-2 respectively. GIS mapping of past and present aerial photographs showed that submerged macrophyte (Zostera capensis) cover in 1966 and 1973 was less than that mapped for 2004. Salt marsh also increased its cover over time, from 86.9 ha in 1966 to 126 ha in 2004, colonizing what were bare sandy areas. Long-term monitoring of the health of the Bushmans Estuary should focus on salinity (as an indicator of inflow or deprivation of freshwater), benthic diatom identification and macrophyte distribution and composition (for the detection of pollution input), and bathymetric surveys (for shallowing of the estuary due to sedimentation).
- Full Text:
- Date Issued: 2010
An investigation of the role of selected ward committees in enhancing basic service delivery: the case of Buffalo City Municipality
- Jakatyana, Xolile Christopher
- Authors: Jakatyana, Xolile Christopher
- Date: 2010
- Subjects: Buffalo City (South Africa) , Local government -- South Africa -- Buffalo City -- Citizen participation , Municipal government -- South Africa -- Buffalo City -- Citizen participation , Municipal services -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MPA
- Identifier: vital:8201 , http://hdl.handle.net/10948/1256 , Buffalo City (South Africa) , Local government -- South Africa -- Buffalo City -- Citizen participation , Municipal government -- South Africa -- Buffalo City -- Citizen participation , Municipal services -- South Africa -- Eastern Cape
- Description: This study investigated the role of selected ward committees 29 and 32 of Nompumelelo and Tsholomnqa respectively in the Buffalo City Municipality (BCM) in enhancing basic service delivery. In terms of the White Paper on Local Government (1998:4), developmental local government promotes a system that centres on working with local communities to find sustainable ways to meet their needs and improve the quality of their lives. The study on that basis examines the nature and extent to which wards 29 and 32 committees enhanced basic service delivery within BCM. The study is premised on the assumptions that: The involvement of party-elected Councillors in ward committees inhibits members of ward committees from playing an active role in their communities; Ward committees are not clearly communicating municipality programmes to their communities; BCM is biased in favour of urban wards in service delivery; If the committees of wards 29 and 32 were given more powers to play a much wider role in providing leadership and make decisions in their communities (being elevated from an advisory role to ward management structures), they would make an impact in enhancing basic service delivery; and, With additional decision-making powers ward committees could play a more effective role in local government matters. The perceived slow pace of service delivery by municipalities has resulted in growing impatience and dissatisfaction, in particular among poor communities. This has been demonstrated by the spontaneous protests and unrests directed at municipalities that have been taking place nationally since 2003. The uprisings explain two aspects, namely local government is considered by communities to be the delivery arm of government in South Africa and poor communities feel betrayed because their active participation in government-provided spaces for participation such as municipal elections, ward committees and IDPs did not yield the result of promised development (Theron, 2008:36). iv The study employed the qualitative research design using an interview survey as a method of data collection and the reviewing of existing study material and documents to test the validity of the afore-mentioned assumptions. Lastly, with the aim of assisting BCM in nurturing the potential of ward committees operating in its area of jurisdiction, the following recommendations based on the findings of the study are made: BCM considers subjecting ward committees to structured formal and accredited training; BCM delivers services in a legally compliant manner; BCM delegates sufficient powers to ward committees; Ward committees be trained together with officials that drive the CBP process when BCM starts implementing the process; and, BCM provides support to ward committees.
- Full Text:
- Date Issued: 2010
- Authors: Jakatyana, Xolile Christopher
- Date: 2010
- Subjects: Buffalo City (South Africa) , Local government -- South Africa -- Buffalo City -- Citizen participation , Municipal government -- South Africa -- Buffalo City -- Citizen participation , Municipal services -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MPA
- Identifier: vital:8201 , http://hdl.handle.net/10948/1256 , Buffalo City (South Africa) , Local government -- South Africa -- Buffalo City -- Citizen participation , Municipal government -- South Africa -- Buffalo City -- Citizen participation , Municipal services -- South Africa -- Eastern Cape
- Description: This study investigated the role of selected ward committees 29 and 32 of Nompumelelo and Tsholomnqa respectively in the Buffalo City Municipality (BCM) in enhancing basic service delivery. In terms of the White Paper on Local Government (1998:4), developmental local government promotes a system that centres on working with local communities to find sustainable ways to meet their needs and improve the quality of their lives. The study on that basis examines the nature and extent to which wards 29 and 32 committees enhanced basic service delivery within BCM. The study is premised on the assumptions that: The involvement of party-elected Councillors in ward committees inhibits members of ward committees from playing an active role in their communities; Ward committees are not clearly communicating municipality programmes to their communities; BCM is biased in favour of urban wards in service delivery; If the committees of wards 29 and 32 were given more powers to play a much wider role in providing leadership and make decisions in their communities (being elevated from an advisory role to ward management structures), they would make an impact in enhancing basic service delivery; and, With additional decision-making powers ward committees could play a more effective role in local government matters. The perceived slow pace of service delivery by municipalities has resulted in growing impatience and dissatisfaction, in particular among poor communities. This has been demonstrated by the spontaneous protests and unrests directed at municipalities that have been taking place nationally since 2003. The uprisings explain two aspects, namely local government is considered by communities to be the delivery arm of government in South Africa and poor communities feel betrayed because their active participation in government-provided spaces for participation such as municipal elections, ward committees and IDPs did not yield the result of promised development (Theron, 2008:36). iv The study employed the qualitative research design using an interview survey as a method of data collection and the reviewing of existing study material and documents to test the validity of the afore-mentioned assumptions. Lastly, with the aim of assisting BCM in nurturing the potential of ward committees operating in its area of jurisdiction, the following recommendations based on the findings of the study are made: BCM considers subjecting ward committees to structured formal and accredited training; BCM delivers services in a legally compliant manner; BCM delegates sufficient powers to ward committees; Ward committees be trained together with officials that drive the CBP process when BCM starts implementing the process; and, BCM provides support to ward committees.
- Full Text:
- Date Issued: 2010
An investigation into what influences action competence-oriented teaching and learning processes in a school environmental club
- Authors: James, Alison
- Date: 2010
- Subjects: Environmental education -- South Africa -- East London Environmental education -- Activity programs -- South Africa -- East London Environmental literacy -- South Africa -- East London Environmental literacy -- Study and teaching -- South Africa -- East London Active learning -- South Africa -- East London Competency-based education -- South Africa -- East London Teacher-student relationships -- South Africa -- East London
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1619 , http://hdl.handle.net/10962/d1003501
- Description: This interpretive case study sought to determine what influenced action competence-oriented teaching and learning processes in a high school environmental club. The goals were to describe a year of activities, within the TALON environmental club at Hudson Park High School in East London, South Africa and to identify how pedagogical, contextual and relational factors influenced action competence processes amongst club members. I explored how action competence theory and praxis have helped in other school education settings with the aim of establishing better environmental practices. The IVAC model of pedagogy (Jensen & Schnack, 1997) was used as a framework to operationalise action competence processes within the TALON Club. This entailed carefully examining investigative, visioning, action and change processes unfolding through the four themes of the club: plants, animal welfare, waste issues and our community outreach programme at Bongulethu High School. Using questionnaires, interviews, observation and a journal as the main methods of data collection I was able to make five analytical statements that related to the influence of pedagogy, the influence of context and the influence of relational dynamics within the TALON Club. The pedagogical processes were affected by the TALON members wanting to avoid any activities that were ‘too much like school’. However this served to compromise the action and visioning phases within the club, resulting in superficial and poorly-informed action-taking. The influence of context served to both enable and constrain action competence processes. The club and school structures therefore shaped the form that fledgling actions took as the TALON members participated in the meetings and outings and fulfilling the traditional expectations of the school community. Relational dynamics and a desire for fun took precedence over the action competence processes. Although the Club members were motivated by a sense of moral responsibility they were unable to articulate this concept into the club activities. In addition there were the power gradients between the educators and members to consider as determinants of the extent of participatory, democratic interactions. This complex interplay of factors influenced the action competence processes in the club. Recommendations were made on how best to work with the concepts of participation and democracy towards improving the reflexivity and knowledge base of both the educators and learners. In this way action competence processes will be better supported within the club in future.
- Full Text:
- Date Issued: 2010
- Authors: James, Alison
- Date: 2010
- Subjects: Environmental education -- South Africa -- East London Environmental education -- Activity programs -- South Africa -- East London Environmental literacy -- South Africa -- East London Environmental literacy -- Study and teaching -- South Africa -- East London Active learning -- South Africa -- East London Competency-based education -- South Africa -- East London Teacher-student relationships -- South Africa -- East London
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1619 , http://hdl.handle.net/10962/d1003501
- Description: This interpretive case study sought to determine what influenced action competence-oriented teaching and learning processes in a high school environmental club. The goals were to describe a year of activities, within the TALON environmental club at Hudson Park High School in East London, South Africa and to identify how pedagogical, contextual and relational factors influenced action competence processes amongst club members. I explored how action competence theory and praxis have helped in other school education settings with the aim of establishing better environmental practices. The IVAC model of pedagogy (Jensen & Schnack, 1997) was used as a framework to operationalise action competence processes within the TALON Club. This entailed carefully examining investigative, visioning, action and change processes unfolding through the four themes of the club: plants, animal welfare, waste issues and our community outreach programme at Bongulethu High School. Using questionnaires, interviews, observation and a journal as the main methods of data collection I was able to make five analytical statements that related to the influence of pedagogy, the influence of context and the influence of relational dynamics within the TALON Club. The pedagogical processes were affected by the TALON members wanting to avoid any activities that were ‘too much like school’. However this served to compromise the action and visioning phases within the club, resulting in superficial and poorly-informed action-taking. The influence of context served to both enable and constrain action competence processes. The club and school structures therefore shaped the form that fledgling actions took as the TALON members participated in the meetings and outings and fulfilling the traditional expectations of the school community. Relational dynamics and a desire for fun took precedence over the action competence processes. Although the Club members were motivated by a sense of moral responsibility they were unable to articulate this concept into the club activities. In addition there were the power gradients between the educators and members to consider as determinants of the extent of participatory, democratic interactions. This complex interplay of factors influenced the action competence processes in the club. Recommendations were made on how best to work with the concepts of participation and democracy towards improving the reflexivity and knowledge base of both the educators and learners. In this way action competence processes will be better supported within the club in future.
- Full Text:
- Date Issued: 2010
Generation of polyclonal antibodies against Theiler's Murine Encephalomyelitis virus protein 2C, and their use in investigating localisation of the protein in infected cells
- Authors: Jauka, Tembisa Innocencia
- Date: 2010
- Subjects: Picornaviruses , RNA viruses , Immunoglobulins , Encephalomyelitis
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:3959 , http://hdl.handle.net/10962/d1004018 , Picornaviruses , RNA viruses , Immunoglobulins , Encephalomyelitis
- Description: The Picornavirus family of positive sense RNA viruses includes some significant human and animal pathogens including Poliovirus (PV), Foot-and-Mouth disease virus (FMDV) and Human Rhinovirus (HRV). The genome is translated within the host cell into a polyprotein that is proteolytically cleaved into the structural and nonstructural proteins. The highly conserved, non-structural protein 2C has numerous roles during the virus life cycle and is essential for virus replication. Although the protein has been well studied in the case of PV, its interactions with the host cell during picornavirus infection is poorly understood. Theiler’s Encephalomyelitis virus (TMEV) is a picornavirus that infects mice, and is being used in our laboratory as a model in which to study the 2C protein. In this study, polyclonal antibodies against the TMEV 2C protein were generated and used to localise the protein in infected cells by indirect immunofluorescence. To produce antigen for immunisation purposes, the TMEV-2C protein sequence was analysed to identify hydrophilic and antigenic regions. An internal region of the 2C representing amino acid residues 31-210 was selected, expressed in bacteria and purified by nickel NTA affinity chromatography. Time course analysis of 2C (31-210) showed that the peptide was maximally expressed at 5 hours post induction. The peptide was solubilised using a mild detergent and 1.5 mg of purified antigen was used for immunisation of rabbits. Western blot analysis confirmed that the antibodies could detect both bacteriallyexpressed antigen, and virally-expressed 2C. Examination of virus-infected baby hamster kidney cells by immunofluorescence and confocal microscopy using the antiserum (anti-TMEV 2C antibodies) showed that the protein had a diffuse distribution upon early infection and at later stages it was located in a large perinuclear structure representing the viral replication complex. Furthermore, 2C localised to the Golgi apparatus as revealed by dual-label immunofluorescence using anti-TMEV 2C antibodies and wheat germ agglutinin (WGA). Furthermore, it was shown that TMEV infection results in changes in cell morphology and a redistribution of the cytoskeletal protein, β-actin. The successful production of antibodies that recognise TMEV 2C opens the way for further studies to investigate interactions between 2C and hostencoded factors.
- Full Text:
- Date Issued: 2010
- Authors: Jauka, Tembisa Innocencia
- Date: 2010
- Subjects: Picornaviruses , RNA viruses , Immunoglobulins , Encephalomyelitis
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:3959 , http://hdl.handle.net/10962/d1004018 , Picornaviruses , RNA viruses , Immunoglobulins , Encephalomyelitis
- Description: The Picornavirus family of positive sense RNA viruses includes some significant human and animal pathogens including Poliovirus (PV), Foot-and-Mouth disease virus (FMDV) and Human Rhinovirus (HRV). The genome is translated within the host cell into a polyprotein that is proteolytically cleaved into the structural and nonstructural proteins. The highly conserved, non-structural protein 2C has numerous roles during the virus life cycle and is essential for virus replication. Although the protein has been well studied in the case of PV, its interactions with the host cell during picornavirus infection is poorly understood. Theiler’s Encephalomyelitis virus (TMEV) is a picornavirus that infects mice, and is being used in our laboratory as a model in which to study the 2C protein. In this study, polyclonal antibodies against the TMEV 2C protein were generated and used to localise the protein in infected cells by indirect immunofluorescence. To produce antigen for immunisation purposes, the TMEV-2C protein sequence was analysed to identify hydrophilic and antigenic regions. An internal region of the 2C representing amino acid residues 31-210 was selected, expressed in bacteria and purified by nickel NTA affinity chromatography. Time course analysis of 2C (31-210) showed that the peptide was maximally expressed at 5 hours post induction. The peptide was solubilised using a mild detergent and 1.5 mg of purified antigen was used for immunisation of rabbits. Western blot analysis confirmed that the antibodies could detect both bacteriallyexpressed antigen, and virally-expressed 2C. Examination of virus-infected baby hamster kidney cells by immunofluorescence and confocal microscopy using the antiserum (anti-TMEV 2C antibodies) showed that the protein had a diffuse distribution upon early infection and at later stages it was located in a large perinuclear structure representing the viral replication complex. Furthermore, 2C localised to the Golgi apparatus as revealed by dual-label immunofluorescence using anti-TMEV 2C antibodies and wheat germ agglutinin (WGA). Furthermore, it was shown that TMEV infection results in changes in cell morphology and a redistribution of the cytoskeletal protein, β-actin. The successful production of antibodies that recognise TMEV 2C opens the way for further studies to investigate interactions between 2C and hostencoded factors.
- Full Text:
- Date Issued: 2010
Stock farmers and the state: a case study of animal healthcare practices in Hertzog Eastern Cape Province South Africa
- Authors: Jenjezwa, Vimbai Rachel
- Date: 2010
- Subjects: Agriculture and state -- South Africa -- Eastern Cape , Traditional veterinary medicine -- South Africa -- Eastern Cape , Animal health , Domestic animals -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MSc (Geography)
- Identifier: vital:11508 , http://hdl.handle.net/10353/269 , Agriculture and state -- South Africa -- Eastern Cape , Traditional veterinary medicine -- South Africa -- Eastern Cape , Animal health , Domestic animals -- South Africa -- Eastern Cape
- Description: The animal healthcare practices of most communal farmers involve the use of both conventional and ethnoveterinary medicines. This study presents information on the animal healthcare practices of stock farmers in Hertzog, Eastern Cape Province, South Africa. It also presents the findings on the social, economic and political aspects surrounding animal healthcare. The research applied two theories namely structuration theory and the Context, Practice and Belief (CPB) framework. Interviews and participant observation were used to collect data. The communal farmers widely used conventional medicines however, proper administration methods were not followed. Ethnoveterinary medicines were used to prevent and treat disease, even by the younger stock farmers. The stock farmers used ethnoveterinary medicines mainly because of the lack of finance to purchase the conventional medicines, even though the latter was preferred. The stock farmers actively participated in state programmes but felt that they needed more state veterinarian visits and state provided medications because they could not afford private veterinarians and conventional medicines. Therefore, this study attempts to contribute to an understanding of the use of ethnoveterinary medicine and communal farmers’ animal healthcare practices.
- Full Text:
- Date Issued: 2010
- Authors: Jenjezwa, Vimbai Rachel
- Date: 2010
- Subjects: Agriculture and state -- South Africa -- Eastern Cape , Traditional veterinary medicine -- South Africa -- Eastern Cape , Animal health , Domestic animals -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MSc (Geography)
- Identifier: vital:11508 , http://hdl.handle.net/10353/269 , Agriculture and state -- South Africa -- Eastern Cape , Traditional veterinary medicine -- South Africa -- Eastern Cape , Animal health , Domestic animals -- South Africa -- Eastern Cape
- Description: The animal healthcare practices of most communal farmers involve the use of both conventional and ethnoveterinary medicines. This study presents information on the animal healthcare practices of stock farmers in Hertzog, Eastern Cape Province, South Africa. It also presents the findings on the social, economic and political aspects surrounding animal healthcare. The research applied two theories namely structuration theory and the Context, Practice and Belief (CPB) framework. Interviews and participant observation were used to collect data. The communal farmers widely used conventional medicines however, proper administration methods were not followed. Ethnoveterinary medicines were used to prevent and treat disease, even by the younger stock farmers. The stock farmers used ethnoveterinary medicines mainly because of the lack of finance to purchase the conventional medicines, even though the latter was preferred. The stock farmers actively participated in state programmes but felt that they needed more state veterinarian visits and state provided medications because they could not afford private veterinarians and conventional medicines. Therefore, this study attempts to contribute to an understanding of the use of ethnoveterinary medicine and communal farmers’ animal healthcare practices.
- Full Text:
- Date Issued: 2010
An investigation of principals' perceptions and experiences of the implementation of the national standards and performance indicators (NSPI) for Namibian schools in the Ohangwena region
- Authors: Johannes, Thomas Kamusheefa
- Date: 2010
- Subjects: Professional education -- Namibia Educational change -- Namibia Education -- Namibia Education and state -- Namibia School management and organization -- Namibia
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1640 , http://hdl.handle.net/10962/d1003522
- Description: The post independence Namibian education system has been characterised by many reform initiatives, aimed at eradicating inequity, poor performance, and inferior education provision inherited from a pre-independence education system. This legacy posed a serious challenge to Namibia when it set out to achieve a national goal, Vision 2030. Vision 2030 inspires Namibia to be among the eveloped countries in 2030. In an attempt to achieve the goals outlined by the mission statement of Vision 2030, the Ministry of Education (MoE) introduced two national education initiatives: the Education and Training Sector Improvement Program (ETSIP), and the National Standards and Performance Indicators (NSPIs). These would be implemented in Namibian schools as, respectively, the Ministry’s strategic plan and its policy document. The NSPIs were introduced to address the fragmentation of standards and inequity in regions and schools in Namibia, as they aimed to standardise the provision of equal, quality education across the country (Namibia. MoE, 2005a, p. 1). The NSPI policy calls for schools to take quality assurance seriously, with particular emphasis on School Self-Evaluation (SSE), a process that encourages self-management (Namibia. MoE, 2007a, p. 3). Thus, the standards set out by the NSPIs became the yardstick by which internal and external school evaluators could assess whole school performance. The purpose of this present study was to investigate the perceptions and experiences of principals in the Ohangwena Region following the implementation of the NSPIs. It is a case study involving two Inspectors of Education (IoEs), twelve principals, and four Heads of Department (HODs). Interviews, document analysis, questionnaires, and a focus group interview were used to collect the data. The study found that principals acknowledge the importance of the NSPIs, and believe that they would succeed in improving the provision of quality education if they were fully implemented. The study found that schools implemented Performance Indicators 5.3 (School Administration) Aspect 5.3.2 (Storage and retrieval of information) in Key Area 5. However, the results of the study also showed that principals experienced many challenges in the implementation of the NSPIs. These included a lack of understanding among principals and teachers of the NSPIs, a lack of understanding of contemporary leadership theories (that would otherwise help principals to implement change effectively), and a lack of support in terms of skills and resources from both the Regional Office in Ohangwena and the MoE itself. The study found that the NSPIs have not yet improved school performance, and consequently that the pass rate remains the same as before the introduction of the NSPIs, four years ago. The SSE, which aims to help schools identify their strengths and weaknesses, and encourages them to establish and make use of a School Development Plan (SDP) to address weaknesses and sustain strengths, is characterised by a high degree of dishonesty. Thus, the information furnished by SSEs, SDPs, and Teachers Self-Evaluations (TSEs) is unreliable, lacks credibility, and has the further ill-effect of skewing schools’ performance targets. Therefore, this problem could be addressed when the rationale of completing the SSE is clearly explained to principals and teachers.
- Full Text:
- Date Issued: 2010
- Authors: Johannes, Thomas Kamusheefa
- Date: 2010
- Subjects: Professional education -- Namibia Educational change -- Namibia Education -- Namibia Education and state -- Namibia School management and organization -- Namibia
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1640 , http://hdl.handle.net/10962/d1003522
- Description: The post independence Namibian education system has been characterised by many reform initiatives, aimed at eradicating inequity, poor performance, and inferior education provision inherited from a pre-independence education system. This legacy posed a serious challenge to Namibia when it set out to achieve a national goal, Vision 2030. Vision 2030 inspires Namibia to be among the eveloped countries in 2030. In an attempt to achieve the goals outlined by the mission statement of Vision 2030, the Ministry of Education (MoE) introduced two national education initiatives: the Education and Training Sector Improvement Program (ETSIP), and the National Standards and Performance Indicators (NSPIs). These would be implemented in Namibian schools as, respectively, the Ministry’s strategic plan and its policy document. The NSPIs were introduced to address the fragmentation of standards and inequity in regions and schools in Namibia, as they aimed to standardise the provision of equal, quality education across the country (Namibia. MoE, 2005a, p. 1). The NSPI policy calls for schools to take quality assurance seriously, with particular emphasis on School Self-Evaluation (SSE), a process that encourages self-management (Namibia. MoE, 2007a, p. 3). Thus, the standards set out by the NSPIs became the yardstick by which internal and external school evaluators could assess whole school performance. The purpose of this present study was to investigate the perceptions and experiences of principals in the Ohangwena Region following the implementation of the NSPIs. It is a case study involving two Inspectors of Education (IoEs), twelve principals, and four Heads of Department (HODs). Interviews, document analysis, questionnaires, and a focus group interview were used to collect the data. The study found that principals acknowledge the importance of the NSPIs, and believe that they would succeed in improving the provision of quality education if they were fully implemented. The study found that schools implemented Performance Indicators 5.3 (School Administration) Aspect 5.3.2 (Storage and retrieval of information) in Key Area 5. However, the results of the study also showed that principals experienced many challenges in the implementation of the NSPIs. These included a lack of understanding among principals and teachers of the NSPIs, a lack of understanding of contemporary leadership theories (that would otherwise help principals to implement change effectively), and a lack of support in terms of skills and resources from both the Regional Office in Ohangwena and the MoE itself. The study found that the NSPIs have not yet improved school performance, and consequently that the pass rate remains the same as before the introduction of the NSPIs, four years ago. The SSE, which aims to help schools identify their strengths and weaknesses, and encourages them to establish and make use of a School Development Plan (SDP) to address weaknesses and sustain strengths, is characterised by a high degree of dishonesty. Thus, the information furnished by SSEs, SDPs, and Teachers Self-Evaluations (TSEs) is unreliable, lacks credibility, and has the further ill-effect of skewing schools’ performance targets. Therefore, this problem could be addressed when the rationale of completing the SSE is clearly explained to principals and teachers.
- Full Text:
- Date Issued: 2010
Time course of performance changes and fatigue markers during training for the ironman triathlon
- Authors: Joiner, Alexander Jason
- Date: 2010
- Subjects: Ironman triathlons -- Training , Physical education and training -- Physiological aspects , Endurance sports -- Training , Sports -- Physiological aspects , Fatigue
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5133 , http://hdl.handle.net/10962/d1005212 , Ironman triathlons -- Training , Physical education and training -- Physiological aspects , Endurance sports -- Training , Sports -- Physiological aspects , Fatigue
- Description:
Suboptimal preparation for the Ironman triathlon can have detrimental effects on mental and physical condition. The purpose of this longitudinal investigation was to examine the relationship between a number of performance changes and fatigue markers during training for an Ironman as well as immediately after the event, in an attempt to better understand the effects of ultraendurance training. Eighteen athletes training for the Ironman; South Africa, 2009 were recruited for the study. Over the 6 month data collection period body mass, training load (TRIMP and Session x RPE methods), physiological responses (waking heart rate, postural dizziness, sleep ratings), changes in psychological state (profile of mood states - POMS), reported immunological responses (symptoms of illness), biochemical changes (salivary cortisol and alpha amylase) and performance (8 km submaximal running time trial (TT) and race day performance) were measured. These responses were compared to a control sample (n=15). Results show a significant increase (p<0.05) in training load (3899.4 ± 2517.8) four weeks prior to the event. Fatigue scores significantly increased (p<0.05) concurrently with this significant increase (p<0.05) in training. TT performance did not significantly (p<0.05) alter during the time course of training. It was however strongly correlated to training load (R2=0.85) and modestly related to race performance (R2=0.65). The signs and symptoms of upper respiratory tract infections (URTI) were prevalent during the training period, decreasing during the taper and race period. Large standard deviations were found within the majority of the responses. During the final two weeks of preparation, tension scores were significantly increased (p<0.05) while training load significantly decreased (p<0.05) during the final week of preparation. Cortisol increased significantly (p<0.05) immediately post race (0.507±0.15
- Full Text:
- Date Issued: 2010
- Authors: Joiner, Alexander Jason
- Date: 2010
- Subjects: Ironman triathlons -- Training , Physical education and training -- Physiological aspects , Endurance sports -- Training , Sports -- Physiological aspects , Fatigue
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5133 , http://hdl.handle.net/10962/d1005212 , Ironman triathlons -- Training , Physical education and training -- Physiological aspects , Endurance sports -- Training , Sports -- Physiological aspects , Fatigue
- Description:
Suboptimal preparation for the Ironman triathlon can have detrimental effects on mental and physical condition. The purpose of this longitudinal investigation was to examine the relationship between a number of performance changes and fatigue markers during training for an Ironman as well as immediately after the event, in an attempt to better understand the effects of ultraendurance training. Eighteen athletes training for the Ironman; South Africa, 2009 were recruited for the study. Over the 6 month data collection period body mass, training load (TRIMP and Session x RPE methods), physiological responses (waking heart rate, postural dizziness, sleep ratings), changes in psychological state (profile of mood states - POMS), reported immunological responses (symptoms of illness), biochemical changes (salivary cortisol and alpha amylase) and performance (8 km submaximal running time trial (TT) and race day performance) were measured. These responses were compared to a control sample (n=15). Results show a significant increase (p<0.05) in training load (3899.4 ± 2517.8) four weeks prior to the event. Fatigue scores significantly increased (p<0.05) concurrently with this significant increase (p<0.05) in training. TT performance did not significantly (p<0.05) alter during the time course of training. It was however strongly correlated to training load (R2=0.85) and modestly related to race performance (R2=0.65). The signs and symptoms of upper respiratory tract infections (URTI) were prevalent during the training period, decreasing during the taper and race period. Large standard deviations were found within the majority of the responses. During the final two weeks of preparation, tension scores were significantly increased (p<0.05) while training load significantly decreased (p<0.05) during the final week of preparation. Cortisol increased significantly (p<0.05) immediately post race (0.507±0.15
- Full Text:
- Date Issued: 2010
A critical analysis of discourses constructing portfolio assessment practices in three Eastern Cape schools
- Authors: Jones, Barbara Ellen
- Date: 2010
- Subjects: Discourse analysis -- South Africa -- Eastern Cape -- Case studies Competency-based education -- South Africa -- Eastern Cape -- Case studies Educational tests and measurements -- South Africa -- Eastern Cape -- Case studies Education -- Evaluation -- South Africa -- Eastern Cape -- Case studies Curriculum evaluation -- South Africa -- Eastern Cape -- Case studies
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:1468 , http://hdl.handle.net/10962/d1003349
- Description: In 1998, South Africa introduced outcomes-based education to affect the shifts in pedagogy considered necessary following the move to democracy in 1994. Across the globe, the use of the portfolio to assess learners is increasingly being promoted as a form of progressive pedagogy. Hence, its adoption by the country as a new form of assessment practice was warranted. However, how the portfolio is constructed and perceived by educators within the classroom can become problematic in practice. This was apparent in the South African context and justifies research into how the portfolio is constructed as an assessment method in educational policy and by educators in the classrooms. The Curriculum Guide Directive text and the transcripts of twenty-one interviews carried out in three Eastern Cape schools served as the source of data for this study. Discourses make up a powerful framework of spoken, written and symbolic texts of institutional bureaucracies. Within these institutions human subjects are defined and constructed. Therefore, discourse construction acts as institutional forms of knowledge which can exude power over the individual if not made transparent. I used critical discourse analysis to uncover the discourses that were embedded within the Curriculum Guide Directive and to identify the discourses entrenched within the educators’ perceptions of the portfolio. The discourses in the Curriculum Guide Directive suggest the construction of the portfolio as a method of surveillance to track whether the educators are preparing learners for the school leaving examination and instructing the educators to provide evidence in the form of a portfolio. Analysis of the transcripts of the twenty one interviews with educators from three schools in the Eastern Cape indicated that the portfolio was not seen as a form of assessment by the educators, but as a form of discipline put in place by the Department of Education to ensure that they are preparing the learners for the school leaving examination and are able to produce proof of this preparation in the form of a portfolio. The discourses from the research highlighted that the school leaving examination is hegemonised into South African educational pedagogy as a form of traditional assessment and is not challenged even when it is no longer bringing about the dominant ideological goals. The portfolio was not seen as an assessment method by the educators nor represented as such in the Curriculum Guide Directive. Therefore, the job of the portfolio became that of a policing tool. Thus, a school curriculum which has been introduced with the intent of furthering social justice can become exclusive in practice, even with the best intentions.
- Full Text:
- Date Issued: 2010
- Authors: Jones, Barbara Ellen
- Date: 2010
- Subjects: Discourse analysis -- South Africa -- Eastern Cape -- Case studies Competency-based education -- South Africa -- Eastern Cape -- Case studies Educational tests and measurements -- South Africa -- Eastern Cape -- Case studies Education -- Evaluation -- South Africa -- Eastern Cape -- Case studies Curriculum evaluation -- South Africa -- Eastern Cape -- Case studies
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:1468 , http://hdl.handle.net/10962/d1003349
- Description: In 1998, South Africa introduced outcomes-based education to affect the shifts in pedagogy considered necessary following the move to democracy in 1994. Across the globe, the use of the portfolio to assess learners is increasingly being promoted as a form of progressive pedagogy. Hence, its adoption by the country as a new form of assessment practice was warranted. However, how the portfolio is constructed and perceived by educators within the classroom can become problematic in practice. This was apparent in the South African context and justifies research into how the portfolio is constructed as an assessment method in educational policy and by educators in the classrooms. The Curriculum Guide Directive text and the transcripts of twenty-one interviews carried out in three Eastern Cape schools served as the source of data for this study. Discourses make up a powerful framework of spoken, written and symbolic texts of institutional bureaucracies. Within these institutions human subjects are defined and constructed. Therefore, discourse construction acts as institutional forms of knowledge which can exude power over the individual if not made transparent. I used critical discourse analysis to uncover the discourses that were embedded within the Curriculum Guide Directive and to identify the discourses entrenched within the educators’ perceptions of the portfolio. The discourses in the Curriculum Guide Directive suggest the construction of the portfolio as a method of surveillance to track whether the educators are preparing learners for the school leaving examination and instructing the educators to provide evidence in the form of a portfolio. Analysis of the transcripts of the twenty one interviews with educators from three schools in the Eastern Cape indicated that the portfolio was not seen as a form of assessment by the educators, but as a form of discipline put in place by the Department of Education to ensure that they are preparing the learners for the school leaving examination and are able to produce proof of this preparation in the form of a portfolio. The discourses from the research highlighted that the school leaving examination is hegemonised into South African educational pedagogy as a form of traditional assessment and is not challenged even when it is no longer bringing about the dominant ideological goals. The portfolio was not seen as an assessment method by the educators nor represented as such in the Curriculum Guide Directive. Therefore, the job of the portfolio became that of a policing tool. Thus, a school curriculum which has been introduced with the intent of furthering social justice can become exclusive in practice, even with the best intentions.
- Full Text:
- Date Issued: 2010
Isolation of xylanolytic multi-enzyme complexes from Bacillus subtilis SJ01
- Authors: Jones, Sarah Melissa Jane
- Date: 2010
- Subjects: Bacillus subtilis , Xylans , Multienzyme complexes , Botanical chemistry , Cellulose , Hemicellulose , Polysaccharides
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:3974 , http://hdl.handle.net/10962/d1004033 , Bacillus subtilis , Xylans , Multienzyme complexes , Botanical chemistry , Cellulose , Hemicellulose , Polysaccharides
- Description: Cellulose and hemicellulose account for a large portion of the world‘s plant biomass. In nature, these polysaccharides are intertwined forming complex materials that require multiple enzymes to degrade them. Multi-enzyme complexes (MECs) consist of a number of enzymes working in close proximity and synergistically to degrade complex substrates with higher efficiency than individual enzymes. The cellulosome is a cellulolytic MEC produced by anaerobic bacteria that has been studied extensively since its discovery in 1983. The aim of this study was to purify a cellulolytic and/or hemicellulolytic MEC from an aerobic bacterium of the Bacillus genus. Several bacterial isolates were identified using morphological characteristics and 16S rDNA sequencing, and screened for their ability to degrade cellulose and xylan using a MEC. The isolate that produced a high molecular weight protein fraction with the greatest ability to degrade Avicel®, carboxymethyl cellulose (CMC) and birchwood xylan was identified as Bacillus subtilis SJ01. An optimised growth medium, consisting of vitamins, trace elements, birchwood xylan (as the carbon source), and yeast and ammonium sulphate (as the nitrogen sources), increased the production of CMCase and xylanase enzymes from this bacterium. The removal of a competing bacterial strain from the culture and the inhibition of proteases also increased enzyme activities. A growth curve of B. subtilis SJ01 indicated that xylanase production was highest in early stationary growth phase and thus 84 hours was chosen as the best cell harvesting time. To purify the MECs produced by B. subtilis SJ01 size-exclusion chromatography on a Sephacryl S-400 column was used. It was concluded that (for the purposes of this study) the best method of concentrating the culture supernatant prior to loading onto Sephacryl S-400 was the use of ultrafiltration with a 50 kDa cut-off membrane. Two MECs, named C1 and C2 of 371 and 267 kDa, respectively, were purified from the culture supernatant of B. subtilis SJ01. Electrophoretic analysis revealed that these MECs consisted of 16 and 18 subunits, respectively, 4 of which degraded birchwood xylan and 5 of which degraded oat spelt xylan. The MECs degraded xylan substrates (C1: 0.24 U/mg, C2: 0.14 U/mg birchwood xylan) with higher efficiency than cellulose substrates (C1: 0.002 U/mg, C2: 0.01 U/mg CMC), and could therefore be considered xylanosomes. Interestingly, the MECs did not bind to insoluble birchwood xylan or Avicel® and did not contain glycosylated proteins, which are common features of cellulosomes. This study is, therefore, important in revealing the presence of MECs that differ from the cellulosome and that may have particular application in industries requiring high xylanase activity, such as the paper and pulp industry. The abundant genetic information available on B. subtilis means that this organism could also be used for genetic engineering of cellulolytic/hemicellulolytic MECs.
- Full Text:
- Date Issued: 2010
- Authors: Jones, Sarah Melissa Jane
- Date: 2010
- Subjects: Bacillus subtilis , Xylans , Multienzyme complexes , Botanical chemistry , Cellulose , Hemicellulose , Polysaccharides
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:3974 , http://hdl.handle.net/10962/d1004033 , Bacillus subtilis , Xylans , Multienzyme complexes , Botanical chemistry , Cellulose , Hemicellulose , Polysaccharides
- Description: Cellulose and hemicellulose account for a large portion of the world‘s plant biomass. In nature, these polysaccharides are intertwined forming complex materials that require multiple enzymes to degrade them. Multi-enzyme complexes (MECs) consist of a number of enzymes working in close proximity and synergistically to degrade complex substrates with higher efficiency than individual enzymes. The cellulosome is a cellulolytic MEC produced by anaerobic bacteria that has been studied extensively since its discovery in 1983. The aim of this study was to purify a cellulolytic and/or hemicellulolytic MEC from an aerobic bacterium of the Bacillus genus. Several bacterial isolates were identified using morphological characteristics and 16S rDNA sequencing, and screened for their ability to degrade cellulose and xylan using a MEC. The isolate that produced a high molecular weight protein fraction with the greatest ability to degrade Avicel®, carboxymethyl cellulose (CMC) and birchwood xylan was identified as Bacillus subtilis SJ01. An optimised growth medium, consisting of vitamins, trace elements, birchwood xylan (as the carbon source), and yeast and ammonium sulphate (as the nitrogen sources), increased the production of CMCase and xylanase enzymes from this bacterium. The removal of a competing bacterial strain from the culture and the inhibition of proteases also increased enzyme activities. A growth curve of B. subtilis SJ01 indicated that xylanase production was highest in early stationary growth phase and thus 84 hours was chosen as the best cell harvesting time. To purify the MECs produced by B. subtilis SJ01 size-exclusion chromatography on a Sephacryl S-400 column was used. It was concluded that (for the purposes of this study) the best method of concentrating the culture supernatant prior to loading onto Sephacryl S-400 was the use of ultrafiltration with a 50 kDa cut-off membrane. Two MECs, named C1 and C2 of 371 and 267 kDa, respectively, were purified from the culture supernatant of B. subtilis SJ01. Electrophoretic analysis revealed that these MECs consisted of 16 and 18 subunits, respectively, 4 of which degraded birchwood xylan and 5 of which degraded oat spelt xylan. The MECs degraded xylan substrates (C1: 0.24 U/mg, C2: 0.14 U/mg birchwood xylan) with higher efficiency than cellulose substrates (C1: 0.002 U/mg, C2: 0.01 U/mg CMC), and could therefore be considered xylanosomes. Interestingly, the MECs did not bind to insoluble birchwood xylan or Avicel® and did not contain glycosylated proteins, which are common features of cellulosomes. This study is, therefore, important in revealing the presence of MECs that differ from the cellulosome and that may have particular application in industries requiring high xylanase activity, such as the paper and pulp industry. The abundant genetic information available on B. subtilis means that this organism could also be used for genetic engineering of cellulolytic/hemicellulolytic MECs.
- Full Text:
- Date Issued: 2010
Improving explanation writing skills of junior secondary learners in life sciences: a case study
- Authors: Josua, Helena Megameno N
- Date: 2010
- Subjects: Writing skills English language -- Study and teaching (Secondary) -- South Africa English language -- Writing -- Study and teaching
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1570 , http://hdl.handle.net/10962/d1003452
- Description: Learners in the Junior Secondary Phase (Grades 8 to 10) are often required to answer open-ended questions which require a response in the form of an explanation. As frequently reported in the external examiners' reports of Life Sciences, learners do not write adequate explanations as responses to explanatory questions. This thesis reports on action research based on my experience as a Life Sciences teacher trying to address this problem. Therefore, the purpose of this study was to develop suitable, manageable and effective strategies that I could implement in order to improve my teaching of explanation writing skills of in the Junior Secondary school learners with a view to enhance curriculum content knowledge in Life Sciences. The intervention was carried out in a Grade 10 Life Sciences class which consisted of 35 learners. The first cycle consisted of seven lessons carried out over two weeks in normal school time. The main sources of data from my lesson interventions were the learners' written work, their journal entries, the researcher's journal, the field notes from the non-participant observer and interviews with two focus groups. Both the interviews and the lessons were recorded and transcribed. The research data reveals that the ability of the Junior Secondary learners to write explanations was hindered by language problems. In addition, a lack of integration of language issues into the subject content was a contributing factor to their inadequate writing skills. Spelling errors and lack of expression in English second language contribute to the problem of writing good explanations. The data has also revealed that learners‟ writing skills can be improved by implementing suitable teaching strategies, such as the curriculum cycle as proposed by Gibbons (2002). The curriculum cycle can be modified to fit the learners' needs and the real teaching situation. The amount of practice required to master the skill of writing in the genre of explanations should be considered.
- Full Text:
- Date Issued: 2010
- Authors: Josua, Helena Megameno N
- Date: 2010
- Subjects: Writing skills English language -- Study and teaching (Secondary) -- South Africa English language -- Writing -- Study and teaching
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1570 , http://hdl.handle.net/10962/d1003452
- Description: Learners in the Junior Secondary Phase (Grades 8 to 10) are often required to answer open-ended questions which require a response in the form of an explanation. As frequently reported in the external examiners' reports of Life Sciences, learners do not write adequate explanations as responses to explanatory questions. This thesis reports on action research based on my experience as a Life Sciences teacher trying to address this problem. Therefore, the purpose of this study was to develop suitable, manageable and effective strategies that I could implement in order to improve my teaching of explanation writing skills of in the Junior Secondary school learners with a view to enhance curriculum content knowledge in Life Sciences. The intervention was carried out in a Grade 10 Life Sciences class which consisted of 35 learners. The first cycle consisted of seven lessons carried out over two weeks in normal school time. The main sources of data from my lesson interventions were the learners' written work, their journal entries, the researcher's journal, the field notes from the non-participant observer and interviews with two focus groups. Both the interviews and the lessons were recorded and transcribed. The research data reveals that the ability of the Junior Secondary learners to write explanations was hindered by language problems. In addition, a lack of integration of language issues into the subject content was a contributing factor to their inadequate writing skills. Spelling errors and lack of expression in English second language contribute to the problem of writing good explanations. The data has also revealed that learners‟ writing skills can be improved by implementing suitable teaching strategies, such as the curriculum cycle as proposed by Gibbons (2002). The curriculum cycle can be modified to fit the learners' needs and the real teaching situation. The amount of practice required to master the skill of writing in the genre of explanations should be considered.
- Full Text:
- Date Issued: 2010
Rural livelihoods and food security in the aftermath of the fast track land reform in Zimbabwe
- Authors: Jowah, Eddah Vimbai
- Date: 2010
- Subjects: Land reform -- Zimbabwe Food security -- Zimbabwe Sustainable development -- Zimbabwe Right of property -- Zimbabwe Zimbabwe -- Economic conditions Rural development -- Zimbabwe
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3302 , http://hdl.handle.net/10962/d1003090
- Description: Land reforms are back on the development agenda. Different types of land reforms have been adopted globally in recent years, but by far the most controversial and most radical has been the fast track land reform pursued by the Government of Zimbabwe from 2000. There is general scholarly agreement that the fast track process has been accompanied by various socio-economic and political challenges, including an increase in levels of food insecurity. This thesis examines fast track reform in specific relation to the livelihoods of smallholder households and household food security amongst land beneficiaries. It argues that the problem of food insecurity in Zimbabwe is a complex social, political and economic issue, which cannot be simplistically reduced to the failures of fast track. Understanding household food insecurity post-2000 needs to go beyond the notion that the nation‟s food security hinges on overall levels of production alone. In particular, livelihoods and food security need to be conceptualised at community and household levels. Therefore, while addressing the broad macro-level analysis and discourse around the process of fast track, the study also adopts a micro-level analysis to look at the varied impact of fast track on the actual beneficiaries. The research focuses on small-scale beneficiaries in the Goromonzi District of Zimbabwe and, through the use of the sustainable livelihoods framework, looks at how their local contexts have been influenced by the wider socio-economic and political processes, and how beneficiaries have sought ways of coping with the challenges they face.
- Full Text:
- Date Issued: 2010
- Authors: Jowah, Eddah Vimbai
- Date: 2010
- Subjects: Land reform -- Zimbabwe Food security -- Zimbabwe Sustainable development -- Zimbabwe Right of property -- Zimbabwe Zimbabwe -- Economic conditions Rural development -- Zimbabwe
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3302 , http://hdl.handle.net/10962/d1003090
- Description: Land reforms are back on the development agenda. Different types of land reforms have been adopted globally in recent years, but by far the most controversial and most radical has been the fast track land reform pursued by the Government of Zimbabwe from 2000. There is general scholarly agreement that the fast track process has been accompanied by various socio-economic and political challenges, including an increase in levels of food insecurity. This thesis examines fast track reform in specific relation to the livelihoods of smallholder households and household food security amongst land beneficiaries. It argues that the problem of food insecurity in Zimbabwe is a complex social, political and economic issue, which cannot be simplistically reduced to the failures of fast track. Understanding household food insecurity post-2000 needs to go beyond the notion that the nation‟s food security hinges on overall levels of production alone. In particular, livelihoods and food security need to be conceptualised at community and household levels. Therefore, while addressing the broad macro-level analysis and discourse around the process of fast track, the study also adopts a micro-level analysis to look at the varied impact of fast track on the actual beneficiaries. The research focuses on small-scale beneficiaries in the Goromonzi District of Zimbabwe and, through the use of the sustainable livelihoods framework, looks at how their local contexts have been influenced by the wider socio-economic and political processes, and how beneficiaries have sought ways of coping with the challenges they face.
- Full Text:
- Date Issued: 2010
Effect of exposure charts on reject rate of extremity radiographs
- Authors: Kalondo, Luzanne
- Date: 2010
- Subjects: Radiography, Medical -- Exposure , Radiography, Medical -- Image quality , Radiography, Medical -- South Africa , Diagnostic imaging -- South Africa
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: vital:10076 , http://hdl.handle.net/10948/1168 , Radiography, Medical -- Exposure , Radiography, Medical -- Image quality , Radiography, Medical -- South Africa , Diagnostic imaging -- South Africa
- Description: This study discusses reject film analyses (RFAs) before and after the implementation of a quality improvement intervention. RFAs were undertaken to investigate the effect of the introduction and use of exposure charts (ECs) on department and student reject rates of extremity radiographs. Methods: A quantitative comparative pre and post-treatment research design was used. Data was collected from the x-ray departments of two training hospitals in Windhoek, Namibia over a five month period. A retrospective RFA was conducted to determine the department and student reject rates for both departments before intervention. Emphasis was placed on exposure related reject films. ECs were compiled and introduced at Katutura State Hospital (venue B) by the researcher. The students were instructed to use these charts. At Windhoek Central Hospital (venue A) no ECs were used. A prospective RFA was conducted to establish department and student reject rates at both hospitals after the intervention at venue B. Results: During the retrospective phase the department reject rate for venue A was 21 percent while the student reject rate was 23 percent. At venue B 24 percent and 26 percent were scored respectively. Students at venue A produced rejected radiographs due to overexposure (49 percent) and underexposure (23 percent), whilst 37 percent was recorded for both causes at venue B. At venue A, 35 percent of films were rejected due to incorrect mAs selection, at venue B the figure was 42 percent. Undiagnostic radiographs due to inaccurate kV selection comprised 62 percent for venue A and 59 percent for venue B. During the prospective phase the department reject rate for venue A was 20 percent and that of the students was 19 percent. For venue B 12 percent and 11 percent were scored respectively. At venue A radiographs rejected due to over and underexposure were 43 percent and 33 percent respectively while those at venue B were 33 percent and 34 percent. Incorrect mAs selection caused 33 percent of discarded films at venue A and 38 percent at venue B. The figures for inaccurate kV selection were 68 percent and 62 percent for venues A and B. Conclusions: The introduction and use of ECs lowered the student reject rate at venue B in the prospective phase.
- Full Text:
- Date Issued: 2010
- Authors: Kalondo, Luzanne
- Date: 2010
- Subjects: Radiography, Medical -- Exposure , Radiography, Medical -- Image quality , Radiography, Medical -- South Africa , Diagnostic imaging -- South Africa
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: vital:10076 , http://hdl.handle.net/10948/1168 , Radiography, Medical -- Exposure , Radiography, Medical -- Image quality , Radiography, Medical -- South Africa , Diagnostic imaging -- South Africa
- Description: This study discusses reject film analyses (RFAs) before and after the implementation of a quality improvement intervention. RFAs were undertaken to investigate the effect of the introduction and use of exposure charts (ECs) on department and student reject rates of extremity radiographs. Methods: A quantitative comparative pre and post-treatment research design was used. Data was collected from the x-ray departments of two training hospitals in Windhoek, Namibia over a five month period. A retrospective RFA was conducted to determine the department and student reject rates for both departments before intervention. Emphasis was placed on exposure related reject films. ECs were compiled and introduced at Katutura State Hospital (venue B) by the researcher. The students were instructed to use these charts. At Windhoek Central Hospital (venue A) no ECs were used. A prospective RFA was conducted to establish department and student reject rates at both hospitals after the intervention at venue B. Results: During the retrospective phase the department reject rate for venue A was 21 percent while the student reject rate was 23 percent. At venue B 24 percent and 26 percent were scored respectively. Students at venue A produced rejected radiographs due to overexposure (49 percent) and underexposure (23 percent), whilst 37 percent was recorded for both causes at venue B. At venue A, 35 percent of films were rejected due to incorrect mAs selection, at venue B the figure was 42 percent. Undiagnostic radiographs due to inaccurate kV selection comprised 62 percent for venue A and 59 percent for venue B. During the prospective phase the department reject rate for venue A was 20 percent and that of the students was 19 percent. For venue B 12 percent and 11 percent were scored respectively. At venue A radiographs rejected due to over and underexposure were 43 percent and 33 percent respectively while those at venue B were 33 percent and 34 percent. Incorrect mAs selection caused 33 percent of discarded films at venue A and 38 percent at venue B. The figures for inaccurate kV selection were 68 percent and 62 percent for venues A and B. Conclusions: The introduction and use of ECs lowered the student reject rate at venue B in the prospective phase.
- Full Text:
- Date Issued: 2010
Relationship between employee knowledge, personal contact and attitudes towards chronically ill co-workers: case of selected organisations within the banking sector
- Authors: Kanengoni, Herbert
- Date: 2010
- Subjects: Attitude (Psychology) , Chronically ill -- South Africa -- Eastern Cape , Banks and banking -- South Africa -- Eastern Cape , Industrial safety -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MCom (Industrial Psychology)
- Identifier: vital:11544 , http://hdl.handle.net/10353/494 , Attitude (Psychology) , Chronically ill -- South Africa -- Eastern Cape , Banks and banking -- South Africa -- Eastern Cape , Industrial safety -- South Africa -- Eastern Cape
- Description: As chronic illnesses continue to be a burden in today’s organisations, it remains a very crucial call for management to find ways to eradicate the associated organisational problems. While people of all ages are affected by chronic illnesses, there is a higher risk of the elderly developing chronic diseases. However, as much as chronic illnesses are inevitable among employees, there should be ways at least to curb negative social and goal achievement impact which they bring in organisations. In this regard, a survey of 80 employees was conducted to examine the relationship between employees' knowledge about, contact with, and attitudes towards their co-employees with chronic illnesses (CI). Results indicated that employees' knowledge about and contact with individuals diagnosed with chronic illnesses were significantly related to better attitudes toward this population. The findings also revealed that knowledge was related to positive attitudes among employees who had more personal contact with individuals with Chronic illnesses (CI) and such findings indicate the importance of exposing employees to information about chronic illnesses and direct practice experience with individuals who have these illnesses. To be noted also is that 39% of the respondents preferred to be exposed to health bulletins and magazines; 18% of the respondents preferred the help of health workers and about a third (30%) favoured brochures, posters and printed materials such as flyers. Managerial implications for employees with chronic illness are discussed
- Full Text:
- Date Issued: 2010
- Authors: Kanengoni, Herbert
- Date: 2010
- Subjects: Attitude (Psychology) , Chronically ill -- South Africa -- Eastern Cape , Banks and banking -- South Africa -- Eastern Cape , Industrial safety -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MCom (Industrial Psychology)
- Identifier: vital:11544 , http://hdl.handle.net/10353/494 , Attitude (Psychology) , Chronically ill -- South Africa -- Eastern Cape , Banks and banking -- South Africa -- Eastern Cape , Industrial safety -- South Africa -- Eastern Cape
- Description: As chronic illnesses continue to be a burden in today’s organisations, it remains a very crucial call for management to find ways to eradicate the associated organisational problems. While people of all ages are affected by chronic illnesses, there is a higher risk of the elderly developing chronic diseases. However, as much as chronic illnesses are inevitable among employees, there should be ways at least to curb negative social and goal achievement impact which they bring in organisations. In this regard, a survey of 80 employees was conducted to examine the relationship between employees' knowledge about, contact with, and attitudes towards their co-employees with chronic illnesses (CI). Results indicated that employees' knowledge about and contact with individuals diagnosed with chronic illnesses were significantly related to better attitudes toward this population. The findings also revealed that knowledge was related to positive attitudes among employees who had more personal contact with individuals with Chronic illnesses (CI) and such findings indicate the importance of exposing employees to information about chronic illnesses and direct practice experience with individuals who have these illnesses. To be noted also is that 39% of the respondents preferred to be exposed to health bulletins and magazines; 18% of the respondents preferred the help of health workers and about a third (30%) favoured brochures, posters and printed materials such as flyers. Managerial implications for employees with chronic illness are discussed
- Full Text:
- Date Issued: 2010
An investigation of the role of records management with specific reference to Amathole District Municipality
- Authors: Kanzi, Noluvuyo
- Date: 2010
- Subjects: Records -- Management -- Amathole District Municipality , Information resources management -- Amathole District Municipality
- Language: English
- Type: Thesis , Masters , MPA
- Identifier: vital:8205 , http://hdl.handle.net/10948/1169 , Records -- Management -- Amathole District Municipality , Information resources management -- Amathole District Municipality
- Description: The purpose of this study was to investigate the role played by records management in an organisation. The primary question that was explored was whether the management of records receives the attention it deserves at the Amathole District Municipality. In order to achieve the research objectives, an in-depth literature study was undertaken. A survey was also conducted to examine the current records management practices at ADM and the data was collected by means of self-administered questionnaires. The literature study proved the hypothesis to be correct, which stated that effective records management plays a significant role in the effective administration of an organization. The empirical study revealed that the records management function is not receiving the attention it deserves at ADM. Even though participants acknowledged the importance of records management in the decision-making process, strategic planning process (Integrated Development Plan), the realisation of the Batho Pele Principles and the overall performance of ADM, it was evident that ignorance was displayed with regard to the management of records. It has been discovered that Amathole District Municipality has a good Records Management Policy, Procedure manual and File Plan, but adherence to these policies should be continuously monitored. Regular training has been identified as one of the areas on which ADM should apply its focus to ensure sound records management. Recommendations were made within the context of empirical survey findings and the regulatory framework for records management. To improve the current records management practices at ADM, it has been recommended that the records management function be incorporated into the organisation-wide strategic plans and that records management forms part of the key performance areas of senior managers.
- Full Text:
- Date Issued: 2010
- Authors: Kanzi, Noluvuyo
- Date: 2010
- Subjects: Records -- Management -- Amathole District Municipality , Information resources management -- Amathole District Municipality
- Language: English
- Type: Thesis , Masters , MPA
- Identifier: vital:8205 , http://hdl.handle.net/10948/1169 , Records -- Management -- Amathole District Municipality , Information resources management -- Amathole District Municipality
- Description: The purpose of this study was to investigate the role played by records management in an organisation. The primary question that was explored was whether the management of records receives the attention it deserves at the Amathole District Municipality. In order to achieve the research objectives, an in-depth literature study was undertaken. A survey was also conducted to examine the current records management practices at ADM and the data was collected by means of self-administered questionnaires. The literature study proved the hypothesis to be correct, which stated that effective records management plays a significant role in the effective administration of an organization. The empirical study revealed that the records management function is not receiving the attention it deserves at ADM. Even though participants acknowledged the importance of records management in the decision-making process, strategic planning process (Integrated Development Plan), the realisation of the Batho Pele Principles and the overall performance of ADM, it was evident that ignorance was displayed with regard to the management of records. It has been discovered that Amathole District Municipality has a good Records Management Policy, Procedure manual and File Plan, but adherence to these policies should be continuously monitored. Regular training has been identified as one of the areas on which ADM should apply its focus to ensure sound records management. Recommendations were made within the context of empirical survey findings and the regulatory framework for records management. To improve the current records management practices at ADM, it has been recommended that the records management function be incorporated into the organisation-wide strategic plans and that records management forms part of the key performance areas of senior managers.
- Full Text:
- Date Issued: 2010
Consolidating democracy through integrating the chieftainship institution with elected councils in Lesotho: a case study of four community councils in Maseru
- Authors: Kapa, Motlamelle Anthony
- Date: 2010
- Subjects: Customary law -- Lesotho Constitutional law -- Lesotho Local government -- Lesotho -- Maseru Culture and law -- Lesotho -- Maseru Lesotho -- Politics and government Democracy -- Lesotho
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:2786 , http://hdl.handle.net/10962/d1002996
- Description: This study analyses the relationship between the chieftainship institution and the elected councils in Lesotho. Based on a qualitative case study method the study seeks to understand this relationship in four selected councils in the Maseru district and how this can be nurtured to achieve a consolidated democracy. Contrary to modernists‟ arguments (that indigenous African political institutions, of which the chieftainship is part, are incompatible with liberal democracy since they are, inter alia, hereditary, they compete with their elective counterparts for political power, they threaten the democratic consolidation process, and they are irrelevant to democratising African systems), this study finds that these arguments are misplaced. Instead, chieftainship is not incompatible with liberal democracy per se. It supports the democratisation process (if the governing parties pursue friendly and accommodative policies to it) but uses its political agency in reaction to the policies of ruling parties to protect its survival interests, whether or not this undermines democratic consolidation process. The chieftainship has also acted to defend democracy when the governing party abuses its political power to undermine democratic rule. It performs important functions in the country. Thus, it is still viewed by the country‟s political leadership, academics, civil society, and councillors as legitimate and highly relevant to the Lesotho‟s contemporary political system. Because of the inadequacies of the government policies and the ambiguous chieftainship-councils integration model, which tend to marginalise the chieftainship and threaten its survival, its relationship with the councils was initially characterised by conflict. However, this relationship has improved, due to the innovative actions taken not by the central government, but by the individual Councils and chiefs themselves, thus increasing the prospects for democratic consolidation. I argue for and recommend the adoption in Lesotho of appropriate variants of the mixed government model to integrate the chieftainship with the elected councils, based on the re-contextualised and re-territorialised conception and practice of democracy, which eschews its universalistic EuroAmerican version adopted by the LCD government, but recognises and preserves the chieftainship as an integral part of the Basotho society, the embodiment of its culture, history, national identity and nationhood.
- Full Text:
- Date Issued: 2010
- Authors: Kapa, Motlamelle Anthony
- Date: 2010
- Subjects: Customary law -- Lesotho Constitutional law -- Lesotho Local government -- Lesotho -- Maseru Culture and law -- Lesotho -- Maseru Lesotho -- Politics and government Democracy -- Lesotho
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:2786 , http://hdl.handle.net/10962/d1002996
- Description: This study analyses the relationship between the chieftainship institution and the elected councils in Lesotho. Based on a qualitative case study method the study seeks to understand this relationship in four selected councils in the Maseru district and how this can be nurtured to achieve a consolidated democracy. Contrary to modernists‟ arguments (that indigenous African political institutions, of which the chieftainship is part, are incompatible with liberal democracy since they are, inter alia, hereditary, they compete with their elective counterparts for political power, they threaten the democratic consolidation process, and they are irrelevant to democratising African systems), this study finds that these arguments are misplaced. Instead, chieftainship is not incompatible with liberal democracy per se. It supports the democratisation process (if the governing parties pursue friendly and accommodative policies to it) but uses its political agency in reaction to the policies of ruling parties to protect its survival interests, whether or not this undermines democratic consolidation process. The chieftainship has also acted to defend democracy when the governing party abuses its political power to undermine democratic rule. It performs important functions in the country. Thus, it is still viewed by the country‟s political leadership, academics, civil society, and councillors as legitimate and highly relevant to the Lesotho‟s contemporary political system. Because of the inadequacies of the government policies and the ambiguous chieftainship-councils integration model, which tend to marginalise the chieftainship and threaten its survival, its relationship with the councils was initially characterised by conflict. However, this relationship has improved, due to the innovative actions taken not by the central government, but by the individual Councils and chiefs themselves, thus increasing the prospects for democratic consolidation. I argue for and recommend the adoption in Lesotho of appropriate variants of the mixed government model to integrate the chieftainship with the elected councils, based on the re-contextualised and re-territorialised conception and practice of democracy, which eschews its universalistic EuroAmerican version adopted by the LCD government, but recognises and preserves the chieftainship as an integral part of the Basotho society, the embodiment of its culture, history, national identity and nationhood.
- Full Text:
- Date Issued: 2010
An organization development intervention in a Namibian rural school in Ohanguena region
- Authors: Kashikatu, Lukas
- Date: 2010
- Subjects: Action research in education -- Namibia Organizational change -- Namibia School improvement programs -- Namibia Educational change -- Namibia -- Case studies Rural schools -- Namibia School management and organization -- Namibia
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1684 , http://hdl.handle.net/10962/d1003567
- Description: Post independent Namibia adopted a decentralization policy which involved the transfer of decision-making powers and administrative authority from central government to government institutions, including schools, with a view to improving quality. However, despite new educational policies, Namibian educators continue to operate in a non-participatory manner and are unprepared for their role as change agents. This has created tension between the espoused benefits of decentralizing and the reality in schools. In such a turbulent situation schools need to be helped to understand the complexity of change in order to adapt, and OD plays a crucial role in this regard. OD is a consciously thought of and systematically implemented organization-wide improvement effort which aims at increasing organizational effectiveness and health through action research. Rather than a top-down change approach, the OD practice adopts a bottom-up approach to change. This study introduced and investigated an OD intervention in a Namibian rural school in Ohanguena Education Region, with the purpose of exploring participants’ perceptions and experience of the process and of the possible short-term outcome of the intervention. Its findings could be of significance to educators, organizations and future OD esearchers. The study is an action research case study located in the interpretive and critical paradigms. Multiple data collection tools were used during this study, namely observations, structured one-to-one interviews and focus group interviews. Interpretive analysis was used as the data analysis approach. The study found that despite OD being new to participants, it was embraced as a change strategy as it made significant impact on their understanding of organizations and conception of change which is radically different from the common top-down approach to change. The intervention further empowered participants with new skills of initiating change and problem-solving strategies. Apart from that, the intervention yielded a positive short-term outcome which motivated participants to adopt and apply OD in the future without underestimating challenges associated with the process.
- Full Text:
- Date Issued: 2010
- Authors: Kashikatu, Lukas
- Date: 2010
- Subjects: Action research in education -- Namibia Organizational change -- Namibia School improvement programs -- Namibia Educational change -- Namibia -- Case studies Rural schools -- Namibia School management and organization -- Namibia
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1684 , http://hdl.handle.net/10962/d1003567
- Description: Post independent Namibia adopted a decentralization policy which involved the transfer of decision-making powers and administrative authority from central government to government institutions, including schools, with a view to improving quality. However, despite new educational policies, Namibian educators continue to operate in a non-participatory manner and are unprepared for their role as change agents. This has created tension between the espoused benefits of decentralizing and the reality in schools. In such a turbulent situation schools need to be helped to understand the complexity of change in order to adapt, and OD plays a crucial role in this regard. OD is a consciously thought of and systematically implemented organization-wide improvement effort which aims at increasing organizational effectiveness and health through action research. Rather than a top-down change approach, the OD practice adopts a bottom-up approach to change. This study introduced and investigated an OD intervention in a Namibian rural school in Ohanguena Education Region, with the purpose of exploring participants’ perceptions and experience of the process and of the possible short-term outcome of the intervention. Its findings could be of significance to educators, organizations and future OD esearchers. The study is an action research case study located in the interpretive and critical paradigms. Multiple data collection tools were used during this study, namely observations, structured one-to-one interviews and focus group interviews. Interpretive analysis was used as the data analysis approach. The study found that despite OD being new to participants, it was embraced as a change strategy as it made significant impact on their understanding of organizations and conception of change which is radically different from the common top-down approach to change. The intervention further empowered participants with new skills of initiating change and problem-solving strategies. Apart from that, the intervention yielded a positive short-term outcome which motivated participants to adopt and apply OD in the future without underestimating challenges associated with the process.
- Full Text:
- Date Issued: 2010
An investigation of the role of principals in promoting computer usage in selected Namibian schools
- Authors: Katulo, Mighty Masiku
- Date: 2010
- Subjects: Computers -- Study and teaching -- Namibia Educational technology -- Namibia Information technology -- Namibia
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1658 , http://hdl.handle.net/10962/d1003541
- Description: Globalisation and technology change have created a new global economy fuelled by information and driven by knowledge. Information and Communication Technologies (ICT) have been touted as potential powerful tools for enabling educational change and reform. Namibia is among those countries that have adopted the use of ICTs as a vehicle for change. This thesis explores the role of school principals in promoting and managing computer usage in selected schools in Namibia. The study was conducted at four schools in the Caprivi Region. The study employed a qualitative case study to collect and analyse data. A total of four school principals and four computer coordinators were interviewed, and responded to questions pertaining to the role of principals in the following areas: acquiring ICT equipment; providing access to the computer labs; promoting the use of computers; maintaining computers; capacity-building of teachers, and addressing challenges that could prevent computer usage. Two focus group interviews were also conducted at two schools, to find out what they perceived to be the role of school principals in supporting and ensuring the effective use of computers in schools. The findings on acquisition of computers reveal that principals were often the initiators of the acquisition process. Ministerial deployment is the most common form of acquisition, followed by the use of the school’s development fund to purchase administrative computers. Only one of the participating schools did not acquire its computers through Ministerial deployment. Some schools were more resourced than others. Availability and maintenance of equipment depended on the kind of school (advantaged or disadvantaged) and the way the computers were acquired rather than on the role of the principal. Schools that acquired their computers through the ministerial deployment received satisfactory technical support from the ministry while schools that acquired their computers through other sources had to rely more heavily on the principal to pro-actively seek support. School principals that demonstrated the qualities of transformational leadership promoted the usage of computers by taking part in training offered to teachers and encouraged teachers on different platforms to make use of computers. The study also found that schools in which principals actively supported and promoted the use of computers were successful in the usage of the computer labs, while in schools where principals left the running of the computer lab to an individual teacher, the usage was minimal. It was found that a number of challenges are hampering the usage. These include lack of internet connectivity, qualified personnel to cascade training, and minimum infrastructure. The study recommends that school principals should adopt trategies that encourage teachers to use computers in their daily routines. It also makes suggestions for further research on the impact of school culture on ICT integration.
- Full Text:
- Date Issued: 2010
- Authors: Katulo, Mighty Masiku
- Date: 2010
- Subjects: Computers -- Study and teaching -- Namibia Educational technology -- Namibia Information technology -- Namibia
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1658 , http://hdl.handle.net/10962/d1003541
- Description: Globalisation and technology change have created a new global economy fuelled by information and driven by knowledge. Information and Communication Technologies (ICT) have been touted as potential powerful tools for enabling educational change and reform. Namibia is among those countries that have adopted the use of ICTs as a vehicle for change. This thesis explores the role of school principals in promoting and managing computer usage in selected schools in Namibia. The study was conducted at four schools in the Caprivi Region. The study employed a qualitative case study to collect and analyse data. A total of four school principals and four computer coordinators were interviewed, and responded to questions pertaining to the role of principals in the following areas: acquiring ICT equipment; providing access to the computer labs; promoting the use of computers; maintaining computers; capacity-building of teachers, and addressing challenges that could prevent computer usage. Two focus group interviews were also conducted at two schools, to find out what they perceived to be the role of school principals in supporting and ensuring the effective use of computers in schools. The findings on acquisition of computers reveal that principals were often the initiators of the acquisition process. Ministerial deployment is the most common form of acquisition, followed by the use of the school’s development fund to purchase administrative computers. Only one of the participating schools did not acquire its computers through Ministerial deployment. Some schools were more resourced than others. Availability and maintenance of equipment depended on the kind of school (advantaged or disadvantaged) and the way the computers were acquired rather than on the role of the principal. Schools that acquired their computers through the ministerial deployment received satisfactory technical support from the ministry while schools that acquired their computers through other sources had to rely more heavily on the principal to pro-actively seek support. School principals that demonstrated the qualities of transformational leadership promoted the usage of computers by taking part in training offered to teachers and encouraged teachers on different platforms to make use of computers. The study also found that schools in which principals actively supported and promoted the use of computers were successful in the usage of the computer labs, while in schools where principals left the running of the computer lab to an individual teacher, the usage was minimal. It was found that a number of challenges are hampering the usage. These include lack of internet connectivity, qualified personnel to cascade training, and minimum infrastructure. The study recommends that school principals should adopt trategies that encourage teachers to use computers in their daily routines. It also makes suggestions for further research on the impact of school culture on ICT integration.
- Full Text:
- Date Issued: 2010
Visual based finger interactions for mobile phones
- Authors: Kerr, Simon
- Date: 2010 , 2010-03-15
- Subjects: User interfaces (Computer systems) , Mobile communication systems -- Design and construction , Cell phones -- Software , Mobile communication systems -- Technological innovations , Information display systems , Cell phones -- Technological innovations
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4652 , http://hdl.handle.net/10962/d1006621 , User interfaces (Computer systems) , Mobile communication systems -- Design and construction , Cell phones -- Software , Mobile communication systems -- Technological innovations , Information display systems , Cell phones -- Technological innovations
- Description: Vision based technology such as motion detection has long been limited to the domain of powerful processor intensive systems such as desktop PCs and specialist hardware solutions. With the advent of much faster mobile phone processors and memory, a plethora of feature rich software and hardware is being deployed onto the mobile platform, most notably onto high powered devices called smart phones. Interaction interfaces such as touchscreens allow for improved usability but obscure the phone’s screen. Since the majority of smart phones are equipped with cameras, it has become feasible to combine their powerful processors, large memory capacity and the camera to support new ways of interacting with the phone which do not obscure the screen. However, it is not clear whether or not these processor intensive visual interactions can in fact be run at an acceptable speed on current mobile handsets or whether they will offer the user a better experience than the current number pad and direction keys present on the majority of mobile phones. A vision based finger interaction technique is proposed which uses the back of device camera to track the user’s finger. This allows the user to interact with the mobile phone with mouse based movements, gestures and steering based interactions. A simple colour thresholding algorithm was implemented in Java, Python and C++. Various benchmarks and tests conducted on a Nokia N95 smart phone revealed that on current hardware and with current programming environments only native C++ yields results plausible for real time interactions (a key requirement for vision based interactions). It is also shown that different lighting levels and background environments affects the accuracy of the system with background and finger contrast playing a large role. Finally a user study was conducted to ascertain the overall user’s satisfaction between keypad interactions and the finger interaction techniques concluding that the new finger interaction technique is well suited to steering based interactions and in time, mouse style movements. Simple navigation is better suited to the directional keypad.
- Full Text:
- Date Issued: 2010
- Authors: Kerr, Simon
- Date: 2010 , 2010-03-15
- Subjects: User interfaces (Computer systems) , Mobile communication systems -- Design and construction , Cell phones -- Software , Mobile communication systems -- Technological innovations , Information display systems , Cell phones -- Technological innovations
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4652 , http://hdl.handle.net/10962/d1006621 , User interfaces (Computer systems) , Mobile communication systems -- Design and construction , Cell phones -- Software , Mobile communication systems -- Technological innovations , Information display systems , Cell phones -- Technological innovations
- Description: Vision based technology such as motion detection has long been limited to the domain of powerful processor intensive systems such as desktop PCs and specialist hardware solutions. With the advent of much faster mobile phone processors and memory, a plethora of feature rich software and hardware is being deployed onto the mobile platform, most notably onto high powered devices called smart phones. Interaction interfaces such as touchscreens allow for improved usability but obscure the phone’s screen. Since the majority of smart phones are equipped with cameras, it has become feasible to combine their powerful processors, large memory capacity and the camera to support new ways of interacting with the phone which do not obscure the screen. However, it is not clear whether or not these processor intensive visual interactions can in fact be run at an acceptable speed on current mobile handsets or whether they will offer the user a better experience than the current number pad and direction keys present on the majority of mobile phones. A vision based finger interaction technique is proposed which uses the back of device camera to track the user’s finger. This allows the user to interact with the mobile phone with mouse based movements, gestures and steering based interactions. A simple colour thresholding algorithm was implemented in Java, Python and C++. Various benchmarks and tests conducted on a Nokia N95 smart phone revealed that on current hardware and with current programming environments only native C++ yields results plausible for real time interactions (a key requirement for vision based interactions). It is also shown that different lighting levels and background environments affects the accuracy of the system with background and finger contrast playing a large role. Finally a user study was conducted to ascertain the overall user’s satisfaction between keypad interactions and the finger interaction techniques concluding that the new finger interaction technique is well suited to steering based interactions and in time, mouse style movements. Simple navigation is better suited to the directional keypad.
- Full Text:
- Date Issued: 2010
Formulation and evaluation of captopril loaded polymethacrylate and hydroxypropyl methycellulose microcapsules
- Khamanga, Sandile Maswazi Malungelo
- Authors: Khamanga, Sandile Maswazi Malungelo
- Date: 2010
- Subjects: Hypertension -- Treatment , Hypertension -- Chemotherapy , Angiotensin converting enzyme -- Inhibitors , Hypotensive agents -- Development , Pharmacokinetics
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:3860 , http://hdl.handle.net/10962/d1013443
- Description: Angiotensin-converting enzyme (ACE) inhibitors are some of the most commonly prescribed medications for hypertension. They are cited in many papers as the treatment most often recommended by guidelines and favoured over other antihypertensive drugs as first-line agents especially when other high-risk conditions are present, such as diabetic nephropathy. The development of captopril (CPT) was amongst the earliest successes of the revolutionary concept of structure-based drug design. Due to its relatively poor pharmacokinetic profile or short half-life of about 1 hour, the formulation of sustained-release microcapsule dosage form is useful to improve patient compliance and to achieve predictable and optimized therapeutic plasma concentrations. Currently, CPT is mainly administered in tablet form. One of the difficulties of CPT formulation has been reported to be its instability in aqueous solutions. CPT is characterized by a lack of a strong chromophore and, therefore, not able to absorb at the more useful UV–Vis region of the spectrum. For this reason, an accurate, simple, reproducible, and sensitive HPLC-ECD method was developed and validated for the determination of CPT in dosage forms. The method was successfully applied for the determination of CPT in commercial and developed formulations. Possible drug-excipient and excipient-excipient interactions were investigated prior to formulating CPT microcapsules because successful formulation of a stable and effective solid dosage form depends on careful selection of excipients. Nuclear magnetic resonance spectroscopy, Fourier transform infra-red spectroscopy (FT-IR), differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) were used for the identification and purity testing of CPT and excipients. The studies revealed no thermal changes during stress testing of binary and whole mixtures which indicate absence of solid state interactions. There were no shifts, appearance and disappearance in the endothermic or exothermic peaks and on the change of other associated enthalpy values on thermal curves obtained with DSC method. Characteristic peaks for common functional groups in the FT-IR were present in all the mixtures indicating the absence of incompatibility. The techniques used in this study can be said to have been efficient in the characterization and evaluation of the drug and excipients. The technique of microencapsulation by oil-in-oil was used to prepare CPT microcapsules. The effects of polymer molecular weight, homogenizing speed on the particle size, flow properties, morphology, surface properties and release characteristics of the prepared CPT microcapsules were examined. In order to decrease the complexity of the analysis and reduce cost response surface methodology using best polynomial equations was successfully used to quantify the effect of the formulation variables and develop an optimized formulation thereby minimizing the number of experimental trials. There was a burst effect during the first stage of dissolution. Scanning electron microscopy (SEM) results indicated that the initial burst effect observed in drug release could be attributed to dissolution of CPT crystals present at the surface or embedded in the superficial layer of the matrix. During the preparation of microcapsules, the drug might have been trapped near the surface of the microcapsules and or might have diffused quickly through the porous surface. The release kinetics of CPT from most formulations followed Fickian diffusion mechanism. SEM photographs showed that diffusion took place through pores at the surface of the microcapsules. The Kopcha model diffusion and erosion terms showed predominance of diffusion relative to swelling or erosion throughout the entire test period. Drug release mechanism was also confirmed by Makoid-Banakar and Korsmeyer-Peppas models exponents which further support diffusion release mechanism in most formulations. The models postulate that the total of drug release is a summation of a couple of mechanisms; burst release, relaxation induced controlled-release and diffusional release. Inspection of the 2D contour and 3D response surfaces allowed the determination of the geometrical nature of the surfaces and further providing results about the interaction of the different variables used in central composite design (CCD). The wide variation indicated that the factor combinations resulted in different drug release rates. Lagrange, canonical and mathematical modelling were used to determine the nature of the stationery point of the models. This represented the optimal variables or stationery points where there is interaction in the experimental space. It is difficult to understand the shape of a fitted response by mere inspection of the algebraic polynomial when there are many independent variables in the model. Canonical and Lagrange analyses facilitated the interpretation of the surface plots after a mathematical transformation of the original variables into new variables. In conclusion, these results suggest the potential application of Eudragit® / Methocel® microcapsules as suitable sustained-release drug delivery system for CPT.
- Full Text:
- Date Issued: 2010
- Authors: Khamanga, Sandile Maswazi Malungelo
- Date: 2010
- Subjects: Hypertension -- Treatment , Hypertension -- Chemotherapy , Angiotensin converting enzyme -- Inhibitors , Hypotensive agents -- Development , Pharmacokinetics
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:3860 , http://hdl.handle.net/10962/d1013443
- Description: Angiotensin-converting enzyme (ACE) inhibitors are some of the most commonly prescribed medications for hypertension. They are cited in many papers as the treatment most often recommended by guidelines and favoured over other antihypertensive drugs as first-line agents especially when other high-risk conditions are present, such as diabetic nephropathy. The development of captopril (CPT) was amongst the earliest successes of the revolutionary concept of structure-based drug design. Due to its relatively poor pharmacokinetic profile or short half-life of about 1 hour, the formulation of sustained-release microcapsule dosage form is useful to improve patient compliance and to achieve predictable and optimized therapeutic plasma concentrations. Currently, CPT is mainly administered in tablet form. One of the difficulties of CPT formulation has been reported to be its instability in aqueous solutions. CPT is characterized by a lack of a strong chromophore and, therefore, not able to absorb at the more useful UV–Vis region of the spectrum. For this reason, an accurate, simple, reproducible, and sensitive HPLC-ECD method was developed and validated for the determination of CPT in dosage forms. The method was successfully applied for the determination of CPT in commercial and developed formulations. Possible drug-excipient and excipient-excipient interactions were investigated prior to formulating CPT microcapsules because successful formulation of a stable and effective solid dosage form depends on careful selection of excipients. Nuclear magnetic resonance spectroscopy, Fourier transform infra-red spectroscopy (FT-IR), differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) were used for the identification and purity testing of CPT and excipients. The studies revealed no thermal changes during stress testing of binary and whole mixtures which indicate absence of solid state interactions. There were no shifts, appearance and disappearance in the endothermic or exothermic peaks and on the change of other associated enthalpy values on thermal curves obtained with DSC method. Characteristic peaks for common functional groups in the FT-IR were present in all the mixtures indicating the absence of incompatibility. The techniques used in this study can be said to have been efficient in the characterization and evaluation of the drug and excipients. The technique of microencapsulation by oil-in-oil was used to prepare CPT microcapsules. The effects of polymer molecular weight, homogenizing speed on the particle size, flow properties, morphology, surface properties and release characteristics of the prepared CPT microcapsules were examined. In order to decrease the complexity of the analysis and reduce cost response surface methodology using best polynomial equations was successfully used to quantify the effect of the formulation variables and develop an optimized formulation thereby minimizing the number of experimental trials. There was a burst effect during the first stage of dissolution. Scanning electron microscopy (SEM) results indicated that the initial burst effect observed in drug release could be attributed to dissolution of CPT crystals present at the surface or embedded in the superficial layer of the matrix. During the preparation of microcapsules, the drug might have been trapped near the surface of the microcapsules and or might have diffused quickly through the porous surface. The release kinetics of CPT from most formulations followed Fickian diffusion mechanism. SEM photographs showed that diffusion took place through pores at the surface of the microcapsules. The Kopcha model diffusion and erosion terms showed predominance of diffusion relative to swelling or erosion throughout the entire test period. Drug release mechanism was also confirmed by Makoid-Banakar and Korsmeyer-Peppas models exponents which further support diffusion release mechanism in most formulations. The models postulate that the total of drug release is a summation of a couple of mechanisms; burst release, relaxation induced controlled-release and diffusional release. Inspection of the 2D contour and 3D response surfaces allowed the determination of the geometrical nature of the surfaces and further providing results about the interaction of the different variables used in central composite design (CCD). The wide variation indicated that the factor combinations resulted in different drug release rates. Lagrange, canonical and mathematical modelling were used to determine the nature of the stationery point of the models. This represented the optimal variables or stationery points where there is interaction in the experimental space. It is difficult to understand the shape of a fitted response by mere inspection of the algebraic polynomial when there are many independent variables in the model. Canonical and Lagrange analyses facilitated the interpretation of the surface plots after a mathematical transformation of the original variables into new variables. In conclusion, these results suggest the potential application of Eudragit® / Methocel® microcapsules as suitable sustained-release drug delivery system for CPT.
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- Date Issued: 2010