Guest inclusion behaviour of zirconium(IV)- based polycarboxylate complexes: a study of metal-organic frameworks
- Hulushe, Siyabonga Theophillus
- Authors: Hulushe, Siyabonga Theophillus
- Date: 2018
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/63710 , vital:28474
- Description: Expected release date-April 2019
- Full Text:
- Date Issued: 2018
- Authors: Hulushe, Siyabonga Theophillus
- Date: 2018
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/63710 , vital:28474
- Description: Expected release date-April 2019
- Full Text:
- Date Issued: 2018
Health and fitness of young, healthy adult females and the effect of an eight week pilates intervention
- Authors: Eaton, Lara Lee
- Date: 2018
- Subjects: Physical fitness for women -- South Africa -- Makhanda , Pilates method , Exercise for women -- South Africa -- Makhanda , Exercise -- Health aspects -- South Africa -- Makhanda , Exercise -- Physiological aspects -- South Africa -- Makhanda
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/58267 , vital:27112
- Description: Purpose: The first phase of this study aimed to investigate the health and fitness status of young adult females in the local community. The second phase of this study investigated the impact of an eight week progressive Pilates intervention on selected health and fitness parameters in this cohort. Methods: Healthy young adult females aged 18-26 years (n=96), from the local community, partook in once-off tests including anthropometric measures (stature, body mass, Body Mass Index and waist circumference) as well as fitness parameters including balance, flexibility, muscular strength and endurance, and lastly lumbo-pelvic stability. Health measures investigated included blood pressure and spirometry. Where possible, results were compared to those of similar populations from national surveys or published normative data. Sedentary volunteers from this cohort were then randomised into a Pilates Exercise (PEx, n=12) or an inactive Control (Con, n=11) group, with their results from Phase 1 serving as baseline measures. Pilates classes were held twice weekly (60 minutes per session). All the measures from phase 1 were repeated at weeks 4 and 8. An additional intervention test included Transversus abdominis recruitment. Participants maintained habitual dietary intake and energy expenditure throughout. Nine PEx group and eight Con group participants completed the intervention. Results: The current sample (phase 1) was found to be healthier than comparative populations from national surveys, and significant differences (p<0.05) were found for all comparisons except Forced Expiratory Volume (FEV1), (p=0.64). Physical activity levels (230 min.week-1) exceeded that of the recommend weekly threshold (150 min.week-1). BMI, waist circumference, blood pressure and spirometry measures were all found to be within suggested healthy normal ranges. Pilates significantly improved lumbo-pelvic stability in the PEx group at weeks 4 (p<0.005) and 8 (p<0.002). Similarly, abdominal (p=0.00, d=1.1), upper limb (p=0.037, d=0.9) and lower limb endurance (p=0.02, d=1.0, between group d=0.73 for PEx) also improved with no changes in the Con group. PEx energy expenditure significantly increased from baseline to weeks 4 (p=0.007, d=10.7) and 8 (p=0.027, d=0.64), however body mass was maintained throughout. Conversely, Minute Ventilation decreased in the PEx cohort (p=0.010, d=0.95) from weeks 4 to 8. The Con group showed significant increases in body mass (p=0.018), leg strength (within-group Cohen’s d=-1.08 between weeks 0-8; d=-2 between weeks 4-8) and dynamic balance (p=0.01, d=-0.5). While no within-group changes were observed, Protein intake was significantly greater (p=0.036, d>0.8 at baseline and week 8) in the PEx group throughout the intervention. Medium between-group effect sizes (d>0.5) were noted for PEx BMI and waist circumference measures at all time points. Further, although not significant, the large within-group effect size (d=-0.84) between baseline and week 8 for PEx systolic blood pressure, suggested the 9 mm Hg was meaningful. The same time period also indicated a large within-group effect size (d=-0.8) for PEx dynamic balance, and a medium Cohen’s d for (d=0.57) PEx static balance. Conclusion: The local population of young adult females was found to be significantly healthier than those of comparable national samples. Further, Pilates participation significantly improved lumbo-pelvic stability and muscular endurance with meaningful changes in systolic blood pressure, and balance in previously sedentary young, adult females. Body mass was also maintained.
- Full Text:
- Date Issued: 2018
- Authors: Eaton, Lara Lee
- Date: 2018
- Subjects: Physical fitness for women -- South Africa -- Makhanda , Pilates method , Exercise for women -- South Africa -- Makhanda , Exercise -- Health aspects -- South Africa -- Makhanda , Exercise -- Physiological aspects -- South Africa -- Makhanda
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/58267 , vital:27112
- Description: Purpose: The first phase of this study aimed to investigate the health and fitness status of young adult females in the local community. The second phase of this study investigated the impact of an eight week progressive Pilates intervention on selected health and fitness parameters in this cohort. Methods: Healthy young adult females aged 18-26 years (n=96), from the local community, partook in once-off tests including anthropometric measures (stature, body mass, Body Mass Index and waist circumference) as well as fitness parameters including balance, flexibility, muscular strength and endurance, and lastly lumbo-pelvic stability. Health measures investigated included blood pressure and spirometry. Where possible, results were compared to those of similar populations from national surveys or published normative data. Sedentary volunteers from this cohort were then randomised into a Pilates Exercise (PEx, n=12) or an inactive Control (Con, n=11) group, with their results from Phase 1 serving as baseline measures. Pilates classes were held twice weekly (60 minutes per session). All the measures from phase 1 were repeated at weeks 4 and 8. An additional intervention test included Transversus abdominis recruitment. Participants maintained habitual dietary intake and energy expenditure throughout. Nine PEx group and eight Con group participants completed the intervention. Results: The current sample (phase 1) was found to be healthier than comparative populations from national surveys, and significant differences (p<0.05) were found for all comparisons except Forced Expiratory Volume (FEV1), (p=0.64). Physical activity levels (230 min.week-1) exceeded that of the recommend weekly threshold (150 min.week-1). BMI, waist circumference, blood pressure and spirometry measures were all found to be within suggested healthy normal ranges. Pilates significantly improved lumbo-pelvic stability in the PEx group at weeks 4 (p<0.005) and 8 (p<0.002). Similarly, abdominal (p=0.00, d=1.1), upper limb (p=0.037, d=0.9) and lower limb endurance (p=0.02, d=1.0, between group d=0.73 for PEx) also improved with no changes in the Con group. PEx energy expenditure significantly increased from baseline to weeks 4 (p=0.007, d=10.7) and 8 (p=0.027, d=0.64), however body mass was maintained throughout. Conversely, Minute Ventilation decreased in the PEx cohort (p=0.010, d=0.95) from weeks 4 to 8. The Con group showed significant increases in body mass (p=0.018), leg strength (within-group Cohen’s d=-1.08 between weeks 0-8; d=-2 between weeks 4-8) and dynamic balance (p=0.01, d=-0.5). While no within-group changes were observed, Protein intake was significantly greater (p=0.036, d>0.8 at baseline and week 8) in the PEx group throughout the intervention. Medium between-group effect sizes (d>0.5) were noted for PEx BMI and waist circumference measures at all time points. Further, although not significant, the large within-group effect size (d=-0.84) between baseline and week 8 for PEx systolic blood pressure, suggested the 9 mm Hg was meaningful. The same time period also indicated a large within-group effect size (d=-0.8) for PEx dynamic balance, and a medium Cohen’s d for (d=0.57) PEx static balance. Conclusion: The local population of young adult females was found to be significantly healthier than those of comparable national samples. Further, Pilates participation significantly improved lumbo-pelvic stability and muscular endurance with meaningful changes in systolic blood pressure, and balance in previously sedentary young, adult females. Body mass was also maintained.
- Full Text:
- Date Issued: 2018
Historical analysis of leadership styles of headmasters at Kingswood College from 1993 to 2017
- Authors: Howden, Ryan Bradley
- Date: 2018
- Subjects: Educational leadership -- South Africa -- Makhanda -- Case studies , Kingswood College -- History , Educational change -- South Africa -- Makhanda , School principals-- South Africa -- Makhanda , Transformational leadership -- South Africa -- Makhanda , Private schools -- Business management , Full Range Leadership
- Language: English
- Type: text , Thesis , Masters , MBA
- Identifier: http://hdl.handle.net/10962/62133 , vital:28131
- Description: A significant interest in school educational leadership has developed over the past two decades, whereby effective leadership is required in a continually changing educational environment. This study is a historical analysis of leadership styles of headmasters at Kingswood College in Grahamstown (Eastern Cape, South Africa) from 1993 to 2017. The aim is to identify leadership style(s) of headmasters using the Full Range Leadership (FRL) model as a guiding framework; to describe and interpret these style(s) in relation to the headmaster’s tenure; and to compare the headmasters’ leadership styles, noting key similarities and differences. The research method consists of interviews and a historical archival analysis. The researcher’s expectation is that headmasters will elicit a transformational leadership approach. Key findings were somewhat consistent with this hypothesis, as headmasters exhibit a general trend towards transformational leadership; although each headmaster identifies with a unique facet of transformational leadership, together with relevant supporting leadership style(s) that emerged from the data. Upon comparing headmasters, their primary leadership styles were as follows: Wilkinson identified with transactional, transformational and servant leadership; Hawke showed evidence of a transformational servant leader; Arguile elicited transformational and principle-based leadership; and Trafford depicted transformational and participative leadership. The researcher found that multiple factors in an ever-changing educational environment promoted the need for transformational leadership. The relationship between business management and educational leadership emerges as a key reflection, thus further research is required in this regard.
- Full Text:
- Date Issued: 2018
- Authors: Howden, Ryan Bradley
- Date: 2018
- Subjects: Educational leadership -- South Africa -- Makhanda -- Case studies , Kingswood College -- History , Educational change -- South Africa -- Makhanda , School principals-- South Africa -- Makhanda , Transformational leadership -- South Africa -- Makhanda , Private schools -- Business management , Full Range Leadership
- Language: English
- Type: text , Thesis , Masters , MBA
- Identifier: http://hdl.handle.net/10962/62133 , vital:28131
- Description: A significant interest in school educational leadership has developed over the past two decades, whereby effective leadership is required in a continually changing educational environment. This study is a historical analysis of leadership styles of headmasters at Kingswood College in Grahamstown (Eastern Cape, South Africa) from 1993 to 2017. The aim is to identify leadership style(s) of headmasters using the Full Range Leadership (FRL) model as a guiding framework; to describe and interpret these style(s) in relation to the headmaster’s tenure; and to compare the headmasters’ leadership styles, noting key similarities and differences. The research method consists of interviews and a historical archival analysis. The researcher’s expectation is that headmasters will elicit a transformational leadership approach. Key findings were somewhat consistent with this hypothesis, as headmasters exhibit a general trend towards transformational leadership; although each headmaster identifies with a unique facet of transformational leadership, together with relevant supporting leadership style(s) that emerged from the data. Upon comparing headmasters, their primary leadership styles were as follows: Wilkinson identified with transactional, transformational and servant leadership; Hawke showed evidence of a transformational servant leader; Arguile elicited transformational and principle-based leadership; and Trafford depicted transformational and participative leadership. The researcher found that multiple factors in an ever-changing educational environment promoted the need for transformational leadership. The relationship between business management and educational leadership emerges as a key reflection, thus further research is required in this regard.
- Full Text:
- Date Issued: 2018
How the roles of CEO's differ in response to different circumstances and in the context of succession: Anglo American-a case study
- Authors: Ball, Leslie
- Date: 2018
- Subjects: Organizational change , Strategic planning , Executive succession , Anglo American Corporation of South Africa, ltd.
- Language: English
- Type: text , Thesis , Masters , MBA
- Identifier: http://hdl.handle.net/10962/60799 , vital:27832
- Description: A review of the literature revealed that firms are inherently influenced by leadership in the upper echelons of the organization. The seminal paper of Hambrick and Mason (1984) has sparked much interest in the realm of organizational leadership. Studies involving organizational leadership have concentrated on leadership styles, the manner in which leadership takes place, leadership succession and organizational performance in an attempt to understand the dynamics of the senior leadership of organizations. Research has also explored how changes in the top management of firms has impacted its performance. This research has primarily been concerned with how a firm is impacted, once succession takes place, and has focused on financial performance, change in strategy and stockholder reaction (Shen & Cannella, 2002; Barron, Chulkov & Waddell, 2011; Friedman & Singh, 1989). Although their predisposition will largely influence the manner in which the incoming CEO acts, the literature has largely neglected the role the incoming CEO must fulfil, and how he/she steers the company, once appointed. In response, the following aim was developed to address this gap: To describe how the roles of two CEO's of the same company differed, during different time periods. The CEO assumes various strategic leadership roles, which they carry out in the context of their new environment once succession has taken place. From the literature, six strategic leadership roles were identified, which formed the foundation of this study. These were strategy formulation, strategy implementation, developing organizational culture, emphasizing ethical practices, managing the firm's resource portfolio and establishing balanced controls. The study set out to comparatively analyze two CEO's of the same firm during different periods. Both CEO's were investigated from the perspective of strategic leadership roles, allowing a comparison of their behaviour. The study analyses and describes these roles, and how they differed between the CEO's, in reaction to differing situational factors and in the context of succession. The study employed a deductive qualitative case study research design. This allowed the researcher to examine the complex phenomenon which have previously been studied at a more superficial level using quantitative methods (Baxter & Jack, 2008; Parrino, 1997; Jooste & Fourie, 2009). A qualitative methodological approach allowed the researcher to examine the topic through a lens which takes into account human variables and processes (Baxter & Jack, 2008). Data was sampled using purposive and convenience sampling while applying the critical incident technique. Data was collected through information sources such as news articles, press releases, annual reports, online interviews, news websites and other documents. Thematical analysis was used during the analysis phase of the study and allowed for patterns and links to be drawn between the collected data. The succession from one CEO to the next served as the comparative element of the study, which allowed for a contrasting of how both CEO's carried out their strategic leadership roles by adapting to their environment, and how they guided the strategic trajectory of the company. The study also took into account what both CEO's were confronted with at the start of their tenure and how this influenced how they carried out their leadership roles. It was found that Cynthia Carroll exercised her roles in a manner which addressed ethical and stakeholder engagement issues within the business. This was translated directly into how she guided the trajectory of the company. Upon appointment, Mark Cutifani exercised his roles in a manner which addressed the organizational performance and financial well-being of the company. This translated directly into how he shaped Anglo's trajectory in an attempt to better its financial performance. Given how they exercised their strategic roles in the company, each CEO influenced Anglo American's direction in a different way, which in turn, influenced the performance of the organization. It was shown that Cynthia Carroll improved the stakeholder engagement, communication and safety within the company, demonstrating behaviour that emphasized the importance of the ethics of the company. When the business had been carrying out its ethical practices effectively, but underperforming financially, Cutifani demonstrated the roles which would be geared toward resurrecting the organizational performance of the organization. Recommendations are made for further research including applying the same research method to investigate how these roles are carried out in companies which operate in a broad spectrum of industries.
- Full Text:
- Date Issued: 2018
- Authors: Ball, Leslie
- Date: 2018
- Subjects: Organizational change , Strategic planning , Executive succession , Anglo American Corporation of South Africa, ltd.
- Language: English
- Type: text , Thesis , Masters , MBA
- Identifier: http://hdl.handle.net/10962/60799 , vital:27832
- Description: A review of the literature revealed that firms are inherently influenced by leadership in the upper echelons of the organization. The seminal paper of Hambrick and Mason (1984) has sparked much interest in the realm of organizational leadership. Studies involving organizational leadership have concentrated on leadership styles, the manner in which leadership takes place, leadership succession and organizational performance in an attempt to understand the dynamics of the senior leadership of organizations. Research has also explored how changes in the top management of firms has impacted its performance. This research has primarily been concerned with how a firm is impacted, once succession takes place, and has focused on financial performance, change in strategy and stockholder reaction (Shen & Cannella, 2002; Barron, Chulkov & Waddell, 2011; Friedman & Singh, 1989). Although their predisposition will largely influence the manner in which the incoming CEO acts, the literature has largely neglected the role the incoming CEO must fulfil, and how he/she steers the company, once appointed. In response, the following aim was developed to address this gap: To describe how the roles of two CEO's of the same company differed, during different time periods. The CEO assumes various strategic leadership roles, which they carry out in the context of their new environment once succession has taken place. From the literature, six strategic leadership roles were identified, which formed the foundation of this study. These were strategy formulation, strategy implementation, developing organizational culture, emphasizing ethical practices, managing the firm's resource portfolio and establishing balanced controls. The study set out to comparatively analyze two CEO's of the same firm during different periods. Both CEO's were investigated from the perspective of strategic leadership roles, allowing a comparison of their behaviour. The study analyses and describes these roles, and how they differed between the CEO's, in reaction to differing situational factors and in the context of succession. The study employed a deductive qualitative case study research design. This allowed the researcher to examine the complex phenomenon which have previously been studied at a more superficial level using quantitative methods (Baxter & Jack, 2008; Parrino, 1997; Jooste & Fourie, 2009). A qualitative methodological approach allowed the researcher to examine the topic through a lens which takes into account human variables and processes (Baxter & Jack, 2008). Data was sampled using purposive and convenience sampling while applying the critical incident technique. Data was collected through information sources such as news articles, press releases, annual reports, online interviews, news websites and other documents. Thematical analysis was used during the analysis phase of the study and allowed for patterns and links to be drawn between the collected data. The succession from one CEO to the next served as the comparative element of the study, which allowed for a contrasting of how both CEO's carried out their strategic leadership roles by adapting to their environment, and how they guided the strategic trajectory of the company. The study also took into account what both CEO's were confronted with at the start of their tenure and how this influenced how they carried out their leadership roles. It was found that Cynthia Carroll exercised her roles in a manner which addressed ethical and stakeholder engagement issues within the business. This was translated directly into how she guided the trajectory of the company. Upon appointment, Mark Cutifani exercised his roles in a manner which addressed the organizational performance and financial well-being of the company. This translated directly into how he shaped Anglo's trajectory in an attempt to better its financial performance. Given how they exercised their strategic roles in the company, each CEO influenced Anglo American's direction in a different way, which in turn, influenced the performance of the organization. It was shown that Cynthia Carroll improved the stakeholder engagement, communication and safety within the company, demonstrating behaviour that emphasized the importance of the ethics of the company. When the business had been carrying out its ethical practices effectively, but underperforming financially, Cutifani demonstrated the roles which would be geared toward resurrecting the organizational performance of the organization. Recommendations are made for further research including applying the same research method to investigate how these roles are carried out in companies which operate in a broad spectrum of industries.
- Full Text:
- Date Issued: 2018
Human capital and other stories
- Authors: Dludlu, John
- Date: 2018
- Subjects: Short stories, South African (English) -- 21st century , South African fiction (English) -- 21st century
- Language: English
- Type: text , Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/63121 , vital:28365
- Description: My collection of short stories is set mostly in Gauteng and revolves around mainly the lives of the urban, black elite almost three decades after the first non‐racial elections in South Africa. It captures emerging trends and fault lines and enquires into whether South Africa can continue on a different path from that of the rest of the continent. Themes covered in the collection, which still espouses idealism, include the acquisition of power, status and money, the use and abuse of these, as well as the psychosocial effects of money on this group. My writing is inspired by the courageous, inventive and introspective writings of the Drum generation of writers William Bloke Modisane, Nat Nakasa and Can Themba, as well as the use of language and the experimental form of writing as embodied in the work of Lidia Yuknavitch to deal with similarly pressing social issues of the day.
- Full Text:
- Date Issued: 2018
- Authors: Dludlu, John
- Date: 2018
- Subjects: Short stories, South African (English) -- 21st century , South African fiction (English) -- 21st century
- Language: English
- Type: text , Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/63121 , vital:28365
- Description: My collection of short stories is set mostly in Gauteng and revolves around mainly the lives of the urban, black elite almost three decades after the first non‐racial elections in South Africa. It captures emerging trends and fault lines and enquires into whether South Africa can continue on a different path from that of the rest of the continent. Themes covered in the collection, which still espouses idealism, include the acquisition of power, status and money, the use and abuse of these, as well as the psychosocial effects of money on this group. My writing is inspired by the courageous, inventive and introspective writings of the Drum generation of writers William Bloke Modisane, Nat Nakasa and Can Themba, as well as the use of language and the experimental form of writing as embodied in the work of Lidia Yuknavitch to deal with similarly pressing social issues of the day.
- Full Text:
- Date Issued: 2018
I won’t be long
- Mhlambi, Ntombi Kayise Millicent
- Authors: Mhlambi, Ntombi Kayise Millicent
- Date: 2018
- Subjects: Creative writing (Higher education) -- South Africa , South African fiction (English) -- 21st century , South African poetry (English) -- 21st century , Short stories, South African (English) -- 21st century
- Language: English
- Type: text , Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/63603 , vital:28446
- Description: My thesis is a weave of short stories, flash fiction and vignettes of prose-poetry. It uses lyrical, scenic and explorative modes to explore the stories of women, past, present and future, from all walks of life. These women, young and old, struggle to find their way within a ‘world’ characterised as Salithambo (the pink castle) whose structures and survival preys on their bodies. The stories explore the themes of girlhood and maturation, violence (specifically against women), animality, scatology, time, gender roles and expectations, and their rejection. I draw inspiration, stylistically, from Irenosen Okojie’s depiction of beauty and terror in the same sentence; Selah Saterstrom’s fragmented plot and directorial stroke; Taban Lo Liyong & Amos Tutuola’s avant-gardism and amplification of language; Adania Shibli’s sensorial and spare prose, Lyudmila Petrushevskaya, Lily Hoang & Carol Oates’ normalized magic spell, Athena Villaverde & Espido Freire’s imaginative overload of childhood; Shelley Jackson & Chevisa Woods’ construction of body parts as bearing texts or as texts themselves.
- Full Text:
- Date Issued: 2018
- Authors: Mhlambi, Ntombi Kayise Millicent
- Date: 2018
- Subjects: Creative writing (Higher education) -- South Africa , South African fiction (English) -- 21st century , South African poetry (English) -- 21st century , Short stories, South African (English) -- 21st century
- Language: English
- Type: text , Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/63603 , vital:28446
- Description: My thesis is a weave of short stories, flash fiction and vignettes of prose-poetry. It uses lyrical, scenic and explorative modes to explore the stories of women, past, present and future, from all walks of life. These women, young and old, struggle to find their way within a ‘world’ characterised as Salithambo (the pink castle) whose structures and survival preys on their bodies. The stories explore the themes of girlhood and maturation, violence (specifically against women), animality, scatology, time, gender roles and expectations, and their rejection. I draw inspiration, stylistically, from Irenosen Okojie’s depiction of beauty and terror in the same sentence; Selah Saterstrom’s fragmented plot and directorial stroke; Taban Lo Liyong & Amos Tutuola’s avant-gardism and amplification of language; Adania Shibli’s sensorial and spare prose, Lyudmila Petrushevskaya, Lily Hoang & Carol Oates’ normalized magic spell, Athena Villaverde & Espido Freire’s imaginative overload of childhood; Shelley Jackson & Chevisa Woods’ construction of body parts as bearing texts or as texts themselves.
- Full Text:
- Date Issued: 2018
In silico characterization of plasmodial transketolases as potential malaria drug target
- Authors: Boateng, Rita Afriyie
- Date: 2018
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/63540 , vital:28433
- Description: Expected release date-April 2019
- Full Text:
- Date Issued: 2018
- Authors: Boateng, Rita Afriyie
- Date: 2018
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/63540 , vital:28433
- Description: Expected release date-April 2019
- Full Text:
- Date Issued: 2018
In silico study of Plasmodium 1-deoxy-dxylulose 5-phosphate reductoisomerase (DXR) for identification of novel inhibitors from SANCDB
- Authors: Diallo, Bakary N'tji
- Date: 2018
- Subjects: Plasmodium 1-deoxy-dxylulose 5-phosphate reductoisomerase , Isoprenoids , Plasmodium , Antimalarials , Malaria -- Chemotherapy , Molecules -- Models , Molecular dynamics , South African Natural Compounds Database
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/64012 , vital:28523
- Description: Malaria remains a major health concern with a complex parasite constantly developing resistance to the different drugs introduced to treat it, threatening the efficacy of the current ACT treatment recommended by WHO (World Health Organization). Different antimalarial compounds with different mechanisms of action are ideal as this decreases chances of resistance occurring. Inhibiting DXR and consequently the MEP pathway is a good strategy to find a new antimalarial with a novel mode of action. From literature, all the enzymes of the MEP pathway have also been shown to be indispensable for the synthesis of isoprenoids. They have been validated as drug targets and the X-ray structure of each of the enzymes has been solved. DXR is a protein which catalyses the second step of the MEP pathway. There are currently 255 DXR inhibitors in the Binding Database (accessed November 2017) generally based on the fosmidomycin structural scaffold and thus often showing poor drug likeness properties. This study aims to research new DXR inhibitors using in silico techniques. We analysed the protein sequence and built 3D models in close and open conformations for the different Plasmodium sequences. Then SANCDB compounds were screened to identify new potential DXR inhibitors with new chemical scaffolds. Finally, the identified hits were submitted to molecular dynamics studies, preceded by a parameterization of the manganese atom in the protein active site.
- Full Text:
- Date Issued: 2018
- Authors: Diallo, Bakary N'tji
- Date: 2018
- Subjects: Plasmodium 1-deoxy-dxylulose 5-phosphate reductoisomerase , Isoprenoids , Plasmodium , Antimalarials , Malaria -- Chemotherapy , Molecules -- Models , Molecular dynamics , South African Natural Compounds Database
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/64012 , vital:28523
- Description: Malaria remains a major health concern with a complex parasite constantly developing resistance to the different drugs introduced to treat it, threatening the efficacy of the current ACT treatment recommended by WHO (World Health Organization). Different antimalarial compounds with different mechanisms of action are ideal as this decreases chances of resistance occurring. Inhibiting DXR and consequently the MEP pathway is a good strategy to find a new antimalarial with a novel mode of action. From literature, all the enzymes of the MEP pathway have also been shown to be indispensable for the synthesis of isoprenoids. They have been validated as drug targets and the X-ray structure of each of the enzymes has been solved. DXR is a protein which catalyses the second step of the MEP pathway. There are currently 255 DXR inhibitors in the Binding Database (accessed November 2017) generally based on the fosmidomycin structural scaffold and thus often showing poor drug likeness properties. This study aims to research new DXR inhibitors using in silico techniques. We analysed the protein sequence and built 3D models in close and open conformations for the different Plasmodium sequences. Then SANCDB compounds were screened to identify new potential DXR inhibitors with new chemical scaffolds. Finally, the identified hits were submitted to molecular dynamics studies, preceded by a parameterization of the manganese atom in the protein active site.
- Full Text:
- Date Issued: 2018
Influence of knowledge of the end-point on pacing during a 2000m rowing time trial
- Authors: Ferreira, Dean
- Date: 2018
- Subjects: Rowing -- Training , Rowing -- Coaching , Endurance sports -- Training , Rowers -- Ability testing , Rowing -- Training -- Psychological aspects
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/61636 , vital:28044
- Description: Introduction: A typical 2000 m rowing race requires maximal force production over six to eight minutes. Optimal distribution of energetic resources during such a race is vital for optimal performance. There is little research examining the pacing strategies employed by rowers, particularly at the sub-elite level. Aim: The purpose of this investigation was to determine the influence of knowledge of the end-point on pacing during a 2000 m rowing time trial. Methods: Eleven male rowers from a university rowing club volunteered to partake in the study. Each participant completed three experimental trials on an indoor rowing ergometer, each 2000 m. The only difference between the trials was the nature of the information provided beforehand. At the start of the control trial, participants were correctly informed about the distance to be covered. Participants were not informed of the distance to be completed in the unknown trial. For the deceptive trial, participants were told 1000 m would be completed, but when this distance was reached, they were told to continue for another 1000 m. During each trial muscle activity, power output, heart rate, performance time and perceptions of effort were measured.Results: The control trial was significantly (p<0.05) faster than both the unknown and deceptive trials, however the deceptive trial was the fastest of all trials at the 1000 m distance. The unknown trial was slowest at 1000 m and at 2000 m. Muscle activity, RPE, heart rate and power output were significantly (p<0.05) lower in the unknown trial compared to the control and deceptive trial. The control trial exhibited a reverse J-shape pacing profile. The deceptive trial revealed a significant (p<0.05) reduction in performance time, heart rate, power output and muscle activity after the 1000 m interval. The first 500 m interval had the fastest performance and highest power output in all trials. In all trials, RPE was highest at the end of the 2000 m, the greatest reading being obtained at the end of the control trial. During the first 1000 m of the deceptive trial, the dependant variables were similar to those in the control trial. Once the deception was revealed, there was a significant (p<0.05) reduction in the muscle activity, heart rate and power output. Conclusion: The results of this study indicate that accurate end-point information is crucial to the development of an optimal pacing strategy, and ultimately to successful performance. Rowers tend to adopt the reverse J-shape pacing profile most often due to the tactical and physiological benefits offered by this strategy. Unknown or inaccurate end-point information resulted in performance decrements due to the uncertainty associated with the exercise bout.
- Full Text:
- Date Issued: 2018
- Authors: Ferreira, Dean
- Date: 2018
- Subjects: Rowing -- Training , Rowing -- Coaching , Endurance sports -- Training , Rowers -- Ability testing , Rowing -- Training -- Psychological aspects
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/61636 , vital:28044
- Description: Introduction: A typical 2000 m rowing race requires maximal force production over six to eight minutes. Optimal distribution of energetic resources during such a race is vital for optimal performance. There is little research examining the pacing strategies employed by rowers, particularly at the sub-elite level. Aim: The purpose of this investigation was to determine the influence of knowledge of the end-point on pacing during a 2000 m rowing time trial. Methods: Eleven male rowers from a university rowing club volunteered to partake in the study. Each participant completed three experimental trials on an indoor rowing ergometer, each 2000 m. The only difference between the trials was the nature of the information provided beforehand. At the start of the control trial, participants were correctly informed about the distance to be covered. Participants were not informed of the distance to be completed in the unknown trial. For the deceptive trial, participants were told 1000 m would be completed, but when this distance was reached, they were told to continue for another 1000 m. During each trial muscle activity, power output, heart rate, performance time and perceptions of effort were measured.Results: The control trial was significantly (p<0.05) faster than both the unknown and deceptive trials, however the deceptive trial was the fastest of all trials at the 1000 m distance. The unknown trial was slowest at 1000 m and at 2000 m. Muscle activity, RPE, heart rate and power output were significantly (p<0.05) lower in the unknown trial compared to the control and deceptive trial. The control trial exhibited a reverse J-shape pacing profile. The deceptive trial revealed a significant (p<0.05) reduction in performance time, heart rate, power output and muscle activity after the 1000 m interval. The first 500 m interval had the fastest performance and highest power output in all trials. In all trials, RPE was highest at the end of the 2000 m, the greatest reading being obtained at the end of the control trial. During the first 1000 m of the deceptive trial, the dependant variables were similar to those in the control trial. Once the deception was revealed, there was a significant (p<0.05) reduction in the muscle activity, heart rate and power output. Conclusion: The results of this study indicate that accurate end-point information is crucial to the development of an optimal pacing strategy, and ultimately to successful performance. Rowers tend to adopt the reverse J-shape pacing profile most often due to the tactical and physiological benefits offered by this strategy. Unknown or inaccurate end-point information resulted in performance decrements due to the uncertainty associated with the exercise bout.
- Full Text:
- Date Issued: 2018
Interactions between three biological control agents of water hyacinth, Eichhornia crassipes (Mart.) Solms (Pontederiaceae) in South Africa
- Authors: Petela, Nomvume
- Date: 2018
- Subjects: Water hyacinth -- South Africa , Water hyacinth -- Biological control -- South Africa , Aquatic weeds -- Biological control -- South Africa , Curculionidae , Delphacidae , Miridae , Neochetina eichhorniae Warner , Megamelus scutellaris Berg , Eccritotarsus eichhorniae Henry
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/60676 , vital:27814
- Description: Water hyacinth, Eichhomia crassipes (Mart.) Solms (Pontederiaceae) is a free-floating perennial weed that is regarded as the worst aquatic weed in the world because of its negative impacts on aquatic ecosystems. It is native to the Amazon Basin of South America, but since the late 1800s has spread throughout the world. The first record of the weed in South Africa was noted in 1908 on the Cape Flats and in KwaZulu-Natal, but it is now dispersed throughout the country. Mechanical and chemical control methods have been used against the weed, but biological control is considered the most cost-effective, sustainable and environmentally friendly intervention. Currently, nine biological control agents have been released against water hyacinth in South Africa, and Neochetina eichhorniae Warner (Coleoptera: Curculionidae) is used most widely to control it. However, in some sites, water hyacinth mats have still not been brought under control because of eutrophic waters and cool temperatures. It was therefore necessary to release new biological control agents to complement the impact of N. eichhorniae. Megamelus scutellaris Berg (Hemiptera: Delphacidae) was released in 2013, but little is known about how it interacts with other agents already present in South Africa. It is likely to compete with the established biological control agent, Eccritotarsus eichhorniae Henry (Heteroptera: Miridae), because they are both sap suckers. On the other hand, N. eichhorniae is the most widespread and thus the most important biological control agent for water hyacinth. The aim of this study, then, was to determine the interactions between the two sap-sucking agents in South Africa that presumably occupy similar niches on the plant, and the interaction between M. scutellerais and N. eichhorniae, the most widely distributed and abundant agent in South Africa. Three experiments were conducted at the Waainek Research Facility at Rhodes University, Grahamstown, Eastern Cape, South Africa. Plants were grown for two weeks and insect species were inoculated singly or in combination. Water hyacinth, plant growth parameters and insect parameters were measured every 14 days for a period of 12 weeks. The results of the study showed that feeding by either E. eichhorniae or M. scutellaris had no effect on the feeding of the other agent. Both agents reduced all the measured plant growth parameters equally, either singly or in combination (i.e. E. eichhorniae or M. scutellaris alone or together). The interaction between the two agents appears neutral and agents are likely to complement each other in the field. Prior feeding by E. eichhorniae or M. scutellaris on water hyacinth did not affect the subsequent feeding by either agent. Megamelus scutellaris prefers healthy fresh water hyacinth plants. In addition, planthoppers performed best in combination with the weevil, especially on plants with new weevil feeding scars. The results of the study showed that M. scutellaris is compatible with other biological control agents of water hyacinth that are already established in South Africa. Therefore, the introduction of M. scutellaris may enhance the biological control of water hyacinth in South Africa.
- Full Text:
- Date Issued: 2018
- Authors: Petela, Nomvume
- Date: 2018
- Subjects: Water hyacinth -- South Africa , Water hyacinth -- Biological control -- South Africa , Aquatic weeds -- Biological control -- South Africa , Curculionidae , Delphacidae , Miridae , Neochetina eichhorniae Warner , Megamelus scutellaris Berg , Eccritotarsus eichhorniae Henry
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/60676 , vital:27814
- Description: Water hyacinth, Eichhomia crassipes (Mart.) Solms (Pontederiaceae) is a free-floating perennial weed that is regarded as the worst aquatic weed in the world because of its negative impacts on aquatic ecosystems. It is native to the Amazon Basin of South America, but since the late 1800s has spread throughout the world. The first record of the weed in South Africa was noted in 1908 on the Cape Flats and in KwaZulu-Natal, but it is now dispersed throughout the country. Mechanical and chemical control methods have been used against the weed, but biological control is considered the most cost-effective, sustainable and environmentally friendly intervention. Currently, nine biological control agents have been released against water hyacinth in South Africa, and Neochetina eichhorniae Warner (Coleoptera: Curculionidae) is used most widely to control it. However, in some sites, water hyacinth mats have still not been brought under control because of eutrophic waters and cool temperatures. It was therefore necessary to release new biological control agents to complement the impact of N. eichhorniae. Megamelus scutellaris Berg (Hemiptera: Delphacidae) was released in 2013, but little is known about how it interacts with other agents already present in South Africa. It is likely to compete with the established biological control agent, Eccritotarsus eichhorniae Henry (Heteroptera: Miridae), because they are both sap suckers. On the other hand, N. eichhorniae is the most widespread and thus the most important biological control agent for water hyacinth. The aim of this study, then, was to determine the interactions between the two sap-sucking agents in South Africa that presumably occupy similar niches on the plant, and the interaction between M. scutellerais and N. eichhorniae, the most widely distributed and abundant agent in South Africa. Three experiments were conducted at the Waainek Research Facility at Rhodes University, Grahamstown, Eastern Cape, South Africa. Plants were grown for two weeks and insect species were inoculated singly or in combination. Water hyacinth, plant growth parameters and insect parameters were measured every 14 days for a period of 12 weeks. The results of the study showed that feeding by either E. eichhorniae or M. scutellaris had no effect on the feeding of the other agent. Both agents reduced all the measured plant growth parameters equally, either singly or in combination (i.e. E. eichhorniae or M. scutellaris alone or together). The interaction between the two agents appears neutral and agents are likely to complement each other in the field. Prior feeding by E. eichhorniae or M. scutellaris on water hyacinth did not affect the subsequent feeding by either agent. Megamelus scutellaris prefers healthy fresh water hyacinth plants. In addition, planthoppers performed best in combination with the weevil, especially on plants with new weevil feeding scars. The results of the study showed that M. scutellaris is compatible with other biological control agents of water hyacinth that are already established in South Africa. Therefore, the introduction of M. scutellaris may enhance the biological control of water hyacinth in South Africa.
- Full Text:
- Date Issued: 2018
Interrogating teacher leadership development through a formative intervention: a case study in a rural Secondary School in northern Namibia
- Authors: Iyambo, David Kandiwapa
- Date: 2018
- Subjects: Educational leadership -- Namibia , School management and organization -- Namibia , Teachers -- Training of -- Namibia , Cultural Historical Activity Theory
- Language: English
- Type: text , Thesis , Masters , MEd
- Identifier: http://hdl.handle.net/10962/61547 , vital:28035
- Description: The Namibian education system has undergone major policy shifts from a ‘top-down’ hierarchical leadership practice to a more shared and democratic form of leadership in schools. These policies compel principals and school management team members to involve level-one teachers in decision-making and other leadership roles within their schools and beyond. However, to this end, the goals envisaged by policies for teachers to participate in, and contribute to the overall school leadership activities and decision-making have not been fully realised. This was due to the inherent hierarchy of the ‘top-down’ system and autocratic leadership style which remains powerful within the current school practice. Against this backdrop, this study interrogated how teacher leadership can be developed in a rural Secondary School in northern Namibia. The underlying cultural-historical conditions that promoted or constrained teacher leadership development were surfaced. Opportunities for changes in leadership practices through a formative intervention were developed. Cultural Historical Activity Theory (CHAT) was utilised as a theoretical and analytical framework in this study together with Grant’s Model of Teacher Leadership (2006; 2008; 2010). Five level-one teachers, two school management members and a school board chairperson were selected as research participants by means of a purposive sampling method. Furthermore, the study used document analysis, semi-structured interviews, questionnaires and change laboratory workshops as main tools for data generation. The findings revealed that participants understood the concept of teacher leadership differently and that teachers in the case study school were leading in all four zones of teacher leadership model (Grant, 2006; 2008; 2012) although their roles differed. However, the study also found that teacher leadership development was mostly intensified by managerial structures. It appeared from the findings of this study that conditions such as the role of the school management team (SMT) members in promoting teacher leadership development, a supportive organisational culture, and provision of learning support amongst staff members through the attendance of workshops emerged as factors promoting the development of teachers as leaders. The study also revealed that there were many cultural and historical tensions that constrained the practice of teacher leadership development in school. Thus, the study argues that limited leadership training and an inherent ‘top-down’ hierarchical style of leadership was the main underlying systemic causes that constrained teachers to be developed as leaders. Through the change laboratory workshops, the findings suggested that there was a need for continuous professional development initiatives and leadership training, as alternative way for the realisation of teacher leadership development. Finally, a recommendation that leadership aspects should be constituted in pre-and in-service professional development training as an ongoing practice is made.
- Full Text:
- Date Issued: 2018
- Authors: Iyambo, David Kandiwapa
- Date: 2018
- Subjects: Educational leadership -- Namibia , School management and organization -- Namibia , Teachers -- Training of -- Namibia , Cultural Historical Activity Theory
- Language: English
- Type: text , Thesis , Masters , MEd
- Identifier: http://hdl.handle.net/10962/61547 , vital:28035
- Description: The Namibian education system has undergone major policy shifts from a ‘top-down’ hierarchical leadership practice to a more shared and democratic form of leadership in schools. These policies compel principals and school management team members to involve level-one teachers in decision-making and other leadership roles within their schools and beyond. However, to this end, the goals envisaged by policies for teachers to participate in, and contribute to the overall school leadership activities and decision-making have not been fully realised. This was due to the inherent hierarchy of the ‘top-down’ system and autocratic leadership style which remains powerful within the current school practice. Against this backdrop, this study interrogated how teacher leadership can be developed in a rural Secondary School in northern Namibia. The underlying cultural-historical conditions that promoted or constrained teacher leadership development were surfaced. Opportunities for changes in leadership practices through a formative intervention were developed. Cultural Historical Activity Theory (CHAT) was utilised as a theoretical and analytical framework in this study together with Grant’s Model of Teacher Leadership (2006; 2008; 2010). Five level-one teachers, two school management members and a school board chairperson were selected as research participants by means of a purposive sampling method. Furthermore, the study used document analysis, semi-structured interviews, questionnaires and change laboratory workshops as main tools for data generation. The findings revealed that participants understood the concept of teacher leadership differently and that teachers in the case study school were leading in all four zones of teacher leadership model (Grant, 2006; 2008; 2012) although their roles differed. However, the study also found that teacher leadership development was mostly intensified by managerial structures. It appeared from the findings of this study that conditions such as the role of the school management team (SMT) members in promoting teacher leadership development, a supportive organisational culture, and provision of learning support amongst staff members through the attendance of workshops emerged as factors promoting the development of teachers as leaders. The study also revealed that there were many cultural and historical tensions that constrained the practice of teacher leadership development in school. Thus, the study argues that limited leadership training and an inherent ‘top-down’ hierarchical style of leadership was the main underlying systemic causes that constrained teachers to be developed as leaders. Through the change laboratory workshops, the findings suggested that there was a need for continuous professional development initiatives and leadership training, as alternative way for the realisation of teacher leadership development. Finally, a recommendation that leadership aspects should be constituted in pre-and in-service professional development training as an ongoing practice is made.
- Full Text:
- Date Issued: 2018
Investigating Grade 3 learners’ changing mathematical proficiency in a maths club programme focused on number sense progression
- Authors: Hebe, Gasenakeletso Ennie
- Date: 2018
- Subjects: Mathematical ability -- Testing , Education, Elementary -- South Africa , Mathematics -- Study and teaching (Elementary) -- Activity programs , Mathematics -- Remedial teaching , South African Numeracy Chair Project (SANCP)
- Language: English
- Type: text , Thesis , Masters , MEd
- Identifier: http://hdl.handle.net/10962/62200 , vital:28137
- Description: Recent international reports, for example TIMSS (2011 & 2015), point to serious challenges in South African learner performance in Mathematics and Science. Of greatest concern is that research findings (e.g. Graven, Venkat, Westaway and Tshesane 2013) suggest that many South African learners show signs of mathematical knowledge gaps in the lower grades. Hence, there is a need to address challenges of this nature very early in Foundation Phase. This study was undertaken with a view to contribute towards addressing mathematical challenges encountered by learners in Foundation Phase. This empirical enquiry was undertaken under the auspices of the South African Numeracy Chair Project (SANCP) at Rhodes University whose mission is to develop sustainable ways of improving quality teaching and learning of Mathematics in South Africa. A relatively new SANCP programme called Pushing for Progression (PfP) run as part of the after-school Maths Clubs to develop the number sense and four Operations in learners was used to achieve the research aims of this study. Research participants were drawn from the Maths Clubs established by the researcher in a small rural town of Ottosdal in the North West Province of South Africa. This Study is grounded on the Vygotskian perspective and uses the interpretivist qualitative research method for data collection and analysis. Sampling was done opportunistically by enlisting participants (12 teachers and 117 learners) on the basis of their availability and willingness to participate. Pre- and post-assessment of learners’ proficiency on the four Basic Operations was conducted at the beginning and at the end of the research project, respectively. This was done to determine the impact of the project on learner performance. Data analysis was done thematically and through the comparison of learner results of the pre- and post-assessment. The findings point to the effectiveness of the PfP Programme in learner performance. This can be deduced from improved scores between pre- and post-assessment and the observations made by participant-teachers on their respective club learners’ mathematical proficiencies. Accordingly, based on the findings, this study recommends, inter alia, that since the PfP programme is still in its early stages, similar research be conducted elsewhere. Additionally, the Department of Basic Education could consider exploring the PfP programme as one of several other strategies to help improve learner proficiency in Mathematics.
- Full Text:
- Date Issued: 2018
- Authors: Hebe, Gasenakeletso Ennie
- Date: 2018
- Subjects: Mathematical ability -- Testing , Education, Elementary -- South Africa , Mathematics -- Study and teaching (Elementary) -- Activity programs , Mathematics -- Remedial teaching , South African Numeracy Chair Project (SANCP)
- Language: English
- Type: text , Thesis , Masters , MEd
- Identifier: http://hdl.handle.net/10962/62200 , vital:28137
- Description: Recent international reports, for example TIMSS (2011 & 2015), point to serious challenges in South African learner performance in Mathematics and Science. Of greatest concern is that research findings (e.g. Graven, Venkat, Westaway and Tshesane 2013) suggest that many South African learners show signs of mathematical knowledge gaps in the lower grades. Hence, there is a need to address challenges of this nature very early in Foundation Phase. This study was undertaken with a view to contribute towards addressing mathematical challenges encountered by learners in Foundation Phase. This empirical enquiry was undertaken under the auspices of the South African Numeracy Chair Project (SANCP) at Rhodes University whose mission is to develop sustainable ways of improving quality teaching and learning of Mathematics in South Africa. A relatively new SANCP programme called Pushing for Progression (PfP) run as part of the after-school Maths Clubs to develop the number sense and four Operations in learners was used to achieve the research aims of this study. Research participants were drawn from the Maths Clubs established by the researcher in a small rural town of Ottosdal in the North West Province of South Africa. This Study is grounded on the Vygotskian perspective and uses the interpretivist qualitative research method for data collection and analysis. Sampling was done opportunistically by enlisting participants (12 teachers and 117 learners) on the basis of their availability and willingness to participate. Pre- and post-assessment of learners’ proficiency on the four Basic Operations was conducted at the beginning and at the end of the research project, respectively. This was done to determine the impact of the project on learner performance. Data analysis was done thematically and through the comparison of learner results of the pre- and post-assessment. The findings point to the effectiveness of the PfP Programme in learner performance. This can be deduced from improved scores between pre- and post-assessment and the observations made by participant-teachers on their respective club learners’ mathematical proficiencies. Accordingly, based on the findings, this study recommends, inter alia, that since the PfP programme is still in its early stages, similar research be conducted elsewhere. Additionally, the Department of Basic Education could consider exploring the PfP programme as one of several other strategies to help improve learner proficiency in Mathematics.
- Full Text:
- Date Issued: 2018
Investigating the viability and performance of a pilot scale Fly Ash/Lime Filter Tower (FLFT) for greywater treatment and the fate of Triclosan post treatment
- Authors: Nondlazi, Sinoyolo
- Date: 2018
- Subjects: Uncatalogued
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/63704 , vital:28473
- Description: Expected release date-April 2020
- Full Text:
- Date Issued: 2018
- Authors: Nondlazi, Sinoyolo
- Date: 2018
- Subjects: Uncatalogued
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/63704 , vital:28473
- Description: Expected release date-April 2020
- Full Text:
- Date Issued: 2018
Investigating thermal physiology as a tool to improve the release efficacy of insect biological control agents
- Authors: Griffith, Tamzin Camilla
- Date: 2018
- Subjects: Aquatic weeds -- Biological control , Water hyacinth -- Biological control , Insects -- Physiology , Miridae -- Effect of low temperatures on , Cold adaptation , Insects as biological pest control agents , Eccritotarsus catarinensis
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/63301 , vital:28391
- Description: Biological control is commonly used for the control of invasive aquatic weeds, which often involves the release of multiple host-specific agents. Releasing multiple agents has inherent safety concerns as the introduction of each new agent is associated with risks, but is often required to improve control where establishment is limited. Climatic incompatibility between the agent’s thermal physiology and its introduced range often causes agents to fail to establish. However, it has been suggested that the thermal physiology of insects is plastic. Therefore, the potential to manipulate their thermal physiologies before releasing them into the field needs to be explored; reducing the need to release additional agents, thereby ensuring the safety of biological control. This thesis therefore aimed to firstly, determine whether season and locality influenced the thermal physiology of two field populations of a water hyacinth (Eichhornia crassipes) control agent, the mirid Eccritotarsus catarinensis; one collected from the hottest establishment site, and one collected from the coldest establishment site in South Africa. Their thermal physiology was significantly influenced by season and not by the sites’ climate, suggesting their thermal physiology is plastic under field conditions. Secondly, the classical method of determining the lower critical thermal limit (CTmin), and a new respirometry method of determining this limit, compared the thermal physiology of two Eccritotarsus species reared in quarantine. Eccritotarsus catarinensis was significantly more cold tolerant than the more recently released Eccritotarsus eichhorniae, despite similar maintenance conditions, and as such, was used to establish whether cold hardening under laboratory conditions was possible. Successfully cold hardened E. catarinensis had a significantly lower CTmin compared to the field cold acclimated population, suggesting that cold hardening of agents could be conducted before release to improve their cold tolerance and increase their chances of establishment, allowing for further adaptation to colder climates in the field to occur. Increasing establishment of the most effective agents will decrease the number of agents needed in a biological control programme, thus encouraging a more parsimonious approach to biological control.
- Full Text:
- Date Issued: 2018
- Authors: Griffith, Tamzin Camilla
- Date: 2018
- Subjects: Aquatic weeds -- Biological control , Water hyacinth -- Biological control , Insects -- Physiology , Miridae -- Effect of low temperatures on , Cold adaptation , Insects as biological pest control agents , Eccritotarsus catarinensis
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/63301 , vital:28391
- Description: Biological control is commonly used for the control of invasive aquatic weeds, which often involves the release of multiple host-specific agents. Releasing multiple agents has inherent safety concerns as the introduction of each new agent is associated with risks, but is often required to improve control where establishment is limited. Climatic incompatibility between the agent’s thermal physiology and its introduced range often causes agents to fail to establish. However, it has been suggested that the thermal physiology of insects is plastic. Therefore, the potential to manipulate their thermal physiologies before releasing them into the field needs to be explored; reducing the need to release additional agents, thereby ensuring the safety of biological control. This thesis therefore aimed to firstly, determine whether season and locality influenced the thermal physiology of two field populations of a water hyacinth (Eichhornia crassipes) control agent, the mirid Eccritotarsus catarinensis; one collected from the hottest establishment site, and one collected from the coldest establishment site in South Africa. Their thermal physiology was significantly influenced by season and not by the sites’ climate, suggesting their thermal physiology is plastic under field conditions. Secondly, the classical method of determining the lower critical thermal limit (CTmin), and a new respirometry method of determining this limit, compared the thermal physiology of two Eccritotarsus species reared in quarantine. Eccritotarsus catarinensis was significantly more cold tolerant than the more recently released Eccritotarsus eichhorniae, despite similar maintenance conditions, and as such, was used to establish whether cold hardening under laboratory conditions was possible. Successfully cold hardened E. catarinensis had a significantly lower CTmin compared to the field cold acclimated population, suggesting that cold hardening of agents could be conducted before release to improve their cold tolerance and increase their chances of establishment, allowing for further adaptation to colder climates in the field to occur. Increasing establishment of the most effective agents will decrease the number of agents needed in a biological control programme, thus encouraging a more parsimonious approach to biological control.
- Full Text:
- Date Issued: 2018
Isolation, identification and genetic characterisation of a microsporidium isolated from the carob moth, Ectomyelois ceratoniae (Lepidoptera: Pyralidae)
- Authors: Lloyd, Melissa
- Date: 2018
- Subjects: Pyralidae , Pyralidae -- Genetics , Pyralidae -- Phylogeny , Pyralidae -- Pathogens , Cladistic analysis , Transmission electron microscopy , Carob moth (Ectomyelois ceratoniae)
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/61894 , vital:28075
- Description: Carob moth, Ectomyelois ceratoniae (Zeller) (Lepidoptera: Pyralidae) is an economically important pest, yet its biology and pest status on citrus in South Africa was, until recently, poorly understood. A study was initiated to determine the cause of collapse of a laboratory carob moth colony that was established to investigate the biology of carob moth on citrus and to develop integrated management strategies for the pest. An organism was isolated from deceased larvae and was morphologically identified as a microsporidium, based on transmission electron microscopy. Microsporidia are obligate intracellular parasites that have been found to infect almost all eukaryotes. Several Nosema species have been isolated from economically important insect pests, yet little genetic information is available from online databases for identification. Mature spores were recovered and measured using transmission electron microscopy. Spores were ovocylindrical with a wrinkled exospore, and had a length of 2.8 ± 0.02 pm and a width of 1.6 ± 0.04 pm. The identity of the microsporidium was confirmed by PCR amplification, sequencing and analysis of the regions encoding the ribosomal RNA. BLAST analysis of the different rRNA regions amplified showed that the microsporidium shared a 96 - 99 % identity with Nosema sp. M-Pr, Nosema carpocapsae, Nosema oulemae, Nosema sp. CO1, Microsporidium 57864, and Nosema bombi. Phylogenetic analysis of the SSU and LSU rRNA genes showed that the microsporidium clustered with the Nosema / Vairimorpha clade, supported by a bootstrap value of 100. The organisation of the RNA cistron was determined by PCR amplification using the primer set 18f and L1328r to be 5’-SSU-ITS-LSU-IGS-5S-3’, which confirms the placement of the microsporidium within the Nosema / Vairimorpha clade. Because the BLAST results showed a close relationship with Nosema carpocapsae, a microsporidium infecting codling moth, the pathogenicity of the microsporidium was tested against codling moth by inoculating artificial diet with a high spore concentration of 1.1 x 107 spores/ml and a low spore concentration of 1.1 x 104 spores/ml. DNA was extracted from deceased larvae inoculated with the high concentration, and PCR of the SSU rRNA gene and bacterial 16S region was performed. Mortality in the high concentration experiment was significant (p = 0.05), but the cause of infection was determined to be a bacterium, through sequencing and BLAST analysis of the bacterial 16S rDNA. The bacterium shared a 99 % identity with Bacillus cereus. Percentage mortality (p = 0.09), larval mass (p = 0.09) and instar (p = 0.24) did not differ significantly between treatments in the low concentration experiment. DNA was extracted from the larvae and PCR amplification of the SSU rRNA gene was performed to determine whether microsporidia were present. No SSU bands were observed in any of the treatments and percentage mortality was not significant, thus it was determined that no infection occurred. This is the first study to report the genetic characterisation of a microsporidium isolated from carob moth and provides important genetic information for classification of microsporidia within the Nosema / Vairimorpha clade. It is also one of few studies in which the complete rRNA cistron of a species within the Nosema / Vairimorpha clade has been sequenced. The identification of a microsporidium from a laboratory colony of carob moth is important as it provides information about pathogens infecting the carob moth and constraints to carob moth rearing, which is useful for further studies on rearing carob moth and for establishment of a clean colony for research purposes.
- Full Text:
- Date Issued: 2018
- Authors: Lloyd, Melissa
- Date: 2018
- Subjects: Pyralidae , Pyralidae -- Genetics , Pyralidae -- Phylogeny , Pyralidae -- Pathogens , Cladistic analysis , Transmission electron microscopy , Carob moth (Ectomyelois ceratoniae)
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/61894 , vital:28075
- Description: Carob moth, Ectomyelois ceratoniae (Zeller) (Lepidoptera: Pyralidae) is an economically important pest, yet its biology and pest status on citrus in South Africa was, until recently, poorly understood. A study was initiated to determine the cause of collapse of a laboratory carob moth colony that was established to investigate the biology of carob moth on citrus and to develop integrated management strategies for the pest. An organism was isolated from deceased larvae and was morphologically identified as a microsporidium, based on transmission electron microscopy. Microsporidia are obligate intracellular parasites that have been found to infect almost all eukaryotes. Several Nosema species have been isolated from economically important insect pests, yet little genetic information is available from online databases for identification. Mature spores were recovered and measured using transmission electron microscopy. Spores were ovocylindrical with a wrinkled exospore, and had a length of 2.8 ± 0.02 pm and a width of 1.6 ± 0.04 pm. The identity of the microsporidium was confirmed by PCR amplification, sequencing and analysis of the regions encoding the ribosomal RNA. BLAST analysis of the different rRNA regions amplified showed that the microsporidium shared a 96 - 99 % identity with Nosema sp. M-Pr, Nosema carpocapsae, Nosema oulemae, Nosema sp. CO1, Microsporidium 57864, and Nosema bombi. Phylogenetic analysis of the SSU and LSU rRNA genes showed that the microsporidium clustered with the Nosema / Vairimorpha clade, supported by a bootstrap value of 100. The organisation of the RNA cistron was determined by PCR amplification using the primer set 18f and L1328r to be 5’-SSU-ITS-LSU-IGS-5S-3’, which confirms the placement of the microsporidium within the Nosema / Vairimorpha clade. Because the BLAST results showed a close relationship with Nosema carpocapsae, a microsporidium infecting codling moth, the pathogenicity of the microsporidium was tested against codling moth by inoculating artificial diet with a high spore concentration of 1.1 x 107 spores/ml and a low spore concentration of 1.1 x 104 spores/ml. DNA was extracted from deceased larvae inoculated with the high concentration, and PCR of the SSU rRNA gene and bacterial 16S region was performed. Mortality in the high concentration experiment was significant (p = 0.05), but the cause of infection was determined to be a bacterium, through sequencing and BLAST analysis of the bacterial 16S rDNA. The bacterium shared a 99 % identity with Bacillus cereus. Percentage mortality (p = 0.09), larval mass (p = 0.09) and instar (p = 0.24) did not differ significantly between treatments in the low concentration experiment. DNA was extracted from the larvae and PCR amplification of the SSU rRNA gene was performed to determine whether microsporidia were present. No SSU bands were observed in any of the treatments and percentage mortality was not significant, thus it was determined that no infection occurred. This is the first study to report the genetic characterisation of a microsporidium isolated from carob moth and provides important genetic information for classification of microsporidia within the Nosema / Vairimorpha clade. It is also one of few studies in which the complete rRNA cistron of a species within the Nosema / Vairimorpha clade has been sequenced. The identification of a microsporidium from a laboratory colony of carob moth is important as it provides information about pathogens infecting the carob moth and constraints to carob moth rearing, which is useful for further studies on rearing carob moth and for establishment of a clean colony for research purposes.
- Full Text:
- Date Issued: 2018
Judging psycholegal reporting in civil court proceedings in the Eastern Cape
- Authors: Marais, Claire Anne
- Date: 2018
- Subjects: Court proceedings -- South Africa -- Eastern Cape , Evidence, Expert -- South Africa -- Eastern Cape , Forensic psychology -- South Africa -- Eastern Cape , Quality Rating Scale (QRS) , Psycholegal reporting -- South Africa -- Eastern Cape
- Language: English
- Type: text , Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/62999 , vital:28352
- Description: Purpose: The primary purpose for this research was to evaluate the quality of psycholegal reports, and the qualification of the authors. Previous research had revealed generalised poor practices in psycholegal report writing and the authors seemed unqualified as expert witness. This negatively influenced the impression and usefulness of expert psychological opinion in South African courts. The secondary purpose was to compare the results to those determined by Ireland (2012), which was a useful benchmark study in the UK as her findings corresponded with the literature. Method: This archival research analysed a hand-search sample of 20 reports written by 20 psychologists based nationally. These reports were submitted as expert opinion in civil proceedings in the Grahamstown Division of the Eastern Cape High Court between 2011 and 2016. Ireland and Pinschof’s (2009) measure ‘Quality Rating Scale’ was adapted for a South African context and used to evaluate quantitatively the reports. Focus was on the reports’ contents (fact and opinion), methods, process and overall rating, and the qualification of the authors. Results: Overall, two-thirds of the reports were rated as ‘good’ and ‘very good’. The results were generally more positive than Ireland’s (2012) findings. However, there were practices in the report writing that were deemed detrimental to the quality of the expert’s opinion. This included vague referral questions and unclear basis for concluding opinions and diagnosis. There was also a lack of discussions surrounding the scientific trustworthiness of testing methods and absent ethical considerations. Lastly, the specialised expertise of the experts was not adequately documented. Conclusion: The findings painted a more positive picture of psycholegal reporting in South Africa than illustrated in previous research, which seemingly relied on anecdotes and subjective surveys. This study used a systematic and objective measure. The findings of this study, previous research and ethical Rules of Conduct were used to consider recommendations for psycholegal report writing, and the improvement of the field of psycholegal work. Lastly, the focus of future research was discussed.
- Full Text:
- Date Issued: 2018
- Authors: Marais, Claire Anne
- Date: 2018
- Subjects: Court proceedings -- South Africa -- Eastern Cape , Evidence, Expert -- South Africa -- Eastern Cape , Forensic psychology -- South Africa -- Eastern Cape , Quality Rating Scale (QRS) , Psycholegal reporting -- South Africa -- Eastern Cape
- Language: English
- Type: text , Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/62999 , vital:28352
- Description: Purpose: The primary purpose for this research was to evaluate the quality of psycholegal reports, and the qualification of the authors. Previous research had revealed generalised poor practices in psycholegal report writing and the authors seemed unqualified as expert witness. This negatively influenced the impression and usefulness of expert psychological opinion in South African courts. The secondary purpose was to compare the results to those determined by Ireland (2012), which was a useful benchmark study in the UK as her findings corresponded with the literature. Method: This archival research analysed a hand-search sample of 20 reports written by 20 psychologists based nationally. These reports were submitted as expert opinion in civil proceedings in the Grahamstown Division of the Eastern Cape High Court between 2011 and 2016. Ireland and Pinschof’s (2009) measure ‘Quality Rating Scale’ was adapted for a South African context and used to evaluate quantitatively the reports. Focus was on the reports’ contents (fact and opinion), methods, process and overall rating, and the qualification of the authors. Results: Overall, two-thirds of the reports were rated as ‘good’ and ‘very good’. The results were generally more positive than Ireland’s (2012) findings. However, there were practices in the report writing that were deemed detrimental to the quality of the expert’s opinion. This included vague referral questions and unclear basis for concluding opinions and diagnosis. There was also a lack of discussions surrounding the scientific trustworthiness of testing methods and absent ethical considerations. Lastly, the specialised expertise of the experts was not adequately documented. Conclusion: The findings painted a more positive picture of psycholegal reporting in South Africa than illustrated in previous research, which seemingly relied on anecdotes and subjective surveys. This study used a systematic and objective measure. The findings of this study, previous research and ethical Rules of Conduct were used to consider recommendations for psycholegal report writing, and the improvement of the field of psycholegal work. Lastly, the focus of future research was discussed.
- Full Text:
- Date Issued: 2018
Leadership development within a Learner Representative Council (LRC) in a rural secondary school in the Oshana region, Namibia
- Authors: Da Silva, Rolens
- Date: 2018
- Subjects: Student participation in administration Namibia , Student government Namibia , Educational leadership Namibia , Qualitative research
- Language: English
- Type: text , Thesis , Masters , MEd
- Identifier: http://hdl.handle.net/10962/62808 , vital:28282
- Description: The Namibian Education Act (Namibia. Education Act No. 16 of 2001) mandates state secondary school learners to be included in school leadership through a body of learners known as the Learner Representative Council (LRC). The few studies carried out on the LRC in schools reveal that very little has been achieved in terms of learner leadership development. This study explored and provided insight into possible reasons for this, and recommendations. The research questions driving the study were: How is learner leadership currently understood and practised in the school? What are the enabling and constraining factors in the school as far as learner leadership development is concerned? And what can be done to promote learner leadership development? This study is an interpretive case study of learner leadership in the LRC in a Namibian state secondary school in the Oshana region. The conceptual framework used was distributed leadership. The Cultural Historical Activity Theory (CHAT) was used as an analytical tool. The research participants were the LRC members, school principal, Heads of Departments representing the school management members, the School Board Chairperson representing parents and the LRC liaison teacher and were all purposively selected. Data was collected through document analysis, open-ended questionnaires, interviews and non-participant observation. Data analysis took the form of inductively – identifying themes emerged from the data and deductively – using CHAT to surface the systemic contradictions within the learners’ activity system. The data revealed that learner leadership was mostly understood from a management perspective and equated with the formal authority of the LRC in the school. The data further revealed that the LRC performed more leadership roles stretched from inside the classroom, outside the classroom, on the School Board and outside the school. To capture this complexity, I developed a model which may prove useful for future studies of learner leadership. The data also indicated that much support was offered to the LRC members in the school; for example, support from the LRC liaison teacher, the School Management Team and generally from the school, through LRC leadership training. Using CHAT, the findings revealed that the historical context and cultural conventions contradicted the LRC leadership development in the school. In line with a distributed leadership theory, the study recommends that learner leadership should not be limited by position and authority but should be exercised by all learners, through the development and establishment of learner leader clubs in the school. The study also recommends that schools should embark on change initiatives which challenge their traditionally held beliefs and attitudes.
- Full Text:
- Date Issued: 2018
- Authors: Da Silva, Rolens
- Date: 2018
- Subjects: Student participation in administration Namibia , Student government Namibia , Educational leadership Namibia , Qualitative research
- Language: English
- Type: text , Thesis , Masters , MEd
- Identifier: http://hdl.handle.net/10962/62808 , vital:28282
- Description: The Namibian Education Act (Namibia. Education Act No. 16 of 2001) mandates state secondary school learners to be included in school leadership through a body of learners known as the Learner Representative Council (LRC). The few studies carried out on the LRC in schools reveal that very little has been achieved in terms of learner leadership development. This study explored and provided insight into possible reasons for this, and recommendations. The research questions driving the study were: How is learner leadership currently understood and practised in the school? What are the enabling and constraining factors in the school as far as learner leadership development is concerned? And what can be done to promote learner leadership development? This study is an interpretive case study of learner leadership in the LRC in a Namibian state secondary school in the Oshana region. The conceptual framework used was distributed leadership. The Cultural Historical Activity Theory (CHAT) was used as an analytical tool. The research participants were the LRC members, school principal, Heads of Departments representing the school management members, the School Board Chairperson representing parents and the LRC liaison teacher and were all purposively selected. Data was collected through document analysis, open-ended questionnaires, interviews and non-participant observation. Data analysis took the form of inductively – identifying themes emerged from the data and deductively – using CHAT to surface the systemic contradictions within the learners’ activity system. The data revealed that learner leadership was mostly understood from a management perspective and equated with the formal authority of the LRC in the school. The data further revealed that the LRC performed more leadership roles stretched from inside the classroom, outside the classroom, on the School Board and outside the school. To capture this complexity, I developed a model which may prove useful for future studies of learner leadership. The data also indicated that much support was offered to the LRC members in the school; for example, support from the LRC liaison teacher, the School Management Team and generally from the school, through LRC leadership training. Using CHAT, the findings revealed that the historical context and cultural conventions contradicted the LRC leadership development in the school. In line with a distributed leadership theory, the study recommends that learner leadership should not be limited by position and authority but should be exercised by all learners, through the development and establishment of learner leader clubs in the school. The study also recommends that schools should embark on change initiatives which challenge their traditionally held beliefs and attitudes.
- Full Text:
- Date Issued: 2018
Leadership development within a learner representative council: a Namibian primary school case study
- Authors: Tjihuro, Jaqueline
- Date: 2018
- Subjects: School management and organization Namibia , Educational leadership Namibia , Student participation in administration Namibia , Student government Namibia
- Language: English
- Type: text , Thesis , Masters , MEd
- Identifier: http://hdl.handle.net/10962/61558 , vital:28036
- Description: Learners in Namibian primary schools are seemingly not brave enough to stand and raise their voice on issues that concern them. This is what Shekupakela-Nelulu (2008) wrote after a study she conducted on the Learners’ Representative Council (LRC) of a school in Namibia. She refers to a time when “the involvement of students in school affairs was seen by the regime as a political act and attempts by student leaders to involve themselves in educational issues were often quashed” (ibid., p. i). This situation will be all too familiar to South African readers, where a public holiday, Youth Day, was declared to mark the apartheid regime’s brutal treatment of learner protestors on June 16, 1976. While Namibia has not experienced events of such magnitude, the notion of learner voice is equally problematic and worthy of investigation. The absence of leadership development opportunities for learners has led to this research study which seeks to answer the central research question: How can learner leadership be developed in a LRC? I used an interpretive paradigm, adopting a qualitative approach in the study. Concurrently, the study was framed and guided by the second generation of Cultural Historical Activity Theory (CHAT) as an analytical tool to achieve my research goal. The following questions guided the study in two phases. Phase one: What were the perceived causes for the nonsustainability of the learner leadership (LL) club at the school? Phase two: How is the notion of learner leadership understood in the school? How is leadership developed on the LRC? What enables and constrains leadership development of learners on the LRC? The research participants were thirty LRC members from grades 6 and 7 and15 teachers who teach the LRC members. The principal and three HOD’s were also research participants being part of the Senior Management team. One of the HOD’s also fulfils the role of the guardian teacher to the LRC. A school board chairperson also participated in the Change Laboratory Workshop. Data was generated through multiple data sources such as questionnaires, individual interviews, a focus group interview and observation. The findings from phase one of the study revealed that the learner leadership club’s intervention was a success during the 2014 academic year, but the absence of the learner leadership club as an extra-mural activity affected the sustainability of the club into the next academic year 2015. Findings from phase two revealed that leadership opportunities did exist at the school for learner leadership development. However, a few challenges emerged relating to traditional views of leadership and constraining factors that could affect learner leadership development at the school. Thus, Change Laboratory workshops were held to find solutions to the challenges, in order to promote and enhance learner leadership development, hopefully for the future of the Namibian child.
- Full Text:
- Date Issued: 2018
Leadership development within a learner representative council: a Namibian primary school case study
- Authors: Tjihuro, Jaqueline
- Date: 2018
- Subjects: School management and organization Namibia , Educational leadership Namibia , Student participation in administration Namibia , Student government Namibia
- Language: English
- Type: text , Thesis , Masters , MEd
- Identifier: http://hdl.handle.net/10962/61558 , vital:28036
- Description: Learners in Namibian primary schools are seemingly not brave enough to stand and raise their voice on issues that concern them. This is what Shekupakela-Nelulu (2008) wrote after a study she conducted on the Learners’ Representative Council (LRC) of a school in Namibia. She refers to a time when “the involvement of students in school affairs was seen by the regime as a political act and attempts by student leaders to involve themselves in educational issues were often quashed” (ibid., p. i). This situation will be all too familiar to South African readers, where a public holiday, Youth Day, was declared to mark the apartheid regime’s brutal treatment of learner protestors on June 16, 1976. While Namibia has not experienced events of such magnitude, the notion of learner voice is equally problematic and worthy of investigation. The absence of leadership development opportunities for learners has led to this research study which seeks to answer the central research question: How can learner leadership be developed in a LRC? I used an interpretive paradigm, adopting a qualitative approach in the study. Concurrently, the study was framed and guided by the second generation of Cultural Historical Activity Theory (CHAT) as an analytical tool to achieve my research goal. The following questions guided the study in two phases. Phase one: What were the perceived causes for the nonsustainability of the learner leadership (LL) club at the school? Phase two: How is the notion of learner leadership understood in the school? How is leadership developed on the LRC? What enables and constrains leadership development of learners on the LRC? The research participants were thirty LRC members from grades 6 and 7 and15 teachers who teach the LRC members. The principal and three HOD’s were also research participants being part of the Senior Management team. One of the HOD’s also fulfils the role of the guardian teacher to the LRC. A school board chairperson also participated in the Change Laboratory Workshop. Data was generated through multiple data sources such as questionnaires, individual interviews, a focus group interview and observation. The findings from phase one of the study revealed that the learner leadership club’s intervention was a success during the 2014 academic year, but the absence of the learner leadership club as an extra-mural activity affected the sustainability of the club into the next academic year 2015. Findings from phase two revealed that leadership opportunities did exist at the school for learner leadership development. However, a few challenges emerged relating to traditional views of leadership and constraining factors that could affect learner leadership development at the school. Thus, Change Laboratory workshops were held to find solutions to the challenges, in order to promote and enhance learner leadership development, hopefully for the future of the Namibian child.
- Full Text:
- Date Issued: 2018
Learner voice and leadership: a study of a Learner Representative Council in a primary school in Namibia
- Authors: Kapuire, Dominika Bertha
- Date: 2018
- Subjects: Educational leadership -- Namibia , School management and organization -- Namibia , Student government -- Namibia , Student participation in administration -- Namibia , Education, Primary -- Namibia , Cultural Historical Activity Theory
- Language: English
- Type: text , Thesis , Masters , MEd
- Identifier: http://hdl.handle.net/10962/62177 , vital:28135
- Description: Numerous literature world-wide emphasises the significance of learner voice and leadership in schools. These concerns are not new to the education system of Namibia, because the education system is shaped by policy which encourages the voices of all stakeholders in the schools. The Education Act 16 of 2001 introduced the Learner Representative Council (LRC) as a legitimised body in secondary schools which represents learners in school level decision-making. Learner Representative Council members in secondary schools are allowed to sit in on School Board meetings and voice their concerns about issues at the school. The Act also involved parents, allowing them to air their views on behalf of their children, by becoming part of the School Board. Although this is what the Act 16 of 2001 introduced, recent researchers have urged for the need to develop learner voice and leadership in schools, as many schools have turned a blind eye to its significance. This is also what prompted me to conduct a study on the development of learner voice and leadership. This research was conducted within the context of learner leadership at a primary school in the Otjozondjupa region, Namibia, focusing on the school’s existing Learner Representative Council (LRC). The study explores the underlying reasons for the current problems in the LRC structure and beyond, opening up leadership opportunities, and promoting learner voice at the school. Participants in the research were drawn from learners, teachers, heads of department, and the principal. As a qualitative case study in the interpretive paradigm, the study employed a range of data collection strategies - questionnaires, interviews, focus group interviews, observation and Change Laboratory (CL) workshops - to gather data to answer key research questions: How is the LRC currently involved in the leadership of the school? What are the factors inhibiting the development of learner leadership in the school? What opportunities exist for the development of learner voice and leadership within the LRC? How can learner voice and leadership be developed through Change Laboratory (CL) workshops? The research was underpinned by the second generation of Cultural-Historical Activity Theory (CHAT) as an analytical framework. CHAT had the potential to bring problems and challenges into focus, which was then used to open up expansive learning in the CL workshops. Data collected from the participants was surfaced as mirror data in these workshops. The study showed that the LRC was not active in their leadership roles and that they were not given enough opportunities to function freely in their roles. These learners were under a traditional system of leadership, whereby teachers had all the control and say in the learners’ leadership roles. The development of learner leadership was only recognised through the leadership training camp. Many factors that inhibited the development of learner voice and leadership also emerged in the study. Lastly, the notion of developing learner voice was also not understood by some teachers, which showed in their contradicting views. This study recommends that learner leadership should be developed, starting at an early age in the primary school. It also recommends that learners, however young, should be given a platform to contribute to the decision making at their schools.
- Full Text:
- Date Issued: 2018
- Authors: Kapuire, Dominika Bertha
- Date: 2018
- Subjects: Educational leadership -- Namibia , School management and organization -- Namibia , Student government -- Namibia , Student participation in administration -- Namibia , Education, Primary -- Namibia , Cultural Historical Activity Theory
- Language: English
- Type: text , Thesis , Masters , MEd
- Identifier: http://hdl.handle.net/10962/62177 , vital:28135
- Description: Numerous literature world-wide emphasises the significance of learner voice and leadership in schools. These concerns are not new to the education system of Namibia, because the education system is shaped by policy which encourages the voices of all stakeholders in the schools. The Education Act 16 of 2001 introduced the Learner Representative Council (LRC) as a legitimised body in secondary schools which represents learners in school level decision-making. Learner Representative Council members in secondary schools are allowed to sit in on School Board meetings and voice their concerns about issues at the school. The Act also involved parents, allowing them to air their views on behalf of their children, by becoming part of the School Board. Although this is what the Act 16 of 2001 introduced, recent researchers have urged for the need to develop learner voice and leadership in schools, as many schools have turned a blind eye to its significance. This is also what prompted me to conduct a study on the development of learner voice and leadership. This research was conducted within the context of learner leadership at a primary school in the Otjozondjupa region, Namibia, focusing on the school’s existing Learner Representative Council (LRC). The study explores the underlying reasons for the current problems in the LRC structure and beyond, opening up leadership opportunities, and promoting learner voice at the school. Participants in the research were drawn from learners, teachers, heads of department, and the principal. As a qualitative case study in the interpretive paradigm, the study employed a range of data collection strategies - questionnaires, interviews, focus group interviews, observation and Change Laboratory (CL) workshops - to gather data to answer key research questions: How is the LRC currently involved in the leadership of the school? What are the factors inhibiting the development of learner leadership in the school? What opportunities exist for the development of learner voice and leadership within the LRC? How can learner voice and leadership be developed through Change Laboratory (CL) workshops? The research was underpinned by the second generation of Cultural-Historical Activity Theory (CHAT) as an analytical framework. CHAT had the potential to bring problems and challenges into focus, which was then used to open up expansive learning in the CL workshops. Data collected from the participants was surfaced as mirror data in these workshops. The study showed that the LRC was not active in their leadership roles and that they were not given enough opportunities to function freely in their roles. These learners were under a traditional system of leadership, whereby teachers had all the control and say in the learners’ leadership roles. The development of learner leadership was only recognised through the leadership training camp. Many factors that inhibited the development of learner voice and leadership also emerged in the study. Lastly, the notion of developing learner voice was also not understood by some teachers, which showed in their contradicting views. This study recommends that learner leadership should be developed, starting at an early age in the primary school. It also recommends that learners, however young, should be given a platform to contribute to the decision making at their schools.
- Full Text:
- Date Issued: 2018
Macroinvertebrate and diatom assemblage responses to pollution, with emphasis on salinity, in the Kat River, Eastern Cape South Africa
- Authors: Mgaba, Ntombekhaya
- Date: 2018
- Subjects: Water -- Pollution -- South Africa -- Kat River , Stream salinity -- South Africa -- Kat River , Sewage disposal plants -- South Africa , Environmental monitoring -- South Africa -- Kat River , Water quality -- South Africa -- Kat River , South African Scoring System version 5 (SASS5) , Macroinvertebrate Response Assessment Index (MIRAI)
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/63279 , vital:28389
- Description: Salinity has been implicated as one of the major contributors to deteriorating water quality of freshwater ecosystems around the globe. In South Africa, anthropogenic activities such as mining, agriculture, industry and wastewater treatment works (WWTWs) are the major sources of increasing salinity levels of freshwater resources. The main focus of this study was to assess the impact of salinity on water quality of the Kat River using macroinvertebrates and diatoms as bioindicators. Biomonitoring using macroinvertebrates and diatom communities and concurrent sampling of water physicochemical variables were conducted bi-monthly from December 2015 to November 2016.This period covered summer and winter, and the study was conducted at five selected sites (Sites 1, 2, 3, 4 and 5) along the length of the Kat River. For macroinvertebrates biomonitoring, the South African Scoring System version 5 (SASS5) and Macroinvertebrate Response Assessment Index (MIRAI) were applied to collect and analyse data, while the Taylor et al (2006) protocol for collecting and analysing diatom assemblages was modified and used for diatom collection and analysis. Water physicochemical variables, including hydrogen ion concentration (pH), electrical conductivity (EC), dissolved oxygen (DO), temperature, turbidity and stream flow were determined in situ using appropriate multiprobe meter and/or techniques. Nutrients (NO3-N, NO2-N, NH4-N and PO4-P) were analysed in the laboratory using appropriate analytical methods. All data were subjected to appropriate statistical analyses and statistical decisions were made at an alpha value of 0.05. Particularly, multivariate analyses of both macroinvertebrates and diatoms assemblages were conducted using canonical correspondence analysis and Bray-Curtis similarity analysis, while indicator species analysis was used to determine which species is/are more significant with respect to biomonitoring in the Kat River. Biotic diversity indices were also measured and used to discriminate between least and most impacted sites. The Kat River water quality was found to have experienced a varying degree of modification compared to Generic Resources Water Quality Objectives limits. Change in DO, stream flow, EC, nutrients and turbidity exerted the greatest influenced on the macroinvertebrates assemblage structure, with organisms at Sites 4 and 5 (downstream sites) showing more significant negative impact compared to organisms at Sites 1, 2 and 3 (upstream sites). Analysis of the diatom biomonitoring showed more negative impact at Sites 2, 4 and 5 compared to Sites 1 and 3. Fort Beaufort Wastewater Treatment Works and small-scale farming activities, as well as leaking of pipes carrying sewage, were found to be the likely major sources of anthropogenic activities responsible for the observed increased salinity and other pollutants in the Kat River. Overall, this study found macroinvertebrates (identified up to the family level) as good for biomonitoring to assess or predict water quality of the Kat River, while diatoms were found to be most suitable for biomonitoring to assess salinity in the Kat River.
- Full Text:
- Date Issued: 2018
- Authors: Mgaba, Ntombekhaya
- Date: 2018
- Subjects: Water -- Pollution -- South Africa -- Kat River , Stream salinity -- South Africa -- Kat River , Sewage disposal plants -- South Africa , Environmental monitoring -- South Africa -- Kat River , Water quality -- South Africa -- Kat River , South African Scoring System version 5 (SASS5) , Macroinvertebrate Response Assessment Index (MIRAI)
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/63279 , vital:28389
- Description: Salinity has been implicated as one of the major contributors to deteriorating water quality of freshwater ecosystems around the globe. In South Africa, anthropogenic activities such as mining, agriculture, industry and wastewater treatment works (WWTWs) are the major sources of increasing salinity levels of freshwater resources. The main focus of this study was to assess the impact of salinity on water quality of the Kat River using macroinvertebrates and diatoms as bioindicators. Biomonitoring using macroinvertebrates and diatom communities and concurrent sampling of water physicochemical variables were conducted bi-monthly from December 2015 to November 2016.This period covered summer and winter, and the study was conducted at five selected sites (Sites 1, 2, 3, 4 and 5) along the length of the Kat River. For macroinvertebrates biomonitoring, the South African Scoring System version 5 (SASS5) and Macroinvertebrate Response Assessment Index (MIRAI) were applied to collect and analyse data, while the Taylor et al (2006) protocol for collecting and analysing diatom assemblages was modified and used for diatom collection and analysis. Water physicochemical variables, including hydrogen ion concentration (pH), electrical conductivity (EC), dissolved oxygen (DO), temperature, turbidity and stream flow were determined in situ using appropriate multiprobe meter and/or techniques. Nutrients (NO3-N, NO2-N, NH4-N and PO4-P) were analysed in the laboratory using appropriate analytical methods. All data were subjected to appropriate statistical analyses and statistical decisions were made at an alpha value of 0.05. Particularly, multivariate analyses of both macroinvertebrates and diatoms assemblages were conducted using canonical correspondence analysis and Bray-Curtis similarity analysis, while indicator species analysis was used to determine which species is/are more significant with respect to biomonitoring in the Kat River. Biotic diversity indices were also measured and used to discriminate between least and most impacted sites. The Kat River water quality was found to have experienced a varying degree of modification compared to Generic Resources Water Quality Objectives limits. Change in DO, stream flow, EC, nutrients and turbidity exerted the greatest influenced on the macroinvertebrates assemblage structure, with organisms at Sites 4 and 5 (downstream sites) showing more significant negative impact compared to organisms at Sites 1, 2 and 3 (upstream sites). Analysis of the diatom biomonitoring showed more negative impact at Sites 2, 4 and 5 compared to Sites 1 and 3. Fort Beaufort Wastewater Treatment Works and small-scale farming activities, as well as leaking of pipes carrying sewage, were found to be the likely major sources of anthropogenic activities responsible for the observed increased salinity and other pollutants in the Kat River. Overall, this study found macroinvertebrates (identified up to the family level) as good for biomonitoring to assess or predict water quality of the Kat River, while diatoms were found to be most suitable for biomonitoring to assess salinity in the Kat River.
- Full Text:
- Date Issued: 2018