The impact of the broadcast legislative reforms on the newsroom staff's perceptions of the Zambia National Broadcasting Corporation (ZNBC)'s editorial operations and news content
- Authors: Hamasaka, Clayson
- Date: 2008
- Subjects: Zambia National Broadcasting Corporation Public broadcasting -- Zambia Mass media -- Management -- Zambia Broadcasting -- Law and legislation -- Zambia Broadcasting -- Political aspects -- Zambia
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3432 , http://hdl.handle.net/10962/d1002886
- Description: The 1980s and 1990s saw major changes in the political landscape of the media in many countries that were either reverting or emerging from repressive nondemocratic regimes. Among the notable changes in media industry was the opening up of the national airwaves, which had been a state monopoly, to private sector and community participation. The democratic dispensation also put state broadcasters in the spot-light regarding their editorial content which was previously ‘institutionalised’ as belonging to the ruling regimes. This study set out to investigate the extent to which broadcasting reform legislation meant to address the unfair coverage of contending voices on Zambia’s public broadcaster has had an impact in reversing the situation in the newsroom. Using qualitative methods of investigation, the study established that while the ZNBC staff understand aspects of their role in their newsroom in relation to the principles of public service broadcasting and in line with the enacted legislation, they perceive that, in practice, they have to ensure that the news content still remains a reserve of a few voices in favour of the ruling regime. This was evidenced by testimonies from the news staff’s complaints of continued editorial interference in their work by government leaders and government appointed gatekeepers, as well as selfcensorship. The study recommends, among other things, the full implementation of the recently enacted laws on the operations of ZNBC in order to achieve some minimum levels of being a public broadcaster. It further recommends a serious re-orientation of the ZNBC newsroom and management staff to the current legislative requirements so as to shift their mindset away from their traditionally-held views of thinking that news at that station is only for the ruling regime.
- Full Text:
- Date Issued: 2008
- Authors: Hamasaka, Clayson
- Date: 2008
- Subjects: Zambia National Broadcasting Corporation Public broadcasting -- Zambia Mass media -- Management -- Zambia Broadcasting -- Law and legislation -- Zambia Broadcasting -- Political aspects -- Zambia
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3432 , http://hdl.handle.net/10962/d1002886
- Description: The 1980s and 1990s saw major changes in the political landscape of the media in many countries that were either reverting or emerging from repressive nondemocratic regimes. Among the notable changes in media industry was the opening up of the national airwaves, which had been a state monopoly, to private sector and community participation. The democratic dispensation also put state broadcasters in the spot-light regarding their editorial content which was previously ‘institutionalised’ as belonging to the ruling regimes. This study set out to investigate the extent to which broadcasting reform legislation meant to address the unfair coverage of contending voices on Zambia’s public broadcaster has had an impact in reversing the situation in the newsroom. Using qualitative methods of investigation, the study established that while the ZNBC staff understand aspects of their role in their newsroom in relation to the principles of public service broadcasting and in line with the enacted legislation, they perceive that, in practice, they have to ensure that the news content still remains a reserve of a few voices in favour of the ruling regime. This was evidenced by testimonies from the news staff’s complaints of continued editorial interference in their work by government leaders and government appointed gatekeepers, as well as selfcensorship. The study recommends, among other things, the full implementation of the recently enacted laws on the operations of ZNBC in order to achieve some minimum levels of being a public broadcaster. It further recommends a serious re-orientation of the ZNBC newsroom and management staff to the current legislative requirements so as to shift their mindset away from their traditionally-held views of thinking that news at that station is only for the ruling regime.
- Full Text:
- Date Issued: 2008
Resilience in families with a child living with Autism Spectrum Disorder
- Authors: Hanekom, Leché
- Date: 2008
- Subjects: Autism in children , Parents of autistic children , Autistic children -- Family relationships
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:9905 , http://hdl.handle.net/10948/973 , Autism in children , Parents of autistic children , Autistic children -- Family relationships
- Description: In recent years the number of studies on resilience emerging within the field of positive psychology has increased. However, such studies are limited within the South African context and so the proposed study aims to explore and describe the factors that facilitate adjustment and adaptation in South African families living with Autism Spectrum Disorder. McCubbin, McCubbin and Thompson (2001) developed the Resiliency Model of Family Stress, Adjustment and Adaptation which were used to conceptualise the family’s adaptation. Mothers (n = 19) from 19 families participated in the study. The families consisted of at least three members, of which two are parents and one a child younger than 18 years of age that has been diagnosed with Autistic Spectrum Disorder. A combination of non-probability purposive sampling and snowball sampling was used to select participants. The study had an exploratory and descriptive aim and employed triangulation of method, including both qualitative and quantitative data collection procedures. A biographical questionnaire and the following seven structured paper-and-pencil questionnaires were used: the Family Attachment and Changeability Index 8 (FACI8), the Family Crisis-oriented Personal Evaluation Scales (F-COPES), the Family Hardiness Index (FHI), the Family Problem-solving Communication (FPSC), the Family Time and Routine Index (FTRI), the Relative and Friend Support (RFS), and the Social Support Index (SSI). Descriptive statistics were used to describe the biographical information. Qualitative data were analysed by means of content analysis. Quantitative data were manipulated by means of correlation and regression analysis. The results from the quantitative analysis indicate three significant positive correlations with the FACI8. These variables were the family hardiness (measured by FHI), family problem-solving communication (measured by the FPSC), and family time and routines (measured by the FTRI). The findings from the qualitative analysis point out that social support, the spousal relationship and family time, togetherness and routines are the most important strength factors that contribute to the family’s adjustment and adaptation. Even though this study had a small sample size and several other limitations, the findings of this study could still assist in guiding specialised institutions toward providing more comprehensive information and support to families living with a child diagnosed with Autism Spectrum Disorder. This study also contributes to the studies on family resilience within a South African context.
- Full Text:
- Date Issued: 2008
- Authors: Hanekom, Leché
- Date: 2008
- Subjects: Autism in children , Parents of autistic children , Autistic children -- Family relationships
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:9905 , http://hdl.handle.net/10948/973 , Autism in children , Parents of autistic children , Autistic children -- Family relationships
- Description: In recent years the number of studies on resilience emerging within the field of positive psychology has increased. However, such studies are limited within the South African context and so the proposed study aims to explore and describe the factors that facilitate adjustment and adaptation in South African families living with Autism Spectrum Disorder. McCubbin, McCubbin and Thompson (2001) developed the Resiliency Model of Family Stress, Adjustment and Adaptation which were used to conceptualise the family’s adaptation. Mothers (n = 19) from 19 families participated in the study. The families consisted of at least three members, of which two are parents and one a child younger than 18 years of age that has been diagnosed with Autistic Spectrum Disorder. A combination of non-probability purposive sampling and snowball sampling was used to select participants. The study had an exploratory and descriptive aim and employed triangulation of method, including both qualitative and quantitative data collection procedures. A biographical questionnaire and the following seven structured paper-and-pencil questionnaires were used: the Family Attachment and Changeability Index 8 (FACI8), the Family Crisis-oriented Personal Evaluation Scales (F-COPES), the Family Hardiness Index (FHI), the Family Problem-solving Communication (FPSC), the Family Time and Routine Index (FTRI), the Relative and Friend Support (RFS), and the Social Support Index (SSI). Descriptive statistics were used to describe the biographical information. Qualitative data were analysed by means of content analysis. Quantitative data were manipulated by means of correlation and regression analysis. The results from the quantitative analysis indicate three significant positive correlations with the FACI8. These variables were the family hardiness (measured by FHI), family problem-solving communication (measured by the FPSC), and family time and routines (measured by the FTRI). The findings from the qualitative analysis point out that social support, the spousal relationship and family time, togetherness and routines are the most important strength factors that contribute to the family’s adjustment and adaptation. Even though this study had a small sample size and several other limitations, the findings of this study could still assist in guiding specialised institutions toward providing more comprehensive information and support to families living with a child diagnosed with Autism Spectrum Disorder. This study also contributes to the studies on family resilience within a South African context.
- Full Text:
- Date Issued: 2008
South Africa and Malaysia: identity and history in South-South relations
- Authors: Haron, Muhammed
- Date: 2008
- Subjects: Critical theory South Africa -- Foreign relations -- Malaysia Malaysia -- Foreign relations -- South Africa South Africa -- Politics and government -- History Malaysia -- Politics and government -- History South Africa -- Politics and government Malaysia -- Politics and government South Africa -- Social conditions -- History Malaysia -- Social conditions -- History South Africa -- Economic conditions Malaysia -- Economic conditions
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:2780 , http://hdl.handle.net/10962/d1002990
- Description: The focus of this thesis is on the bilateral relationship between South Africa and Malaysia. The thesis appropriates ‘critical theory,’ and as a flexible theoretical tool, and, as an open-ended, loose frame in order to give voice to the marginalized and voiceless from the South. The thesis thus looks at the politico-economic ties that have been developed and brings into view the socio-cultural relations that had been established between the peoples of the two sovereign nation-states during the apartheid and post-apartheid eras respectively. The basic purpose of this study was fivefold: (a) to contribute to the extant literature that concentrates on South Africa’s relations with Malaysia, (b) to examine the relationship at political and economic ties in some detail, (c) to demonstrate that apart from the afore-mentioned bonds IR specialists should also take into account the socio-cultural dimensions of international relations, (d) to bring to light the nation-state’s limitations when discussing the role of non-state actors and considering the contributions of other factors such as globalization, and (e) to stimulate further research on bilateral and multilateral relations in the South – particularly between South Africa and other states in Asia and Latin America - that would assist to better understand the past, present and perhaps the future.
- Full Text:
- Date Issued: 2008
- Authors: Haron, Muhammed
- Date: 2008
- Subjects: Critical theory South Africa -- Foreign relations -- Malaysia Malaysia -- Foreign relations -- South Africa South Africa -- Politics and government -- History Malaysia -- Politics and government -- History South Africa -- Politics and government Malaysia -- Politics and government South Africa -- Social conditions -- History Malaysia -- Social conditions -- History South Africa -- Economic conditions Malaysia -- Economic conditions
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:2780 , http://hdl.handle.net/10962/d1002990
- Description: The focus of this thesis is on the bilateral relationship between South Africa and Malaysia. The thesis appropriates ‘critical theory,’ and as a flexible theoretical tool, and, as an open-ended, loose frame in order to give voice to the marginalized and voiceless from the South. The thesis thus looks at the politico-economic ties that have been developed and brings into view the socio-cultural relations that had been established between the peoples of the two sovereign nation-states during the apartheid and post-apartheid eras respectively. The basic purpose of this study was fivefold: (a) to contribute to the extant literature that concentrates on South Africa’s relations with Malaysia, (b) to examine the relationship at political and economic ties in some detail, (c) to demonstrate that apart from the afore-mentioned bonds IR specialists should also take into account the socio-cultural dimensions of international relations, (d) to bring to light the nation-state’s limitations when discussing the role of non-state actors and considering the contributions of other factors such as globalization, and (e) to stimulate further research on bilateral and multilateral relations in the South – particularly between South Africa and other states in Asia and Latin America - that would assist to better understand the past, present and perhaps the future.
- Full Text:
- Date Issued: 2008
Model selection for cointegrated relationships in small samples
- He, Wei
- Authors: He, Wei
- Date: 2008
- Subjects: Economics -- Statistical methods , Cointegration -- South Africa , Econometrics
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:10570 , http://hdl.handle.net/10948/971 , Economics -- Statistical methods , Cointegration -- South Africa , Econometrics
- Description: Vector autoregression models have become widely used research tools in the analysis of macroeconomic time series. Cointegrated techniques are an essential part of empirical macroeconomic research. They infer causal long-run relationships between nonstationary variables. In this study, six information criteria were reviewed and compared. The methods focused on determining the optimum information criteria for detecting the correct lag structure of a two-variable cointegrated process.
- Full Text:
- Date Issued: 2008
- Authors: He, Wei
- Date: 2008
- Subjects: Economics -- Statistical methods , Cointegration -- South Africa , Econometrics
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:10570 , http://hdl.handle.net/10948/971 , Economics -- Statistical methods , Cointegration -- South Africa , Econometrics
- Description: Vector autoregression models have become widely used research tools in the analysis of macroeconomic time series. Cointegrated techniques are an essential part of empirical macroeconomic research. They infer causal long-run relationships between nonstationary variables. In this study, six information criteria were reviewed and compared. The methods focused on determining the optimum information criteria for detecting the correct lag structure of a two-variable cointegrated process.
- Full Text:
- Date Issued: 2008
Composition and phenology of insect pests of Capsicum (Solanaceae) cultivated in the Makana District, Eastern Cape Province, South Africa
- Authors: Hepburn, Colleen
- Date: 2008
- Subjects: Insects -- South Africa -- Eastern Cape -- Composition Insects -- South Africa -- Eastern Cape -- Phenology Agricultural pests -- South Africa -- Eastern Cape Peppers -- Diseases and pests -- South Africa -- Eastern Cape Solanaceae -- Diseases and pests -- South Africa -- Eastern Cape Insect pests -- South Africa -- Eastern Cape Insect pests -- Biological control -- South Africa -- Eastern Cape Insect pests -- Control -- Methods -- South Africa -- Eastern Cape Insects -- Host plants -- South Africa -- Eastern Cape Insect-plant relationships -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5656 , http://hdl.handle.net/10962/d1005339
- Description: Capsicum baccatum var. pendulum was first grown in the Makana District in 2005. Extremely little was known about best practices for cultivation or the insects and diseases associated with the crop in this area. The study was conducted during the second year of production, November 2005 and November 2006, in an attempt to identify the composition and phenology of insects occurring on C. baccatum. In the more rural parts of the Eastern Cape, and more particularly in Grahamstown, there are very few industries. With the advent of this new agricultural venture, a processing factory has been opened in Grahamstown creating more than 600 seasonal jobs in the factory and 1000 seasonal jobs on farms for local people. This business enterprise has not only brought about the creation of jobs, but also training and skills development and empowerment, generating much-needed income in this area. An extensive literature review yielded limited information on insect pests associated with Capsicum. Data from a pilot sampling trial undertaken were statistically analyzed to establish the number of plants to be scouted per site and the most effective scouting techniques to use. Based on the data available and insects collected during the pilot sampling trial, a surveillance programme was designed. Five different types of monitoring traps were placed in each of the eight study sites. Collection of trap catches and scouting of fifteen individual plants per site was undertaken on a weekly basis over the 52-week study period. The most commonly occurring potential insect pests were African Bollworm Helicoverpa armigera (Hübner), False Codling Moth Thaumatotibia leucotreta (= Cryptophlebia leucotreta) (Meyrick), Mediterranean Fruit Fly Ceratitis capitata (Wiedemann) and several species of thrips. Population densities of these pests and their phenology on Capsicum were determined. Statistical analyses established the efficacy of the monitoring traps for each pest, tested for differences among and between study sites, calculated an estimate of the number of pods damaged and a measure of plant damage.The results show that the majority of damage caused to the Capsicum baccatum cropping system was due to Mediterranean Fruit Fly populations. It was established that, although African Bollworm and False Codling Moth were present during the study period, their numbers were negligible and only nominal damage was caused by these pests. Damage caused by thrips species was apparent but not quantifiable. Intervention strategies using an Integrated Pest Management approach, are discussed.
- Full Text:
- Date Issued: 2008
- Authors: Hepburn, Colleen
- Date: 2008
- Subjects: Insects -- South Africa -- Eastern Cape -- Composition Insects -- South Africa -- Eastern Cape -- Phenology Agricultural pests -- South Africa -- Eastern Cape Peppers -- Diseases and pests -- South Africa -- Eastern Cape Solanaceae -- Diseases and pests -- South Africa -- Eastern Cape Insect pests -- South Africa -- Eastern Cape Insect pests -- Biological control -- South Africa -- Eastern Cape Insect pests -- Control -- Methods -- South Africa -- Eastern Cape Insects -- Host plants -- South Africa -- Eastern Cape Insect-plant relationships -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5656 , http://hdl.handle.net/10962/d1005339
- Description: Capsicum baccatum var. pendulum was first grown in the Makana District in 2005. Extremely little was known about best practices for cultivation or the insects and diseases associated with the crop in this area. The study was conducted during the second year of production, November 2005 and November 2006, in an attempt to identify the composition and phenology of insects occurring on C. baccatum. In the more rural parts of the Eastern Cape, and more particularly in Grahamstown, there are very few industries. With the advent of this new agricultural venture, a processing factory has been opened in Grahamstown creating more than 600 seasonal jobs in the factory and 1000 seasonal jobs on farms for local people. This business enterprise has not only brought about the creation of jobs, but also training and skills development and empowerment, generating much-needed income in this area. An extensive literature review yielded limited information on insect pests associated with Capsicum. Data from a pilot sampling trial undertaken were statistically analyzed to establish the number of plants to be scouted per site and the most effective scouting techniques to use. Based on the data available and insects collected during the pilot sampling trial, a surveillance programme was designed. Five different types of monitoring traps were placed in each of the eight study sites. Collection of trap catches and scouting of fifteen individual plants per site was undertaken on a weekly basis over the 52-week study period. The most commonly occurring potential insect pests were African Bollworm Helicoverpa armigera (Hübner), False Codling Moth Thaumatotibia leucotreta (= Cryptophlebia leucotreta) (Meyrick), Mediterranean Fruit Fly Ceratitis capitata (Wiedemann) and several species of thrips. Population densities of these pests and their phenology on Capsicum were determined. Statistical analyses established the efficacy of the monitoring traps for each pest, tested for differences among and between study sites, calculated an estimate of the number of pods damaged and a measure of plant damage.The results show that the majority of damage caused to the Capsicum baccatum cropping system was due to Mediterranean Fruit Fly populations. It was established that, although African Bollworm and False Codling Moth were present during the study period, their numbers were negligible and only nominal damage was caused by these pests. Damage caused by thrips species was apparent but not quantifiable. Intervention strategies using an Integrated Pest Management approach, are discussed.
- Full Text:
- Date Issued: 2008
Die liturgiese gebruik van die orrel in 'n post-mordene era: persepsies van kerkmusici en leraars van die Nederduitse Gereformeerde gemeentes in Port Elizabeth
- Authors: Heunis, Sulani
- Date: 2008
- Subjects: Organ music -- South Africa -- Port Elizabeth , Chorale preludes
- Language: Afrikaans
- Type: Thesis , Masters , MMus
- Identifier: vital:8511 , http://hdl.handle.net/10948/787 , Organ music -- South Africa -- Port Elizabeth , Chorale preludes
- Description: In this study the liturgical usage of the organ is investigated within a post-modern society. It focuses specifically on the church services of the Dutch Reformed Congregations of Port Elizabeth with regards to the functionality of the organ during morning and evening services. The objectives of the study are to demonstrate the current situation of musical worship in the Dutch Reformed Congregations of Port Elizabeth. Furthermore it serves as a way to indicate any deficiency in the field, which would need to be addressed. In order to achieve these objectives, both a qualitative and quantitative study is undertaken. The qualitative study investigates existing literature regarding the church service and its music. The quantitative study comprises an analysis of self-administered questionnaires that was handed over for completion by the Dutch Reformed Congregations of Port Elizabeth. The results obtained were electronically processed to percentages and graphic illustrations. In this mini-treatise it is argued that the usage of other music instruments (in the form of music worship groups) during church services could possibly lead to a change in the liturgical function of the organ. It was found that the usage of the organ in the Dutch Reformed Congregations of Port Elizabeth was mainly retained during morning services. During evening services however, the usage of other music instruments was in the majority, which resulted in a decrease of organ usage. It was further discovered that a large group of organists are not involved with music worship groups. Training of organists in a contemporary style of music worship will therefore serve as a significant purpose to fulfil this deficiency.
- Full Text:
- Date Issued: 2008
- Authors: Heunis, Sulani
- Date: 2008
- Subjects: Organ music -- South Africa -- Port Elizabeth , Chorale preludes
- Language: Afrikaans
- Type: Thesis , Masters , MMus
- Identifier: vital:8511 , http://hdl.handle.net/10948/787 , Organ music -- South Africa -- Port Elizabeth , Chorale preludes
- Description: In this study the liturgical usage of the organ is investigated within a post-modern society. It focuses specifically on the church services of the Dutch Reformed Congregations of Port Elizabeth with regards to the functionality of the organ during morning and evening services. The objectives of the study are to demonstrate the current situation of musical worship in the Dutch Reformed Congregations of Port Elizabeth. Furthermore it serves as a way to indicate any deficiency in the field, which would need to be addressed. In order to achieve these objectives, both a qualitative and quantitative study is undertaken. The qualitative study investigates existing literature regarding the church service and its music. The quantitative study comprises an analysis of self-administered questionnaires that was handed over for completion by the Dutch Reformed Congregations of Port Elizabeth. The results obtained were electronically processed to percentages and graphic illustrations. In this mini-treatise it is argued that the usage of other music instruments (in the form of music worship groups) during church services could possibly lead to a change in the liturgical function of the organ. It was found that the usage of the organ in the Dutch Reformed Congregations of Port Elizabeth was mainly retained during morning services. During evening services however, the usage of other music instruments was in the majority, which resulted in a decrease of organ usage. It was further discovered that a large group of organists are not involved with music worship groups. Training of organists in a contemporary style of music worship will therefore serve as a significant purpose to fulfil this deficiency.
- Full Text:
- Date Issued: 2008
A stable isotope approach to trophic ecology resolving food webs in intertidal ecosystems
- Authors: Hill, Jaclyn Marie
- Date: 2008
- Subjects: Stable isotopes Food chains (Ecology) Stable isotopes in ecological research Intertidal ecology Mussels -- South Africa
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5771 , http://hdl.handle.net/10962/d1005459
- Description: There are broad differences in regional oceanography and primary production around the South African coast, which we might expect to give rise to major differences in trophic pathways. δ⁻¹³C and δ⁻¹⁵N isotopic ratios of suspended particulate matter (SPM), mussels, various intertidal consumers and common macroalgae along the South African coastline were explored using stable isotope analysis to investigate biogeographic and temporal variability of isotopic signatures of marine intertidal consumers and their food sources around the coast of South Africa, with a focus on evaluating the dependence of intertidal mussels on phytoplankton and macroalgal-derived organic carbon. Isotopic equilibration rates of four mussel tissues were determined through laboratory feeding experiments, which established that adductor tissue had the slowest isotopic turnover rate, and was subsequently used as an indication of overall mussel diet. Biogeographic, temporal and nearshore/offshore trends of isotopic ratios of SPM were investigated along 10km transects perpendicular to the coast and SPM exhibited overall trends of carbon depletion when moving from west to east along the coastline and from nearshore to offshore water, in both cases suggesting a shift from macrophyte detritus to a phytoplankton signature. δ⁻¹³C signatures of SPM also revealed temporal and biogeographic variation that had strong ties to local oceanography, being closely correlated to regional hydrographic features and tidal influences. Mixing models indicated filter feeders demonstrated over 50% dependence on nearshore SPM for organic carbon and it was possible to categorize them into geographic groups based on their carbon and nitrogen signatures, suggesting biogeographic shifts in resources. Biogeographic shifts in diet were also seen in some grazers. Difficulties in relating macroalgae to mussel diet led to investigations into the isotopic changes associated with macroalgal decomposition. Variation in photosynthetic fractionation, leaching and microbial mineralization are believed to have resulted from species-specific patterns of degradation. Although the strong links between carbon signatures and local oceanography indicate that stable isotope analysis is a powerful tool for the study of water mixing and coastal hydrography in relation to food-web analyses, substantial variation in fractionation of primary consumers, along with different periods of time integration between consumers and their food sources must be considered in future studies, to resolve trophic links in marine food webs successfully.
- Full Text:
- Date Issued: 2008
- Authors: Hill, Jaclyn Marie
- Date: 2008
- Subjects: Stable isotopes Food chains (Ecology) Stable isotopes in ecological research Intertidal ecology Mussels -- South Africa
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5771 , http://hdl.handle.net/10962/d1005459
- Description: There are broad differences in regional oceanography and primary production around the South African coast, which we might expect to give rise to major differences in trophic pathways. δ⁻¹³C and δ⁻¹⁵N isotopic ratios of suspended particulate matter (SPM), mussels, various intertidal consumers and common macroalgae along the South African coastline were explored using stable isotope analysis to investigate biogeographic and temporal variability of isotopic signatures of marine intertidal consumers and their food sources around the coast of South Africa, with a focus on evaluating the dependence of intertidal mussels on phytoplankton and macroalgal-derived organic carbon. Isotopic equilibration rates of four mussel tissues were determined through laboratory feeding experiments, which established that adductor tissue had the slowest isotopic turnover rate, and was subsequently used as an indication of overall mussel diet. Biogeographic, temporal and nearshore/offshore trends of isotopic ratios of SPM were investigated along 10km transects perpendicular to the coast and SPM exhibited overall trends of carbon depletion when moving from west to east along the coastline and from nearshore to offshore water, in both cases suggesting a shift from macrophyte detritus to a phytoplankton signature. δ⁻¹³C signatures of SPM also revealed temporal and biogeographic variation that had strong ties to local oceanography, being closely correlated to regional hydrographic features and tidal influences. Mixing models indicated filter feeders demonstrated over 50% dependence on nearshore SPM for organic carbon and it was possible to categorize them into geographic groups based on their carbon and nitrogen signatures, suggesting biogeographic shifts in resources. Biogeographic shifts in diet were also seen in some grazers. Difficulties in relating macroalgae to mussel diet led to investigations into the isotopic changes associated with macroalgal decomposition. Variation in photosynthetic fractionation, leaching and microbial mineralization are believed to have resulted from species-specific patterns of degradation. Although the strong links between carbon signatures and local oceanography indicate that stable isotope analysis is a powerful tool for the study of water mixing and coastal hydrography in relation to food-web analyses, substantial variation in fractionation of primary consumers, along with different periods of time integration between consumers and their food sources must be considered in future studies, to resolve trophic links in marine food webs successfully.
- Full Text:
- Date Issued: 2008
Education in the wetlands and wetlands in the education: a case of contextualizing primary/basic education in Tanzania
- Authors: Hogan, Alice Rosemary
- Date: 2008
- Subjects: Education -- Tanzania Environmental education -- Tanzania Education, Rural -- Tanzania Education -- Curricula -- Tanzania Community and school -- Tanzania
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1504 , http://hdl.handle.net/10962/d1003386
- Description: This dissertation describes an action research case study carried out at a sub-village school at Nyamakurukuru, Utete, Rufiji District, Tanzania. The study was a fully independent research activity funded and led by a female Irish environmental and community specialist who has fifteen years experience of working in rural Tanzania, five of which were in Rufiji District. The aim of the action research was to engage a community of villagers, teachers, students and district officers in a participatory process to adapt a module of a school curriculum to the local context, and teach it in order to describe one way in which contextualization, using local and indigenous knowledge and active discovery teaching-learning processes, can be done. The major research question, which I wished to answer for one specific case, was: Does integrating local environmental cultural knowledge into formal schooling contribute to curriculum relevance? If so, in what way? This document describes the background and context of the research, the motivation and the theoretical basis for the work, the methodology and methods, and the action research process itself. The results are interpreted and discussed in the light of current theoretical perspectives on education and environmental education. The main findings within the case are that: Contextualization improved relevance of education and thus its quality by: • breaking through traditional frames/barriers between teachers and students, students and elders and community and teachers, • allowing formal education to take place outside of the school, • necessitating a change in pedagogy1 to more learner-centered, discovery methods, • allowing indigenous knowledge to come into the classroom, • stimulating creativity and increased confidence, and • bringing local socio-political environmental issues into the classroom. This study provides a case example of how education processes, when engaging local cultural knowledge, can improve the relevance, and thus an aspect of the quality of teaching and learning in school-community contexts, while providing a conduit for integrating environmental education into the formal school curriculum. It provides insights into the key issue of relevance which currently faces educators of children in wetlands in Tanzania. Recommendations were made for the case studied and may be useful beyond the boundaries of the case: • Give more explicit government policy and strategic support for community involvement in educational content–epistemologies and pedagogies. • Weaken framing (hierarchical power positions) to encourage greater partnership between school, home and community to improve relevance. • Investigate the provision of education beyond schools. • Provide practical teacher and community training on use of learner-centered, discovery and active pedagogies. • Provide teacher and community education on biodiversity and the environment. • Provide relevant reference texts and research data on the ecology, biodiversity, vegetation, hydrology, agriculture, sociology, history and other relevant subjects. • Officially nurture a culture that learning should be enjoyable. • Allow the curriculum freedom, in these times of increasing risk for rural tropical wetland communities, to make the curriculum fit the local issues rather than vice versa. • Nurture critical analysis of the curriculum in local pedagogic discourse i.e., at the local contextualization level of the home, community and school.
- Full Text:
- Date Issued: 2008
- Authors: Hogan, Alice Rosemary
- Date: 2008
- Subjects: Education -- Tanzania Environmental education -- Tanzania Education, Rural -- Tanzania Education -- Curricula -- Tanzania Community and school -- Tanzania
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1504 , http://hdl.handle.net/10962/d1003386
- Description: This dissertation describes an action research case study carried out at a sub-village school at Nyamakurukuru, Utete, Rufiji District, Tanzania. The study was a fully independent research activity funded and led by a female Irish environmental and community specialist who has fifteen years experience of working in rural Tanzania, five of which were in Rufiji District. The aim of the action research was to engage a community of villagers, teachers, students and district officers in a participatory process to adapt a module of a school curriculum to the local context, and teach it in order to describe one way in which contextualization, using local and indigenous knowledge and active discovery teaching-learning processes, can be done. The major research question, which I wished to answer for one specific case, was: Does integrating local environmental cultural knowledge into formal schooling contribute to curriculum relevance? If so, in what way? This document describes the background and context of the research, the motivation and the theoretical basis for the work, the methodology and methods, and the action research process itself. The results are interpreted and discussed in the light of current theoretical perspectives on education and environmental education. The main findings within the case are that: Contextualization improved relevance of education and thus its quality by: • breaking through traditional frames/barriers between teachers and students, students and elders and community and teachers, • allowing formal education to take place outside of the school, • necessitating a change in pedagogy1 to more learner-centered, discovery methods, • allowing indigenous knowledge to come into the classroom, • stimulating creativity and increased confidence, and • bringing local socio-political environmental issues into the classroom. This study provides a case example of how education processes, when engaging local cultural knowledge, can improve the relevance, and thus an aspect of the quality of teaching and learning in school-community contexts, while providing a conduit for integrating environmental education into the formal school curriculum. It provides insights into the key issue of relevance which currently faces educators of children in wetlands in Tanzania. Recommendations were made for the case studied and may be useful beyond the boundaries of the case: • Give more explicit government policy and strategic support for community involvement in educational content–epistemologies and pedagogies. • Weaken framing (hierarchical power positions) to encourage greater partnership between school, home and community to improve relevance. • Investigate the provision of education beyond schools. • Provide practical teacher and community training on use of learner-centered, discovery and active pedagogies. • Provide teacher and community education on biodiversity and the environment. • Provide relevant reference texts and research data on the ecology, biodiversity, vegetation, hydrology, agriculture, sociology, history and other relevant subjects. • Officially nurture a culture that learning should be enjoyable. • Allow the curriculum freedom, in these times of increasing risk for rural tropical wetland communities, to make the curriculum fit the local issues rather than vice versa. • Nurture critical analysis of the curriculum in local pedagogic discourse i.e., at the local contextualization level of the home, community and school.
- Full Text:
- Date Issued: 2008
Her master's: the experiences of mature women in postgraduate study
- Authors: Hood, Mary Ann
- Date: 2008
- Subjects: Women graduate students -- South Africa , Women scholars -- South Africa , Women -- Education (Graduate)
- Language: English
- Type: Thesis , Masters , M Ed
- Identifier: vital:16159 , http://hdl.handle.net/10353/211 , Women graduate students -- South Africa , Women scholars -- South Africa , Women -- Education (Graduate)
- Description: This study explored the experiences of mature women undertaking Master’s degrees at a Historically Disadvantaged Institution of Higher Learning in South Africa. Attaining a Master’s degree is a significant milestone in education and the process may take from one to three, or more, years. The study aims to describe aspects of the women’s experiences of their research journeys and the goal of the study is to present descriptions of these experiences. The methodology is qualitative and uses a critical feminist approach, appropriate to exploring the research questions. A critical feminist stance holds that women experience the world differently to men given the patriarchal structure of society. Emphasis is placed on the primacy of the co-researcher’s perceptions of their experiences. A single method research design was followed using semi-structured interviews. The analysis resulted in the emergence of a number of central themes. Together these reflect the experiences of the co-researchers, although they did not automatically share all the experiences. The findings show that postgraduate study, in the form of a Master’s degree, was found to be transformative, meaningful and worthwhile, although not without difficulties; mainly the demands required of multiple roles within home, community, work, and the university. This study contributes towards the larger body of research within education, in particular in the understanding the experiences of mature women within the field of postgraduate study.
- Full Text:
- Date Issued: 2008
- Authors: Hood, Mary Ann
- Date: 2008
- Subjects: Women graduate students -- South Africa , Women scholars -- South Africa , Women -- Education (Graduate)
- Language: English
- Type: Thesis , Masters , M Ed
- Identifier: vital:16159 , http://hdl.handle.net/10353/211 , Women graduate students -- South Africa , Women scholars -- South Africa , Women -- Education (Graduate)
- Description: This study explored the experiences of mature women undertaking Master’s degrees at a Historically Disadvantaged Institution of Higher Learning in South Africa. Attaining a Master’s degree is a significant milestone in education and the process may take from one to three, or more, years. The study aims to describe aspects of the women’s experiences of their research journeys and the goal of the study is to present descriptions of these experiences. The methodology is qualitative and uses a critical feminist approach, appropriate to exploring the research questions. A critical feminist stance holds that women experience the world differently to men given the patriarchal structure of society. Emphasis is placed on the primacy of the co-researcher’s perceptions of their experiences. A single method research design was followed using semi-structured interviews. The analysis resulted in the emergence of a number of central themes. Together these reflect the experiences of the co-researchers, although they did not automatically share all the experiences. The findings show that postgraduate study, in the form of a Master’s degree, was found to be transformative, meaningful and worthwhile, although not without difficulties; mainly the demands required of multiple roles within home, community, work, and the university. This study contributes towards the larger body of research within education, in particular in the understanding the experiences of mature women within the field of postgraduate study.
- Full Text:
- Date Issued: 2008
Learning organisations: an exploration of the extent to which early childhood development non-government organisations (NGOS) in the Eastern Cape Province are learning organisations
- Authors: Hornby, Diana Scot
- Date: 2008
- Subjects: Early childhood education , Child development , Child psychology , Non-governmental organizations -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , M Soc Sc (Community Development)
- Identifier: vital:11843 , http://hdl.handle.net/10353/242 , Early childhood education , Child development , Child psychology , Non-governmental organizations -- South Africa -- Eastern Cape
- Description: The first decade of democracy marks a massive transition in the life of South African children. The South African Constitution is perhaps the most assertive affirmation of the rights of children any where in the world. The new Government has highlighted the plight of young children by publishing the first white paper for children under the age of 6 years: Education White Paper (5) on Early Childhood Development (RSA, 2001) as well as other policies to guide an integrated developmental approach to early childhood services. Despite progress, according to Porteus (in Chisholm 2004), the gains have not been strong enough to work against the momentum of inequity facing the nation’s young. Non Government Organisations have played a key role over the past thirty years to establish services that address the developmental needs of disadvantaged young children under the age of 6 years. Their challenge now, is to respond to the changes in a transforming state and provide services that are relevant and appropriate. There has been a ‘realignment’ occurring in the ECD sector where activities have shifted beyond the formal classroom possibilities to pro-child social development. This adjustment is making huge demands on the ECD sector as they grapple with the paradigm shift. The Learning Organisation is a strategy that allows organisations to re-invent themselves and remain relevant. The focus of this study examines five ECD NGO’s in the Eastern Cape Province, to assess the extent to which they meet the characteristics that make a learning organisation, in the current democratic context of South Africa. The research was qualitative in nature and utilizing the case study method and through semi-structured interview schedules and document analysis, the researcher was able to gain insight into the Organisations. The Directors in five organisations formed the core of the research sample. The research findings suggest that although the Directors are grappling with the paradigm shift to an integrated, pro-child social development approach, the human resources within organisations are not being fully mobilised, enhanced and tapped. Practicing a Learning Organisation strategy would assist the ECD NGO’s to re-invent themselves, but the research findings suggest that these characteristics remain under-utilized.
- Full Text:
- Date Issued: 2008
- Authors: Hornby, Diana Scot
- Date: 2008
- Subjects: Early childhood education , Child development , Child psychology , Non-governmental organizations -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , M Soc Sc (Community Development)
- Identifier: vital:11843 , http://hdl.handle.net/10353/242 , Early childhood education , Child development , Child psychology , Non-governmental organizations -- South Africa -- Eastern Cape
- Description: The first decade of democracy marks a massive transition in the life of South African children. The South African Constitution is perhaps the most assertive affirmation of the rights of children any where in the world. The new Government has highlighted the plight of young children by publishing the first white paper for children under the age of 6 years: Education White Paper (5) on Early Childhood Development (RSA, 2001) as well as other policies to guide an integrated developmental approach to early childhood services. Despite progress, according to Porteus (in Chisholm 2004), the gains have not been strong enough to work against the momentum of inequity facing the nation’s young. Non Government Organisations have played a key role over the past thirty years to establish services that address the developmental needs of disadvantaged young children under the age of 6 years. Their challenge now, is to respond to the changes in a transforming state and provide services that are relevant and appropriate. There has been a ‘realignment’ occurring in the ECD sector where activities have shifted beyond the formal classroom possibilities to pro-child social development. This adjustment is making huge demands on the ECD sector as they grapple with the paradigm shift. The Learning Organisation is a strategy that allows organisations to re-invent themselves and remain relevant. The focus of this study examines five ECD NGO’s in the Eastern Cape Province, to assess the extent to which they meet the characteristics that make a learning organisation, in the current democratic context of South Africa. The research was qualitative in nature and utilizing the case study method and through semi-structured interview schedules and document analysis, the researcher was able to gain insight into the Organisations. The Directors in five organisations formed the core of the research sample. The research findings suggest that although the Directors are grappling with the paradigm shift to an integrated, pro-child social development approach, the human resources within organisations are not being fully mobilised, enhanced and tapped. Practicing a Learning Organisation strategy would assist the ECD NGO’s to re-invent themselves, but the research findings suggest that these characteristics remain under-utilized.
- Full Text:
- Date Issued: 2008
Microfinance sustainability versus development objectives: an assessment of the South African environment
- Authors: Hoskinson, Brenda
- Date: 2008
- Subjects: Microfinance -- South Africa South Africa -- Economic conditions -- 1991- Poor -- Finance, Personal Microfinance -- South Africa Case studies
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2782 , http://hdl.handle.net/10962/d1002992
- Description: In a world where almost half of the population lives in poverty, the alleviation of poverty is a serious developmental challenge for many states. Microfinance has grown in popularity as a means for achieving poverty reduction all over the world. Due to the success of microfinance institutions, such as the Grameen Bank, in achieving self-sufficiency and improving the lives of its clients, the expectations for similar institutions are high. MFIs attempt to find a balance between business and development goals. It is not necessarily a contradiction to be a business seeking profit as well as being an institution committed to development. However, the values coupled with these two objectives are sometimes conflicting. Thus it is important to see how equilibrium can be achieved and to note what sacrifices must be made in order to reach a balance. This thesis will focus on examining and assessing the challenges faced by South African MFIs in balancing development goals while at the same time having to be self-sufficient. The Small Enterprise Foundation will be used as a case study to consider the particular experiences of a South African MFI. The evaluation of the unique challenges that the South African landscape presents will provide a context in which to understand microfinance operations and a clearer understanding of the particular problems and challenges faced by the South African micro-finance industry in balancing the achievement of development goals against the imperative to be self sustainable in providing services to the poor. Through that understanding the common conception of what makes a “successful” MFI will also be challenged.
- Full Text:
- Date Issued: 2008
- Authors: Hoskinson, Brenda
- Date: 2008
- Subjects: Microfinance -- South Africa South Africa -- Economic conditions -- 1991- Poor -- Finance, Personal Microfinance -- South Africa Case studies
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2782 , http://hdl.handle.net/10962/d1002992
- Description: In a world where almost half of the population lives in poverty, the alleviation of poverty is a serious developmental challenge for many states. Microfinance has grown in popularity as a means for achieving poverty reduction all over the world. Due to the success of microfinance institutions, such as the Grameen Bank, in achieving self-sufficiency and improving the lives of its clients, the expectations for similar institutions are high. MFIs attempt to find a balance between business and development goals. It is not necessarily a contradiction to be a business seeking profit as well as being an institution committed to development. However, the values coupled with these two objectives are sometimes conflicting. Thus it is important to see how equilibrium can be achieved and to note what sacrifices must be made in order to reach a balance. This thesis will focus on examining and assessing the challenges faced by South African MFIs in balancing development goals while at the same time having to be self-sufficient. The Small Enterprise Foundation will be used as a case study to consider the particular experiences of a South African MFI. The evaluation of the unique challenges that the South African landscape presents will provide a context in which to understand microfinance operations and a clearer understanding of the particular problems and challenges faced by the South African micro-finance industry in balancing the achievement of development goals against the imperative to be self sustainable in providing services to the poor. Through that understanding the common conception of what makes a “successful” MFI will also be challenged.
- Full Text:
- Date Issued: 2008
The perceptions of Chinese tourists of the Western Cape Region travel destination
- Authors: Hu, Jiang
- Date: 2008
- Subjects: Chinese -- Travel -- South Africa -- Western Cape -- Attitudes , Tourism -- South Africa -- Marketing , Tourism -- South Africa
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: vital:9365 , http://hdl.handle.net/10948/967 , Chinese -- Travel -- South Africa -- Western Cape -- Attitudes , Tourism -- South Africa -- Marketing , Tourism -- South Africa
- Description: As a result of significantly improving relationship between South Africa and China, Chinese tourists traveling to South Africa have become a more noticeable group of travelers. More and more Chinese tourists choose South Africa as a tourism destination; especially Cape Town in the Western Cape region for a variety purposes such as relaxation, business and/or shopping. This research investigates the perceptions and motivation of Chinese tourists coming to the Western Cape region of South Africa. The proposed strategy of promoting the Western Cape region as a travel destination can be made based on the perceptions and motivation of Chinese tourists to the Western Cape. The study focuses on clearly understanding the perception of Chinese tourists by studying tourist behaviour and consumer motivation. The process of decision making and factors impacting on decision making are addressed in the research. A survey questionnaire was administered to Chinese tourists visiting South Africa. The primary data received by questionnaire was analyzed to show what actually Chinese tourists consider Western Cape as a travel destination. The Statistical Package of Social Science (SPSS) was utilized for analysis of data collected by the questionnaire. These general groups of data are discussed in the research. There are personal information, the motivation for travelling, and perceptions of respondents in the Western Cape region in South Africa.
- Full Text:
- Date Issued: 2008
- Authors: Hu, Jiang
- Date: 2008
- Subjects: Chinese -- Travel -- South Africa -- Western Cape -- Attitudes , Tourism -- South Africa -- Marketing , Tourism -- South Africa
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: vital:9365 , http://hdl.handle.net/10948/967 , Chinese -- Travel -- South Africa -- Western Cape -- Attitudes , Tourism -- South Africa -- Marketing , Tourism -- South Africa
- Description: As a result of significantly improving relationship between South Africa and China, Chinese tourists traveling to South Africa have become a more noticeable group of travelers. More and more Chinese tourists choose South Africa as a tourism destination; especially Cape Town in the Western Cape region for a variety purposes such as relaxation, business and/or shopping. This research investigates the perceptions and motivation of Chinese tourists coming to the Western Cape region of South Africa. The proposed strategy of promoting the Western Cape region as a travel destination can be made based on the perceptions and motivation of Chinese tourists to the Western Cape. The study focuses on clearly understanding the perception of Chinese tourists by studying tourist behaviour and consumer motivation. The process of decision making and factors impacting on decision making are addressed in the research. A survey questionnaire was administered to Chinese tourists visiting South Africa. The primary data received by questionnaire was analyzed to show what actually Chinese tourists consider Western Cape as a travel destination. The Statistical Package of Social Science (SPSS) was utilized for analysis of data collected by the questionnaire. These general groups of data are discussed in the research. There are personal information, the motivation for travelling, and perceptions of respondents in the Western Cape region in South Africa.
- Full Text:
- Date Issued: 2008
Utility of the cognitive assessment system (CAS) to predict reading proficiency in grade 1
- Authors: Hüttenrauch, Maria Eleonore
- Date: 2008
- Subjects: Das-Naglieri Cognitive Assessment System , Intelligence tests for preliterates , Cognition in children , Reading disability
- Language: English
- Type: Thesis , Doctoral , DPhil
- Identifier: vital:9839 , http://hdl.handle.net/10948/965 , Das-Naglieri Cognitive Assessment System , Intelligence tests for preliterates , Cognition in children , Reading disability
- Description: Reading disability, as the most commonly diagnosed learning disability, continues to pose a tenacious problem to teachers, practitioners and researchers. In an effort to understand the causes of reading disability, voluminous research has been undertaken over the past decades to pinpoint its causes or developmental stumbling blocks. One approach, the Planning, Attention, Simultaneous, and Successive processing (PASS) model, combines neuropsychological theory with elements from cognitive psychology. Based on this model, the Cognitive Assessment System (CAS), as well as methods of intervention for reading disability were developed. Although many studies have been conducted that investigated reading disability in terms of PASS cognitive processes, the final version of the CAS and its predictive utility with respect to reading disability has not been explored to date. The present study aimed to investigate the utility of the CAS, administered at the beginning of grade 1, to predict reading proficiency at the end of grade 1. The sample was comprised of 119 “average” (i.e., belonging to the general population) grade 1 students from schools of the Calgary Board of Education (CBE). The Basic Battery of the CAS was administered to the children in the sample at the beginning of grade 1, as well as four reading subtests of the Woodcock-Johnson Tests of Achievement – Third Edition (WJ-III ACH) at the end of grade 1. The WJ-III ACH yielded a cluster score for basic reading and one for reading comprehension. Correlational and regression analyses were used to address the first aim of this study, namely to explore the relationship between students’ scores on the CAS and their later reading proficiency. To this end, the children’s CAS Full Scale scores and WJ-III ACH cluster scores were subjected to a hierarchical regression analysis, whereby age, gender, and - xviii - SES were kept constant by entering them first in the equation. Next, the relationship between students’ PASS scale scores and the CAS subtest scores respectively and scores on the WJ-III ACH Basic Reading and Reading Comprehension Cluster scores was explored by means of stepwise regression analysis. To improve on the generalizability of results, the regression analyses were conducted on a randomly drawn analysis sample consisting of 80% of the sample, and cross-validated on the remaining 20% of the sample. The second aim of the present study was to ascertain whether clusters could be identified on the basis of CAS performance as well as levels of reading proficiency. To this end, the children’s CAS FS scores, PASS scale scores, and CAS subtest scores were subjected to cluster analyses. The investigation of aim 1 yielded some encouraging results, in that it was found that, together with the covariates: • The CAS FS emerged as a moderately strong predictor of both basic reading and reading comprehension; • Successive processing, in particular the Word Series subtest, significantly predicted basic reading skills; • Successive and simultaneous processing, particularly the Nonverbal Matrices and Sentence Repetition subtests, were significant predictors of reading comprehension; The second aim, which explored the relationship between patterns of CAS cognitive processes and their relationship with reading proficiency, yielded: • Two clusters with distinctly different PASS scale scores and with significant differences between their levels of reading proficiency. Higher PASS scales scores, particularly on the Attention and Planning scales, were associated with higher reading proficiency scores. • Four clusters with distinctly different CAS subtest scores that were also associated with distinctly different levels of reading performance. Good - xix - reading proficiency was associated with good CAS performance, whereas weaker reading proficiency was linked to weaker CAS performance. Biographical variables, such as age and SES were found to be related to performance on the CAS and reading proficiency, while gender did not emerge as an important predictor variable. The present study demonstrated the usefulness of the CAS, particularly its Successive and Simultaneous scales, as potential early predictor of reading disability. An exploration of the relationship between patterns of CAS cognitive processes and later reading proficiency also yielded encouraging and interesting results.
- Full Text:
- Date Issued: 2008
- Authors: Hüttenrauch, Maria Eleonore
- Date: 2008
- Subjects: Das-Naglieri Cognitive Assessment System , Intelligence tests for preliterates , Cognition in children , Reading disability
- Language: English
- Type: Thesis , Doctoral , DPhil
- Identifier: vital:9839 , http://hdl.handle.net/10948/965 , Das-Naglieri Cognitive Assessment System , Intelligence tests for preliterates , Cognition in children , Reading disability
- Description: Reading disability, as the most commonly diagnosed learning disability, continues to pose a tenacious problem to teachers, practitioners and researchers. In an effort to understand the causes of reading disability, voluminous research has been undertaken over the past decades to pinpoint its causes or developmental stumbling blocks. One approach, the Planning, Attention, Simultaneous, and Successive processing (PASS) model, combines neuropsychological theory with elements from cognitive psychology. Based on this model, the Cognitive Assessment System (CAS), as well as methods of intervention for reading disability were developed. Although many studies have been conducted that investigated reading disability in terms of PASS cognitive processes, the final version of the CAS and its predictive utility with respect to reading disability has not been explored to date. The present study aimed to investigate the utility of the CAS, administered at the beginning of grade 1, to predict reading proficiency at the end of grade 1. The sample was comprised of 119 “average” (i.e., belonging to the general population) grade 1 students from schools of the Calgary Board of Education (CBE). The Basic Battery of the CAS was administered to the children in the sample at the beginning of grade 1, as well as four reading subtests of the Woodcock-Johnson Tests of Achievement – Third Edition (WJ-III ACH) at the end of grade 1. The WJ-III ACH yielded a cluster score for basic reading and one for reading comprehension. Correlational and regression analyses were used to address the first aim of this study, namely to explore the relationship between students’ scores on the CAS and their later reading proficiency. To this end, the children’s CAS Full Scale scores and WJ-III ACH cluster scores were subjected to a hierarchical regression analysis, whereby age, gender, and - xviii - SES were kept constant by entering them first in the equation. Next, the relationship between students’ PASS scale scores and the CAS subtest scores respectively and scores on the WJ-III ACH Basic Reading and Reading Comprehension Cluster scores was explored by means of stepwise regression analysis. To improve on the generalizability of results, the regression analyses were conducted on a randomly drawn analysis sample consisting of 80% of the sample, and cross-validated on the remaining 20% of the sample. The second aim of the present study was to ascertain whether clusters could be identified on the basis of CAS performance as well as levels of reading proficiency. To this end, the children’s CAS FS scores, PASS scale scores, and CAS subtest scores were subjected to cluster analyses. The investigation of aim 1 yielded some encouraging results, in that it was found that, together with the covariates: • The CAS FS emerged as a moderately strong predictor of both basic reading and reading comprehension; • Successive processing, in particular the Word Series subtest, significantly predicted basic reading skills; • Successive and simultaneous processing, particularly the Nonverbal Matrices and Sentence Repetition subtests, were significant predictors of reading comprehension; The second aim, which explored the relationship between patterns of CAS cognitive processes and their relationship with reading proficiency, yielded: • Two clusters with distinctly different PASS scale scores and with significant differences between their levels of reading proficiency. Higher PASS scales scores, particularly on the Attention and Planning scales, were associated with higher reading proficiency scores. • Four clusters with distinctly different CAS subtest scores that were also associated with distinctly different levels of reading performance. Good - xix - reading proficiency was associated with good CAS performance, whereas weaker reading proficiency was linked to weaker CAS performance. Biographical variables, such as age and SES were found to be related to performance on the CAS and reading proficiency, while gender did not emerge as an important predictor variable. The present study demonstrated the usefulness of the CAS, particularly its Successive and Simultaneous scales, as potential early predictor of reading disability. An exploration of the relationship between patterns of CAS cognitive processes and later reading proficiency also yielded encouraging and interesting results.
- Full Text:
- Date Issued: 2008
The rhizosphere as a bioprocess environment for the bioconversion of hard coal
- Authors: Igbinigie, Eric Egbe
- Date: 2008
- Subjects: Rhizosphere Biotechnology Bermuda grass Coal -- Microbiology Biomass conversion
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:3924 , http://hdl.handle.net/10962/d1003983
- Description: Fundamental processes involved in the microbial degradation of coal and its derivatives have been well investigated and documented over the past two decades. However, limited progress in industrial application has been identified as bottleneck in further active development of the field. The sporadic and unanticipated growth of Cynodon dactylon (Bermuda grass) has been observed on the surface of some coal dumps in the Witbank coal mining area of South Africa. Preliminary investigations showed the formation of a humic soil-like material from the breakdown of hard coal in the root zone of these plants. The potential of this system to contribute to industrial scale bioprocessing of hard coal was investigated. This study involved an investigation of the C. dactylon/coal rhizosphere environment and demonstrated the presence of fungal species with known coal bioconversion capability. Amongst these Neosartorya fischeri was identified and its activity in coal bioconversion was described for the first time. Cynodon dactylon plant roots were also shown to be colonized by mycorrhizal fungi including Glomus, Paraglomus and Gigaspora species. The role of plant photosynthate translocation into the root zone, providing organic carbon supplementation of fungal coal bioconversion was investigated in deep liquid culture with the N. fischeri isolate used as the biocatalyst. Organic acids, sugars and complex organic carbon sources were investigated and it was shown that glutamate provided significant enhancement of bioconversion activity in this system. The performance of N. fischeri in coal bioconversion was compared with Phanaerochaete chrysosporium and Trametes versicolor, both previously described fungal species in the coal bioconversion application. Fourier transform infrared spectroscopy indicated more pronounced oxidation and introduction of nitro groups in the matrix of the humic acid product of coal bioconversion in N. fischeri and P. chrysosporium than for T. versicolor. Macro-elemental analysis of biomass-bound humic acid obtained from the N. fischeri catalyzed reaction showed an increase in the oxygen and nitrogen components and coupled with a reduction in carbon and hydrogen. Pyrolysis gas chromatography mass spectroscopy further supported the proposal that the mechanism of bioconversion involves oxygen and nitrogen insertion into the coal structure. The C. dactylon bituminous hard coal dump environment was simulated in a fixed-bed perfusion column bioreactor in which the contribution of organic supplement by the plant/mycorrhizal component of the system was investigated. The results enabled the proposal of a descriptive model accounting for the performance of the system in which the plant/mycorrhizal component introduces organic substances into the root zone. The non-mycorrhizal fungi utilize the organic carbon supplement in its attack on the coal substrate, breaking it down, and releasing plant nutrients and a soil-like substrate which in turn enables the growth of C. dactylon in this hostile environment. Based on these results, the Stacked Heap Coal Bioreactor concept was developed as a large-scale industrial bioprocess application based on heap-leach mineral processing technology. Field studies have confirmed that bituminous hard coal can be converted to a humic acid rich substrate in a stacked heap system inoculated with mycorrhizal and N. fischeri cultures and planted with C. dactylon.
- Full Text:
- Date Issued: 2008
- Authors: Igbinigie, Eric Egbe
- Date: 2008
- Subjects: Rhizosphere Biotechnology Bermuda grass Coal -- Microbiology Biomass conversion
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:3924 , http://hdl.handle.net/10962/d1003983
- Description: Fundamental processes involved in the microbial degradation of coal and its derivatives have been well investigated and documented over the past two decades. However, limited progress in industrial application has been identified as bottleneck in further active development of the field. The sporadic and unanticipated growth of Cynodon dactylon (Bermuda grass) has been observed on the surface of some coal dumps in the Witbank coal mining area of South Africa. Preliminary investigations showed the formation of a humic soil-like material from the breakdown of hard coal in the root zone of these plants. The potential of this system to contribute to industrial scale bioprocessing of hard coal was investigated. This study involved an investigation of the C. dactylon/coal rhizosphere environment and demonstrated the presence of fungal species with known coal bioconversion capability. Amongst these Neosartorya fischeri was identified and its activity in coal bioconversion was described for the first time. Cynodon dactylon plant roots were also shown to be colonized by mycorrhizal fungi including Glomus, Paraglomus and Gigaspora species. The role of plant photosynthate translocation into the root zone, providing organic carbon supplementation of fungal coal bioconversion was investigated in deep liquid culture with the N. fischeri isolate used as the biocatalyst. Organic acids, sugars and complex organic carbon sources were investigated and it was shown that glutamate provided significant enhancement of bioconversion activity in this system. The performance of N. fischeri in coal bioconversion was compared with Phanaerochaete chrysosporium and Trametes versicolor, both previously described fungal species in the coal bioconversion application. Fourier transform infrared spectroscopy indicated more pronounced oxidation and introduction of nitro groups in the matrix of the humic acid product of coal bioconversion in N. fischeri and P. chrysosporium than for T. versicolor. Macro-elemental analysis of biomass-bound humic acid obtained from the N. fischeri catalyzed reaction showed an increase in the oxygen and nitrogen components and coupled with a reduction in carbon and hydrogen. Pyrolysis gas chromatography mass spectroscopy further supported the proposal that the mechanism of bioconversion involves oxygen and nitrogen insertion into the coal structure. The C. dactylon bituminous hard coal dump environment was simulated in a fixed-bed perfusion column bioreactor in which the contribution of organic supplement by the plant/mycorrhizal component of the system was investigated. The results enabled the proposal of a descriptive model accounting for the performance of the system in which the plant/mycorrhizal component introduces organic substances into the root zone. The non-mycorrhizal fungi utilize the organic carbon supplement in its attack on the coal substrate, breaking it down, and releasing plant nutrients and a soil-like substrate which in turn enables the growth of C. dactylon in this hostile environment. Based on these results, the Stacked Heap Coal Bioreactor concept was developed as a large-scale industrial bioprocess application based on heap-leach mineral processing technology. Field studies have confirmed that bituminous hard coal can be converted to a humic acid rich substrate in a stacked heap system inoculated with mycorrhizal and N. fischeri cultures and planted with C. dactylon.
- Full Text:
- Date Issued: 2008
Interaction between arbuscular mycorrhizal fungi and soil microbial populations in the rhizosphere
- Authors: Ike-Izundu, Nnenna Esther
- Date: 2008
- Subjects: Mycorrhizas , Mycorrhizal fungi , Vesicular-arbuscular mycorrhizas , Soil microbiology , Rhizosphere , Revegetation , Restoration ecology
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:3962 , http://hdl.handle.net/10962/d1004021 , Mycorrhizas , Mycorrhizal fungi , Vesicular-arbuscular mycorrhizas , Soil microbiology , Rhizosphere , Revegetation , Restoration ecology
- Description: This study examined the rehabilitation potential of AM fungi with organic and inorganic fertilisers under pot and field trial conditions as well as their interaction with rhizospheric organisms and specific functional groups. In addition, the study highlighted the effects of land-use management on AM fungal populations in soil and the mycorrhizal status of some selected plants from one of the study sites. The study focussed on two sites that differ in operational activities and these included a mined area that was to be rehabilitated and a commercial farming site. A pot trial was conducted using an overburdened soil resulting from kaolin clay mining. Pots were seeded with Cynodon dactylon and treated with either Organic Tea or NPK (3:1:5) fertiliser, with or without AM fungal inoculum. The compatibility of these fertilisers with AM fungi was assessed by plant growth and percentage root colonisation. Maximum shoot height and plant biomass were observed at the 28th week with NPK (3:1:5) fertiliser supporting mycorrhizal colonisation by 80%. The result indicated the potential of AM fungi to be used in rehabilitation with minimal phosphate fertiliser. Similarly, a field trial was set-up using 17 x 17 m[superscript 2] plots in the mining site that were treated with the same organic and inorganic fertilisers as well as with AM fungal inoculum in different combinations. The interaction between AM fungi and soil microbial population was determined using culture dependent and culture independent techniques. The culture dependent technique involved the use of soil dilution and plating on general purpose and selective media. The result showed that there was no change in the total culturable bacterial number in the untreated and AM fungal treated plots, while a change in species composition was observed in the functional groups. Different functional groups identified included nitrogen fixing bacteria, pseudomonads, actinomycetes, phosphate solubilisers and the fungal counterparts. Gram-positive bacteria were observed as the predominant phenotypic type, while nitrogen fixers and actinomycetes were the predominant functional groups. Species identified from each functional group were Pseudomonas fulva, Bacillus megaterium, Streptomyces and actinomycetales bacteria. Meanwhile, fungi such as Ampelomyces, Fusarium, Penicillium, Aspergillus, Cephalosporium and Exserohilium were identified morphologically and molecularly. Furthermore, the mining site had a significantly higher bacterial number than the farming site thereby indicating the effects of land-use management on culturable bacterial numbers. The culture independent technique was carried out by cloning of the bacterial 16S rDNA and sequencing. Identified clones were Bradyrhizobium, Propionibacterium and Sporichthya. A cladogram constructed with the nucleotides sequences of identified functional species, clones and closely related nucleotide sequences from the Genbank indicated that nucleotide sequences differed in terms of the method used. The activity and establishment of the introduced AM fungal population was determined by spore enumeration, infectivity assay, percentage root colonisation and assessment of glomalin concentrations. The results indicated that the two land use types affected AM fungal populations. However, the establishment of AM fungi in the farming site was more successful than in the mining site as indicated by the higher infectivity pontential. Selected host plants, which were collected around the mine area, were observed to be mainly colonised by AM fungi and these were identified as Pentzia incana, Elytropappus rhinocerotis, Euphorbia meloformis, Selago corymbosa, Albuca canadensis and Helichrysum rosum. These plant species were able to thrive under harsh environmental conditions, thereby indicating their potential use as rehabilitation host plants. Generally, the findings of this study has provided an insight into the interaction between arbuscular mycorrhizal fungi and other soil microorganisms in two fields with differing land use management practices.
- Full Text:
- Date Issued: 2008
- Authors: Ike-Izundu, Nnenna Esther
- Date: 2008
- Subjects: Mycorrhizas , Mycorrhizal fungi , Vesicular-arbuscular mycorrhizas , Soil microbiology , Rhizosphere , Revegetation , Restoration ecology
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:3962 , http://hdl.handle.net/10962/d1004021 , Mycorrhizas , Mycorrhizal fungi , Vesicular-arbuscular mycorrhizas , Soil microbiology , Rhizosphere , Revegetation , Restoration ecology
- Description: This study examined the rehabilitation potential of AM fungi with organic and inorganic fertilisers under pot and field trial conditions as well as their interaction with rhizospheric organisms and specific functional groups. In addition, the study highlighted the effects of land-use management on AM fungal populations in soil and the mycorrhizal status of some selected plants from one of the study sites. The study focussed on two sites that differ in operational activities and these included a mined area that was to be rehabilitated and a commercial farming site. A pot trial was conducted using an overburdened soil resulting from kaolin clay mining. Pots were seeded with Cynodon dactylon and treated with either Organic Tea or NPK (3:1:5) fertiliser, with or without AM fungal inoculum. The compatibility of these fertilisers with AM fungi was assessed by plant growth and percentage root colonisation. Maximum shoot height and plant biomass were observed at the 28th week with NPK (3:1:5) fertiliser supporting mycorrhizal colonisation by 80%. The result indicated the potential of AM fungi to be used in rehabilitation with minimal phosphate fertiliser. Similarly, a field trial was set-up using 17 x 17 m[superscript 2] plots in the mining site that were treated with the same organic and inorganic fertilisers as well as with AM fungal inoculum in different combinations. The interaction between AM fungi and soil microbial population was determined using culture dependent and culture independent techniques. The culture dependent technique involved the use of soil dilution and plating on general purpose and selective media. The result showed that there was no change in the total culturable bacterial number in the untreated and AM fungal treated plots, while a change in species composition was observed in the functional groups. Different functional groups identified included nitrogen fixing bacteria, pseudomonads, actinomycetes, phosphate solubilisers and the fungal counterparts. Gram-positive bacteria were observed as the predominant phenotypic type, while nitrogen fixers and actinomycetes were the predominant functional groups. Species identified from each functional group were Pseudomonas fulva, Bacillus megaterium, Streptomyces and actinomycetales bacteria. Meanwhile, fungi such as Ampelomyces, Fusarium, Penicillium, Aspergillus, Cephalosporium and Exserohilium were identified morphologically and molecularly. Furthermore, the mining site had a significantly higher bacterial number than the farming site thereby indicating the effects of land-use management on culturable bacterial numbers. The culture independent technique was carried out by cloning of the bacterial 16S rDNA and sequencing. Identified clones were Bradyrhizobium, Propionibacterium and Sporichthya. A cladogram constructed with the nucleotides sequences of identified functional species, clones and closely related nucleotide sequences from the Genbank indicated that nucleotide sequences differed in terms of the method used. The activity and establishment of the introduced AM fungal population was determined by spore enumeration, infectivity assay, percentage root colonisation and assessment of glomalin concentrations. The results indicated that the two land use types affected AM fungal populations. However, the establishment of AM fungi in the farming site was more successful than in the mining site as indicated by the higher infectivity pontential. Selected host plants, which were collected around the mine area, were observed to be mainly colonised by AM fungi and these were identified as Pentzia incana, Elytropappus rhinocerotis, Euphorbia meloformis, Selago corymbosa, Albuca canadensis and Helichrysum rosum. These plant species were able to thrive under harsh environmental conditions, thereby indicating their potential use as rehabilitation host plants. Generally, the findings of this study has provided an insight into the interaction between arbuscular mycorrhizal fungi and other soil microorganisms in two fields with differing land use management practices.
- Full Text:
- Date Issued: 2008
Selective para-funtionalization of phenol
- Authors: Indurkar, Jayant R
- Date: 2008
- Subjects: Phenol
- Language: English
- Type: Thesis , Doctoral , DTech
- Identifier: vital:10402 , http://hdl.handle.net/10948/710 , Phenol
- Description: In previous work done in our laboratories, a method was discovered to produce phenolic mono-ethers from 4-hydroxyacetophenone and other 4-hydroxyketones by treating with ammonium peroxy-disulfate in an alcohol as a reaction solvent and in the presence of concentrated sulphuric acid or other strong protonic acids. Since this method of producing 4-alkoxyphenol ethers provides a very convenient way to modify hydroquinone and substituted hydroquinones to produce a variety of phenol mono-ethers, it was of interest to study the general scope of this reaction, including a more detailed investigation of the reaction mechanism. In previous studies, it was suggested that interaction between the aromatic pi-system of hydroquinone and the cyclohexa-2,5-diene structure of benzoquinone plays a significant role during the reaction. It was therefore of interest to investigate whether other compounds that are also capable of forming the cyclohexa-2,5-diene structure, will interact in a manner analogous to the hydroquinone/benzoquinone couple. Two specific compounds were selected for this purpose, namely 4-nitrosophenol and 4- (diphenylmethylene)cyclohexa-2,5-dien-1-one . The scope of etherification reactions of hydroquinone-benzoquinone or hydroquinone/benzoquinone like substrates such as 4-nitrosophenol and 4- (diphenylmethylene)cyclohexa-2,5-dien-1-one in the presence of acid catalyst and alcohols was investigated. These studies showed that hydroquinone, 4- nitrosophenol and 4-(diphenylmethylene)cyclohexa-2,5-dien-1-one successfully affords the phenolic ethers in good to excellent yield. For example, quantitative yield of 4-methoxyphenol could be obtained from a 1:1 mixture of hydroquinone and benzoquinone at the reflux temperature of methanol. In order to study the reaction mechanism, the cross-over reaction between tertbutylhydroquinone and benzoquinone (or hydroquinone and tertbutylbenzoquinone) was studied in detail. The results of these cross-over reactions were used to propose a mechanistic pathway that could explain the requirement for pi-interaction between the hydroquinone and benzoquinone molecules, the role of the acid catalyst, as well as the relative rates of hydroquinone and benzoquinone consumption during these reactions. The mechanism was also capable of explaining all the reaction products observed during these reactions. The work was then extended to reactions of 4-nitrosophenol and 4- (diphenylmethylene)cyclohexa-2,5-dien-1-one with methanol in the presence of either hydroquinone or benzoquinone. The results of these investigations strongly suggest the presence of similar interactions between these molecules that also influence the outcome of the reactions. The exploitation of pi-interactions between two molecules of these types investigated during this work opens an interesting field of chemistry. Clearly, the level of understanding developed during this work is only beginning to address this interesting field of chemistry and much work will need to be done to gain a fuller understanding of the chemistry involved as well as the potential synthetic value of these interactions.
- Full Text:
- Date Issued: 2008
- Authors: Indurkar, Jayant R
- Date: 2008
- Subjects: Phenol
- Language: English
- Type: Thesis , Doctoral , DTech
- Identifier: vital:10402 , http://hdl.handle.net/10948/710 , Phenol
- Description: In previous work done in our laboratories, a method was discovered to produce phenolic mono-ethers from 4-hydroxyacetophenone and other 4-hydroxyketones by treating with ammonium peroxy-disulfate in an alcohol as a reaction solvent and in the presence of concentrated sulphuric acid or other strong protonic acids. Since this method of producing 4-alkoxyphenol ethers provides a very convenient way to modify hydroquinone and substituted hydroquinones to produce a variety of phenol mono-ethers, it was of interest to study the general scope of this reaction, including a more detailed investigation of the reaction mechanism. In previous studies, it was suggested that interaction between the aromatic pi-system of hydroquinone and the cyclohexa-2,5-diene structure of benzoquinone plays a significant role during the reaction. It was therefore of interest to investigate whether other compounds that are also capable of forming the cyclohexa-2,5-diene structure, will interact in a manner analogous to the hydroquinone/benzoquinone couple. Two specific compounds were selected for this purpose, namely 4-nitrosophenol and 4- (diphenylmethylene)cyclohexa-2,5-dien-1-one . The scope of etherification reactions of hydroquinone-benzoquinone or hydroquinone/benzoquinone like substrates such as 4-nitrosophenol and 4- (diphenylmethylene)cyclohexa-2,5-dien-1-one in the presence of acid catalyst and alcohols was investigated. These studies showed that hydroquinone, 4- nitrosophenol and 4-(diphenylmethylene)cyclohexa-2,5-dien-1-one successfully affords the phenolic ethers in good to excellent yield. For example, quantitative yield of 4-methoxyphenol could be obtained from a 1:1 mixture of hydroquinone and benzoquinone at the reflux temperature of methanol. In order to study the reaction mechanism, the cross-over reaction between tertbutylhydroquinone and benzoquinone (or hydroquinone and tertbutylbenzoquinone) was studied in detail. The results of these cross-over reactions were used to propose a mechanistic pathway that could explain the requirement for pi-interaction between the hydroquinone and benzoquinone molecules, the role of the acid catalyst, as well as the relative rates of hydroquinone and benzoquinone consumption during these reactions. The mechanism was also capable of explaining all the reaction products observed during these reactions. The work was then extended to reactions of 4-nitrosophenol and 4- (diphenylmethylene)cyclohexa-2,5-dien-1-one with methanol in the presence of either hydroquinone or benzoquinone. The results of these investigations strongly suggest the presence of similar interactions between these molecules that also influence the outcome of the reactions. The exploitation of pi-interactions between two molecules of these types investigated during this work opens an interesting field of chemistry. Clearly, the level of understanding developed during this work is only beginning to address this interesting field of chemistry and much work will need to be done to gain a fuller understanding of the chemistry involved as well as the potential synthetic value of these interactions.
- Full Text:
- Date Issued: 2008
Diet and feeding effects of introduced giraffe in the Eastern Cape
- Authors: Jacobs, Evert Philippus
- Date: 2008
- Subjects: Giraffe -- Food -- South Africa -- Eastern Cape , Giraffe -- Ecology -- South Africa -- Eastern Cape , Animal-plant relationships -- South Africa -- Eastern Cape , Introduced mammals -- Ecology -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:10703 , http://hdl.handle.net/10948/964 , Giraffe -- Food -- South Africa -- Eastern Cape , Giraffe -- Ecology -- South Africa -- Eastern Cape , Animal-plant relationships -- South Africa -- Eastern Cape , Introduced mammals -- Ecology -- South Africa -- Eastern Cape
- Description: This study presents the results of a study on introduced giraffe diet and feeding effects within the Eastern Cape Province of South Africa. Five sites were selected over a moisture gradient from the mesic east to the arid west of the Eastern Cape to describe giraffe diet and provide baseline data for feeding effect experiments. At each site faecal samples were collected seasonally and diet composition determined by microhistological analysis. Plant species availability was measured using the point intersect method in order to compare plant availability to plant consumption to determine diet preferences. Giraffe diet across the sites showed a unimodal response to rainfall by utilising fewer species in drier areas where plant availability is low and increasing the number of species consumed as the rainfall increases. In higher rainfall areas, giraffe reduced the number of plant species fed upon because of the high availability of important species that reduces the need for a varied diet. Across all sites, plant availability was dominated by woody plant species (more than 90 percent at each site). A total of 57 plants species were recorded as being eaten across the five sites. Several PDI (Principle Diet Items) plant species (Acacia karroo, Schotia afra, Pappea capensis and Euclea undulata) were eaten across sites. Over all the sites, significantly preferred species were Asparagus striatus, Schotia latifolia, Asparagus suaveolens, Commelina benghalensis, Viscum rotundifolium, and Acacia cyclops. Acacia karroo, Schotia afra, Pappea capensis, Rhus crenata, A. tetracantha, and Grewia robusta were utilised in proportion to their availability. Euclea undulata, Rhus longispina and Putterlickia pyracantha were avoided. Feeding effects were tested by erecting exclosures around trees, covering one half of each tree. Ten trees were selected for these manipulative experiments which ran from September 2003 to February 2005. The number of branches, number of leaves, branch orders, branch diameter, branch length, leaf length and leaf width were measured for ten samples per side (enclosed vs. exposed) and analysed using a Wilcoxon matched pairs test and tested for effect size using Cohen’s d. Although no significant differences were detected between the sides measured, the effect size indicated differences in all measurements between sides ranging from low to moderate. Leaf length was greater on the outside of exclosures and showed a moderate difference between the sides in terms of the d-value with the p-value (0.059) tending towards significance. Although leaf width was higher on the inside of exclosures, it only showed a moderate difference for d with no statistical significance. Leaf area was higher on the inside of exclosures and tended to significance (p = 0.059) and similarly the d value indicated moderate differences between the sides in terms of effect size. Similarly branch length was higher on the inside of exclosures although not significantly, the p-value (0.07) approached significance. The effect size for branch length also showed a moderate difference between the sides. The number of branches and the number of leaves showed no statistical differences between the sides although the p-value (0.059) for the number of branches, as well as number of leaves (p = 0.07) approached significance. For both these variables, effect size showed a moderate difference. Giraffe showed diversity in their diet selection across sites but mainly fed upon available species. Some preferred species were however less available and this preference could possibly result in increased pressure on the selected plant species Exclosure experiments showed no significant differences in leaf and shoot characteristics although all measurements showed differences in terms of effect size meriting further investigation. It is concluded that giraffe impact on sites may be reduced if populations are properly managed however, high densities of giraffe could lead to similar vegetation impacts as observed in other areas where giraffe have been introduced and potentially change vegetation structure and plant community composition.
- Full Text:
- Date Issued: 2008
- Authors: Jacobs, Evert Philippus
- Date: 2008
- Subjects: Giraffe -- Food -- South Africa -- Eastern Cape , Giraffe -- Ecology -- South Africa -- Eastern Cape , Animal-plant relationships -- South Africa -- Eastern Cape , Introduced mammals -- Ecology -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:10703 , http://hdl.handle.net/10948/964 , Giraffe -- Food -- South Africa -- Eastern Cape , Giraffe -- Ecology -- South Africa -- Eastern Cape , Animal-plant relationships -- South Africa -- Eastern Cape , Introduced mammals -- Ecology -- South Africa -- Eastern Cape
- Description: This study presents the results of a study on introduced giraffe diet and feeding effects within the Eastern Cape Province of South Africa. Five sites were selected over a moisture gradient from the mesic east to the arid west of the Eastern Cape to describe giraffe diet and provide baseline data for feeding effect experiments. At each site faecal samples were collected seasonally and diet composition determined by microhistological analysis. Plant species availability was measured using the point intersect method in order to compare plant availability to plant consumption to determine diet preferences. Giraffe diet across the sites showed a unimodal response to rainfall by utilising fewer species in drier areas where plant availability is low and increasing the number of species consumed as the rainfall increases. In higher rainfall areas, giraffe reduced the number of plant species fed upon because of the high availability of important species that reduces the need for a varied diet. Across all sites, plant availability was dominated by woody plant species (more than 90 percent at each site). A total of 57 plants species were recorded as being eaten across the five sites. Several PDI (Principle Diet Items) plant species (Acacia karroo, Schotia afra, Pappea capensis and Euclea undulata) were eaten across sites. Over all the sites, significantly preferred species were Asparagus striatus, Schotia latifolia, Asparagus suaveolens, Commelina benghalensis, Viscum rotundifolium, and Acacia cyclops. Acacia karroo, Schotia afra, Pappea capensis, Rhus crenata, A. tetracantha, and Grewia robusta were utilised in proportion to their availability. Euclea undulata, Rhus longispina and Putterlickia pyracantha were avoided. Feeding effects were tested by erecting exclosures around trees, covering one half of each tree. Ten trees were selected for these manipulative experiments which ran from September 2003 to February 2005. The number of branches, number of leaves, branch orders, branch diameter, branch length, leaf length and leaf width were measured for ten samples per side (enclosed vs. exposed) and analysed using a Wilcoxon matched pairs test and tested for effect size using Cohen’s d. Although no significant differences were detected between the sides measured, the effect size indicated differences in all measurements between sides ranging from low to moderate. Leaf length was greater on the outside of exclosures and showed a moderate difference between the sides in terms of the d-value with the p-value (0.059) tending towards significance. Although leaf width was higher on the inside of exclosures, it only showed a moderate difference for d with no statistical significance. Leaf area was higher on the inside of exclosures and tended to significance (p = 0.059) and similarly the d value indicated moderate differences between the sides in terms of effect size. Similarly branch length was higher on the inside of exclosures although not significantly, the p-value (0.07) approached significance. The effect size for branch length also showed a moderate difference between the sides. The number of branches and the number of leaves showed no statistical differences between the sides although the p-value (0.059) for the number of branches, as well as number of leaves (p = 0.07) approached significance. For both these variables, effect size showed a moderate difference. Giraffe showed diversity in their diet selection across sites but mainly fed upon available species. Some preferred species were however less available and this preference could possibly result in increased pressure on the selected plant species Exclosure experiments showed no significant differences in leaf and shoot characteristics although all measurements showed differences in terms of effect size meriting further investigation. It is concluded that giraffe impact on sites may be reduced if populations are properly managed however, high densities of giraffe could lead to similar vegetation impacts as observed in other areas where giraffe have been introduced and potentially change vegetation structure and plant community composition.
- Full Text:
- Date Issued: 2008
The role of the school management in addressing the problem of drug abuse in the northern areas of Port Elizabeth
- Authors: Jacobs, Lee-Ann
- Date: 2008
- Subjects: High school students -- Substance use -- South Africa -- Port Elizabeth , School management and organization -- South Africa -- Port Elizabeth
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:9545 , http://hdl.handle.net/10948/675 , High school students -- Substance use -- South Africa -- Port Elizabeth , School management and organization -- South Africa -- Port Elizabeth
- Description: Drug abuse by teenagers is a problem encountered by educators in South African schools. This study focuses on the reasons for, and the consequences of teenage drug abuse in one school in the Northern Areas of Port Elizabeth. The main aim of this study was to formulate strategies which school managers can use to alleviate the problem of drug abuse among learners. A naturalistic approach was followed to conduct qualitative research. The research design used is a case study. Data-collection techniques consisted of semi-structured and unstructured interviews, observations and questionnaires. Respondents consisted of 150 learners, 5 parents, 10 educators from the school, 2 social workers and 1 auxiliary social worker, 2 priests involved in Youth Ministry, 1 adult involved in running a drug rehabilitation centre, and 1 ex-addict who is involved in arranging drug awareness campaigns and rehabilitation programs. This study found family aspects and family dynamics, personal aspects and the self-concept of the teenager, and societal or environmental aspects to be the main reasons for teenage drug abuse. Drugs have an adverse effect on the community within which the abuse is occurring. It also has a negative effect on the health, psychological state, behaviour and the family of the teenager. Strategies to alleviate the problem emphasise the role which the school can play in terms of drug education for educators, learners and parents; the role of the Government in allocating additional funds for drug education; the role which the church can play in terms of drug education and providing opportunities for positive interactions with peers; and the role which the media can play in influencing the decisions of teenagers.
- Full Text:
- Date Issued: 2008
- Authors: Jacobs, Lee-Ann
- Date: 2008
- Subjects: High school students -- Substance use -- South Africa -- Port Elizabeth , School management and organization -- South Africa -- Port Elizabeth
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:9545 , http://hdl.handle.net/10948/675 , High school students -- Substance use -- South Africa -- Port Elizabeth , School management and organization -- South Africa -- Port Elizabeth
- Description: Drug abuse by teenagers is a problem encountered by educators in South African schools. This study focuses on the reasons for, and the consequences of teenage drug abuse in one school in the Northern Areas of Port Elizabeth. The main aim of this study was to formulate strategies which school managers can use to alleviate the problem of drug abuse among learners. A naturalistic approach was followed to conduct qualitative research. The research design used is a case study. Data-collection techniques consisted of semi-structured and unstructured interviews, observations and questionnaires. Respondents consisted of 150 learners, 5 parents, 10 educators from the school, 2 social workers and 1 auxiliary social worker, 2 priests involved in Youth Ministry, 1 adult involved in running a drug rehabilitation centre, and 1 ex-addict who is involved in arranging drug awareness campaigns and rehabilitation programs. This study found family aspects and family dynamics, personal aspects and the self-concept of the teenager, and societal or environmental aspects to be the main reasons for teenage drug abuse. Drugs have an adverse effect on the community within which the abuse is occurring. It also has a negative effect on the health, psychological state, behaviour and the family of the teenager. Strategies to alleviate the problem emphasise the role which the school can play in terms of drug education for educators, learners and parents; the role of the Government in allocating additional funds for drug education; the role which the church can play in terms of drug education and providing opportunities for positive interactions with peers; and the role which the media can play in influencing the decisions of teenagers.
- Full Text:
- Date Issued: 2008
Faktore wat die oorlewing van volstruiskuikens (Struthio Camelus) verhoog
- Authors: Janse Van Vuuren, Maryke
- Date: 2008
- Subjects: Ostrich farming -- South Africa , Ostriches -- Breeding -- South Africa
- Language: Afrikaans
- Type: Thesis , Masters , MTech
- Identifier: vital:10588 , http://hdl.handle.net/10948/848 , Ostrich farming -- South Africa , Ostriches -- Breeding -- South Africa
- Description: Hierdie verhandeling is ‘n samestelling van verskeie studies, elk opgeskryf in die formaat en styl soos vereis deur die Suid-Afrikaanse Vereeniging vir Diereproduksie (South African Society of Animal Science). Hoofstuk 1 is ‘n literatuurstudie bestaande uit ‘n algemene inleiding wat agtergrond oor die studie verskaf en sluit die probleemstelling in, naamlik die swak oorlewing van volstruiskuikens wat onder kunsmatige toestande grootgemaak word. Hoofstukke 2, 3, 4 en 5 bestaan uit die eerste vier studies, waartydens sekere bestuurs-aspekte, wat moontlik oorlewing van volstruiskuikens kan verbeter (nl: populasiedigtheid, tipe vloer-oppervlak, die aanwending van broeipare en die aanwending van peetouers), ondersoek is. Hoofstukke 6, 7, 8 & 9 handel oor studies wat gerig is om voeding meer aanloklik te maak vir volstruiskuikens teneinde voedselinname te stimuleer en sodoende produksie en oorlewing te verbeter (nl: verskaffing van groenvoer, geur van voer, kleur van voer en beligting van voer). Die laaste hoofstuk bestaan uit ‘n algemene gevolgtrekking en aanbevelings. Alhoewel daar gepoog is om herhaling in hoofstukke te beperk, was dit onmoontlik om herhaling van sekere gedeeltes van hoofstukke te voorkom.
- Full Text:
- Date Issued: 2008
- Authors: Janse Van Vuuren, Maryke
- Date: 2008
- Subjects: Ostrich farming -- South Africa , Ostriches -- Breeding -- South Africa
- Language: Afrikaans
- Type: Thesis , Masters , MTech
- Identifier: vital:10588 , http://hdl.handle.net/10948/848 , Ostrich farming -- South Africa , Ostriches -- Breeding -- South Africa
- Description: Hierdie verhandeling is ‘n samestelling van verskeie studies, elk opgeskryf in die formaat en styl soos vereis deur die Suid-Afrikaanse Vereeniging vir Diereproduksie (South African Society of Animal Science). Hoofstuk 1 is ‘n literatuurstudie bestaande uit ‘n algemene inleiding wat agtergrond oor die studie verskaf en sluit die probleemstelling in, naamlik die swak oorlewing van volstruiskuikens wat onder kunsmatige toestande grootgemaak word. Hoofstukke 2, 3, 4 en 5 bestaan uit die eerste vier studies, waartydens sekere bestuurs-aspekte, wat moontlik oorlewing van volstruiskuikens kan verbeter (nl: populasiedigtheid, tipe vloer-oppervlak, die aanwending van broeipare en die aanwending van peetouers), ondersoek is. Hoofstukke 6, 7, 8 & 9 handel oor studies wat gerig is om voeding meer aanloklik te maak vir volstruiskuikens teneinde voedselinname te stimuleer en sodoende produksie en oorlewing te verbeter (nl: verskaffing van groenvoer, geur van voer, kleur van voer en beligting van voer). Die laaste hoofstuk bestaan uit ‘n algemene gevolgtrekking en aanbevelings. Alhoewel daar gepoog is om herhaling in hoofstukke te beperk, was dit onmoontlik om herhaling van sekere gedeeltes van hoofstukke te voorkom.
- Full Text:
- Date Issued: 2008
Inter-level health service referral of women in labour
- Authors: Jantjes, Louisa
- Date: 2008
- Subjects: Childbirth -- South Africa , Medical referrals -- South Africa , Midwives -- South Africa , Labor (Obstetrics) -- Complications
- Language: English
- Type: Thesis , Doctoral , DCur
- Identifier: vital:10010 , http://hdl.handle.net/10948/986 , Childbirth -- South Africa , Medical referrals -- South Africa , Midwives -- South Africa , Labor (Obstetrics) -- Complications
- Description: Although it is considered an everyday occurrence, childbirth is nonetheless an important and dramatic experience in the life of every woman. Childbirth, a normal physiological state in the life of a woman, can be an awe-inspiring and exciting experience, but sometimes disconcerting experiences may also occur. Women sometimes see labour as the end to a long drawn out process following pregnancy and therefore attribute great significance to all occurrences during labour. When complications occur in a usually uncomplicated process of labour, the health care provider must be able to make quick and effective management decisions and implement appropriate interventions. This may include the referral of women in labour to a level of care where complications can be dealt with more effectively, thereby ensuring the best maternal and neonatal outcomes. Patient referral is regarded as a fundamental component of the health care system therefore a well functioning system should ensure that patients are treated in the appropriate manner at the appropriate place at the lowest possible cost to the health system. The goal of this research study was to explore and describe the inter-level health service referral of women in labour by midwives, in order to design guidelines for midwives and other relevant health care providers involved in inter-level health service referral of women in labour in the South African public health care sector. The research design used for this study is a combination of qualitative and quantitative approaches. The paradigmatic perspective of this study was based on the World Health Organization’s Health for All Model. Appropriate data collection and analysis strategies were used for the different stages of the study. Data collection commenced only after permission to conduct the research had been obtained from relevant authorities and University of Port Elizabeth and the Nelson Mandela Metropolitan University structures. Informed consent was obtained from participants included in the study. In stage 1 of this research project, a profile of midwives at lower level maternity care centres was compiled and the perceptions and experiences of midwives working at lower level maternity services, who are responsible for inter-level health referrals of women in labour, were described. Stage 2 described, by means of analysis of maternity case records, aspects of the inter-level referral of women in labour including the profiles of women admitted to midwife obstetric units (MOUs) who are v referred to higher levels of care. Of significance in this study is the appropriateness of midwifery referrals and the maternity care implemented by health care providers during inter-level health service referral of women in labour. In stage 3 clinical guidelines for midwives and other relevant maternity care providers, to assist them in the inter-level health service referral of women in labour, were developed. Findings from stage 1 of this research study revealed that midwives were generally well qualified and sufficiently experienced in the management of women in labour who need referral. Disconcerting findings relating to human and material resource shortages were discovered; these included major problems with patient transportation and difficulties with communication relating to inter-level health service referral of women. These shortages adversely affected midwives’ ability to efficiently care for women during the inter-level health service referral of women in labour in the research area. Stage 2 of the study yielded results of questionable standards of care to women and infants included in the study. A further disturbing finding from the study is the poor state of record keeping. The development of the provisional guidelines in stage 3 of the study was informed by the four main themes identified from the research findings. Before embarking on guideline development, the researcher familiarized herself with theory related to the clinical guidelines. These included clarifying the concept ‘clinical guidelines’, justifying the need for developing clinical guidelines as well as giving consideration to concerns about clinical guidelines. The research findings as well as literature related to these findings informed the researcher on the development of the guidelines. Provisional guidelines were therefore developed on responsibilities of role players in inter-level health service referral of women in labour at first level of referral, namely the midwife obstetric units, transport personnel and maternity care providers at the referral hospital. Steps were taken throughout the study to adhere to ethical standards of research. The researcher will ensure that the research report is available to all health authorities involved, the participants included in the study and the health care providers who may benefit from the research findings.
- Full Text:
- Date Issued: 2008
- Authors: Jantjes, Louisa
- Date: 2008
- Subjects: Childbirth -- South Africa , Medical referrals -- South Africa , Midwives -- South Africa , Labor (Obstetrics) -- Complications
- Language: English
- Type: Thesis , Doctoral , DCur
- Identifier: vital:10010 , http://hdl.handle.net/10948/986 , Childbirth -- South Africa , Medical referrals -- South Africa , Midwives -- South Africa , Labor (Obstetrics) -- Complications
- Description: Although it is considered an everyday occurrence, childbirth is nonetheless an important and dramatic experience in the life of every woman. Childbirth, a normal physiological state in the life of a woman, can be an awe-inspiring and exciting experience, but sometimes disconcerting experiences may also occur. Women sometimes see labour as the end to a long drawn out process following pregnancy and therefore attribute great significance to all occurrences during labour. When complications occur in a usually uncomplicated process of labour, the health care provider must be able to make quick and effective management decisions and implement appropriate interventions. This may include the referral of women in labour to a level of care where complications can be dealt with more effectively, thereby ensuring the best maternal and neonatal outcomes. Patient referral is regarded as a fundamental component of the health care system therefore a well functioning system should ensure that patients are treated in the appropriate manner at the appropriate place at the lowest possible cost to the health system. The goal of this research study was to explore and describe the inter-level health service referral of women in labour by midwives, in order to design guidelines for midwives and other relevant health care providers involved in inter-level health service referral of women in labour in the South African public health care sector. The research design used for this study is a combination of qualitative and quantitative approaches. The paradigmatic perspective of this study was based on the World Health Organization’s Health for All Model. Appropriate data collection and analysis strategies were used for the different stages of the study. Data collection commenced only after permission to conduct the research had been obtained from relevant authorities and University of Port Elizabeth and the Nelson Mandela Metropolitan University structures. Informed consent was obtained from participants included in the study. In stage 1 of this research project, a profile of midwives at lower level maternity care centres was compiled and the perceptions and experiences of midwives working at lower level maternity services, who are responsible for inter-level health referrals of women in labour, were described. Stage 2 described, by means of analysis of maternity case records, aspects of the inter-level referral of women in labour including the profiles of women admitted to midwife obstetric units (MOUs) who are v referred to higher levels of care. Of significance in this study is the appropriateness of midwifery referrals and the maternity care implemented by health care providers during inter-level health service referral of women in labour. In stage 3 clinical guidelines for midwives and other relevant maternity care providers, to assist them in the inter-level health service referral of women in labour, were developed. Findings from stage 1 of this research study revealed that midwives were generally well qualified and sufficiently experienced in the management of women in labour who need referral. Disconcerting findings relating to human and material resource shortages were discovered; these included major problems with patient transportation and difficulties with communication relating to inter-level health service referral of women. These shortages adversely affected midwives’ ability to efficiently care for women during the inter-level health service referral of women in labour in the research area. Stage 2 of the study yielded results of questionable standards of care to women and infants included in the study. A further disturbing finding from the study is the poor state of record keeping. The development of the provisional guidelines in stage 3 of the study was informed by the four main themes identified from the research findings. Before embarking on guideline development, the researcher familiarized herself with theory related to the clinical guidelines. These included clarifying the concept ‘clinical guidelines’, justifying the need for developing clinical guidelines as well as giving consideration to concerns about clinical guidelines. The research findings as well as literature related to these findings informed the researcher on the development of the guidelines. Provisional guidelines were therefore developed on responsibilities of role players in inter-level health service referral of women in labour at first level of referral, namely the midwife obstetric units, transport personnel and maternity care providers at the referral hospital. Steps were taken throughout the study to adhere to ethical standards of research. The researcher will ensure that the research report is available to all health authorities involved, the participants included in the study and the health care providers who may benefit from the research findings.
- Full Text:
- Date Issued: 2008