"Complexes of carbohydrates with magnesium-ions" : "the isolation of an oligosaccharide containing L-galactose from the polysaccharide of Aeodes orbitosa" : "horizontal cellulose colum chromatography of sugars"
- Authors: Van der Linde, Michael John
- Date: 1974
- Subjects: Magenesium , Ions , Carbohydrates , Oligosaccharides , Polysaccharides , Chromatographic analysis
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:4504 , http://hdl.handle.net/10962/d1013282
- Description: Sugar complexes with anions and cations are reviewed. Evidence is presented for the formation of a complex of stoichiometry 1:1 in aqueous solution between methyl-α-Dglucopyranoside and magnesium perchlorate. The complex may be detected by the method of continuous variations. Measurements of changes in the proton chemical shifts of the glucoside in dauterium oxide, indicate that the complex is probably formed between the vicinal hydroxyl groups at C-2 and C-3 of the pyranoside ring and the hydrated cation. At elevation temperatures there is evidence for the presence of a complex of stoichiometry 2:1. Experiments conducted on cellulose indicate the possible formation of cellulose - magnesium-ion complexes . These complexes provide an explanation for the "protective action" of mEgnesium compounds on the cellulose portion of pulp during alkali-oxygen bleaching.
- Full Text:
- Date Issued: 1974
- Authors: Van der Linde, Michael John
- Date: 1974
- Subjects: Magenesium , Ions , Carbohydrates , Oligosaccharides , Polysaccharides , Chromatographic analysis
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:4504 , http://hdl.handle.net/10962/d1013282
- Description: Sugar complexes with anions and cations are reviewed. Evidence is presented for the formation of a complex of stoichiometry 1:1 in aqueous solution between methyl-α-Dglucopyranoside and magnesium perchlorate. The complex may be detected by the method of continuous variations. Measurements of changes in the proton chemical shifts of the glucoside in dauterium oxide, indicate that the complex is probably formed between the vicinal hydroxyl groups at C-2 and C-3 of the pyranoside ring and the hydrated cation. At elevation temperatures there is evidence for the presence of a complex of stoichiometry 2:1. Experiments conducted on cellulose indicate the possible formation of cellulose - magnesium-ion complexes . These complexes provide an explanation for the "protective action" of mEgnesium compounds on the cellulose portion of pulp during alkali-oxygen bleaching.
- Full Text:
- Date Issued: 1974
"Too tired to speak?": investigating the reception of Radio Grahamstown's Lunchtime Live show as a means of linking local communities to power
- Authors: Tsarwe, Stanley Zvinaiye
- Date: 2011
- Subjects: Community radio -- South Africa -- Grahamstown Radio broadcasting -- South Africa -- Grahamstown Radio journalism -- South Africa -- Grahamstown Mass media -- Political aspects -- South Africa -- Grahamstown Grahamstown (South Africa) -- Economic conditions -- 21st century Grahamstown (South Africa) -- Social conditions -- 21st century Civil society -- South Africa -- Grahamstown Political participation -- South Africa -- Grahamstown
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3488 , http://hdl.handle.net/10962/d1002943
- Description: This study sets out to investigate Lunchtime Live, a twice-weekly, one-hour long current affairs show broadcast on a small community radio station, Radio Grahamstown, to understand its role in the local public sphere, and its value in helping civil society’s understanding of and involvement in the power structures and political activities in Grahamstown. Lunchtime Live seeks to cultivate a collective identity and promote public participation in the public affairs of Grahamstown. As a key avenue of investigation, this study seeks to test theory against practice, by evaluating Lunchtime Live’s aspirations against the audiences’ perception of it. This investigation uses qualitative content analysis of selected episodes of recorded transcripts of the shows that aired between August 2010 and March 2011, together with the audiences’ verbalised experiences of this programme through focus group discussions. The study principally uses qualitative research informed by reception theory. The research reveals three key findings. First, that resonance rather than resistance is the more dominant ‘stance’ or ‘attitude’ towards the content of Lunchtime Live. Residents interviewed agreed that the programme is able to give a “realistic” representation of their worldview, and thus is able to articulate issues that affect their lives. Second, that whilst the programme is helping establish links between members of the civil society as well as between civil society and their political representatives, residents feel that local democracy is failing to bring qualitative improvements to their everyday lives and that more ‘participation’ is unlikely to change this. Most respondents blame this on a lack of political will, incompetence, corruption and populist rhetoric by politicians who fail to deliver on the mantra of ‘a better life for all’ in the socioeconomic sphere. The study finds a scepticism and even cynicism that participatory media seems to be able to do little to dilute. Thirdly, in spite of the largely positive view about Lunchtime Live’s capacity to be a platform for public engagement, its participatory potential is structurally constrained by the material privations of most of its listeners. Given that in order to participate in talk shows and discussions audience members have to phone in, economic deprivation often precludes this. It is clear from this research that despite shows such as Lunchtime Live that are exploring new techniques of popular involvement, the voice of the ordinary people still struggles to be heard.
- Full Text:
- Date Issued: 2011
- Authors: Tsarwe, Stanley Zvinaiye
- Date: 2011
- Subjects: Community radio -- South Africa -- Grahamstown Radio broadcasting -- South Africa -- Grahamstown Radio journalism -- South Africa -- Grahamstown Mass media -- Political aspects -- South Africa -- Grahamstown Grahamstown (South Africa) -- Economic conditions -- 21st century Grahamstown (South Africa) -- Social conditions -- 21st century Civil society -- South Africa -- Grahamstown Political participation -- South Africa -- Grahamstown
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3488 , http://hdl.handle.net/10962/d1002943
- Description: This study sets out to investigate Lunchtime Live, a twice-weekly, one-hour long current affairs show broadcast on a small community radio station, Radio Grahamstown, to understand its role in the local public sphere, and its value in helping civil society’s understanding of and involvement in the power structures and political activities in Grahamstown. Lunchtime Live seeks to cultivate a collective identity and promote public participation in the public affairs of Grahamstown. As a key avenue of investigation, this study seeks to test theory against practice, by evaluating Lunchtime Live’s aspirations against the audiences’ perception of it. This investigation uses qualitative content analysis of selected episodes of recorded transcripts of the shows that aired between August 2010 and March 2011, together with the audiences’ verbalised experiences of this programme through focus group discussions. The study principally uses qualitative research informed by reception theory. The research reveals three key findings. First, that resonance rather than resistance is the more dominant ‘stance’ or ‘attitude’ towards the content of Lunchtime Live. Residents interviewed agreed that the programme is able to give a “realistic” representation of their worldview, and thus is able to articulate issues that affect their lives. Second, that whilst the programme is helping establish links between members of the civil society as well as between civil society and their political representatives, residents feel that local democracy is failing to bring qualitative improvements to their everyday lives and that more ‘participation’ is unlikely to change this. Most respondents blame this on a lack of political will, incompetence, corruption and populist rhetoric by politicians who fail to deliver on the mantra of ‘a better life for all’ in the socioeconomic sphere. The study finds a scepticism and even cynicism that participatory media seems to be able to do little to dilute. Thirdly, in spite of the largely positive view about Lunchtime Live’s capacity to be a platform for public engagement, its participatory potential is structurally constrained by the material privations of most of its listeners. Given that in order to participate in talk shows and discussions audience members have to phone in, economic deprivation often precludes this. It is clear from this research that despite shows such as Lunchtime Live that are exploring new techniques of popular involvement, the voice of the ordinary people still struggles to be heard.
- Full Text:
- Date Issued: 2011
A comparative case study of the strategies used by grade one teachers who teach through the medium of English
- Authors: Jackson, Gail
- Date: 2004
- Subjects: Native language and education -- South Africa Language policy -- South Africa Language and education -- South Africa English language -- Study and teaching (Elementary) -- South Africa Multilingualism -- South Africa Education, Bilingual -- South Africa
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1941 , http://hdl.handle.net/10962/d1007855
- Description: This research project begins by exploring the problems surrounding the implementation of the 1997 Language in Education Policy (LiEP), and offers insight into why some schools, despite the promotion of additive bilingualism, choose English as the primary medium of instruction. It is a comparative case study of two Grade 1 classes in different situational contexts, which highlights the teaching strategies and language practices of teachers who teach predominantly non-English speakers through the medium of English. Research carried out through this case study illustrates the use of a wide range of teaching strategies, which assist young learners when learning through an additional language. In School A, thematic linking between different learning areas to maximise vocabulary development in both the mother tongue and the additional language, as well as repetition, recycling, scaffolding and contextualisation of content were found to be important. In addition, the use of questioning to elicit understanding, as well as classroom organisation and code-switching were strategies which assisted both the teacher and learners in this multilingual environment. In School B, class size, group work and the inclusion into the timetable of a wide range of diverse activities over and above the main learning areas, which provided opportunities for language development, were important considerations. In addition, routine, predictability and an attention to detail, in keeping with a form-focussed approach, aided the children in understanding the mechanics of literacy and guiding them towards becoming phonologically aware.
- Full Text:
- Date Issued: 2004
- Authors: Jackson, Gail
- Date: 2004
- Subjects: Native language and education -- South Africa Language policy -- South Africa Language and education -- South Africa English language -- Study and teaching (Elementary) -- South Africa Multilingualism -- South Africa Education, Bilingual -- South Africa
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1941 , http://hdl.handle.net/10962/d1007855
- Description: This research project begins by exploring the problems surrounding the implementation of the 1997 Language in Education Policy (LiEP), and offers insight into why some schools, despite the promotion of additive bilingualism, choose English as the primary medium of instruction. It is a comparative case study of two Grade 1 classes in different situational contexts, which highlights the teaching strategies and language practices of teachers who teach predominantly non-English speakers through the medium of English. Research carried out through this case study illustrates the use of a wide range of teaching strategies, which assist young learners when learning through an additional language. In School A, thematic linking between different learning areas to maximise vocabulary development in both the mother tongue and the additional language, as well as repetition, recycling, scaffolding and contextualisation of content were found to be important. In addition, the use of questioning to elicit understanding, as well as classroom organisation and code-switching were strategies which assisted both the teacher and learners in this multilingual environment. In School B, class size, group work and the inclusion into the timetable of a wide range of diverse activities over and above the main learning areas, which provided opportunities for language development, were important considerations. In addition, routine, predictability and an attention to detail, in keeping with a form-focussed approach, aided the children in understanding the mechanics of literacy and guiding them towards becoming phonologically aware.
- Full Text:
- Date Issued: 2004
A comparison of the performance of three conceptual mathematical models of the rainfall-runoff process in the Mareetsane Catchment
- Authors: Stickells Peter S
- Date: 1979
- Subjects: Rain and rainfall Mathematical models South Africa Runoff
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4793 , http://hdl.handle.net/10962/d1001893
- Description: The objective of the thesis is to make a critical assessment of the performance of three relatively simple deterministic models of the rainfall-runoff process. The need to evaluate and compare deterministic models arises because of the large number of models which are available in the literature. A number of the available models would appear to be equally suitable for a given situation whereas many models are found to be valid only under the specific range of conditions for which they were developed. Therefore there is a need for guidelines to allow the most judicious selection of a model for a particular set of circumstances. The models used in the study will be tested in a semi-arid catchment to determine their applicability under ephemeral flow conditions
- Full Text:
- Date Issued: 1979
- Authors: Stickells Peter S
- Date: 1979
- Subjects: Rain and rainfall Mathematical models South Africa Runoff
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4793 , http://hdl.handle.net/10962/d1001893
- Description: The objective of the thesis is to make a critical assessment of the performance of three relatively simple deterministic models of the rainfall-runoff process. The need to evaluate and compare deterministic models arises because of the large number of models which are available in the literature. A number of the available models would appear to be equally suitable for a given situation whereas many models are found to be valid only under the specific range of conditions for which they were developed. Therefore there is a need for guidelines to allow the most judicious selection of a model for a particular set of circumstances. The models used in the study will be tested in a semi-arid catchment to determine their applicability under ephemeral flow conditions
- Full Text:
- Date Issued: 1979
A Model for Intrusion Detection in IoT using Machine Learning
- Authors: Nkala, Junior Ruddy
- Date: 2019
- Subjects: Internet of things
- Language: English
- Type: Thesis , Masters , MSc (Computer Science )
- Identifier: http://hdl.handle.net/10353/17180 , vital:40863
- Description: The Internet of Things is an open and comprehensive global network of intelligent objects that have the capacity to auto-organize, share information, data and resources. There are currently over a billion devices connected to the Internet, and this number increases by the day. While these devices make our life easier, safer and healthier, they are expanding the number of attack targets vulnerable to cyber-attacks from potential hackers and malicious software. Therefore, protecting these devices from adversaries and unauthorized access and modification is very important. The purpose of this study is to develop a secure lightweight intrusion and anomaly detection model for IoT to help detect threats in the environment. We propose the use of data mining and machine learning algorithms as a classification technique for detecting abnormal or malicious traffic transmitted between devices due to potential attacks such as DoS, Man-In-Middle and Flooding attacks at the application level. This study makes use of two robust machine learning algorithms, namely the C4.5 Decision Trees and K-means clustering to develop an anomaly detection model. MATLAB Math Simulator was used for implementation. The study conducts a series of experiments in detecting abnormal data and normal data in a dataset that contains gas concentration readings from a number of sensors deployed in an Italian city over a year. Thereafter we examined the classification performance in terms of accuracy of our proposed anomaly detection model. Results drawn from the experiments conducted indicate that the size of the training sample improves classification ability of the proposed model. Our findings noted that the choice of discretization algorithm does matter in the quest for optimal classification performance. The proposed model proved accurate in detecting anomalies in IoT, and classifying between normal and abnormal data. The proposed model has a classification accuracy of 96.51% which proved to be higher compared to other algorithms such as the Naïve Bayes. The model proved to be lightweight and efficient in-terms of being faster at training and testing as compared to Artificial Neural Networks. The conclusions drawn from this research are a perspective from a novice machine learning researcher with valuable recommendations that ensure optimal classification of normal and abnormal IoT data.
- Full Text:
- Date Issued: 2019
- Authors: Nkala, Junior Ruddy
- Date: 2019
- Subjects: Internet of things
- Language: English
- Type: Thesis , Masters , MSc (Computer Science )
- Identifier: http://hdl.handle.net/10353/17180 , vital:40863
- Description: The Internet of Things is an open and comprehensive global network of intelligent objects that have the capacity to auto-organize, share information, data and resources. There are currently over a billion devices connected to the Internet, and this number increases by the day. While these devices make our life easier, safer and healthier, they are expanding the number of attack targets vulnerable to cyber-attacks from potential hackers and malicious software. Therefore, protecting these devices from adversaries and unauthorized access and modification is very important. The purpose of this study is to develop a secure lightweight intrusion and anomaly detection model for IoT to help detect threats in the environment. We propose the use of data mining and machine learning algorithms as a classification technique for detecting abnormal or malicious traffic transmitted between devices due to potential attacks such as DoS, Man-In-Middle and Flooding attacks at the application level. This study makes use of two robust machine learning algorithms, namely the C4.5 Decision Trees and K-means clustering to develop an anomaly detection model. MATLAB Math Simulator was used for implementation. The study conducts a series of experiments in detecting abnormal data and normal data in a dataset that contains gas concentration readings from a number of sensors deployed in an Italian city over a year. Thereafter we examined the classification performance in terms of accuracy of our proposed anomaly detection model. Results drawn from the experiments conducted indicate that the size of the training sample improves classification ability of the proposed model. Our findings noted that the choice of discretization algorithm does matter in the quest for optimal classification performance. The proposed model proved accurate in detecting anomalies in IoT, and classifying between normal and abnormal data. The proposed model has a classification accuracy of 96.51% which proved to be higher compared to other algorithms such as the Naïve Bayes. The model proved to be lightweight and efficient in-terms of being faster at training and testing as compared to Artificial Neural Networks. The conclusions drawn from this research are a perspective from a novice machine learning researcher with valuable recommendations that ensure optimal classification of normal and abnormal IoT data.
- Full Text:
- Date Issued: 2019
A review of generalized linear models for count data with emphasis on current geospatial procedures
- Authors: Michell, Justin Walter
- Date: 2016
- Subjects: Spatial analysis (Statistics) , Bayesian statistical decision theory , Geospatial data , Malaria -- Botswana -- Statistics , Malaria -- Botswana -- Research -- Statistical methods
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: vital:5582 , http://hdl.handle.net/10962/d1019989
- Description: Analytical problems caused by over-fitting, confounding and non-independence in the data is a major challenge for variable selection. As more variables are tested against a certain data set, there is a greater risk that some will explain the data merely by chance, but will fail to explain new data. The main aim of this study is to employ a systematic and practicable variable selection process for the spatial analysis and mapping of historical malaria risk in Botswana using data collected from the MARA (Mapping Malaria Risk in Africa) project and environmental and climatic datasets from various sources. Details of how a spatial database is compiled for a statistical analysis to proceed is provided. The automation of the entire process is also explored. The final bayesian spatial model derived from the non-spatial variable selection procedure using Markov Chain Monte Carlo simulation was fitted to the data. Winter temperature had the greatest effect of malaria prevalence in Botswana. Summer rainfall, maximum temperature of the warmest month, annual range of temperature, altitude and distance to closest water source were also significantly associated with malaria prevalence in the final spatial model after accounting for spatial correlation. Using this spatial model malaria prevalence at unobserved locations was predicted, producing a smooth risk map covering Botswana. The automation of both compiling the spatial database and the variable selection procedure proved challenging and could only be achieved in parts of the process. The non-spatial selection procedure proved practical and was able to identify stable explanatory variables and provide an objective means for selecting one variable over another, however ultimately it was not entirely successful due to the fact that a unique set of spatial variables could not be selected.
- Full Text:
- Date Issued: 2016
- Authors: Michell, Justin Walter
- Date: 2016
- Subjects: Spatial analysis (Statistics) , Bayesian statistical decision theory , Geospatial data , Malaria -- Botswana -- Statistics , Malaria -- Botswana -- Research -- Statistical methods
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: vital:5582 , http://hdl.handle.net/10962/d1019989
- Description: Analytical problems caused by over-fitting, confounding and non-independence in the data is a major challenge for variable selection. As more variables are tested against a certain data set, there is a greater risk that some will explain the data merely by chance, but will fail to explain new data. The main aim of this study is to employ a systematic and practicable variable selection process for the spatial analysis and mapping of historical malaria risk in Botswana using data collected from the MARA (Mapping Malaria Risk in Africa) project and environmental and climatic datasets from various sources. Details of how a spatial database is compiled for a statistical analysis to proceed is provided. The automation of the entire process is also explored. The final bayesian spatial model derived from the non-spatial variable selection procedure using Markov Chain Monte Carlo simulation was fitted to the data. Winter temperature had the greatest effect of malaria prevalence in Botswana. Summer rainfall, maximum temperature of the warmest month, annual range of temperature, altitude and distance to closest water source were also significantly associated with malaria prevalence in the final spatial model after accounting for spatial correlation. Using this spatial model malaria prevalence at unobserved locations was predicted, producing a smooth risk map covering Botswana. The automation of both compiling the spatial database and the variable selection procedure proved challenging and could only be achieved in parts of the process. The non-spatial selection procedure proved practical and was able to identify stable explanatory variables and provide an objective means for selecting one variable over another, however ultimately it was not entirely successful due to the fact that a unique set of spatial variables could not be selected.
- Full Text:
- Date Issued: 2016
A situational survey of Siyazondla homestead food production proogramme and food security, poverty alleviation in selected communities of Nkonkobe Local Municipality of the Eastern Cape
- Authors: Phezisa, Bulelani
- Date: 2016
- Subjects: Food security -- South Africa -- Eastern Cape Food supply -- South Africa -- Eastern Cape Poverty -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10353/2392 , vital:27795
- Description: People living in rural areas are continually losing their value, dignity, ubuntu and rural nature of livelihood. Agriculture in these areas characterises the nature of rural livelihood. Traditionally, people living in rural areas were highly dependent on their production from gardens for food, income (barter exchange), and other social activities. Nowadays, that motive and interest is no longer operating at its full potential, so to revive that history and nature, household (homestead) production, certain programmes were introduced to greatly improved the standard of living of the poor, and it has proved to have an impact as it has generated income, and created food stability and employment through the project. Home gardens are there and can be used as the method and the strategy toward improvement and development of the people around the world, more especial to developing countries. Certain programmes that are initiated for acting against the challenges faced by rural people have failed to materialise and operate on their fully potential. The Siyazondla homestead food production programme is the one of the programmes practiced by the government of South Africa to act against such challenges, affecting especially poor people. This study was aimed at assessing the role of Siyazondla homestead food production programme in food security and poverty alleviation in selected communities of Nkonkobe local municipality of the Eastern Cape. It took the form of a case study in Msobomvu, Ngcothoyi and Binfield locations. The Nkonkobe local municipality is demarcated into five major areas: Middledrift, Alice, Seymour, Fort Beaufort and Balfour. The study sample was collected from beneficiaries and non-beneficiaries of the Siyazondla programme. The sample size was 90 respondents, from which in one area, a 15 beneficiaries and anticipated non- beneficiaries were targeted. The target sample from each village was collected from 15 beneficiaries and non-beneficiaries. Many farmers from the study area benefited from the programme, though a limited number was targeted. Therefore, a probability sampling was applied and employed, where there were more than required number of beneficiaries of the programme and anticipated beneficiaries of the programme. The study was effectively and efficiently carried out and achieved with the use of personal interviewing of the recipients by use of questionnaires. The study was analysed by a computerised programme of analyses called SPSS v.2.1 and excel. The objectives of the study based on food security, poverty alleviation and reduction, and also improving nutritious status. The finding of the research clearly indicates the outcome of the programme on livelihood basis of the beneficiaries. Some of the objectives of the programme were achieved, such as food security and nutritious levels, whilst other objectives had shortcomings. The finding of the study also shows that programme, though had original benefits but also there are the anticipated and probable benefits of the programme Siyazondla, such as income, skill of farming, improving social status, and there are some possibilities when the programme is properly implemented. Though the majority of people are concentrated in rural areas, the programme on its own had shortcoming to meet needs of the whole population, as food insecurity, unemployment and poverty are taking its course. The programme on its own had shortcoming such as lack of adequate resource and as results, very few people benefited from the programme. Another shortcoming of the programme is the effectiveness of agricultural extension personnel to certain aspect such as marketing of farmers produce and proper monitoring and evaluation of the programme. Therefore, in the long run programmes of this nature are promising, there will be some development and improvement toward growth and better standards of livelihood. It is through this study that had to assess the structure, procedure, strategies implemented of the programme and impact of the programme to both beneficiaries and anticipated beneficiaries of the programme.
- Full Text:
- Date Issued: 2016
- Authors: Phezisa, Bulelani
- Date: 2016
- Subjects: Food security -- South Africa -- Eastern Cape Food supply -- South Africa -- Eastern Cape Poverty -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10353/2392 , vital:27795
- Description: People living in rural areas are continually losing their value, dignity, ubuntu and rural nature of livelihood. Agriculture in these areas characterises the nature of rural livelihood. Traditionally, people living in rural areas were highly dependent on their production from gardens for food, income (barter exchange), and other social activities. Nowadays, that motive and interest is no longer operating at its full potential, so to revive that history and nature, household (homestead) production, certain programmes were introduced to greatly improved the standard of living of the poor, and it has proved to have an impact as it has generated income, and created food stability and employment through the project. Home gardens are there and can be used as the method and the strategy toward improvement and development of the people around the world, more especial to developing countries. Certain programmes that are initiated for acting against the challenges faced by rural people have failed to materialise and operate on their fully potential. The Siyazondla homestead food production programme is the one of the programmes practiced by the government of South Africa to act against such challenges, affecting especially poor people. This study was aimed at assessing the role of Siyazondla homestead food production programme in food security and poverty alleviation in selected communities of Nkonkobe local municipality of the Eastern Cape. It took the form of a case study in Msobomvu, Ngcothoyi and Binfield locations. The Nkonkobe local municipality is demarcated into five major areas: Middledrift, Alice, Seymour, Fort Beaufort and Balfour. The study sample was collected from beneficiaries and non-beneficiaries of the Siyazondla programme. The sample size was 90 respondents, from which in one area, a 15 beneficiaries and anticipated non- beneficiaries were targeted. The target sample from each village was collected from 15 beneficiaries and non-beneficiaries. Many farmers from the study area benefited from the programme, though a limited number was targeted. Therefore, a probability sampling was applied and employed, where there were more than required number of beneficiaries of the programme and anticipated beneficiaries of the programme. The study was effectively and efficiently carried out and achieved with the use of personal interviewing of the recipients by use of questionnaires. The study was analysed by a computerised programme of analyses called SPSS v.2.1 and excel. The objectives of the study based on food security, poverty alleviation and reduction, and also improving nutritious status. The finding of the research clearly indicates the outcome of the programme on livelihood basis of the beneficiaries. Some of the objectives of the programme were achieved, such as food security and nutritious levels, whilst other objectives had shortcomings. The finding of the study also shows that programme, though had original benefits but also there are the anticipated and probable benefits of the programme Siyazondla, such as income, skill of farming, improving social status, and there are some possibilities when the programme is properly implemented. Though the majority of people are concentrated in rural areas, the programme on its own had shortcoming to meet needs of the whole population, as food insecurity, unemployment and poverty are taking its course. The programme on its own had shortcoming such as lack of adequate resource and as results, very few people benefited from the programme. Another shortcoming of the programme is the effectiveness of agricultural extension personnel to certain aspect such as marketing of farmers produce and proper monitoring and evaluation of the programme. Therefore, in the long run programmes of this nature are promising, there will be some development and improvement toward growth and better standards of livelihood. It is through this study that had to assess the structure, procedure, strategies implemented of the programme and impact of the programme to both beneficiaries and anticipated beneficiaries of the programme.
- Full Text:
- Date Issued: 2016
A systematic study of Berkheya and allies (Compositae)
- Authors: Phaliso, Ntombifikile
- Date: 2013
- Subjects: Compositae -- Africa, Southern , Daisies -- Africa, Southern , Compositae -- Phylogeny -- Africa, Southern , Compositae -- Geographical distribution -- Africa, Southern , Compositae -- Classification -- Africa, Southern , Cladistic analysis
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4179 , http://hdl.handle.net/10962/d1003054
- Description: Berkheya Ehrh. is a genus of daisies in the tribe Arctotideae, subtribe Gorteriinae with over 80 species, most of which occur in southern Africa. This genus has centres of diversity associated with the montane regions of South Africa, including the Drakensberg Alpine Centre and Mpumalanga escarpment regions. Previous molecular and morphological studies indicate that Berkheya is paraphyletic. I present phylogenies based on nrDNA (ITS; Internal Transcribed Spacer) and cpDNA (psbA-trnH) sequence data analysed with Bayesian Inference and Parsimony. A phylogeny of combined cp- and nrDNA is also presented. These phylogenies are used to assess generic limits and to investigate the biogeographic patterns of Berkheya and its allies. The ITS phylogeny shows five well supported clades of Berkheya, two of which (Clades I and 2) are monophyletic summer rainfall region clades. Clades 3 to 5 are all paraphyletic winter rainfall clades with Cullumia occurring in the third clade, Cuspida occurring in the fourth and Didelta in Clade 5. Both psbA-trnH and combined phylogenies show concordance with the clade distribution shown in the ITS phylogeny. The ITS phylogeny was used to analyse correspondence with Roessler’s (1959) Series. It was found that the phylogeny showed considerable agreement with Roessler’s series, but B. bipinnatifida and B. spinosa of Series Speciosae may require some revision as well as taxa of monotypic series Cruciatae and Angustae. It is suggested that the latter series be merged with Cullumia species to form a single series. Some consideration should be taken to include Didelta species into Series Fruticosae as Didelta occurs in subclade 5b of Clade 5 with other Series Fruticosae taxa. Achene morphology was examined from species from each of the five clades to investigate the relationships of Berkheya and its allies, as well as to determine if there were any consistent achene features for each clade. The structure of surface cells on the fruit, the presence, absence and morphology of twin hairs as well as the structure of the pappus scales were found to be most useful in reflecting phylogenetic relationships within the clades. When compared with the clades of the ITS phylogeny, achene morphology showed consistent characters between taxa occurring in the same clades. As the most comprehensive study involving Berkheya, this phylogenenetic investigation was able to confirm that Berkheya is a paraphyletic genus with Didelta, Cullumia and Cuspida needing to be subsumed into Berkheya. An alternative classification is that taxa of Clade 5 could possibly be erected as an expanded Didelta, separate and sister to Berkheya.
- Full Text:
- Date Issued: 2013
- Authors: Phaliso, Ntombifikile
- Date: 2013
- Subjects: Compositae -- Africa, Southern , Daisies -- Africa, Southern , Compositae -- Phylogeny -- Africa, Southern , Compositae -- Geographical distribution -- Africa, Southern , Compositae -- Classification -- Africa, Southern , Cladistic analysis
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4179 , http://hdl.handle.net/10962/d1003054
- Description: Berkheya Ehrh. is a genus of daisies in the tribe Arctotideae, subtribe Gorteriinae with over 80 species, most of which occur in southern Africa. This genus has centres of diversity associated with the montane regions of South Africa, including the Drakensberg Alpine Centre and Mpumalanga escarpment regions. Previous molecular and morphological studies indicate that Berkheya is paraphyletic. I present phylogenies based on nrDNA (ITS; Internal Transcribed Spacer) and cpDNA (psbA-trnH) sequence data analysed with Bayesian Inference and Parsimony. A phylogeny of combined cp- and nrDNA is also presented. These phylogenies are used to assess generic limits and to investigate the biogeographic patterns of Berkheya and its allies. The ITS phylogeny shows five well supported clades of Berkheya, two of which (Clades I and 2) are monophyletic summer rainfall region clades. Clades 3 to 5 are all paraphyletic winter rainfall clades with Cullumia occurring in the third clade, Cuspida occurring in the fourth and Didelta in Clade 5. Both psbA-trnH and combined phylogenies show concordance with the clade distribution shown in the ITS phylogeny. The ITS phylogeny was used to analyse correspondence with Roessler’s (1959) Series. It was found that the phylogeny showed considerable agreement with Roessler’s series, but B. bipinnatifida and B. spinosa of Series Speciosae may require some revision as well as taxa of monotypic series Cruciatae and Angustae. It is suggested that the latter series be merged with Cullumia species to form a single series. Some consideration should be taken to include Didelta species into Series Fruticosae as Didelta occurs in subclade 5b of Clade 5 with other Series Fruticosae taxa. Achene morphology was examined from species from each of the five clades to investigate the relationships of Berkheya and its allies, as well as to determine if there were any consistent achene features for each clade. The structure of surface cells on the fruit, the presence, absence and morphology of twin hairs as well as the structure of the pappus scales were found to be most useful in reflecting phylogenetic relationships within the clades. When compared with the clades of the ITS phylogeny, achene morphology showed consistent characters between taxa occurring in the same clades. As the most comprehensive study involving Berkheya, this phylogenenetic investigation was able to confirm that Berkheya is a paraphyletic genus with Didelta, Cullumia and Cuspida needing to be subsumed into Berkheya. An alternative classification is that taxa of Clade 5 could possibly be erected as an expanded Didelta, separate and sister to Berkheya.
- Full Text:
- Date Issued: 2013
An investigation into how grade 9 girls participate during practical work in Physical Science lessons : a case study
- Authors: Munyanyo, Johanna
- Date: 2015
- Subjects: Physical sciences -- Study and teaching (Secondary) -- Namibia , Teenage girls -- Education , Sex differences in education -- Namibia , Sex discrimination in education -- Namibia , Physical sciences -- Study and teaching (Secondary) -- Sex differences
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:2042 , http://hdl.handle.net/10962/d1017353
- Description: This research report documented in this thesis focused mainly on the participation of grade 9 girls during practical work in the topic of ‘Electricity’ in Physical Science lessons at Mwatya (pseudonym) Junior Secondary School in Ohangwena region of Namibia. The study was triggered by the lack of participation of girls during practical work. Underpinned by an interpretive paradigm, the study took the form of a qualitative case study and my unit of analysis was girls’ participation during practical work on electricity in particular. The perceptions and experiences of girls about practical work in Physical Science were investigated using the administered questionnaires. The participation of girls during practical work was further explored using interviews (semi-structured and focus group interviews) and observations of selected girls. A thematic approach to data analysis was adopted. The qualitative data from the audio and video transcripts were analysed according to the categories developed and themes that emerged from the analysis process. The categories developed for presenting the data are: teaching methods preferred by girls; importance and roles of practical activities; things that girls enjoy during practical activities; problems experienced by girls during practical activities; preference for doing practical work in groups or as an individual task; if practical work given in groups should the sex of learners be considered or not; activities preferred by girls when they are in single sex and in mixed sex groups; factors that enable girls to participate; and factors that prevent girls from participating. The study found that girls’ perceptions about practical work affect their participation during practical work in the topic of Electricity. It also revealed different factors that contribute to either good or poor participation of girls, namely, factors such as mixed-sex group-work, limited science prior experience (knowledge), unequal treatment from teachers during lessons and home environment were identified as contributing to poor participation. Girls however suggested some factors that they think could enable them to participate freely and actively during practical work. In view of these findings, this study recommends that teacher training institutions should train teachers to plan practical work in a gender sensitive manner. Schools should be provided with enough materials as sharing materials can contribute to poor participation of girls during practical work especially when they are in mixed groups with boys. There is a need for science teachers to assess the learning taking place during practical work and, finally, textbook suppliers should be monitored in a way that enables the supply of gender sensitive printed materials.
- Full Text:
- Date Issued: 2015
- Authors: Munyanyo, Johanna
- Date: 2015
- Subjects: Physical sciences -- Study and teaching (Secondary) -- Namibia , Teenage girls -- Education , Sex differences in education -- Namibia , Sex discrimination in education -- Namibia , Physical sciences -- Study and teaching (Secondary) -- Sex differences
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:2042 , http://hdl.handle.net/10962/d1017353
- Description: This research report documented in this thesis focused mainly on the participation of grade 9 girls during practical work in the topic of ‘Electricity’ in Physical Science lessons at Mwatya (pseudonym) Junior Secondary School in Ohangwena region of Namibia. The study was triggered by the lack of participation of girls during practical work. Underpinned by an interpretive paradigm, the study took the form of a qualitative case study and my unit of analysis was girls’ participation during practical work on electricity in particular. The perceptions and experiences of girls about practical work in Physical Science were investigated using the administered questionnaires. The participation of girls during practical work was further explored using interviews (semi-structured and focus group interviews) and observations of selected girls. A thematic approach to data analysis was adopted. The qualitative data from the audio and video transcripts were analysed according to the categories developed and themes that emerged from the analysis process. The categories developed for presenting the data are: teaching methods preferred by girls; importance and roles of practical activities; things that girls enjoy during practical activities; problems experienced by girls during practical activities; preference for doing practical work in groups or as an individual task; if practical work given in groups should the sex of learners be considered or not; activities preferred by girls when they are in single sex and in mixed sex groups; factors that enable girls to participate; and factors that prevent girls from participating. The study found that girls’ perceptions about practical work affect their participation during practical work in the topic of Electricity. It also revealed different factors that contribute to either good or poor participation of girls, namely, factors such as mixed-sex group-work, limited science prior experience (knowledge), unequal treatment from teachers during lessons and home environment were identified as contributing to poor participation. Girls however suggested some factors that they think could enable them to participate freely and actively during practical work. In view of these findings, this study recommends that teacher training institutions should train teachers to plan practical work in a gender sensitive manner. Schools should be provided with enough materials as sharing materials can contribute to poor participation of girls during practical work especially when they are in mixed groups with boys. There is a need for science teachers to assess the learning taking place during practical work and, finally, textbook suppliers should be monitored in a way that enables the supply of gender sensitive printed materials.
- Full Text:
- Date Issued: 2015
An investigation of factors which influence integrating indigenous knowledge of medicinal plants into the learning programme for Grade 9 General Science
- Authors: Kimbugwe, Francis Kambugu
- Date: 2001
- Subjects: Ethnoscience Ethnoscience -- South Africa -- Eastern Cape Medicinal plants -- South Africa -- Eastern Cape Curriculum planning -- South Africa
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1624 , http://hdl.handle.net/10962/d1003506
- Description: This study explores knowledge of some medicinal plants amongst the sub-urban community of and around a township in the Eastern Cape province. This qualitative interpretivist case study presents the prior knowledge of medicinal plants possessed by Grade 9 learners, which is used as a springboard toward interviewing traditional healers, herbal practitioners and lecturers at a university in the departments of Botany and Pharmacy. The data obtained from the informants reveals the factors that can influence integration of indigenous knowledge of medicinal plants in the learning programme for grade 9 General Science. These factors include: prior knowledge and enthusiasm of Grade 9 learners and teachers, support of the community which include parents, traditional healers, herbal practitioners and professionals who could introduce indigenous knowledge of medicinal plants into formal education, availability of resource materials and complexity of identifying pharmacologically tested plants from other indigenous medicinal plants. The analysis and discussion of the findings, have led me to conclude that the enthusiasm of learners who have a rich background of indigenous knowledge on medicinal plants is likely to be hampered by the unenthusiastic teachers as well as the reluctance of herbal practitioners in their communities to part with this knowledge. Hence I recommend that teachers be motivated through workshops and in-service training, conducted by goverr\ment paid herbal practitioners using the prior knowledge of learners as a stepping-stone.
- Full Text:
- Date Issued: 2001
- Authors: Kimbugwe, Francis Kambugu
- Date: 2001
- Subjects: Ethnoscience Ethnoscience -- South Africa -- Eastern Cape Medicinal plants -- South Africa -- Eastern Cape Curriculum planning -- South Africa
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1624 , http://hdl.handle.net/10962/d1003506
- Description: This study explores knowledge of some medicinal plants amongst the sub-urban community of and around a township in the Eastern Cape province. This qualitative interpretivist case study presents the prior knowledge of medicinal plants possessed by Grade 9 learners, which is used as a springboard toward interviewing traditional healers, herbal practitioners and lecturers at a university in the departments of Botany and Pharmacy. The data obtained from the informants reveals the factors that can influence integration of indigenous knowledge of medicinal plants in the learning programme for grade 9 General Science. These factors include: prior knowledge and enthusiasm of Grade 9 learners and teachers, support of the community which include parents, traditional healers, herbal practitioners and professionals who could introduce indigenous knowledge of medicinal plants into formal education, availability of resource materials and complexity of identifying pharmacologically tested plants from other indigenous medicinal plants. The analysis and discussion of the findings, have led me to conclude that the enthusiasm of learners who have a rich background of indigenous knowledge on medicinal plants is likely to be hampered by the unenthusiastic teachers as well as the reluctance of herbal practitioners in their communities to part with this knowledge. Hence I recommend that teachers be motivated through workshops and in-service training, conducted by goverr\ment paid herbal practitioners using the prior knowledge of learners as a stepping-stone.
- Full Text:
- Date Issued: 2001
An investigation of local community contributions to the Malawi College of Fisheries curriculum: a case study focussing on the Chambo fishery
- Kachilonda, Dick Daffu Kachanga
- Authors: Kachilonda, Dick Daffu Kachanga
- Date: 2005
- Subjects: Malawi College of Fisheries -- Curricula Fishery management -- Study and teaching Fishery management -- Malawi Fisheries -- Malawi Fishes -- Nyasa, Lake
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1857 , http://hdl.handle.net/10962/d1004537
- Description: The aim of the study was to investigate local community contributions to the existing Malawi College of Fisheries curriculum with a focus on Chambo fishery. Chambo fish (Oreochromis species) is the most favoured fish in Lake Malawi. Chambo catches have declined over the years. Responding to the declining catches, the Fisheries Department is engaged in a number of management options to address the issues. Most of these management options are governed by scientific recommendations and do not consider the socio-economic situation of the people who are dependent on fishery. This approach to fishery has influenced the Malawi College of Fisheries curriculum. The existing curriculum is product-centred, developed by a consultant. During the development of the curriculum, there was little consultation with the lecturers and no consultation with the local communities who are using the resource. The fishing communities have been fishing for a long time and have acquired knowledge, skills and experience worth investigating for its potential role in improving the existing curriculum. Through the use of interviews, focus group discussions and workshops with local communities local knowledge was identified for inclusion into the curriculum. A review of the existing curriculum revealed that it has primarily technical focus, grounded in the protection, control and management of the fish stocks, while the local knowledge has a practical focus based on existing practices and requiring an understanding of the sources of the issues. There is also more emphasis on a historical perspective and the context in which fishing practices take place at the moment. It was evident from the study that local communities have much of knowledge, skills and experience gained over the years of fishing , and if properly utilised, it can improve the MCF curriculum. I therefore recommend in this study that the curriculum be reviewed in order to integrate and draw on the local knowledge through a deliberative and participatory process between the local communities and the government so that it addresses the needs of the local communities and improves the training of the extension workers.
- Full Text:
- Date Issued: 2005
- Authors: Kachilonda, Dick Daffu Kachanga
- Date: 2005
- Subjects: Malawi College of Fisheries -- Curricula Fishery management -- Study and teaching Fishery management -- Malawi Fisheries -- Malawi Fishes -- Nyasa, Lake
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1857 , http://hdl.handle.net/10962/d1004537
- Description: The aim of the study was to investigate local community contributions to the existing Malawi College of Fisheries curriculum with a focus on Chambo fishery. Chambo fish (Oreochromis species) is the most favoured fish in Lake Malawi. Chambo catches have declined over the years. Responding to the declining catches, the Fisheries Department is engaged in a number of management options to address the issues. Most of these management options are governed by scientific recommendations and do not consider the socio-economic situation of the people who are dependent on fishery. This approach to fishery has influenced the Malawi College of Fisheries curriculum. The existing curriculum is product-centred, developed by a consultant. During the development of the curriculum, there was little consultation with the lecturers and no consultation with the local communities who are using the resource. The fishing communities have been fishing for a long time and have acquired knowledge, skills and experience worth investigating for its potential role in improving the existing curriculum. Through the use of interviews, focus group discussions and workshops with local communities local knowledge was identified for inclusion into the curriculum. A review of the existing curriculum revealed that it has primarily technical focus, grounded in the protection, control and management of the fish stocks, while the local knowledge has a practical focus based on existing practices and requiring an understanding of the sources of the issues. There is also more emphasis on a historical perspective and the context in which fishing practices take place at the moment. It was evident from the study that local communities have much of knowledge, skills and experience gained over the years of fishing , and if properly utilised, it can improve the MCF curriculum. I therefore recommend in this study that the curriculum be reviewed in order to integrate and draw on the local knowledge through a deliberative and participatory process between the local communities and the government so that it addresses the needs of the local communities and improves the training of the extension workers.
- Full Text:
- Date Issued: 2005
An investigation of Raymond Mhlaba municipality indigent policy on water service delivery: a case study of free basic water policy (FBWP) in selected areas of Golf Course and Bhofolo.
- Authors: Ncube, Mary Silibaziso
- Date: 2019
- Subjects: Community development
- Language: English
- Type: Thesis , Masters , MCom (Development Studies)
- Identifier: http://hdl.handle.net/10353/16974 , vital:40799
- Description: The study was looking at the Free Basic Water policy (FBWP) in the Eastern Cape which was introduced in July 2001 in South Africa. FBWP was introduced to all provinces, however people living in rural areas, poor areas and villages are still suffering from lack of clean and safe drinking water. People lack adequate supplies of water and this creates conditions under which the diseases thrive. The researcher used mixed research methodology which comprises of qualitative (interview) and quantitative (questionnaire) approaches. The reason for the use of mixed methodology was to get adequate information both from the municipality (the provider of water) and the residents (the receivers of the services provided by the municipality) in order to assess how the unreliable water provision affect residents and the challenges being faced by the municipality in providing water. The findings of the study are that both people under Golf course and Bhofolo have little knowledge about FBW and most of the residents are unable to pay their water bills. Residents in the two research areas suffer from medical problems due to unreliable water provision. The study is therefore, of view that South Africa needs to prioritise improvement of access to water in rural areas, poor areas and villages. There is a need to educate people about FBW and on how to save water.
- Full Text:
- Date Issued: 2019
- Authors: Ncube, Mary Silibaziso
- Date: 2019
- Subjects: Community development
- Language: English
- Type: Thesis , Masters , MCom (Development Studies)
- Identifier: http://hdl.handle.net/10353/16974 , vital:40799
- Description: The study was looking at the Free Basic Water policy (FBWP) in the Eastern Cape which was introduced in July 2001 in South Africa. FBWP was introduced to all provinces, however people living in rural areas, poor areas and villages are still suffering from lack of clean and safe drinking water. People lack adequate supplies of water and this creates conditions under which the diseases thrive. The researcher used mixed research methodology which comprises of qualitative (interview) and quantitative (questionnaire) approaches. The reason for the use of mixed methodology was to get adequate information both from the municipality (the provider of water) and the residents (the receivers of the services provided by the municipality) in order to assess how the unreliable water provision affect residents and the challenges being faced by the municipality in providing water. The findings of the study are that both people under Golf course and Bhofolo have little knowledge about FBW and most of the residents are unable to pay their water bills. Residents in the two research areas suffer from medical problems due to unreliable water provision. The study is therefore, of view that South Africa needs to prioritise improvement of access to water in rural areas, poor areas and villages. There is a need to educate people about FBW and on how to save water.
- Full Text:
- Date Issued: 2019
An investigation of school gardens in the curriculum: recontextualising the biodiversity discourse in the national curriculum statement: a case of Mount Zion Junior Secondary School
- Tundzi, Kenneth Simphiwe Vuyisa
- Authors: Tundzi, Kenneth Simphiwe Vuyisa
- Date: 2009
- Subjects: South African National Biodiversity Institute Curriculum change -- South Africa Case studies Environmental education -- Curricula -- South Africa -- Case studies School gardens -- South Africa -- Case studies Science -- Study and teaching (Secondary) -- South Africa -- Case studies Teacher participation in curriculum planning -- South Africa -- Case studies Educational change -- South Africa -- Case studies Education -- South Africa -- Curricula Education and state -- South Africa
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1642 , http://hdl.handle.net/10962/d1003524
- Description: With the dawning of a new era in South African politics in 1994 it became evident that education was going to be re-organised along with other government structures in South Africa. I begin the study by reviewing this curriculum change in South Africa that has taken place since 1995. This involved the development Curriculum 2005 (C2005) and the subsequent revision of C2005, which is now the National Curriculum Statement (NCS). This curriculum introduced an environmental focus into all the Learning Areas, which gave teachers a mandate not only to teach about environmental concepts and issues (such as biodiversity) at schools but to also address them in the communities outside the schools. This study considers biodiversity issues as biodiversity is a new focus in South African policy more broadly, and particularly in the Natural Science Learning Area. Our school has received vegetable and indigenous plant gardens from the South African National Biodiversity Institute, which provides a rich new resource for teaching about biodiversity, particularly in the Natural Sciences. My interest in the study was to investigate how schools (teachers) can use school gardens in the recontextualisation of the National Curriculum Statements focusing on the Natural Science Learning Area in Grade 7 at my school. I used Bernstein’s (1990) concepts of delocation, relocation, ideological transformation and selective appropriation and Cornbleth’s (1990) theory of curriculum contextualization to understand and interpret the recontextualisation process in the four lessons studied. In this research I was involved in the planning of the lessons with the Grade 7 Natural Science teacher. I taught one lesson as a demonstration and then observed while the teacher taught the other three lessons. I conducted this study as an action research case study. I used focus group interviews, classroom observations, document analysis and interviews as methods of data collection. The study found that the use of school gardens for teaching biodiversity can help with the recontextualisation of NCS in schools, and for the teaching of biodiversity, but that there is a need to understand and address various recontextualisation issues if this is to be done effectively. The study revealed that use of the school gardens for learning about biodiversity in the NS Learning Area is influenced by teachers’ knowledge, experience, teaching styles and available resources, as well as management issues and the complexity of the NCS discourse itself. The study also revealed that socio-cultural and structural factors (e.g. language and class size) also affect how biodiversity is taught in schools, and thus how the recontextualisation of the NCS takes place. The study concludes by making recommendations for taking this work forward in the context of our school as it addresses the gap that exists between policy and practice.
- Full Text:
- Date Issued: 2009
- Authors: Tundzi, Kenneth Simphiwe Vuyisa
- Date: 2009
- Subjects: South African National Biodiversity Institute Curriculum change -- South Africa Case studies Environmental education -- Curricula -- South Africa -- Case studies School gardens -- South Africa -- Case studies Science -- Study and teaching (Secondary) -- South Africa -- Case studies Teacher participation in curriculum planning -- South Africa -- Case studies Educational change -- South Africa -- Case studies Education -- South Africa -- Curricula Education and state -- South Africa
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1642 , http://hdl.handle.net/10962/d1003524
- Description: With the dawning of a new era in South African politics in 1994 it became evident that education was going to be re-organised along with other government structures in South Africa. I begin the study by reviewing this curriculum change in South Africa that has taken place since 1995. This involved the development Curriculum 2005 (C2005) and the subsequent revision of C2005, which is now the National Curriculum Statement (NCS). This curriculum introduced an environmental focus into all the Learning Areas, which gave teachers a mandate not only to teach about environmental concepts and issues (such as biodiversity) at schools but to also address them in the communities outside the schools. This study considers biodiversity issues as biodiversity is a new focus in South African policy more broadly, and particularly in the Natural Science Learning Area. Our school has received vegetable and indigenous plant gardens from the South African National Biodiversity Institute, which provides a rich new resource for teaching about biodiversity, particularly in the Natural Sciences. My interest in the study was to investigate how schools (teachers) can use school gardens in the recontextualisation of the National Curriculum Statements focusing on the Natural Science Learning Area in Grade 7 at my school. I used Bernstein’s (1990) concepts of delocation, relocation, ideological transformation and selective appropriation and Cornbleth’s (1990) theory of curriculum contextualization to understand and interpret the recontextualisation process in the four lessons studied. In this research I was involved in the planning of the lessons with the Grade 7 Natural Science teacher. I taught one lesson as a demonstration and then observed while the teacher taught the other three lessons. I conducted this study as an action research case study. I used focus group interviews, classroom observations, document analysis and interviews as methods of data collection. The study found that the use of school gardens for teaching biodiversity can help with the recontextualisation of NCS in schools, and for the teaching of biodiversity, but that there is a need to understand and address various recontextualisation issues if this is to be done effectively. The study revealed that use of the school gardens for learning about biodiversity in the NS Learning Area is influenced by teachers’ knowledge, experience, teaching styles and available resources, as well as management issues and the complexity of the NCS discourse itself. The study also revealed that socio-cultural and structural factors (e.g. language and class size) also affect how biodiversity is taught in schools, and thus how the recontextualisation of the NCS takes place. The study concludes by making recommendations for taking this work forward in the context of our school as it addresses the gap that exists between policy and practice.
- Full Text:
- Date Issued: 2009
An investigation of the effects which using the word processor has on the writing of standard six pupils
- Authors: McKenzie, Donald John
- Date: 1994
- Subjects: Written communication -- Study and teaching -- Data processing Word processors in education Language arts -- Computer-assisted instruction English language -- Writing--Study and teaching
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1648 , http://hdl.handle.net/10962/d1003531
- Description: In order to discover to what extent the use of the word processor affects the motivation of high school students when engaged in writing tasks, and to determine the effects of the word processing on the length and quality of their work and editing, two groups, carefully matched in terms of prior computer experience, intelligence and language ability were given eight writing tasks. The test group used word processors while the control group used pen and paper. Their behaviour was closely observed and their writing was subsequently compared. It was found that while the test group were more motivated and spent longer both writing and editing their work, the quality of the work of both groups was similar. The degree of editing was greater for the test group. The conclusion is that there is a place for the use of the word processor in the English classroom, but specific strategies need to be developed to optimise its benefits.
- Full Text:
- Date Issued: 1994
- Authors: McKenzie, Donald John
- Date: 1994
- Subjects: Written communication -- Study and teaching -- Data processing Word processors in education Language arts -- Computer-assisted instruction English language -- Writing--Study and teaching
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1648 , http://hdl.handle.net/10962/d1003531
- Description: In order to discover to what extent the use of the word processor affects the motivation of high school students when engaged in writing tasks, and to determine the effects of the word processing on the length and quality of their work and editing, two groups, carefully matched in terms of prior computer experience, intelligence and language ability were given eight writing tasks. The test group used word processors while the control group used pen and paper. Their behaviour was closely observed and their writing was subsequently compared. It was found that while the test group were more motivated and spent longer both writing and editing their work, the quality of the work of both groups was similar. The degree of editing was greater for the test group. The conclusion is that there is a place for the use of the word processor in the English classroom, but specific strategies need to be developed to optimise its benefits.
- Full Text:
- Date Issued: 1994
An investigation on the effect of Russian wheat aphid (Diuraphis noxia Kurdjumov) population growth and feeding damage on selected barley (Hordeum vulgare L.) cultivars under ambient and elevated CO2
- Authors: Sacranie, Sattar Farouk
- Date: 2016
- Subjects: Russian wheat aphid -- Research -- South Africa Barley -- Disease and pest resistance -- South Africa Callose Aphids
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/50311 , vital:25975
- Description: The Russian wheat aphid (RWA) (Diuraphis noxia Kurdjumov) is a major pest of cultivated small grains. It is particularly devastating because of is high reproductive rate which results in the growth of large populations which become damaging to its host plants. Development of resistant barley (Hordeum vulgare L.) cultivars is complicated as resistance is polygenic. As a result, the industry remains at risk now that the RWA has spread throughout South Africa. It has, as recently as, 2013, been identified in the SW Cape, which was previously geographically isolated. This is South Africa‟s principle barley growing region. Now a potentially huge problem exists. Therefore, it is imperative that an alternative to pesticide use is found. Testing potential innate resistance in barley cultivars is thus, critical. In this thesis, I present data on four barely cultivars where I have examined their resistance/ lack of resistance to three known RWA biotypes, RWASA1, RWASA2 and RWASA3. The barley varieties used were two economically important South African malt barley cultivars (S5 and SSG 564) along with two potentially RWA resistant Afghan accessions (CIho 4125 and CIho 4159). The RWA biotype population growth rates on each of the plants were determined over a 14 day period. The aim was to establish baseline data of the effects of RWA population growth on the host plants under ambient CO2 (380 – 400 ppm) conditions. The extent of RWA feeding damage was investigated at the cell level by examining saliva deposition and cell disruption using Transmission Electron Microscopy; at the tissue/vascular level using fluorescence microscopy, to determine the extent of callose formation; at a whole leaf level by recording percent chlorosis and leaf roll; and finally, at a whole plant level by measuring biomass loss.The experiments were repeated under elevated CO2 (450 ppm) to model any changes in RWA/plant interaction with respect to future climate change. The effects of an elevated CO2 environment and RWA feeding on host plant foliar N and C:N ratio were compared to ambient CO2 conditions, to provide a clearer picture of the potential nutrient drain that a feeding RWA colony exacts on its host. Of the varieties tested, the CIho accessions performed better than the two SA barley cultivars as the CIho accessions appeared to express a mild antibiosis resistance response as RWA populations, particularly those of RWASA1, were smaller than those observed on either S5 or SSG 564. In addition, less damage was evident in the two CIho accessions due to RWA feeding. II RWASA2 was the most virulent of the three RWA biotypes tested, followed by RWASA3 while RWASA1 was the least virulent. Under elevated CO2 conditions, RWA feeding damage was exacerbated but the trend of biotype virulence remained the same. Higher aphid population sizes were recorded under elevated CO2, meant that even the more resistant CIho accessions were overcome by the increased demand made by the larger aphid colonies on the host plants. The % foliar N data showed that under elevated CO2 aphid-free control plants had increased N levels in their leaves. Increased “food” supply (as shown by the increased N levels) therefore allowed significantly larger aphid populations to develop on the plants exposed to elevated CO2, due to improved nutrient status of the phloem sap taken up by RWA. The knock-on effect of a higher aphid population was increased cell disruption as a result of extensive probing, extensive formations of wound callose, with the result that phloem damage impeded nutrient flow through the vascular tissues which contributed to chlorosis and (eventually plant) death. The major conclusion from this study is that even a mild CO2 elevation resulted in an increase aphid population which may pose a severe and very real threat to a barley crop. Therefore, without effort to identify and deploy resistant barley cultivars, it could well be possible that future barley cultivation in South Africa may no longer be viable.
- Full Text:
- Date Issued: 2016
- Authors: Sacranie, Sattar Farouk
- Date: 2016
- Subjects: Russian wheat aphid -- Research -- South Africa Barley -- Disease and pest resistance -- South Africa Callose Aphids
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/50311 , vital:25975
- Description: The Russian wheat aphid (RWA) (Diuraphis noxia Kurdjumov) is a major pest of cultivated small grains. It is particularly devastating because of is high reproductive rate which results in the growth of large populations which become damaging to its host plants. Development of resistant barley (Hordeum vulgare L.) cultivars is complicated as resistance is polygenic. As a result, the industry remains at risk now that the RWA has spread throughout South Africa. It has, as recently as, 2013, been identified in the SW Cape, which was previously geographically isolated. This is South Africa‟s principle barley growing region. Now a potentially huge problem exists. Therefore, it is imperative that an alternative to pesticide use is found. Testing potential innate resistance in barley cultivars is thus, critical. In this thesis, I present data on four barely cultivars where I have examined their resistance/ lack of resistance to three known RWA biotypes, RWASA1, RWASA2 and RWASA3. The barley varieties used were two economically important South African malt barley cultivars (S5 and SSG 564) along with two potentially RWA resistant Afghan accessions (CIho 4125 and CIho 4159). The RWA biotype population growth rates on each of the plants were determined over a 14 day period. The aim was to establish baseline data of the effects of RWA population growth on the host plants under ambient CO2 (380 – 400 ppm) conditions. The extent of RWA feeding damage was investigated at the cell level by examining saliva deposition and cell disruption using Transmission Electron Microscopy; at the tissue/vascular level using fluorescence microscopy, to determine the extent of callose formation; at a whole leaf level by recording percent chlorosis and leaf roll; and finally, at a whole plant level by measuring biomass loss.The experiments were repeated under elevated CO2 (450 ppm) to model any changes in RWA/plant interaction with respect to future climate change. The effects of an elevated CO2 environment and RWA feeding on host plant foliar N and C:N ratio were compared to ambient CO2 conditions, to provide a clearer picture of the potential nutrient drain that a feeding RWA colony exacts on its host. Of the varieties tested, the CIho accessions performed better than the two SA barley cultivars as the CIho accessions appeared to express a mild antibiosis resistance response as RWA populations, particularly those of RWASA1, were smaller than those observed on either S5 or SSG 564. In addition, less damage was evident in the two CIho accessions due to RWA feeding. II RWASA2 was the most virulent of the three RWA biotypes tested, followed by RWASA3 while RWASA1 was the least virulent. Under elevated CO2 conditions, RWA feeding damage was exacerbated but the trend of biotype virulence remained the same. Higher aphid population sizes were recorded under elevated CO2, meant that even the more resistant CIho accessions were overcome by the increased demand made by the larger aphid colonies on the host plants. The % foliar N data showed that under elevated CO2 aphid-free control plants had increased N levels in their leaves. Increased “food” supply (as shown by the increased N levels) therefore allowed significantly larger aphid populations to develop on the plants exposed to elevated CO2, due to improved nutrient status of the phloem sap taken up by RWA. The knock-on effect of a higher aphid population was increased cell disruption as a result of extensive probing, extensive formations of wound callose, with the result that phloem damage impeded nutrient flow through the vascular tissues which contributed to chlorosis and (eventually plant) death. The major conclusion from this study is that even a mild CO2 elevation resulted in an increase aphid population which may pose a severe and very real threat to a barley crop. Therefore, without effort to identify and deploy resistant barley cultivars, it could well be possible that future barley cultivation in South Africa may no longer be viable.
- Full Text:
- Date Issued: 2016
Assessing process safety action in selected South African oil companies
- Mashiloane, Mosebetsi Stanley
- Authors: Mashiloane, Mosebetsi Stanley
- Date: 2018
- Subjects: Industrial safety -- South Africa -- Management , Manufacturing processes -- South Africa -- Safety measures Petroleum industry and trade -- South Africa
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: http://hdl.handle.net/10948/22596 , vital:30017
- Description: The study was triggered by the number of process safety incidents that are taking place in South African oil companies. The impact of these process safety incidents has resulted in multiple fatalities, revenue loss, fires and explosions in the past. The problem is so immense that the process safety actions, coming from the process safety studies to prevent and mitigate these incidents have been ignored, not attended to, not implemented or not understood by the oil industries for the past 15-20 years. Hence the process safety incidents are still happening and the oil industry has not learnt from previous incidents.
- Full Text:
- Date Issued: 2018
- Authors: Mashiloane, Mosebetsi Stanley
- Date: 2018
- Subjects: Industrial safety -- South Africa -- Management , Manufacturing processes -- South Africa -- Safety measures Petroleum industry and trade -- South Africa
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: http://hdl.handle.net/10948/22596 , vital:30017
- Description: The study was triggered by the number of process safety incidents that are taking place in South African oil companies. The impact of these process safety incidents has resulted in multiple fatalities, revenue loss, fires and explosions in the past. The problem is so immense that the process safety actions, coming from the process safety studies to prevent and mitigate these incidents have been ignored, not attended to, not implemented or not understood by the oil industries for the past 15-20 years. Hence the process safety incidents are still happening and the oil industry has not learnt from previous incidents.
- Full Text:
- Date Issued: 2018
Assessment of rangeland condition and evaluation of farmers' perception in Njwaxa and Mbizana communal rangelands of the Eastern Cape, South Africa
- Authors: Ngcofe, Odwa Armstrong
- Date: 2016
- Subjects: Rangelands -- South Africa -- Eastern Cape Land tenure -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10353/13259 , vital:39627
- Description: This study was conducted to determine of rangeland condition in terms of botanical composition, soil nutrient composition, and also to evaluate farmers’ perception on rangeland condition and degradation in two communal villages Njwaxa and Mbizana in the Eastern Cape Province of South Africa in 2014. A Structured questionnaire consisting of close and open-ended questions was used to investigate farmers’ perceptions on range condition, land degradation, and their causes. Fifty households with livestock were randomly selected in two communal areas of Middledrift (i.e. Njwaxa and Mbizana). Respondents of 21 years and above were selected. For assessment of range condition three homogeneous vegetation units (HVU) were demarcated in all study sites, namely slope; valley and toplands were demarcated and sub-divided into four 100m x 50m replicates. In each replicate, four 100m transects were laid parallel to each other 25m apart 1m2 quadrant was systematically located four times along each transect for herbaceous vegetation and soil sampling. The step point method was employed to determine herbaceous species composition and basal cover. A 400m2 belt transect was used to determine woody vegetation composition, density and tree equivalents in each HVU. The germination method was employed for soil seed bank composition and plant density. The soil micro and macro nutrients (N, P, K OC, Ca, Mg, Zn, Cu and Mn) and pH were also analyzed The majority of the respondents were between the ages of 51-60 years. Most of the farmers had more cattle (38percent) than goats (32percent) and sheep (30percent). Livestock numbers were perceived to have declined over the previous 20 years by the majority of respondents (96percent). The respondents indicated that their rangelands were mainly used for browsing (1.37), fire wood (2.01), building and fencing (2.63) and medical purposes (3.66). All the respondents indicated that their rangelands were highly degraded. Sheet erosion (50percent) was perceived to be the major type of soil erosion indicator mentioned by the farmers, followed by gully erosion (29percent) and rill erosion (21percent). The rangeland was dominated by Increaser II (pioneer) (63.2 percent) grass species followed by Decreaser (mesophytes) species (26.3percent). Digitaria eriantha in the valley (53.5 percent) was significantly higher (p<0.05) than both in the top (10.5percent) and sloppy areas (33.5percent) at Njwaxa communal rangeland, the abundance of D. eriantha was significantly higher (p<0.05) than top and valley in Mbizana communal rangeland. The results showed that soil seed banks were dominated by perennials, followed by annuals and biennial species being least abundant. The dominant forb Jamebrittenia c.f. albanesis was significantly higher (p<0.05) in both slopes (6.65percent) and toplands (7.34percent) than in the valley (3.15). The second most dominant species Puesdognaphalium undulata was significantly higher (p<0.05) in topland areas (6percent) than in valley bottom (3.8percent) and sloppy areas (4.3percent). The results of soil nutrients revealed no significant differences (p>0.05) in the concentration of OC, Ca, and Mg between the communities and seasons. Phosphorus (P) was significantly higher (p<0.05) in winter (concentrations) in most of the sites, except the top sites of Mbizana where summer concentration of P was significantly higher than winter. Potassium (K) was significantly higher (p<0.05) in summer than in winter in most of the HVUs, except the topland areas of Njwaxa and Mbizana sloppy areas where there were no significant differences (p>0.05) in the concentration of K. Soil pH did not display any significant differences (p>0.05) between communities and sites. The mean soil pH recorded in this study was 5.4 implying the soils of Njwaxa and Mbizana communities were acidic. It is evident that communal farmers are well aware of their rangeland condition, changes occurring in their rangelands, their causes and are capable of suggesting some solutions in controlling the declining condition of the rangelands. This study has shown the importance of engaging farmers’ inputs in range assessment since those are people bearing the consequences of rangeland degradation.
- Full Text:
- Date Issued: 2016
- Authors: Ngcofe, Odwa Armstrong
- Date: 2016
- Subjects: Rangelands -- South Africa -- Eastern Cape Land tenure -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10353/13259 , vital:39627
- Description: This study was conducted to determine of rangeland condition in terms of botanical composition, soil nutrient composition, and also to evaluate farmers’ perception on rangeland condition and degradation in two communal villages Njwaxa and Mbizana in the Eastern Cape Province of South Africa in 2014. A Structured questionnaire consisting of close and open-ended questions was used to investigate farmers’ perceptions on range condition, land degradation, and their causes. Fifty households with livestock were randomly selected in two communal areas of Middledrift (i.e. Njwaxa and Mbizana). Respondents of 21 years and above were selected. For assessment of range condition three homogeneous vegetation units (HVU) were demarcated in all study sites, namely slope; valley and toplands were demarcated and sub-divided into four 100m x 50m replicates. In each replicate, four 100m transects were laid parallel to each other 25m apart 1m2 quadrant was systematically located four times along each transect for herbaceous vegetation and soil sampling. The step point method was employed to determine herbaceous species composition and basal cover. A 400m2 belt transect was used to determine woody vegetation composition, density and tree equivalents in each HVU. The germination method was employed for soil seed bank composition and plant density. The soil micro and macro nutrients (N, P, K OC, Ca, Mg, Zn, Cu and Mn) and pH were also analyzed The majority of the respondents were between the ages of 51-60 years. Most of the farmers had more cattle (38percent) than goats (32percent) and sheep (30percent). Livestock numbers were perceived to have declined over the previous 20 years by the majority of respondents (96percent). The respondents indicated that their rangelands were mainly used for browsing (1.37), fire wood (2.01), building and fencing (2.63) and medical purposes (3.66). All the respondents indicated that their rangelands were highly degraded. Sheet erosion (50percent) was perceived to be the major type of soil erosion indicator mentioned by the farmers, followed by gully erosion (29percent) and rill erosion (21percent). The rangeland was dominated by Increaser II (pioneer) (63.2 percent) grass species followed by Decreaser (mesophytes) species (26.3percent). Digitaria eriantha in the valley (53.5 percent) was significantly higher (p<0.05) than both in the top (10.5percent) and sloppy areas (33.5percent) at Njwaxa communal rangeland, the abundance of D. eriantha was significantly higher (p<0.05) than top and valley in Mbizana communal rangeland. The results showed that soil seed banks were dominated by perennials, followed by annuals and biennial species being least abundant. The dominant forb Jamebrittenia c.f. albanesis was significantly higher (p<0.05) in both slopes (6.65percent) and toplands (7.34percent) than in the valley (3.15). The second most dominant species Puesdognaphalium undulata was significantly higher (p<0.05) in topland areas (6percent) than in valley bottom (3.8percent) and sloppy areas (4.3percent). The results of soil nutrients revealed no significant differences (p>0.05) in the concentration of OC, Ca, and Mg between the communities and seasons. Phosphorus (P) was significantly higher (p<0.05) in winter (concentrations) in most of the sites, except the top sites of Mbizana where summer concentration of P was significantly higher than winter. Potassium (K) was significantly higher (p<0.05) in summer than in winter in most of the HVUs, except the topland areas of Njwaxa and Mbizana sloppy areas where there were no significant differences (p>0.05) in the concentration of K. Soil pH did not display any significant differences (p>0.05) between communities and sites. The mean soil pH recorded in this study was 5.4 implying the soils of Njwaxa and Mbizana communities were acidic. It is evident that communal farmers are well aware of their rangeland condition, changes occurring in their rangelands, their causes and are capable of suggesting some solutions in controlling the declining condition of the rangelands. This study has shown the importance of engaging farmers’ inputs in range assessment since those are people bearing the consequences of rangeland degradation.
- Full Text:
- Date Issued: 2016
Bio-prospecting a Soil Metagenomic Library for Carbohydrate Active Esterases
- Authors: Shezi, Ntombifuthi
- Date: 2016
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4172 , http://hdl.handle.net/10962/d1021266
- Description: Lignocellulosic biomass is a promising renewable resource on earth. Plant biomass contains fermentable sugars and other moieties that can be converted to biofuels or other chemicals. Enzymatic hydrolysis of these biopolymers is significant in the liberation of sugars for fermentation into desired products. Owing to its complex structure, synergistic action of enzymes is required for its degradation. Enzymes that are involved in biomass degradation include cellulases, hemicellulases and the accessory enzymes acetyl xylan esterases and ferulic acid esterases. Ferulic acid esterases (FAEs, EC 3.1.1.73), represent a subclass of carboxylester hydrolases (EC 3.1.1.-) that catalyse the release of hydroxycinnamic acids (such as ferulic acid, p-coumaric, ferulic, sinapic and caffeic acid) that are generally found esterified to polysaccharides, such as arabinoxylans. Hydroxycinnamic acids have widespread potential applications due to their antimicrobial, photoprotectant and antioxidant properties, as well as their use as flavour precursors. Therefore, this interesting group of FAEs has a potentially wide variety of applications in agriculture, food and pharmaceutical industries. In the search for novel biocatalysts, metagenomics is considered as an alternative approach to conventional microbe screening, therefore, searching for novel biocatalysts from a soil metagenome that harbours a unique diversity of biocatalyst is significant. The aim of this study was to extract DNA from soil associated with cattle manure and construct a soil metagenomic library using a fosmid based plasmid vector and subsequently functionally screen for ferulic acid esterases using ethyl ferulate as a model substrate. A total of 59 recombinant fosmids conferring ferulic acid esterase phenotypes were identified (Hit rate 1:3122) and the two fosmids that consistently showed high FAE activities were selected for further study. Following nucleotide sequencing and translational analysis, two fae encoding open reading frames (FAE9 and FAE27) of approximately 274 and 322 aa, respectively, were identified. The amino acid sequence of the two ORFs contained a classical conserved esterase/lipase G-x-S-x-G sequence motif. The two genes (fae9 and fae27) were successfully expressed in Escherichia coli BL21 (DE3) and the purified enzymes exhibited respective temperature optima of 50 °C and 40 °C, and respective pH optima of 6.0 and 7.0. Further biochemical characterisation showed that FAE9 and FAE27 have high substrate specificity, following the fact that EFA is the preferred substrate for FAE9 (kcat/Km value of 128 s−1.mM-1) and also the preferred substrate for FAE27 (kcat/Km value of 137 s−1.mM-1). This work proves that soil is a valuable environmental source for novel esterase screening through functional based metagenomic approach. Therefore, this method may be used to screen for other valuable enzymes from environmental sources using inexpensive natural sources to encourage the screening of specific enzymes. Biochemistry of the two isolated enzymes makes these enzymes to be useful in industrial applications due to broad substrate activity that could replace the specialised enzymes to complete plant biomass degradation.
- Full Text:
- Date Issued: 2016
- Authors: Shezi, Ntombifuthi
- Date: 2016
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4172 , http://hdl.handle.net/10962/d1021266
- Description: Lignocellulosic biomass is a promising renewable resource on earth. Plant biomass contains fermentable sugars and other moieties that can be converted to biofuels or other chemicals. Enzymatic hydrolysis of these biopolymers is significant in the liberation of sugars for fermentation into desired products. Owing to its complex structure, synergistic action of enzymes is required for its degradation. Enzymes that are involved in biomass degradation include cellulases, hemicellulases and the accessory enzymes acetyl xylan esterases and ferulic acid esterases. Ferulic acid esterases (FAEs, EC 3.1.1.73), represent a subclass of carboxylester hydrolases (EC 3.1.1.-) that catalyse the release of hydroxycinnamic acids (such as ferulic acid, p-coumaric, ferulic, sinapic and caffeic acid) that are generally found esterified to polysaccharides, such as arabinoxylans. Hydroxycinnamic acids have widespread potential applications due to their antimicrobial, photoprotectant and antioxidant properties, as well as their use as flavour precursors. Therefore, this interesting group of FAEs has a potentially wide variety of applications in agriculture, food and pharmaceutical industries. In the search for novel biocatalysts, metagenomics is considered as an alternative approach to conventional microbe screening, therefore, searching for novel biocatalysts from a soil metagenome that harbours a unique diversity of biocatalyst is significant. The aim of this study was to extract DNA from soil associated with cattle manure and construct a soil metagenomic library using a fosmid based plasmid vector and subsequently functionally screen for ferulic acid esterases using ethyl ferulate as a model substrate. A total of 59 recombinant fosmids conferring ferulic acid esterase phenotypes were identified (Hit rate 1:3122) and the two fosmids that consistently showed high FAE activities were selected for further study. Following nucleotide sequencing and translational analysis, two fae encoding open reading frames (FAE9 and FAE27) of approximately 274 and 322 aa, respectively, were identified. The amino acid sequence of the two ORFs contained a classical conserved esterase/lipase G-x-S-x-G sequence motif. The two genes (fae9 and fae27) were successfully expressed in Escherichia coli BL21 (DE3) and the purified enzymes exhibited respective temperature optima of 50 °C and 40 °C, and respective pH optima of 6.0 and 7.0. Further biochemical characterisation showed that FAE9 and FAE27 have high substrate specificity, following the fact that EFA is the preferred substrate for FAE9 (kcat/Km value of 128 s−1.mM-1) and also the preferred substrate for FAE27 (kcat/Km value of 137 s−1.mM-1). This work proves that soil is a valuable environmental source for novel esterase screening through functional based metagenomic approach. Therefore, this method may be used to screen for other valuable enzymes from environmental sources using inexpensive natural sources to encourage the screening of specific enzymes. Biochemistry of the two isolated enzymes makes these enzymes to be useful in industrial applications due to broad substrate activity that could replace the specialised enzymes to complete plant biomass degradation.
- Full Text:
- Date Issued: 2016
Contributing factors to academic success of children in foster care in Mount Fletcher, Eastern Cape
- Dladlama, Phumeza Buyiswa Lungelwa
- Authors: Dladlama, Phumeza Buyiswa Lungelwa
- Date: 2017
- Subjects: Foster children--Education
- Language: English
- Type: Thesis , Masters , Social Work
- Identifier: http://hdl.handle.net/10353/15111 , vital:40184
- Description: The researcher explored the contributing factors which lead to academic success of children in foster care in Mount Fletcher, Eastern Cape. Children in foster care are highly to drop out of school compared to their peers, and there are children in foster care who are academic successful despite the obstacle of foster care placement. The research study focused on the positive outcomes of children in foster care placements and the support structures that contributed to their academic success. Family support, school support, community support, religious support, professional support systems, resilience and protective factors were measured as the most prominent contributing factors that lead to academic success of children in foster care. The importance of a strong educational background for children in foster care cannot be overstated as the experiences of success that a child has in school can positively affect their psychological functioning well into adulthood. It was revealed that, although there are challenges, environmental disadvantages and stress that can lead to behavioural and psychological problems amongst children in foster care, there are children who overcome the difficulties to become well-adjusted adults. The study made use of Person Centred Approach as theoretical framework. The Person Centred Approach was relevant to the study as it uses the basic core conditions and propositions for positive therapeutic change and that it enables the participants’ establishment of congruence with organismic experiences. Data was collected by means of semi-structured interviews and focus group discussions. The sample was made up of 12 persons who exited foster care system and matriculated. The findings of the study revealed that, among the above listed contributing factors, family support, school support, community support and religious support were the most significant factors which contributed to the academic success of the participants. No significant relationship was found between the participants’ academic success and professional support. The study further revealed that a large number of children in foster care were cared for by their relatives, especially maternal grandparents. Due to the mentioned findings, it was recommended that the child placed in foster care placement from the age of 12 years, must be involved in the placement as there could be relatives whom the child is attached to. The social services professionals should play their role in supporting the children in foster care placements through proper monitoring of foster care placement and not to monitor the placement only during extension of foster care placement. Each government department has a role in moulding the child’s life and rendering support services.
- Full Text:
- Date Issued: 2017
- Authors: Dladlama, Phumeza Buyiswa Lungelwa
- Date: 2017
- Subjects: Foster children--Education
- Language: English
- Type: Thesis , Masters , Social Work
- Identifier: http://hdl.handle.net/10353/15111 , vital:40184
- Description: The researcher explored the contributing factors which lead to academic success of children in foster care in Mount Fletcher, Eastern Cape. Children in foster care are highly to drop out of school compared to their peers, and there are children in foster care who are academic successful despite the obstacle of foster care placement. The research study focused on the positive outcomes of children in foster care placements and the support structures that contributed to their academic success. Family support, school support, community support, religious support, professional support systems, resilience and protective factors were measured as the most prominent contributing factors that lead to academic success of children in foster care. The importance of a strong educational background for children in foster care cannot be overstated as the experiences of success that a child has in school can positively affect their psychological functioning well into adulthood. It was revealed that, although there are challenges, environmental disadvantages and stress that can lead to behavioural and psychological problems amongst children in foster care, there are children who overcome the difficulties to become well-adjusted adults. The study made use of Person Centred Approach as theoretical framework. The Person Centred Approach was relevant to the study as it uses the basic core conditions and propositions for positive therapeutic change and that it enables the participants’ establishment of congruence with organismic experiences. Data was collected by means of semi-structured interviews and focus group discussions. The sample was made up of 12 persons who exited foster care system and matriculated. The findings of the study revealed that, among the above listed contributing factors, family support, school support, community support and religious support were the most significant factors which contributed to the academic success of the participants. No significant relationship was found between the participants’ academic success and professional support. The study further revealed that a large number of children in foster care were cared for by their relatives, especially maternal grandparents. Due to the mentioned findings, it was recommended that the child placed in foster care placement from the age of 12 years, must be involved in the placement as there could be relatives whom the child is attached to. The social services professionals should play their role in supporting the children in foster care placements through proper monitoring of foster care placement and not to monitor the placement only during extension of foster care placement. Each government department has a role in moulding the child’s life and rendering support services.
- Full Text:
- Date Issued: 2017
Developing a problem solving approach to primary mathematics teaching: a case study
- Authors: Naidoo, Anandhavelli
- Date: 1992
- Subjects: Mathematics -- Study and teaching (Elementary) Problem solving -- Study and teaching (Elementary)
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1493 , http://hdl.handle.net/10962/d1003374
- Description: According to recent research a focus in teaching mathematics to children is the development of problem solving abilities. Problem solving means the process of applying mathematical knowledge and skills to unfamiliar situations. A case study was done using a problem solving approach to the learning and teaching of mathematics with a sample of teachers registered at the Umlazi College For Further Education. These teachers were familiar with the traditional approach of teaching mathematics through drill and practice methods. The new syllabus that is to be implemented emphasises a problem solving approach to the teaching of mathematics. This study set out to implement a problem solving approach with primary school mathematics teachers so that they would be someway prepared for the innovations of the new syllabus. Workshops were conducted using an action research approach with discourse and practice leading to reconstruction with improvements. Early theorists like Piaget and Bruner offered ways of understanding children's learning, to help the teacher develop his teaching. Dienes introduced an element of play and Dewey spoke of the importance of experience. Dienes and Dewey show the first positive signs of recognising the importance of social interaction in the learning situation. Social interaction lays emphasis on language and discussion in the mathematics classroom. A social constructivist model of teaching and learning was used for the research. This research includes a study of the established ideas on developing a problem solving approach to mathematics teaching. These ideas were incorporated into the workshops that the group of teachers attended. During the workshops teachers were gradually exposed to the essence of problem solving techniques through much group discussion and doing practical exercises, which they could then implement in their classes. The teachers reported back at each subsequent workshop. A non-participant observer evaluated the development at the workshops. The workshops' success was evident from the change in the teachers' attitudes and behaviour as well as their feedback of what transpired in the classroom. They reported on the change in their roles as information suppliers to facilitators where the thinking process was focused on, rather than the importance of a correct answer. In the workshops the teachers themselves moved from passive listeners to active participants. It would appear from this preliminary investigation that through using a problem solving approach in workshops, inservice teachers can benefit constructively from this approach and will attempt to use it in their own teaching.
- Full Text:
- Date Issued: 1992
- Authors: Naidoo, Anandhavelli
- Date: 1992
- Subjects: Mathematics -- Study and teaching (Elementary) Problem solving -- Study and teaching (Elementary)
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1493 , http://hdl.handle.net/10962/d1003374
- Description: According to recent research a focus in teaching mathematics to children is the development of problem solving abilities. Problem solving means the process of applying mathematical knowledge and skills to unfamiliar situations. A case study was done using a problem solving approach to the learning and teaching of mathematics with a sample of teachers registered at the Umlazi College For Further Education. These teachers were familiar with the traditional approach of teaching mathematics through drill and practice methods. The new syllabus that is to be implemented emphasises a problem solving approach to the teaching of mathematics. This study set out to implement a problem solving approach with primary school mathematics teachers so that they would be someway prepared for the innovations of the new syllabus. Workshops were conducted using an action research approach with discourse and practice leading to reconstruction with improvements. Early theorists like Piaget and Bruner offered ways of understanding children's learning, to help the teacher develop his teaching. Dienes introduced an element of play and Dewey spoke of the importance of experience. Dienes and Dewey show the first positive signs of recognising the importance of social interaction in the learning situation. Social interaction lays emphasis on language and discussion in the mathematics classroom. A social constructivist model of teaching and learning was used for the research. This research includes a study of the established ideas on developing a problem solving approach to mathematics teaching. These ideas were incorporated into the workshops that the group of teachers attended. During the workshops teachers were gradually exposed to the essence of problem solving techniques through much group discussion and doing practical exercises, which they could then implement in their classes. The teachers reported back at each subsequent workshop. A non-participant observer evaluated the development at the workshops. The workshops' success was evident from the change in the teachers' attitudes and behaviour as well as their feedback of what transpired in the classroom. They reported on the change in their roles as information suppliers to facilitators where the thinking process was focused on, rather than the importance of a correct answer. In the workshops the teachers themselves moved from passive listeners to active participants. It would appear from this preliminary investigation that through using a problem solving approach in workshops, inservice teachers can benefit constructively from this approach and will attempt to use it in their own teaching.
- Full Text:
- Date Issued: 1992