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Effects of nitrogen and phosphorus rates, leaf age and drying technique on growth and nutritional contents of Moringa oleifera

  • Authors: Sokombela, Asanda
  • Date: 2019
  • Subjects: Moringa
  • Language: English
  • Type: Thesis , Masters , MSc
  • Identifier: http://hdl.handle.net/10353/12117 , vital:39153
  • Description: In general, smallholder farmers tend to use large quantities of soil nutrients without replenishment with manure, compost and fertiliser in order to replace the soil nutrients that are lost. Considering the low soil fertility status of soils in South Africa, this study was conducted with an aim of developing agronomic protocols for the production of moringa in order to fight malnutrition and produce supplement feed for animals. Moringa contains various nutrients and chemicals, such as, protein, which are sensitive to heat, and there is therefore a need to establish the best drying method which does not affect the nutrient content and quality of moringa. Physiological age is probably the most important factor influencing the mineral composition of plants. The relationship between nutrient concentration and leaf age is not fundamentally altered by crop load, soil type, climate or cultural practices, such that nutrients may be displaced vertically by the level of supply. Leaf age is one of the factors that affect the distribution of nutrients in the leaves of plants. Therefore, studies were conducted to evaluate the response of Moringa oleifera leaf yield and nutritional content to nitrogen and phosphorus rates, leaf age/position, and drying techniques. The experiments were conducted at the University of Fort Hare Alice Campus research farm. The experiment that investigated the effect of N and P rates was carried out in potted plants filled fine silica sand. The seeds were sown on black polythene bags, filled with a mixture of soil, pine bark and goat manure (at 1:2:1 ratio, respectively) at a depth of 2 cm. At 30 cm height, the seedlings were transplanted into 5-liter pots, which were filled with building sand as growing media. The experiment was a 4 x 3 factorial, with four levels of nitrogen (100, 200, 300 and 400 kg/ha) and three levels of phosphorus (40, 80 and 120 kg/ha). The experiment was laid-out as randomised complete block design (RCBD), with 12 treatment combinations replicated four times. All experimental units received the same amount of potassium (731kg/ha) in the form of KCl. Nitrogen treatments which were applied were split in two equal applications, at transplanting stage and 4 weeks later. The phosphorus rates were applied as superphosphate once mixed to the potting media before transplanting. Growth parameters such as plant height, root collar diameters, number of leaves, dry and fresh leaf masses were measured. Powdered dry leaves were also analysed to determine iv metabolite such as crude protein, ash, moisture, fat and fibre constituents (ADF and NDF). Micro and macro mineral nutrients were also determined using atomic absorption spectroscopy technique (AAS). The results showed that growth of moringa significantly increased through the application of fertilizer. The results from the (ANOVA) table showed no interaction between phosphorus and nitrogen on growth parameters such as number of leaves, stem width and plant height of moringa in this study. Nitrogen levels, as treatments, have significantly affected the growth of the plant. However, phosphorus, as a treatment, showed no significant difference on growth parameteres of Moringa. It was evident that trees that received the highest nitrogen rate (400 kg/ha) resulted in thickest stem girth, tallest trees and the highest number of leaves. The overall results revealed that moringa leaf powder contained appreciable amount nutrients. Crude protein was notably high (38.23%) in the trees that received the highest phosphorus and nitrogen combination treatment (400 kg/ha N x 120 kg/ha P treatment combination. The highest ash content of (14.17%) and (14.21%) were recorded from the trees that received treatment combination of 200 kg/ha N x 80 kg/ha P and 100 kg/ha N x 120 kg/ha P, and significantly differed from the rest of the other treatment combinations. The fat content steadily increased with an increase in nitrogen rate. Increase in P level resulted in a decrease in fat content. The overall findings confirm that combinations of the higher levels of N and P result in a decrease in fat content. The variation in the metabolite nutrients and mineral nutrient values may be due to differences in age of the leaves or positions and possibly due to different stages of maturity of leaves. The second experiment was conducted in the field at the research farm. The aim was to evaluate the effect of leaf age/position on nutrient distribution of moringa. The seeds were sown in black polythene bags at a depth of 2 cm. The bags were filled with a mixture of 1 part of soil, 2 parts of pine bark: and 1 part of manure. The seedlings were transplanted into the field when they reached the height of 30cm. Plants were laid-out as a CRD design with 5 replications. Three leaf positions, upper, middle and basal leaves, were used as treatments to determine the nutrient variation within a parent plant. Leaves of each position were harvested separately, washed with tap water and air-dried in shade condition. The dried leaves were analysed for metabolite and mineral content. The Association of official agricultural chemists (AOAC) methods were used to determine protein, fat, fibre, and ash. Atomic absorption spectrometry (AAS) technique was used to analyse minerals v such as iron, zinc, copper, manganese and macro-minerals such as calcium, magnesium, potassium, sodium and phosphorus. The study showed that ash, fat, NDF and ADF contents were significantly higher in the basal leaves as compared to that in the middle and upper leaves. However, moisture and crude protein contents were significantly higher in the upper leaves compared to both in the middle and basal leaves. The basal leaves accumulated significantly higher Ca, Mg, K, Na and Mn contents. The concentrations of P, Zn, Cu and Fe were, on the other hand, significantly higher in the younger leaves compared to that in the middle and basal leaves. It can be concluded that the upper (younger) leaves contain enough nutrition to satisfy the dietary requirements. In addition, these leaves have low levels of oxalate, cyanide and nitrate, which can cause health problems. To determine the effect of drying method on nutrition content of moringa leaves, three drying methods (shade-, sun- and oven-drying methods) were applied as treatments. Moringa plants were grown at the Research Farm of the University of Fort Hare, Alice campus. The leaves were harvested, thoroughly mixed, washed with tap water and put into 15 brown paper bags. The 15 samples (paper bags) were distributed to the three drying treatments (each treatment replicated 5 times). The dried samples were analysed for metabolites and mineral content as per AOAC and AAS methods, respectively. The study showed that shade-drying method retained higher metabolites. Thus, this study recommends the shade-drying method in preserving moringa leaves.
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  • Date Issued: 2019

Smallholder farmers' selection criteria of maize varieties in Eastern Cape Province (Implications for adoption of GM maize) : the case of Port St. Johns, Flagstaff and Mqanduli

  • Authors: Ngcinela, Siphokazi
  • Date: 2018
  • Subjects: Genetically modified foods
  • Language: English
  • Type: Thesis , Masters , MSc
  • Identifier: http://hdl.handle.net/10353/10178 , vital:35372
  • Description: Different maize varieties are produced by smallholder farmers in Eastern Cape Province in different agro ecological zones. Government cropping programmes have been promoting the production of GM maize varieties by smallholder farmers to enhance food security. However, there is no evidence to show how smallholder farmers are selecting the maize varieties they want to produce. On the other hand, smallholder farmers are slowly adopting GM maize due to number of factors affecting them. The study adopted Cross sectional design to collect the data from smallholder farmers from the three study sites. The sample size was 704 respondents. A semi structured questionnaire was used to collect primary data from smallholder farmers in Mqanduli (Lowest rainfall), Flagstaff (moderate rainfall) Port St. Johns LM (highest rainfall), under OR Tambo DM. Multistage sampling was utilised. SPSS version 24 was used to analyse descriptive statistics and Multinomial logistic regression model. STATA version 13 was used to analyse Crag’s double hurdle model. The results showed that, farmers were producing GM maize (Ht and Bt), unimproved OPV (landrace) and improved OPV (Sahara). The majority of farmers were producing OPVs. The findings further showed that, the selection of GM maize varieties is positively related to maize threat stalk borer damage. The results indicated that, most of the respondents were not aware of the GM permit conditions thus, they failed to comply with the expected conditions. The following variables influenced the adoption and intensity of adoption of GM maize: gender, highest educational level, household size, employment status, access to land, access to market, access to credit, membership to farmers group, main source of income, farm size, and access to extension services. It was concluded that from the three study areas different maize varieties were produced. Adoption of GM maize was influenced by the number of factors. GM maize permit condition were not met by smallholder farmers. It was recommended that, research should be done on OPVs which are the most preferred varieties by smallholder farmers. Extension officers and those who are adopting GM maize should be educated and trained about GM maize permit conditions.
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  • Date Issued: 2018

Mitigation of the effect of father imprisonment on the family: a study of social work intervention strategies in Raymond Mhlaba local municipality

  • Authors: Tshaka, Akhona
  • Date: 2016
  • Subjects: Social work with single parents Single mothers -- South Africa -- Eastern Cape Single parents -- South Africa -- Eastern Cape Single-parent families -- South Africa -- Eastern Cape
  • Language: English
  • Type: Thesis , Masters , Degree
  • Identifier: http://hdl.handle.net/10353/4435 , vital:28334
  • Description: The South African population is highly populated by single mothered families. Fatherlessness has emerged as one of the greatest social problems, especially as children who grow up in families with absent-fathers suffer lasting damage. The aim of this study was to examine the effect of fathers’ imprisonment on the functioning of the family and social work interventions to mitigate the effect. The study used mixed method research design. Data was collected through the use of questionnaires and in-depth interviews. This study employed three sampling strategies; namely multi-stage sampling and purposive sampling as well as snow-ball sampling. The sample was made up of 65 members of families whose father is in prison or had been to prision and 15 social work officials. Qalitative data was analyised using themes and parrtens that emerged during interviews with participants, quantitative data was analysed using SPSS computer softerwere. Findings revealed that father’s imprisonment has negative impact that causes dysfunctional families. The negative effect is due to the loss of a father figure and a provider of the family. Inequality and stigmatisation among family members were also found to cause dysfunctional families after the father’s imprisonment. Findings from social work officials revealed social service interventions to mollify the family dysfunctions. However, majority of families are provided services through offender re-integration, others lack unawareness regarding social work interventions for families with fathers in prison. Findings further reveal that resources are limited to enhance the provision of adequate and better psychosocial support for affected families in order to alleviate the undesirable impact of father’s imprisonment. There is therefore a compelling need for implementing policies that will enable dysfunctional families with fathers imprison to access adequate psychosocial support services. The study also recommended that, social welfare system should be strengthened by embarking on enlightenment programmes that create awareness about family based interventions for dysfunction families with fathers in prison.
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  • Date Issued: 2016

User experience factors for mobile banking adoption: South African case study

  • Authors: Louw, Jacques Gerrit
  • Date: 2016
  • Subjects: Consumer satisfaction -- South Africa , Banks and banking -- Technological innovations -- South Africa , Mobile commerce -- South Africa , Telecommunication -- South Africa -- Finance
  • Language: English
  • Type: Thesis , Masters , MTech
  • Identifier: http://hdl.handle.net/10948/39207 , vital:35059
  • Description: Smartphone devices are driving the transformation of online banking to satisfy the needs and desires of the consumer. This has led South African commercial banks to launch mobile banking applications on smartphones to enhance the growth of the economy and to provide more opportunities to improve the deprived sector of the economy, at acceptable rates. Moreover, opportunities exist for revenue growth, such as the delivery of greater real-time access to products and the offering of a wide variety of banking services. South African commercial banks could realise opportunities for economical and revenue growth should they focus on specific criteria that could enhance mobile banking adoption. Such criteria could not until recently, be realised by commercial banks in South Africa as the adoption rate of mobile banking remained low at 9%. Numerous South African studies have attempted to determine factors that could enhance mobile banking adoption in South Africa. There is, however, a lack of South African studies attempting to identify user experience factors that could enhance mobile banking adoption in South Africa. User experience refers to the subjective feeling of the user that results from their interaction or intention to interact with a product, to perform a specific task in a specific environment. One of the most important components for the success of any product is a positive user experience. When the user interface and functionality of a product match the expectations of the users and make the users effective and efficient, feel safe and attain some level of self-worth from using or possessing the product, their interaction with the product becomes more satisfactory. Consequently, the importance of designing for a positive user experience opens up the potential for identifying potential user experience factors that could enhance mobile banking adoption in South Africa. The user experience factors identified in this study infer their components from the user experience aspect of persuasive design and its elements, namely persuasion and trust, that led to the emergence of scarcity, reciprocation and security factors that could enhance mobile banking adoption in South Africa. A case study was employed to confirm the factors that could enhance mobile banking adoption in South Africa. The findings from the case study and the extensive literature review culminated in a set of user experience factors that in future could enhance the adoption of mobile banking in South Africa.
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  • Date Issued: 2016

Environmental citizenship in citizen science: a case study of a volunteer toad conservation group in Noordhoek, South Africa

  • Authors: Van Wyk, Sheraine Maud
  • Date: 2015
  • Subjects: Toad NUTS (Noordhoek, South Africa) , Environmental education -- South Africa -- Noordhoek , Environmental education -- Citizen participation , Social learning -- South Africa -- Noordhoek , Toads -- Conservation -- South Africa -- Noordhoek , Toads -- Conservation -- Citizen participation
  • Language: English
  • Type: Thesis , Masters , MEd
  • Identifier: vital:2048 , http://hdl.handle.net/10962/d1017359
  • Description: The endangered Western Leopard Toad (Amietophrynus pantherinus) is endemic to the winter-rainfall parts of the Western Cape, areas which are also favoured for human settlement. Residents in the Noordhoek area witnessed many toads being killed on roads during their annual migration to breeding ponds. Concerned citizens mobilised a volunteer group to mitigate this threat to the species. Toad NUTS (Noordhoek Unpaid Toad Savers), a well-established and successful citizen science group is explored as a case study of how environmental citizenship emerges in a citizen science group. This research has three research goals. Firstly to probe the enabling and constraining factors shaping the Toad NUTS practices, secondly to investigate the learning dynamics in the citizen science group and thirdly to understand how participation in citizen science develops environmental citizenship. Practice architectures theory (Kemmis & Grootenboer, 2008) was used to explore how cultural-discursive, economic-material and social-political arrangements shape the practices of the Toad NUTS group. The Toad NUTS group was identified as a community of practice, therefore Lave and Wenger’s (1991) communities of practice theory was used to better understand the social learning processes within the group. The Global Citizenship Education international policy document was used to capture the aims of citizenship education as it relates to environmental issues and identifies the competencies that citizenship education initiatives should develop. The practices of the Toad NUTS group were investigated for evidence of the goals and competencies identified in the Global Citizenship Education policy documents of environmental citizenship. Data was generated through documentary research, surveys, a questionnaire, semi-structured interviews and observations. The data was stored, organised and analysed using NVivo data management software in three phases corresponding to the three research goals. With respect to Goal 1, the evidence suggested that there are various shaping arrangements of cultural-discursive, material-economic and social-political configurations which influence Toad NUTS practices. Volunteers must learn to navigate these arrangements in order to successfully implement conservation strategies. The shaping features identified were the WhatsApp group communication system used by volunteers; public awareness and education strategies; equipment, material and funding required for implementing the group’s practices; power balances and exchanges between stakeholders in the conservation field; bureaucratic processes and scientist-lay person exchanges. Very important for facilitating social-political connections to various stakeholders, is the membership Toad NUTS enjoys on the Western Leopard Toad Conservation Committee. With respect to Goal 2, four interconnected components of learning were investigated. These were: learning as belonging, learning as doing, learning as meaning-making experience and learning as becoming. Members learn by doing things together like training, patrolling and deliberating problems in the field. They learn by exploring what is collectively known from past and unfolding experiences. Evidence showed that learning deepens as Toad NUTS members perceive their praxis as meaningful and their identities evolve as their knowledge and experience grows. This strengthens members’ sense of belonging and identification with the Toad NUTS group. In time the group develops a reputation and the wider community acknowledges the expertise and knowledge that resides with the group. With respect to Goal 3, it was found that volunteers who have a predisposition for environmental citizenship are more likely to join a citizen science group. Although volunteers care about nature and want to make a difference, it is after gaining access to the embedded knowledge and knowledge processes of the citizen science group that they realise meaningful sustainable solutions to the issue(s) that the project is concerned with. It was found that knowledge paired with reasoned practice enables the agency of volunteers to bring about positive and meaningful change in the local environment. If facilitated carefully, citizen science can make positive contributions to the field, in this instance, conservation, while allowing volunteers to exercise environmental citizenship engaging in participative governance with regard to the project.
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  • Date Issued: 2015

Understanding how Grade 11 life sciences teachers mediate biodiversity concepts in a second language context : a case study

  • Authors: Gqoloqa, Zingisa
  • Date: 2015
  • Subjects: Life sciences -- Study and teaching (Secondary) -- South Africa -- Eastern Cape , Language and education
  • Language: English
  • Type: Thesis , Masters , MEd
  • Identifier: vital:2028 , http://hdl.handle.net/10962/d1017339
  • Description: This research focused on an investigation of the pedagogy and strategies used by Grade 11 Life Sciences teachers when mediating Biodiversity concepts with English second language learners. My interest in this investigation was triggered by the Examiners’ Reports for Life Sciences from 2009 to 2012 which consistently noted learner challenges in answering, interpreting and analysing questions during exams. The reports highlighted learners’ lack of understanding of the questions which led to them providing irrelevant information in their exam scripts. These reports claimed that challenges experienced by these learners could be attributed to language issues experienced by English second language learners. Influenced by these reports, a qualitative case study of two Senior Secondary schools in East London, Eastern Cape South Africa was conducted. Underpinned by an interpretive paradigm and driven by the desire to achieve an in-depth understanding of the case under study, three phases of information gathering were followed. The first phase was that of gathering information through document analysis. Documents were analysed to gain insights and understanding of the issue before conducting interviews. The next phase was that of gathering information through semi-structured interviews followed by classroom observations. Findings from these observations were verified through stimulated recall interviews which provided clarity on the intentionality of choosing a certain method and strategy over another when assisting learners in making meaning of biodiversity concepts. The main findings of this study are that factors which limit learner understanding of biodiversity concepts are a result of a combination of factors such as failure to interpret questions, spelling problems which alter meaning of concepts and an inability to make distinctions among closely related concepts within the topic of Biodiversity. Responding to these factors, teachers demonstrated knowledge of a variety of teaching strategies to support learners. The choice of teaching strategies seemed to be guided by their experiences as well as the challenges they often encounter. Furthermore, teachers’ reflections on their practice provided opportunities for them to identify strengths and limitations of their choice of strategies and possibilities for improvement. It was also noted that factors such as large class sizes, gaps in content knowledge and a lack of detail in chalkboard summary limited the effectiveness of their teaching strategies. The study recommends that: • Teacher-learner ratio needs to be considered for effective support; • There is still a need to capacitate educators in environmental education. In-service training should focus on developing teacher understanding of foundational knowledge in life sciences; and • Teachers need to improve their chalkboard summary skills to increase the level of support that could be provided by comprehensive chalkboard summary through the elaboration of ideas
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  • Date Issued: 2015

Investigation of the NFC technology for mobile payments and the development of a prototype payment application in the context of marginalized rural areas

  • Authors: Gurajena, Caroline
  • Date: 2014
  • Subjects: Mobile commerce -- South Africa Mobile communication systems -- South Africa
  • Language: English
  • Type: Thesis , Doctoral , DPhil
  • Identifier: http://hdl.handle.net/10353/14071 , vital:39802
  • Description: The Internet of Things (IoT) environment involves the interaction of numerous ‘things’. These ‘things’ are embedded with different kinds of technologies such as RFID technology, NFC technology and sensors. This causes IoT to bring into play many security risks apart from the ones that already exist in the current Internet, for example, embedded RFID tags can be easily triggered and send their content which could be private information. IoT also introduces internal attacks such as on-off attack, bad mouthing and white washing attacks into networks that already exist. These internal attacks cannot be solved by hard security mechanisms such as cryptographic algorithms and firewalls because they guarantee total trust. This eliminates uncertainty which should always be available where trust exist. That is, hard security mechanisms enable IoT ‘things’ to either trust another ‘thing’ completely or not and this makes them unsuitable for the IoT environment. When objects in any network are communicating, there is some element of uncertainty. Also, hard security mechanisms such as public key cryptography cause communication overheard in the already resource-constrained IoT devices and these conventional cryptography methods cannot deal with internal attacks. This brings about the need for a middleware that includes functions that will manage trust, privacy and security issues of all data exchange, communications and network connections. For IoT to be successful, the provision of trust, security and privacy measures are essential. Trust management may enhance the adoption and security measures in IoT. Trust helps in identifying trustworthy ‘things’ in the network and give ‘things’ in the network the ability to reason in all aspects concerning trust in the environment. Trust can be administered through a trust management model. This research notes that most of the trust models that have been proposed fail to address scalability challenges and lack suitable computation methods. It is on that premise that this research focuses on developing a suitable trust model for the IoT environment. The research also introduces new ways of creating relationships in IoT. This enables the creation of new cooperation opportunities in the environment. In overall, this research aimed to design and develop a generic trust and authority delegation model for the heterogonous IoT environment that is scalable and generalized to cater for the heterogeneous IoT environment. This research was conducted in three phases. The first phase reviewed literature in order to identify outstanding issues in IoT trust management and also identify the suitable computational method. This provided a critical analysis of different computational methods highlighting their advantages and limitations. In the second phase of the research, the proposed trust model was designed and tested. In the last phase, the feasibility of the proposed model was evaluated. The proposed model is based on fuzzy logic. Fuzzy logic was selected for trust computation because it is able to imitate the process of the human mind through the use of linguistic variables and it can handle uncertainty. The proposed model was tested in a simulated environment. The simulation results showed that the proposed model can identify selfish and malicious entities effectively. The results also showed that the model was able to deal with different types of behaviours of entities. The testing proved that the proposed trust model can support decision making in IoT based on trust. The results from the evaluation show that this research ameliorates the design and development of trust management solutions for the IoT environment.
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  • Date Issued: 2014

The impact of an in-depth code comprehension tool in an introductory programming module

  • Authors: Leppan, Ronald George
  • Date: 2008
  • Subjects: Algorithms , Computer programming , Algorithms -- Study and teaching -- South Africa , Visual perception
  • Language: English
  • Type: Thesis , Masters , MSc
  • Identifier: vital:10471 , http://hdl.handle.net/10948/847 , Algorithms , Computer programming , Algorithms -- Study and teaching -- South Africa , Visual perception
  • Description: Reading and understanding algorithms is not an easy task and often neglected by educators in an introductory programming course. One proposed solution to this problem is the incorporation of a technological support tool to aid program comprehension in introductory programming. Many researchers advocate the identification of beacons and the use of chunking as support for code comprehension. Beacon recognition and chunking can also be used as support in the teaching model of introductory programming. Educators use a variety of different support tools to facilitate program comprehension in introductory programming. Review of a variety of support tools fails to deliver an existing tool to support a teaching model that incorporates chunking and the identification of beacons. The experimental support tool in this dissertation (BeReT) is primarily designed to encourage a student to correctly identify beacons within provided program extracts. BeReT can also be used to allow students to group together related statements and to learn about plans implemented in any semantically and syntactically correct algorithm uploaded by an instructor. While these requirements are evident in the design and implementation of BeReT, data is required to measure the effect BeReT has on the indepth comprehension of introductory programming algorithms. A between-groups experiment is described which compares the program comprehension of students that used BeReT to study various introductory algorithms, with students that relied solely on traditional lecturing materials. The use of an eye tracker was incorporated into the empirical study to visualise the results of controlled experiments. The results indicate that a technological support tool like BeReT can have a significantly positive effect on student comprehension of algorithms traditionally taught in introductory programming. This research provides educators with an alternative way for the incorporation of in-depth code comprehension skills in introductory programming.
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  • Date Issued: 2008

Towards a post-sacrificial theory of identity formation

  • Authors: Menezes, Natalie
  • Date: 2006
  • Subjects: Sacrifice -- Philosophy , Violence -- Philosophy , Forgiveness -- Philosophy , Philosophy -- Africa
  • Language: English
  • Type: Thesis , Masters , MA
  • Identifier: vital:2862 , http://hdl.handle.net/10962/d1007626 , Sacrifice -- Philosophy , Violence -- Philosophy , Forgiveness -- Philosophy , Philosophy -- Africa
  • Description: In this thesis I shall outline various modernist authors' arguments that collectivities (such as ethnic groups, nations, states and cultures) and subjectivities employ sacrificial violence to establish and assert their identity where identity is inescapably (?) understood in terms of the sovereignty of the collective or the post-Oedipal autonomy of the individual. To this end, violence has been posited as a historical and conceptual inevitability and is set as the default-state of human nature and politics. In recent times, protesting voices (from post-feminist, post-colonial, post-modern and the emerging human rights discourses) have begun to rigorously contest the notion of violence as the default-state. As a result, the legitimacy of sacrifice as the primary modus to an autonomous selfhood has been radically problematised. I believe that a comprehensive understanding of the nature of this crisis of identity formation , and the possibility of transcending it, is to be found in the paradigmatic shift away from Newtonian thought toward a post-Newtonian worldview. In seeking to challenge the assumption of violence-as-default, I shall translate the comprehensive sacrificial nature of collective identity and subjectivity into a complexity-based model that allowed me to make three crucial conceptual moves toward a comprehensive understanding of post-sacrificial identities that occupy an important place in a post-Newtonian world. First, it will allow me to challenge the assumptions that supported the Hobbesian myth of autonomy/sovereignty sacrificially achieved by charting the ontological shift that compels us to understand "entities" (be it a cell, an individual or a state) not in terms of autonomy but interdependence. Secondly, it provides the conceptual tools needed to understand the systemic nature of sacrificial violence by reading subjectivity violence and collectivity violence in terms of their organic self-similarity. This will equip me to comprehensively explore a postsacrificial epistemology valid for both collective identities and subjectivity. Thirdly, I propose a model of post-sacrificial identities that are created and sustained at the edge of chaos through the dynamic interplay of order and disorder that reconciles creative and destructive forces in a generative unity. I believe that this post-Newtonian reading will clear the conceptual space needed to suggest there might yet be hope for a future that does not embrace violence as default-state.
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  • Date Issued: 2006

An exploration of understandings and expectations around differentiation in mathematics, science and technology education

  • Authors: Cherub, Fauzia
  • Date: 2005
  • Subjects: Education -- South Africa Educational evaluation -- South Africa Comparative education Mathematics -- Study and teaching -- South Africa Science -- Study and teaching -- South Africa Technology -- Study and teaching -- South Africa Education and state -- South Africa Differentiation (Sociology) Competency-based education -- South Africa
  • Language: English
  • Type: Thesis , Masters , MEd
  • Identifier: vital:1947 , http://hdl.handle.net/10962/d1008179
  • Description: The exploratory study presented in this thesis is a case study, interpretive in nature and located in the qualitative paradigm. The conceptual focus is on differentiation, recognizing that learners vary from one another and so will need educators to consider a wide range of factors to enable learners to learn. The objectives of the study are: • To identify what Whole School Evaluation (WSE) supervisors understand by the term differentiation (conceptual) • To identify how WSE supervisors expect differentiation to be achieved by educators (conceptual). [n order to contextualise this research, a further objective was considered necessary: • To identify the roles of WSE supervisors (contextual) This was set in the context of mathematics, science and technology education. The study was carried out with a group of ten WSE supervisors who were involved in evaluating Mathematics, Science and or Technology education in the GET (General Education and Training) Band. Analysis of questionnaires and documents led to the identification of supervisory roles, while analysis of semi-structured interviews revealed a range of dimensions related to differentiation understandings and expectations. These dimensions have been developed into a typology which is then drawn upon in the development of a new conceptual model of differentiation, particularly relevant to the South African context. Findings presented in the study represent an attempt to understand and make recommendations related to policy, practice, research, curriculum and learning support material (LSM) development, training and evaluation. Textual layering in the form of reflective footnotes and issue boxes. plus specific reflective sections in the main text e.g. limitations and assumptions, help the text to achieve this goal. While the study was focused on the context of mathematics, science and technology education, it became apparent that the findings could be applied across all the learning areas.
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  • Date Issued: 2005

Observed metabolic changes in male Wistar rats after treatment with an antidepressant implied in undesirable weight gain, or Sutherlandia frutescens for Type II diabetes

  • Authors: Chadwick, Wayne
  • Date: 2003
  • Subjects: Rats -- Metabolism , Non-insulin-dependent diabetes -- Research , Rats as laboratory animals
  • Language: English
  • Type: Thesis , Masters , MSc
  • Identifier: vital:11068 , http://hdl.handle.net/10948/313 , Rats -- Metabolism , Non-insulin-dependent diabetes -- Research , Rats as laboratory animals
  • Description: Type II diabetes is fast becoming a growing problem in developed countries worldwide. Traditionally the median age for diagnosis was around sixty, but recent surveys have shown that the entire age distribution curve has shifted to the left. Western countries boast the worst statistics in which type II diabetes is being reported in children under the age of ten. At such a young age the disease often goes undiagnosed for long periods of time allowing considerable damage to occur. The incidence of type II diabetes is thought to be parallel with the growing rate of obesity associated with a characteristically unhealthy western diet. Type II diabetes is an extremely expensive disease to manage, and with the rapid growth of this pandemic our country will soon feel the economic burden of this disease. It is for this reason that cheaper medication needs to be investigated in the form of traditional plants, such as Sutherlandia frutescens. Prescription medication, such as tricyclic antidepressants, may also increase body weight or appetite thereby playing a role in obesity. The cause of weight gain in such cases may go unrecognized or lead to cessation of the medication with or without the practitioner’s knowledge or approval. It is therefore necessary to investigate the causative agents responsible for the excessive weight gain. Drinking water containing extracts of the S. frutescens, metformin (a well known type II diabetes medication) and amitriptyline (a common tricyclic antidepressant) was administered to three groups of ten male Wistar rats. The control group received water without any medication. The rat’s weight and food consumption was monitored throughout the trial and their oxygen consumption was also determined. Rats were sacrificed after four months of medicinal compliance and glucose uptake, in the presence and absence of insulin, was tested in epididymal fat, liver and muscle. Fasting plasma glucose levels, lipoprotein, cholesterol and triglyceride concentrations were also determined.
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  • Date Issued: 2003

Finite element simulations of shear aggregation as a mechanism to form platinum group elements (PGEs) in dyke-like ore bodies

  • Authors: Mbandezi, Mxolisi Louis
  • Date: 2002
  • Subjects: Platinum group , Magmas , Shear flow , Geophysics , Terrestrial heat flow
  • Language: English
  • Type: Thesis , Masters , MSc
  • Identifier: vital:5561 , http://hdl.handle.net/10962/d1018249
  • Description: This research describes a two-dimensional modelling effort of heat and mass transport in simplified intrusive models of sills and their feeder dykes. These simplified models resembled a complex intrusive system such as the Great Dyke of Zimbabwe. This study investigated the impact of variable geometry to transport processes in two ways. First the time evolution of heat and mass transport during cooling was investigated. Then emphasis was placed on the application of convective scavenging as a mechanism that leads to the formation of minerals of economic interest, in particular the Platinum Group Elements (PGEs). The Navier-Stokes equations employed generated regions of high shear within the magma where we expected enhanced collisions between the immiscible sulphide liquid particles and PGEs. These collisions scavenge PGEs from the primary melt, aggregate and concentrate it to form PGEs enrichment in zero shear zones. The PGEs scavenge; concentrate and 'glue' in zero shear zones in the early history of convection because of viscosity and dispersive pressure (Bagnold effect). The effect of increasing the geometry size enhances scavenging, creates bigger zero shear zones with dilute concentrate of PGEs but you get high shear near the roots of the dyke/sill where the concentration will not be dilute. The time evolution calculations show that increasing the size of the magma chamber results in stronger initial convection currents for large magma models than for small ones. However, convection takes, approximately the same time to cease for both models. The research concludes that the time evolution for convective heat transfer is dependent on the viscosity rather than on geometry size. However, conductive heat transfer to the e-folding temperature was almost six times as long for the large model (M4) than the small one (M2). Variable viscosity as a physical property was applied to models 2 and 4 only. Video animations that simulate the cooling process for these models are enclosed in a CD at the back of this thesis. These simulations provide information with regard to the emplacement history and distribution of PGEs ore bodies. This will assist the reserve estimation and the location of economic minerals.
  • Full Text:
  • Date Issued: 2002

Investigation of the bioconversion of constituents of olive effluents for the production of valuable chemical compounds

  • Authors: Notshe, Thandiwe Loretta
  • Date: 2002
  • Subjects: Phenols , Sewage -- Purification , Effluent quality
  • Language: English
  • Type: Thesis , Masters , MSc
  • Identifier: vital:4078 , http://hdl.handle.net/10962/d1007446 , Phenols , Sewage -- Purification , Effluent quality
  • Description: Olive mill wastewater is produced in large quantities during the production of olive oil and olive production effluents are produced during the processing of olives. This project was planned to find a use for constituents found in olive production wastewater. The task was carried out by first characterizing the olive effluents, then screening microorganisms for growth in the effluents and reduction of the pollutant properties of the effluents. An investigation into the biotransformation of aromatic compounds present in the effluents into useful chemicals, was carried out. The olive production effluents were collected from different stages in the process for treating olive wastewater, viz, a fermentation tank (FB), the surface of a digester (LV) and an evaporation pond (SO). The three effluents were characterized by investigating their phenolic composition. Protocatechuic acid, vanillic acid, syringic acid, hydroxyphenyl acetic acid, coumaric acid and ferulic acid were identified in an olive effluent, FB, using thin layer chromatography (TLC) and High perfomance liquid chromatography (HPLC). Hydroxyphenyl acetic acid constitutes almost 60% of the organics in olive effluent FB. Five bacteria, namely RU-LV1; RU-FBI and RU-FB2; RU-SOI and RU-S02, were isolated from the olive effluents LV, FB and SO respectively. These isolates were found to be halotolerant and were able to grow over a broad temperature and pH range, with the maximum temperature and pH for growth being 28°C and pH 7 respectively. A range of microorganisms were evaluated for their ability to grow and reduce the total phenolic content of the olive effluents. Among these Neurospora crassa showed the highest potential for the biological reduction of total phenolics in olive effluents. Approximately 70% of the total phenolic content was removed by N. crassa. Trametes verscilor, Pseudomonas putida strains, RU-KMI and RU-KM3s, and the bacteria isolated from olive effluents could also degrade the total phenolic content of olive effluents, but to a lesser extent. The ability of the five bacterial isolates to grow and degrade aromatic compounds was assessed by growing them in medium with standard aromatic compounds. RU-L V1 degraded 96%, 100%, 73% and 100% of caffeic acid, protocatechuic acid, p-coumaric acid and vanillic acid respectively. The other isolates degraded caffeic acid and protocatechuic acid, but their ability to degraded p-coumaric acid and vanillic acid was found to be lesser than the ability of RU-LV1 to degrade the same aromatic compounds. Whole cells of RU-LV1 degraded vanillic acid but no metabolic products were observed on HPLC analysis. Resting cells, French pressed extract, cell free extracts and cell debris from RU-LV1 cells induced with vanillic acid degraded vanillic acid, ferulic acid and vanillin at rates higher than those obtained from non-induced cultures. No products were observed during the degradation of vanillic acid. Ferulic acid was converted into vanillic acid by French pressed extract, cell free extract and cell debris of RU-LV1. The maximum yield of vanillic acid as a product (0 .23 mM, 50 %yield) was obtained when cell free extracts of RU-LVI, grown in glucose and induced by vanillic acid, were used for the degradation of 0.4 mM ferulic acid. Vanillin was rapidly converted into vanillic acid by resting cells, cell free extracts and French pressed extract of RU-LVI. Using molecular techniques, the similarity ranking of the RU-LVI 16S rRNA gene and its clone showed a high similarity to Corynebacterium glutamicum and Corynebacterium acedopltilum. The rapid degradation of vanillin to vanillic acid suggests that extracts from RU-LV1 degrade ferulic acid into vanillin which is immediately oxidized to vanillic acid. Vanillic acid is also considered as a high value chemical. This project has a potential of producing useful chemicals from cheap substrates that can be found in olive effluents. , KMBT_363
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  • Date Issued: 2002

The effects of night work and task diversification on efficiency of performance

  • Authors: Munton, Lynne Kerry
  • Date: 1998
  • Subjects: Night work -- Evaluation , Shift systems , Performance
  • Language: English
  • Type: text , Thesis , Masters , MA
  • Identifier: vital:5175 , http://hdl.handle.net/10962/d1018253
  • Description: This study investigated the effects of night work on performance efficiency. Night work is generally acknowledged to impair performance, yet much research has contradicted this assertion. The feasibility of including brief periods of physical activity to stimulate arousal within mentally demanding work shifts was also evaluated. Thirty six postgraduate volunteers were assigned to either the cognitive tasks (CT) or cognitive and motor tasks (CMT) group. All subjects performed three psycho-motor tests, using the Vienna Test System, at midday and midnight. The CMT group performed a short cycling activity before each test. Heart rate responses served as physiological measures, the Perceived Strain Scale was used to quantify individual perceptions of strain and performance efficiency was assessed in terms of speed and accuracy. Although several trends were apparent, no significant differences (p < 0.05) were revealed with respect to the three performance variables between the midday and midnight test sessions, or between the CT and CMT subjects, other than the higher heart rates recorded in the CMT group. In summary, neither time of day nor physical activity were found to affect performance within the controlled environment of this study.
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  • Date Issued: 1998

Architecture and landscape design : an investigation into the harmonising of these two aspects of design as exemplified by the collaboration of Gertrude Jekyll and Sir Edwin Landseer Lutyens

  • Authors: Judge, Stephen Michael
  • Date: 1996
  • Subjects: Lutyens, Edwin Landseer, Sir, 1869-1944 Jekyll, Gertrude, 1843-1932 Gardens -- Design Architecture, British
  • Language: English
  • Type: Thesis , Masters , MFA
  • Identifier: vital:2405 , http://hdl.handle.net/10962/d1002201
  • Description: Sir Edwin Lutyens and Miss Gertrude Jekyll were part of the 'Art's and Crafts' movement, which advocated the use of local techniques and materials. They grew up separately, both in the Surrey country-side and both among creative people. Jekyll later worked with Edward Hudson (the author of 'Country Life') who persuaded her to be a garden designer . Lutyens was inspired first by the architecture of Surrey (mostly that of Norman Shaw), then by his friend, Herbert Baker, at architectural school, and lastly, by his long - time partner Jekyll. Munstead Wood, Surrey, England, was the partners' first project and it embodies nearly all of their ideals; the natural and indigenous use of flowers and plants, with an ordered colour scheme ; graded colour schemes without discord; the use of entirely local materials ; the sole use of local craftsmen and local techniques; a garden of 'rooms'; the intergration of architecture and garden design. A revival of interest in the partners work has helped to recreate some of the lost gardens of Jekyll. This interest has in turn put a spotlight on the ideals employed by the partners. Their wide influence has also produced many great buildings and gardens, most notably through the work of Sir Herbert Baker in South Africa. The Union Buildings are a perfect example of Baker's work, and much of it has the stamp of Lutyens' style and ideals. Through my own interest in Lutyens and Jekyll I have created my own Jekyll-style border in Grahamstown, Eastern Cape, to try and prove that her ideals can be translated into climates other than that of England. In this experiment, I succeeded in using indigenous South African plants and flowers with a colour scheme in the style of Jekyll, proving that the ideals to which she aspired could be applied in other countries.
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  • Date Issued: 1996

A rhetorical analysis of 1 Timothy 2:9-15 with a special focus on the role of women in the church

  • Authors: Williams, Allan Alexander
  • Date: 1992
  • Subjects: Bible -- Criticism, interpretation, etc. , Women in the Bible , Women in Christianity -- History -- Early church, ca. 30-600 , Women in Christianity , Sexism in religion
  • Language: English
  • Type: Thesis , Masters , MTh
  • Identifier: vital:1299 , http://hdl.handle.net/10962/d1015721
  • Description: This thesis investigates the role of women in the early church as portrayed in 1 Timothy 2:9-15 using the recently-developed method of Rhetorical Analysis. It makes use of a rhetorical approach largely based on the method proposed by Kennedy, supplemented by insights from scholars who have emphasised the argumentative element in rhetoric. This method illustrates how the role of women in the church is decisively determined by the argument in the letter as a whole. A brief survey of classical rhetoric is given. The typical structure of a rhetorical discourse is listed with its component sections. The validity of using rhetorical analysis as a means for interpreting New Testament texts is justified. Textual units are identified from the structure of the text. Rhetorical insights are used to explain how the identified units cohere within the overall structure of the letter and how they relate to one another and interact. The thesis is developed that the section on women and teaching can only be meaningfully investigated in the light of the text as a whole and of the motifs in the letter. The thesis has a special focus on 2:9-15. This section is analysed in more detail than the rest of the text with the exception of 1 Timothy 1. As exordium, the latter provides the introduction to the situation dealt with in the letter, introduces the case, and sets the tone for the rest of the letter. The persuasive power of rhetoric in any situation depends to a large extent on its use of common tradition. The socio-cultural setting of the author is consequently analysed. Finally, the role of women in Graeco-Roman society is analysed in terms of motifs found in 1 Timothy 2:9-15.
  • Full Text:
  • Date Issued: 1992

An investigation into the use of weather type models in the teaching of South African climatology at senior secondary school level

  • Authors: Schürmann, Leon
  • Date: 1992
  • Subjects: Climatology -- Study and teaching (Secondary) , Geography -- Study and teaching (Secondary)
  • Language: English
  • Type: Thesis , Masters , MEd
  • Identifier: vital:2009 , http://hdl.handle.net/10962/d1015948
  • Description: The synoptic chart encodes climatological and meteorological information in a highly abstract manner. The pupil's level of cognitive development, the nature of the syllabus and the teaching strategies employed by the geography teacher influence the pupil's conceptualisation of information. The synoptic chart is a valuable tool for consolidating the content of the S.A climatology syllabus. Recent research has established that climatology-meteorology, and especially synoptic chart reading and interpretation, is difficult for the concrete thinker. These pupils find difficulty in visualising the weather processes and systems. Provided that they are simple and clear, models are useful teaching devices that integrate and generalise information in a manner that is easily retrievable. The intention of the author is to provide weather type models and other supporting strategies and aids as a means to improve the senior secondary pupil's assimilation of southern African climatological-meteorological information. This model-based approach is tested in the classroom using an action research framework to judge its efficacy. Conclusions are drawn and recommendations are made.
  • Full Text:
  • Date Issued: 1992

A comprehensive guide to conducting compensation surveys to determine competitive adjustments to base salary ranges

  • Authors: Snelgar, Robin John
  • Date: 1979
  • Subjects: Wage surveys , Wages
  • Language: English
  • Type: text , Thesis , Masters , MA
  • Identifier: vital:2896 , http://hdl.handle.net/10962/d1002060
  • Description: The compensation process is a complex network of sub-processes directed toward compensating people for services performed, and motivating them to obtain desired levels of performance. Among the intermediate components of this process are wage and salary payments, the awarding of other cost items such as insurance, vacations, sick leave, etc. (fringe benefits), and the provision of essentially non-cost rewards such as recognition, privileges and symbols of status. However, the broad subject of compensation in terms of cost to the organisation may be examined in two sections, namely, wage and salary administration, and fringe benefit administration. The compensation survey forms an integral part of both administration processes, and thus becomes a necessary and essential device in the determination of the final compensation package to the employee.
  • Full Text:
  • Date Issued: 1979
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