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Systematic marine spatial planning and monitoring in a data poor environment: a case study of Algoa Bay, South Africa

  • Authors: Chalmers, Russell
  • Date: 2012
  • Subjects: Spatial ecology -- South Africa -- Algoa Bay , Coastal zone management -- South Africa -- Algoa Bay
  • Language: English
  • Type: Thesis , Doctoral , PhD
  • Identifier: vital:5373 , http://hdl.handle.net/10962/d1015695
  • Description: Globally the failure of traditional fisheries management approaches is evident through the increasing number of overexploited or depleted marine stocks. Past sectoral management has failed to address cumulative impacts of fisheries activities on ecosystem health. Ecosystem based approaches have been advocated as a viable alternative for sustainable management of marine ecosystems as they present a holistic and precautionary approach, which integrates management of multiple activities with that of maintaining ecological health. Although conceptually advanced, implementation has been poor due to the complexities of competing ecological and socio-economic management objectives. Marine spatial planning can facilitate the implementation of ecosystem based management as it is able to address the spatial heterogeneity of biological communities and anthropogenic activities. Ecosystem based management approaches aim to address the full range of anthropogenic drivers on the marine environment, including but not limited to fisheries, tourism, coastal development, and land and marine based pollution sources amongst others. Fisheries activities have a direct impact on the local marine environment and were therefore the focus of this study which forms a starting point for implementing ecosystem based management in Algoa Bay. It is envisaged that future research will build on this foundation and include additional anthropogenic drivers into the management and monitoring strategies developed in this study in order to achieve a truly holistic ecosystem approach to management in Algoa Bay. Algoa Bay is situated centrally within the warm-temperate Agulhas bioregion along the east coast of South Africa and is the largest and best formed logarithmic spiral bay along this section of coastline. A large city, two commercial ports and several coastal settlements are located within Algoa Bay and a wide range of marine based activities occur within the area. A large section of the coastline is proclaimed as a National Park yet only two small offshore marine areas are formally protected. The development of a large marine protected area (MPA) adjoining the terrestrial section was proposed in the mid-1990s but a lack of adequate spatial data with which to quantify the fishery costs and conservation benefits led to wide scale public opposition and halted the declaration process. The primary goal of this study was to obtain and analyse baseline data to understand spatial and temporal trends in the distribution and abundance of fish populations and fisheries activities in order to develop a spatial framework for marine conservation and management in a data limited situation using Algoa Bay, South Africa as a case study. Furthermore, it aims to contribute to the development of a monitoring framework to evaluate the success of implementation and the resultant changes in biological and socio-economic environments. This information will be used to re-initiate the stakeholder engagement process in the future.
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  • Date Issued: 2012

An assessment of the motivational value of rewards among health professionals in Malawi's Ministry of Health

  • Authors: Chanza, Alfred Witness Dzanja
  • Date: 2012
  • Subjects: Employee motivation -- Malawi , Medical personnel -- Salaries, etc. -- Malawi , Medical personnel -- Job satisfaction -- Malawi , Public health -- Malawi
  • Language: English
  • Type: Thesis , Doctoral , DPhil
  • Identifier: vital:9963 , http://hdl.handle.net/10948/d1020330
  • Description: The assessment of the motivational value of rewards in the world of work is interesting but difficult to understand. Variations in research reports and inadequate comprehension of the efficiency and motivational value of rewards have brought about confusions, controversies and contradictions among authors, researchers, consultants and practitioners in the field of Industrial and Organisational Psychology (Mangham, 2007; Muula, 2006; Muula & Maseko, 2005; Palmer, 2006; World Bank, 2004). As a consequence, organisations are applying theories and models of motivation selectively depending on their beliefs, ideological framework of values and assumptions (Dzimbiri, 2009). The study was therefore carried out as a positive contribution to the existing knowledge and debate on the motivational value of rewards for health professionals in the public health sectors of the developing countries. Through a systematic sampling method, 571 health professionals were sampled for the study. Data were collected through the use of a self-administered questionnaire which was composed based on the data collected from desk research/literature review, focus group discussions and interviews. The findings of the study revealed that the Malawi‟s Ministry of Health (MoH) is failing to attract, motivate and retain health professionals; there is perception of inequity of the rewards among the health professionals; health professionals develop coping strategies to supplement their monthly financial rewards; health professionals engage in corrupt practices to supplement their monthly financial rewards; and there is erosion of industrial democracy in the Malawi‟s Public Health Sector. While the statistical testing of the hypothesized model proved a lack of fit between the variables, the statistical testing of the re-specified model suggests that there is a positive relationship between financial rewards and reward-related problems being faced by health professionals in the Malawi‟s MoH. Through the Structural Equation Modeling (SEM) exercise, an inverse (negative) relationship between financial and non-financial rewards was deduced, and scientifically and graphically demonstrated. Both the re-specified and graphical models symbolize a pragmatic departure from the theoretical model whose authors (Franco, Bennett, Kanfer & Stubblebine, 2004) are largely inclined to the use of non-financial rewards and suggest that financial rewards should be used with caution. These findings also reject the Herzberg‟s two factor theory (Herzberg, 1960) which claims that financial rewards (salaries) are not a motivator. The major recommendations of the study are that the Franco et al.‟s (2004) model should be adopted and adapted in the Malawi‟s MoH with the view that the value of both financial and non-financial rewards (as motivators) varies from individual to individual due to individual differences and prevailing factors/forces in both the work environment and wider society in which the MoH operates; a hybrid reward system combining the strengths of time-based, performance-based and competence-based reward systems should be developed and implemented; the results of scientifically testing the re-specified model and the inverse (causal) relationship established between financial and non-financial rewards (as demonstrated in a graphic model) should be re-tested with other samples in the public health sectors of the developing countries; and the motivational value of non-financial rewards should be scientifically established and compared with the motivational value of financial rewards used independent of each other in business organisations to make an objective conclusion on the rewards-motivation debate.
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  • Date Issued: 2012

Understanding the biomolecular interactions involved in dimerisation of the Saccharomyces cerevisiae eukaryotic translation initiation factor 5A

  • Authors: Charlton, Jane Laura
  • Date: 2012
  • Subjects: Proteins -- Synthesis -- Research , Saccharomyces cerevisiae -- Research , Dimers , Dimers -- Research , Eukaryotic cells -- Research , Yeast -- Research
  • Language: English
  • Type: Thesis , Masters , MSc
  • Identifier: vital:4057 , http://hdl.handle.net/10962/d1004118 , Proteins -- Synthesis -- Research , Saccharomyces cerevisiae -- Research , Dimers , Dimers -- Research , Eukaryotic cells -- Research , Yeast -- Research
  • Description: Translation initiation factor 5A (IF5A) is an essential, highly conserved protein found within all eukaryotic (eIF5A) and archaeal (aIF5A) cells. The IF5A protein is unique in that it contains the amino acid hypusine; a two-step post translational modification of a single, conserved lysine residue. Although hypusination of eIF5A is vital for eukaryotic cell viability, the primary role of the protein and its hypusine side chain remain a mystery. eIF5A, initially identified as a translation initiation factor, is not required for global protein synthesis leading to the prevailing proposal that eIF5A is purely involved in the translation of a select subset of mRNAs. Recently a number of mutational studies have focused on the conserved, hypusine-containing loop region of eIF5A where specific residues have been found to be essential for activity without affecting hypusination. It has been postulated that eIF5A exists as a dimer (40 kDa) under native conditions and that these residues may be at the interface of dimerisation. The aim of this research was therefore to conduct a mutational analysis of the loop region in support of this hypothesis. A functional analysis of the Saccharomyces cerevisiae eIF5A mutant proteins K48D, G50A, H52A and K56A revealed that these substitutions impaired growth to varying degrees in vivo with G50A and K48D mutant proteins displaying the most convincing defects. Gel filtration profiles gave unexpected results determining eIF5A mutant and wild type proteins to have a native molecular weight of 30 to 31 kDa, suggesting that the eIF5A oligomeric state may be transitory and subject to certain conditions. The inconclusive results obtained from using gel filtration studies led to an investigation into the feasibility of producing native, hypusinated peptides for future structural studies using nuclear magnetic resonance. Hypusinated and unhypusinated eIF5A were successfully separated into their domains making this a possibility. Finally, this study proposes a role for eIF5A in eukaryotic IRES-driven translation initiation.
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  • Date Issued: 2012

Electrochemistry and photophysicochemical studies of titanium, tantalum and vanadium phthalocyanines in the presence of nanomaterials

  • Authors: Chauke, Vongani Portia
  • Date: 2012
  • Subjects: Phthalocyanines -- Synthesis Electrochemistry Titanium Tantalum Vanadium
  • Language: English
  • Type: Thesis , Doctoral , PhD
  • Identifier: vital:4313 , http://hdl.handle.net/10962/d1004971
  • Description: The syntheses of tetra- and octa-substituted phthalocyanine complexes of titanium (IV) oxide vanadium (IV) oxide and tantalum (V) hydroxide and their electrochemical characterisation are presented in this work. The structures and purity of these complexes were confirmed by NMR, infrared and mass spectroscopies and elemental analysis. They show good solubility in most common solvents especially non-viscous solvents such as dichloromethane and chloroform. The cyclic voltammograms (CV) showed reversible to quasi reversible behavior for all the reduction couples and the oxidation peaks were irreversible. Spectroelectrochemistry of the complexes confirmed metal and ring redox processes for TaPc and TiPc derivatives and ring based processes only for VPc complexes. The synthesis of gold nanoparticles and their conjugation with the new phthalocyanines was carried out. Similarly, single walled carbon nanotubes were conjugated to selected tantalum complexes and the characterization of all the nanomaterials and their conjugates using different techniques that include TEM, XRD and AFM is also presented in this work. The photophysical and photochemical properties and photocatalytic oxidation of cyclohexene properties of the newly synthesised in the presence of gold nanoparticles were investigated. The compounds were stable, well within the stability range for phthalocyanines. The singlet oxygen quantum yield values increased drastically in the presence of gold nanoparticles. The photocatalytic products obtained from the reaction were cyclohexene oxide, 2-cyclohexen-1-ol, 2-cyclohexene-1-one and 1,4-cyclohexanediol. The percentage conversion values, yields and selectivity values improved significantly in the presence of AuNPs. Singlet oxygen was determined to be the main agent involved in the photocatalytic oxidation of cyclohexene. The electrocatalytic oxidation of bisphenol A and p-nitrophenol was carried out using nickel tetraamino phthalocyanine and all the newly synthesised metallophthalocyanine in the presence of gold nanoparticles and single walled carbon nanotubes. The charge transfer behaviour of AuNPs was enhanced in the presence of TaPc, TiPc and VPc complexes. The presence of single walled carbon nanotubes further improved electron transfer and minimised electrode passivation.
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  • Date Issued: 2012

Adapting to climate change to achieve household food security: a case study of small-scale farmers at Dzindi smallholder irrigation scheme in the Limpopo Province of South Africa

  • Authors: Chigavazira, Blessing Munyaradzi
  • Date: 2012
  • Subjects: Climatic changes -- South Africa -- Limpopo , Food security -- South Africa -- Limpopo , Farms, Small -- South Africa -- Limpopo , Sustainable agriculture -- South Africa -- Limpopo , Irrigation farming -- South Africa -- Eastern Cape , Irrigation projects -- South Africa -- Limpopo
  • Language: English
  • Type: Thesis , Masters , M Soc Sc (Dev)
  • Identifier: vital:11434 , http://hdl.handle.net/10353/d1007186 , Climatic changes -- South Africa -- Limpopo , Food security -- South Africa -- Limpopo , Farms, Small -- South Africa -- Limpopo , Sustainable agriculture -- South Africa -- Limpopo , Irrigation farming -- South Africa -- Eastern Cape , Irrigation projects -- South Africa -- Limpopo
  • Description: This dissertation explored adaptation mechanisms and adaptation options employed by rural small-scale farmers at Dzindi Irrigation Scheme to achieve food security in the midst of climate change as well as reflecting on the role of the state in building capacity of rural small-scale farmers to adapt to climate change. The study employed qualitative research techniques and data was obtained through semi-structured interviews with 40 small-scale farmers at Dzindi smallholder irrigation scheme.Irrigation control, high yielding crop varieties (HYVs), drought resistant crop varieties, drip irrigation are among a host of adaptation strategies successfully employed by farmers at Dzindi. These strategies have been effective in giving the farmers a lifeline in terms of household food supply and income.However, lack of funding, modern infrastructure and equipment has hampered adaptation efforts at the scheme. This has been compounded by lack of support from the Government. Government seemingly has not done enough to capacitate and assist famers to adapt to climate change.
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  • Date Issued: 2012

Electrospun nanofibers : an alternative sorbent material for solid phase extraction

  • Authors: Chigome, Samuel , Samuel Chigome
  • Date: 2012 , 2012-03-26
  • Subjects: Nanofibers -- Research Electrospinning -- Research Sorbents -- Research Extraction (Chemistry) -- Research
  • Language: English
  • Type: Thesis , Doctoral , PhD
  • Identifier: vital:4314 , http://hdl.handle.net/10962/d1004972
  • Description: The work described in the thesis seeks to lay a foundation for a better understanding of the use of electrospun nanofibers as a sorbent material. Three miniaturised electrospun nanofiber based solid phase extraction devices were fabricated. For the first two, 10 mg of electrospun polystyrene fibers were used as a sorbent bed for a micro column SPE device (8 mm bed height in a 200 μl pipette tip) and a disk (I) SPE device (5 mm 1 mm sorbent bed in a 1000 μl SPE barrel). While for the third, 4.6 mg of electrospun nylon nanofibers were used as a sorbent bed for a disk (II) SPE device, (sorbent bed consisting of 5 5 mm 350 μm stacked disks in a 500 μl SPE barrel). Corticosteroids were employed as model analytes for performance evaluation of the fabricated SPE devices. Quantitative recoveries (45.5-124.29 percent) were achieved for all SPE devices at a loading volume of 100 μl and analyte concentration of 500 ng ml-1. Three mathematical models; the Boltzmann, Weibull five parameter and the Sigmoid three parameter were employed to describe the break through profiles of each of the sorbent beds. The micro column SPE device exhibited a breakthrough volume of 1400 μl, and theoretical plates (7.98-9.1) while disk (I) SPE device exhibited 400-500 μl and 1.39-2.82 respectively. Disk (II) SPE device exhibited a breakthrough volume of 200 μl and theoretical plates 0.38-1.15. It was proposed that the formats of future electrospun nanofiber sorbent based SPE devices will be guided by mechanical strength of the polymer. The study classified electrospun polymer fibers into two as polystyrene type (relatively low mechanical strength) and nylon type (relatively high mechanical strength).
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  • Date Issued: 2012

The mediating role of mobile technology in the linkage between customer satisfaction and customer loyalty

  • Authors: Chihombori, Rumbidzai Anna
  • Date: 2012
  • Subjects: Mobile commerce , Mobile communication systems , Customer services -- Management , Customer relations , Customer loyalty , Customer services -- Evaluation
  • Language: English
  • Type: Thesis , Masters , M Com (Business Management)
  • Identifier: vital:11324 , http://hdl.handle.net/10353/d1013388 , Mobile commerce , Mobile communication systems , Customer services -- Management , Customer relations , Customer loyalty , Customer services -- Evaluation
  • Description: The main objective of this study was to critically investigate the mediating role that the use of mobile technology plays in the linkage between customer satisfaction and customer loyalty in a semi-urban environment. The research problem focused on the application of mobile technology in the linkage between customer satisfaction and customer loyalty in the clothing industry in King Williams Town. In accomplishing this objective, this research study hypothesised that mobile technology plays a mediating role in the linkage between customer satisfaction and customer loyalty of customers of clothing retailers in South Africa. Multiple regression was conducted to test for the first hypothesis. The first secondary objective aimed at establishing if there is disconfirmation between customer expectations and the performance of clothing retail outlets in King Williams Town. In exploring this objective, it was hypothesised that there is negative disconfirmation between customer expectations and performance. A paired sample test was conducted to test for this hypothesis. In addition, the influence of service quality and customer satisfaction on customer loyalty was explored. To accomplish these, it was hypothesised that both service quality and customer satisfaction have an influence on customer loyalty. Pearson’s Correlation and the Chi-Square Test were applied to test the influence of service quality and Customer satisfaction on Customer loyalty. Data was analysed using the Statistical Package for Social Sciences (SPSS) statistical software. Regression analysis, chi-square tests, Paired sample tests and correlation reports were used to analyse data inferentially. Reliability and validity of the research was also tested using Cronchbach’s alpha test. The results show that mobile phones have become a basic necessity for customers and that mobile technology plays a mediating role in the linkage between customer satisfaction and customer loyalty; however, the mediation is partial. The results also show that there is positive disconfirmation between customer expectations and retailer performance; that both service quality and customer satisfaction have a positive correlation with customer loyalty and that mobile technology enhances customer loyalty. Finally, the results show that the total service experience of customers is favourable vii because the five components of service quality were rendered at a high level of service quality. The study offers several managerial recommendations. Firstly, retail managers should make strategic investments in mobile technology and use this technology to the full to reap the benefits of technologically advanced mobile communication. Secondly, managers should be creative in their use of this mobile technology to enhance customer satisfaction and, hence, customer loyalty. Thirdly, managers should prioritise the improvement of all five components of service quality in order to enhance customer loyalty. Finally, managers should provide a customer-centred service experience that exceeds customer expectations for service quality and mobile communication, one that maximises customer satisfaction and loyalty. The implementation of these recommendations could result in clothing retailers providing a customer-focused service experience in all five aspects of service quality. To successfully implement these recommendations, clothing retailers should: ensure that expectations created, could be accomplished or exceeded to build and enhance customer satisfaction; create expectations that are realistic to avoid negative disconfirmation and hence customer dissatisfaction; implement innovative and creative mobile communication strategies to build and enhance customer loyalty; and finally, improve loyalty programmes to enlarge the customer base.
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  • Date Issued: 2012

Liquidity risk management by Zimbabwean commercial banks

  • Authors: Chikoko, Laurine
  • Date: 2012
  • Subjects: Liquidity (Economics) , Banks and banking -- Zimbabwe
  • Language: English
  • Type: Thesis , Doctoral , PhD
  • Identifier: vital:9027 , http://hdl.handle.net/10948/d1020344
  • Description: Macroeconomic and financial market developments in Zimbabwe since 2000 have led to an increase in many banks‟ overall exposure to liquidity risk. The thesis highlights the importance of understanding and building comprehensive liquidity frameworks as defenses against liquidity stress. This study explores liquidity and liquidity risk management practices as well as the linkages and factors that affected different types of liquidity in the Zimbabwean banking sector during the Zimbabwean dollar and multiple currency eras. The research sought to present a comprehensive analysis of Zimbabwean commercial banks‟ liquidity risk management in challenging operating environments. Two periods were selected: January 2000 to December 2008 (the Zimbabwean dollar era) and March 2009 to June 2011 (the multiple currency era). Explanatory and survey research designs were used. The study applied econometric modeling using panel regression analysis to identify the major determinants of liquidity risk for 15 commercial banks in Zimbabwe. The financing gap ratio was used as the proxy for liquidity risk. The first investigation was on liquidity risk determinants in the Zimbabwean dollar era. The econometric investigations revealed that an increase in capital adequacy reduced liquidity risk and that there was a positive relationship between size and bank illiquidity. Liquidity risk was also explained by spreads. Inflation was positively related to liquidity risk and was a significant explanatory variable. Non-performing loans were not significant in explaining commercial banks‟ illiquidity, which is contrary to expectations. The second investigation was on commercial banks‟ liquidity risk determinants in the multiple currency era by using panel monthly data. The results showed that capital adequacy had a significant negative relationship with liquidity risk. The size of the bank was significant and positively related to bank illiquidity. Unlike in the Zimbabwean dollar era, spreads were negatively related to bank liquidity risk. Again, non-performing loans were a significant explanatory variable. The reserve requirements ratio and inflation also influenced bank illiquidity in the multiple currency regime. In both investigations, robustness tests for the main findings were done with an alternative dependent variable to the financing gap ratio. To complement the econometric analysis, a survey was conducted using questionnaires and interviews for the same 15 commercial banks. Empirical analysis in this research showed that during the 2000-2008 era; (i) no liquidity risk management guidelines were issued by the Reserve Bank of Zimbabwe until 2007. Banks relied on internal efforts in managing liquidity risk (ii) Liquidity was managed daily by treasury (iii) The operating environment was challenging with high inflation rates, which led to high demand for cash withdrawals by depositors (iv) Locally owned banks were more exposed to liquidity risk as compared to the foreign owned banks (v) Major sources of funds were new deposits, retention of maturities, shareholders, interbank borrowings, offshore lines of credit and also banks relied on the Reserve Bank of Zimbabwe as the lender of last resort (vi) Financial markets were active and banks offered a wide range of products (vii) To manage liquidity from depositors, banks relied on cash reserves, calculating and analysing the withdrawal patterns. When faced with cash shortages, banks relied on the daily limits set by the Reserve Bank of Zimbabwe (viii) Banks were lending but when the challenges deepened, they lent less in advances and increased investment in government securities. (ix) Inflation had major effects on liquidity risk management as it affected demand deposit tenors, fixed term products, corporate sector deposit mobilisation, cost of funds and investment portfolios (x) The regulatory environment was not favourable with RBZ policy measures designed to arrest inflation having negative repercussions on banks` liquidity management (xi) Banks had no liquidity crisis management frameworks. During the multiple currency exchange rate system (i) Commercial banks had problems in sourcing funds. They were mainly funded by transitory deposits with little coming in from treasury activities, interbank activities and offshore lines of credit. There was no lender of last resort function by the Reserve Bank of Zimbabwe. (ii) Some banks were still struggling to raise the minimum capital requirements (iii) Commercial banks offered narrow product ranges to clients (iv) To manage liquidity demand from clients, banks relied on the cash reserve ratio, and calculated the patterns of withdrawal, while some banks communicated with corporate clients on withdrawal schedules. (v) Zimbabwe commercial banks resumed the lending activity after dollarisation. Locally owned banks were aggressive, while foreign owned banks took a passive stance. There were problems with non-performing loans, especially from corporate clients, which exposed many banks to liquidity risk. (vi) Liquidity risk management in Zimbabwe was still guided by the Reserve Bank of Zimbabwe Risk Management Guideline BSD-04, 2007. All banks had liquidity risk management policies and procedure manuals but some banks were not adhering to them. Banks also had liquidity risk limits in place but some violated them. Furthermore, some banks were not conducting stress tests. Although all banks had contingency plans in place, none were testing them. Specifically, the research study highlighted the potential sources of liquidity risk in the Zimbabwean dollar and multiple currency periods. Based on the results, the study recommends survival strategies for banks in managing liquidity risk in such environments. It proposes a comprehensive liquidity management framework that clearly identifies, measures and control liquidity risk consistent with bank-specific and the country‟s macroeconomic developments. The envisaged framework would assist banks in dealing with illiquidity in a manner that would be less disruptive and that could render any future crisis less painful. Of importance is the recommendation that the central bank might not need to be too strict or too relaxed, but be moderate in ensuring an enabling regulatory environment. This would help banks to manage liquidity risk and at the same time protect depositors in any challenging operating environment. In both the studied time periods, there were transitory deposits. Generally there is need to inculcate a savings culture in Zimbabwe.
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  • Date Issued: 2012

Implementation of the Zimbabwe National Orphan Care Policy: implications of partnership between government and civil society

  • Authors: Chimange, Mizeck
  • Date: 2012
  • Subjects: Political participation -- Zimbabwe , Civil service -- Zimbabwe , Political leadership -- Zimbabwe , Public administration -- Zimbabwe -- Citizen participation , Orphanages -- Zimbabwe , Orphans -- Zimbabwe , Zimbabwe -- Politics and government , Zimbabwe -- Social conditions
  • Language: English
  • Type: Thesis , Masters , M Soc Sc (Dev)
  • Identifier: vital:11435 , http://hdl.handle.net/10353/d1007188 , Political participation -- Zimbabwe , Civil service -- Zimbabwe , Political leadership -- Zimbabwe , Public administration -- Zimbabwe -- Citizen participation , Orphanages -- Zimbabwe , Orphans -- Zimbabwe , Zimbabwe -- Politics and government , Zimbabwe -- Social conditions
  • Description: The study focused on the exploration of the implication of partnership between the government and civil society organizations in the implementation of the Zimbabwe National Orphan Care Policy (ZNOCP). The study was carried out in Masvingo District in Zimbabwe to explore on the feasibility of inter-organizational interaction in policy implementation and how it affects the service delivery system. The study incorporated government departments, civil society organizations and ward councillors who stood as the custodians of the people. The study was intended on unveiling the different contextual aspects that exist between government departments and civil-society organizations (CSOs) as individual and separate entities and how the compromising of their values would affect the partnership. Looking at the hierarchical and bureaucratic features of government institutions, the study also intended to understand how this could be concealed and compromised with CSOs‟ open agendas in public policy implementation to ensure effective service delivery to the people. The 5C protocol, critical variables in policy implementation which are policy content, context, capacity, commitment of those entrusted with the implementation process and also clients and coalitions were used as the yardsticks. These variables acted as a yardstick on which to analyze the partnership between the Zimbabwean government and the civil society in the implementation of the Z.N.O.C.P, their different attitudes, bureaucratic settings, organizational culture, values, norms, and how their readjustments or failure affect the service delivery system. It also became imperative to look at the government legislations that govern the CSO space of operation and financial aspects to understand the implications of partnership between government and civil society. An understanding of these aspects leads to an increased understanding of the feasibility of state-CSO partnerships and its implications on policy implementation.
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  • Date Issued: 2012

The impact of entrepreneurship education on the performance of small, micro and medium enterprises in the Buffalo City Metropolitan Municipality

  • Authors: Chimucheka, Tendai
  • Date: 2012
  • Subjects: Small business -- South Africa -- Eastern Cape , Performance -- Management , Organizational commitment -- South Africa -- Eastern Cape , Labor turnover -- South Africa -- Eastern Cape , Employee empowerment -- South Africa -- Eastern Cape , Entrepreneurship -- South Africa -- Eastern Cape
  • Language: English
  • Type: Thesis , Masters , M Com (Business Management)
  • Identifier: vital:11321 , http://hdl.handle.net/10353/d1007107 , Small business -- South Africa -- Eastern Cape , Performance -- Management , Organizational commitment -- South Africa -- Eastern Cape , Labor turnover -- South Africa -- Eastern Cape , Employee empowerment -- South Africa -- Eastern Cape , Entrepreneurship -- South Africa -- Eastern Cape
  • Description: Small Micro and Medium Enterprises (SMMEs) play an important role in contributing to economic development of many countries around the world, including South Africa. Despite the importance of SMMEs an unacceptable and disappointingly high number of these ventures fail during the first few years of operation. It is in light of the importance and challenges faced by SMMEs that the performance of SMMEs is of interest to all countries. This study investigated the impact of entrepreneurship education on the performance of SMMEs in the Buffalo City Metropolitan Municipality. The objectives of the study were to investigate the role of entrepreneurship education in improving entrepreneurship skills and knowledge of owner/managers of SMMEs in the Buffalo City Metropolitan Municipality, to determine the role of entrepreneurship education on the establishment and survival of SMMEs and to identify strategies that can be implemented to improve the performance of SMMEs. Both primary and secondary data sources were used in this study. A quantitative research design was used in conducting this research. Simple random sampling, a probability sampling technique was used to select a sample of 201 from the sample frame of 420 registered SMMEs. The survey method, by way of a self-administered questionnaire was used to collect primary data. The statistical Package for Social Sciences (SPSS) is the statistical software that was used to analyse data. The Chi-square test, the T-test, Pearson Product Moment Correlation and descriptive statistics were used to analyse data. Validity and reliability of the research instrument and the findings was assured. The results for this study are useful for the development of the SMME sector, which is very important to South Africa for they contribute to the solving of socio-economic challenges. The findings of this research showed that entrepreneurship education has a positive impact on the performance of SMMEs and it plays a critical role in improving entrepreneurial skills and knowledge of SMME owners and managers. It was also found that entrepreneurial education is very important for the establishment and survival of SMMEs. Strategies that can be implemented to improve the performance of SMMEs in South Africa were suggested to the government, government agencies, educational institutions, other organisations, and SMME owners and managers.
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  • Date Issued: 2012

Assessment of the role of traditional leadership in facilitating community development in rural Malaw

  • Authors: Chinkonda, Sosten Sylvester Joseph
  • Date: 2012
  • Subjects: Rural development -- Malawi , Community development -- Malawi , Tribal government -- Malawi , Land use, Rural -- Malawi , Traditional leaders , Development project , Power , Participation , Social capital , Neo-liberalism , Debt crisis , Structural Adjustment Programme , Rational choice
  • Language: English
  • Type: Thesis , Masters , M Soc Sc (Rural Development)
  • Identifier: vital:11943 , http://hdl.handle.net/10353/d1004907 , Rural development -- Malawi , Community development -- Malawi , Tribal government -- Malawi , Land use, Rural -- Malawi , Traditional leaders , Development project , Power , Participation , Social capital , Neo-liberalism , Debt crisis , Structural Adjustment Programme , Rational choice
  • Description: The study was carried out to assess the extent to which the intervention of traditional leaders is effective in mobilising support for community development projects and to examine the perceptions that communities have about the role of the traditional leaders in development projects. The study has been guided by the critique of neoliberalism which exposes the negative effects of implementing the Structural Adjustment Programmes (SAPs) in Third World countries. The literature that has been reviewed has looked at the historical and political background of the role of chiefs and other traditional leaders in order to assess the nature of participation that is promoted through their involvement in development projects. An overview of the neo-liberal prescription and its critique has been made in order to expose the effects of the oil embargo of 1973 and the debt crisis of the 1980s on the economies of Third World countries in general and Malawi in particular. On the basis of evidence which has been gathered through a survey and focus group discussion, the study has found that the intervention of traditional leaders is very effective in mobilising communities for development projects. It has further been established that communities have high regard for their traditional leaders and that they perceive them as crucial role players in the conception and implementation of development projects. The study has however established that traditional leaders use unorthodox means such as threats of punishment to solicit the cooperation of the community members which in essence is counterproductive to the participatory approach to development.
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  • Date Issued: 2012

Living with HIV/AIDS in King Williams Town, Eastern Cape

  • Authors: Chinyama, Ephraim
  • Date: 2012
  • Subjects: AIDS (Disease) -- South Africa -- Eastern Cape , HIV-positive persons -- South Africa -- Eastern Cape , HIV-positive persons -- Social aspects -- South Africa -- Eastern Cape , King William's Town (South Africa)
  • Language: English
  • Type: Thesis , Masters , M Soc Sc (Rural Development)
  • Identifier: vital:11956 , http://hdl.handle.net/10353/d1005964 , AIDS (Disease) -- South Africa -- Eastern Cape , HIV-positive persons -- South Africa -- Eastern Cape , HIV-positive persons -- Social aspects -- South Africa -- Eastern Cape , King William's Town (South Africa)
  • Description: This study examines the lifestyle decisions of people who are diagnosed with HIV/AIDS in King Williams Town, Eastern Cape. The study was motivated by the ever growing number of people who are now living with HIV/AIDS. Therefore the researcher intended to examine their decisions regarding sexual choices, reproductive health, diet, physical fitness and their coping strategies. The study found that there is very low uptake of Voluntary Counseling and Testing (VCT). Most people only get tested if they are compelled by other factors, like illness and pregnancy. It also found that HIV positive people continue to engage in risky sexual behaviour regardless of their positive status. In addition it also found that HIV positive status does not affect sexual activity and social support from family and friends is a very important factor that is helping the respondents to cope with HIV diagnosis.
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  • Date Issued: 2012

An investigation of the role of physical manipulatives in the teaching and learning of measurement in Grade 8 : a case study using surface area and volume

  • Authors: Chiphambo, Shakespear M E K
  • Date: 2012
  • Subjects: Measurement -- Study and teaching -- Research Mathematics -- Education (Secondary) -- Study and teaching Teaching -- Aids and devices -- Research
  • Language: English
  • Type: Thesis , Masters , MEd
  • Identifier: vital:1657 , http://hdl.handle.net/10962/d1003540
  • Description: The purpose of this study is to investigate the role of physical manipulatives in the teaching and learning of measurement in Grade 8. The study focuses on how the use of physical manipulatives promotes learners' mathematical proficiency in relation to the five strands of Kilpatrick, Swafford and Findell (2001). The basis of the research is a case study in the interpretive paradigm involving 18 out of a cohort of 270 Grade 8 learners in the school where I teach. The data was collected using a range of methods including: (i) baseline assessment tasks, first piloted using 7 Grade 8 learners and then given to the target group; (ii) an intervention programme with intervention tasks; (iii) a post-intervention task; (iv) observations during the intervention; and (v) individual interviews. The results of the baseline assessment and the post-intervention tasks were analysed both quantitatively and qualitatively. My research findings indicate an overall improvement of the performance after learners engaged in using physical manipulatives. The average mark of the learners in the baseline assessment task was 23% and after the intervention programme the average mark was 31 %. The responses from the learners interviewed showed that they were motivated and that the use of physical manipulatives assisted them in understanding the concepts of measurement, in particular surface area and volume. The results of my study thus reveal that the use of physical manipulatives in teaching and learning mathematics has a positive role to play in learners' understanding of surface area and volume at the Grade 8 level. The fmdings of this case study support other research regarding the importance of using physical manipulatives in teaching and learning mathematics. They align with other findings that assert that manipulatives are essential mediating tools in the development of the conceptual and procedural understanding of mathematical concepts, clarifying and helping learners to visualize abstract mathematical concepts.
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  • Date Issued: 2012

A comparative analysis of the enforcement of market abuse provisions

  • Authors: Chitimira, Howard
  • Date: 2012
  • Subjects: Corporation law -- South Africa , Insider trading in securities -- South Africa , Securities -- South Africa , Efficient market theory , Securities fraud
  • Language: English
  • Type: Thesis , Doctoral , LLD
  • Identifier: vital:10240 , http://hdl.handle.net/10948/d1015008
  • Description: Market abuse practices may directly or indirectly give rise to diverse problems such as inaccurate stock market prices, low public investor confidence, reduced market integrity and poor efficiency in the affected financial markets. This thesis reveals that three major forms of market abuse, namely insider trading, prohibited trading practices (trade-based market manipulation) and the making or publication of false, misleading or deceptive statements, promises and forecasts relating to listed securities (disclosure-based market manipulation) are prohibited in South Africa. However, although South Africa has had market abuse legislation for about 30 years, and must be commended for its great effort to enhance market integrity by combating market abuse practices, the enforcement of such legislation is still problematic. Moreover, in spite of the fact that there is no empirical data or accurate figures quantifying the occurrence and extent of market abuse activities in the South African financial markets, this thesis submits that market abuse practices are still to be completely eradicated. Accordingly, this thesis suggests that the aforementioned problem might have been aggravated by inter alia, various gaps, flaws and/or inconsistent implementation and enforcement of the market abuse legislation in South Africa. To this end, the anti-market abuse enforcement framework under the Securities Services Act 36 of 2004 is analysed to investigate its adequacy. The co-operation and role of the Financial Services Board, the courts, the Directorate of Market Abuse and other relevant stakeholders is also examined and discussed. Moreover, the co-operation between the Financial Services Board and similar international agencies is discussed to gauge its effectiveness in relation to the combating of cross-border market abuse practices. The adequacy of the awareness and preventative measures in place to curb market abuse practices is also investigated to determine whether such measures are robust enough to combat other new challenges that were posed by the 2007 to 2009 global financial crisis. Furthermore, a comparative analysis is undertaken of the enforcement of the market abuse prohibition in other jurisdictions, namely the United States of America, the United Kingdom, the European Union and Australia. This was done to investigate the relevant lessons that can be learnt or adopted from these jurisdictions. The thesis further discusses the adequacy of the recently introduced provisions of the Financial Markets Bill as well as the subsequent market abuse provisions of the Financial Markets Bill 2012. The thesis highlights that the aforementioned Bills are positive attempts by the policy makers to improve the enforcement of the market abuse provisions in South Africa. Nonetheless, the thesis reveals that most of the shortcomings contained in the Securities Services Act 36 of 2004 were duplicated in the Financial Markets Bill and the Financial Markets Bill 2012. In light of this, it remains to be seen whether the market abuse provisions contained in the Financial Markets Bill and/or the Financial Markets Bill 2012 will improve the combating of market abuse practices in South Africa. Consequently, it is hoped that the relevant market abuse provisions of the Securities Services Act 36 of 2004, the Financial Markets Bill and/or the Financial Markets Bill 2012 will be comprehensively reviewed in regard to the recommendations made in this thesis. To this end, the thesis proposes a viable anti-market abuse model and policy framework and sets out both policy objectives and provisions which policy makers could use to strengthen some of the market abuse provisions in South Africa.
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  • Date Issued: 2012

The synthesis and breast cancer inhibitory activity of cinnamic acid analogues based on the halogenated monoterpene pharmacophore

  • Authors: Chiwakata, Maynard Tendai
  • Date: 2012
  • Subjects: Halocarbons , Cancer -- Treatment , Breast -- Cancer -- Treatment
  • Language: English
  • Type: Thesis , Masters , MSc
  • Identifier: vital:3866 , http://hdl.handle.net/10962/d1016129
  • Description: Breast cancer is one of the leading causes of death, with mortality rate estimates of 465 000 deaths per annum. It is estimated that 1.3 million women are diagnosed with the disease each year especially in the developing countries. Current chemotherapy relies on the use of high doses of non-specific toxic agents that possess adverse side effects and compromise patient’s compliance and adherence to treatment. Paclitaxel, one of the common drugs used in breast cancer chemotherapy results in sensory and motor neuropathy, whilst hormonal therapy e.g. Herceptin causes severe cardiovascular, gastrointestinal and cutaneous side effects. There has been a demand in developing newer cancer agents that demonstrate selective cytoxicity with minimal effect on normal body tissue. Numerous studies have shown that marine organisms produce a wide range of halogenated compounds that possess cytotoxic properties, and hence can be a source of new drug hits or leads for cancer therapy. Halomon, a polyhalogenated monoterpene from Portieria hornemannii, displayed interesting activity against brain, renal and lung cancer tumours with selective/differential cytotoxicity. This inspired us to focus our project on halogenated monoterpenes isolated from the same Rhodophyta class as P. hornemannii but with particular attention to Plocamium species. Several metabolites have been isolated from P. cornutum, P. corallorhiza and P. suhrii that possess interesting cytotoxicities against a breast cancer cell line (MCF7) and an oesophageal cancer line (WHCO1). The aim of the project was therefore centred at isolating target compounds for preliminary structure-activity studies against a breast cancer cell line, and use this information to synthesize a series of analogues that are more stable than the natural products and yet as active using a fragment-based type approach to map out pharmacophoric elements. Five metabolites were isolated from P. cornutum and five from P. corallorhiza. Cell-based assays were conducted using an MTT assay kit against MCF7 and MDA-MB-231 breast cancer cell lines and (1E,3E,5S,6R)-1,5,6-trichloro-2-(dichloromethyl)-6-methylocta-1,3,7-triene, isolated from P. cornutum was the most active with IC50 values of 3.0 μM and 6.15 μM respectively. Introduction of a terminal aromatic ring to enhance stability, together with varying substituents (H, CH3, CF3, Br, CN, CHO, CHCl2) on position 7 of the molecule, gave rise to a series of cinnamate ester derivatives inspired by (1E,3E,5S,6R)-1,5,6-trichloro-2-(dichloromethyl)-6-methylocta-1,3,7-triene. The analogues were synthesized from their benzaldehyde precursors via Aldol condensation, esterification and Wittig reactions. Their carboxylic acid counterparts were synthesized by hydrolysis of the parent esters in an attempt to promote water solubilities of the analogues. Biological activity assays were then conducted with the cinnamate analogues against the MDA-MB-231 breast cancer cell line using an MTT assay kit. Ester derivatives with -CHO and -CHCl2 functionalities had IC50 values of 43.45 μM and 100.01 μM respectively whilst the other ester derivatives were inactive. It was concluded that either an aldehyde (-CHO) or gem-dichlorides (-CHCl2) is specifically required for cytotoxic activity to be observed. None of the carboxylic acids were active which could have been due to failure of the compounds to enter the breast cancer cells and reach the target site because of their polar nature. Compounds with -CHO and -CHCl2 functionalities were therefore selected for future SARs studies.
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  • Date Issued: 2012

Farm level institutions in emergent communities in post fast track Zimbabwe: case of Mazowe district

  • Authors: Chiweshe, Manase Kudzai
  • Date: 2012
  • Subjects: Land reform -- Zimbabwe -- History -- 21st century Land settlement -- Social aspects -- Zimbabwe Zimbabwe -- Social conditions -- 1980- Zimbabwe -- Economic conditions Zimbabwe -- Politics and government -- 1980-
  • Language: English
  • Type: Thesis , Doctoral , PhD
  • Identifier: vital:3308 , http://hdl.handle.net/10962/d1003096
  • Description: The thesis seeks to understand how emerging communities borne out of the Fast Track Land Reform Programme in Zimbabwe have been able to ensure social cohesion and social service provision using farm level institutions. The Fast Track Programme brought together people from diverse backgrounds into new communities in the former commercial farming areas. The formation of new communities meant that, often, there were 'stranger households'living next to each other. Since 2000, these people have been involved in various processes aimed at turning clusters of homesteads into functioning communities through farm level institutions. Fast track land reform precipitated economic and political crisis in Zimbabwe characterised by a rapidly devaluating Zimbabwean dollar, enormous inflation and high unemployment figures. This economic crisis has impacted heavily on new farmers who find it increasingly difficult to afford inputs and access loans. They have formed social networks in response to these challenges, taking the form of farm level institutions such as farm committees, irrigation committees and health committees. The study uses case studies from small-scale 'A1 farmers‘ in Mazowe district which is in Mashonaland Central Province. It employs qualitative methodologies to enable a nuanced understanding of associational life in the new communities. Through focus group discussions, in-depth interviews, narratives, key informant interviews and institutional mapping the study outlines the formation, taxonomy, activities, roles, internal dynamics and social organisation of farm level institutions. The study also uses secondary data collected in 2007-08 by the Centre for Rural Development in the newly resettled areas in Mazowe. The major finding of the study is that farmers are organising in novel ways at grassroots levels to meet everyday challenges. These institutional forms however are internally weak, lacking leadership with a clear vision and they appear as if they are transitory in nature. They remain marginalised from national and global processes and isolated from critical connections to policy makers at all levels; thus A1 farmers remain voiceless and unable to have their interests addressed. Farm level institutions are at the forefront of the microeconomics of survival among these rural farmers. They are survivalist in nature and form, and this requires a major shift in focus if they are to be involved in developmental work. The institutions remain fragmented and compete amongst themselves for services from government without uniting as A1 farmers with similar interests and challenges.
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  • Date Issued: 2012

An estimation of the effects of food aid on domestic food production and commercial food imports in Zimbabwe

  • Authors: Chiweta, Chenai
  • Date: 2012
  • Subjects: Food relief -- Zimbabwe , Food crops -- Zimbabwe , Agricultural productivity -- Zimbabwe , Humanitarian assistance -- Zimbabwe , Foreign exchange -- Zimbabwe , Food supply -- Zimbabwe
  • Language: English
  • Type: Thesis , Masters , MSc Agric (Agricultural Economics)
  • Identifier: vital:11175 , http://hdl.handle.net/10353/478 , Food relief -- Zimbabwe , Food crops -- Zimbabwe , Agricultural productivity -- Zimbabwe , Humanitarian assistance -- Zimbabwe , Foreign exchange -- Zimbabwe , Food supply -- Zimbabwe
  • Description: Food aid and domestic food production capacities in Zimbabwe have been compromised by the poor performance in the country’s agricultural sector, which has necessitated an increase in and a continual need for humanitarian assistance over the past decade. The country’s commercial cereal food import capacity has not been an exception as it has also been greatly affected by the poor performance of the agricultural sector and the shortage of foreign currency that hit the country in the past few years. Secondary data on food aid, commercial cereal imports and cereal food production was obtained from World Food Programme (WFP), Food and Agriculture Organisation (FAO), the Grain Marketing Board (GMB) of Zimbabwe and from Zimbabwe Statistics (ZimSTATS) databases. This time series data was then analysed in the Vector Autoregression (VAR) analysis. Trends observed in the time series data reveal that commercial cereal food imports and cereal food aid inflows to Zimbabwe had been increasing between 1988 and 2008. Domestic cereal food production levels however were observed to have been declining within the same period. The restricted VAR model which was specified to investigate the short and long term effects of food aid on food production and on commercial food imports in the country revealed a low statistically significant positive relationship between domestic food production and food aid volumes. Results from the model also indicated a negative relationship between commercial food imports and food aid volumes. This means that as food aid volumes to Zimbabwe increase, the volume of commercial cereal food imported into Zimbabwe falls. This result therefore suggests that food aid in the country had a displacement effect on commercial cereal food imports in the short term. The results of the Granger causality test and the estimation of the Impulse Response Functions also helped to confirm and reinforce these findings from the vector error correction model. The conclusions drawn from the study were that the responsiveness of domestic food supply, that is, cereal production, to food aid inflows in the short term has been elastic. That is to say, an increase in food aid inflows would influence an increase in the level of domestic food production in the short term. However, in the long term, findings confirm that food aid does indeed discourage domestic food production in the country. Also, for the relationship between food aid and commercial food imports, it can be concluded from the study findings that food aid in the short term has caused a reduction in commercial food imports whereas in the long term, food aid inflows have actually stimulated the commercial food import capacity. In recommendation, the Government of Zimbabwe, the private and public institutions as well as the Non-Governmental Organisations should partner and work together in defining the criteria for vulnerability assessment, food aid targeting and distribution, and in the implementation of strategies for ensuring national food availability. Such partnerships would help in ensuring the sustainability of food aid and food security in Zimbabwe, which is the main goal.
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  • Date Issued: 2012

An evaluation of the implementation of capacity building strategies in the provision of health services in the central region of Malawi

  • Authors: Chowawa, Rosemary Shanice
  • Date: 2012
  • Subjects: Medical care -- Malawi , Public health -- Malawi , Health services accessibility -- Malawi , Community development -- Malawi , Strategic planning -- Malawi , Human services -- Malawi , Administration , Capacity -- Capacity building , Efficiency -- Effectiveness , Management -- Public administration , Organising -- Planning , Policy making
  • Language: English
  • Type: Thesis , Masters , MPA
  • Identifier: vital:11673 , http://hdl.handle.net/10353/d1007122 , Medical care -- Malawi , Public health -- Malawi , Health services accessibility -- Malawi , Community development -- Malawi , Strategic planning -- Malawi , Human services -- Malawi , Administration , Capacity -- Capacity building , Efficiency -- Effectiveness , Management -- Public administration , Organising -- Planning , Policy making
  • Description: The purpose of the study was to evaluate the impact of implementing capacity building strategies on the provision of health services in the central region of Malawi. The study intended to determine why a lack of quality services is still prevailing in the health services in the central region despite implementing capacity building strategies aimed at improving the delivery of health services. In addition to this, to come up with recommendations to improve the implementation of the existing capacity building strategies so that the implementation results in the intended impact, that is efficient and effective provision of health services in the central region of Malawi. The studies reviewed what various scholars have written on capacity building in order to ground capacity building in Public Administration and provide the study with a conceptual, theoretical and legislative framework. This enabled the researcher to describe the nature and place of capacity building in Public Administration. It was evident from the review that the implementation of capacity building strategies is a systematic process which requires that chief officials follow all the steps in order to effectively and efficiently implement the capacity building strategies so that the intended impact is achieved. In this regard, capacity building is a management function which requires that chief officials play an enabling role by providing the necessary resources (both human and financial) and policies that support the implementation of capacity building strategies. The study used both quantitative and qualitative research methods whereby thirty-five respondents composed of political office-bearers and chief officials from Lilongwe, Dedza, Mchinji and Dowa districts and Ministry of Health Headquarters in the central region of Malawi were given self-administered questionnaires to complete. Face-to-face interviews and document analysis were also used as research methods. The intention was to determine the problems that are being experienced in the implementation of the existing capacity building strategies and find out if the strategies are resulting in the intended impact. The study findings confirmed that there are indeed problems being experienced in the implementation of the existing capacity building strategies, namely: inadequate human and financial resources, corruption, political interference, lack of consultation with stakeholders and lack of political will to make sure that the implementation of the capacity building strategies is effectively and efficiently done. It was also revealed that the implementation of the existing capacity building strategies is impacting negatively on the provision of health services in the central region of Malawi, hence indicating a need to change in approach. The study concludes that in order for the capacity building strategies to achieve the intended impact there is a need to broaden the scope of the legal framework on health capacity building strategies in Malawi, enforce the use of performance standards and improve the operational framework to gain efficiencies and effectiveness from current investments in capacity building.
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  • Date Issued: 2012

Effects of pre-slaughter sheep handling and animal-related factors on creatine kinase levels and physico-chemical attributes of mutton

  • Authors: Chulayo, Amanda Yucca
  • Date: 2012
  • Subjects: Sheep -- South Africa , Mutton , Slaughtering and slaughter-houses -- South Africa , Creatine -- Physiological effect
  • Language: English
  • Type: Thesis , Masters , MSc Agric (Animal Science)
  • Identifier: vital:11810 , http://hdl.handle.net/10353/433 , Sheep -- South Africa , Mutton , Slaughtering and slaughter-houses -- South Africa , Creatine -- Physiological effect
  • Description: Effects of pre-slaughter sheep handling and animal-related factors on Creatine Kinase levels and physico-chemical attributes of mutton By Chulayo Amanda Yucca The objective of the study was to determine the effects of pre-slaughter sheep handling and animal-related factors on Creatine kinase (CK) levels and physico-chemical characteristics of mutton from South African sheep breeds. One hundred and seventy-three castrated male sheep from four breeds (15 Dormer, 46 South African Mutton Merino, 77 Dorper and 35 Blackhead Persian) were used. The animals were grouped according to age categories. The grouping was as follows: Group 1 (6 ≤ 8 months), Group 2 (9 ≤ 12 months) and Group 3 (13 ≤ 16 months). Blood samples for CK determination were collected at exanguination using disposable vacutainer tubes. Representative samples of the Muscularis longissimuss thoracis et. lumborum (LTL) muscle were taken for the determination of ultimate pH (pHu), colour (L*-lightness, b*- redness and a*- yellowness), thawing and cooking losses and meat tenderness. Significant (P<0.01) breed effects were observed on CK levels with Dormer having the highest CK values. Significant linear relationships were observed between pre-slaughter condition and CK levels. There were positive correlations between colour coordinates L* and b* (r =+0.22) and between a* and b* (r =+0.63). Cooking loss and Warner Braztler Shear Force (WBSF) values were positively correlated (r =+0.29). The Principal Component Analysis (PCA) showed a significant variance for CK and between physico-chemical characteristics of mutton. There were no relationships between CK levels and physico-chemical characteristics of mutton. Significant breed and age effects on pHu, L, a*, b*, thaw %, CL and WBSF of mutton were observed. iv It was concluded that, pre-slaughter conditions affect CK levels and physico-chemical characteristics of mutton. However, there were no relationships between CK levels and physico-chemical characteristics of mutton.
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  • Date Issued: 2012

The treatment of brewery effluent using an integrated high rate algal ponding system

  • Authors: Cilliers, Anneke
  • Date: 2012
  • Subjects: Water -- Purification -- South Africa , Algae -- Biotechnology , Algae culture , Algae -- Economic aspects
  • Language: English
  • Type: Thesis , Masters , MSc
  • Identifier: vital:5331 , http://hdl.handle.net/10962/d1005177 , Water -- Purification -- South Africa , Algae -- Biotechnology , Algae culture , Algae -- Economic aspects
  • Description: The application of high rate algal ponds (HRAP) in the treatment of brewery effluent that met the South African Department of Water Affairs and Forestry's (DWAF) general limits for discharge into a natural water resource of 1998 were tested during a lO-month baseline phase, followed by an 11-month optimization phase. The objective of the baseline phase was to monitor the seasonal performance of HRAPs. The hydraulic retention time (HRT) fluctuated between 11.16 d and 12.00 d in HRAPs. The chemical oxygen demand (COD) increased from 130.12 ± 6.94 mg/L (post-AD), to 171.21 ± 7.99 mg/L (post-HRAP) . The presence of algal cells and evaporation contributed towards an increase in post-HRAP COD. The ammonia (NH₄-N) concentration decreased from 46.59 ± 2.47 mg/L (post-AD), to 1.08 ± 0.12 mg/L (post-HRAP). The nitrite (NO₂- N) concentration remained below 1.00 mg/L in post-pilot plant AD, post-PFP and post-HRAP effluent. The phosphate (PO₄-P) concentration decreased from 29.81 ± 1.39 mg/L (post-AD) to 17.30 ± 1.16 mg/L PO₄-P. The objective of the optimization phase was to manipulate the HRT to achieve the maximum treatment rate that met the DWAF general limits for discharge into a natural water resource of 1998. Nitrogen (as NH₄-N, NO₃-N, NO₂-N) removal efficiency was used as an indicator of nutrient removal success. HRT was influenced by season. The optimal HRT for autumn was 4.30 d at a temperature of 20.53ºC in HRAP A2 (heated) and 18.96ºC in HRAP B2 (ambient). The optimal HRT for summer was 2.74 d at 29.90ºC in HRAP A2 (heated) and 26.36ºC in HRAP B2 (ambient). The COD decreased from 152.33 ± 4.85 mg/L (post-AD) to 95 .00 ± 3.75 mg/L (post-HRAP A2), and to 100.82 ± 5.93 mg/L (post-HRAP B2). The incoming NH₄-N concentration decreased from 42.53 ± 1.38 mg/ L (post-AD), to 1.70 ± 0.81 mg/ L (post-HRAP) . The nitrate (NO₃-N) concentration post-HRAP was 12 - 14 mg/L. The main methods for NH₄-N removal were probably NH₄-N volatilization through algal uptake. HRAPs were able to lower nitrogen and phosphorous concentrations to within the DWAF limits under normal operating conditions. It is recommended that HRAP treated brewery wastewater be used for irrigation after salt removal, or alternatively, for groundwater recharge . Regulatory exemptions would be required for higher than permitted COD and EC concentrations to enable these actions.
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  • Date Issued: 2012
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