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Significance of accuracy in the orthographical development of isiXhosa in a post-democratic South Africa

  • Authors: Saul, Zandisile W.
  • Date: 2013-01
  • Subjects: Xhosa language , Xhosa language -- Orthography and spelling , Xhosa language -- Grammar
  • Language: English
  • Type: Doctoral theses , text
  • Identifier: http://hdl.handle.net/10353/23056 , vital:55325
  • Description: IsiXhosa language is one of the first languages in sub-Saharan Africa to be reduced into writing. The first written texts in isiXhosa were produced by British missionaries in the Tyhume river valley as early as 1824. In spite of these early developments, there still remain today many inconsistencies and anomalies with regard to the standardization of isiXhosa orthography that require attention. This research focuses on the status quo of the current orthography of isiXhosa which is used in the writing of the selected texts which were published from 2000 to date. The research study investigates how these texts are written, that is, whether they are written according to the principles of the writing of this language as developed by the respective language boards or not. The reason for doing this is that this language has become one of the official languages of the Republic of South Africa. Therefore, in order for it to be read and written without any difficulty by anyone, as it is expected to be used as a medium of instruction even at tertiary level in the future, it should be written accurately and consistently. The study analyses a number of isiXhosa written texts including the following: (1) Selected literary texts which were published from 2000 to date. (2) Selected publications by government departments. (3) Selected translated texts. (4) Some of the newspapers and magazines which are currently in circulation in this language. (5) Some dictionaries of isiXhosa. (6) The updated isiXhosa Orthography as compiled by the PanSALB (2008). The aims of the study are outlined in Chapter 1. This chapter also provides the theoretical framework within which the research is located. Chapter 2 is about the theoretical perspectives on the development of the art of writing and orthography. The historical background, that is, the development of the art of writing and the general as well as the specific requirements of a good orthography are discussed. Chapters 3, 4 and 5 observe and analyse the orthographical features of some written documents of isiXhosa such as writing of capital letters, word division, usage of concords, etc. These three chapters also observe and analyse the various anomalies and inconsistencies in the spelling of isiXhosa words that were identified in the consulted texts. Chapter 6 is devoted to the conclusion and the recommendations. , Thesis (PhD) -- Faculty of Social Science and Humanities,2013
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  • Date Issued: 2013-01

The impact of beliefs and values on agricultural change: a case of Murombedzi Irrigation Scheme, Zimbabwe

  • Authors: Nyika, Emery
  • Date: 2013-01
  • Subjects: Agriculture -- Environmental aspects , Farms, Small , Agricultural productivity
  • Language: English
  • Type: text
  • Identifier: http://hdl.handle.net/10353/25698 , vital:64469
  • Description: Since the mid 1970s there has been an increasing effort to raise the level of adoption of agricultural innovations in small-scale farming for improved production. NGOs and governments have engaged in a participatory approach not only to empower local people, but also to give them an opportunity to learn, access, and utilize innovations that have been introduced in the agriculture sector. However due to several factors small-scale farmers in Zimbabwe have failed to fully adopt these changes that would enhance their farming activities. Most of these farmers have rather preferred maintaining and practising their preliterate farming methods. Like most irrigation schemes Murombedzi Irrigation Scheme is self funded due to the fact that the government has failed to fund most of such projects. This has subsequently left projects such as the Murombedzi Irrigation Scheme to provide for their own agricultural needs. NGOs have in the past provided assistance to these small-scale farmers but mostly in cases of drought. This study is an assessment of the impact of beliefs and values on the adoption of agricultural change in Murombedzi Irrigation Scheme. The study investigates the extent to which beliefs and values have an effect on small-scale farmer’s access and utilization to adopting innovations. Research findings reveal that farming production in Murombedzi is low and the local farmers have been passive participants in gaining training and education that can assist them in gaining knowledge on the effectiveness of implementing innovations. However; the farmers prefer to maintain their traditional methods that have been effectively used by their fore fathers. It is a common belief among the informants that their ancestors are to be kept pleased at all times and this means practicing traditional farming which, for them, has proved to be effective in the past. As a result, this calls for an empirical research to be carried out at the grass roots level to explore the dynamics that influence the status quo on the ground. This study was conducted to help agricultural change to be implemented in small-scale farming for the benefit of agricultural production. The focus was on a local irrigation scheme that is self funded. Data was gathered using an ethnographic research design. , Thesis (MSoc) -- Faculty of Social Sciences and Humanities, 2013
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  • Date Issued: 2013-01

A critical analysis of the screen adaptation of Saule's Unyana womntu

  • Authors: Mbatsha,Thembisa
  • Date: 2012-12
  • Subjects: Motion picture authorship , Literature -- Adaptations
  • Language: English
  • Type: Master's theses , text
  • Identifier: http://hdl.handle.net/10353/23078 , vital:55400
  • Description: This research will concentrate on various aspects of the screen adaptation of “Unyana womntu” (Saule, 1989). This study comprises of six chapters. In Chapter 1 of this study, the research aims and objectives are formulated. The research methods that are to be followed will involve a thorough reading of the written text, as well as a comprehensive repetitive viewing of all the episodes of the screen version. In the final part of Chapter 1, background information is provided on the personal life of the author as well as on his contributions to the African literary tradition. Background information on the production of the screen version is also provided. In the Chapter 2, the theoretical aspects of the phenomenon of literary adaptation are discussed. This discussion provides a framework for the analysis of the adaptation of “Unyana womntu” (Saule, 1989) in the remaining chapters of this study. The aim of this chapter is to identify and discuss the most important principles which come into play when the written text is adapted into a screen production. Since the screen production belongs to the genre of the performing arts, this chapter is introduced with a discussion on the performing arts and on the drama, in particular. The section will be concluded with a discussion on the different sub-types of the drama which can be found, including the screen production. The main emphasis is on an analysis of the basic features and principles of the drama in screen format. Since the screen play Unyana Womntu (1998) is based upon a novel by the same title, the literary features of the novel are to be discussed here as well. The specific features of the Xhosa novel will also receive attention. In Chapter 3, the adaptation of the background of the novel “Unyana womntu” (Saule, 1989) into the screen production is critically evaluated. Aspects such as the adaptation of the macro-features as well as the micro-features of the background are identified and critically analysed Chapter 4 deals with the adaptation of the character element. This discussion takes place within a particular theoretical framework which defines the essential elements of characterization within the novel and within the drama respectively. It also deals with the manner in which each of these elements is subjected to the process of adaptation. The aim of Chapter 5 is to analyse the adaptation of the plot of “Unyana womntu” (Saule, 1989) from a written text into a screen production. This analysis is based upon a well-constructed theoretical framework that addresses the various aspects of the plot, as found within narrative texts. Chapter 6 contains a general conclusion which will finally present the observations and findings drawn from the entire study , Thesis (MA) -- Faculty of Social Science and Humanities, 2012
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  • Date Issued: 2012-12

Development & evaluation of modified lignocellulose-clinoptilolite composites for water treatment

  • Authors: Vala, Mavula Kikwe Remy
  • Date: 2012-12
  • Subjects: Lignocellulose , Lignocellulose -- Biotechnology
  • Language: English
  • Type: Doctoral theses , text
  • Identifier: http://hdl.handle.net/10353/24521 , vital:63051
  • Description: Municipalities, mining, textile and many other industries release wastewater into water bodies. Thus, the entire ecosystem (biota and abiota) including drinking water is affected by polluted effluents. The growing environmental concern over water pollution (due to inorganic and persistent organic compounds) attracts a significant amount of research in the removal of pollutants from water. In this study, lignocellulose and clinoptilolite were modified for the preparation of composites, with high adsorption properties, suitable for the removal of pollutants. Grass (Kikuyu grass) material was first treated with boiling water in order to remove soluble compounds and then with sulfuric acid in order to free functional groups within lignocellulose. The lignocellulose obtained was then chemically modified with three different siloxanes (3-aminopropyl-terminated poly (di)methylsiloxanes) of different molecular weights. For clinoptilolite, impurities were removed by reflux in hydrochloric acid before chemical modification with siloxanes. Grafting of siloxanes onto lignocellulose and clinoptilolite as well as the preparation of composites were successfully achieved by means of dibutyltin dilaurate (catalyst) after reflux under nitrogen. The modified materials were characterized by FT-IR, XRD, SEM and TGA and results confirmed successful modification of the materials. Solid state 29Si and 13C NMR were used to investigate the nature of the composite prepared with siloxane NH40D (CNH40D). The investigation revealed a possible bond between the modified lignocellulose and the modified clinoptilolite in the composite. The sorptive and/or ion exchange properties of the materials prepared for the removal of pollutants from water were then investigated. Phenol red, used motor (engine) oil and cyanide were used (with regard to textile, oil spill and gold mining effluents respectively) to simulate water pollution in the laboratory. It was found that adsorption properties of lignocellulose were significantly increased after sulfuric acid treatment, suggesting the availability of lignocellulose functional groups as adsorption sites. When further modified with siloxanes, lignocellulose showed less efficiency in adsorbing phenol red. The general mechanism of phenol red uptake onto lignocellulose and clinoptilolite modified with siloxane or composites was: rapid initial adsorption, slow uptake, small rate increase and then equilibrium. The mechanism of phenol red uptake could be well represented by the pseudo second-order kinetic model with equilibrium being reached after a period of time, ranging between 1-5 hours. The linear Langmuir model was the best model for describing adsorption of phenol red onto lignocellulose modified with siloxanes and composites while the Freundlich model appeared to be best for clinoptilolite modified with siloxanes. The general mechanism of used motor oil uptake onto lignocellulose and clinoptilolite modified with siloxane or composites was: rapid uptake, equilibrium and the process occurs over a short period (10 min). The pseudo second-order kinetic model appeared to be the best representation of this adsorption. The linear Langmuir isotherms are the best fitted model for used motor oil uptake onto the adsorbents prepared. Adsorption of cyanide occurred very quickly (10 to 30 min). For lignocellulose and clinoptilolite modified with siloxanes, desorption occurred soon after adsorption and thus no kinetic model nor isotherms of adsorption were deduced. However, adsorption of cyanide onto composites could be represented by the pseudo second-order kinetic model. Nanofibres were fabricated by electrospinning of the modified lignocellulose and composites by blending them with PAN in a solvent mixture of DMF-DMSO. Nanofiltration was achieved by packing the nanofibres prepared into a pipette and filtering polluted water. Nanofiltration was assessed by measurement of the turbidity of water which dropped from 63 NTU for polluted water to 3.06 NTU for filtered water. , Thesis (PhD) -- Faculty of Science and Agriculture, 2012
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  • Date Issued: 2012-12

Examining learners' and teachers' perceptions of the relationship between school infrastructure and learners' performance in Fort Beaufort Education District, Eastern Cape Province, South Africa

  • Authors: Ajibade, Benedicta Aremevbemi
  • Date: 2012-12
  • Subjects: School facilities , Education and state -- South Africa
  • Language: English
  • Type: Master's theses , text
  • Identifier: http://hdl.handle.net/10353/24695 , vital:63526
  • Description: This study examined learners’ and teachers’ perceptions of the relationship between school infrastructure and learners’ performance in Fort Beaufort Education District, Eastern Cape. The study arose from a concern that, despite South African Government’s commitment to funding the renovation of some old and dilapidated school buildings and constructing new ones so that there would be an improvement in both teaching and learning in affected secondary schools. Regrettably, most school buildings remain in deplorable conditions. There has been poor learner performance at all levels of the secondary education system in some rural areas of the Eastern Cape Province. Learners’ performance in the Province’s high schools has been described as the worst in the country. From the literature, it appears that no thorough and conclusive studies looking into the issues relating to school buildings and learners’ performance as perceived by learners and teachers in South Africa have been conducted. Hence, the researcher was motivated to examine the relationship between school buildings and learners’ performance. The study was placed within the post-positivism paradigm and used a mixed method research design that incorporated concurrent procedures in the collection, analysis and interpretation of the data. Likert-scale questionnaires were used to collect quantitative data while qualitative data were collected through interviews and observations. A total of 240 learners completed the questionnaire. The researcher conducted 48 brief interviews (36 with teachers and 12 with school principals) from 12 selected secondary schools. Furthermore, the researcher made observations to assess the state of the buildings. At school level, the study revealed that most of the school buildings were in deplorable condition. The teaching and learning environment also compounded the problem of poor learners’ performance. Learners’ motivation/morale, health and safety were not guaranteed in most of the schools, and teachers’ expressed difficulty in performing their job effectively. Large classes, lack of teaching and learning resources, and limited infrastructure were some of the factors hindering teaching and learning at school level. Results obtained from the study showed that the principals and teachers perceived strong links between the condition of their school buildings and learners’ performance. About half of the learners perceived some link between the condition of their schools and their academic performance. The study observed that the majority of school buildings were old and in very bad conditions with few under renovation from the Correctional service department. The study also showed that most schools lack recreational facilities, do not have electricity, laboratories, library and water. Most of the educators are unhappy about their work environment and are not motivated. The study has put forth recommendations for educational planners and for policies regarding the funding norms. Furthermore, based on the findings of the study, there is need for collaborative effort among educational stakeholders to ensure adequate and appropriated delivery of school infrastructure specifically school building that will translate into improved teaching practice at school level and better learners’ performance. , Thesis (MEd) -- Faculty of Education, 2012
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  • Date Issued: 2012-12

Integrating legacy applications into service oriented architecture middleware

  • Authors: Makamba, Makaziwe https://orcid.org/0000-0001-6998-4480
  • Date: 2012-12
  • Subjects: Service-oriented architecture (Computer science) , Computer architecture
  • Language: English
  • Type: Master's theses , text
  • Identifier: http://hdl.handle.net/10353/24294 , vital:62599
  • Description: Information and Communication Technology (ICT) is a dynamic approach that is widely recognized as an innovative and powerful tool for socio-economic development, it is a key catalyst for the emergence of knowledge economy. ICT have been used to develop applications, promote transparency and efficiency in multiple services such e-Learning, e-Government, e-Health and e-Judiciary especially for Marginalized Rural Areas (MRAs). The ICT approach is designed to bridge the digital divide. This approach has been widely deployed in many programs and it has led to the development of a new field which is Information and Communication Technology for Development (ICT4D). Within the context of ICT4D there are arrays of e-services that have been deployed to improve the impoverished communities. Some of these applications have failed to bring the changes that were designed to bring in the community due to the use of old architectures. There is therefore a need to develop a system that will integrate legacy applications into contemporary architectures. To solve the problem of the legacy applications we have developed TeleWeaver Service Oriented Architecture (SOA) middleware into which we integrate an e-Commerce and e-Learning applications into SOA middleware. For this integration system there are specific technologies that were used to integrate legacy applications into SOA middleware: RESTful web services using the slim API, SOAP via Nu-SOAP technologies were used to integrate these legacy applications. Specific methodologies were used to achieve the objectives of this research. The literature review, brainstorming, interviews and development of the system are some of the methods that were used to achieve the objectives of this study. The research methodology is mainly through experiments and to study TeleWeaver SOA middleware architecture. Interviews were conducted to analyze and understand the community needs, since the application discussed in this thesis is tested and implemented for a rural community. The community is called Dwesa, and falls under the ICT project within the Siyakhula Living Lab (SLL). A basic prototyping and Unified Modeling Language (UML) was created to design the system. This thesis presents the design and implementation of a system that integrates legacy applications into an SOA middleware that brings flexibility and effectiveness to these ICT e-services. The research focuses on integrating legacy applications into Service Oriented Architecture (SOA) middleware. It seeks to bring flexibility to e-services that are developed for MRAs. The use of SOA architecture that supports re-usability and interoperability of application provides effectiveness to the e-services. The novelty of the system is in its flexibility, usability and sustainability. SOA is an approach that provides a separation between the interface of the service and its underlying implementation. One of the achievements of the integration project is its ability to connect to SOA middleware. This increases the effectiveness of these e-services. The usability and performance evaluations are conducted to test and evaluate the system within the SLL on the TeleWeaver platform. , Thesis (MSc) -- Faculty of Science and Agriculture, 2012
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  • Date Issued: 2012-12

Preparation and characterisation of nanocomposite biodegradable films of hake fish gelatine and Na-montmorillonite

  • Authors: Mutize, Innocent
  • Date: 2012-12
  • Subjects: Nanocomposites (Materials) , Food -- Packaging
  • Language: English
  • Type: Master's theses , text
  • Identifier: http://hdl.handle.net/10353/24261 , vital:62595
  • Description: Hake fish (Merluccius paradoxus) based films were prepared using gelatine extracted from hake fish bones and skins. They were characterized using FTIR, TGA and XRD. Polyethylene glycol and distilled water were used as plasticizer and solvent respectively. Montmorillonite clay was also added to the film matrix at different concentration (1-13percent gelatine weight) to improve the films‟ functional properties. Fourier Transform Infrared (FTIR), Sodium Dodecyl Sulfate Polyacrylamide Gel Electrophoresis (SDS-PAGE) and Ultra Violet-Visible (UV-Vis) spectroscopy analysis were used to characterise gelatine extracted from hake fish bones and skins. The extraction time and temperature were varied between 30 mins to 120 mins and 45°C to 75°C respectively. The yields of the gelatines extracted at the stated conditions were calculated from the hydroxyproline content giving values of 30 to 39percent, 43 to 55percent and 50 to 57percent for extraction at 45°C, 60°C and 75°C respectively. The effect of polyethylene glycol content on the mechanical and barrier properties of hake fish gelatine films was also investigated. The addition of polyethylene glycol to the film solution increased the water vapour permeability from 0.0321 ± 0.0011 ng.m/m2.s.Pa to 0.0993 ± 0.0007 ng.m/m2.s.Pa between 5 and 35percent polyethylene glycol content and decreased tensile strength from 41.92 ± 2.17 MPa to 29.93 ± 0.17 MPa. Sodium treated Montmorillonite was incorporated in the hake fish gelatine film solution in order to assess the effect of Montmorillonite clay on the film mechanical, barrier and thermal properties. Hake fish gelatine-montmorillonite composite films were successfully prepared and characterized. X-ray Diffraction (XRD) and Fourier Transform Infrared (FTIR) analysis indicated that the Montmorillonite clay in the film matrices was in an exfoliated state. Water vapour permeability was reduced from 0.0312 ± 0.0016 ng.m/m2.s.Pa to 0.0081 ± 0.0001ng.m/m2.s.Pa and tensile strength improved from 29.93 ± 0.17MPa to 76.78 ± 1.13 MPa. , Thesis (MSc) -- Faculty of Science and Agriculture, 2012
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  • Date Issued: 2012-12

Success and challenges of regulatory policies in the small scale mining sector in Zimbabwe : the case of Empress community

  • Authors: Mapfumo, Chipo
  • Date: 2012-12
  • Subjects: Sustainable development $z Zimbabwe. , Economic development $z Zimbabwe. , Mineral industries $z Zimbabwe.
  • Language: English
  • Type: Master's theses , text
  • Identifier: http://hdl.handle.net/10353/29230 , vital:77616
  • Description: The focus of this study was on the successes and challenges of the regulatory policies in the small scale mining sector. This was achieved through analyzing the regulatory policies and strategies which are being employed in the small scale mining sector and the extend to which these policies have contributed towards attaining sustainable development. The research made use of one of the major approaches in the social sciences which is the qualitative method. The use of a qualitative technique reflects an attempt to ensure an in-depth understanding of the phenomena in question, that is, to understand the successes and challenges of the regulations so as to promote sustainable development. The study found that there has been an improvement and growth of the small scale mining sector since after independence in 1980. The amendments of the policies in independent Zimbabwe have paved a way for many small scale miners to register. A considerable number of the unemployed people have found a way to sustain their livelihoods. However there are still a number of challenges which need to be addressed on the policies so as to attain sustainable development. Some of the challenges included the lack of financial support from the government, lack of human resources in the stakeholders’ offices, knowledge gap, too many regulations and the absence of a policy which addresses the issues of small scale miners. The study calls for an independent body mandated by the government to deal with issues of small scale miners. A separate mineral policy and the strengthening of state support to enhance the potential the sector has for uplifting the lives of many people is also required. , Thesis (MSoc. Sci.) -- Faculty of Management and Commerce,2012
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  • Date Issued: 2012-12

The implementation of HIV and AIDS prevention programmes in three Universities in Zimbabwe

  • Authors: Muzenda, Denias https://orcid.org/0000-0002-6552-7319
  • Date: 2012-12
  • Subjects: Universities and colleges -- Health promotion services , AIDS (Disease) -- Prevention
  • Language: English
  • Type: Doctoral theses , text
  • Identifier: http://hdl.handle.net/10353/25022 , vital:63891
  • Description: Given the nature and devastating effects of HIV and AIDS and its impact on society, the universities in Zimbabwe have affirmed the need to define their institutional policy aimed at managing and mitigating the effects of HIV and AIDS. In this regard they have also put in place programmes to address the epidemic. Among the programmes are HIV and AIDS prevention programmes which are being implemented. However, there have been concerns that despite the fact that the programmes are being implemented as planned they have not met their objectives as HIV and AIDS infections have not decreased as expected. Hence this study assesses the implementation of HIV and AIDS prevention programmes in three universities in Zimbabwe. To achieve these objectives, the researcher opted for the mixed method methodology which is embedded in the post-positivist research paradigm. Post-positivist research paradigm attempts to increase our understanding of the way things are and that objectivity is an ideal that can never be achieved, and research is conducted with greater awareness of subjectivity. The researcher had to opt for questionnaires, interviews, document analysis and observations as data collecting instruments. From the Data presented the study found that universities lack adequately professionally qualified HIV and AIDS lecturers. Results on capacity of implementers in the study revealed that an insignificant number of lecturers have the capacity while the majority significant number lacked the capacity to implement the programmes. HIV and AIDS prevention is being implemented by unqualified lecturers who lack training and prerequisite skills for the programme. Furthermore, the study found that Lecturers do not get the necessary professional and institutional support to implement successfully HIV and AIDS programmes in universities. HIV and AIDS Coordinators and NGOs expressed concern over the inadequacy of learning and teaching support material. Funding and lack of resources such as specialist rooms and learning materials are a major impediment to successful implementation of HIV and AIDS. Implementation of HIV and AIDS programmes suffers from inadequate supervision by the relevant stakeholders due to unavailability of transport and financial cost. It also emerged that Human resource is also a major problem since there is a great staff turnover as specialist lecturers leave the system for better paid opportunities in the private sector. Most university lecturer respondents cited staff turnover as long-established and skilled lecturers look for greener pastures within and outside the country. The dominant methods used to implement HIV and AIDS programmes do not give enough room for group work discussions to effect behaviour change in students. Rather, more emphasis is on factual knowledge for assignments and examination purposes. On monitoring and evaluation of HIV and AIDS programmes, the study found that lecturers and students are unaware of their programmes progress bench marks. Universities have not been carrying out internal audits over the past years. This implies that the universities are divorced from Ministry of Higher Education Policy on monitoring and evaluation. Also, less people are involved in the monitoring process of HIV and AIDS programmes. The study found from the universities records that an HIV and AIDS Policy document exists at each university. However, the implementation of HIV and AIDS prevention programmes seemed to have a number of controversies and challenges. The study made the following recommendations against each major finding: Within the organisation, university works continually to equip staff with the knowledge, skills and tools required to analyse programme, implement and monitor interventions for HIV prevention. Capacity to support innovations includes aspects which hinder or support the implementation of new practices and ideas in the new curriculum. Universities should have trained HIV and AIDS Peer educators. For a lecturer to be considered as professionally qualified personnel in universities, the Ministry of Higher and Tertiary Education should stipulate possession of a Master‟s degree or a Doctorate. The researcher provided a section on contribution of the study to new knowledge whereby the researcher proposed an alternative model for HIV and AIDS implementation for universities in Zimbabwe. This model was derived after a thorough analysis of the findings from the study as well as an extensive literature review on the subject. Areas for further research have been suggested in this study. , Thesis (PhD) -- Faculty of Education, 2012
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  • Date Issued: 2012-12

An appraisal of community-based childcare practices in rural Malawi: The case of Malili Traditional Authority Area, Lilongwe District.

  • Authors: Alufandika,Dina
  • Date: 2012-11
  • Subjects: Tribal government , Child Welfare
  • Language: English
  • Type: Master's theses , text
  • Identifier: http://hdl.handle.net/10353/23259 , vital:56857
  • Description: The government of Malawi established the community based childcare (CBCC) programme with the aim of addressing early childhood problems and achieve national development in the long run. The CBCC programme, as one of the approaches to early childhood development (ECD), is guided by the national early childhood development policy. It promotes some practices that somehow deviate from the traditional childcare ways that communities have always known. Experience has shown that programmes that have elements of conflict with commonly held beliefs are bound to meet with resistance in society. The study employed a mini survey, focus group discussion, observation and document review to understand how the CBCC childcare practices in Malili intersect with commonly held beliefs about childcare as well as how they reflect on the national ECD policy. The study also focused on understanding the perceptions of community members on the CBCC programme. The study revealed that while some aspects of CBCC delivery conform to commonly held beliefs about childcare in the area under study, others diverge from such beliefs. Such convergence and divergence appear to be in line with the propositions of transformalist globalisation theory- one of the perspectives adopted for the study. The study also found that care practices at CBCC are not a true reflection of the national ECD policy as community members’ perceptions, poor community participation, poverty and lack of caregiver training in ECD contribute towards poor quality of care in CBCC, contrary to what is defined in the national ECD policy. The study also found that while both CBCC caregivers and sampled community members perceived the quality of care at the centers as poor, caregivers had a more positive perception towards the CBCC than community members. The study indicated that CBCC are centres of desperation for low economic status communities. Findings from the research have revealed that cultural values and commonly held beliefs, and exposure to new knowledge through globalisation play a role in determining childcare practices as well as perceptions towards them. In this sense the study has indicated that meanings that communities attach to development interventions influence their actions and perceptions towards it. , Thesis (MA) -- Faculty of Humanities of Social Sciences and Humanities, 2021
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  • Date Issued: 2012-11

Gender and affirmative action in South Africa: A case study on women empowerment in the Department of Education in Mthatha district offices.: subtitle if needed. If no subtitle follow instructions in manual

  • Authors: Mbatani, Mziwekaya Eric
  • Date: 2012-09
  • Language: English
  • Type: Masters theses , text
  • Identifier: http://hdl.handle.net/11260/3207 , vital:43188
  • Description: Abstract The main objective of this study has been to investigate the implementation of the affirmative action on the basis of gender balancing in the Department of Education in Mthatha District offices. The affirmative action policy is the program that seeks to remedy the past discrimination ideologies like on the bases of race and gender. Gender discrimination seemed to be the worst kind of discrimination in the past. Even within the same race, there are gender biases as well as within the same classes, women are treated differently. Some women are experiencing the impact of racial discrimination and class discrimination which puts women secondary of their same racial or same class male counterpart. Some men are experiencing only racial discrimination alone while others are experiencing class discrimination. Women serve the most severe discrimination of them all in the entire country of South Africa. Affirmative action has been used as a tool to eradicate all forms of discrimination. Hence its implementation needs to be evaluated to determine its impact on the eradication of discrimination, more especially sex discrimination. Evaluation has been made possible with the help of affirmative action measures which stipulate most of the principles of the affirmative action directed especially to the employers the gender balancing in the workplace is done with the aim of empowering and advancing women as their right according to gender equality. Women are experiencing the worst kind of social injustice have ever been practiced round the globe. Every woman is experiencing gender discrimination. Even in the rich family women are treated secondary by their male counterpart throughout their history of their living. In actual fact the presence of women in these family units is to help men help the men to have boys who will takeover the patriarchal duties assigned to every men as socialize to think and behave as the head of the families. If the family does not have boys who will later changed to be men, that family previously does run the risk of loosing the rights every households have where there are men. These girls to overcome the barriers of not having men and loose the right mention above they will marry men who will protect the right of their family. Previously, the family that did not have male will run the risk also of being robbed of their land and accused of black magic and the girls being raped. Some of the things that used to happen in the past are happening right now. Although women are promised the full dignity they deserve but some of the worst things that often happen to them in the past are still happening presently owing to the lack of political will to change the patriarchal system which is undermining the full dignity women deserve. This is viewed by Marxist feminists as being caused by the economic mode of production presently operating ‘capitalism’. The Marxist feminist suggests that there shall be no social justice if capitalism is still in place. Therefore they suggested that the only thing to eradicate is to eradicate the present form of production. The liberal feminist claim that the cause of the situation women found themselves is the unequal distribution of resource between men and women. Therefore they advocated that there should be equal rights between men and women as well as equal distribution of resources to men and women. Women must be empowered politically so as to have the equal voice like men. They must emanicipate themselves from the bondages of patriarchal ideologies. Women are just biological different from men but have equal mental capabilities as that of men. The equals should be treated equal and the unequals should be treated unequal. The differences we have should not be made as bases for treating others as unequal. The resources in our societies should be distributed equal among the demographics we have in our societies. The population of the country matters in terms of the countries prestige in terms of economic power. The more the population the country has the more powerful the country will be. In actual fact, the more productive the population of the country is the more productive the country will be. However, the less the productive the population of the country is, the lesser the productivity the country will be. Hence women should also be empowered economically. , Thesis (MMED) -- Faculty of HUMANITIES, SOCIAL SCIENCES and LAW, 2012
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  • Date Issued: 2012-09

Biological activities and mechanisms of action of two ethnobotanically selected South African medicinal plants on some bacteria associated with gastrointestinal infections

  • Authors: Olajuyigbe, Olufunmiso Olusola https://orcid.org/0000-0002-7889-0416
  • Date: 2012-08
  • Subjects: Medicinal plants , Herbs -- Therapeutic use , Gastrointestinal system
  • Language: English
  • Type: Doctoral theses , text
  • Identifier: http://hdl.handle.net/10353/25439 , vital:64249
  • Description: In this study, 36 plant species representing 24 families were found to be commonly used for the treatment of a variety of gastrointestinal disorders in Eastern Cape, South Africa. The family Fabaceae had the highest number of species. Out of these, 47.06percent were used in the treatment of dysentery alone while 46.15percent were used in the treatment of diarrhoea. Acacia mearnsii De Wild and Ziziphus mucronata subsp. mucronata Willd were selected for this research because they are extensively used in folkloric medicine in South Africa and there was lack of scientific reports that documented their biological activities. The phytochemical screening, antioxidant activities, in vitro antimicrobial activities, cytotoxicity, the synergistic potentials and mechanisms of actions of these plants were investigated. The phytochemical screening and the antioxidant activities of the two species showed that the quantity of the phenolic compounds, flavonoids and proanthocyanidins detected differ significantly in the various extracts. Of the aqueous, acetone, ethanolic and methanolic extracts of A. mearnsii, the ethanolic extract had the highest flavonoids while the acetone extract had the highest phenolic contents. The proanthocyanidins were highest in the methanol extract while aqueous extracts had the least phytochemicals. Aqueous extract showed the least ferric reducing power but methanol extract indicated the highest reducing power. The reducing power of the extracts was lower than those obtained from the reference standard such as butylated hydroxytoluene (BHT), rutin and ascorbic acid. 2,2’-azinobis-3-ethylbenzothiazoline-6-sulfonic acid (ABTS) diammonium salt showed that ethanol extract exhibited the highest antioxidant activity at the highest concentration tested. Also, 1,1-diphenyl-2-picrylhydrazyl (DPPH) assay indicated that ethanol extract had the highest radical scavenging activity at the lowest concentration and the activities of all the extracts decreased with increase in their concentrations. In Z. mucronata subsp. mucronata, the phenolics were significantly higher than the flavonoids and proanthocyanidin contents in all the extracts investigated. The ethanol extract had the highest antioxidant activity, followed by the acetone extract while the aqueous extract was the least active. Reacting with ABTS, the 50percent inhibitory concentrations (IC50) were (0.0429 ± 0.04 mg/ml) for aqueous, (0.0317 ± 0.04 mg/ml) for acetone and (0.0306 ± 0.04 mg/ml) for ethanol extracts while they inhibited DPPH radical with 50percent inhibitory concentration (IC50) values of 0.0646 ± 0.02 mg/ml (aqueous), 0.0482 ± 0.02 mg/ml (acetone) and 0.0422 ± 0.03 mg/ml (ethanol). The investigation showed that a positive linear correlation existed between the total phenolic content and antioxidant activity of the extracts and that these plants have strong antioxidant property and free radical scavenging capability. The in vitro antibacterial activities of Acacia mearnsii and Z. mucronata subsp. mucronata showed that their minimum inhibitory concentrations ranged between 0.039 mg/ml and 1.25 mg/ml. With the exception of acetone extract of A. mearnsii having MICs greater than 1.0 mg/ml for Enterococcus faecalis ATCC 29212 and Bacillus subtilis KZN, all other isolates had MICs less than 0.7 mg/ml. In all the bacteria treated with Z. mucronata subsp. mucronata extracts, Enterobacter cloacae ATCC 13047 had MIC greater than 1 mg/ml in methanol extract, Enterococcus faecalis ATCC 29212 and Staphylococcus aureus ATCC 6538 had MICs greater than 1 mg/ml in acetone extract while all other isolates were highly susceptible to the different extracts of Z. mucronata subsp. mucronata and had MICs less than 0.7 mg/ml. While aqueous extract was as active as the alcoholic extracts in A. mearnsii, that of Z. mucronata had no effect. The ethanol extracts exhibited the highest degree of antibacterial activity in both plants. This study, also, showed that the antifungal activity of A. mearnsii ranging 0.3125 – 5.0 mg/ml was higher than those of the different extracts of Z. mucronata subsp. mucronata ranging 1.25 – 10.0 mg/ml. It is evident from the results of the brine shrimp lethality assay that the crude extracts of A. mearnsii with the LC50 equaled 112.36 µg/ml and having the highest levels of toxicity (100percent) death at 500 μg/ml was non toxic (LC50 > 100 μg/ml) while the LC50 for Z. mucronata subsp. mucronata equaled 90.27 µg/ml indicated a low level of toxicity. The effects of combining the crude extracts of these plants with eight antibiotics were investigated by means of checkerboard and agar diffusion methods. On using the methanol extract of A. mearnsii, the agar diffusion assay showed that extract-kanamycin combination had zones of inhibition ≥ 20 ± 1.0 mm in all the bacteria tested (100percent), followed by extract chloramphenicol (90percent) > extract-ciprofloxacin = extract-tetracycline (70percent) > extract amoxicillin (60percent) > extract-nalidixic acid (50percent) > extract-erythromycin (40percent) > extract metronidazole (20percent). The checkerboard showed synergistic interaction (61.25percent), additivity/indifference (23.75percent) and antagonistic (15percent) effects. I, therefore, concluded that the antibacterial potentials of the antibiotics were improved and combining natural products with antibiotic could be a potential source of resistance-modifying agents useful against multi-drug resistant bacteria. The influences of these extracts on the ultrastructures, elemental components, protein and lipid leakages of five different bacteria were determined as the possible mechanisms of action of the extracts investigated. The scanning electron microscopy indicated varied ultrastructural changes in the morphology of bacterial cells treated with the extracts. The X-ray microanalysis showed significant differences between the elemental contents of extract-treated and untreated bacteria while lipids and proteins were leaked to a great extent from the extract-treated bacterial strains in comparison with the untreated ones. The possible mechanisms of action of the extracts may include inhibition of a significant step in peptidoglycan assembly, inhibition of metabolic processes, disruption of cell wall and cell membranes resulting in the efflux of lipid and protein in all the bacteria tested. The possible mechanism of action involved in the lipid and protein leakages in the bacterial cells could be attributed to lipid peroxidation and protein oxidation owing to the antioxidant activities of the extracts that were active beyond the protective levels. I concluded that the morphological changes and the observed leakages showed rapid killing, significant membrane depolarization resulting in leakages and efflux of disintegrated cellular materials. In general, this study has justified the ethnotherapeutic importance of A. mearnsii and Z. mucronata subsp. mucronata in the treatment of microbial infections by indicating the possible mechanisms of action of the crude extracts on the tested bacteria. , Thesis (PhD) -- Faculty of Science and Agriculture, 2012
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  • Date Issued: 2012-08

Bank finance in developing small and medium enterprise: an appraisal of relevent determinants in Rwanda

  • Authors: Gatabazi , Emmanuel Thomas
  • Date: 2012-04
  • Subjects: Economic assistance , Developing countries -- Economic conditions
  • Language: English
  • Type: text
  • Identifier: http://hdl.handle.net/10353/25096 , vital:63974
  • Description: This study examines the perceived non-availability of adequate bank financing to Small and Medium Enterprises (SMEs) with reference to Rwanda. Evidence from both developed and developing countries show that SMEs are more constrained in their operations and growth than large enterprises and access to finance features importantly among the constraints, with their proprietors typically perceiving finance as their most pressing input constraints. The problem is more severe in less developed countries like Rwanda. SMEs do not get adequate finance from financial systems despite their valuable contribution in the economic development of all nations across the globe. They are well recognized from their contribution to the socio-economic objectives of growth in employment generation, product output, export, and in their function as seed beds of entrepreneurship. This study aims to investigate the causes of the problem and what could be done to mitigate the problem. The primary objective of the study is to determine how to improve the availability of bank financing to SMEs in Rwanda. The argument is that there are SMEs internal factors that cause unavailability of bank financing. Understanding the causes of this problem is important to determining how to improve availability of credit to SMEs. For this purpose, the questionnaire was administered to 122 respondents from four commercial banks and 26 respondents from one development bank. All together 148 questionnaires were administered and 120 questionnaires returned. The response rate was 81 percent. Six major SMEs internal factors which included; business information, collateral, managerial competency, internal funds, networking and ethical practices were investigated to find out their impact on the availability of bank financing to SMEs. Quantitative data were analysed using a Statistical Package for Social Sciences (SPSS) with statistical tools including descriptive statistics, frequency distributions and chi-square test. The Cronbach’s alpha was used as a measure of reliability. While the data from the open-end question analysis involved classifying data, extracting themes, identifying patterns, tallying and quantifying responses and making generalization out of these patterns. This implies that the research methodology focused on the methods, tools and techniques used to assist in achieving the objectives of the study and answering the research questions that the research sought to address. To this end, the study sought the perceptions of bank staff on reasons why bank credit is not available to SMEs. The study focused on four research questions as outlined in chapter one and other relevant sections of the study. The major finding of this study is that there is a significant positive relationship between six SMEs internal factors (lack of business information, lack of collateral, lack of managerial competency, lack of internal funds, lack of networking and unethical practices) and non-availability of banks finance in Rwanda. On the basis of these findings, the study recommended that SMEs owners and staff should be trained in key strategic areas such as business management and financial management to effectively and efficiently manage their businesses and curb information asymmetry. The study also recommends that the government should introduce more practical guarantee facilities to enable banks access the funds as soon as the SME defaults. This will encourage bank to extend more credit to SMEs. Furthermore, the study suggests that the government should categorise SMEs as a priority sector and come up with a policy requiring banks to compulsorily ensure that a certain earmarked percentage of their overall lending is made to SMEs as a priority sector. Lastly, the study recommends that Rwanda Private Sector Federation should conduct trainings on ethical management to SMEs. Unethical behaviours such as deliberately not paying back loans should be heavily punished to limit occurrences of these behaviours among SMEs which may results in huge stock of non-performing loans. , Thesis (PhD) -- Faculty of Management and Commerce, 2012
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  • Date Issued: 2012-04

Market potential and profitability of improved maize open pollinated varieties in the Eastern Cape, South Africa

  • Authors: Sibanda, Melusi
  • Date: 2012-04
  • Subjects: Hybrid corn , Crops -- Effect of stress on
  • Language: English
  • Type: Master's theses , text
  • Identifier: http://hdl.handle.net/10353/24598 , vital:63211
  • Description: Maize is one of the most important crops grown by smallholder farmers in Amatole and O.R. Tambo Districts of the Eastern Cape. For this study, there were 13 maize varieties that were evaluated extensively by on-farm trials in selected areas under dry land and irrigated conditions. Nine were newly introduced and improved Open Pollinated Varieties (OPVs), while four were locally grown varieties. Among the locally grown varieties, one was a hybrid-check, while the remaining three were improved OPVs. The objectives of this study were: to investigate the potential marketability of newly introduced maize OPVs, identify factors influencing farmers‟ demand of improved maize OPVs and assess their profitability when compared with hybrids. One hundred and thirty seven sample households were interviewed using a structured questionnaire. The data was analyzed using descriptive statistics (frequency, percentages), gross margins and regression analyses. Data for computing gross margins was taken from the on-farm trials. Results showed that the actual production of improved maize OPVs constituted 0percent in Zanyokwe Irrigation Scheme (ZIS) and 20percent of the farmers in the O.R. Tambo District. At Silwindlala Women‟s Project (SWP), the improved maize OPV (Sahara) was grown. The majority of the farmers in the study areas were growing competitor varieties (hybrids and/or in conjunction with landraces). Results show that, there is potential market for improved maize OPVs in the Eastern Cape. The majority of the farmers, 87percent and 92percent in Amatole (SWP and ZIS) and O.R. Tambo Districts respectively, indicated that they were willing to adopt the newly introduced maize OPVs. Results showed that the hybrid PAN 6479 variety in general performed better than improved maize OPVs whereas in some areas, the improved maize OPVs had better gross margins and gross profit margins than the hybrid variety. The indicated genotypes did not show specific adaptation to selected environments. The demand model that employed a multiple regression model was used and data was analyzed using Statistical Package for the Social Science (SPSS) computer software. Results of the multiple regression model showed that household socio-economic factors (extension contact, access to credit, availability of household income, proportion of land area under cultivation, proportion of land area under (hybrids and landrace) and perceptions on seed color) and an input market factor (availability of the improved maize OPV seeds on the local shops) were the most important factors influencing farmers' decisions to demanding the improved maize OPVs. Extension contact, access to credit, level of household income and proportion of land area under cultivation, positively influenced the demand for the improved maize OPVs whereas the unavailability of the improved maize OPV seeds on the local shops, proportion of land area under hybrids and landraces and perceptions on seed color negatively influenced the demand for the improved maize OPVs. , Thesis (MSc) -- Faculty of Science and Agriculture, 2012
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  • Date Issued: 2012-04

Performance monitoring and evaluation for sustainable public service delivery: the case for the South African police service

  • Authors: Reddy, Michael
  • Date: 2012-04
  • Subjects: Performance -- Evaluation , Civil service -- Labor productivity
  • Language: English
  • Type: Doctoral theses , text
  • Identifier: http://hdl.handle.net/10353/24399 , vital:62767
  • Description: The public service which is the delivery arm of government, has to rise constantly to the massive challenge of service delivery to ensure that government achieves its ideal of creating a better life for all in accordance with the people’s contract. The research analyzed the question: To what extent can monitoring and evaluation of performance provide sustainable public service delivery by the public sector? Against this milieu, the study examined the monitoring and evaluation approaches adopted by the governments of Mexico and Spain (international) and South Africa (local). Further, an analogous of both the international and local experiences was conducted in the study. The state of service delivery was examined by studying the South African Police Service. It was evidenced in the study that sustainable service delivery in the SAPS is influenced by various factors, such as performance monitoring and evaluation. Although the SAPS reported the successful achievement of certain performance targets relating to its planned activities and financial performance, it became clear that the performance monitoring and evaluation framework is not adequate to effectively address the service delivery expectations in the South African context. This thesis presents an inclusive and comprehensive approach towards performance monitoring and evaluation, which seeks to shape the South African Police Service’s current framework positively towards promoting sustainable service delivery. The features of this new proposed approach include the involvement and/ or meaningful consultation with the broad South African community, effective communication; promotion of accountability; professional and ethical standards; and expansion and development of the current and future leadership at all levels in the organization. Further, a call for greater regional and international cohesion is made, to benchmark best practices relating to performance monitoring and evaluation; this was found necessary, as a global effort is required to successfully prevent and realize a significant reduction in crime levels. The study finally presents an alternative In year Monitoring Model (IYMM) to manage the budget performance against the predetermined plan. It links the key performance areas, as contained in the cost centre’s business plan to the allocated budget; produces unique projected spending patterns (PSP) for each cost centre; thereby propelling departments from old paradigms of monitoring financial performance. The IYMM provides management with an excellent tool to monitor and evaluate performance during the year. The performance monitoring and evaluation approach and the IYMM developed in this study are flexible and adaptable, as it can be applied successfully in other government departments locally, regionally and internationally. The thesis thus proposes a pragmatic approach towards performance monitoring and evaluation that promotes sustainable service delivery in South Africa. , Thesis (PhD) -- Faculty of Management and Commerce, 2012
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  • Date Issued: 2012-04

The impact of women in the ward development committees: a case study of Nkonkobe Municipality Alice, Eastern Cape

  • Authors: Maama, T A
  • Date: 2012-04
  • Subjects: Leadership in women -- South Africa -- Eastern Cape , Sex discrimination against women -- South Africa -- Eastern Cape , Women executives -- South Africa -- Eastern Cape
  • Language: English
  • Type: Master's theses , text
  • Identifier: http://hdl.handle.net/10353/29119 , vital:76644
  • Description: Customarily, men have always been regarded as superior to women and they were accorded more opportunities than women. This imbalance placed women at the receiving end and it impacted negatively on their socio-economic rights such as education. Women were also not allowed to be in decision-making nor hold any positions in both public and private sphere. However, a number of international instruments call for the inclusion of women in decision-making bodies and most countries have many women in decision-making now. This study revealed that women in leadership positions are agents of change nationally, regionally and internationally. In Nkonkobe Municipality, the study concealed that the impact of women in decision-making is remarkably significant, as women have not only brought about social changes and addressed the needs of other women and children in the society but they have also worked hard in fighting poverty in the communities. However, patriarchy, culture, lack of education and lack of funds are the major obstacles to women‟s visibility in the ward committees and in decision-making. The study recommends that men should support women as their equal counterparts instead of opposing them. Further, women must have confidence in themselves and they should also support one another instead of supporting men. In addition, Municipalities should have women friendly policies and they should implement them to empower women. , Thesis (MA) -- Faculty of Law, 2012
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  • Date Issued: 2012-04

Synthesis, characterization and antibacterial studies of metal complexes of substituted thiourea

  • Authors: Zulu, Happy Nonkululeko
  • Date: 2012-03
  • Subjects: Complex compounds , Halides , Ligands
  • Language: English
  • Type: Master's theses , text
  • Identifier: http://hdl.handle.net/10353/24327 , vital:62636
  • Description: Eighteen complexes Co(II), Cu(II), Zn(II), and Fe(III) with phenylthiourea, diethylthiourea, disopropylthiourea and dimethylthiourea were synthesized and characterized by elemental analysis, UV-Vis, FTIR, conductivity measurements. The complexes were formulated as either four coordinate for the metal(II) or six coordinate for Fe(III). The proposed formulations are consistent with the spectroscopic data for the complexes. The single crystal X-ray structure of the Zn(II) complex of phenylthiourea, Co(II) complex of diethylthiourea and Zn(II) complex of diisopropylthiourea are also reported. The X-ray crystal structures for these complexes revealed distorted tetrahedral geometry around the metal ions showed that the metal ions are coordinated to two molecules of the substituted thiourea through the sulphur atom and two either acetates or chlorides ions complete the four-coordinate geometry. The in vitro antibacterial activity of the complexes was studied against six bacterial strains using disc diffusion and broth micro-dilution methods. The complexes showed selective antibacterial activity. , Thesis (MSc) -- Faculty of Science and Agriculture, 2012
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  • Date Issued: 2012-03

The relationship between exports and economic growth: an empirical case study of the South African automobile industry

  • Authors: Taylor, Nina-Mari
  • Date: 2012-03
  • Subjects: Exports , Automobile industry and trade -- South Africa
  • Language: English
  • Type: Master's theses , text
  • Identifier: http://hdl.handle.net/10353/26313 , vital:65237
  • Description: The dissertation investigates the relationship between automobile exports and economic growth in South Africa. Given the amount of investment and government assistance that has gone into assisting and developing the South African automobile industry via the Motor Industry Development Programme, this study examines whether the increase in automobile exports has impacted on economic growth. A demand-side model of the Export-Led Growth hypothesis is estimated in order to analyse the magnitude of the impact of automobile exports on growth. The results of the VECM and Dynamic Granger Causality test reveal that vehicle exports have a long-run positive impact on economic growth and that a uni-directional causal relationship is found to run from vehicle exports to economic growth. Even though vehicle exports are found to have a relatively significant impact on economic growth, domestic demand factors are concluded as being the key contributor of economic growth in South Africa. , Thesis (MCom) -- Faculty of Management and Commerce, 2012
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  • Date Issued: 2012-03

4-Azidoaniline-based electropolymer as a building block for functionalisation of conductive surfaces

  • Authors: Coates, Megan , Elamari, Hichem , Girard, Christian , Griveau, Sophie , Nyokong, Tebello , Bedioui, Fethi
  • Date: 2012
  • Subjects: To be catalogued
  • Language: English
  • Type: text , article
  • Identifier: http://hdl.handle.net/10962/244404 , vital:51254 , xlink:href="https://doi.org/10.1016/j.jelechem.2012.01.001"
  • Description: We propose in this work to compare three approaches using 4-azidoaniline combined with “click” chemistry and electrochemistry to anchor ferrocene moieties at glassy carbon surfaces. The immobilisation of a newly synthesised molecule, 4-(4-ferrocenyl-1H-1,2,3-triazol-1-yl)aniline, through direct electropolymerisation or via in situ diazotization followed by electrografting is studied by analysing the samples by XPS and electrochemistry.
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  • Date Issued: 2012

A comparative study on the sensitive detection of hydroxyl radical using thiol-capped CdTe and CdTe/ZnS quantum dots

  • Authors: Adegoke, Oluwasesan , Nyokong, Tebello
  • Date: 2012
  • Subjects: To be catalogued
  • Language: English
  • Type: text , article
  • Identifier: http://hdl.handle.net/10962/242778 , vital:51077 , xlink:href="https://doi.org/10.1007/s10895-012-1089-2"
  • Description: Four types of water-soluble luminescent quantum dots (QDs) whose surface was functionlaized with thioglycolic acid (TGA), 3-mercaptopropionic acid (MPA), or glutathione (GSH), were investigated for the sensitive and selective detection of hydroxyl radical (●OH) in aqueous media. It was found that the type of capping agent and QD influenced the sensitivity of the probe. The order of sensitivity of the probe was: GSH-CdTe@ZnS > MPA-CdTe@ZnS > TGA-CdTe > MPA-CdTe QDs. Under the optimum conditions, a limit of detection as low as 8.5 × 10-8 M was obtained using GSH-CdTe@ZnS. The effects of foreign reactive oxygen species and the Fenton reactants and products as possible interferences on the proposed probe were negligible for CdTe@ZnS QDs. Besides, experimental results indicated that CdTe@ZnS QDs were more attractive for the selective recognition of ●OH than CdTe QDs. The mechanistic reaction pathway between the QDs and ●OH is proposed.
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  • Date Issued: 2012
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