How on-line publishing contributes to democracy, press freedom and the public sphere: a case study of Nyasatimes online and The Daily Times newspaper in Malawi
- Authors: Kakhobwe, Penelope
- Date: 2009
- Subjects: Daily Times (Malawi) Nyasatimes (Malawi) Democracy -- Malawi Freedom of the press -- Malawi Journalism -- Political aspects -- Malawi Online journalism -- Malawi Electronic newspapers -- Malawi Electronic publishing -- Malawi
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3441 , http://hdl.handle.net/10962/d1002895
- Description: Since the demise of the Berlin Wall and communism, many African countries have adopted a Western-model democracy as a system of governance. However, the media has not been liberalised to reflect this new discourse as constraints in many African countries pertaining to press freedom still exist. The internet appears to have the potential to challenge the political power of governments (Tsagarousianou, 1998:167). It has been posited that it has the potential to offer more platforms for information especially in the case of restrictive media environments. This study set out to investigate the impact of on-line publishing in Malawi. It explored how the emergence of this new form of publishing through the internet has affected the public sphere, democracy and press freedom in Malawi. The main focus was the level of press freedom at on-line newspapers as compared to traditional newspapers. It used the public sphere theory and literature on the internet as a technology of freedom as its theoretical framework. Using a case study approach by focusing on two newspapers; Nyasatimes on-line and Daily Times, the study used the coup plot coverage in May 2008 in Malawi by both newspapers as reference for the measurement of the level of press freedom. The study used qualitative content analysis and semi-structured interviews as its research methods. The research revealed that Nyasatimes enjoys more freedom to publish and therefore appears to have more press freedom than its more traditional counterpart. However, Nyasatimes also faces some unique challenges. The findings also revealed that press freedom in Malawi is not only affected by government through legislation but other factors and players as well play a central role in determining the level of press freedom for traditional media. The study therefore concludes that despite the internet’s ability to transcend local regimes of authority and censorship pertaining to press freedom, the challenges facing traditional media still need to be addressed as it is the primary source of information for most people in Malawi with on-line newspapers being simply supplementary.
- Full Text:
- Date Issued: 2009
- Authors: Kakhobwe, Penelope
- Date: 2009
- Subjects: Daily Times (Malawi) Nyasatimes (Malawi) Democracy -- Malawi Freedom of the press -- Malawi Journalism -- Political aspects -- Malawi Online journalism -- Malawi Electronic newspapers -- Malawi Electronic publishing -- Malawi
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3441 , http://hdl.handle.net/10962/d1002895
- Description: Since the demise of the Berlin Wall and communism, many African countries have adopted a Western-model democracy as a system of governance. However, the media has not been liberalised to reflect this new discourse as constraints in many African countries pertaining to press freedom still exist. The internet appears to have the potential to challenge the political power of governments (Tsagarousianou, 1998:167). It has been posited that it has the potential to offer more platforms for information especially in the case of restrictive media environments. This study set out to investigate the impact of on-line publishing in Malawi. It explored how the emergence of this new form of publishing through the internet has affected the public sphere, democracy and press freedom in Malawi. The main focus was the level of press freedom at on-line newspapers as compared to traditional newspapers. It used the public sphere theory and literature on the internet as a technology of freedom as its theoretical framework. Using a case study approach by focusing on two newspapers; Nyasatimes on-line and Daily Times, the study used the coup plot coverage in May 2008 in Malawi by both newspapers as reference for the measurement of the level of press freedom. The study used qualitative content analysis and semi-structured interviews as its research methods. The research revealed that Nyasatimes enjoys more freedom to publish and therefore appears to have more press freedom than its more traditional counterpart. However, Nyasatimes also faces some unique challenges. The findings also revealed that press freedom in Malawi is not only affected by government through legislation but other factors and players as well play a central role in determining the level of press freedom for traditional media. The study therefore concludes that despite the internet’s ability to transcend local regimes of authority and censorship pertaining to press freedom, the challenges facing traditional media still need to be addressed as it is the primary source of information for most people in Malawi with on-line newspapers being simply supplementary.
- Full Text:
- Date Issued: 2009
Factors enabling and constraining ICT implementation in schools: a multiple case study of three secondary schools in Lesotho
- Authors: Kalake, Matsitso
- Date: 2009
- Subjects: Education -- Lesotho Computer-assisted instruction -- Lesotho Information technology -- Lesotho Educational technology -- Lesotho Education, Secondary -- Lesotho -- Data processing Education -- Lesotho -- Computer network resources Educational innovations -- Lesotho Educational change -- Lesotho
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1858 , http://hdl.handle.net/10962/d1004539
- Description: This study focused on the implementation of ICTs in secondary schools in Lesotho. The main question addressed was: What are the enabling and constraining factors in the implementation of ICTs in schools? The work was undertaken in recognition of the fact that schools in the country were autonomously acquiring computers and using a variety of curricula without much coordination and policies from the government. There were factors encouraging schools to delve into this educational change: and challenges were already evident. This required further investigation. The research approach commenced with a critical review of the literature. Literature was drawn from developed and developing countries in order to understand the process of ICT implementation from a variety of contexts. The enquiry about the implementation process in all the countries focused on the rationale behind the use of ICTs in schools. ICT policies guiding implementation, principal leadership, teacher professional development and ICT resources. The literature review was followed by case studies of three secondary schools in Mafeteng district in Lesotho. Using both qualitative and quantitative methods of research, the study sought to determine from key people in three case study schools their overall understanding of how the process of implementation was carried out and what they perceived as enablers and constraints. The findings revealed that planning, access arrangements, training, support and to a lesser extent resources played a role in either impeding or encouraging the key ICT implementers at school and classroom level. Additionally, the key role of the principal and the MoE were highlighted in the study.
- Full Text:
- Date Issued: 2009
- Authors: Kalake, Matsitso
- Date: 2009
- Subjects: Education -- Lesotho Computer-assisted instruction -- Lesotho Information technology -- Lesotho Educational technology -- Lesotho Education, Secondary -- Lesotho -- Data processing Education -- Lesotho -- Computer network resources Educational innovations -- Lesotho Educational change -- Lesotho
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1858 , http://hdl.handle.net/10962/d1004539
- Description: This study focused on the implementation of ICTs in secondary schools in Lesotho. The main question addressed was: What are the enabling and constraining factors in the implementation of ICTs in schools? The work was undertaken in recognition of the fact that schools in the country were autonomously acquiring computers and using a variety of curricula without much coordination and policies from the government. There were factors encouraging schools to delve into this educational change: and challenges were already evident. This required further investigation. The research approach commenced with a critical review of the literature. Literature was drawn from developed and developing countries in order to understand the process of ICT implementation from a variety of contexts. The enquiry about the implementation process in all the countries focused on the rationale behind the use of ICTs in schools. ICT policies guiding implementation, principal leadership, teacher professional development and ICT resources. The literature review was followed by case studies of three secondary schools in Mafeteng district in Lesotho. Using both qualitative and quantitative methods of research, the study sought to determine from key people in three case study schools their overall understanding of how the process of implementation was carried out and what they perceived as enablers and constraints. The findings revealed that planning, access arrangements, training, support and to a lesser extent resources played a role in either impeding or encouraging the key ICT implementers at school and classroom level. Additionally, the key role of the principal and the MoE were highlighted in the study.
- Full Text:
- Date Issued: 2009
The experiences of women of their HIV/AIDS status disclosure to sexual partners: an exploratory study of Magunje township, Zimbabwe
- Kambarami, Maureen Cresencia
- Authors: Kambarami, Maureen Cresencia
- Date: 2009
- Subjects: Rural women -- Zimbabwe , Promiscuity -- Zimbabwe , HIV-positive women -- Zimbabwe , AIDS (Disease) in women -- Zimbabwe
- Language: English
- Type: Thesis , Masters , M SW
- Identifier: vital:11757 , http://hdl.handle.net/10353/231 , Rural women -- Zimbabwe , Promiscuity -- Zimbabwe , HIV-positive women -- Zimbabwe , AIDS (Disease) in women -- Zimbabwe
- Description: The African continent has been hit the hardest by the HIV/AIDS epidemic which has seen more women becoming infected than men (Hunter, 2003; UNAIDS, 2004). This has been attributed to the permissible nature of the African culture which is lenient on male promiscuity (Foreman, 1999; Colvin 2000; Leclerc-Madlala 2001; Dube 2003). African women are not only vulnerable to infection but are also vulnerable to negative disclosure experiences when they disclose their status to sexual partners. This double impact of culture has not been addressed by past researches (UNAIDS 2004). The present research thus attempts to fill that gap. It explores the interplay between culture and HIV transmission as well as the interplay between culture and disclosure experiences. The study’s setting is Magunje Township, a rural village in Mashonaland Central province in Zimbabwe. Taking into consideration the limitations of the present analysis, data gathered indicates that African women are vulnerable to both HIV infection and negative disclosure experiences. Their vulnerability also hampers prevention and treatment efforts as it makes them decide to keep their status a secret from sexual partners for fear of losing the financial income tied to sexual partners. The present researcher concludes with some suggestions for policy makers and programme implementers, highlighting the importance of focusing on HIV/AIDS status disclosure as a prevention and treatment method in the absence of a cure for HIV.
- Full Text:
- Date Issued: 2009
- Authors: Kambarami, Maureen Cresencia
- Date: 2009
- Subjects: Rural women -- Zimbabwe , Promiscuity -- Zimbabwe , HIV-positive women -- Zimbabwe , AIDS (Disease) in women -- Zimbabwe
- Language: English
- Type: Thesis , Masters , M SW
- Identifier: vital:11757 , http://hdl.handle.net/10353/231 , Rural women -- Zimbabwe , Promiscuity -- Zimbabwe , HIV-positive women -- Zimbabwe , AIDS (Disease) in women -- Zimbabwe
- Description: The African continent has been hit the hardest by the HIV/AIDS epidemic which has seen more women becoming infected than men (Hunter, 2003; UNAIDS, 2004). This has been attributed to the permissible nature of the African culture which is lenient on male promiscuity (Foreman, 1999; Colvin 2000; Leclerc-Madlala 2001; Dube 2003). African women are not only vulnerable to infection but are also vulnerable to negative disclosure experiences when they disclose their status to sexual partners. This double impact of culture has not been addressed by past researches (UNAIDS 2004). The present research thus attempts to fill that gap. It explores the interplay between culture and HIV transmission as well as the interplay between culture and disclosure experiences. The study’s setting is Magunje Township, a rural village in Mashonaland Central province in Zimbabwe. Taking into consideration the limitations of the present analysis, data gathered indicates that African women are vulnerable to both HIV infection and negative disclosure experiences. Their vulnerability also hampers prevention and treatment efforts as it makes them decide to keep their status a secret from sexual partners for fear of losing the financial income tied to sexual partners. The present researcher concludes with some suggestions for policy makers and programme implementers, highlighting the importance of focusing on HIV/AIDS status disclosure as a prevention and treatment method in the absence of a cure for HIV.
- Full Text:
- Date Issued: 2009
Resilience in children experiencing voluntary parental absence
- Authors: Kana, Gudveig Kartveit
- Date: 2009
- Subjects: Children of working parents -- South Africa , Latchkey children -- South Africa , Children -- Family relationships , Work and family , Public welfare -- South Africa , Social service -- Government policy -- South Africa
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:9998 , http://hdl.handle.net/10948/1167 , Children of working parents -- South Africa , Latchkey children -- South Africa , Children -- Family relationships , Work and family , Public welfare -- South Africa , Social service -- Government policy -- South Africa
- Description: The South African White Paper for Social Welfare (1997:58) acknowledges the importance to children of living in a secure and nurturing family. Nevertheless, many families are unable to fulfil their parenting roles as a result of the increasing pressures in society. One of these pressures concerns the employment of parents. There is an increasing tendency for people to relocate to bigger cities where there are more job opportunities. This then results in many children being left in the care of grandparents or other relatives while the biological parents pursue job opportunities in other cities. The aim of this study was to enhance an understanding of children’s experiences of these voluntary parental absences and the factors that contribute to their resilience during this process. A qualitative, explorative, descriptive and contextual design was employed and seven primary school children (10-12 years) from Port Elizabeth participated in semi-structured interviews including drawings. Trustworthiness was ensured and data analysis was conducted by using Tesch’s model (in Creswell, 1998). Four themes were derived from the study: Children’s perception of a family, where the participants defined family according to characteristics of (amongst others) care and love; Children’s experiences of living with a substitute family, where there was a process of detachment from biological parents, attachment to the substitute family and present experiences in the new family; Resilience in children, where the participants revealed their ways of coping; and, lastly, Suggestions from the participants on how other children in the same situation could cope.
- Full Text:
- Date Issued: 2009
- Authors: Kana, Gudveig Kartveit
- Date: 2009
- Subjects: Children of working parents -- South Africa , Latchkey children -- South Africa , Children -- Family relationships , Work and family , Public welfare -- South Africa , Social service -- Government policy -- South Africa
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:9998 , http://hdl.handle.net/10948/1167 , Children of working parents -- South Africa , Latchkey children -- South Africa , Children -- Family relationships , Work and family , Public welfare -- South Africa , Social service -- Government policy -- South Africa
- Description: The South African White Paper for Social Welfare (1997:58) acknowledges the importance to children of living in a secure and nurturing family. Nevertheless, many families are unable to fulfil their parenting roles as a result of the increasing pressures in society. One of these pressures concerns the employment of parents. There is an increasing tendency for people to relocate to bigger cities where there are more job opportunities. This then results in many children being left in the care of grandparents or other relatives while the biological parents pursue job opportunities in other cities. The aim of this study was to enhance an understanding of children’s experiences of these voluntary parental absences and the factors that contribute to their resilience during this process. A qualitative, explorative, descriptive and contextual design was employed and seven primary school children (10-12 years) from Port Elizabeth participated in semi-structured interviews including drawings. Trustworthiness was ensured and data analysis was conducted by using Tesch’s model (in Creswell, 1998). Four themes were derived from the study: Children’s perception of a family, where the participants defined family according to characteristics of (amongst others) care and love; Children’s experiences of living with a substitute family, where there was a process of detachment from biological parents, attachment to the substitute family and present experiences in the new family; Resilience in children, where the participants revealed their ways of coping; and, lastly, Suggestions from the participants on how other children in the same situation could cope.
- Full Text:
- Date Issued: 2009
Rapid method for the quantitative determination of efavirenz in human plasma
- Kanfer, Isadore, Mogatle, Seloi
- Authors: Kanfer, Isadore , Mogatle, Seloi
- Date: 2009
- Language: English
- Type: Article
- Identifier: vital:6388 , http://hdl.handle.net/10962/d1006309
- Description: A pharmacokinetic interaction study between efavirenz (EFV), a non-nucleoside reverse transcriptase inhibitor used in the treatment of HIV-1 infection, and an African traditional medicine, African potato in human subjects was undertaken. This necessitated the development and validation of a quantitative method for the analysis of EFV in plasma. A simple mobile phase consisting of 0.1 M formic acid, acetonitrile and methanol (43:52:5) was pumped at a low flow rate of 0.3 ml/min through a reverse phase Phenomenex® Luna C18 (2) (5 μm, 150 mm × 2.0 mm i.d.) column maintained at 40 °C. Diclofenac sodium was used as an internal standard (IS) and EFV and IS were monitored at 247 nm and 275 nm, respectively. A simple and rapid sample preparation involved the addition of mobile phase to 100 μl of plasma to precipitate plasma proteins followed by direct injection of 10 μl of supernatant onto the column. The procedures were validated according to international standards with good reproducibility and linear response (r = 0.9990). The intra- and inter-day accuracies were between 12.3 and 17.7% at the LLOQ and between −5.8 and 9.1% for the QC samples. The intra- and inter-day precision of EFV determinations were 5.1 or less and 7.2% RSD or less, respectively across the entire QC concentration range. Mean recovery based on high, medium and low quality control standards ranged between 92.7 and 94.1% with %RSD values better than 3%. Plasma samples were evaluated for short-term (ambient temperature for 6 h) and long-term (−10 ± 2 °C for 60 days) storage conditions and were found to be stable. The method described is cost-effective and has the necessary accuracy and precision for the rapid quantitative determination of EFV in human plasma.
- Full Text:
- Date Issued: 2009
- Authors: Kanfer, Isadore , Mogatle, Seloi
- Date: 2009
- Language: English
- Type: Article
- Identifier: vital:6388 , http://hdl.handle.net/10962/d1006309
- Description: A pharmacokinetic interaction study between efavirenz (EFV), a non-nucleoside reverse transcriptase inhibitor used in the treatment of HIV-1 infection, and an African traditional medicine, African potato in human subjects was undertaken. This necessitated the development and validation of a quantitative method for the analysis of EFV in plasma. A simple mobile phase consisting of 0.1 M formic acid, acetonitrile and methanol (43:52:5) was pumped at a low flow rate of 0.3 ml/min through a reverse phase Phenomenex® Luna C18 (2) (5 μm, 150 mm × 2.0 mm i.d.) column maintained at 40 °C. Diclofenac sodium was used as an internal standard (IS) and EFV and IS were monitored at 247 nm and 275 nm, respectively. A simple and rapid sample preparation involved the addition of mobile phase to 100 μl of plasma to precipitate plasma proteins followed by direct injection of 10 μl of supernatant onto the column. The procedures were validated according to international standards with good reproducibility and linear response (r = 0.9990). The intra- and inter-day accuracies were between 12.3 and 17.7% at the LLOQ and between −5.8 and 9.1% for the QC samples. The intra- and inter-day precision of EFV determinations were 5.1 or less and 7.2% RSD or less, respectively across the entire QC concentration range. Mean recovery based on high, medium and low quality control standards ranged between 92.7 and 94.1% with %RSD values better than 3%. Plasma samples were evaluated for short-term (ambient temperature for 6 h) and long-term (−10 ± 2 °C for 60 days) storage conditions and were found to be stable. The method described is cost-effective and has the necessary accuracy and precision for the rapid quantitative determination of EFV in human plasma.
- Full Text:
- Date Issued: 2009
Efficacy of selected Kenyan medicinal plants used in the treatment and management of Type II Diabetes
- Authors: Karachi, Jacqueline
- Date: 2009
- Subjects: Diabetes -- Alternative treatment -- Kenya , Medicinal plants -- Kenya
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:10327 , http://hdl.handle.net/10948/1049 , Diabetes -- Alternative treatment -- Kenya , Medicinal plants -- Kenya
- Description: In Kenya, the prevalence of diabetes is estimated at 3-10 percent of the population. These figures could be higher because most type 2 diabetics are diagnosed many years after onset. Out of this number, 15 percent are people below 30 years of age who need prompt education to avoid complications that are associated with diabetes (DMI centre, 2004). Due to inadequate or lack of proper information, most patients especially those with type 2 diabetes are diagnosed through complications. Untreated or poorly managed diabetes is now the leading cause of eye disease and kidney failure in the world. Diabetes is the largest cause of kidney failure in the developed world, and is the fourth leading cause of global death by disease in the world (IDF, 2007). At the Kenyatta National Hospital in Nairobi, Kenya, it is the leading cause of all non-accident related amputations. It is with such statistics in mind and the grim reality of poor and inadequate health services that this research is based. The wide use of selected medicinal plants for the treatment and management of diabetes warrants the further study of these plants for potential use and commercialization. The data obtained can also be invaluable for use and reference when using these plants for medicinal purposes. The medicinal plant studied in the research is widely used in Kenya by many communities and was chosen based on ethno-pharmacological references using traditional medicinal practitioners as well as patient’s recommendations. Different in vitro and in vivo assays were studied to try and elucidate the mechanisms of action as well as the organs targeted during treatment using this plant.
- Full Text:
- Date Issued: 2009
- Authors: Karachi, Jacqueline
- Date: 2009
- Subjects: Diabetes -- Alternative treatment -- Kenya , Medicinal plants -- Kenya
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:10327 , http://hdl.handle.net/10948/1049 , Diabetes -- Alternative treatment -- Kenya , Medicinal plants -- Kenya
- Description: In Kenya, the prevalence of diabetes is estimated at 3-10 percent of the population. These figures could be higher because most type 2 diabetics are diagnosed many years after onset. Out of this number, 15 percent are people below 30 years of age who need prompt education to avoid complications that are associated with diabetes (DMI centre, 2004). Due to inadequate or lack of proper information, most patients especially those with type 2 diabetes are diagnosed through complications. Untreated or poorly managed diabetes is now the leading cause of eye disease and kidney failure in the world. Diabetes is the largest cause of kidney failure in the developed world, and is the fourth leading cause of global death by disease in the world (IDF, 2007). At the Kenyatta National Hospital in Nairobi, Kenya, it is the leading cause of all non-accident related amputations. It is with such statistics in mind and the grim reality of poor and inadequate health services that this research is based. The wide use of selected medicinal plants for the treatment and management of diabetes warrants the further study of these plants for potential use and commercialization. The data obtained can also be invaluable for use and reference when using these plants for medicinal purposes. The medicinal plant studied in the research is widely used in Kenya by many communities and was chosen based on ethno-pharmacological references using traditional medicinal practitioners as well as patient’s recommendations. Different in vitro and in vivo assays were studied to try and elucidate the mechanisms of action as well as the organs targeted during treatment using this plant.
- Full Text:
- Date Issued: 2009
An intercultural approach to implementing multilingualism at Rhodes University, South Africa
- Kaschula, Russell H, Maseko, Pamela, Dalvit, Lorenzo, Mapi, Thandeka, Nelani, Linda, Nosilela, Bulelwa, Sam, Msindisi S
- Authors: Kaschula, Russell H , Maseko, Pamela , Dalvit, Lorenzo , Mapi, Thandeka , Nelani, Linda , Nosilela, Bulelwa , Sam, Msindisi S
- Date: 2009
- Subjects: Multilingualism -- South Africa , Intercultural communication , Education, Higher -- South Africa , Language and culture -- South Africa , Language and education -- South Africa , Rhodes University
- Language: English
- Type: article , text
- Identifier: http://hdl.handle.net/10962/59390 , vital:27579 , doi: 10.5842/39-0-74
- Description: The work of intercultural communication theorists such as Ting-Toomey (1999) and Gudykunst (2003) has informed curriculum design and teaching methodology of the courses developed for teaching isiXhosa for vocational purposes to second language (L2) learners. This seems to be an appropriate theoretical paradigm within multilingual South Africa, where intercultural communication is becoming a daily reality for a growing portion of the population. We make use of this theory to introduce and develop experiential understanding of multilingualism at Rhodes University in various departments and, more generally, on campus.
- Full Text:
- Date Issued: 2009
- Authors: Kaschula, Russell H , Maseko, Pamela , Dalvit, Lorenzo , Mapi, Thandeka , Nelani, Linda , Nosilela, Bulelwa , Sam, Msindisi S
- Date: 2009
- Subjects: Multilingualism -- South Africa , Intercultural communication , Education, Higher -- South Africa , Language and culture -- South Africa , Language and education -- South Africa , Rhodes University
- Language: English
- Type: article , text
- Identifier: http://hdl.handle.net/10962/59390 , vital:27579 , doi: 10.5842/39-0-74
- Description: The work of intercultural communication theorists such as Ting-Toomey (1999) and Gudykunst (2003) has informed curriculum design and teaching methodology of the courses developed for teaching isiXhosa for vocational purposes to second language (L2) learners. This seems to be an appropriate theoretical paradigm within multilingual South Africa, where intercultural communication is becoming a daily reality for a growing portion of the population. We make use of this theory to introduce and develop experiential understanding of multilingualism at Rhodes University in various departments and, more generally, on campus.
- Full Text:
- Date Issued: 2009
The influence of cellular phone "speak" on isiXhosa rules of communication
- Kaschula, Russell H, Mostert, André
- Authors: Kaschula, Russell H , Mostert, André
- Date: 2009
- Subjects: Cell phones -- South Africa , Communication and culture -- Technological innovations , Language and culture -- South Africa , Xhosa (African people) -- Social life and customs
- Language: English
- Type: article , text
- Identifier: http://hdl.handle.net/10962/59401 , vital:27594 , doi: 10.5842/37-0-43
- Description: Cellular telephones have revolutionised the art of communication across all societies, and South Africa is no exception. Access to this form of communication has made personal contact easier, in both rural and urban contexts. Globally this form of communication has been readily embraced. However, cultural rules that pertain to face-to-face communication are often flouted by cellular phone users. This flouting holds true no doubt across many cultures, languages and contexts. Bloomer (2005:97-100) assesses this flouting of cultural maxims in relation to Grice's cooperative principle. This article attempts to assess how general rules of politeness in isiXhosa have been and are being transformed by what could be termed the "economics of speaking".
- Full Text:
- Date Issued: 2009
- Authors: Kaschula, Russell H , Mostert, André
- Date: 2009
- Subjects: Cell phones -- South Africa , Communication and culture -- Technological innovations , Language and culture -- South Africa , Xhosa (African people) -- Social life and customs
- Language: English
- Type: article , text
- Identifier: http://hdl.handle.net/10962/59401 , vital:27594 , doi: 10.5842/37-0-43
- Description: Cellular telephones have revolutionised the art of communication across all societies, and South Africa is no exception. Access to this form of communication has made personal contact easier, in both rural and urban contexts. Globally this form of communication has been readily embraced. However, cultural rules that pertain to face-to-face communication are often flouted by cellular phone users. This flouting holds true no doubt across many cultures, languages and contexts. Bloomer (2005:97-100) assesses this flouting of cultural maxims in relation to Grice's cooperative principle. This article attempts to assess how general rules of politeness in isiXhosa have been and are being transformed by what could be termed the "economics of speaking".
- Full Text:
- Date Issued: 2009
Analyzing, digitizing and technologizing the oral word: the case of Bongani Sitole
- Kaschula, Russell H, Mostert, André
- Authors: Kaschula, Russell H , Mostert, André
- Date: 2009
- Subjects: Sitole, Bongani, 1937- , Xhosa (African people) -- South Africa , Xhosa poetry , Folk poetry, Xhosa
- Language: English
- Type: article , text
- Identifier: http://hdl.handle.net/10962/59368 , vital:27566 , https://doi.org/10.1080/13696810903259384
- Description: This article analyzes the oral poetry, izibongo, produced by Xhosa oral poet Bongani Sitole (both in book and technological form). It will trace this poetry from the moment it was orally produced, through to the technologizing and publication of this poetry in book form and on a website. The initial part of this article looks at the life and work of the poet. A contextual analysis of selected poetry is provided. The latter part of the article concentrates on issues related to technology and its relationship to the oral and written word. The term ‘technauriture’ has been coined in order to refer to this process. The contribution of eLearning4Africa (www.elearning4africa.com) to the digitization process of Sitole’s poetry is acknowledged.
- Full Text:
- Date Issued: 2009
- Authors: Kaschula, Russell H , Mostert, André
- Date: 2009
- Subjects: Sitole, Bongani, 1937- , Xhosa (African people) -- South Africa , Xhosa poetry , Folk poetry, Xhosa
- Language: English
- Type: article , text
- Identifier: http://hdl.handle.net/10962/59368 , vital:27566 , https://doi.org/10.1080/13696810903259384
- Description: This article analyzes the oral poetry, izibongo, produced by Xhosa oral poet Bongani Sitole (both in book and technological form). It will trace this poetry from the moment it was orally produced, through to the technologizing and publication of this poetry in book form and on a website. The initial part of this article looks at the life and work of the poet. A contextual analysis of selected poetry is provided. The latter part of the article concentrates on issues related to technology and its relationship to the oral and written word. The term ‘technauriture’ has been coined in order to refer to this process. The contribution of eLearning4Africa (www.elearning4africa.com) to the digitization process of Sitole’s poetry is acknowledged.
- Full Text:
- Date Issued: 2009
The impact of HIV and AIDS on household food security and food acquisition strategies in South Africa
- Authors: Kaschula, S A H
- Date: 2009
- Subjects: Food security -- South Africa Food supply -- South Africa AIDS (Disease) -- Social aspects -- South Africa HIV infections -- Social aspects -- South Africa Chronically ill -- Economic conditions -- South Africa Chronically ill -- Social conditions -- South Africa Food -- Social aspects -- South Africa Food -- Economic aspects -- South Africa Rural development -- South Africa
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:4754 , http://hdl.handle.net/10962/d1007137
- Description: How should the impact of HIV and AIDS on rural livelihoods be factored into efforts to monitor and stabilise household food security? With both HIV and AIDS and food security at the top of the global development agenda, this is a question posed by many scholars, practitioners, donor agencies and government departments. However, while there is an excess of discourse outlining the theoretical bases for how HIV and AIDS can, and is, radically transforming household food acquisition; there is a lack of empirical evidence from the South African context that demonstrates if, and how, HIV and AIDS changes household-level strategies of food acquisition and intake. This thesis explores the association of household-level mortality, chronic illness and additional child-dependent fostering with household experience of food security and food acquisition strategies, in three rural villages in the Eastern Cape and KwaZulu-Natal Provinces of South Africa. Qualitative and quantitative methods of data-collection were applied to 307 households in the three sites. For twelve months, both HIV and AIDS-afflicted and non-afflicted households were repeatedly visited at 3-month intervals, in order to be assessed for levels of food security, dietary intake and method of food procurement (purchased, cultivated, wild or donated). Overall, HIV and AIDS-afflicted households showed a significantly higher experience of food insecurity, probably attributable to shortages in food quantity. Dietary composition and overall diversity, however, was not significantly different. Although households with chronic illness and recent mortality showed a heightened investment in cultivation sources, the success of these strategies were to a great extent mediated by household income, and the level of medical treatment received by those who were chronically ill. Chronic illness was also associated with more donations, but these required considerable investments in social capital networks. Finally, use of wild leafy vegetables was not associated with household HIV and AIDS status, despite the financial, nutritional and labour-saving properties of these foods. Overall, the study suggests that there was little evidence of long-term planning and strategy in household food security responses. There was no evidence for shifts to labour-saving crops or foods and, in some instances, child labour was being used to ameliorate prime-adult labour deficits. Moreover, given that the vast majority (89.2%) of food groups were sourced through purchase, it is questionable whether investing in diverse food acquisition strategies would be advisable. Unless supported by medical treatment and steady earned household income, policies to promote intensified household agricultural subsistence production in the wake of HIV and AIDS are unlikely to provide households with anything more than short-term safety-nets, rather than long-term, sustainable food security solutions.
- Full Text:
- Date Issued: 2009
- Authors: Kaschula, S A H
- Date: 2009
- Subjects: Food security -- South Africa Food supply -- South Africa AIDS (Disease) -- Social aspects -- South Africa HIV infections -- Social aspects -- South Africa Chronically ill -- Economic conditions -- South Africa Chronically ill -- Social conditions -- South Africa Food -- Social aspects -- South Africa Food -- Economic aspects -- South Africa Rural development -- South Africa
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:4754 , http://hdl.handle.net/10962/d1007137
- Description: How should the impact of HIV and AIDS on rural livelihoods be factored into efforts to monitor and stabilise household food security? With both HIV and AIDS and food security at the top of the global development agenda, this is a question posed by many scholars, practitioners, donor agencies and government departments. However, while there is an excess of discourse outlining the theoretical bases for how HIV and AIDS can, and is, radically transforming household food acquisition; there is a lack of empirical evidence from the South African context that demonstrates if, and how, HIV and AIDS changes household-level strategies of food acquisition and intake. This thesis explores the association of household-level mortality, chronic illness and additional child-dependent fostering with household experience of food security and food acquisition strategies, in three rural villages in the Eastern Cape and KwaZulu-Natal Provinces of South Africa. Qualitative and quantitative methods of data-collection were applied to 307 households in the three sites. For twelve months, both HIV and AIDS-afflicted and non-afflicted households were repeatedly visited at 3-month intervals, in order to be assessed for levels of food security, dietary intake and method of food procurement (purchased, cultivated, wild or donated). Overall, HIV and AIDS-afflicted households showed a significantly higher experience of food insecurity, probably attributable to shortages in food quantity. Dietary composition and overall diversity, however, was not significantly different. Although households with chronic illness and recent mortality showed a heightened investment in cultivation sources, the success of these strategies were to a great extent mediated by household income, and the level of medical treatment received by those who were chronically ill. Chronic illness was also associated with more donations, but these required considerable investments in social capital networks. Finally, use of wild leafy vegetables was not associated with household HIV and AIDS status, despite the financial, nutritional and labour-saving properties of these foods. Overall, the study suggests that there was little evidence of long-term planning and strategy in household food security responses. There was no evidence for shifts to labour-saving crops or foods and, in some instances, child labour was being used to ameliorate prime-adult labour deficits. Moreover, given that the vast majority (89.2%) of food groups were sourced through purchase, it is questionable whether investing in diverse food acquisition strategies would be advisable. Unless supported by medical treatment and steady earned household income, policies to promote intensified household agricultural subsistence production in the wake of HIV and AIDS are unlikely to provide households with anything more than short-term safety-nets, rather than long-term, sustainable food security solutions.
- Full Text:
- Date Issued: 2009
Quantity and significance of wild meat off-take by a rural community in the Eastern Cape, South Africa
- Kaschula, Sarah A H, Shackleton, Charlie M
- Authors: Kaschula, Sarah A H , Shackleton, Charlie M
- Date: 2009
- Language: English
- Type: Article
- Identifier: vital:6638 , http://hdl.handle.net/10962/d1006864
- Description: When compared to tropical forest zones in west and central Africa, off-take of wild meat from savannah and grassland biomes by local rural communities has not been well assessed. This case study of wild meat collection activities within a rural community in the Mount Frere region of the Eastern Cape (South Africa) uses last-catch records derived from 50 wild meat gatherers to calculate average off-take of taxa, species and fresh mass of wild meat per collection event. When per-event off take is overlaid onto household hunting frequency data, annual off-take would be 268.6 kg km−2 yr−1 or 3 kg person−1 yr−1 presuming constant off-take over an annual period. Monetary value of off-take would be South African R 307 (US$ 39) per household annually. For some species, off-take weight per km2 shows similar values to data from tropical forest zones, but high human population densities tend to dilute off-takes to less nutritionally significant amounts at the per person scale. However, unlike many tropical zones, none of the species harvested can be considered high-priority conservation species. Even densely populated and heavily harvested communal lands appear to offer high wild meat off-takes from low conservation priority species.
- Full Text:
- Date Issued: 2009
- Authors: Kaschula, Sarah A H , Shackleton, Charlie M
- Date: 2009
- Language: English
- Type: Article
- Identifier: vital:6638 , http://hdl.handle.net/10962/d1006864
- Description: When compared to tropical forest zones in west and central Africa, off-take of wild meat from savannah and grassland biomes by local rural communities has not been well assessed. This case study of wild meat collection activities within a rural community in the Mount Frere region of the Eastern Cape (South Africa) uses last-catch records derived from 50 wild meat gatherers to calculate average off-take of taxa, species and fresh mass of wild meat per collection event. When per-event off take is overlaid onto household hunting frequency data, annual off-take would be 268.6 kg km−2 yr−1 or 3 kg person−1 yr−1 presuming constant off-take over an annual period. Monetary value of off-take would be South African R 307 (US$ 39) per household annually. For some species, off-take weight per km2 shows similar values to data from tropical forest zones, but high human population densities tend to dilute off-takes to less nutritionally significant amounts at the per person scale. However, unlike many tropical zones, none of the species harvested can be considered high-priority conservation species. Even densely populated and heavily harvested communal lands appear to offer high wild meat off-takes from low conservation priority species.
- Full Text:
- Date Issued: 2009
Lithostratigraphy sedimentology and provenance of the Balfour Formation Beaufort Group in the Fort Beaufort Alice area Eastern Cape Province South Africa
- Authors: Katemaunzanga, David
- Date: 2009
- Subjects: Sedimentary structures -- South Africa -- Eastern Cape , Formations (Geology) -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MSc (Geology)
- Identifier: vital:11521 , http://hdl.handle.net/10353/274 , Sedimentary structures -- South Africa -- Eastern Cape , Formations (Geology) -- South Africa -- Eastern Cape
- Description: A traverse through the Balfour Formation was chosen in the area around the towns of Fort Beaufort and Alice in the Eastern Cape Province. The main objectives of the study were to map the lithological variations within the Balfour Formation and to distinguish it from the underlying Middleton Formation and the overlying Katberg Formation. A combined desktop, field and laboratory approach was used in this study. Aerial photographs, satellite images and digital topographical maps formed the basis of the desktop work. After desktop mapping, a number of field traverses were measured through the study area. Sedimentary structures were observed, photomosaics were done, stratigraphic sections were measured and samples were collected for thin sectioning, heavy mineral separation and major, trace and REE analysis. Sedimentological development of the Balfour Formation has been outlined in relation to its provenance during the Late Permian. Lithological variation of the Balfour Formation is characterised by alternating sandstone-dominated and mudstone-dominated members. Arenaceous Oudeberg and Barberskrans Members are contain facies ranging from intraformational conglomerates (Gmm), massive sandstones (Sm & Ss), horizontally laminated sandstones (Sh), planar and trough cross-bedded sandstones (Sp, Sl & St), trough cross-laminated sandstones (Sr) and fine-grained sediments (Fm & Fl), whereas the mudstone dominated members are characterised by the facies Fm and Fl. Lithofacies together with bedforms observed in the Balfour Formation were used in architecturalelement analysis. Sandstone–rich members are dominated by channel fill elements such as LS, DA, SB, LA and CH, whereas the fine-grained component consists of mainly, FF iii element. The mudstone-dominated members contain FF, CS and LV elements, with LA, SB and CH in the subordinate sandstones. Petrography, geochemistry and palaeocurrent analysis indicated that the source of the Balfour Formation was to the south-east and the rocks had a transitional/dissected magmatic arc signature. This led to the postulation of the Karoo Basin to have developed in a retro-arc foreland basin where there was supralithospheric loading in the Cape Fold Belt due to a compressional regime initiated by the subduction of Palaeo-Pacific plate underneath the Gondwana plate. The tectonic loading was episodic with eight major paroxysms affecting the Karoo Supergroup. The Balfour Formation coincides with the fourth paroxysm, this paroxysm in turn consists of two third-order paroxysm that initiated the deposition of the Oudeberg and Barberskrans Members in low sinuosity streams. Each paroxysm was followed by a period of quiescence and these resulted in the deposition of the Daggaboersnek, Elandsberg and Palingkloof Members in meandering streams. Depositional environments were determined mainly from the sedimentary structures and 3D architecture of the rock types. Sandstone rich members were formed by seasonal and ephemeral high energy low sinuous streams whereas the fine-grained rich members were formed by ephemeral meandering streams. Palaeoclimates have been equated to the present temperate climates; they were semi-arid becoming arid towards the top of the Balfour Formation. This has been determined geochemistry (CIA), sedimentary structures and other rock properties like colour.
- Full Text:
- Date Issued: 2009
- Authors: Katemaunzanga, David
- Date: 2009
- Subjects: Sedimentary structures -- South Africa -- Eastern Cape , Formations (Geology) -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MSc (Geology)
- Identifier: vital:11521 , http://hdl.handle.net/10353/274 , Sedimentary structures -- South Africa -- Eastern Cape , Formations (Geology) -- South Africa -- Eastern Cape
- Description: A traverse through the Balfour Formation was chosen in the area around the towns of Fort Beaufort and Alice in the Eastern Cape Province. The main objectives of the study were to map the lithological variations within the Balfour Formation and to distinguish it from the underlying Middleton Formation and the overlying Katberg Formation. A combined desktop, field and laboratory approach was used in this study. Aerial photographs, satellite images and digital topographical maps formed the basis of the desktop work. After desktop mapping, a number of field traverses were measured through the study area. Sedimentary structures were observed, photomosaics were done, stratigraphic sections were measured and samples were collected for thin sectioning, heavy mineral separation and major, trace and REE analysis. Sedimentological development of the Balfour Formation has been outlined in relation to its provenance during the Late Permian. Lithological variation of the Balfour Formation is characterised by alternating sandstone-dominated and mudstone-dominated members. Arenaceous Oudeberg and Barberskrans Members are contain facies ranging from intraformational conglomerates (Gmm), massive sandstones (Sm & Ss), horizontally laminated sandstones (Sh), planar and trough cross-bedded sandstones (Sp, Sl & St), trough cross-laminated sandstones (Sr) and fine-grained sediments (Fm & Fl), whereas the mudstone dominated members are characterised by the facies Fm and Fl. Lithofacies together with bedforms observed in the Balfour Formation were used in architecturalelement analysis. Sandstone–rich members are dominated by channel fill elements such as LS, DA, SB, LA and CH, whereas the fine-grained component consists of mainly, FF iii element. The mudstone-dominated members contain FF, CS and LV elements, with LA, SB and CH in the subordinate sandstones. Petrography, geochemistry and palaeocurrent analysis indicated that the source of the Balfour Formation was to the south-east and the rocks had a transitional/dissected magmatic arc signature. This led to the postulation of the Karoo Basin to have developed in a retro-arc foreland basin where there was supralithospheric loading in the Cape Fold Belt due to a compressional regime initiated by the subduction of Palaeo-Pacific plate underneath the Gondwana plate. The tectonic loading was episodic with eight major paroxysms affecting the Karoo Supergroup. The Balfour Formation coincides with the fourth paroxysm, this paroxysm in turn consists of two third-order paroxysm that initiated the deposition of the Oudeberg and Barberskrans Members in low sinuosity streams. Each paroxysm was followed by a period of quiescence and these resulted in the deposition of the Daggaboersnek, Elandsberg and Palingkloof Members in meandering streams. Depositional environments were determined mainly from the sedimentary structures and 3D architecture of the rock types. Sandstone rich members were formed by seasonal and ephemeral high energy low sinuous streams whereas the fine-grained rich members were formed by ephemeral meandering streams. Palaeoclimates have been equated to the present temperate climates; they were semi-arid becoming arid towards the top of the Balfour Formation. This has been determined geochemistry (CIA), sedimentary structures and other rock properties like colour.
- Full Text:
- Date Issued: 2009
An investigation of changing socio-economic conditions, opportunities and development interventions in small Eastern Cape towns in South Africa
- Authors: Keal, Duncan
- Date: 2009
- Subjects: Local Economic Development (Programme) Economic development -- South Africa -- Eastern Cape -- Case studies Sustainable development -- South Africa -- Eastern Cape -- Case studies Community development -- South Africa -- Eastern Cape -- Case studies Cities and towns -- South Africa -- Eastern Cape -- Growth South Africa -- Economic conditions
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:4840 , http://hdl.handle.net/10962/d1005516
- Description: Small towns internationally and in South Africa are becoming increasingly marginalised, and they are often experiencing economic downturn, demographic shifts and a rearticulation of their role in the urban hierarchy. In the case of South Africa many of these small towns are also faced with low levels of social development. The urgent need to address such conditions is evident by the fact that a large proportion of the South African population resides in small towns, and their surrounding hinterlands. This said, there are examples of small towns, internationally and in South Africa which, through the use of various Local Economic Development actions, have managed to remain sustainable, and in some cases become economically viable localities once again. In light of the above, the research conducted for this thesis seeks first to establish the socio-economic changes occurring over time in three small towns in the Eastern Cape Province of South Africa, namely Stutterheim, Bedford and Hamburg. Secondly, the research aims to identify the nature of LED activities in the three small towns, highlighting those factors contributing to the success of LED initiatives as well as those factors inhibiting LED in small towns. This is done with the intention of developing future lessons for LED in small towns. The research was conducted using a mix of qualitative and quantitative data generated through the interviews with key role players in each town, as well as secondary data sources. Findings from the research suggest that the small towns investigated are characterised by low levels of socio-economic development. In addition, it appears that the development opportunities for the towns are limited. Current initiatives are being driven by private role players with local government being largely uninvolved. Such initiatives are limited in nature, with benefits only felt by small groups of the local community. However, examples do exist of where LED has successfully benefited the broader spheres of the local community, thus suggesting that if implemented properly such an approach does have potential to assist in the socio-economic development of small towns. In light of this, a number of lessons are identified for LED in small towns, including the need for strong leadership, community involvement, partnerships between role players, and planning for project sustainability.
- Full Text:
- Date Issued: 2009
- Authors: Keal, Duncan
- Date: 2009
- Subjects: Local Economic Development (Programme) Economic development -- South Africa -- Eastern Cape -- Case studies Sustainable development -- South Africa -- Eastern Cape -- Case studies Community development -- South Africa -- Eastern Cape -- Case studies Cities and towns -- South Africa -- Eastern Cape -- Growth South Africa -- Economic conditions
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:4840 , http://hdl.handle.net/10962/d1005516
- Description: Small towns internationally and in South Africa are becoming increasingly marginalised, and they are often experiencing economic downturn, demographic shifts and a rearticulation of their role in the urban hierarchy. In the case of South Africa many of these small towns are also faced with low levels of social development. The urgent need to address such conditions is evident by the fact that a large proportion of the South African population resides in small towns, and their surrounding hinterlands. This said, there are examples of small towns, internationally and in South Africa which, through the use of various Local Economic Development actions, have managed to remain sustainable, and in some cases become economically viable localities once again. In light of the above, the research conducted for this thesis seeks first to establish the socio-economic changes occurring over time in three small towns in the Eastern Cape Province of South Africa, namely Stutterheim, Bedford and Hamburg. Secondly, the research aims to identify the nature of LED activities in the three small towns, highlighting those factors contributing to the success of LED initiatives as well as those factors inhibiting LED in small towns. This is done with the intention of developing future lessons for LED in small towns. The research was conducted using a mix of qualitative and quantitative data generated through the interviews with key role players in each town, as well as secondary data sources. Findings from the research suggest that the small towns investigated are characterised by low levels of socio-economic development. In addition, it appears that the development opportunities for the towns are limited. Current initiatives are being driven by private role players with local government being largely uninvolved. Such initiatives are limited in nature, with benefits only felt by small groups of the local community. However, examples do exist of where LED has successfully benefited the broader spheres of the local community, thus suggesting that if implemented properly such an approach does have potential to assist in the socio-economic development of small towns. In light of this, a number of lessons are identified for LED in small towns, including the need for strong leadership, community involvement, partnerships between role players, and planning for project sustainability.
- Full Text:
- Date Issued: 2009
Between a rock and a hard place:
- Authors: Keeton, Gavin
- Date: 2009
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/159401 , vital:40294 , https://hdl.handle.net/10520/EJC139947
- Description: Gavin Keeton takes an economist's tour of the current crisis : how did it happen and what does it mean?
- Full Text:
- Date Issued: 2009
- Authors: Keeton, Gavin
- Date: 2009
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/159401 , vital:40294 , https://hdl.handle.net/10520/EJC139947
- Description: Gavin Keeton takes an economist's tour of the current crisis : how did it happen and what does it mean?
- Full Text:
- Date Issued: 2009
Determinism and reactive attitudes: reflections on our alleged unrenounceable commitments
- Authors: Kelland, Lindsay-Ann
- Date: 2009
- Subjects: Free will and determinism Responsibility
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2713 , http://hdl.handle.net/10962/d1002843
- Description: There seems to exist a tension between our metaphysical and phenomenological commitments in the free will debate. On the one hand, I argue that at the metaphysical level we cannot coherently defend the belief that we are morally responsible in the sense that we deserve to be rewarded and punished for our actions, where desert-entailing moral responsibility is the primary understanding of moral responsibility presupposed in the free will debate. I argue that we are responsible for our actions but only in the weaker sense, termed ‘attributability’ by Gary Watson. On the other hand, we are allegedly unrenounceably committed at the phenomenological level to conceiving of, and treating, ourselves and one another as morally responsible beings in the desert-entailing sense. P. F. Strawson famously defends this claim in his seminal work, ‘Freedom and Resentment’. In my thesis I will set out this tension by exploring both commitments in turn. I then aim to show that the tension can be dissolved by arguing, contra P. F. Strawson, that our phenomenological commitment is not in fact unrenounceable. The dissolution of this tension entails, I argue, that we must examine our conception of self and other. We must explore the implications of adopting a position which denies that we are morally responsible beings for our life-hopes, personal feelings, inter-personal relationships and projects. Most importantly, I argue that we must renounce our current retributive condemnatory practices which are based on the unjustified belief that we are morally responsible beings.
- Full Text:
- Date Issued: 2009
- Authors: Kelland, Lindsay-Ann
- Date: 2009
- Subjects: Free will and determinism Responsibility
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2713 , http://hdl.handle.net/10962/d1002843
- Description: There seems to exist a tension between our metaphysical and phenomenological commitments in the free will debate. On the one hand, I argue that at the metaphysical level we cannot coherently defend the belief that we are morally responsible in the sense that we deserve to be rewarded and punished for our actions, where desert-entailing moral responsibility is the primary understanding of moral responsibility presupposed in the free will debate. I argue that we are responsible for our actions but only in the weaker sense, termed ‘attributability’ by Gary Watson. On the other hand, we are allegedly unrenounceably committed at the phenomenological level to conceiving of, and treating, ourselves and one another as morally responsible beings in the desert-entailing sense. P. F. Strawson famously defends this claim in his seminal work, ‘Freedom and Resentment’. In my thesis I will set out this tension by exploring both commitments in turn. I then aim to show that the tension can be dissolved by arguing, contra P. F. Strawson, that our phenomenological commitment is not in fact unrenounceable. The dissolution of this tension entails, I argue, that we must examine our conception of self and other. We must explore the implications of adopting a position which denies that we are morally responsible beings for our life-hopes, personal feelings, inter-personal relationships and projects. Most importantly, I argue that we must renounce our current retributive condemnatory practices which are based on the unjustified belief that we are morally responsible beings.
- Full Text:
- Date Issued: 2009
Mariculture as a means to add value to the east coast rock lobster Panulirus homarus rubellus subsistence fishery : a physiological approach to define transport and growout protocols for wild caught juveniles
- Authors: Kemp, J O G
- Date: 2009
- Subjects: Lobster fisheries -- South Africa , Lobster culture -- South Africa , Lobsters -- Growth -- South Africa , Mariculture -- South Africa
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5299 , http://hdl.handle.net/10962/d1005144
- Description: In a context of declining capture fisheries and public pressure for greater access to marine resources, marine aquaculture is receiving increasing interest from the South African government as a means to increase the diversity of economic activities in coastal regions, thereby providing employment and reducing poverty. The east coast rock lobster Panulirus homarus rubellus is currently harvested by subsistence fisherman along the former Transkei coastline of south-east South Africa and presents a possible opportunity for ongrowing wild juvenile lobsters in culture facilities. Lack of compliance coupled with poor enforcement of the minimum size limit (65 mm carapace length) has resulted in the ongoing harvest of undersize size lobsters by subsistence fishers. Generally, fishers either consume these undersize lobsters or sell them to tourists for low prices. In line with international trends in rock lobster aquaculture, interest has subsequently arisen in the possibilities of ongrowing these undersize lobsters as a means of adding value to the P. h rubellus resource for subsistence fishers. The aim of this physiological study was to assess the biological feasibility of harvesting, transporting and culturing wild caught juvenile lobsters, thereby provide empirical data to inform the development of suitable transport and culture protocols. The experimental objectives were to asses the effect of temperature on growth and survival of P. h. rubellus, as well as the effects of a suite of extrinsic and intrinsic factors on ammonia excretion and oxygen consumption. Juvenile lobsters were collected by hand from near-shore reefs (2-15 m depth) off Mdumbi in the former Transkei, Eastern Cape Province and transported by road (7 hours) to the Port Alfred Marine Research Laboratory where they were held in a recirculating culture system. The effect of temperature over a range of 9.7 °C (18.9±0.7 to 28.6±1.5 °C) on the growth and survival of juvenile P. h. rubellus fed a diet of fresh mussel flesh was investigated. Specific growth rate (SGR) was significantly different between temperatures (p = 0.01), with the highest values recorded for the 24 °C and 28 °C treatments. There was no significant difference in moult increment (MI) between temperatures, however, intermoult period (IMP) differed significantly between temperatures (p = 0.0015) with mean IMP lowest at 24 °C, although not significantly different from the means of the 26 °C and 28 °C treatments. IMP was highest at 19 °C and 21 °C. Apparent feed intake was significantly different between treatments (p < 0.0001) and exhibited a strong positive correlation with increasing temperature. Food conversion ratio (FCR) differed significantly between temperatures (p = 0.02) with 24 °C exhibiting the most efficient FCR. The results for growth rate and food conversion efficiency suggested that 24 °C is optimal for the growout of juvenile P. h. rubellus. In the second study, the effect of body weight, emersion, daily rhythm, feeding and ambient ammonia on the total ammonia nitrogen (TAN) excretion rate was investigated. Body weight (n = 16, range of 16.8 – 322 g) was positively correlated to daytime TAN excretion rate (mg h⁻¹). Re-immersion after one hour emersion in a moist environment was characterized by a significant increase in TAN excretion rate for the first hour compared to pre-immersion levels. The amount of TAN excreted during this period was as expected if basal TAN excretion rates were maintained during emersion. TAN excretion rates returned to pre-emersion levels by the end of the second hour. There was no evidence of a daily rhythm in TAN excretion rate for P. h. rubellus. TAN excretion rates were elevated following feeding. An initial peak in TAN excretion rate after seven hours (7.58 times pre-feeding rate) was followed by a smaller peak after 13 hours (6.69 times pre-feeding rate). TAN excretion rate dropped to levels not significantly different from pre-feeding levels after 23 hours and consistently returned to pre-feeding levels after 42 hours. The TAN excretion rates of lobster exposed for two hours to an ambient TAN concentration of 1.02±0.10 mg l⁻¹ and 2.3± 0.2 mg l⁻¹ were not significantly different from TAN excretion rates recorded at low ambient water TAN prior to exposure. Exposure to an ambient TAN concentration of 4.45±0.78 mg l⁻¹ had a significant effect on the TAN excretion rate, with pronounced ammonia uptake occurring for all animals at this concentration. The third study investigated the effects of body weight, diurnal rhythm, feeding and emersion on lobster oxygen consumption. Body weight was positively correlated to both standard and active oxygen consumption (mg O2 h⁻¹) while body weight was negatively correlated to mass-specific standard oxygen uptake (mg O2 g⁻¹ h⁻¹). Diurnal rhythm exhibited a strong effect on the lobsters oxygen consumption, with average night time values 67% greater than those recorded during the day. This was related to activity driven by intrinsic nocturnal foraging behaviour. Feeding resulted in a classic specific dynamic action (SDA) response, with postprandial oxygen consumption increasing to a peak before decreasing gradually to preprandial levels. Emersion resulted in a significant increase in oxygen consumption, with lobsters rapidly recovering to pre-emersion levels after four hours. Results from these studies suggest that the capture, transport and culture of juvenile P. h. rubellus is biologically feasible. Empirical data generated were used to provide recommendations regarding species optimised transport and culture protocols. A purge time of 48 hours before transport is suggested to ensure that ammonia excretion and oxygen consumption are at basal levels. Furthermore, emersed transport for a period of one hour is characterised by rapid recovery upon re-immersion. In order to prevent the accumulation of stressors, it is suggested that consecutive periods of emersion are interjected with recovery periods (five hours) in water to allow the removal of accumulated ammonia and repayment of the oxygen debt incurred. The recorded ammonia rates indicate that a biological filter size of 4.8 m³ is recommended for 1000 kg of fed lobsters in a culture situation, although this can be reduced considerably if lobsters are being held without feeding (0.72 m³). A flow rate of 112 l kg⁻¹ h⁻¹ is required to meet the metabolic requirements of lobsters. Bottlenecks to the viable commercial culture of P. h. rubellus, and the ability of this practice to provide the socio-economic benefits that were envisioned, are discussed.
- Full Text:
- Date Issued: 2009
- Authors: Kemp, J O G
- Date: 2009
- Subjects: Lobster fisheries -- South Africa , Lobster culture -- South Africa , Lobsters -- Growth -- South Africa , Mariculture -- South Africa
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5299 , http://hdl.handle.net/10962/d1005144
- Description: In a context of declining capture fisheries and public pressure for greater access to marine resources, marine aquaculture is receiving increasing interest from the South African government as a means to increase the diversity of economic activities in coastal regions, thereby providing employment and reducing poverty. The east coast rock lobster Panulirus homarus rubellus is currently harvested by subsistence fisherman along the former Transkei coastline of south-east South Africa and presents a possible opportunity for ongrowing wild juvenile lobsters in culture facilities. Lack of compliance coupled with poor enforcement of the minimum size limit (65 mm carapace length) has resulted in the ongoing harvest of undersize size lobsters by subsistence fishers. Generally, fishers either consume these undersize lobsters or sell them to tourists for low prices. In line with international trends in rock lobster aquaculture, interest has subsequently arisen in the possibilities of ongrowing these undersize lobsters as a means of adding value to the P. h rubellus resource for subsistence fishers. The aim of this physiological study was to assess the biological feasibility of harvesting, transporting and culturing wild caught juvenile lobsters, thereby provide empirical data to inform the development of suitable transport and culture protocols. The experimental objectives were to asses the effect of temperature on growth and survival of P. h. rubellus, as well as the effects of a suite of extrinsic and intrinsic factors on ammonia excretion and oxygen consumption. Juvenile lobsters were collected by hand from near-shore reefs (2-15 m depth) off Mdumbi in the former Transkei, Eastern Cape Province and transported by road (7 hours) to the Port Alfred Marine Research Laboratory where they were held in a recirculating culture system. The effect of temperature over a range of 9.7 °C (18.9±0.7 to 28.6±1.5 °C) on the growth and survival of juvenile P. h. rubellus fed a diet of fresh mussel flesh was investigated. Specific growth rate (SGR) was significantly different between temperatures (p = 0.01), with the highest values recorded for the 24 °C and 28 °C treatments. There was no significant difference in moult increment (MI) between temperatures, however, intermoult period (IMP) differed significantly between temperatures (p = 0.0015) with mean IMP lowest at 24 °C, although not significantly different from the means of the 26 °C and 28 °C treatments. IMP was highest at 19 °C and 21 °C. Apparent feed intake was significantly different between treatments (p < 0.0001) and exhibited a strong positive correlation with increasing temperature. Food conversion ratio (FCR) differed significantly between temperatures (p = 0.02) with 24 °C exhibiting the most efficient FCR. The results for growth rate and food conversion efficiency suggested that 24 °C is optimal for the growout of juvenile P. h. rubellus. In the second study, the effect of body weight, emersion, daily rhythm, feeding and ambient ammonia on the total ammonia nitrogen (TAN) excretion rate was investigated. Body weight (n = 16, range of 16.8 – 322 g) was positively correlated to daytime TAN excretion rate (mg h⁻¹). Re-immersion after one hour emersion in a moist environment was characterized by a significant increase in TAN excretion rate for the first hour compared to pre-immersion levels. The amount of TAN excreted during this period was as expected if basal TAN excretion rates were maintained during emersion. TAN excretion rates returned to pre-emersion levels by the end of the second hour. There was no evidence of a daily rhythm in TAN excretion rate for P. h. rubellus. TAN excretion rates were elevated following feeding. An initial peak in TAN excretion rate after seven hours (7.58 times pre-feeding rate) was followed by a smaller peak after 13 hours (6.69 times pre-feeding rate). TAN excretion rate dropped to levels not significantly different from pre-feeding levels after 23 hours and consistently returned to pre-feeding levels after 42 hours. The TAN excretion rates of lobster exposed for two hours to an ambient TAN concentration of 1.02±0.10 mg l⁻¹ and 2.3± 0.2 mg l⁻¹ were not significantly different from TAN excretion rates recorded at low ambient water TAN prior to exposure. Exposure to an ambient TAN concentration of 4.45±0.78 mg l⁻¹ had a significant effect on the TAN excretion rate, with pronounced ammonia uptake occurring for all animals at this concentration. The third study investigated the effects of body weight, diurnal rhythm, feeding and emersion on lobster oxygen consumption. Body weight was positively correlated to both standard and active oxygen consumption (mg O2 h⁻¹) while body weight was negatively correlated to mass-specific standard oxygen uptake (mg O2 g⁻¹ h⁻¹). Diurnal rhythm exhibited a strong effect on the lobsters oxygen consumption, with average night time values 67% greater than those recorded during the day. This was related to activity driven by intrinsic nocturnal foraging behaviour. Feeding resulted in a classic specific dynamic action (SDA) response, with postprandial oxygen consumption increasing to a peak before decreasing gradually to preprandial levels. Emersion resulted in a significant increase in oxygen consumption, with lobsters rapidly recovering to pre-emersion levels after four hours. Results from these studies suggest that the capture, transport and culture of juvenile P. h. rubellus is biologically feasible. Empirical data generated were used to provide recommendations regarding species optimised transport and culture protocols. A purge time of 48 hours before transport is suggested to ensure that ammonia excretion and oxygen consumption are at basal levels. Furthermore, emersed transport for a period of one hour is characterised by rapid recovery upon re-immersion. In order to prevent the accumulation of stressors, it is suggested that consecutive periods of emersion are interjected with recovery periods (five hours) in water to allow the removal of accumulated ammonia and repayment of the oxygen debt incurred. The recorded ammonia rates indicate that a biological filter size of 4.8 m³ is recommended for 1000 kg of fed lobsters in a culture situation, although this can be reduced considerably if lobsters are being held without feeding (0.72 m³). A flow rate of 112 l kg⁻¹ h⁻¹ is required to meet the metabolic requirements of lobsters. Bottlenecks to the viable commercial culture of P. h. rubellus, and the ability of this practice to provide the socio-economic benefits that were envisioned, are discussed.
- Full Text:
- Date Issued: 2009
The development of best practice guidelines that will assist small businesses planning
- Authors: Kemp, John Morne
- Date: 2009
- Subjects: Small business-- Finance , New business enterprises -- Finance , New business enterprises -- Planning , Business planning
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: vital:8799 , http://hdl.handle.net/10948/d1016153
- Description: The research problem addressed in this study was to provide a planning guideline for Small, Medium and Micro Enterprises (SMME’s) to assist them to plan more effectively and be sustainable in their businesses. A guideline for planning is needed, as planning is one of the most difficult activities a business owner needs to undertake. Yet it is essential to do because, before taking action, you must know where you are going and how to get there. Well-developed plans can assist the business owner to interest banks and/or investors to invest in the business, guide the owner in operating the business, give direction to and motivate employees, and provide an environment to attract customers and prospective employees. To become an effective business owner, one must look ahead. Planning, which is the process of setting objectives and devising actions to achieve those objectives are imperative to be sustainable in business. The findings of the literature survey clearly highlights the reasons why a business owner needs to plan and provide a guideline how to plan. It was found in the empirical study that Standard Bank rate the SMME market as a very valuable part of their business. The SMME market has a benefit to various departments within the bank, not only the SMME business market. The empirical study also found that not every entrepreneur that holds a business plan is successful. Many reasons for this exist. One aspect that was identified, is that the wrong idea was implemented. The empirical study revealed that in all respondents agreed that planning forms an integral part of the entrepreneurs business. The empirical study found that a business plan will assist the entrepreneur to be sustainable in their business, only if a thorough feasibility study was conducted. The respondents agreed that the feasibility study, will either support or contradict the assumptions made in the business plan, this will assist the entrepreneur to decide to either continue or end the business activity. It was found that the entrepreneur, with especially a financial expert should be involved when a business planning is undertaken. Other experts in the various business arenas should also be requested to assist with the setting up of the business plan.
- Full Text:
- Date Issued: 2009
- Authors: Kemp, John Morne
- Date: 2009
- Subjects: Small business-- Finance , New business enterprises -- Finance , New business enterprises -- Planning , Business planning
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: vital:8799 , http://hdl.handle.net/10948/d1016153
- Description: The research problem addressed in this study was to provide a planning guideline for Small, Medium and Micro Enterprises (SMME’s) to assist them to plan more effectively and be sustainable in their businesses. A guideline for planning is needed, as planning is one of the most difficult activities a business owner needs to undertake. Yet it is essential to do because, before taking action, you must know where you are going and how to get there. Well-developed plans can assist the business owner to interest banks and/or investors to invest in the business, guide the owner in operating the business, give direction to and motivate employees, and provide an environment to attract customers and prospective employees. To become an effective business owner, one must look ahead. Planning, which is the process of setting objectives and devising actions to achieve those objectives are imperative to be sustainable in business. The findings of the literature survey clearly highlights the reasons why a business owner needs to plan and provide a guideline how to plan. It was found in the empirical study that Standard Bank rate the SMME market as a very valuable part of their business. The SMME market has a benefit to various departments within the bank, not only the SMME business market. The empirical study also found that not every entrepreneur that holds a business plan is successful. Many reasons for this exist. One aspect that was identified, is that the wrong idea was implemented. The empirical study revealed that in all respondents agreed that planning forms an integral part of the entrepreneurs business. The empirical study found that a business plan will assist the entrepreneur to be sustainable in their business, only if a thorough feasibility study was conducted. The respondents agreed that the feasibility study, will either support or contradict the assumptions made in the business plan, this will assist the entrepreneur to decide to either continue or end the business activity. It was found that the entrepreneur, with especially a financial expert should be involved when a business planning is undertaken. Other experts in the various business arenas should also be requested to assist with the setting up of the business plan.
- Full Text:
- Date Issued: 2009
The effectiveness of traditional leaders in the development of the rural Eastern Cape
- Authors: Kewana, Nonzaliseko Gladys
- Date: 2009
- Subjects: Local government -- South Africa -- Eastern Cape , Tribal government -- South Africa -- Eastern Cape , Rural development -- South Africa -- Eastern Cape , Political leadership -- South Africa
- Language: English
- Type: Thesis , Masters , M Soc Sc (Dev)
- Identifier: vital:11411 , http://hdl.handle.net/10353/296 , Local government -- South Africa -- Eastern Cape , Tribal government -- South Africa -- Eastern Cape , Rural development -- South Africa -- Eastern Cape , Political leadership -- South Africa
- Description: Traditional leadership is a contested field in social and political environments. The new, democratic government has created an environment that accommodates the existence of traditional leadership by introducing policies that guide their functioning. The White Paper on Traditional Leadership of 2003 spells out the roles and responsibilities of traditional leaders. This document when used with the Municipal Structures Act 117 of 2003 may minimise the existing tensions between the traditional leaders and the democratically elected councillors. The White Paper on Traditional Leadership of 2003 has been designed accordingly with the Bill of Rights. Equality and prevention of unfair discrimination, has been entrenched in the Bill of Rights of the Republic of South Africa. Traditional leaders, therefore, do have a space in the governance of South Africa. They are expected to participate in development programmes and in promoting service delivery. This study used the method of a case study. It is a qualitative study. Questionnaires and interviews are tools used to collect data. Various observations and findings were made with proposed recommendations. Most important to note is that, the traditional leaders are aware of the White Paper on Traditional Leadership but do not know what to do about it. This reveals that there is a gap between practice and policy. is the recommendation of the study that, the officials from Local Government and Traditional Affairs and those from the municipalities workshop and mentor the traditional leaders as well as the democratically elected councillors. Such a practice could minimise if not eliminate the tensions that result in poor service delivery.
- Full Text:
- Date Issued: 2009
- Authors: Kewana, Nonzaliseko Gladys
- Date: 2009
- Subjects: Local government -- South Africa -- Eastern Cape , Tribal government -- South Africa -- Eastern Cape , Rural development -- South Africa -- Eastern Cape , Political leadership -- South Africa
- Language: English
- Type: Thesis , Masters , M Soc Sc (Dev)
- Identifier: vital:11411 , http://hdl.handle.net/10353/296 , Local government -- South Africa -- Eastern Cape , Tribal government -- South Africa -- Eastern Cape , Rural development -- South Africa -- Eastern Cape , Political leadership -- South Africa
- Description: Traditional leadership is a contested field in social and political environments. The new, democratic government has created an environment that accommodates the existence of traditional leadership by introducing policies that guide their functioning. The White Paper on Traditional Leadership of 2003 spells out the roles and responsibilities of traditional leaders. This document when used with the Municipal Structures Act 117 of 2003 may minimise the existing tensions between the traditional leaders and the democratically elected councillors. The White Paper on Traditional Leadership of 2003 has been designed accordingly with the Bill of Rights. Equality and prevention of unfair discrimination, has been entrenched in the Bill of Rights of the Republic of South Africa. Traditional leaders, therefore, do have a space in the governance of South Africa. They are expected to participate in development programmes and in promoting service delivery. This study used the method of a case study. It is a qualitative study. Questionnaires and interviews are tools used to collect data. Various observations and findings were made with proposed recommendations. Most important to note is that, the traditional leaders are aware of the White Paper on Traditional Leadership but do not know what to do about it. This reveals that there is a gap between practice and policy. is the recommendation of the study that, the officials from Local Government and Traditional Affairs and those from the municipalities workshop and mentor the traditional leaders as well as the democratically elected councillors. Such a practice could minimise if not eliminate the tensions that result in poor service delivery.
- Full Text:
- Date Issued: 2009
Molecular and biochemical analysis of the diet of the black rhinoceros
- Authors: Kgopa, Ananias Hodi
- Date: 2009 , 2013-07-15
- Subjects: Black rhinoceros -- South Africa -- Eastern Cape , Browse (Animal food) -- South Africa -- Eastern Cape -- Analysis , Black rhinoceros -- Manure -- Analysis , Phenols , Antioxidants , Plant ecology -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4064 , http://hdl.handle.net/10962/d1004721 , Black rhinoceros -- South Africa -- Eastern Cape , Browse (Animal food) -- South Africa -- Eastern Cape -- Analysis , Black rhinoceros -- Manure -- Analysis , Phenols , Antioxidants , Plant ecology -- South Africa -- Eastern Cape
- Description: The black rhinoceros, Diceros bicornis, is listed as critically endangered. The black rhinoceros population in the Great Fish River Reserve (GFRR) has increased steadily to a current estimate of one hundred animals since the re-introduction of four animals in 1986. In an effort to contribute to the effective conservation and management of this species, dietary composition was studied in the medium Portulcaria thicket vegetation of the GFRR. This study used a molecular approach to determine the diet of the black rhinoceros of the GFRR by sequencing the ribulose bisphosphate carboxylase large subunit (rbcL) gene in plants and dung. Twenty-three plant species were collected from the reserve, and 802 bp of the rbcL gene were sequenced. These plant sequences were used as a reference database for the identification of plant sequences generated from black rhinoceros dung. Initial studies investigated the amplification, cloning and sequencing of DNA extracted from the dung samples which indicated the viability of the molecular approach. Thereafter, dung generated rbcL DNA was analyzed by GS FLX sequencing. Of the plant sequences identified by comparison to the GenBank database, Carissa bispinosa was the most prevalent. The study further characterized the antioxidant activities and phenolic content of plants eaten by the black rhinoceros using four different assays. Phyllanthus verrucosus, Putterlickia pyracantha, Maytenus capitata, Euclea undulata and Ozoroa mucrunata consistently had high antioxidant activities when assayed against 2,2-azinobis (3-ethyl benzothiazolium-6-sulfonic acid) (ABTSʹ⁺), 2,2-diphenyl-1-picrylhydrazyl (DPPHʹ), and ferric reducing antioxidant potentials (FRAP) and phenolic content when evaluated using the Folin-Ciocalteu assay. The majority of plants investigated showed low antioxidant potentials and low phenolic content. The extent to which antioxidants influenced the browse selection by the black rhinoceros remains inconclusive.
- Full Text:
- Date Issued: 2009
- Authors: Kgopa, Ananias Hodi
- Date: 2009 , 2013-07-15
- Subjects: Black rhinoceros -- South Africa -- Eastern Cape , Browse (Animal food) -- South Africa -- Eastern Cape -- Analysis , Black rhinoceros -- Manure -- Analysis , Phenols , Antioxidants , Plant ecology -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4064 , http://hdl.handle.net/10962/d1004721 , Black rhinoceros -- South Africa -- Eastern Cape , Browse (Animal food) -- South Africa -- Eastern Cape -- Analysis , Black rhinoceros -- Manure -- Analysis , Phenols , Antioxidants , Plant ecology -- South Africa -- Eastern Cape
- Description: The black rhinoceros, Diceros bicornis, is listed as critically endangered. The black rhinoceros population in the Great Fish River Reserve (GFRR) has increased steadily to a current estimate of one hundred animals since the re-introduction of four animals in 1986. In an effort to contribute to the effective conservation and management of this species, dietary composition was studied in the medium Portulcaria thicket vegetation of the GFRR. This study used a molecular approach to determine the diet of the black rhinoceros of the GFRR by sequencing the ribulose bisphosphate carboxylase large subunit (rbcL) gene in plants and dung. Twenty-three plant species were collected from the reserve, and 802 bp of the rbcL gene were sequenced. These plant sequences were used as a reference database for the identification of plant sequences generated from black rhinoceros dung. Initial studies investigated the amplification, cloning and sequencing of DNA extracted from the dung samples which indicated the viability of the molecular approach. Thereafter, dung generated rbcL DNA was analyzed by GS FLX sequencing. Of the plant sequences identified by comparison to the GenBank database, Carissa bispinosa was the most prevalent. The study further characterized the antioxidant activities and phenolic content of plants eaten by the black rhinoceros using four different assays. Phyllanthus verrucosus, Putterlickia pyracantha, Maytenus capitata, Euclea undulata and Ozoroa mucrunata consistently had high antioxidant activities when assayed against 2,2-azinobis (3-ethyl benzothiazolium-6-sulfonic acid) (ABTSʹ⁺), 2,2-diphenyl-1-picrylhydrazyl (DPPHʹ), and ferric reducing antioxidant potentials (FRAP) and phenolic content when evaluated using the Folin-Ciocalteu assay. The majority of plants investigated showed low antioxidant potentials and low phenolic content. The extent to which antioxidants influenced the browse selection by the black rhinoceros remains inconclusive.
- Full Text:
- Date Issued: 2009
The evaluation of Eudragit microcapsules manufactured by solvent evaporation using USP Apparatus 1
- Khamanga, Sandile M, Parfitt, Natalie R, Nyamuzhiwa, Tsitsi, Haidula, Hendrina, Walker, Roderick B
- Authors: Khamanga, Sandile M , Parfitt, Natalie R , Nyamuzhiwa, Tsitsi , Haidula, Hendrina , Walker, Roderick B
- Date: 2009
- Language: English
- Type: text , Article
- Identifier: vital:6389 , http://hdl.handle.net/10962/d1006310
- Description: The objectives of this study were to prepare microcapsules containing verapamil and propranolol and to evaluate the kinetics and mechanism of drug release from the microcapsules using USP Apparatus 1. The effects of polymer concentration and polymer type on the cumulative amount of drug released were evaluated. The microcapsules were manufactured using Eudragit RS and RL polymers by solvent evaporation with the ultimate aim of prolonging drug release. Twenty-four formulations were prepared using different drug/polymer ratios. The effects of polymer type and polymer/drug ratios on the size, flow properties, surface morphology, and the release characteristics of the microcapsules were examined. The effects of drug inclusion methods on drug loading, encapsulation efficiency, and release properties of the complex microcapsules were also investigated. The formulations containing drug/polymer ratio 1:4 (w/w) were the most appropriate with respect to encapsulation efficiency (70%), flow properties (HR = 1.2), drug loading (15–20%), and drug release characteristics, in all cases. The release kinetics from the different formulations followed mainly a diffusion-controlled mechanism.
- Full Text:
- Date Issued: 2009
- Authors: Khamanga, Sandile M , Parfitt, Natalie R , Nyamuzhiwa, Tsitsi , Haidula, Hendrina , Walker, Roderick B
- Date: 2009
- Language: English
- Type: text , Article
- Identifier: vital:6389 , http://hdl.handle.net/10962/d1006310
- Description: The objectives of this study were to prepare microcapsules containing verapamil and propranolol and to evaluate the kinetics and mechanism of drug release from the microcapsules using USP Apparatus 1. The effects of polymer concentration and polymer type on the cumulative amount of drug released were evaluated. The microcapsules were manufactured using Eudragit RS and RL polymers by solvent evaporation with the ultimate aim of prolonging drug release. Twenty-four formulations were prepared using different drug/polymer ratios. The effects of polymer type and polymer/drug ratios on the size, flow properties, surface morphology, and the release characteristics of the microcapsules were examined. The effects of drug inclusion methods on drug loading, encapsulation efficiency, and release properties of the complex microcapsules were also investigated. The formulations containing drug/polymer ratio 1:4 (w/w) were the most appropriate with respect to encapsulation efficiency (70%), flow properties (HR = 1.2), drug loading (15–20%), and drug release characteristics, in all cases. The release kinetics from the different formulations followed mainly a diffusion-controlled mechanism.
- Full Text:
- Date Issued: 2009