Metabolic energy relations in the Eastern Cape Angulate Tortoise (Chersina Anguluta)
- Authors: Setlalekgomo, Mpho Rinah
- Date: 2010
- Subjects: Eastern Cape angulate Tortoise , Oxygen consumption (Physiology)
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:10690 , http://hdl.handle.net/10948/1400 , Eastern Cape angulate Tortoise , Oxygen consumption (Physiology)
- Description: The daily oxygen consumption (VO2) pattern, the effects of varying ambient temperatures, season and mass on the resting oxygen consumption (RVO2) of Chersina angulata of the Eastern Cape were investigated. The RVO2 was measured using flow-through respirometry and specific resting oxygen consumption (sRVO2) calculated. To determine the daily pattern in the VO2 of C. angulata, the tortoises were acclimated in an environmentally controlled room (ECR) to an ambient temperature of 26 ± 1°C and a light regime of 14 hours of light and 10 hours of darkness (14L:10D) for at least a week prior to the RVO2 measurements. The RVO2 was measured at a constant temperature of 26 ± 1°C, and at three different light regimes, namely: 14L:10D, constant darkness (DD) and constant light (LL). There were no significant effects of mass or gender on the sRVO2 of the tortoises used. Rhythms in the sRVO2 were detected under all three light regimes. The amplitudes of the rhythm were largest at 14L:10D, followed by DD and smallest at LL regime. The persistence of the rhythmic pattern under constant conditions suggests the existence of an endogenous circadian rhythm in the sRVO2 for adult C. angulata. To test for the effect of ambient temperature on the sRVO2 of adult C. angulata, the tortoises were acclimated to 22 ± 1°C and a 14L:10D light regime prior to the RVO2 measurements. RVO2 was measured at eight experimental temperatures; 14°C, 18°C, 22°C, 26°C, 30°C, 35°C, 38°C and 40°C. The sRVO2 was not influenced by gender and increased with experimental temperatures, but this did not happen consistently over the whole range of temperatures tested. A plateau, possibly a thermal preferendum zone, was detected within the temperature range of 26 - 38°C. Determination of seasonal effect on the sRVO2 of adult C. angulata was accomplished by acclimating tortoises to standard summer and winter conditions. Seasonal effects were tested in the appropriate seasons. Winter experiments were conducted in winter and summer experiments conducted in summer. The RVO2 was measured at experimental temperature 14°C, 18°C and 22°C. In addition RVO2 of iv winter-acclimated tortoises was also measured at 10°C. The sRVO2 increased significantly with increasing temperature within the temperature range tested. No distinct pattern was observed in the seasonal acclimation of adult C. angulata. The metabolic rate-temperature curves of the summer and the winter-acclimated tortoises cross each other. Season and temperature had no significant effects on the mass-scaling exponent of the sRVO2. The exponent ranged from 0.48 to 0.73 within the temperature range of 22 - 38°C. Below and above this temperature range, the exponent ranged from 1.47 to 1.67. An inverse relationship was observed between sRVO2 and body mass over the temperature range of 22 - 38°C. At 14°C and 18°C, sRVO2 increased with body mass, while at 10°C and at 40°C the slope was 1.01.
- Full Text:
- Date Issued: 2010
- Authors: Setlalekgomo, Mpho Rinah
- Date: 2010
- Subjects: Eastern Cape angulate Tortoise , Oxygen consumption (Physiology)
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:10690 , http://hdl.handle.net/10948/1400 , Eastern Cape angulate Tortoise , Oxygen consumption (Physiology)
- Description: The daily oxygen consumption (VO2) pattern, the effects of varying ambient temperatures, season and mass on the resting oxygen consumption (RVO2) of Chersina angulata of the Eastern Cape were investigated. The RVO2 was measured using flow-through respirometry and specific resting oxygen consumption (sRVO2) calculated. To determine the daily pattern in the VO2 of C. angulata, the tortoises were acclimated in an environmentally controlled room (ECR) to an ambient temperature of 26 ± 1°C and a light regime of 14 hours of light and 10 hours of darkness (14L:10D) for at least a week prior to the RVO2 measurements. The RVO2 was measured at a constant temperature of 26 ± 1°C, and at three different light regimes, namely: 14L:10D, constant darkness (DD) and constant light (LL). There were no significant effects of mass or gender on the sRVO2 of the tortoises used. Rhythms in the sRVO2 were detected under all three light regimes. The amplitudes of the rhythm were largest at 14L:10D, followed by DD and smallest at LL regime. The persistence of the rhythmic pattern under constant conditions suggests the existence of an endogenous circadian rhythm in the sRVO2 for adult C. angulata. To test for the effect of ambient temperature on the sRVO2 of adult C. angulata, the tortoises were acclimated to 22 ± 1°C and a 14L:10D light regime prior to the RVO2 measurements. RVO2 was measured at eight experimental temperatures; 14°C, 18°C, 22°C, 26°C, 30°C, 35°C, 38°C and 40°C. The sRVO2 was not influenced by gender and increased with experimental temperatures, but this did not happen consistently over the whole range of temperatures tested. A plateau, possibly a thermal preferendum zone, was detected within the temperature range of 26 - 38°C. Determination of seasonal effect on the sRVO2 of adult C. angulata was accomplished by acclimating tortoises to standard summer and winter conditions. Seasonal effects were tested in the appropriate seasons. Winter experiments were conducted in winter and summer experiments conducted in summer. The RVO2 was measured at experimental temperature 14°C, 18°C and 22°C. In addition RVO2 of iv winter-acclimated tortoises was also measured at 10°C. The sRVO2 increased significantly with increasing temperature within the temperature range tested. No distinct pattern was observed in the seasonal acclimation of adult C. angulata. The metabolic rate-temperature curves of the summer and the winter-acclimated tortoises cross each other. Season and temperature had no significant effects on the mass-scaling exponent of the sRVO2. The exponent ranged from 0.48 to 0.73 within the temperature range of 22 - 38°C. Below and above this temperature range, the exponent ranged from 1.47 to 1.67. An inverse relationship was observed between sRVO2 and body mass over the temperature range of 22 - 38°C. At 14°C and 18°C, sRVO2 increased with body mass, while at 10°C and at 40°C the slope was 1.01.
- Full Text:
- Date Issued: 2010
Nature, narrative and language in Marlene van Niekerk's Agaat
- Authors: Moore-Barnes, Shannon-Lee
- Date: 2010
- Subjects: Van Niekerk, Marlene. Agaat , Narration (Rhetoric) , Storytelling , Women and literature -- South Africa , Afrikaans fiction -- 21st century
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:8453 , http://hdl.handle.net/10948/1235 , Van Niekerk, Marlene. Agaat , Narration (Rhetoric) , Storytelling , Women and literature -- South Africa , Afrikaans fiction -- 21st century
- Description: Conrad Aiken’s observation that the “landscape and the language are the same, and we ourselves are language and are land,” depicts the material terrain we inhabit as necessarily informing the language we speak. An important corollary to Aiken’s observation is language itself writes the land. I argue that the binary division between culture and nature, as well as the attempts to universalise languages, abstracts discourse from necessary situated knowledges, alienating the land from the language it embodies. The severing of culture and nature as implied by Aiken’s observation is indicative of humanity’s progressive isolation from the land through language, as well as from their embodied natures. Remoteness results in what Marlene van Niekerk’s novel Agaat (2006) terms a “poverty disease” (2006: 251). Michiel Heyns confirms that the character Agaat relates this barrenness of spirit to her “diagnosis of spiritual ills through human dealings with the soil” (2009: 132). I illustrate the novel’s revitalisation of language as an act of ecological recuperation that alleviates dis-eased consciousnesses by potentially recognising, valuing and responding to situated knowledges revealed in land narratives.1 My argument therefore uncovers the challenges that the novel directs at an unreformed and universal Western2 To this end I use critiques of colonialism that reveal culture’s assimilation of the Other, rationalist discourse that continues to appropriate nature as resource for a hierarchical culture. 3 By combining this literary analysis with a wider eco-theoretical enquiry I position my study in an interdisciplinary field of investigation. This is in response to the damaging consequences of the inherited and fragmentary nature of specialisation. In addition, by detailing literary and feminist especially the work of Val Plumwood, Donna Haraway and Nicole Brossard. I use these critiques to analyse self/Other oppositions that Western culture constructs and patrols to maintain a defensive culture of domination. I show how nature and all those feminised and marginalised by Western discourses that hierarchise culture have been consistently overlooked and under-represented by those who purport to ‘control’ the environment and privilege the symbolic language as the carrier of culture. Agaat provides fruitful terrain for the reflection of marginalised voices; voices that confirm the environment and language as necessarily both feminist and social justice issues. 1 My preference for the hyphenated usage of the word ‘dis-ease’ signals the equation between discomfort or unease and disease or sickness. 2 While I am concerned over emphasising words such as Western and Apartheid by capitalising them, I have decided to retain this form so as not to diminish the magnitude of the effect these discourses have had on global and regional communities. 3 When referring to Others I, like Karen J. Warren, capitalise the term. Warren defines Others as all earth Others subjected to “unjustified domination-subordination relationships” (2005: 252). responses to Western patriarchal discourse and its impact on nature, I show the ways in which literature negotiates the possible re-conceptualisation of our collective cultural imagination. Van Niekerk’s novel offers a sustained critique of the oppressive Western conceptual frameworks that have dominated Others through hegemonic constructions. Furthermore, I investigate what this writer might offer as an alternative to systems of social, political and ecological control and the violence it inflicts.
- Full Text:
- Date Issued: 2010
- Authors: Moore-Barnes, Shannon-Lee
- Date: 2010
- Subjects: Van Niekerk, Marlene. Agaat , Narration (Rhetoric) , Storytelling , Women and literature -- South Africa , Afrikaans fiction -- 21st century
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:8453 , http://hdl.handle.net/10948/1235 , Van Niekerk, Marlene. Agaat , Narration (Rhetoric) , Storytelling , Women and literature -- South Africa , Afrikaans fiction -- 21st century
- Description: Conrad Aiken’s observation that the “landscape and the language are the same, and we ourselves are language and are land,” depicts the material terrain we inhabit as necessarily informing the language we speak. An important corollary to Aiken’s observation is language itself writes the land. I argue that the binary division between culture and nature, as well as the attempts to universalise languages, abstracts discourse from necessary situated knowledges, alienating the land from the language it embodies. The severing of culture and nature as implied by Aiken’s observation is indicative of humanity’s progressive isolation from the land through language, as well as from their embodied natures. Remoteness results in what Marlene van Niekerk’s novel Agaat (2006) terms a “poverty disease” (2006: 251). Michiel Heyns confirms that the character Agaat relates this barrenness of spirit to her “diagnosis of spiritual ills through human dealings with the soil” (2009: 132). I illustrate the novel’s revitalisation of language as an act of ecological recuperation that alleviates dis-eased consciousnesses by potentially recognising, valuing and responding to situated knowledges revealed in land narratives.1 My argument therefore uncovers the challenges that the novel directs at an unreformed and universal Western2 To this end I use critiques of colonialism that reveal culture’s assimilation of the Other, rationalist discourse that continues to appropriate nature as resource for a hierarchical culture. 3 By combining this literary analysis with a wider eco-theoretical enquiry I position my study in an interdisciplinary field of investigation. This is in response to the damaging consequences of the inherited and fragmentary nature of specialisation. In addition, by detailing literary and feminist especially the work of Val Plumwood, Donna Haraway and Nicole Brossard. I use these critiques to analyse self/Other oppositions that Western culture constructs and patrols to maintain a defensive culture of domination. I show how nature and all those feminised and marginalised by Western discourses that hierarchise culture have been consistently overlooked and under-represented by those who purport to ‘control’ the environment and privilege the symbolic language as the carrier of culture. Agaat provides fruitful terrain for the reflection of marginalised voices; voices that confirm the environment and language as necessarily both feminist and social justice issues. 1 My preference for the hyphenated usage of the word ‘dis-ease’ signals the equation between discomfort or unease and disease or sickness. 2 While I am concerned over emphasising words such as Western and Apartheid by capitalising them, I have decided to retain this form so as not to diminish the magnitude of the effect these discourses have had on global and regional communities. 3 When referring to Others I, like Karen J. Warren, capitalise the term. Warren defines Others as all earth Others subjected to “unjustified domination-subordination relationships” (2005: 252). responses to Western patriarchal discourse and its impact on nature, I show the ways in which literature negotiates the possible re-conceptualisation of our collective cultural imagination. Van Niekerk’s novel offers a sustained critique of the oppressive Western conceptual frameworks that have dominated Others through hegemonic constructions. Furthermore, I investigate what this writer might offer as an alternative to systems of social, political and ecological control and the violence it inflicts.
- Full Text:
- Date Issued: 2010
Lag length selection for vector error correction models
- Authors: Sharp, Gary David
- Date: 2010
- Subjects: Akaike Information Criterion Mathematical models -- Evaluation Autoregression (Statistics) Error analysis (Mathematics)
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5568 , http://hdl.handle.net/10962/d1002808
- Description: This thesis investigates the problem of model identification in a Vector Autoregressive framework. The study reviews the existing research, conducts an extensive simulation based analysis of thirteen information theoretic criterion (IC), one of which is a novel derivation. The simulation exercise considers the evaluation of seven alternative error restricted vector autoregressive models with four different lag lengths. Alternative sample sizes and parameterisations are also evaluated and compared to results in the existing literature. The results of the comparative analysis provide strong support for the efficiency based criterion of Akaike and in particular the selection capability of the novel criterion, referred to as a modified corrected Akaike information criterion, demonstrates useful finite sample properties.
- Full Text:
- Date Issued: 2010
- Authors: Sharp, Gary David
- Date: 2010
- Subjects: Akaike Information Criterion Mathematical models -- Evaluation Autoregression (Statistics) Error analysis (Mathematics)
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5568 , http://hdl.handle.net/10962/d1002808
- Description: This thesis investigates the problem of model identification in a Vector Autoregressive framework. The study reviews the existing research, conducts an extensive simulation based analysis of thirteen information theoretic criterion (IC), one of which is a novel derivation. The simulation exercise considers the evaluation of seven alternative error restricted vector autoregressive models with four different lag lengths. Alternative sample sizes and parameterisations are also evaluated and compared to results in the existing literature. The results of the comparative analysis provide strong support for the efficiency based criterion of Akaike and in particular the selection capability of the novel criterion, referred to as a modified corrected Akaike information criterion, demonstrates useful finite sample properties.
- Full Text:
- Date Issued: 2010
An investigation of the continued relevance of Faludi's Backlash (1992) for the negotiation of gender identity, in the wake of the "Lara Croft" phenomenon
- Authors: Van Antwerpen, Lee-Anne
- Date: 2010
- Subjects: Gender identity in mass media , Feminism , Feminism -- Public opinion , Women -- Social conditions , Women -- Psychology
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:8390 , http://hdl.handle.net/10948/1129 , Gender identity in mass media , Feminism , Feminism -- Public opinion , Women -- Social conditions , Women -- Psychology
- Description: In the 1990s, Susan Faludi’s Backlash: The Undeclared War Against Women (1992) was arguably of signal importance in the thematization of the limits imposed by the media on the negotiation of gender identity. However, the utilization of Faludi’s various analyses, in the interest of rendering social critique, has become progressively more problematic during the first decade of the 21st century. This is because her analyses engage neither with the development of media technologies subsequent to the early 1990s, nor with the way in which such technological developments now engage audiences on a greater multiplicity of levels than before, in a manner that consequently stands to inform their subjectivity to a degree hitherto unimagined. (A good example of the latter would, of course, be the proliferation of interactive exchanges on the World Wide Web). As such, in the light of such technological developments, this treatise is orientated around an investigation of the continued relevance of Faludi’s Backlash (1992) for the negotiation of gender identity in the contemporary era. In particular, its focus falls on West’s film Lara Croft: Tomb Raider (2001), which is considered against the backdrop of the Lara Croft: Tomb Raider phenomenon, which encompasses sequels to the film, online interactive sites, graphic novels, figurines, and video games, among other products. This investigation draws on the reception theory of, on the one hand, Adorno and Horkheimer, and, on the other hand, Stuart Hall.
- Full Text:
- Date Issued: 2010
- Authors: Van Antwerpen, Lee-Anne
- Date: 2010
- Subjects: Gender identity in mass media , Feminism , Feminism -- Public opinion , Women -- Social conditions , Women -- Psychology
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:8390 , http://hdl.handle.net/10948/1129 , Gender identity in mass media , Feminism , Feminism -- Public opinion , Women -- Social conditions , Women -- Psychology
- Description: In the 1990s, Susan Faludi’s Backlash: The Undeclared War Against Women (1992) was arguably of signal importance in the thematization of the limits imposed by the media on the negotiation of gender identity. However, the utilization of Faludi’s various analyses, in the interest of rendering social critique, has become progressively more problematic during the first decade of the 21st century. This is because her analyses engage neither with the development of media technologies subsequent to the early 1990s, nor with the way in which such technological developments now engage audiences on a greater multiplicity of levels than before, in a manner that consequently stands to inform their subjectivity to a degree hitherto unimagined. (A good example of the latter would, of course, be the proliferation of interactive exchanges on the World Wide Web). As such, in the light of such technological developments, this treatise is orientated around an investigation of the continued relevance of Faludi’s Backlash (1992) for the negotiation of gender identity in the contemporary era. In particular, its focus falls on West’s film Lara Croft: Tomb Raider (2001), which is considered against the backdrop of the Lara Croft: Tomb Raider phenomenon, which encompasses sequels to the film, online interactive sites, graphic novels, figurines, and video games, among other products. This investigation draws on the reception theory of, on the one hand, Adorno and Horkheimer, and, on the other hand, Stuart Hall.
- Full Text:
- Date Issued: 2010
A framework for recuperation: HIV/AIDS and the Keiskamma Altarpiece
- Authors: Schmahmann, Brenda
- Date: 2010
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/147593 , vital:38652 , https://doi.org/10.1162/afar.2010.43.3.34
- Description: South Africa has the largest number of people living with HIV of any nation in the world. While various conditions and circumstances have made South Africa especially susceptible to an HIV/AIDS pandemic, its leadership has not recognized the impact of the disease or found appropriate strategies to address rising rates of infection. Thabo Mbeki's presidency (1999—2008) and the appointment of Manto Tshabalala-Msimang as his health minister were disastrous in terms of the pandemic.
- Full Text:
- Date Issued: 2010
- Authors: Schmahmann, Brenda
- Date: 2010
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/147593 , vital:38652 , https://doi.org/10.1162/afar.2010.43.3.34
- Description: South Africa has the largest number of people living with HIV of any nation in the world. While various conditions and circumstances have made South Africa especially susceptible to an HIV/AIDS pandemic, its leadership has not recognized the impact of the disease or found appropriate strategies to address rising rates of infection. Thabo Mbeki's presidency (1999—2008) and the appointment of Manto Tshabalala-Msimang as his health minister were disastrous in terms of the pandemic.
- Full Text:
- Date Issued: 2010
Perceptions of psychologists regarding the use of religion and spirituality in therapy
- Authors: Naicker, Samantha
- Date: 2010
- Subjects: Psychology and religion , Psychiatry and religion , Counseling -- Religious aspects , Psychotherapy -- Religious aspects , Spirituality
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:9875 , http://hdl.handle.net/10948/1363 , Psychology and religion , Psychiatry and religion , Counseling -- Religious aspects , Psychotherapy -- Religious aspects , Spirituality
- Description: Religion and spirituality are acknowledged coping resources, yet for many years, the use of religion and spirituality was not practiced in therapy. Psychologists were once branded the least religious of all academicians; however there is evidence of an integration of psychology with religion and spirituality. Recently, studies have been conducted to prove the success of using religion and spirituality to cope with psychological disorders, prevent unhealthy behaviours and promote resilience. Despite this, very little research to date has explored South African psychologists’ perceptions on this matter. This study aimed to explore the perceptions of psychologists in the Nelson Mandela Metropolitan Municipality area about the use of religion and spirituality in therapy. Purposive sampling was employed to obtain a sample and focus groups were used to the collect data. The data was analyzed using Tesch’s model of qualitative content analysis. Many themes emerged from the data analysis process. The participants indicated that they perceive the definitions of religion and spirituality as difficult to define and reach consensus on. Nevertheless, the participants recognized that religion and spirituality are important aspects of their clients’ lives and that they cannot be ignored in therapy. Particular emphasis was placed on the fact that religion and spirituality are coping mechanisms for both clients and psychologists. Most of the participants indicated that they were willing to discuss religion and spirituality with their clients if they brought it up. The participants highlighted specific factors that made it possible for them to engage with their clients on religious and spiritual levels, and factors that made it difficult for them to do so. The value of the research was discussed. Limitations of the study were also highlighted and based on these, recommendations for future research were outlined.
- Full Text:
- Date Issued: 2010
- Authors: Naicker, Samantha
- Date: 2010
- Subjects: Psychology and religion , Psychiatry and religion , Counseling -- Religious aspects , Psychotherapy -- Religious aspects , Spirituality
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:9875 , http://hdl.handle.net/10948/1363 , Psychology and religion , Psychiatry and religion , Counseling -- Religious aspects , Psychotherapy -- Religious aspects , Spirituality
- Description: Religion and spirituality are acknowledged coping resources, yet for many years, the use of religion and spirituality was not practiced in therapy. Psychologists were once branded the least religious of all academicians; however there is evidence of an integration of psychology with religion and spirituality. Recently, studies have been conducted to prove the success of using religion and spirituality to cope with psychological disorders, prevent unhealthy behaviours and promote resilience. Despite this, very little research to date has explored South African psychologists’ perceptions on this matter. This study aimed to explore the perceptions of psychologists in the Nelson Mandela Metropolitan Municipality area about the use of religion and spirituality in therapy. Purposive sampling was employed to obtain a sample and focus groups were used to the collect data. The data was analyzed using Tesch’s model of qualitative content analysis. Many themes emerged from the data analysis process. The participants indicated that they perceive the definitions of religion and spirituality as difficult to define and reach consensus on. Nevertheless, the participants recognized that religion and spirituality are important aspects of their clients’ lives and that they cannot be ignored in therapy. Particular emphasis was placed on the fact that religion and spirituality are coping mechanisms for both clients and psychologists. Most of the participants indicated that they were willing to discuss religion and spirituality with their clients if they brought it up. The participants highlighted specific factors that made it possible for them to engage with their clients on religious and spiritual levels, and factors that made it difficult for them to do so. The value of the research was discussed. Limitations of the study were also highlighted and based on these, recommendations for future research were outlined.
- Full Text:
- Date Issued: 2010
Public green space inequality in small towns in South Africa
- McConnachie, Matthew M, Shackleton, Charlie M
- Authors: McConnachie, Matthew M , Shackleton, Charlie M
- Date: 2010
- Language: English
- Type: Article
- Identifier: vital:6644 , http://hdl.handle.net/10962/d1006874
- Description: The distribution of public green space within towns is frequently uneven, and influenced by attributes such as its location relative to the commercial core, as well as the ethnicity and relative wealth and education of the residents. Yet most studies are from large cities in developed countries. In contrast, this study reports on the distribution of public green space across 9 small towns in a developing country, namely South Africa, which offers a unique case study because of its former racially defined settlement patterns. We do so using GIS analysis of aerial photographs focusing on 3 types of suburbs in each town, defined on the basis of wealth as well as race-based history under the previous apartheid regime. The more affluent suburbs, inhabited mainly by whites, have the lowest density of housing and the highest area of green space per capita. Proportionally, they have a similar area under public green space as to the previously racially defined townships, but because of the lower housing density, they have a greater area per person. The newly built low-cost housing areas (termed RDP suburbs), occupied largely by poor black South Africans, are poorly endowed with public green space, and fare worse than the other 2 suburb types on all attributes measured. This needs to be addressed in further low-cost housing developments.
- Full Text:
- Date Issued: 2010
- Authors: McConnachie, Matthew M , Shackleton, Charlie M
- Date: 2010
- Language: English
- Type: Article
- Identifier: vital:6644 , http://hdl.handle.net/10962/d1006874
- Description: The distribution of public green space within towns is frequently uneven, and influenced by attributes such as its location relative to the commercial core, as well as the ethnicity and relative wealth and education of the residents. Yet most studies are from large cities in developed countries. In contrast, this study reports on the distribution of public green space across 9 small towns in a developing country, namely South Africa, which offers a unique case study because of its former racially defined settlement patterns. We do so using GIS analysis of aerial photographs focusing on 3 types of suburbs in each town, defined on the basis of wealth as well as race-based history under the previous apartheid regime. The more affluent suburbs, inhabited mainly by whites, have the lowest density of housing and the highest area of green space per capita. Proportionally, they have a similar area under public green space as to the previously racially defined townships, but because of the lower housing density, they have a greater area per person. The newly built low-cost housing areas (termed RDP suburbs), occupied largely by poor black South Africans, are poorly endowed with public green space, and fare worse than the other 2 suburb types on all attributes measured. This needs to be addressed in further low-cost housing developments.
- Full Text:
- Date Issued: 2010
A psychobiographical study of Ralph John Rabie
- Uys, Hendrick Michael Grobler
- Authors: Uys, Hendrick Michael Grobler
- Date: 2010
- Subjects: Kerkorrel, Johannes, 1960-2002 , Psychology -- Biographical methods , Rock musicians -- South Africa Biography , Afrikaners -- Psychology
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:9874 , http://hdl.handle.net/10948/1366 , Kerkorrel, Johannes, 1960-2002 , Psychology -- Biographical methods , Rock musicians -- South Africa Biography , Afrikaners -- Psychology
- Description: Psychobiographies use psychological theory as a paradigm within which to re-awaken an individual’s life story. The psychobiographical approach historically tended to be neglected within the South African context. The aim of the current study was to explore and describe the life of Ralph John Rabie through the use of psychobiography. Ralph John Rabie (1960 – 2002) was a South African Afrikaans singer-songwriter, journalist and playwright, also known as Johannes Kerkorrel. He challenged the cultural system and the government and was arguably the most prominent member of the Alternative Afrikaans Movement until his suicide on 12 November 2002. To some he betrayed the identity of post-apartheid Afrikanerdom and to others he became an icon in the homosexual community. No existing literature to date has adopted a psychological stance on this controversial South African figure. His own writings and published material by others were utilized to illuminate his life and its many dimensions. Richard C. Schwartz’s Internal Family Systems Model (1995) was used to analyze the multiplicity and inner workings of Rabie’s personality. The influence of external systems is also discussed. The data collection and analysis were conducted according to Yin’s (1994) analytic generalization, which consists of using theoretical guidelines as a framework to select relevant data and develop a matrix as a descriptive framework for organizing and integrating the data. Alexander’s (1988) nine proposed guidelines assisted in the process of data analysis, together with the Internal Family Systems Model (1995). The findings of the study indicate that subpersonalities in different roles could be identified in Rabie’s life as described by Schwartz (1995). The different subpersonalities interacted with each other and assumed roles to protect Rabie. The findings of the study also indicated that these subpersonalities used stories to obtain power and influence within Rabie’s personality structure. The subpersonalities were successful in making Rabie influential and famous within the Afrikaans music industry and they helped Rabie change rigid Afrikaans cultural beliefs that were present within the Apartheid system. The findings further indicate how important it is for subpersonalities to work together and how a fragmented system is difficult to contain.
- Full Text:
- Date Issued: 2010
- Authors: Uys, Hendrick Michael Grobler
- Date: 2010
- Subjects: Kerkorrel, Johannes, 1960-2002 , Psychology -- Biographical methods , Rock musicians -- South Africa Biography , Afrikaners -- Psychology
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:9874 , http://hdl.handle.net/10948/1366 , Kerkorrel, Johannes, 1960-2002 , Psychology -- Biographical methods , Rock musicians -- South Africa Biography , Afrikaners -- Psychology
- Description: Psychobiographies use psychological theory as a paradigm within which to re-awaken an individual’s life story. The psychobiographical approach historically tended to be neglected within the South African context. The aim of the current study was to explore and describe the life of Ralph John Rabie through the use of psychobiography. Ralph John Rabie (1960 – 2002) was a South African Afrikaans singer-songwriter, journalist and playwright, also known as Johannes Kerkorrel. He challenged the cultural system and the government and was arguably the most prominent member of the Alternative Afrikaans Movement until his suicide on 12 November 2002. To some he betrayed the identity of post-apartheid Afrikanerdom and to others he became an icon in the homosexual community. No existing literature to date has adopted a psychological stance on this controversial South African figure. His own writings and published material by others were utilized to illuminate his life and its many dimensions. Richard C. Schwartz’s Internal Family Systems Model (1995) was used to analyze the multiplicity and inner workings of Rabie’s personality. The influence of external systems is also discussed. The data collection and analysis were conducted according to Yin’s (1994) analytic generalization, which consists of using theoretical guidelines as a framework to select relevant data and develop a matrix as a descriptive framework for organizing and integrating the data. Alexander’s (1988) nine proposed guidelines assisted in the process of data analysis, together with the Internal Family Systems Model (1995). The findings of the study indicate that subpersonalities in different roles could be identified in Rabie’s life as described by Schwartz (1995). The different subpersonalities interacted with each other and assumed roles to protect Rabie. The findings of the study also indicated that these subpersonalities used stories to obtain power and influence within Rabie’s personality structure. The subpersonalities were successful in making Rabie influential and famous within the Afrikaans music industry and they helped Rabie change rigid Afrikaans cultural beliefs that were present within the Apartheid system. The findings further indicate how important it is for subpersonalities to work together and how a fragmented system is difficult to contain.
- Full Text:
- Date Issued: 2010
Thinking about South African tabloid newspapers:
- Strelitz, Larry N, Steenveld, Lynette N
- Authors: Strelitz, Larry N , Steenveld, Lynette N
- Date: 2010
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/159825 , vital:40347 , DOI: 10.1080/02560054.2005.9653337
- Description: A popular view of tabloids is that they pander to the lowest common denominator of public taste, they simplify complex issues, and they generally fail to provide information that citizens need in order to make informed political judgments - the latter being the raison d’etre of serious newspapers. In summary, tabloids “lower the standards of public discourse” (Ornerbring and Jonson, 2004:283).
- Full Text:
- Date Issued: 2010
- Authors: Strelitz, Larry N , Steenveld, Lynette N
- Date: 2010
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/159825 , vital:40347 , DOI: 10.1080/02560054.2005.9653337
- Description: A popular view of tabloids is that they pander to the lowest common denominator of public taste, they simplify complex issues, and they generally fail to provide information that citizens need in order to make informed political judgments - the latter being the raison d’etre of serious newspapers. In summary, tabloids “lower the standards of public discourse” (Ornerbring and Jonson, 2004:283).
- Full Text:
- Date Issued: 2010
A spectroscopic study of the electronic effects on copper (II) and copper (I) complexes of ligands derived from various substituted benzyaldehyde- and cinnamaldehyde- based schiff bases
- Authors: Magwa, Nomampondo Penelope
- Date: 2010 , 2010-03-19
- Subjects: Copper -- Analysis , Schiff bases , Organometallic compounds
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4407 , http://hdl.handle.net/10962/d1006712 , Copper -- Analysis , Schiff bases , Organometallic compounds
- Description: Several Schiff base ligands, N, N‟-(aryl)benzyaldiimine ligands (R-BEN); N, N‟-(aryl)benzyaldiamine dihydrochloride ligands (R-BENH•2HCl); N, N‟-(aryl)benzyaldiamine ligands (R-BENH); N, N‟-bis(cinnamaldiimine) ligands (R-CA2EN) were synthesized for the investigation of the electronic effect of the substituents at para-position of the Schiff base ligands and their copper complexes. The synthesis of Schiff bases was carried out by reacting a series of para-substituted benzyaldehyde, and para-substituted cinnamaldehyde with ethylenediamine. The imine group of Schiff bases, N, N‟-(aryl)benzyaldiimine ligands and N, N‟-bis(cinnamaldiimine)ligands were reduced to corresponding amines with sodium borohydride in methanol These ligands, N, N‟-(aryl)benzyaldiamine ligands (H-BENH), N, N‟-bis(cinnamaldiimine)ligands (CA2EN) were reacted with copper(II) dihalide and copper(I) monohalide ions respectively to form complexes. The ligands and their complexes were analysed using elemental analyses, FT-IR spectroscopy (mid-IR), UV/vis in aprotic and protic solvents,while mass spectrometry, 1H-NMR and 13C-NMR were used to further analyse the ligands. By using substituent parameters, both the single and dual substituent parameters with the spectroscopic data obtained from the spectroscopic techiques mentioned above, it was hoped to monitor and determine whether the electronic effects (resonance or inductive effcets) was predominantly within the Schiff base ligands and copper complexes. The NMR studies with dual substituent parameters suggest that the effects of the substituents are transimitted through the ligands, via resonance effects and that the phenyl group is nonplanar with the azomethine in N, N‟-(aryl)benzyaldiimine ligands. The presence of an extra double bond in Schiff base {(N, N‟-bis(cinnamaldiimine) ligand)} altered the electron density. The UV/vis studies showed that the symmetry of the N, N‟-bis(4-R-benzyl)-1, 2-diaminoethanedihalidecopper(II) complexes were predominantly tetrahedral for both chloro and bromo complexes. The correlation studies from mid-infrared were beneficial in monitoring the effect experienced by N, N‟-(aryl)benzaldiimine ligands, the studies suggest that the inductive effect is more pronounced at the C=N.
- Full Text:
- Date Issued: 2010
- Authors: Magwa, Nomampondo Penelope
- Date: 2010 , 2010-03-19
- Subjects: Copper -- Analysis , Schiff bases , Organometallic compounds
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4407 , http://hdl.handle.net/10962/d1006712 , Copper -- Analysis , Schiff bases , Organometallic compounds
- Description: Several Schiff base ligands, N, N‟-(aryl)benzyaldiimine ligands (R-BEN); N, N‟-(aryl)benzyaldiamine dihydrochloride ligands (R-BENH•2HCl); N, N‟-(aryl)benzyaldiamine ligands (R-BENH); N, N‟-bis(cinnamaldiimine) ligands (R-CA2EN) were synthesized for the investigation of the electronic effect of the substituents at para-position of the Schiff base ligands and their copper complexes. The synthesis of Schiff bases was carried out by reacting a series of para-substituted benzyaldehyde, and para-substituted cinnamaldehyde with ethylenediamine. The imine group of Schiff bases, N, N‟-(aryl)benzyaldiimine ligands and N, N‟-bis(cinnamaldiimine)ligands were reduced to corresponding amines with sodium borohydride in methanol These ligands, N, N‟-(aryl)benzyaldiamine ligands (H-BENH), N, N‟-bis(cinnamaldiimine)ligands (CA2EN) were reacted with copper(II) dihalide and copper(I) monohalide ions respectively to form complexes. The ligands and their complexes were analysed using elemental analyses, FT-IR spectroscopy (mid-IR), UV/vis in aprotic and protic solvents,while mass spectrometry, 1H-NMR and 13C-NMR were used to further analyse the ligands. By using substituent parameters, both the single and dual substituent parameters with the spectroscopic data obtained from the spectroscopic techiques mentioned above, it was hoped to monitor and determine whether the electronic effects (resonance or inductive effcets) was predominantly within the Schiff base ligands and copper complexes. The NMR studies with dual substituent parameters suggest that the effects of the substituents are transimitted through the ligands, via resonance effects and that the phenyl group is nonplanar with the azomethine in N, N‟-(aryl)benzyaldiimine ligands. The presence of an extra double bond in Schiff base {(N, N‟-bis(cinnamaldiimine) ligand)} altered the electron density. The UV/vis studies showed that the symmetry of the N, N‟-bis(4-R-benzyl)-1, 2-diaminoethanedihalidecopper(II) complexes were predominantly tetrahedral for both chloro and bromo complexes. The correlation studies from mid-infrared were beneficial in monitoring the effect experienced by N, N‟-(aryl)benzaldiimine ligands, the studies suggest that the inductive effect is more pronounced at the C=N.
- Full Text:
- Date Issued: 2010
Tillage and crop rotation impacts on soil, quality parameters and maize yield in Zanyokwe Irrigation Scheme, South Africa
- Authors: Njaimwe, Arnold Ngare
- Date: 2010
- Subjects: No-tillage , Soil mechanics , Soils -- Quality , Cover crops , Corn -- Irrigation
- Language: English
- Type: Thesis , Doctoral , PhD (Soil Science)
- Identifier: vital:11962 , http://hdl.handle.net/10353/460 , No-tillage , Soil mechanics , Soils -- Quality , Cover crops , Corn -- Irrigation
- Description: Intensive tillage and monoculture cropping practices reduce soil C accumulation hence increasing soil vulnerability to chemical, physical and biological degradation. This study focussed on enhancing biomass production of wheat and oat winter cover crops as a means of increasing C sequestration in the low organic C soils of the central part of Eastern Cape Province. The specific objectives were (i) to evaluate the short-term effects of no till and cereal-fallow based crop rotations on; soil organic matter related parameters, pH and electrical conductivity, (ii) soil bulk density, water retention and aggregate stability, (iii) soil microbial biomass C and N, mineralizable N, soil respiration, and dehydrogenase enzyme activity, (iv) grain yield, soil nutrient concentration (N, P and K) and their uptake by maize, and (v) to identify soil parameters with high sensitivity to tillage under maize-fallow-maize, maize-wheat-maize and maize-oat-maize rotational cover cropping practices. The experiment was laid out as a split-plot arrangement in a randomized complete block design with 4 replicates. Tillage treatments (CT and NT) were applied on the main plots which measured 8 × 18 m while crop rotation treatments were applied in the subplots which measured 8 × 6 m. The rotation treatments were maize-fallow-maize (MFM), maize-wheat-maize (MWM) and maize-oat-maize (MOM). Weed control in NT plots involved preplant application of glyphosate to control mainly the grass weeds while post emergence weed management was done using Atrazine (485 atrazine and 15 g l-1 triazines). Initial weed control in CT plots was achieved through ploughing to a depth of 20 cm followed by disking while post emergence weed iii management was done by hand hoeing. Soil parameters measured were; (i) particulate organic matter (POM), soil organic carbon (SOC), total nitrogen (TN), pH and electrical conductivity (EC), (ii) soil bulk density (b), moisture at field capacity (FC), aggregate mean weight diameter (MWD) determined by fast wetting (FW), slow wetting (SW), mechanical breakdown by shaking (MB) and the stability index (SI), (iii) soil microbial biomass C (MBC) and N (MBN), mineralizable N (MN), soil respiration (SR), and dehydrogenase enzyme activity (DHEA). No-till increased POM and TN compared to CT in Lenye and Burnshill, respectively. The MWM and the MOM rotations increased TN relative to the MFM rotation in Lenye. The MWM and MOM rotations enhanced SOC relative to MFM in all sampled soil depths at Burnshill and similar observations were made under MOM rotation in the 5-20 cm depth in Lenye. The MWM and MOM rotations tended to depress soil pH relative to the MFM rotation in both sampled soil depths in Lenye while NT reduced soil pH relative to CT on the surface soil layer in Burnshill. Soil EC and pH varied with depth across tillage practices but both parameters remained within the ideal range for successful crop production over the study period. Soil stability index (SI) and aggregate MWD determined by FW, SW and MB were higher in Lenye compared to Burnshill. The MOM rotation enhanced the SI relative to MFM and MWM rotations at both sites. Scanning electron microscope (SEM) showed that more organic C was incorporated into the soil under NT and MOM rotation compared to CT and MFM rotation which had few organic coatings on the soil particles. Microbial properties varied with plant biomass input as influenced by tillage and type of rotational cover crop at both sites. Like in other past studies, NT showed higher levels of MBC, MBN, NM and SR at the soil surface layer compared to CT in Burnshill. No till increased MN iv relative to CT in both sampled soil depths in Lenye and resulted in higher DHEA compared to CT in Burnshill. The MOM rotation increased MBC, MBN, MN relative to MFM rotation especially within surface soil layer. Similar observations were made with respect to MN and SR in both sampled soil layers at Lenye. By contrast, the DHEA was higher under the MFM relative to the MWM and MOM rotations in Lenye but similar under the MFM and MOM rotations in Burnshill. Maize grain yield was not affected by both tillage and crop rotations but varied with cropping season. Comparable grain yields observed under the two tillage practices with similar fertilizer application rates indicated the advantage of NT over CT in saving on labour costs in maize production without compromising yields. High plant biomass retention under NT relative to CT contributed to high soil N and P levels under the former compared to the latter tillage practice especially on soil surface layer at both study sites. Principal component analysis (PCA) revealed that soil chemical and biological parameters closely linked to organic matter, namely SOC, MN, MBC and MBN showed the highest sensitivity to tillage and crop rotation treatments. Soil aggregate MWD determined by SW and b were the physical parameters which were highly altered by agronomic management practice. The MWM and MOM rotations were clustered together and clearly separated from the MFM rotation and this observed trend only applied to the 0-5 and 5-20 cm depths in Lenye site only. No till, MWM and MOM rotations enhanced POM, SOC and TN relative to CT and MFM rotation suggesting these practices have greater potential to improve soil chemical properties compared to intensive tillage and maize monoculture based production practices. Reduced soil b under MOM rotation and improved SI under NT compared to MFM and CT, respectively v indicate that these practices have the potential to improve degraded soils. Although not significantly different, NT values for MBC, MBN, MN, SR and DHEA were higher compared to CT indicating the potential of the practice to improve soil biotic activity relative to conventional tillage practices. No till enhanced surface soil nitrate N and extractable P compared to CT at both sites revealing the long-term potential of NT in improving the supply of these essential plant nutrients compared to CT. Principal component analysis showed that SOC, MN, K, P, MBC, MBN, soil aggregate MWD determined by SW and b were the most sensitive parameters to tillage and crop rotations. Therefore, these parameters could constitute the minimum data set for assessments of the impact of selected CA practices on soil quality attributes.
- Full Text:
- Date Issued: 2010
- Authors: Njaimwe, Arnold Ngare
- Date: 2010
- Subjects: No-tillage , Soil mechanics , Soils -- Quality , Cover crops , Corn -- Irrigation
- Language: English
- Type: Thesis , Doctoral , PhD (Soil Science)
- Identifier: vital:11962 , http://hdl.handle.net/10353/460 , No-tillage , Soil mechanics , Soils -- Quality , Cover crops , Corn -- Irrigation
- Description: Intensive tillage and monoculture cropping practices reduce soil C accumulation hence increasing soil vulnerability to chemical, physical and biological degradation. This study focussed on enhancing biomass production of wheat and oat winter cover crops as a means of increasing C sequestration in the low organic C soils of the central part of Eastern Cape Province. The specific objectives were (i) to evaluate the short-term effects of no till and cereal-fallow based crop rotations on; soil organic matter related parameters, pH and electrical conductivity, (ii) soil bulk density, water retention and aggregate stability, (iii) soil microbial biomass C and N, mineralizable N, soil respiration, and dehydrogenase enzyme activity, (iv) grain yield, soil nutrient concentration (N, P and K) and their uptake by maize, and (v) to identify soil parameters with high sensitivity to tillage under maize-fallow-maize, maize-wheat-maize and maize-oat-maize rotational cover cropping practices. The experiment was laid out as a split-plot arrangement in a randomized complete block design with 4 replicates. Tillage treatments (CT and NT) were applied on the main plots which measured 8 × 18 m while crop rotation treatments were applied in the subplots which measured 8 × 6 m. The rotation treatments were maize-fallow-maize (MFM), maize-wheat-maize (MWM) and maize-oat-maize (MOM). Weed control in NT plots involved preplant application of glyphosate to control mainly the grass weeds while post emergence weed management was done using Atrazine (485 atrazine and 15 g l-1 triazines). Initial weed control in CT plots was achieved through ploughing to a depth of 20 cm followed by disking while post emergence weed iii management was done by hand hoeing. Soil parameters measured were; (i) particulate organic matter (POM), soil organic carbon (SOC), total nitrogen (TN), pH and electrical conductivity (EC), (ii) soil bulk density (b), moisture at field capacity (FC), aggregate mean weight diameter (MWD) determined by fast wetting (FW), slow wetting (SW), mechanical breakdown by shaking (MB) and the stability index (SI), (iii) soil microbial biomass C (MBC) and N (MBN), mineralizable N (MN), soil respiration (SR), and dehydrogenase enzyme activity (DHEA). No-till increased POM and TN compared to CT in Lenye and Burnshill, respectively. The MWM and the MOM rotations increased TN relative to the MFM rotation in Lenye. The MWM and MOM rotations enhanced SOC relative to MFM in all sampled soil depths at Burnshill and similar observations were made under MOM rotation in the 5-20 cm depth in Lenye. The MWM and MOM rotations tended to depress soil pH relative to the MFM rotation in both sampled soil depths in Lenye while NT reduced soil pH relative to CT on the surface soil layer in Burnshill. Soil EC and pH varied with depth across tillage practices but both parameters remained within the ideal range for successful crop production over the study period. Soil stability index (SI) and aggregate MWD determined by FW, SW and MB were higher in Lenye compared to Burnshill. The MOM rotation enhanced the SI relative to MFM and MWM rotations at both sites. Scanning electron microscope (SEM) showed that more organic C was incorporated into the soil under NT and MOM rotation compared to CT and MFM rotation which had few organic coatings on the soil particles. Microbial properties varied with plant biomass input as influenced by tillage and type of rotational cover crop at both sites. Like in other past studies, NT showed higher levels of MBC, MBN, NM and SR at the soil surface layer compared to CT in Burnshill. No till increased MN iv relative to CT in both sampled soil depths in Lenye and resulted in higher DHEA compared to CT in Burnshill. The MOM rotation increased MBC, MBN, MN relative to MFM rotation especially within surface soil layer. Similar observations were made with respect to MN and SR in both sampled soil layers at Lenye. By contrast, the DHEA was higher under the MFM relative to the MWM and MOM rotations in Lenye but similar under the MFM and MOM rotations in Burnshill. Maize grain yield was not affected by both tillage and crop rotations but varied with cropping season. Comparable grain yields observed under the two tillage practices with similar fertilizer application rates indicated the advantage of NT over CT in saving on labour costs in maize production without compromising yields. High plant biomass retention under NT relative to CT contributed to high soil N and P levels under the former compared to the latter tillage practice especially on soil surface layer at both study sites. Principal component analysis (PCA) revealed that soil chemical and biological parameters closely linked to organic matter, namely SOC, MN, MBC and MBN showed the highest sensitivity to tillage and crop rotation treatments. Soil aggregate MWD determined by SW and b were the physical parameters which were highly altered by agronomic management practice. The MWM and MOM rotations were clustered together and clearly separated from the MFM rotation and this observed trend only applied to the 0-5 and 5-20 cm depths in Lenye site only. No till, MWM and MOM rotations enhanced POM, SOC and TN relative to CT and MFM rotation suggesting these practices have greater potential to improve soil chemical properties compared to intensive tillage and maize monoculture based production practices. Reduced soil b under MOM rotation and improved SI under NT compared to MFM and CT, respectively v indicate that these practices have the potential to improve degraded soils. Although not significantly different, NT values for MBC, MBN, MN, SR and DHEA were higher compared to CT indicating the potential of the practice to improve soil biotic activity relative to conventional tillage practices. No till enhanced surface soil nitrate N and extractable P compared to CT at both sites revealing the long-term potential of NT in improving the supply of these essential plant nutrients compared to CT. Principal component analysis showed that SOC, MN, K, P, MBC, MBN, soil aggregate MWD determined by SW and b were the most sensitive parameters to tillage and crop rotations. Therefore, these parameters could constitute the minimum data set for assessments of the impact of selected CA practices on soil quality attributes.
- Full Text:
- Date Issued: 2010
Transformativity: recognising melancholic power, and renegotiating vulnerability
- Authors: Knowles, Corinne Ruth
- Date: 2010
- Subjects: Transformational leadership -- South Africa Educational change -- South Africa Universities and colleges -- South Africa Sex discrimination in higher education -- South Africa
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2789 , http://hdl.handle.net/10962/d1002999
- Description: South African universities are embedded in an unequal society. Transformation strategies and interventions in the sector attempt to address this, but arguably, the policies and practices which aim to bring about transformation are merely platforms for potential change and do not guarantee the achievement of their aspirations. This study engages with the notion of transformation in one university, looking at how an organisation for women has contributed to transformation in individuals and in the institution. It explores the idea that vulnerability is the starting point of transformation, and must be recognized and incorporated into how an organisation, institution or individual regards vulnerable groups, in order to build a more equitable society. The reframing of vulnerability is a process of acknowledging the way power works, and arguably, power’s melancholic nature and expression in society and in universities has particular challenges with regard to how vulnerable groups experience their vulnerability. If the framing of an individual as vulnerable does not also provide that individual with the conditions that shelter the vulnerability they experience, leading to a renegotiation of whom they can become, their “vulnerable” status is entrenched. The study explores ways in which an organisation for women uses its legitimized platform for renegotiating subjectivities, norms and performances, and the potential this has for transformativity.
- Full Text:
- Date Issued: 2010
- Authors: Knowles, Corinne Ruth
- Date: 2010
- Subjects: Transformational leadership -- South Africa Educational change -- South Africa Universities and colleges -- South Africa Sex discrimination in higher education -- South Africa
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2789 , http://hdl.handle.net/10962/d1002999
- Description: South African universities are embedded in an unequal society. Transformation strategies and interventions in the sector attempt to address this, but arguably, the policies and practices which aim to bring about transformation are merely platforms for potential change and do not guarantee the achievement of their aspirations. This study engages with the notion of transformation in one university, looking at how an organisation for women has contributed to transformation in individuals and in the institution. It explores the idea that vulnerability is the starting point of transformation, and must be recognized and incorporated into how an organisation, institution or individual regards vulnerable groups, in order to build a more equitable society. The reframing of vulnerability is a process of acknowledging the way power works, and arguably, power’s melancholic nature and expression in society and in universities has particular challenges with regard to how vulnerable groups experience their vulnerability. If the framing of an individual as vulnerable does not also provide that individual with the conditions that shelter the vulnerability they experience, leading to a renegotiation of whom they can become, their “vulnerable” status is entrenched. The study explores ways in which an organisation for women uses its legitimized platform for renegotiating subjectivities, norms and performances, and the potential this has for transformativity.
- Full Text:
- Date Issued: 2010
The commercial agricultural economy of the East Cape: Die kommersiële landbou-ekonomie van die Oos-Kaap
- Authors: Antrobus, Geoffrey G
- Date: 2010
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/143079 , vital:38199 , DOI: 10.1080/03031853.1991.9524228
- Description: The East Cape, and in particular the Smaldeel area, is used to exemplify some of the characteristics and problems of commercial farming over a period of about three decades to serve as a backdrop for the broader theme of normalising South African agriculture. The regional economy is dominated by Port Elizabeth-Uitenhage and East London which account for most of the population and three-fourths of the Gross Geographic Product (GGP). Agriculture accounts for only 10% of GGP, but is one of the most labour intensive sectors in a region with 24% of its population unemployed. The agricultural economy of the region is very diversified, but livestock farming plays the most important part in all areas contributing 72% of gross income. The chief changes which have occured in East Cape farming, as elsewhere, have been the decline in the number of farms and increase in farm size, greater capital investment, increased specialisation and declining employment.
- Full Text:
- Date Issued: 2010
- Authors: Antrobus, Geoffrey G
- Date: 2010
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/143079 , vital:38199 , DOI: 10.1080/03031853.1991.9524228
- Description: The East Cape, and in particular the Smaldeel area, is used to exemplify some of the characteristics and problems of commercial farming over a period of about three decades to serve as a backdrop for the broader theme of normalising South African agriculture. The regional economy is dominated by Port Elizabeth-Uitenhage and East London which account for most of the population and three-fourths of the Gross Geographic Product (GGP). Agriculture accounts for only 10% of GGP, but is one of the most labour intensive sectors in a region with 24% of its population unemployed. The agricultural economy of the region is very diversified, but livestock farming plays the most important part in all areas contributing 72% of gross income. The chief changes which have occured in East Cape farming, as elsewhere, have been the decline in the number of farms and increase in farm size, greater capital investment, increased specialisation and declining employment.
- Full Text:
- Date Issued: 2010
An investigation of the African subjectivity represented in Gavin Hood's Tsotsi (2006)
- Authors: Siwak, Jakub
- Date: 2010
- Subjects: Subjectivity in literature , Subjectivity Drama , Violence in motion pictures
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:8391 , http://hdl.handle.net/10948/1093 , Subjectivity in literature , Subjectivity Drama , Violence in motion pictures
- Description: This treatise will focus on a critical examination of Gavin Hood’s South African Oscar-winning film, Tsotsi (2006), in the interest of exploring how the mass media creates a problematic configuration of the subject, in virtue of its valorization of the continued discursive colonization of Africans (identified broadly in geographical rather than racial terms). That is, within the narrative of the film, the protagonist, after engaging in a crime spree, gives himself over to the state authorities and emotively confesses to his transgressions. Importantly, this dramatic confession is represented as a triumph of the human spirit – in the form of an autonomous rehabilitation on the part of the criminal. However, if one understands the protagonist as a subject constituted by what Foucault terms the discursive regimes of disciplinary/bio-power, what emerges into conspicuity is that the protagonist’s actions rather than being the result of his growing maturity and concomitant augmenting ‘humanity’ are the consequence of a set of discursive imperatives which render him docile and prostrate. Arguably, what this serves to represent, and, indeed, propagate, is more of a superimposition of Western cultural discourses on African subjects, and less of a negotiation with such discourses by such subjects. The treatise aims to provide a theoretical solution to the negation of alternative modes of being by disciplinary/bio-power imperatives inextricable from neo-liberal subjectivity. However, in its attempts to encourage cultural negotiation between North and South, the treatise will avoid simplistic, ‘orthodox’, Marxist solutions and will instead critically contend with the theory of Ernesto Laclau and Chantal Mouffe, and their perspectives on how radical democracy can be achieved.
- Full Text:
- Date Issued: 2010
- Authors: Siwak, Jakub
- Date: 2010
- Subjects: Subjectivity in literature , Subjectivity Drama , Violence in motion pictures
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:8391 , http://hdl.handle.net/10948/1093 , Subjectivity in literature , Subjectivity Drama , Violence in motion pictures
- Description: This treatise will focus on a critical examination of Gavin Hood’s South African Oscar-winning film, Tsotsi (2006), in the interest of exploring how the mass media creates a problematic configuration of the subject, in virtue of its valorization of the continued discursive colonization of Africans (identified broadly in geographical rather than racial terms). That is, within the narrative of the film, the protagonist, after engaging in a crime spree, gives himself over to the state authorities and emotively confesses to his transgressions. Importantly, this dramatic confession is represented as a triumph of the human spirit – in the form of an autonomous rehabilitation on the part of the criminal. However, if one understands the protagonist as a subject constituted by what Foucault terms the discursive regimes of disciplinary/bio-power, what emerges into conspicuity is that the protagonist’s actions rather than being the result of his growing maturity and concomitant augmenting ‘humanity’ are the consequence of a set of discursive imperatives which render him docile and prostrate. Arguably, what this serves to represent, and, indeed, propagate, is more of a superimposition of Western cultural discourses on African subjects, and less of a negotiation with such discourses by such subjects. The treatise aims to provide a theoretical solution to the negation of alternative modes of being by disciplinary/bio-power imperatives inextricable from neo-liberal subjectivity. However, in its attempts to encourage cultural negotiation between North and South, the treatise will avoid simplistic, ‘orthodox’, Marxist solutions and will instead critically contend with the theory of Ernesto Laclau and Chantal Mouffe, and their perspectives on how radical democracy can be achieved.
- Full Text:
- Date Issued: 2010
An examination of how organisational policy and news professionalism are negotiated in a newsroom: a case study of Zimbabwe's Financial gazette
- Authors: Gandari, Jonathan
- Date: 2010
- Subjects: Financial gazette Journalism -- Zimbabwe Journalism -- Political aspects -- Zimbabwe Journalistic ethics Journalists -- Zimbabwe Newspapers -- Zimbabwe Mass media -- Political aspects -- Zimbabwe Mass media -- Law and legislation -- Zimbabwe
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3430 , http://hdl.handle.net/10962/d1002884
- Description: The construction of journalistic professionalism in Zimbabwe has stirred debate among scholars. Critics have argued that professionalism has been compromised by the stifling media laws in Zimbabwe as well as the extra legal measures the state has enforced to control the press. Some have also argued that a new kind of journalism must be emerging in the Zimbabwean newsroom as journalism try to cope with the political and economic pressures bedeviling the country. Much of this criticism however, has not been based on close interrogation of professionalism from the perspective of the journalists in any particular newsroom. It is against this background that this study examines the constructions of professionalism at the Financial Gazette. In particular it explores the meaning of professionalism through interrogating the journalistic practices the journalists consider during the process of news production in the context of overwhelming state power. In undertaking this examination, the study draws primarily on qualitative research methods, particularly observation and multi-layered individual in-depth interviews. As the study demonstrates, the interrogation of professionalism from the perspective of newsroom practices uncovers the complex manner in which professionalism is negotiated in the Gazette’s newsroom located in a country undergoing transition in Democracy. The study establishes that when measured against normative canons of journalistic professionalism the Gazette is deviating from such tenets as public service and watchdog journalism. As the study indicates, perhaps unbeknown to the respondents, the ruling ZANU PF party hegemony is reproduced at the Gazette through choice of news values such as sovereignty and patriotism all euphemisms for ruling party‘s slogans.
- Full Text:
- Date Issued: 2010
- Authors: Gandari, Jonathan
- Date: 2010
- Subjects: Financial gazette Journalism -- Zimbabwe Journalism -- Political aspects -- Zimbabwe Journalistic ethics Journalists -- Zimbabwe Newspapers -- Zimbabwe Mass media -- Political aspects -- Zimbabwe Mass media -- Law and legislation -- Zimbabwe
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3430 , http://hdl.handle.net/10962/d1002884
- Description: The construction of journalistic professionalism in Zimbabwe has stirred debate among scholars. Critics have argued that professionalism has been compromised by the stifling media laws in Zimbabwe as well as the extra legal measures the state has enforced to control the press. Some have also argued that a new kind of journalism must be emerging in the Zimbabwean newsroom as journalism try to cope with the political and economic pressures bedeviling the country. Much of this criticism however, has not been based on close interrogation of professionalism from the perspective of the journalists in any particular newsroom. It is against this background that this study examines the constructions of professionalism at the Financial Gazette. In particular it explores the meaning of professionalism through interrogating the journalistic practices the journalists consider during the process of news production in the context of overwhelming state power. In undertaking this examination, the study draws primarily on qualitative research methods, particularly observation and multi-layered individual in-depth interviews. As the study demonstrates, the interrogation of professionalism from the perspective of newsroom practices uncovers the complex manner in which professionalism is negotiated in the Gazette’s newsroom located in a country undergoing transition in Democracy. The study establishes that when measured against normative canons of journalistic professionalism the Gazette is deviating from such tenets as public service and watchdog journalism. As the study indicates, perhaps unbeknown to the respondents, the ruling ZANU PF party hegemony is reproduced at the Gazette through choice of news values such as sovereignty and patriotism all euphemisms for ruling party‘s slogans.
- Full Text:
- Date Issued: 2010
Negotiating sexuality in Grahamstown East: young black women's experiences of relationships in the context of HIV risk
- Authors: Clüver, Frances Rose Mannix
- Date: 2010
- Subjects: HIV infections -- South Africa -- Grahamstown Man-woman relationships -- South Africa -- Grahamstown Intimacy -- South Africa -- Grahamstown Sex -- South Africa -- Grahamstown Youth, Black -- South Africa -- Grahamstown -- Sexual behavior HIV infections -- Social aspects -- South Africa -- Grahamstown Youth, Black -- South Africa -- Grahamstown -- Attitudes Reproductive health -- South Africa -- Grahamstown Health education -- South Africa -- Grahamstown Youth, Black -- South Africa -- Grahamstown -- Health and hygiene Phenomenological psychology
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2951 , http://hdl.handle.net/10962/d1002460
- Description: Adolescent sexual health has been identified as a significant health and development problem facing South Africa. Limited amounts of research on sexual interactions have been undertaken, with information on adolescents’ romantic relationships being particularly scarce. Qualitative research needs to foster an understanding of the dynamics of sexual interactions in specific settings, and with emphasis in the past on cognitive health psychology models, very little is thus known about how adolescents negotiate and make sense of their sexual experiences. This highlights the need to investigate the complexities of human sexuality in a contextual manner. In response, this study explores the lived experiences of four young black women as they negotiate their agency and sexuality in a local context. By way of in-depth qualitative interviews, which were analysed for recurrent themes using interpretative phenomenological analysis, this project examines the participants’ experiences regarding sex, relationships, communication, sexual health care, as well as HIV and pregnancy prevention. The results reveal that communication about sexuality in the participants’ homes was limited if not absent altogether. When seeking sexual health care, they found clinic nurses to be judgemental and rude. Regarding sexuality and HIV education, the participants stressed the need for outside educators to teach in more practical ways to increase efficacy. In their dating relationships, most participants revealed their boyfriends had a great deal of influence over their sexual initiation. Unwanted pregnancy surfaced as a greater fear than HIV in their accounts due to pressure to finish their education and attain well-paying jobs in the future. The participants felt unable to stop their boyfriends’ infidelity and had limited agency when facing sexual demands. Their accounts revealed that they negotiate their agency in an atmosphere of coercion and the threat of rape. However, areas of agency included their consistent condom use even when facing pressure to have unprotected sex, and their active accessing of sexual health services for hormonal contraception. These insights serve to better inform sexual and reproductive health education and intervention programmes for young women. Moreover, educators, researchers and programme developers alike may gain useful insights from the personalised accounts derived from this study.
- Full Text:
- Date Issued: 2010
- Authors: Clüver, Frances Rose Mannix
- Date: 2010
- Subjects: HIV infections -- South Africa -- Grahamstown Man-woman relationships -- South Africa -- Grahamstown Intimacy -- South Africa -- Grahamstown Sex -- South Africa -- Grahamstown Youth, Black -- South Africa -- Grahamstown -- Sexual behavior HIV infections -- Social aspects -- South Africa -- Grahamstown Youth, Black -- South Africa -- Grahamstown -- Attitudes Reproductive health -- South Africa -- Grahamstown Health education -- South Africa -- Grahamstown Youth, Black -- South Africa -- Grahamstown -- Health and hygiene Phenomenological psychology
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2951 , http://hdl.handle.net/10962/d1002460
- Description: Adolescent sexual health has been identified as a significant health and development problem facing South Africa. Limited amounts of research on sexual interactions have been undertaken, with information on adolescents’ romantic relationships being particularly scarce. Qualitative research needs to foster an understanding of the dynamics of sexual interactions in specific settings, and with emphasis in the past on cognitive health psychology models, very little is thus known about how adolescents negotiate and make sense of their sexual experiences. This highlights the need to investigate the complexities of human sexuality in a contextual manner. In response, this study explores the lived experiences of four young black women as they negotiate their agency and sexuality in a local context. By way of in-depth qualitative interviews, which were analysed for recurrent themes using interpretative phenomenological analysis, this project examines the participants’ experiences regarding sex, relationships, communication, sexual health care, as well as HIV and pregnancy prevention. The results reveal that communication about sexuality in the participants’ homes was limited if not absent altogether. When seeking sexual health care, they found clinic nurses to be judgemental and rude. Regarding sexuality and HIV education, the participants stressed the need for outside educators to teach in more practical ways to increase efficacy. In their dating relationships, most participants revealed their boyfriends had a great deal of influence over their sexual initiation. Unwanted pregnancy surfaced as a greater fear than HIV in their accounts due to pressure to finish their education and attain well-paying jobs in the future. The participants felt unable to stop their boyfriends’ infidelity and had limited agency when facing sexual demands. Their accounts revealed that they negotiate their agency in an atmosphere of coercion and the threat of rape. However, areas of agency included their consistent condom use even when facing pressure to have unprotected sex, and their active accessing of sexual health services for hormonal contraception. These insights serve to better inform sexual and reproductive health education and intervention programmes for young women. Moreover, educators, researchers and programme developers alike may gain useful insights from the personalised accounts derived from this study.
- Full Text:
- Date Issued: 2010
Control and authenticity: reflections on personal autonomy
- Authors: Paphitis, Sharli Anne
- Date: 2010
- Subjects: Frankfurt, Harry G., 1929- -- Criticism and interpretation Nietzsche, Friedrich Wilhelm, 1844-1900 -- Criticism and interpretation Watson, Gary, 1943- -- Criticism and interpretation Self-control Authenticity (Philosophy) Autonomy (Philosophy) Self (Philosophy)
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2717 , http://hdl.handle.net/10962/d1002847
- Description: Currently the most influential accounts of personal autonomy, at least in the Englishspeaking world, focus on providing conditions under which agents can be said to exercise self-control. Two distinct accounts of personal autonomy have emerged in this tradition: firstly, hierarchical models grounded in the work of Harry Frankfurt; and secondly, systems division models most famously articulated by Gary Watson. In this thesis I show the inadequacies of both of these models by exploring the problematic views of the self and self-control underlying each model. I will suggest that the problems faced by these models stem from the fact that they endorse a problematic fragmentation of the self. I suggest that a Nietzschean account of personal autonomy is able to avoid these problems. The Nietzschean account can largely, I show, be drawn from Nietzsche’s understanding of both the ‘man of ressentiment’ and his opposite, the sovereign individual. On this picture wholeness of self – rather than fragmentation of the self – is required in order for us to be most fully autonomous. Furthermore, this wholeness of self requires the kind of integrity which is opposed to the problematic fragmentation endorsed by Frankfurt and Watson.
- Full Text:
- Date Issued: 2010
- Authors: Paphitis, Sharli Anne
- Date: 2010
- Subjects: Frankfurt, Harry G., 1929- -- Criticism and interpretation Nietzsche, Friedrich Wilhelm, 1844-1900 -- Criticism and interpretation Watson, Gary, 1943- -- Criticism and interpretation Self-control Authenticity (Philosophy) Autonomy (Philosophy) Self (Philosophy)
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2717 , http://hdl.handle.net/10962/d1002847
- Description: Currently the most influential accounts of personal autonomy, at least in the Englishspeaking world, focus on providing conditions under which agents can be said to exercise self-control. Two distinct accounts of personal autonomy have emerged in this tradition: firstly, hierarchical models grounded in the work of Harry Frankfurt; and secondly, systems division models most famously articulated by Gary Watson. In this thesis I show the inadequacies of both of these models by exploring the problematic views of the self and self-control underlying each model. I will suggest that the problems faced by these models stem from the fact that they endorse a problematic fragmentation of the self. I suggest that a Nietzschean account of personal autonomy is able to avoid these problems. The Nietzschean account can largely, I show, be drawn from Nietzsche’s understanding of both the ‘man of ressentiment’ and his opposite, the sovereign individual. On this picture wholeness of self – rather than fragmentation of the self – is required in order for us to be most fully autonomous. Furthermore, this wholeness of self requires the kind of integrity which is opposed to the problematic fragmentation endorsed by Frankfurt and Watson.
- Full Text:
- Date Issued: 2010
Attraction and retention of non-family business employees
- Authors: Van Zyl, Jacques
- Date: 2010
- Subjects: Family-owned business enterprises , Employee retention
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: vital:8653 , http://hdl.handle.net/10948/1365 , Family-owned business enterprises , Employee retention
- Description: The purpose of this research treatise was to identify specific aspects related to employees in a non-family owned business that can be adopted by family owned businesses in order to attract, attain and motivate non-family employees. The focus of the researched aspect was based on seven categories of business management, namely; governance, policies and procedures, direction and planning, leadership, employee development, rewards and other general related characteristics. The research commenced with a literature review, which centered on background information pertaining to family owned businesses and specific aspects related to organisation and management thereof. It was assessed that very few completed research papers exit that addressed the topic as indicated above. The research focussed on a medium sized, non-family owned business within the consulting engineering industry. The physical research consisted of a questionnaire distributed to all of the employees of the particular firm. The questionnaire was made up of two sections. The first was a typical Likert scale type and the second, open ended questions. The questions of both question sets were categorised in specific business control and management topics, namely: - Governance; - Policies and procedures; - Direction and planning; - Leadership; - Employee development; - Rewards; and, - General aspects. The primary objective of this study was to identify and explore the factors that are regarded to be important by unrelated employees in work environment, specifically focusing on attaining, retaining and motivating aspects. The study found that the average employee prefers to have desire for formal management structures and see succession planning not only as an important sustainable business strategy, but also as an underlying motivation principle. Also identified were the partialities towards formal employee management systems, employee development, and the value of monetary rewards.
- Full Text:
- Date Issued: 2010
- Authors: Van Zyl, Jacques
- Date: 2010
- Subjects: Family-owned business enterprises , Employee retention
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: vital:8653 , http://hdl.handle.net/10948/1365 , Family-owned business enterprises , Employee retention
- Description: The purpose of this research treatise was to identify specific aspects related to employees in a non-family owned business that can be adopted by family owned businesses in order to attract, attain and motivate non-family employees. The focus of the researched aspect was based on seven categories of business management, namely; governance, policies and procedures, direction and planning, leadership, employee development, rewards and other general related characteristics. The research commenced with a literature review, which centered on background information pertaining to family owned businesses and specific aspects related to organisation and management thereof. It was assessed that very few completed research papers exit that addressed the topic as indicated above. The research focussed on a medium sized, non-family owned business within the consulting engineering industry. The physical research consisted of a questionnaire distributed to all of the employees of the particular firm. The questionnaire was made up of two sections. The first was a typical Likert scale type and the second, open ended questions. The questions of both question sets were categorised in specific business control and management topics, namely: - Governance; - Policies and procedures; - Direction and planning; - Leadership; - Employee development; - Rewards; and, - General aspects. The primary objective of this study was to identify and explore the factors that are regarded to be important by unrelated employees in work environment, specifically focusing on attaining, retaining and motivating aspects. The study found that the average employee prefers to have desire for formal management structures and see succession planning not only as an important sustainable business strategy, but also as an underlying motivation principle. Also identified were the partialities towards formal employee management systems, employee development, and the value of monetary rewards.
- Full Text:
- Date Issued: 2010
Fostering information security culture through intergrating theory and technology
- Van Niekerk, Johannes Frederick
- Authors: Van Niekerk, Johannes Frederick
- Date: 2010
- Subjects: Information technology -- Security measures , Data protection , Corporate culture -- South Africa
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:9754 , http://hdl.handle.net/10948/1404 , Information technology -- Security measures , Data protection , Corporate culture -- South Africa
- Description: Today information can be seen as a basic commodity that is crucial to the continuous well-being of modern organizations. Many modern organizations will be unable to do business without access to their information resources. It is therefor of vital importance for organizations to ensure that their infor- mation resources are adequately protected against both internal and external threats. This protection of information resources is known as information security and is, to a large extent, dependent on the behavior of humans in the organization. Humans, at various levels in the organization, play vital roles in the pro- cesses that secure organizational information resources. Many of the prob- lems experienced in information security can be directly contributed to the humans involved in the process. Employees, either intentionally or through negligence, often due to a lack of knowledge, can be seen as the greatest threat to information security. Addressing this human factor in information security is the primary focus of this thesis. The majority of current approaches to dealing with the human factors in information security acknowledge the need to foster an information security culture in the organization. However, very few current approaches attempt to adjust the "generic" model(s) used to define organizational culture to be specific to the needs of information security. This thesis firstly proposes, and argues, such an adapted conceptual model which aims to improve the understanding of what an information security culture is. The thesis secondly focuses on the underlying role that information security educational programs play in the fostering of an organizational information security culture. It is argued that many current information security edu- cational programs are not based on sound pedagogical theory. The use of learning taxonomies during the design of information security educational programs is proposed as a possible way to improve the pedagogical rigor of such programs. The thesis also argues in favor of the use of blended and/or e-learning approaches for the delivery of information security educational content. Finally, this thesis provides a detailed overview demonstrating how the various elements contributed by the thesis integrates into existing trans- formative change management processes for the fostering of an organizational information security culture.
- Full Text:
- Date Issued: 2010
- Authors: Van Niekerk, Johannes Frederick
- Date: 2010
- Subjects: Information technology -- Security measures , Data protection , Corporate culture -- South Africa
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:9754 , http://hdl.handle.net/10948/1404 , Information technology -- Security measures , Data protection , Corporate culture -- South Africa
- Description: Today information can be seen as a basic commodity that is crucial to the continuous well-being of modern organizations. Many modern organizations will be unable to do business without access to their information resources. It is therefor of vital importance for organizations to ensure that their infor- mation resources are adequately protected against both internal and external threats. This protection of information resources is known as information security and is, to a large extent, dependent on the behavior of humans in the organization. Humans, at various levels in the organization, play vital roles in the pro- cesses that secure organizational information resources. Many of the prob- lems experienced in information security can be directly contributed to the humans involved in the process. Employees, either intentionally or through negligence, often due to a lack of knowledge, can be seen as the greatest threat to information security. Addressing this human factor in information security is the primary focus of this thesis. The majority of current approaches to dealing with the human factors in information security acknowledge the need to foster an information security culture in the organization. However, very few current approaches attempt to adjust the "generic" model(s) used to define organizational culture to be specific to the needs of information security. This thesis firstly proposes, and argues, such an adapted conceptual model which aims to improve the understanding of what an information security culture is. The thesis secondly focuses on the underlying role that information security educational programs play in the fostering of an organizational information security culture. It is argued that many current information security edu- cational programs are not based on sound pedagogical theory. The use of learning taxonomies during the design of information security educational programs is proposed as a possible way to improve the pedagogical rigor of such programs. The thesis also argues in favor of the use of blended and/or e-learning approaches for the delivery of information security educational content. Finally, this thesis provides a detailed overview demonstrating how the various elements contributed by the thesis integrates into existing trans- formative change management processes for the fostering of an organizational information security culture.
- Full Text:
- Date Issued: 2010
An investigation into the feasibility of incorporating didanosine into innovative solid lipid nanocarriers
- Authors: Wa Kasongo, Kasongo
- Date: 2010
- Subjects: Antiretroviral agents HIV infections -- Drug testing Didanosine Nanoparticles Drug delivery systems Nanostructured materials Lipids -- Therapeutic use
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:3800 , http://hdl.handle.net/10962/d1003278
- Description: The research undertaken in these studies aimed to investigate the feasibility of developing and manufacturing innovative solid lipid carriers, such as solid lipid nanoparticles (SLN) and/or nanostructured lipid carriers (NLC) using a hot high pressure homogenization method, for didanosine(DDI). In addition, studies using in vitro differential protein adsorption were undertaken to establish whether the SLN and/or NLC have the potential to deliver DDI to the central nervous system (CNS). Prior to initiating pre-formulation, formulation development and optimization studies of DDI-Ioaded SLN and/or NLC, it was necessary to develop and validate an analytical method for the in vitro quantitation and analysis of DDI. An accurate, precise and sensitive RP-HPLC method with UV detection set at 248 nm was developed, optimized and validated for the quantitative in vitro analysis of DDI in formulations. Pre-formulation studies were designed to evaluate the thermal stability of DDI and to select and characterize lipid excipients that may be used for the manufacture of the nanocarriers. It was established that DDI is thermostable at temperatures not exceeding 163°C and therefore a hot high pressure homogenization technique could be used to manufacture DDI-loaded SLN and/or NLC. Lipid screening studies revealed that DDI is poorly soluble in both solid and liquid lipids. A combination of Precirol® ATO 5 and Transcutol® HP was found to have the best solubilizing-potential for DDI of all lipids investigated. The inclusion of Transcutol® HP into Precirol® ATO 5 changed the polymorphic form of the solid lipid from the stable 13-modification to a material that exhibited the co-existence between α- and β-polymorphic forms. The relatively high solubility of DDI in Transcutol® HP compared to Precirol® ATO 5 was an indication that a solid lipid matrix prepared from a binary mixture of Precirol® ATO 5 and Transcutol® HP was likely to have a higher loading capacity and encapsulation efficiency for DDI than a matrix consisting of Precirol® ATO 5 alone. Furthermore, the potential for the solid lipid matrix to exist in the α- and/or β-modifications when Transcutol® HP was added to Precirol® ATO 5 suggested that expulsion of DDI from a solid lipid matrix during prolonged storage periods was likely to be minimal. Therefore it was considered logical to investigate the feasibility of incorporating DDI into NLC and not in SLN. However, due to the limited solubility of DDI in lipids, formulation development of DDI-loaded NLC commenced using small quantities of DDI. Formulation development and optimization studies of DDI-loaded NLC were initially aimed at selecting a surfactant system that was capable of stabilizing NLC in an aqueous environment. Solutol® HS alone or a ternary mixture consisting of Solutol® HS, Tween® 80 and Lutrol® F68 was found to stabilize the nanoparticles in terms of particle size and the polydispersity index. The use of the ternary mixture as the surfactant system was preferred to using Solutol® HS alone as Lutrol® F68 and especially Tween® 80 have been successfully used to target the delivery of API to the brain. Aqueous DDI-free and DDI-Ioaded NLC containing increasing amounts of DDI were manufactured using hot high pressure homogenization at 800 bar for three cycles. The NLC formulations were characterized in terms of particle size, polydispersity index, zeta potential, and polymorphism, degree of crystallinity, encapsulation efficiency (EE), shape and surface morphology. The mean particle size for all formulations was below 250 nm with narrow polydispersity indices, indicating that narrow particle size distribution had been achieved. The d99% values for all formulations tested, were generated using laser diffractometry, and were below 400 nm, with span values ranging from 0.84 - 1.19 also suggesting that a narrow particle size distribution had been achieved. The zeta potential values measured in double distilled water with the conductivity adjusted to 50 μS/cm ranged from -18.4 to -11.4 mV. In addition, all the formulations showed a decrease in the degree of crystallinity as compared to the bulk lipid material and WAXS shows that the formulations existed in a single β-modification form. Furthermore DDI that had been incorporated into the NLC appeared to be molecularly dispersed in the lipid matrices. These parameters remained unaffected for most formulations following storage for two months at 25°C. In addition these formulations contained a mixture of spherical and non-spherical particles irrespective of the amount of DDI that was added during the manufacture of the formulations. These studies showed that it was feasible to develop and incorporate small amounts of DDI into NLC. However in order to use these delivery systems for oral administration of DDI to paediatric patients, strategies to improve the amount of DDI that could be loaded into the particles and to achieve high encapsulation efficiencies had to be developed. The limited solubility of DDI in lipid media was identified as a major factor that affected the loading capacity and encapsulation efficiency of DDI in the NLC. Therefore, a novel strategy aimed at increasing the saturation solubility of DDI in the lipid by attempting to increase the dissolution velocity of the drug in the lipid using a particle size reduction approach, was designed and investigated. DDI was dispersed in Transcutol® HP and the particle size of DDI in the liquid lipid medium was reduced gradually using hot high pressure homogenization and the product obtained from these studies was used to manufacture DDI-loaded NLC using a cold high pressure homogenization procedure. Although the encapsulation efficiency and drug loading following use of this approach was relatively high, the particles were large and showed a tendency to grow in size leading to the formation of microparticles after storage for two months at 25°C. In addition, the degree of crystallinity of the nanoparticles increased rapidly over the same storage period which led to expulsion of DDI nanoparticles for the NLC, despite the DDI loading in NLC being unaffected. It was clearly evident that this new approach of manufacturing solid lipid nanocarriers could be used as a platform not only for enhancing the loading capacity of DDI in solid lipid nanocarriers but also for other hydrophilic drugs. Differential protein adsorption patterns of DDI-loaded NLC were generated in vitro using two-dimensional polyacrylamide gel electrophoresis (2-D PAGE) in order to establish the potential for these systems to deliver DDI to the CNS. NLC formulations containing small amounts of DDI were used as these formulations showed a better stability profile than the formulation with a higher encapsulation efficiency and drug loading capacity. Furthermore, the encapsulation efficiency and drug loading of DDI were considered sufficient for use in 2-D PAGE studies. Data obtained from 2-D PAGE analysis reveal that DDI-loaded NLC preferentially adsorb proteins in vitro that are responsible for specific brain targeting in vivo. More importantly, these studies reveal that in addition to Tween® 80 that has already been shown to have the potential to target CDDS to the brain, Solutol® HS 15 has the potential to achieve a similar objective. Consequently, DDI-loaded NLC have the potential to deliver DDI to the brain and these results may be used as a platform for conducting in vivo studies to establish whether DDI can cross the blood brain barrier and enter the CNS when administered in NLC which may in turn lead to a major breakthrough in the management of HIV/AIDS and Aids Dementia Complex (ADC).
- Full Text:
- Date Issued: 2010
- Authors: Wa Kasongo, Kasongo
- Date: 2010
- Subjects: Antiretroviral agents HIV infections -- Drug testing Didanosine Nanoparticles Drug delivery systems Nanostructured materials Lipids -- Therapeutic use
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:3800 , http://hdl.handle.net/10962/d1003278
- Description: The research undertaken in these studies aimed to investigate the feasibility of developing and manufacturing innovative solid lipid carriers, such as solid lipid nanoparticles (SLN) and/or nanostructured lipid carriers (NLC) using a hot high pressure homogenization method, for didanosine(DDI). In addition, studies using in vitro differential protein adsorption were undertaken to establish whether the SLN and/or NLC have the potential to deliver DDI to the central nervous system (CNS). Prior to initiating pre-formulation, formulation development and optimization studies of DDI-Ioaded SLN and/or NLC, it was necessary to develop and validate an analytical method for the in vitro quantitation and analysis of DDI. An accurate, precise and sensitive RP-HPLC method with UV detection set at 248 nm was developed, optimized and validated for the quantitative in vitro analysis of DDI in formulations. Pre-formulation studies were designed to evaluate the thermal stability of DDI and to select and characterize lipid excipients that may be used for the manufacture of the nanocarriers. It was established that DDI is thermostable at temperatures not exceeding 163°C and therefore a hot high pressure homogenization technique could be used to manufacture DDI-loaded SLN and/or NLC. Lipid screening studies revealed that DDI is poorly soluble in both solid and liquid lipids. A combination of Precirol® ATO 5 and Transcutol® HP was found to have the best solubilizing-potential for DDI of all lipids investigated. The inclusion of Transcutol® HP into Precirol® ATO 5 changed the polymorphic form of the solid lipid from the stable 13-modification to a material that exhibited the co-existence between α- and β-polymorphic forms. The relatively high solubility of DDI in Transcutol® HP compared to Precirol® ATO 5 was an indication that a solid lipid matrix prepared from a binary mixture of Precirol® ATO 5 and Transcutol® HP was likely to have a higher loading capacity and encapsulation efficiency for DDI than a matrix consisting of Precirol® ATO 5 alone. Furthermore, the potential for the solid lipid matrix to exist in the α- and/or β-modifications when Transcutol® HP was added to Precirol® ATO 5 suggested that expulsion of DDI from a solid lipid matrix during prolonged storage periods was likely to be minimal. Therefore it was considered logical to investigate the feasibility of incorporating DDI into NLC and not in SLN. However, due to the limited solubility of DDI in lipids, formulation development of DDI-loaded NLC commenced using small quantities of DDI. Formulation development and optimization studies of DDI-loaded NLC were initially aimed at selecting a surfactant system that was capable of stabilizing NLC in an aqueous environment. Solutol® HS alone or a ternary mixture consisting of Solutol® HS, Tween® 80 and Lutrol® F68 was found to stabilize the nanoparticles in terms of particle size and the polydispersity index. The use of the ternary mixture as the surfactant system was preferred to using Solutol® HS alone as Lutrol® F68 and especially Tween® 80 have been successfully used to target the delivery of API to the brain. Aqueous DDI-free and DDI-Ioaded NLC containing increasing amounts of DDI were manufactured using hot high pressure homogenization at 800 bar for three cycles. The NLC formulations were characterized in terms of particle size, polydispersity index, zeta potential, and polymorphism, degree of crystallinity, encapsulation efficiency (EE), shape and surface morphology. The mean particle size for all formulations was below 250 nm with narrow polydispersity indices, indicating that narrow particle size distribution had been achieved. The d99% values for all formulations tested, were generated using laser diffractometry, and were below 400 nm, with span values ranging from 0.84 - 1.19 also suggesting that a narrow particle size distribution had been achieved. The zeta potential values measured in double distilled water with the conductivity adjusted to 50 μS/cm ranged from -18.4 to -11.4 mV. In addition, all the formulations showed a decrease in the degree of crystallinity as compared to the bulk lipid material and WAXS shows that the formulations existed in a single β-modification form. Furthermore DDI that had been incorporated into the NLC appeared to be molecularly dispersed in the lipid matrices. These parameters remained unaffected for most formulations following storage for two months at 25°C. In addition these formulations contained a mixture of spherical and non-spherical particles irrespective of the amount of DDI that was added during the manufacture of the formulations. These studies showed that it was feasible to develop and incorporate small amounts of DDI into NLC. However in order to use these delivery systems for oral administration of DDI to paediatric patients, strategies to improve the amount of DDI that could be loaded into the particles and to achieve high encapsulation efficiencies had to be developed. The limited solubility of DDI in lipid media was identified as a major factor that affected the loading capacity and encapsulation efficiency of DDI in the NLC. Therefore, a novel strategy aimed at increasing the saturation solubility of DDI in the lipid by attempting to increase the dissolution velocity of the drug in the lipid using a particle size reduction approach, was designed and investigated. DDI was dispersed in Transcutol® HP and the particle size of DDI in the liquid lipid medium was reduced gradually using hot high pressure homogenization and the product obtained from these studies was used to manufacture DDI-loaded NLC using a cold high pressure homogenization procedure. Although the encapsulation efficiency and drug loading following use of this approach was relatively high, the particles were large and showed a tendency to grow in size leading to the formation of microparticles after storage for two months at 25°C. In addition, the degree of crystallinity of the nanoparticles increased rapidly over the same storage period which led to expulsion of DDI nanoparticles for the NLC, despite the DDI loading in NLC being unaffected. It was clearly evident that this new approach of manufacturing solid lipid nanocarriers could be used as a platform not only for enhancing the loading capacity of DDI in solid lipid nanocarriers but also for other hydrophilic drugs. Differential protein adsorption patterns of DDI-loaded NLC were generated in vitro using two-dimensional polyacrylamide gel electrophoresis (2-D PAGE) in order to establish the potential for these systems to deliver DDI to the CNS. NLC formulations containing small amounts of DDI were used as these formulations showed a better stability profile than the formulation with a higher encapsulation efficiency and drug loading capacity. Furthermore, the encapsulation efficiency and drug loading of DDI were considered sufficient for use in 2-D PAGE studies. Data obtained from 2-D PAGE analysis reveal that DDI-loaded NLC preferentially adsorb proteins in vitro that are responsible for specific brain targeting in vivo. More importantly, these studies reveal that in addition to Tween® 80 that has already been shown to have the potential to target CDDS to the brain, Solutol® HS 15 has the potential to achieve a similar objective. Consequently, DDI-loaded NLC have the potential to deliver DDI to the brain and these results may be used as a platform for conducting in vivo studies to establish whether DDI can cross the blood brain barrier and enter the CNS when administered in NLC which may in turn lead to a major breakthrough in the management of HIV/AIDS and Aids Dementia Complex (ADC).
- Full Text:
- Date Issued: 2010