The experience of instant messaging upon adolescent female relationship
- Authors: Eberhardt, Antoinette
- Date: 2010
- Subjects: Adolescent psychology -- South Africa , Instant messaging -- South Africa , Friendship in adolescence -- South Africa , Teenage girls -- Social networks , Social networks -- Psychological aspects
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:9877 , http://hdl.handle.net/10948/1324 , Adolescent psychology -- South Africa , Instant messaging -- South Africa , Friendship in adolescence -- South Africa , Teenage girls -- Social networks , Social networks -- Psychological aspects
- Description: Social Interaction Technologies (SIT) have broadened the horizon of communication in terms of the way people are able to communicate. It is now possible to interact with others across the world and engage in numerous activities ranging from dating to political movements, hobbies and even professions (Chigona, Chigona, Ngqokelela, & Mpofu, 2009). Adolescents and pre-adolescents especially are inclined to make use of SIT in their social lives with the most popular mode of communication, apart from email, being instant messaging (IM) (Brown, Mounts, Lamborn, & Steinberg, 1993; Bryant, Sanders-Jackson, & Smallwood, 2006; Madden & Rainie, 2003). Adolescents tend to use IM regularly as a tool to maintain relationships and girls especially, use it as a tool to socialise (Jennings & Wartella, 2004; Lenhart, Rainie, & Lewis, 2001). The mobile phone or cell phone, which is another example of an SIT-based communication, has become an established medium of technical, social and commercial communication in South Africa. It has given rise to the development and vast growth of a mobile youth culture who consider it an essential tool for communicating (Bosch, 2008). In South Africa, instant messages may be sent via mobile phone using one of two methods: MXit and the SMS (short messaging service). MXit and the SMS are considered convenient tools of communication as an ongoing conversation in the form of a text message may be maintained in the present (Yoshii, Matsuda, Habuchi, Dobashi, Iwata, & Kin, 2002).
- Full Text:
- Date Issued: 2010
- Authors: Eberhardt, Antoinette
- Date: 2010
- Subjects: Adolescent psychology -- South Africa , Instant messaging -- South Africa , Friendship in adolescence -- South Africa , Teenage girls -- Social networks , Social networks -- Psychological aspects
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:9877 , http://hdl.handle.net/10948/1324 , Adolescent psychology -- South Africa , Instant messaging -- South Africa , Friendship in adolescence -- South Africa , Teenage girls -- Social networks , Social networks -- Psychological aspects
- Description: Social Interaction Technologies (SIT) have broadened the horizon of communication in terms of the way people are able to communicate. It is now possible to interact with others across the world and engage in numerous activities ranging from dating to political movements, hobbies and even professions (Chigona, Chigona, Ngqokelela, & Mpofu, 2009). Adolescents and pre-adolescents especially are inclined to make use of SIT in their social lives with the most popular mode of communication, apart from email, being instant messaging (IM) (Brown, Mounts, Lamborn, & Steinberg, 1993; Bryant, Sanders-Jackson, & Smallwood, 2006; Madden & Rainie, 2003). Adolescents tend to use IM regularly as a tool to maintain relationships and girls especially, use it as a tool to socialise (Jennings & Wartella, 2004; Lenhart, Rainie, & Lewis, 2001). The mobile phone or cell phone, which is another example of an SIT-based communication, has become an established medium of technical, social and commercial communication in South Africa. It has given rise to the development and vast growth of a mobile youth culture who consider it an essential tool for communicating (Bosch, 2008). In South Africa, instant messages may be sent via mobile phone using one of two methods: MXit and the SMS (short messaging service). MXit and the SMS are considered convenient tools of communication as an ongoing conversation in the form of a text message may be maintained in the present (Yoshii, Matsuda, Habuchi, Dobashi, Iwata, & Kin, 2002).
- Full Text:
- Date Issued: 2010
Mobile phones interaction techniques for second economy people
- Authors: Edim, Azom Emmanuel
- Date: 2010
- Subjects: Rural development projects -- South Africa -- Eastern Cape , Poverty -- South Africa -- Eastern Cape , Cell phone systems -- South Africa -- Eastern Cape , User interfaces (Computer systems) , Human-computer interaction , Community development -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Doctoral , PhD (Computer Science)
- Identifier: vital:11392 , http://hdl.handle.net/10353/519 , Rural development projects -- South Africa -- Eastern Cape , Poverty -- South Africa -- Eastern Cape , Cell phone systems -- South Africa -- Eastern Cape , User interfaces (Computer systems) , Human-computer interaction , Community development -- South Africa -- Eastern Cape
- Description: Second economy people in developing countries are people living in communities that are underserved in terms of basic amenities and social services. Due to literacy challenges and user accessibility problems in rural communities, it is often difficult to design user interfaces that conform to the capabilities and cultural experiences of low-literacy rural community users. Rural community users are technologically illiterate and lack the knowledge of the potential of information and communication technologies. In order to embrace new technology, users will need to perceive the user interface and application as useful and easy to interact with. This requires proper understanding of the users and their socio-cultural environment. This will enable the interfaces and interactions to conform to their behaviours, motivations as well as cultural experiences and preferences and thus enhance usability and user experience. Mobile phones have the potential to increase access to information and provide a platform for economic development in rural communities. Rural communities have economic potential in terms of agriculture and micro-enterprises. Information technology can be used to enhance socio-economic activities and improve rural livelihood. We conducted a study to design user interfaces for a mobile commerce application for micro-entrepreneurs in a rural community in South Africa. The aim of the study was to design mobile interfaces and interaction techniques that are easy to use and meet the cultural preferences and experiences of users who have little to no previous experience of mobile commerce technology. And also to explore the potentials of information technologies rural community users, and bring mobile added value services to rural micro-entrepreneurs. We applied a user-centred design approach in Dwesa community and used qualitative and quantitative research methods to collect data for the design of the user interfaces (graphic user interface and voice user interface) and mobile commerce application. We identified and used several interface elements to design and finally evaluate the graphical user interface. The statistics analysis of the evaluation results show that the users in the community have positive perception of the usefulness of the application, the ease of use and intention to use the application. Community users with no prior experience with this technology were able to learn and understand the interface, recorded minimum errors and a high level of v precision during task performance when they interacted with the shop-owner graphic user interface. The voice user interface designed in this study consists of two flavours (dual tone multi-frequency input and voice input) for rural users. The evaluation results show that community users recorded higher tasks successes and minimum errors with the dual tone multi-frequency input interface than the voice only input interface. Also, a higher percentage of users prefer the dual tone multi-frequency input interface. The t-Test statistical analysis performed on the tasks completion times and error rate show that there was significant statistical difference between the dual tone multi-frequency input interface and the voice input interface. The interfaces were easy to learn, understand and use. Properly designed user interfaces that meet the experience and capabilities of low-literacy users in rural areas will improve usability and users‟ experiences. Adaptation of interfaces to users‟ culture and preferences will enhance information services accessibility among different user groups in different regions. This will promote technology acceptance in rural communities for socio-economic benefits. The user interfaces presented in this study can be adapted to different cultures to provide similar services for marginalised communities in developing countries
- Full Text:
- Date Issued: 2010
- Authors: Edim, Azom Emmanuel
- Date: 2010
- Subjects: Rural development projects -- South Africa -- Eastern Cape , Poverty -- South Africa -- Eastern Cape , Cell phone systems -- South Africa -- Eastern Cape , User interfaces (Computer systems) , Human-computer interaction , Community development -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Doctoral , PhD (Computer Science)
- Identifier: vital:11392 , http://hdl.handle.net/10353/519 , Rural development projects -- South Africa -- Eastern Cape , Poverty -- South Africa -- Eastern Cape , Cell phone systems -- South Africa -- Eastern Cape , User interfaces (Computer systems) , Human-computer interaction , Community development -- South Africa -- Eastern Cape
- Description: Second economy people in developing countries are people living in communities that are underserved in terms of basic amenities and social services. Due to literacy challenges and user accessibility problems in rural communities, it is often difficult to design user interfaces that conform to the capabilities and cultural experiences of low-literacy rural community users. Rural community users are technologically illiterate and lack the knowledge of the potential of information and communication technologies. In order to embrace new technology, users will need to perceive the user interface and application as useful and easy to interact with. This requires proper understanding of the users and their socio-cultural environment. This will enable the interfaces and interactions to conform to their behaviours, motivations as well as cultural experiences and preferences and thus enhance usability and user experience. Mobile phones have the potential to increase access to information and provide a platform for economic development in rural communities. Rural communities have economic potential in terms of agriculture and micro-enterprises. Information technology can be used to enhance socio-economic activities and improve rural livelihood. We conducted a study to design user interfaces for a mobile commerce application for micro-entrepreneurs in a rural community in South Africa. The aim of the study was to design mobile interfaces and interaction techniques that are easy to use and meet the cultural preferences and experiences of users who have little to no previous experience of mobile commerce technology. And also to explore the potentials of information technologies rural community users, and bring mobile added value services to rural micro-entrepreneurs. We applied a user-centred design approach in Dwesa community and used qualitative and quantitative research methods to collect data for the design of the user interfaces (graphic user interface and voice user interface) and mobile commerce application. We identified and used several interface elements to design and finally evaluate the graphical user interface. The statistics analysis of the evaluation results show that the users in the community have positive perception of the usefulness of the application, the ease of use and intention to use the application. Community users with no prior experience with this technology were able to learn and understand the interface, recorded minimum errors and a high level of v precision during task performance when they interacted with the shop-owner graphic user interface. The voice user interface designed in this study consists of two flavours (dual tone multi-frequency input and voice input) for rural users. The evaluation results show that community users recorded higher tasks successes and minimum errors with the dual tone multi-frequency input interface than the voice only input interface. Also, a higher percentage of users prefer the dual tone multi-frequency input interface. The t-Test statistical analysis performed on the tasks completion times and error rate show that there was significant statistical difference between the dual tone multi-frequency input interface and the voice input interface. The interfaces were easy to learn, understand and use. Properly designed user interfaces that meet the experience and capabilities of low-literacy users in rural areas will improve usability and users‟ experiences. Adaptation of interfaces to users‟ culture and preferences will enhance information services accessibility among different user groups in different regions. This will promote technology acceptance in rural communities for socio-economic benefits. The user interfaces presented in this study can be adapted to different cultures to provide similar services for marginalised communities in developing countries
- Full Text:
- Date Issued: 2010
Using systematic case studies to investigate therapist responsiveness : examples from a case series of PTSD treatments
- Authors: Edwards, David J A
- Date: 2010
- Language: English
- Type: Article
- Identifier: vital:6224 , http://hdl.handle.net/10962/d1007774
- Description: This article highlights the emerging literature on therapist responsiveness in psychotherapy and examines several concepts used to identify dimensions of responsiveness. Some methodological obstacles are identified to studying responsiveness in a systematic manner, and several examples of existing responsiveness research are reviewed. It is argued that meaningful theory on responsiveness has emerged from research methods that are qualitative and interpretive and that the writing of systematic case studies can be of particular importance since only the presentation of a case unfolding over time can disclose some of the more complex aspects of therapist responsiveness. Examination of a series of systematic case studies of the treatment of post traumatic case disorder in South Africa was used to derive a model for guiding therapist responsiveness with respect with what to focus on at a particular phase of the therapy within a particular session. Material from the cases is used to illustrate aspects of the model related to building social support for the client and promoting emotional processing of trauma memories. , Acknowledgements: This research was supported by grants from the National Research Foundation and the Joint Research Committee of Rhodes University. An earlier version of this paper was presented at the Conference of the Society for Psychotherapy Research in Barcelona in 2008 (Edwards, 2008).
- Full Text:
- Date Issued: 2010
- Authors: Edwards, David J A
- Date: 2010
- Language: English
- Type: Article
- Identifier: vital:6224 , http://hdl.handle.net/10962/d1007774
- Description: This article highlights the emerging literature on therapist responsiveness in psychotherapy and examines several concepts used to identify dimensions of responsiveness. Some methodological obstacles are identified to studying responsiveness in a systematic manner, and several examples of existing responsiveness research are reviewed. It is argued that meaningful theory on responsiveness has emerged from research methods that are qualitative and interpretive and that the writing of systematic case studies can be of particular importance since only the presentation of a case unfolding over time can disclose some of the more complex aspects of therapist responsiveness. Examination of a series of systematic case studies of the treatment of post traumatic case disorder in South Africa was used to derive a model for guiding therapist responsiveness with respect with what to focus on at a particular phase of the therapy within a particular session. Material from the cases is used to illustrate aspects of the model related to building social support for the client and promoting emotional processing of trauma memories. , Acknowledgements: This research was supported by grants from the National Research Foundation and the Joint Research Committee of Rhodes University. An earlier version of this paper was presented at the Conference of the Society for Psychotherapy Research in Barcelona in 2008 (Edwards, 2008).
- Full Text:
- Date Issued: 2010
Acacia Mearnsii debarking: comparing different debarking technologies in the KwaZulu-Natal and Mpumalanga forestry regions of South Africa
- Authors: Eggers, John Rolf
- Date: 2010
- Subjects: Acacia mearnsii -- South Africa -- KwaZulu-Natal , Acacia mearnsii -- South Africa -- Mpumalanga , Wattles (Plants) -- South Africa -- KwaZulu-Natal , Wattles (Plants) -- South Africa -- Mpumalanga
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: vital:10740 , http://hdl.handle.net/10948/1456 , Acacia mearnsii -- South Africa -- KwaZulu-Natal , Acacia mearnsii -- South Africa -- Mpumalanga , Wattles (Plants) -- South Africa -- KwaZulu-Natal , Wattles (Plants) -- South Africa -- Mpumalanga
- Description: Debarking of Acacia mearnsii in South Africa has been conducted using mainly manual systems. Labour shortages and reliability of these systems has caused interest in alternative systems that might be able to debark A. mearnsii. The aim of the research is to compare three mechanised debarking technologies used to debark A. mearnsii. Research trials were conducted on the Demuth, Hyena and Hypro debarkers that would form part of semi-mechanised harvesting systems. The debarking technologies were analysed and compared in terms of productivity per productive machine hour (PMH), debarking quality, system costs and the quality of the bark that was produced. Furthermore, the effect that tree volume, strippability and form have on each of the debarking technologies was determined. The debarking technologies were affected by each of the factors researched. Decreasing tree form had a negative effect on the productivity of each of the technologies. An increase in strippability class (strengthening wood-bark bond strength) caused a decrease in the productivity of each of the machines. An increasing tree volume had a positive effect on the productivity for the three debarking technologies. After the debarking had taken place, samples of bark were analysed at a laboratory to determine if it was acceptable for the processing facilities. Each of the debarking technologies produced bark of varying dimensions, but they were all found to be acceptable. The system costs of the three debarking technologies were compared to a manual system cost at tree volumes of 0.1m³, 0.15m³ and 0.2m³. The Demuth debarker had the best system cost for a tree size of 0.1m³, while the manual system was best for tree volumes 0.15m³ and 0.2m³. The Demuth, Hyena and manual system costs were very similar for each of the tree volumes, with the Hypro being a little higher.
- Full Text:
- Date Issued: 2010
- Authors: Eggers, John Rolf
- Date: 2010
- Subjects: Acacia mearnsii -- South Africa -- KwaZulu-Natal , Acacia mearnsii -- South Africa -- Mpumalanga , Wattles (Plants) -- South Africa -- KwaZulu-Natal , Wattles (Plants) -- South Africa -- Mpumalanga
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: vital:10740 , http://hdl.handle.net/10948/1456 , Acacia mearnsii -- South Africa -- KwaZulu-Natal , Acacia mearnsii -- South Africa -- Mpumalanga , Wattles (Plants) -- South Africa -- KwaZulu-Natal , Wattles (Plants) -- South Africa -- Mpumalanga
- Description: Debarking of Acacia mearnsii in South Africa has been conducted using mainly manual systems. Labour shortages and reliability of these systems has caused interest in alternative systems that might be able to debark A. mearnsii. The aim of the research is to compare three mechanised debarking technologies used to debark A. mearnsii. Research trials were conducted on the Demuth, Hyena and Hypro debarkers that would form part of semi-mechanised harvesting systems. The debarking technologies were analysed and compared in terms of productivity per productive machine hour (PMH), debarking quality, system costs and the quality of the bark that was produced. Furthermore, the effect that tree volume, strippability and form have on each of the debarking technologies was determined. The debarking technologies were affected by each of the factors researched. Decreasing tree form had a negative effect on the productivity of each of the technologies. An increase in strippability class (strengthening wood-bark bond strength) caused a decrease in the productivity of each of the machines. An increasing tree volume had a positive effect on the productivity for the three debarking technologies. After the debarking had taken place, samples of bark were analysed at a laboratory to determine if it was acceptable for the processing facilities. Each of the debarking technologies produced bark of varying dimensions, but they were all found to be acceptable. The system costs of the three debarking technologies were compared to a manual system cost at tree volumes of 0.1m³, 0.15m³ and 0.2m³. The Demuth debarker had the best system cost for a tree size of 0.1m³, while the manual system was best for tree volumes 0.15m³ and 0.2m³. The Demuth, Hyena and manual system costs were very similar for each of the tree volumes, with the Hypro being a little higher.
- Full Text:
- Date Issued: 2010
Quantifying the annual fish harvest from South Africa’s largest freshwater reservoir
- Ellender, Bruce R, Weyl, Olaf L F, Winker, A Henning, Booth, Anthony J
- Authors: Ellender, Bruce R , Weyl, Olaf L F , Winker, A Henning , Booth, Anthony J
- Date: 2010
- Language: English
- Type: Article
- Identifier: vital:7149 , http://hdl.handle.net/10962/d1011852
- Description: South African inland fisheries are poorly developed and their contribution to near-shore communities is poorly understood. This study is the first comprehensive assessment of recreational and subsistence angling undertaken in an inland fishery in South Africa. The study was conducted on the 360 km2 Lake Gariep, South Africa’s largest freshwater reservoir. A total of 508 anglers were interviewed between February 2007 and January 2008. Of those interviewed, 67% were subsistence anglers and 33% recreational anglers. Catch per unit effort (CPUE) did not differ significantly between sectors. CPUE fluctuated seasonally, ranging between 0.37 (95% CI= 0.26 to 0.51) kg·angler-1·h-1 in winter and 0.88 (0.67 to 1.17) kg·angler- 1·h-1 in summer. The duration of a fishing day ranged from 5.99 (5.24 to 6.74) h in mid-winter to 7.26 (6.88 to 7.63) h in early summer. Expected end-of-day catch (CPUE × fishing-trip duration) ranged from 2.2 to 6.4 kg·angler-1·d-1 depending on the season. The number of anglers ranged from 22 (8 to 53) anglers·d-1 in June/July to 74 (25 to 176) anglers·d-1 in April. Total annual catch from the roving creel survey was estimated at 71.4 (57.4 to 91.4) t·yr-1. Another 7.5 t∙yr-1 were landed during recreational angling competitions. The resultant total catch divided by the lakeshore population equated to a per capita fish supply of 11.1 kg·yr-1. More than 70% of the catch was the alien invasive carp Cyprinus carpio and there was no evidence of overfishing. The fish resource of Lake Gariep is of significant recreational and subsistence value. As a result of the low fish price (ZAR5.72 ± 2.60·kg-1) subsistence fishing was considered a low-revenue activity that mainly augmented food security in lakeshore communities. The relatively high CPUE indicated that the fishery may be an important safety-net during periods when alternate sources of livelihoods are limited. Consequently, we recommend that the importance of angling to local communities needs to be taken into account when planning fisheries development and developing an inland fisheries policy
- Full Text:
- Date Issued: 2010
- Authors: Ellender, Bruce R , Weyl, Olaf L F , Winker, A Henning , Booth, Anthony J
- Date: 2010
- Language: English
- Type: Article
- Identifier: vital:7149 , http://hdl.handle.net/10962/d1011852
- Description: South African inland fisheries are poorly developed and their contribution to near-shore communities is poorly understood. This study is the first comprehensive assessment of recreational and subsistence angling undertaken in an inland fishery in South Africa. The study was conducted on the 360 km2 Lake Gariep, South Africa’s largest freshwater reservoir. A total of 508 anglers were interviewed between February 2007 and January 2008. Of those interviewed, 67% were subsistence anglers and 33% recreational anglers. Catch per unit effort (CPUE) did not differ significantly between sectors. CPUE fluctuated seasonally, ranging between 0.37 (95% CI= 0.26 to 0.51) kg·angler-1·h-1 in winter and 0.88 (0.67 to 1.17) kg·angler- 1·h-1 in summer. The duration of a fishing day ranged from 5.99 (5.24 to 6.74) h in mid-winter to 7.26 (6.88 to 7.63) h in early summer. Expected end-of-day catch (CPUE × fishing-trip duration) ranged from 2.2 to 6.4 kg·angler-1·d-1 depending on the season. The number of anglers ranged from 22 (8 to 53) anglers·d-1 in June/July to 74 (25 to 176) anglers·d-1 in April. Total annual catch from the roving creel survey was estimated at 71.4 (57.4 to 91.4) t·yr-1. Another 7.5 t∙yr-1 were landed during recreational angling competitions. The resultant total catch divided by the lakeshore population equated to a per capita fish supply of 11.1 kg·yr-1. More than 70% of the catch was the alien invasive carp Cyprinus carpio and there was no evidence of overfishing. The fish resource of Lake Gariep is of significant recreational and subsistence value. As a result of the low fish price (ZAR5.72 ± 2.60·kg-1) subsistence fishing was considered a low-revenue activity that mainly augmented food security in lakeshore communities. The relatively high CPUE indicated that the fishery may be an important safety-net during periods when alternate sources of livelihoods are limited. Consequently, we recommend that the importance of angling to local communities needs to be taken into account when planning fisheries development and developing an inland fisheries policy
- Full Text:
- Date Issued: 2010
Implementation of novel flow cytometric methods to assess the in vitro antidiabetic mechanism of a Sutherlandia Frutescens extract
- Authors: Elliot, Gayle Pamela
- Date: 2010
- Subjects: Insulin resistance -- South Africa , Insulin -- Therapeutic use -- South Africa , Medicinal plants -- South Africa , Non-insulin-dependent diabetes -- South Africa
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:10304 , http://hdl.handle.net/10948/1439 , Insulin resistance -- South Africa , Insulin -- Therapeutic use -- South Africa , Medicinal plants -- South Africa , Non-insulin-dependent diabetes -- South Africa
- Description: The ability of insulin to stimulate glucose uptake into muscle and adipose tissue is central to the maintenance of whole-body glucose homeostasis. Deregulation of insulin action manifests itself as insulin resistance, a key component of type 2 diabetes. Insulin resistance is also observed in HIV patients receiving protease inhibitors. An agent that can reversibly induce an insulin-resistant state would be a very useful tool in developing model systems that mimic the pathogenesis of type 2 diabetes. Insulin resistance can arise from defects in insulin signal transduction, changes in the expression of proteins or genes that are targets of insulin action, cross talk from other hormonal systems or metabolic abnormalities. Deterioration of the insulin-receptor-signalling pathway at different levels leading to decreased levels of signalling pathway intermediates and/or decreased activation through phosphorylation accounts for the evolution from an insulin-resistant state to type 2 diabetes. In addition, defects in GLUT4 glucose transporter translocation are observed, further fuelling impairments in skeletal muscle glucose uptake. Levels of insulin-induced GLUT4 translocation in the skeletal muscle of type 2 diabetic patients are typically reduced by 90%. Many cellular pathways & their intermediates are in some way or another linked to insulin signalling. This study focused on three of these namely the PI3-kinase/Akt pathway, the Mitogen Activated Protein Kinase (MAPK) cascade and the AMP Kinase pathway, with successful monitoring of the PI3-K pathway. Investigations involved observing and evaluating the effects of various compounds as well as an indigenous medicinal plant, Sutherlandia frutescens on the activities of key insulin signalling pathway intermediates within the three fore mentioned pathways including Akt, AMPK and MEK1/2 as well as membrane surface GLUT4 levels. Scientific research has in the past leant heavily on Western blotting as the method of choice for gaining vital information relating to signal transduction pathways, however for research into cellular mechanisms the negatives of this method outweigh the positives. The drawbacks include a need for large amount of cells, multiple washing steps which may be disadvantageous to any weak and transient interactions as well as lysing of cells which may interfere with the maintenance of the subcellular localisation of a specific signalling event. Based on these, the need for a better method in terms of speed & reliability to monitor phosphorylation states of signal transduction pathway intermediates & GLUT4 translocation was evident and was one VII of the main aims & successes of this study. The method created used the mouse muscle cell line C2C12 in conjunction with the quick, sensitive method of flow cytometry which allowed us to monitor these processes in these cells through immune-labelling. Adherent cell cultures such as the C2C12 cell line pose the problem of possible damage to plasma membrane receptors (including insulin receptors) during harvesting to obtain a cell suspension for flow cytometry. We however used C2C12 mouse myocytes to optimize a method yielding insulin responsive cells in suspension that were successfully used for flow cytometry after immunelabelling of insulin signalling intermediates. Insulin (0.1μM) significantly raised the levels of both P-Akt and GLUT4 above basal levels. This effect was shown to be dose dependent. At a concentration of 50μg/ml, Sutherlandia frutescens was able to act as an insulin-mimetic in terms of its ability to increase P-Akt levels, GLUT4 translocation and glucose utilisation in an acute manner. These increases could be reduced with the addition of wortmannin, a PI3-K inhibitor. Therefore, these results suggest the mechanism of the plant extract’s insulin-like activity may be in part due to the activation of the insulin signalling pathway leading to GLUT4 translocation, which involves the phosphorylation of insulin receptor- and subsequent PI3-K activity, leading to P-Akt activity. These results provide further evidence of this plant extract’s anti-diabetic potential. The effect of Sutherlandia frutescens on insulin secretion, calcium signalling and proliferation in INS-1 rat pancreatic cells was also investigated and it was found to increase the activities of all of these processes. However no change in the levels of GLUT2 glucose transporter was seen. Ritonavir is prescribed by the South African Department of Health in co-formulation with other protease inhibitors within its second regime in the treatment of HIV and AIDS. Using C2C12 cells, ritonavir decreased glucose uptake acutely and had no effect on GLUT4 translocation however surprisingly increased P-Akt levels. In conclusion, it was found that Sutherlandia frutescens has antidiabetic benefits, diverse in nature depending on tissue type as well as length of time administered. The establishment of novel flow cytometry techniques to assess antidiabetic properties using in vitro cell culture was achieved. These methods will be useful in the future for the assessment of insulin sensitivity and in the identification of novel compounds that stimulate the insulin signalling pathways.
- Full Text:
- Date Issued: 2010
- Authors: Elliot, Gayle Pamela
- Date: 2010
- Subjects: Insulin resistance -- South Africa , Insulin -- Therapeutic use -- South Africa , Medicinal plants -- South Africa , Non-insulin-dependent diabetes -- South Africa
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:10304 , http://hdl.handle.net/10948/1439 , Insulin resistance -- South Africa , Insulin -- Therapeutic use -- South Africa , Medicinal plants -- South Africa , Non-insulin-dependent diabetes -- South Africa
- Description: The ability of insulin to stimulate glucose uptake into muscle and adipose tissue is central to the maintenance of whole-body glucose homeostasis. Deregulation of insulin action manifests itself as insulin resistance, a key component of type 2 diabetes. Insulin resistance is also observed in HIV patients receiving protease inhibitors. An agent that can reversibly induce an insulin-resistant state would be a very useful tool in developing model systems that mimic the pathogenesis of type 2 diabetes. Insulin resistance can arise from defects in insulin signal transduction, changes in the expression of proteins or genes that are targets of insulin action, cross talk from other hormonal systems or metabolic abnormalities. Deterioration of the insulin-receptor-signalling pathway at different levels leading to decreased levels of signalling pathway intermediates and/or decreased activation through phosphorylation accounts for the evolution from an insulin-resistant state to type 2 diabetes. In addition, defects in GLUT4 glucose transporter translocation are observed, further fuelling impairments in skeletal muscle glucose uptake. Levels of insulin-induced GLUT4 translocation in the skeletal muscle of type 2 diabetic patients are typically reduced by 90%. Many cellular pathways & their intermediates are in some way or another linked to insulin signalling. This study focused on three of these namely the PI3-kinase/Akt pathway, the Mitogen Activated Protein Kinase (MAPK) cascade and the AMP Kinase pathway, with successful monitoring of the PI3-K pathway. Investigations involved observing and evaluating the effects of various compounds as well as an indigenous medicinal plant, Sutherlandia frutescens on the activities of key insulin signalling pathway intermediates within the three fore mentioned pathways including Akt, AMPK and MEK1/2 as well as membrane surface GLUT4 levels. Scientific research has in the past leant heavily on Western blotting as the method of choice for gaining vital information relating to signal transduction pathways, however for research into cellular mechanisms the negatives of this method outweigh the positives. The drawbacks include a need for large amount of cells, multiple washing steps which may be disadvantageous to any weak and transient interactions as well as lysing of cells which may interfere with the maintenance of the subcellular localisation of a specific signalling event. Based on these, the need for a better method in terms of speed & reliability to monitor phosphorylation states of signal transduction pathway intermediates & GLUT4 translocation was evident and was one VII of the main aims & successes of this study. The method created used the mouse muscle cell line C2C12 in conjunction with the quick, sensitive method of flow cytometry which allowed us to monitor these processes in these cells through immune-labelling. Adherent cell cultures such as the C2C12 cell line pose the problem of possible damage to plasma membrane receptors (including insulin receptors) during harvesting to obtain a cell suspension for flow cytometry. We however used C2C12 mouse myocytes to optimize a method yielding insulin responsive cells in suspension that were successfully used for flow cytometry after immunelabelling of insulin signalling intermediates. Insulin (0.1μM) significantly raised the levels of both P-Akt and GLUT4 above basal levels. This effect was shown to be dose dependent. At a concentration of 50μg/ml, Sutherlandia frutescens was able to act as an insulin-mimetic in terms of its ability to increase P-Akt levels, GLUT4 translocation and glucose utilisation in an acute manner. These increases could be reduced with the addition of wortmannin, a PI3-K inhibitor. Therefore, these results suggest the mechanism of the plant extract’s insulin-like activity may be in part due to the activation of the insulin signalling pathway leading to GLUT4 translocation, which involves the phosphorylation of insulin receptor- and subsequent PI3-K activity, leading to P-Akt activity. These results provide further evidence of this plant extract’s anti-diabetic potential. The effect of Sutherlandia frutescens on insulin secretion, calcium signalling and proliferation in INS-1 rat pancreatic cells was also investigated and it was found to increase the activities of all of these processes. However no change in the levels of GLUT2 glucose transporter was seen. Ritonavir is prescribed by the South African Department of Health in co-formulation with other protease inhibitors within its second regime in the treatment of HIV and AIDS. Using C2C12 cells, ritonavir decreased glucose uptake acutely and had no effect on GLUT4 translocation however surprisingly increased P-Akt levels. In conclusion, it was found that Sutherlandia frutescens has antidiabetic benefits, diverse in nature depending on tissue type as well as length of time administered. The establishment of novel flow cytometry techniques to assess antidiabetic properties using in vitro cell culture was achieved. These methods will be useful in the future for the assessment of insulin sensitivity and in the identification of novel compounds that stimulate the insulin signalling pathways.
- Full Text:
- Date Issued: 2010
Humour's critical capacity in the context of South African dance, with two related analyses
- Authors: Elliott, Nicola
- Date: 2010
- Subjects: Dance -- South Africa Choreography -- South Africa Dance criticism -- South Africa Theater -- South Africa South African wit and humor
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2137 , http://hdl.handle.net/10962/d1002369
- Description: This thesis spans two fields - South African dance and the philosophy of humour - and attempts to link them through an understanding of their formal mechanisms. I attempt to establish two main ideas: that there is a need for a critical praxis in South African dance, and that humour in dance can be part of this process. In Chapter One, I discuss elements of the South African dance and theatre industries pre- and post-1994 towards arguing my first point (that South African dance would benefit from a critical praxis). I probe some of the challenges facing artists and describe howchoreographers are dealing thematically and stylistically (but not formally) with the concept of the 'New' South Africa. Through an investigation of concerns voiced by critics regarding choreographic form in the country, I argue that South African dance would benefit from critical formal investigations in dance-making. Finally, I discuss traditional views of humour in South African dance/theatre and in philosophy, which suggest that humour is predominantly seen as frivolous and unworthy of serious attenfion. In Chapter Two, I offer a defence for humour's more profound critical aspects, suggesting that humour can in fact be seen as critical 'thinking in action'. A discussion of theories about humour reveals that the basis for humour is the incongruous. A subsequent discussion of form in theatre and dance shows how the incongruous might work within dance form to create meta-dance. In this way, I attempt to link the two fields of humour and South African dance and to make the connection between the critical capaci~ies of meta-dance and those of humour. I suggest, in other words, that humour in dance can create a critical awareness, of the likes advocated in Chapter One. In Chapter Three, I discuss aspects of two works: my own This part should be uncomfortable (2008) and Nelisiwe Xaba's Plasticization (2004). The two analyses differ from each other as does the humour in both works. Despite the differences, I argue that humour in both works is operating on a critical level that includes a meta-level of signification.
- Full Text:
- Date Issued: 2010
- Authors: Elliott, Nicola
- Date: 2010
- Subjects: Dance -- South Africa Choreography -- South Africa Dance criticism -- South Africa Theater -- South Africa South African wit and humor
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2137 , http://hdl.handle.net/10962/d1002369
- Description: This thesis spans two fields - South African dance and the philosophy of humour - and attempts to link them through an understanding of their formal mechanisms. I attempt to establish two main ideas: that there is a need for a critical praxis in South African dance, and that humour in dance can be part of this process. In Chapter One, I discuss elements of the South African dance and theatre industries pre- and post-1994 towards arguing my first point (that South African dance would benefit from a critical praxis). I probe some of the challenges facing artists and describe howchoreographers are dealing thematically and stylistically (but not formally) with the concept of the 'New' South Africa. Through an investigation of concerns voiced by critics regarding choreographic form in the country, I argue that South African dance would benefit from critical formal investigations in dance-making. Finally, I discuss traditional views of humour in South African dance/theatre and in philosophy, which suggest that humour is predominantly seen as frivolous and unworthy of serious attenfion. In Chapter Two, I offer a defence for humour's more profound critical aspects, suggesting that humour can in fact be seen as critical 'thinking in action'. A discussion of theories about humour reveals that the basis for humour is the incongruous. A subsequent discussion of form in theatre and dance shows how the incongruous might work within dance form to create meta-dance. In this way, I attempt to link the two fields of humour and South African dance and to make the connection between the critical capaci~ies of meta-dance and those of humour. I suggest, in other words, that humour in dance can create a critical awareness, of the likes advocated in Chapter One. In Chapter Three, I discuss aspects of two works: my own This part should be uncomfortable (2008) and Nelisiwe Xaba's Plasticization (2004). The two analyses differ from each other as does the humour in both works. Despite the differences, I argue that humour in both works is operating on a critical level that includes a meta-level of signification.
- Full Text:
- Date Issued: 2010
Contextualising curriculum through issues-based approaches: a case of eco-schools in Kenya
- Authors: Epus, Joash Gregory Odeke
- Date: 2010
- Subjects: Environmental education -- Kenya -- Case studies Curriculum planning -- Kenya -- Case studies Curriculum change -- Kenya -- Case studies Environmental literacy -- Study and teaching -- Namibia -- Case studies Environmental education -- Activity programs -- Namibia -- Case studies Conservation of natural resources -- Study and teaching -- Namibia -- Case studies
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1463 , http://hdl.handle.net/10962/d1003344
- Description: This study involved an issues-based approach to curriculum contextualisation in the context of the Eco-Schools programme in Kenya. It adopted a two-phase design using interpretivist and socially critical research orientations. In this study, research is represented as a process which is socially constructed within a particular theoretical, contextual, social and historical context by unfolding the thesis to illuminate how the phases are closely woven into each other. The first phase used the survey method for a contextual review of existing approaches and views relating to environmental education in the formal education sector. The survey aimed to develop a deeper understanding of environmental education as currently practiced in Kenya and to unravel the complexities surrounding it. It involved about two hundred and six primary school teachers and a critical review of a set of resource materials used in Kenyan Primary Schools. It revealed that some aspects of environmental education practice and the prevailing technocratic view of curriculum in Kenyan primary schools potentially limit possibilities for issues-based approaches to curriculum contextualisation. The action research process in four case study schools in Nyanza province of Kenya represent an attempt to address issues in context through socially critical environmental education. Participant observations, workshops and document analysis revealed that, contextualised conceptions of the terms ‘environment’ and ‘environmental education’ that resulted from a process of deliberation of meaning by teachers in relation to their contexts and practices served to set perspective for the action research process. Further, the planning phase which involved environmental auditing to identify issues of concern, prioritization of actions, issues to address, and action planning to guide implementation was critical in setting the agenda of the action research process in each of the case study schools. Integration and infusion of local issues of concern into curriculum planning further enriched processes of curriculum contextualisation, making them relevant to local contexts by addressing real issues through appropriate pedagogical approaches in auditing, investigation and research, communicating and interpreting results, reflecting on investigations and taking action. The action research process further enhanced cooperation and partnership between the case study schools and surrounding communities with mutual benefits. The research report demonstrates that despite the limitations posed by the technocratic orientation of the Kenyan curriculum, it is possible to address real environmental issues, risks and associated sustainable development challenges in context through issues-based approaches to curriculum contextualisation in the context of the Eco-Schools programme.
- Full Text:
- Date Issued: 2010
- Authors: Epus, Joash Gregory Odeke
- Date: 2010
- Subjects: Environmental education -- Kenya -- Case studies Curriculum planning -- Kenya -- Case studies Curriculum change -- Kenya -- Case studies Environmental literacy -- Study and teaching -- Namibia -- Case studies Environmental education -- Activity programs -- Namibia -- Case studies Conservation of natural resources -- Study and teaching -- Namibia -- Case studies
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1463 , http://hdl.handle.net/10962/d1003344
- Description: This study involved an issues-based approach to curriculum contextualisation in the context of the Eco-Schools programme in Kenya. It adopted a two-phase design using interpretivist and socially critical research orientations. In this study, research is represented as a process which is socially constructed within a particular theoretical, contextual, social and historical context by unfolding the thesis to illuminate how the phases are closely woven into each other. The first phase used the survey method for a contextual review of existing approaches and views relating to environmental education in the formal education sector. The survey aimed to develop a deeper understanding of environmental education as currently practiced in Kenya and to unravel the complexities surrounding it. It involved about two hundred and six primary school teachers and a critical review of a set of resource materials used in Kenyan Primary Schools. It revealed that some aspects of environmental education practice and the prevailing technocratic view of curriculum in Kenyan primary schools potentially limit possibilities for issues-based approaches to curriculum contextualisation. The action research process in four case study schools in Nyanza province of Kenya represent an attempt to address issues in context through socially critical environmental education. Participant observations, workshops and document analysis revealed that, contextualised conceptions of the terms ‘environment’ and ‘environmental education’ that resulted from a process of deliberation of meaning by teachers in relation to their contexts and practices served to set perspective for the action research process. Further, the planning phase which involved environmental auditing to identify issues of concern, prioritization of actions, issues to address, and action planning to guide implementation was critical in setting the agenda of the action research process in each of the case study schools. Integration and infusion of local issues of concern into curriculum planning further enriched processes of curriculum contextualisation, making them relevant to local contexts by addressing real issues through appropriate pedagogical approaches in auditing, investigation and research, communicating and interpreting results, reflecting on investigations and taking action. The action research process further enhanced cooperation and partnership between the case study schools and surrounding communities with mutual benefits. The research report demonstrates that despite the limitations posed by the technocratic orientation of the Kenyan curriculum, it is possible to address real environmental issues, risks and associated sustainable development challenges in context through issues-based approaches to curriculum contextualisation in the context of the Eco-Schools programme.
- Full Text:
- Date Issued: 2010
The fatigue life cycle prediction of a light aircraft undercarriage
- Authors: Erasmus, Daniel Jacobus
- Date: 2010
- Subjects: Metals--Fatigue
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: vital:9614 , http://hdl.handle.net/10948/1527 , Metals--Fatigue
- Description: The reliability of systems relies heavily on accurate fatigue life prediction of related components. Fatigue life prediction is a complicated process requiring the correct methodology to determine accurate and reliable predictions. The Palmgren – Miner damage accumulation hypothesis is widely used in determining the fatigue life of components exposed to variable loading conditions. Modifications have been made to this hypothesis trying to achieve a greater degree of accuracy, of these the Liu – Zenner modification has been the most successful. In this report the systematic process of fatigue life prediction using the Liu – Zenner modification to achieve reliable results is calculated. A representative stress time history measured in service on the component forms the basis for defining a flight cycle which is the chosen unit in which to express the fatigue life. Rainflow cycle counting performed on the stress time history allowed the formulation of a load spectrum to which the component is exposed in one cycle. Combining the load spectrum with the developed SN curve of the component and using the Liu – Zenner modification to the Palmgren – Miner rule a reliable fatigue life in cycles is predicted.
- Full Text:
- Date Issued: 2010
- Authors: Erasmus, Daniel Jacobus
- Date: 2010
- Subjects: Metals--Fatigue
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: vital:9614 , http://hdl.handle.net/10948/1527 , Metals--Fatigue
- Description: The reliability of systems relies heavily on accurate fatigue life prediction of related components. Fatigue life prediction is a complicated process requiring the correct methodology to determine accurate and reliable predictions. The Palmgren – Miner damage accumulation hypothesis is widely used in determining the fatigue life of components exposed to variable loading conditions. Modifications have been made to this hypothesis trying to achieve a greater degree of accuracy, of these the Liu – Zenner modification has been the most successful. In this report the systematic process of fatigue life prediction using the Liu – Zenner modification to achieve reliable results is calculated. A representative stress time history measured in service on the component forms the basis for defining a flight cycle which is the chosen unit in which to express the fatigue life. Rainflow cycle counting performed on the stress time history allowed the formulation of a load spectrum to which the component is exposed in one cycle. Combining the load spectrum with the developed SN curve of the component and using the Liu – Zenner modification to the Palmgren – Miner rule a reliable fatigue life in cycles is predicted.
- Full Text:
- Date Issued: 2010
Photophysical properties of newly synthesized fluorinated zinc phthalocyanines in the presence of CdTe quantum dots and the accompanying energy transfer processes
- Erdoğmuş, Ali, Moeno, Sharon, Litwinski, Christian, Nyokong, Tebello
- Authors: Erdoğmuş, Ali , Moeno, Sharon , Litwinski, Christian , Nyokong, Tebello
- Date: 2010
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/262671 , vital:53543 , xlink:href="https://doi.org/10.1016/j.jphotochem.2009.12.014"
- Description: The photophysical properties of two newly synthesized phthalocyanines (Pcs) were studied in the presence and the absence of 3-mercaptopropionic acid (MPA) capped quantum dots (QDs). Energy transfer processes resulting from the combination of QDs and the Pcs: 4-(tetrakis-5-(trifluoromethyl)-2-mercaptopyridinephthalocyaninato)zinc(II) (TtfmMPyZnPc, 3) and 4-(tetrakis-5-(trifluoromethyl)-2-pyridyloxyphthalocyaninato) zinc(II) (TtfmPyZnPc, 4) were also studied. The photophysical properties of the Pcs in the presence of QDs were enhanced and Förster resonance energy transfer (FRET) was observed with the phthalocyanines used. The efficiency of FRET between the QDs and TtfmMPyZnPc and TtfmPyZnPc was found to be 0.31% and 0.45% in DMSO and 0.24% and 0.32% in pyridine, respectively. The triplet state quantum yields for TtfmMPyZnPc and TtfmPyZnPc were found to be 0.86 and 0.74 in DMSO and 0.83 and 0.76 in pyridine.
- Full Text:
- Date Issued: 2010
- Authors: Erdoğmuş, Ali , Moeno, Sharon , Litwinski, Christian , Nyokong, Tebello
- Date: 2010
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/262671 , vital:53543 , xlink:href="https://doi.org/10.1016/j.jphotochem.2009.12.014"
- Description: The photophysical properties of two newly synthesized phthalocyanines (Pcs) were studied in the presence and the absence of 3-mercaptopropionic acid (MPA) capped quantum dots (QDs). Energy transfer processes resulting from the combination of QDs and the Pcs: 4-(tetrakis-5-(trifluoromethyl)-2-mercaptopyridinephthalocyaninato)zinc(II) (TtfmMPyZnPc, 3) and 4-(tetrakis-5-(trifluoromethyl)-2-pyridyloxyphthalocyaninato) zinc(II) (TtfmPyZnPc, 4) were also studied. The photophysical properties of the Pcs in the presence of QDs were enhanced and Förster resonance energy transfer (FRET) was observed with the phthalocyanines used. The efficiency of FRET between the QDs and TtfmMPyZnPc and TtfmPyZnPc was found to be 0.31% and 0.45% in DMSO and 0.24% and 0.32% in pyridine, respectively. The triplet state quantum yields for TtfmMPyZnPc and TtfmPyZnPc were found to be 0.86 and 0.74 in DMSO and 0.83 and 0.76 in pyridine.
- Full Text:
- Date Issued: 2010
Novel, soluble, FluXoro functional substituted zinc phthalocyanines; synthesis, characterization and photophysicochemical properties
- Erdoğmuş, Ali, Nyokong, Tebello
- Authors: Erdoğmuş, Ali , Nyokong, Tebello
- Date: 2010
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/261258 , vital:53378 , xlink:href="https://doi.org/10.1016/j.dyepig.2010.01.001"
- Description: Three novel phthalonitriles and the respective, peripheral tetrakis zinc phthalocyanines were synthesized and characterized using elemental analysis, IR, 1H NMR, mass spectra and electronic spectroscopy. The phthalocyanines displayed good solubility in organic solvents such as CHCl3, DCM, DMSO, DMF, THF and toluene. The presence of a long chain fluorine substitituent was found to result in reduced aggregation. The singlet oxygen, photodegradation, fluorescence quantum yield, triplet quantum yield and triplet life time of the complexes in toluene were determined. The effect of fluoro-functional groups on the photophysical and photochemical parameters of the zinc(II) phthalocyanines are also reported. Fluorescence quantum yields for the complexes ranged from 0.021 to 0.041.
- Full Text:
- Date Issued: 2010
- Authors: Erdoğmuş, Ali , Nyokong, Tebello
- Date: 2010
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/261258 , vital:53378 , xlink:href="https://doi.org/10.1016/j.dyepig.2010.01.001"
- Description: Three novel phthalonitriles and the respective, peripheral tetrakis zinc phthalocyanines were synthesized and characterized using elemental analysis, IR, 1H NMR, mass spectra and electronic spectroscopy. The phthalocyanines displayed good solubility in organic solvents such as CHCl3, DCM, DMSO, DMF, THF and toluene. The presence of a long chain fluorine substitituent was found to result in reduced aggregation. The singlet oxygen, photodegradation, fluorescence quantum yield, triplet quantum yield and triplet life time of the complexes in toluene were determined. The effect of fluoro-functional groups on the photophysical and photochemical parameters of the zinc(II) phthalocyanines are also reported. Fluorescence quantum yields for the complexes ranged from 0.021 to 0.041.
- Full Text:
- Date Issued: 2010
Movement patterns and population dynamics of four catsharks endemic to South Africa
- Authors: Escobar-Porras, Jessica
- Date: 2010
- Subjects: Chondrichthyes -- South Africa , Fish populations -- South Africa , Fishes -- Behavior -- South Africa
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5303 , http://hdl.handle.net/10962/d1005148 , Chondrichthyes -- South Africa , Fish populations -- South Africa , Fishes -- Behavior -- South Africa
- Description: Sharks are particularly vulnerable to over-exploitation. Although catsharks are an important component of the near-shore marine biodiversity in South Africa and most of the species are endemic, little is known about their movement patterns, home range and population size. With an increasing number of recreational fishers this information is crucial for their conservation. The aims of this study were threefold. Firstly, to identify and analyze existing data sources on movement patterns and population dynamics for four catshark species: pyjama (Poroderma africanum), leopard (P. pantherinum), puffadder (Haploblepharus edwarsii) and brown (H. fuscus). This highlighted a number of shortcomings with existing data sets, largely because these studies had diverse objectives and were not aimed solely at catsharks. Secondly, a dedicated study was carried out for a limited area, testing a number of methods for data collection, and where appropriate the data was analyzed to determine movement patterns and population numbers. Thirdly, the most appropriate methodology for future studies (with similar objectives) was identified, and the results of the study were used to propose a number of conservation measures. All species of catsharks exhibited strong site fidelity and limited dispersal for extended periods. A few individuals did, however, travel distances in excess of 150 km. Significant trends in temporal abundance were not observed, nevertheless, there was some evidence for higher catches from September to December. Population estimates for the study area were low, with P. africanum having the smallest population size while H. fuscus had the highest population size within the restricted study area. Limited movements, high site fidelity and small population sizes emphasize their vulnerability and suggest that catsharks would benefit from no-take marine protected areas.
- Full Text:
- Date Issued: 2010
- Authors: Escobar-Porras, Jessica
- Date: 2010
- Subjects: Chondrichthyes -- South Africa , Fish populations -- South Africa , Fishes -- Behavior -- South Africa
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5303 , http://hdl.handle.net/10962/d1005148 , Chondrichthyes -- South Africa , Fish populations -- South Africa , Fishes -- Behavior -- South Africa
- Description: Sharks are particularly vulnerable to over-exploitation. Although catsharks are an important component of the near-shore marine biodiversity in South Africa and most of the species are endemic, little is known about their movement patterns, home range and population size. With an increasing number of recreational fishers this information is crucial for their conservation. The aims of this study were threefold. Firstly, to identify and analyze existing data sources on movement patterns and population dynamics for four catshark species: pyjama (Poroderma africanum), leopard (P. pantherinum), puffadder (Haploblepharus edwarsii) and brown (H. fuscus). This highlighted a number of shortcomings with existing data sets, largely because these studies had diverse objectives and were not aimed solely at catsharks. Secondly, a dedicated study was carried out for a limited area, testing a number of methods for data collection, and where appropriate the data was analyzed to determine movement patterns and population numbers. Thirdly, the most appropriate methodology for future studies (with similar objectives) was identified, and the results of the study were used to propose a number of conservation measures. All species of catsharks exhibited strong site fidelity and limited dispersal for extended periods. A few individuals did, however, travel distances in excess of 150 km. Significant trends in temporal abundance were not observed, nevertheless, there was some evidence for higher catches from September to December. Population estimates for the study area were low, with P. africanum having the smallest population size while H. fuscus had the highest population size within the restricted study area. Limited movements, high site fidelity and small population sizes emphasize their vulnerability and suggest that catsharks would benefit from no-take marine protected areas.
- Full Text:
- Date Issued: 2010
Beta-N-methylamino-L-alanine in South African fresh water cyanobacteria : incidence, prevalence, ecotoxicological considerations and human exposure risk
- Authors: Esterhuizen-Londt, Maranda
- Date: 2010
- Subjects: Cyanobacteria , Bioaccumulation , Chromatographic analysis , Neurotoxic agents
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:10306 , http://hdl.handle.net/10948/1473 , Cyanobacteria , Bioaccumulation , Chromatographic analysis , Neurotoxic agents
- Description: β-N-methylamino-L-alanine (BMAA) is a non-proteinogenic amino acid associated with human neurodegenerative disease. Due to the cosmopolitan nature of cyanobacteria, detection of BMAA in cyanobacteria has caused concerns about human exposure risk. This study was therefore based on the hypothesis that BMAA poses a health risk to humans either by direct ingestion or by indirect exposure to BMAA from a cyanobacterial source via a freshwater food chain. A validated gas chromatography-mass spectrometry (GC-MS) BMAA analysis method and a confirmatory liquid chromatography-mass spectrometry (LC-MS) method, with improved sensitivity, were developed in addition to a LC-MS/MS method for analyte confirmation. These methods were used to quantify BMAA in South African cyanobacteria, isolated from various potable water reservoirs. The majority of the isolates tested, contained BMAA. Possible human exposure by direct consumption of BMAA released from cyanobacterial blooms was investigated by the development of a robust solid phase extraction (SPE) method used for BMAA concentration and quantification in raw and treated tap water. Despite the use of the SPE method that facilitated the concentration of BMAA from large quantities of water, no free dissolved BMAA was detected in raw or processed fresh water. The fate of exogenous BMAA was therefore investigated firstly by evaluating the efficacy of standard water treatment processes employed in South Africa and secondly by investigating the possibility of BMAA bioaccumulation and biomagnification in aquatic food chains. Standard water treatment processes proved highly efficient at removing free dissolved BMAA, explaining the absence of BMAA in treated tap water. However, the cause of the BMAA absence in raw potable water remained unknown. Uptake of BMAA by model aquatic organisms was investigated in controlled experiments. BMAA uptake was documented in both Ceratophyllum demersum and Daphnia magna, however, BMAA-protein association and biomagnification were not observed in D. magna. BMAA had an inhibitory effect on the oxidative stress enzyme acitivties of both organisms tested (as well as human S9 extracts), resulting in accumulation of detrimental reactive oxygen species (ROS) in the cells. Exposure of crop plants to BMAA in controlled experiments resulted in BMAA uptake, protein association, and subsequent inhibition of the antioxidative enzyme activities. However, BMAA was detected in neither free nor protein-associated form in natural crop plants irrigated with known BMAA-containing bloom water. Post-mortem liver samples of Clarias gariepinus (Catfish) and Crocodylus niloticus (Crocodile), from a natural fresh water ecosystem that experienced frequent cyanobacterial blooms, contained both free and protein-associated BMAA. Higher BMAA concentrations were found in crocodile liver samples compared to fish liver samples, strongly suggesting biomagnification from one trophic level to the next. BMAA concentrations corresponded to crocodile age. This is the first report of bioaccumulation and biomagnification in two trophic levels in a fresh water ecosystem. These findings strongly suggest possible human exposure via aquatic food chains of cyanobacterial origin. Direct BMAA exposure via drinking water is not plausible due to the efficiency of standard water treatment processes to remove BMAA. The use of raw water for agricultural and recreational use, however, remains a problem. The development of management strategies as well as daily tolerable levels for BMAA is urgently required.
- Full Text:
- Date Issued: 2010
- Authors: Esterhuizen-Londt, Maranda
- Date: 2010
- Subjects: Cyanobacteria , Bioaccumulation , Chromatographic analysis , Neurotoxic agents
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:10306 , http://hdl.handle.net/10948/1473 , Cyanobacteria , Bioaccumulation , Chromatographic analysis , Neurotoxic agents
- Description: β-N-methylamino-L-alanine (BMAA) is a non-proteinogenic amino acid associated with human neurodegenerative disease. Due to the cosmopolitan nature of cyanobacteria, detection of BMAA in cyanobacteria has caused concerns about human exposure risk. This study was therefore based on the hypothesis that BMAA poses a health risk to humans either by direct ingestion or by indirect exposure to BMAA from a cyanobacterial source via a freshwater food chain. A validated gas chromatography-mass spectrometry (GC-MS) BMAA analysis method and a confirmatory liquid chromatography-mass spectrometry (LC-MS) method, with improved sensitivity, were developed in addition to a LC-MS/MS method for analyte confirmation. These methods were used to quantify BMAA in South African cyanobacteria, isolated from various potable water reservoirs. The majority of the isolates tested, contained BMAA. Possible human exposure by direct consumption of BMAA released from cyanobacterial blooms was investigated by the development of a robust solid phase extraction (SPE) method used for BMAA concentration and quantification in raw and treated tap water. Despite the use of the SPE method that facilitated the concentration of BMAA from large quantities of water, no free dissolved BMAA was detected in raw or processed fresh water. The fate of exogenous BMAA was therefore investigated firstly by evaluating the efficacy of standard water treatment processes employed in South Africa and secondly by investigating the possibility of BMAA bioaccumulation and biomagnification in aquatic food chains. Standard water treatment processes proved highly efficient at removing free dissolved BMAA, explaining the absence of BMAA in treated tap water. However, the cause of the BMAA absence in raw potable water remained unknown. Uptake of BMAA by model aquatic organisms was investigated in controlled experiments. BMAA uptake was documented in both Ceratophyllum demersum and Daphnia magna, however, BMAA-protein association and biomagnification were not observed in D. magna. BMAA had an inhibitory effect on the oxidative stress enzyme acitivties of both organisms tested (as well as human S9 extracts), resulting in accumulation of detrimental reactive oxygen species (ROS) in the cells. Exposure of crop plants to BMAA in controlled experiments resulted in BMAA uptake, protein association, and subsequent inhibition of the antioxidative enzyme activities. However, BMAA was detected in neither free nor protein-associated form in natural crop plants irrigated with known BMAA-containing bloom water. Post-mortem liver samples of Clarias gariepinus (Catfish) and Crocodylus niloticus (Crocodile), from a natural fresh water ecosystem that experienced frequent cyanobacterial blooms, contained both free and protein-associated BMAA. Higher BMAA concentrations were found in crocodile liver samples compared to fish liver samples, strongly suggesting biomagnification from one trophic level to the next. BMAA concentrations corresponded to crocodile age. This is the first report of bioaccumulation and biomagnification in two trophic levels in a fresh water ecosystem. These findings strongly suggest possible human exposure via aquatic food chains of cyanobacterial origin. Direct BMAA exposure via drinking water is not plausible due to the efficiency of standard water treatment processes to remove BMAA. The use of raw water for agricultural and recreational use, however, remains a problem. The development of management strategies as well as daily tolerable levels for BMAA is urgently required.
- Full Text:
- Date Issued: 2010
Immunological and molecular characterization of Cryptosporidium species in HIV-Positive and HIV-Negative diarrhoea patients in the Nkonkobe Municipality of the Eastern Cape Province of South Africa: a pilot study
- Authors: Etinosa, Omoruyi Beauty
- Date: 2010
- Subjects: Protozoa, Pathogenic , Pathogenic microorganisms -- Detection , Medical microbiology , HIV-positive persons , Cryptosporidium , Diarrhea , HIV-infections
- Language: English
- Type: Thesis , Masters , MSc (Biochemistry)
- Identifier: vital:11252 , http://hdl.handle.net/10353/392 , Protozoa, Pathogenic , Pathogenic microorganisms -- Detection , Medical microbiology , HIV-positive persons , Cryptosporidium , Diarrhea , HIV-infections
- Description: Cryptosporidiosis is an infection caused by Cryptosporidium; a protozoan parasite that infects the gastrointestinal tract. The infection is of major public health concern in both developed and developing countries. Faecal samples were collected from 160 in-patient adults, with complaint of diarrhoea, admitted at Victoria hospital in Alice, Nkonkobe Municipality. Twenty apparently healthy subjects were included as controls. All diarrhoea positive patients were interviewed to record socio-demographic information, water supply and animal contact. Initial screening was carried out by microscopy and ELISA to detect positive Cryptosporidium. Genomic DNA was extracted from microscopically positive samples and a PCR reaction was perform to amplify the (18S) SSUrRNA gene for further identification and epidemiology of Cryptosporidium. Data were analysed using Pearson‘s χ2 and Fisher‘s exact test to assess the univariate association between Cryptosporidium infection and the possible risk factors. Of the 180 subjects screened for cryptosporidial infection, Cryptosporidium antigen was detected in 122 giving an overall prevalence of 67.8 percent. In HIV-positive diarrhoea patients, prevalence increased with ages; between 31-43 (mean age 36.5 yr) and 70-82 (mean age 75.8 yr) had a higher prevalence (100 percent) of the antigen than 18-30 (mean age 23.2 yr) and 83-95 (mean age 88.8 yr) (50.0 percent) in HIV-positive diarrhoea patients (P > 0.05). In HIV-negative diarrhoea patients, prevalence was highest in the 18-30 (mean age 23.2 yr) (87.5 percent) and least (35.7 percent) in those aged 83-95 (mean age 88.8 yr) (P > 0.05). Cryptosporidium antigen was higher in females than in males. Of 115 females (mean age 46.7yr) who participated in the study, antigen was detected in 90 (78.2 percent) against 32 (71.1 percent) of 45 males (mean age 42.6yr). None of the 20 apparently healthy control subjects was found to be infected with Cryptosporidium. Cryptosporidium was detected in 27 HIV-positive and 97 HIV-negative diarrhoea patients by any one of the techniques. Antigen detection by ELISA 14 showed the highest positivity 96 (76.8 percent) in HIV- negative and 26 (74.3 percent) in HIV- positive diarrhoea patients. PCR detected eighty-nine (71.2 percent) cases in HIV-negative and 23 (65.7 percent) in HIV-positive patients with diarrhoea. Only 13 (37.1 percent) HIV-positive and 34 (27.2 percent) HIV-negative diarrhoea patients were found positive for Cryptosporidium by modified ZN. No significant difference was observed in sensitivity of antigen detection by ELISA and PCR (96.9 percent) in HIV-negative diarrhoea patients, respectively. Specificity of the staining technique was 88.9 percent in HIV-positive and 96.6 percent in HIV-negative diarrhoea patients. No significant difference was found in specificity of antigen detection by ELISA and PCR in HIV-positive and HIV-negative diarrhoea patients, respectively. Positive predictive value of ZN staining in both HIV-positive and HIV-negative diarrhoea patients (92.3 and 96.9 percent) was statistically higher than ELISA and PCR. No significant difference was observed in negative predictive value of ZN technique for detection of Cryptosporidium between HIV-positive and HIV- negative diarrhoea patients. Differences found in prevalence rates due to water source, suggest that the high infection rates of specific groups are associated with their exposure to the contaminated water supply. The results indicate that Cryptosporidium infection is highly prevalent in adult faecal specimens in the Nkonkobe Municipality, an indication of active infection that is likely to emerge as major human pathogen in this location due to socioeconomic changes which favour transmission. However, sequencing analysis is required to differentiate between Cryptosporidium genotypes in the various outbreaks
- Full Text:
- Date Issued: 2010
- Authors: Etinosa, Omoruyi Beauty
- Date: 2010
- Subjects: Protozoa, Pathogenic , Pathogenic microorganisms -- Detection , Medical microbiology , HIV-positive persons , Cryptosporidium , Diarrhea , HIV-infections
- Language: English
- Type: Thesis , Masters , MSc (Biochemistry)
- Identifier: vital:11252 , http://hdl.handle.net/10353/392 , Protozoa, Pathogenic , Pathogenic microorganisms -- Detection , Medical microbiology , HIV-positive persons , Cryptosporidium , Diarrhea , HIV-infections
- Description: Cryptosporidiosis is an infection caused by Cryptosporidium; a protozoan parasite that infects the gastrointestinal tract. The infection is of major public health concern in both developed and developing countries. Faecal samples were collected from 160 in-patient adults, with complaint of diarrhoea, admitted at Victoria hospital in Alice, Nkonkobe Municipality. Twenty apparently healthy subjects were included as controls. All diarrhoea positive patients were interviewed to record socio-demographic information, water supply and animal contact. Initial screening was carried out by microscopy and ELISA to detect positive Cryptosporidium. Genomic DNA was extracted from microscopically positive samples and a PCR reaction was perform to amplify the (18S) SSUrRNA gene for further identification and epidemiology of Cryptosporidium. Data were analysed using Pearson‘s χ2 and Fisher‘s exact test to assess the univariate association between Cryptosporidium infection and the possible risk factors. Of the 180 subjects screened for cryptosporidial infection, Cryptosporidium antigen was detected in 122 giving an overall prevalence of 67.8 percent. In HIV-positive diarrhoea patients, prevalence increased with ages; between 31-43 (mean age 36.5 yr) and 70-82 (mean age 75.8 yr) had a higher prevalence (100 percent) of the antigen than 18-30 (mean age 23.2 yr) and 83-95 (mean age 88.8 yr) (50.0 percent) in HIV-positive diarrhoea patients (P > 0.05). In HIV-negative diarrhoea patients, prevalence was highest in the 18-30 (mean age 23.2 yr) (87.5 percent) and least (35.7 percent) in those aged 83-95 (mean age 88.8 yr) (P > 0.05). Cryptosporidium antigen was higher in females than in males. Of 115 females (mean age 46.7yr) who participated in the study, antigen was detected in 90 (78.2 percent) against 32 (71.1 percent) of 45 males (mean age 42.6yr). None of the 20 apparently healthy control subjects was found to be infected with Cryptosporidium. Cryptosporidium was detected in 27 HIV-positive and 97 HIV-negative diarrhoea patients by any one of the techniques. Antigen detection by ELISA 14 showed the highest positivity 96 (76.8 percent) in HIV- negative and 26 (74.3 percent) in HIV- positive diarrhoea patients. PCR detected eighty-nine (71.2 percent) cases in HIV-negative and 23 (65.7 percent) in HIV-positive patients with diarrhoea. Only 13 (37.1 percent) HIV-positive and 34 (27.2 percent) HIV-negative diarrhoea patients were found positive for Cryptosporidium by modified ZN. No significant difference was observed in sensitivity of antigen detection by ELISA and PCR (96.9 percent) in HIV-negative diarrhoea patients, respectively. Specificity of the staining technique was 88.9 percent in HIV-positive and 96.6 percent in HIV-negative diarrhoea patients. No significant difference was found in specificity of antigen detection by ELISA and PCR in HIV-positive and HIV-negative diarrhoea patients, respectively. Positive predictive value of ZN staining in both HIV-positive and HIV-negative diarrhoea patients (92.3 and 96.9 percent) was statistically higher than ELISA and PCR. No significant difference was observed in negative predictive value of ZN technique for detection of Cryptosporidium between HIV-positive and HIV- negative diarrhoea patients. Differences found in prevalence rates due to water source, suggest that the high infection rates of specific groups are associated with their exposure to the contaminated water supply. The results indicate that Cryptosporidium infection is highly prevalent in adult faecal specimens in the Nkonkobe Municipality, an indication of active infection that is likely to emerge as major human pathogen in this location due to socioeconomic changes which favour transmission. However, sequencing analysis is required to differentiate between Cryptosporidium genotypes in the various outbreaks
- Full Text:
- Date Issued: 2010
Copreneurships in South African small and medium-sized family business
- Authors: Eybers, Carey
- Date: 2010
- Subjects: Couple-owned business enterprises , Family-owned business enterprises -- Succession -- South Africa , Entrepreneurship -- South Africa , Small business -- South Africa
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: vital:9285 , http://hdl.handle.net/10948/1207 , Couple-owned business enterprises , Family-owned business enterprises -- Succession -- South Africa , Entrepreneurship -- South Africa , Small business -- South Africa
- Description: Taking cognisance of the increasingly important role that copreneurial businesses play in national economies, the unique challenges that they face, and the lack of research attention given to such spousal teams, the purpose of this study was to contribute to the more effective functioning of copreneurships in South Africa by identifying the factors that impact on their success. Consequently, the primary objective of this study was to investigate the factors that influence the Perceived success of copreneurships in South Africa, as well as the conditions required for the effective and harmonious functioning of such spousal partnerships. This study seeks to incorporate previous findings and studies on team effectiveness and spousal relationships into a comprehensive conceptual model. After conducting a comprehensive literature study, as well as examining the different teamwork models proposed and the study by Farrington (2009), it became clear that successful teams have validated their proficiency with regard to two types of factors, namely, relational-based and organisational-based factors. Within these two categories of factors, 14 independent variables were identified and hypothesised to influence the measures of effectiveness of copreneurships, namely the dependent variable Perceived success; and the intervening variable Financial performance. All of the factors in this study were clearly defined and operationalised. Reliable and valid items sourced from Farrington’s (2009) measuring instrument, as well as several measuring instruments used in other studies, were used in the operationalisation of these factors. In addition, several items were self-generated from secondary sources. Respondents were identified using the convenience snowball sampling technique, and a structured questionnaire was made available to them. The data gathered from the 380 usable questionnaires was subjected to various statistical analyses. The validity and reliability of the measuring instrument was confirmed by means of an exploratory factor analysis, and Cronbach-alpha coefficients were calculated for this purpose. The original intervening variable Financial performance could not be confirmed as originally intended in the conceptual model. Instead, Financial performance split into v two separate variables which were named Financial performance and Growth performance. The original dependent variable Perceived success was confirmed by the factor analyses. The relational- and organisational-based factors could not be confirmed as originally intended in the conceptual model. Instead, seven new relational- and seven new organisational-based factors emerged, and where necessary these factors were renamed. The primary statistical procedure used to test the significance of the relationships hypothesised between the independent and dependent variables in this study, was Structural Equation Modelling (SEM). Owing to the sample-size restrictions, the conceptual model could not be subjected to SEM as a whole. Instead, seven submodels were identified and subjected to further analysis. The following independent variables were identified as influencing the dependent and intervening variables in this study: • Spousal relationship • Commitment to spouse • Equal status • Commitment to the business • Emotional attachment • Non-family involvement • Personal needs alignment • Leadership • Competencies • Internal context In order to investigate the influence of the various demographic variables on the intervening and dependent variables, an Analysis of Variance (ANOVA), Multiple Linear Regression analysis and t-tests were performed. How leadership occurs in a copreneurial business, the tenure of the business, the location of the business, the status of the copreneurship, the level of spousal involvement in the business and the vi number of employees were found to have an influence on the intervening and dependent variables of this study. By empirically investigating copreneurships, this study has added to the limited amount of family business literature on these complex partnerships. By way of the conceptual models developed in this study a significant contribution has been made towards understanding the factors influencing the success of copreneurships. As a result, this study presents recommendations and suggestions to assist couples in managing their copreneurships in such a way as to nurture their marriage relationships and at the same time enhance the performance of their businesses.
- Full Text:
- Date Issued: 2010
- Authors: Eybers, Carey
- Date: 2010
- Subjects: Couple-owned business enterprises , Family-owned business enterprises -- Succession -- South Africa , Entrepreneurship -- South Africa , Small business -- South Africa
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: vital:9285 , http://hdl.handle.net/10948/1207 , Couple-owned business enterprises , Family-owned business enterprises -- Succession -- South Africa , Entrepreneurship -- South Africa , Small business -- South Africa
- Description: Taking cognisance of the increasingly important role that copreneurial businesses play in national economies, the unique challenges that they face, and the lack of research attention given to such spousal teams, the purpose of this study was to contribute to the more effective functioning of copreneurships in South Africa by identifying the factors that impact on their success. Consequently, the primary objective of this study was to investigate the factors that influence the Perceived success of copreneurships in South Africa, as well as the conditions required for the effective and harmonious functioning of such spousal partnerships. This study seeks to incorporate previous findings and studies on team effectiveness and spousal relationships into a comprehensive conceptual model. After conducting a comprehensive literature study, as well as examining the different teamwork models proposed and the study by Farrington (2009), it became clear that successful teams have validated their proficiency with regard to two types of factors, namely, relational-based and organisational-based factors. Within these two categories of factors, 14 independent variables were identified and hypothesised to influence the measures of effectiveness of copreneurships, namely the dependent variable Perceived success; and the intervening variable Financial performance. All of the factors in this study were clearly defined and operationalised. Reliable and valid items sourced from Farrington’s (2009) measuring instrument, as well as several measuring instruments used in other studies, were used in the operationalisation of these factors. In addition, several items were self-generated from secondary sources. Respondents were identified using the convenience snowball sampling technique, and a structured questionnaire was made available to them. The data gathered from the 380 usable questionnaires was subjected to various statistical analyses. The validity and reliability of the measuring instrument was confirmed by means of an exploratory factor analysis, and Cronbach-alpha coefficients were calculated for this purpose. The original intervening variable Financial performance could not be confirmed as originally intended in the conceptual model. Instead, Financial performance split into v two separate variables which were named Financial performance and Growth performance. The original dependent variable Perceived success was confirmed by the factor analyses. The relational- and organisational-based factors could not be confirmed as originally intended in the conceptual model. Instead, seven new relational- and seven new organisational-based factors emerged, and where necessary these factors were renamed. The primary statistical procedure used to test the significance of the relationships hypothesised between the independent and dependent variables in this study, was Structural Equation Modelling (SEM). Owing to the sample-size restrictions, the conceptual model could not be subjected to SEM as a whole. Instead, seven submodels were identified and subjected to further analysis. The following independent variables were identified as influencing the dependent and intervening variables in this study: • Spousal relationship • Commitment to spouse • Equal status • Commitment to the business • Emotional attachment • Non-family involvement • Personal needs alignment • Leadership • Competencies • Internal context In order to investigate the influence of the various demographic variables on the intervening and dependent variables, an Analysis of Variance (ANOVA), Multiple Linear Regression analysis and t-tests were performed. How leadership occurs in a copreneurial business, the tenure of the business, the location of the business, the status of the copreneurship, the level of spousal involvement in the business and the vi number of employees were found to have an influence on the intervening and dependent variables of this study. By empirically investigating copreneurships, this study has added to the limited amount of family business literature on these complex partnerships. By way of the conceptual models developed in this study a significant contribution has been made towards understanding the factors influencing the success of copreneurships. As a result, this study presents recommendations and suggestions to assist couples in managing their copreneurships in such a way as to nurture their marriage relationships and at the same time enhance the performance of their businesses.
- Full Text:
- Date Issued: 2010
Critical reflections on the war on terrorism from an international human rights perspective
- Fabbriciani, Antonio Antonino
- Authors: Fabbriciani, Antonio Antonino
- Date: 2010
- Subjects: Human rights , War on Terrorism, 2001-2009 , Civil rights , International law
- Language: English
- Type: Thesis , Doctoral , DPhil
- Identifier: vital:9041 , http://hdl.handle.net/10948/1205 , Human rights , War on Terrorism, 2001-2009 , Civil rights , International law
- Description: This study explored the balancing out of the rights associated with terrorist and counter-terrorist attacks by using descriptive case studies of the US 9/11 attacks; and the counter-terrorist attacks on Afghanistan and Iraq. The research was conducted within a critical theory paradigm, drawing on the ideas of Habermas and other Critical Theorists. The research design was influenced by the securitive and ideological nature of the topic and it was decided that an extensive review of literature would be more suitable than a field study. A small number of interviews added to the richness of the data. Human rights, needs and international relations were investigated to serve as a theoretical starting-point for the study (Chapter 2). The case studies were subsequently explored against the background of this theoretical approach. This thesis therefore assessed the impact of human rights law on terrorism and counter-terrorism attacks under the Human Rights Act (1998). It considered how the provisions of the Human Rights Act have influenced the formulation and interpretation of anti-terrorism laws, and it examined the role of the judiciary in adjudicating disputes between the individual and the state. It further discussed human needs and the progress on human rights, terrorist attacks, as well as counter-terrorism attacks. Extensive data was gathered on the 9/11 attacks, and it was concluded that these attacks fall within the definition of crimes against humanity under international human rights jurisprudence. To bring about a truly secure world we must adopt a new paradigm that shifts priority to the security of the individuals and of communities to achieving human security, the honouring of human rights, and respect for the rule of law. This will obviously require a renewed commitment by all individuals and a shared sense of responsibility for all people, all over the world. What we need now is a major course correction – a new iii A. Fabbriciani approach which begins with a broader understanding of what defines human rights and the rule of law (Wilson, 2007). The study also focuses on counter-terrorist attacks in Afghanistan and Iraq (Chapters 3 and 4). It was shown that counter-terrorist attacks had an effect on the global economic system and development policies, which have been dominated by ideological strategies for many years. However, resistance has come from Islamic states, which have realised that new-liberal economic practices are incompatible with their theological and economic traditions. This has caused a situation to rethink global development programmes by political leaders, and to move away from new-liberal schemes towards true global development strategies. One of the main findings of the study was that the crimes of persecution and torture on the basis of political or religious views have been perpetrated by both parties, namely Al-Qaeda, and the US and its allies. It has been shown that the explored acts of terrorism and counter-attacks represent crimes against humanity, as defined by the relevant provisions of international law.
- Full Text:
- Date Issued: 2010
- Authors: Fabbriciani, Antonio Antonino
- Date: 2010
- Subjects: Human rights , War on Terrorism, 2001-2009 , Civil rights , International law
- Language: English
- Type: Thesis , Doctoral , DPhil
- Identifier: vital:9041 , http://hdl.handle.net/10948/1205 , Human rights , War on Terrorism, 2001-2009 , Civil rights , International law
- Description: This study explored the balancing out of the rights associated with terrorist and counter-terrorist attacks by using descriptive case studies of the US 9/11 attacks; and the counter-terrorist attacks on Afghanistan and Iraq. The research was conducted within a critical theory paradigm, drawing on the ideas of Habermas and other Critical Theorists. The research design was influenced by the securitive and ideological nature of the topic and it was decided that an extensive review of literature would be more suitable than a field study. A small number of interviews added to the richness of the data. Human rights, needs and international relations were investigated to serve as a theoretical starting-point for the study (Chapter 2). The case studies were subsequently explored against the background of this theoretical approach. This thesis therefore assessed the impact of human rights law on terrorism and counter-terrorism attacks under the Human Rights Act (1998). It considered how the provisions of the Human Rights Act have influenced the formulation and interpretation of anti-terrorism laws, and it examined the role of the judiciary in adjudicating disputes between the individual and the state. It further discussed human needs and the progress on human rights, terrorist attacks, as well as counter-terrorism attacks. Extensive data was gathered on the 9/11 attacks, and it was concluded that these attacks fall within the definition of crimes against humanity under international human rights jurisprudence. To bring about a truly secure world we must adopt a new paradigm that shifts priority to the security of the individuals and of communities to achieving human security, the honouring of human rights, and respect for the rule of law. This will obviously require a renewed commitment by all individuals and a shared sense of responsibility for all people, all over the world. What we need now is a major course correction – a new iii A. Fabbriciani approach which begins with a broader understanding of what defines human rights and the rule of law (Wilson, 2007). The study also focuses on counter-terrorist attacks in Afghanistan and Iraq (Chapters 3 and 4). It was shown that counter-terrorist attacks had an effect on the global economic system and development policies, which have been dominated by ideological strategies for many years. However, resistance has come from Islamic states, which have realised that new-liberal economic practices are incompatible with their theological and economic traditions. This has caused a situation to rethink global development programmes by political leaders, and to move away from new-liberal schemes towards true global development strategies. One of the main findings of the study was that the crimes of persecution and torture on the basis of political or religious views have been perpetrated by both parties, namely Al-Qaeda, and the US and its allies. It has been shown that the explored acts of terrorism and counter-attacks represent crimes against humanity, as defined by the relevant provisions of international law.
- Full Text:
- Date Issued: 2010
Spatial description of hake-directed fishing activity off the west coast of South Africa
- Fairweather, T P, Booth, Anthony J, Sauer, Warwick H H, Leslie, R W
- Authors: Fairweather, T P , Booth, Anthony J , Sauer, Warwick H H , Leslie, R W
- Date: 2010
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/127031 , vital:35945 , https://doi.10.2989/18142320609504129
- Description: Historically, the two species of Cape hakes Merluccius capensis and M. paradoxus off South Africa were commercially exploited exclusively by demersal trawling. In 1994, hake-directed demersal longline was introduced on an experimental basis, and in 1998 was initiated as a commercial fishing sector. The effect of a combined fleet composed of both trawlers and longliners on the Cape hake resource is not fully understood. Analysis of fishing intensity and catch-rate data revealed that the highest catch rates were found around the 400m and 500m isobaths for the trawl and longline fisheries respectively. Catch rates from both fishing sectors were also noted to be higher over sediments with a sand component. Differences between areas of the highest fishing intensity and highest catch rates were noted. In addition to other factors, it is suggested that a ‘friction of distance’ effect applies — vessels will trade-off higher catch rates with the increased costs associated with fishing in deeper waters.
- Full Text:
- Date Issued: 2010
- Authors: Fairweather, T P , Booth, Anthony J , Sauer, Warwick H H , Leslie, R W
- Date: 2010
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/127031 , vital:35945 , https://doi.10.2989/18142320609504129
- Description: Historically, the two species of Cape hakes Merluccius capensis and M. paradoxus off South Africa were commercially exploited exclusively by demersal trawling. In 1994, hake-directed demersal longline was introduced on an experimental basis, and in 1998 was initiated as a commercial fishing sector. The effect of a combined fleet composed of both trawlers and longliners on the Cape hake resource is not fully understood. Analysis of fishing intensity and catch-rate data revealed that the highest catch rates were found around the 400m and 500m isobaths for the trawl and longline fisheries respectively. Catch rates from both fishing sectors were also noted to be higher over sediments with a sand component. Differences between areas of the highest fishing intensity and highest catch rates were noted. In addition to other factors, it is suggested that a ‘friction of distance’ effect applies — vessels will trade-off higher catch rates with the increased costs associated with fishing in deeper waters.
- Full Text:
- Date Issued: 2010
Indicators of sustainable fishing for South African sardine Sardinops sagax and anchovy Engraulis encrasicolus
- Fairweather, T P, Van der Lingen, C D, Booth, Anthony J, Drapeau, L, Van Der Westhuizen, J J
- Authors: Fairweather, T P , Van der Lingen, C D , Booth, Anthony J , Drapeau, L , Van Der Westhuizen, J J
- Date: 2010
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/124778 , vital:35691 , https://doi.10.2989/18142320609504215
- Description: Six indicators were investigated for South African sardine Sardinops sagax and anchovy Engraulis encrasicolus: mean length of catch, length-at-50% maturity, total mortality, exploitation rate, ratio of bycatch, and centre of gravity of commercial catches. Sardine length-at-50% maturity is the most promising as a descriptive indicator because it is positively correlated with population size for an extensive time period (1953–2005). The remaining indicators were limited by shorter data-series (1984–2005). However, mean length of catch, ratio of bycatch and exploitation rate were found to be useful when considered in conjunction with other indicators. The centre of gravity of commercial sardine catches has shown a significant eastward shift from the West Coast, whereas that of anchovy has remained off that coast. Ratio of bycatch indicates that school composition is a reliable descriptive indicator of relative abundance in the two species. Fewer indicators for anchovy were useful, which is attributed to this species’ flexible life-history pattern.
- Full Text:
- Date Issued: 2010
- Authors: Fairweather, T P , Van der Lingen, C D , Booth, Anthony J , Drapeau, L , Van Der Westhuizen, J J
- Date: 2010
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/124778 , vital:35691 , https://doi.10.2989/18142320609504215
- Description: Six indicators were investigated for South African sardine Sardinops sagax and anchovy Engraulis encrasicolus: mean length of catch, length-at-50% maturity, total mortality, exploitation rate, ratio of bycatch, and centre of gravity of commercial catches. Sardine length-at-50% maturity is the most promising as a descriptive indicator because it is positively correlated with population size for an extensive time period (1953–2005). The remaining indicators were limited by shorter data-series (1984–2005). However, mean length of catch, ratio of bycatch and exploitation rate were found to be useful when considered in conjunction with other indicators. The centre of gravity of commercial sardine catches has shown a significant eastward shift from the West Coast, whereas that of anchovy has remained off that coast. Ratio of bycatch indicates that school composition is a reliable descriptive indicator of relative abundance in the two species. Fewer indicators for anchovy were useful, which is attributed to this species’ flexible life-history pattern.
- Full Text:
- Date Issued: 2010
Improving Productivity of Maize-based Smallholder Irrigated Cropping Systems: A Case Study of Zanyokwe Irrigation Scheme, Eastern Cape, South Africa
- Authors: Fanadzo, Morris
- Date: 2010
- Subjects: Farms, Small -- South Africa -- Eastern Cape Crop yields -- South Africa -- Eastern Cape Agricultural productivity -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10353/11009 , vital:36450
- Description: Smallholder irrigation schemes (SIS) in South Africa have performed poorly and failed to achieve the development objectives of sustaining rural livelihoods by increasing crop production and income. Limited knowledge of crop production among farmers is one constraint to improved crop productivity and, yet little research has been carried out to relate agronomic practices to productivity. This study was aimed at identifying strategies to improve the productivity of maize-based smallholder irrigated cropping systems in South Africa, using Zanyokwe irrigation scheme (ZIS) in the Eastern Cape Province as a case study. The research design was emergent, developed progressively as influenced by the progressive analyses that were made. The research work involved two main phases: exploratory studies and refinement on-farm experiments for testing technologies as informed by the exploratory studies. Exploratory studies were aimed at describing farmer crop production practices in major crop enterprises and identifying and prioritizing major agronomic yield constraints. Findings indicated that the overall performance of the cropping systems was poor as evidenced by low overall yields of < 25% of the potential in maize and butternut. Poor management of weeds, soil fertility, plant populations and water, late planting and poor cultivar choice were the most important yield constraints. The average cropping intensity achieved by farmers was only 48%. New hybrids yielded 50 - 65% higher grain than the cultivars commonly grown by farmers. However, farmers favoured their traditional cultivars, as they preferred green maize production as opposed to dry grains. As a result of these findings, focused research was designed on options for iii improving green maize production, soil fertility, crop stand and weed management in crop production. On-farm trials were, therefore, designed to (1) compare the response to nitrogen (N) rate of direct seeded and transplanted maize; (2) evaluate comparative performance of direct seeded and transplanted green maize under farmer management, and to work out the economics of transplanting; (3) investigate the effects of row spacing and atrazine dosage on weed dynamics maize yield; (4) determine the effects of inter-row spacing and plant population on weed dynamics and maize yield; and (5) investigate the effects of pre-plant weed control, N rate and plant population on weed dynamics and butternut yield. Maize transplanting improved crop stand, had earlier maturity and yielded higher at lower N rates compared to direct seeding for both green and grain maize. Total costs that varied were higher by R3 565 ha-1 for transplanted maize compared to direct-seeded maize, but the net benefits from transplanting were also much higher by R8 773 ha-1. Farmers favoured transplanting, citing bigger cobs, early maturity and the absence of seedling damage by birds, when maize was transplanted. However, a follow-up survey conducted during the subsequent year indicated that five of the six farmers abandoned transplanting, citing shortage of labour and high cost of commercially produced seedlings. It was concluded that transplanting is unlikely to be adopted unless the labour intensiveness of manual transplanting can be solved. Increasing atrazine dosage from a third of the label recommended dosage (LRD) and reducing row spacing from 90 to 45 cm resulted in an increase in weed mortality. A 100% kill of annual broadleaf weeds was possible while iv perennial grasses and the annual broadleaf weed, Oxalis latifolia, could not be controlled even at the LRD. However, improved weed mortality with increase in atrazine dosage and/or narrow rows did not translate into improved maize productivity. In butternut, pre-plant weed control resulted in a six-fold decrease in weed biomass and a 100% increase in fruit yield. These findings demonstrated the possibility of incorporation of reduced herbicide dosages and narrow rows to achieve adequate weed control and optimise on maize yields in smallholder farming systems. The results also suggested that pre-plant weed control is one of the pre-requisite to successful butternut production in SIS in South Africa. Increasing maize population from 40 000 to 60 000 plants ha-1 resulted in a 30% grain yield increase, but decreased length of cobs. Row spacing had no effect on maize yield at 40 000 plants ha-1, but at 60 000 plants ha-1 45 cm rows resulted in 11% higher grain yield (12 547 kg ha-1) than 90 cm rows (11 288 kg ha-1). Butternut yield increased significantly (p < 0.01) with increase in plant population and N rate. The optimum butternut population and N rate were estimated at 25 000 plants ha-1 and 120 kg N ha-1, respectively. Pre-plant weed control in butternut resulted in a six-fold decrease in weed biomass. Increasing butternut planting density from 10 000 to 30 000 plants ha-1 decreased weed biomass by 47%. No marketable fruits were obtained when planting was done without prior weed control. This result suggest that application of non-selective herbicide before planting is one technique that can be used by farmers as part of integrated weed management to give the crop a competitive advantage in the early growth stages before the plants start to produce vines. Yield increased significantly (p < 0.01) with increase in plant density and N rate. The optimum plant density and N rate were estimated at 25 000 plants ha-1 and 120 kg N ha-1, respectively. These findings emphasise the need to take into consideration production practices by farmers as a basis to build up skills in the management of crop enterprises and the farm as a viable business in any efforts to improve on the performance of SIS in South Africa. Future research should concentrate on labour-saving sustainable production technologies for SIS in South Africa.
- Full Text:
- Date Issued: 2010
- Authors: Fanadzo, Morris
- Date: 2010
- Subjects: Farms, Small -- South Africa -- Eastern Cape Crop yields -- South Africa -- Eastern Cape Agricultural productivity -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10353/11009 , vital:36450
- Description: Smallholder irrigation schemes (SIS) in South Africa have performed poorly and failed to achieve the development objectives of sustaining rural livelihoods by increasing crop production and income. Limited knowledge of crop production among farmers is one constraint to improved crop productivity and, yet little research has been carried out to relate agronomic practices to productivity. This study was aimed at identifying strategies to improve the productivity of maize-based smallholder irrigated cropping systems in South Africa, using Zanyokwe irrigation scheme (ZIS) in the Eastern Cape Province as a case study. The research design was emergent, developed progressively as influenced by the progressive analyses that were made. The research work involved two main phases: exploratory studies and refinement on-farm experiments for testing technologies as informed by the exploratory studies. Exploratory studies were aimed at describing farmer crop production practices in major crop enterprises and identifying and prioritizing major agronomic yield constraints. Findings indicated that the overall performance of the cropping systems was poor as evidenced by low overall yields of < 25% of the potential in maize and butternut. Poor management of weeds, soil fertility, plant populations and water, late planting and poor cultivar choice were the most important yield constraints. The average cropping intensity achieved by farmers was only 48%. New hybrids yielded 50 - 65% higher grain than the cultivars commonly grown by farmers. However, farmers favoured their traditional cultivars, as they preferred green maize production as opposed to dry grains. As a result of these findings, focused research was designed on options for iii improving green maize production, soil fertility, crop stand and weed management in crop production. On-farm trials were, therefore, designed to (1) compare the response to nitrogen (N) rate of direct seeded and transplanted maize; (2) evaluate comparative performance of direct seeded and transplanted green maize under farmer management, and to work out the economics of transplanting; (3) investigate the effects of row spacing and atrazine dosage on weed dynamics maize yield; (4) determine the effects of inter-row spacing and plant population on weed dynamics and maize yield; and (5) investigate the effects of pre-plant weed control, N rate and plant population on weed dynamics and butternut yield. Maize transplanting improved crop stand, had earlier maturity and yielded higher at lower N rates compared to direct seeding for both green and grain maize. Total costs that varied were higher by R3 565 ha-1 for transplanted maize compared to direct-seeded maize, but the net benefits from transplanting were also much higher by R8 773 ha-1. Farmers favoured transplanting, citing bigger cobs, early maturity and the absence of seedling damage by birds, when maize was transplanted. However, a follow-up survey conducted during the subsequent year indicated that five of the six farmers abandoned transplanting, citing shortage of labour and high cost of commercially produced seedlings. It was concluded that transplanting is unlikely to be adopted unless the labour intensiveness of manual transplanting can be solved. Increasing atrazine dosage from a third of the label recommended dosage (LRD) and reducing row spacing from 90 to 45 cm resulted in an increase in weed mortality. A 100% kill of annual broadleaf weeds was possible while iv perennial grasses and the annual broadleaf weed, Oxalis latifolia, could not be controlled even at the LRD. However, improved weed mortality with increase in atrazine dosage and/or narrow rows did not translate into improved maize productivity. In butternut, pre-plant weed control resulted in a six-fold decrease in weed biomass and a 100% increase in fruit yield. These findings demonstrated the possibility of incorporation of reduced herbicide dosages and narrow rows to achieve adequate weed control and optimise on maize yields in smallholder farming systems. The results also suggested that pre-plant weed control is one of the pre-requisite to successful butternut production in SIS in South Africa. Increasing maize population from 40 000 to 60 000 plants ha-1 resulted in a 30% grain yield increase, but decreased length of cobs. Row spacing had no effect on maize yield at 40 000 plants ha-1, but at 60 000 plants ha-1 45 cm rows resulted in 11% higher grain yield (12 547 kg ha-1) than 90 cm rows (11 288 kg ha-1). Butternut yield increased significantly (p < 0.01) with increase in plant population and N rate. The optimum butternut population and N rate were estimated at 25 000 plants ha-1 and 120 kg N ha-1, respectively. Pre-plant weed control in butternut resulted in a six-fold decrease in weed biomass. Increasing butternut planting density from 10 000 to 30 000 plants ha-1 decreased weed biomass by 47%. No marketable fruits were obtained when planting was done without prior weed control. This result suggest that application of non-selective herbicide before planting is one technique that can be used by farmers as part of integrated weed management to give the crop a competitive advantage in the early growth stages before the plants start to produce vines. Yield increased significantly (p < 0.01) with increase in plant density and N rate. The optimum plant density and N rate were estimated at 25 000 plants ha-1 and 120 kg N ha-1, respectively. These findings emphasise the need to take into consideration production practices by farmers as a basis to build up skills in the management of crop enterprises and the farm as a viable business in any efforts to improve on the performance of SIS in South Africa. Future research should concentrate on labour-saving sustainable production technologies for SIS in South Africa.
- Full Text:
- Date Issued: 2010
The role of governance: family owned butchery
- Authors: Farndell, Mark
- Date: 2010
- Subjects: Family-owned business enterprises -- South Africa , Family-owned business enterprises -- Management , Family-owned business enterprises -- Succession , Corporate governance -- South Africa
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: vital:8588 , http://hdl.handle.net/10948/1509 , Family-owned business enterprises -- South Africa , Family-owned business enterprises -- Management , Family-owned business enterprises -- Succession , Corporate governance -- South Africa
- Description: The importance of SME family businesses is evident in society. Coming out of a recession, the innovation, labour absorption and employment creation capabilities of SMEs and family businesses globally, and in emerging economies with high levels of unemployment and poverty, is incredibly important for environmental sustainability and societal harmony. Good governance is empirically proven to improve long-term sustainability of organisations, and poor governance is linked to the demise of many businesses – large and small, family and non-family businesses alike. This research, by means of a thorough literature review of family business and governance, and a single in-depth case study, identifies the components of SME family business governance in a contextual setting in South Africa. The literature review defines SMEs, family businesses and corporate governance. It reviews the nuances of family businesses that make them distinctive from non-family businesses, the models of family businesses that have been developed over time, the approaches to corporate governance, corporate governance codes of conduct, and family business governance models, as well as the components and dynamics of family business governance. The qualitative case study approach adopted enables the in depth contextual identification and exploration of the dynamics of family business governance. Empirical data collected from interviews, observations and reports are analysed using triangulation and pattern matching logic to ensure validity and reliability. Empirical findings are discussed with reference to the literary research findings, integrating literary and empirical findings, and resulting in the development of a conceptual model of family business governance, an SME family business governance structures model, and an SME family business authority delegation model. Governance is defined as the manifestation of the intent of the founder/owners of the business. Governance is manifest in structures, strategies, policies, procedures, relationships and performance. The reciprocity of transfers and outputs between the family business systems, the family business and its contextual environment is reflected in the performance of the business; which in turn is a reflection of the governance of the family and the family business. The study concludes with the importance of the family and its cohesion and harmony, and the impact it has on synergy, unity and harmony in the business. The study also finds that governance is strategic leadership, and that efficient and effective governance leads to synergies between the family, the family business and its contextual environment that when harnessed and directed towards a vision, can produce unimitable competitive advantages for the family firm.
- Full Text:
- Date Issued: 2010
- Authors: Farndell, Mark
- Date: 2010
- Subjects: Family-owned business enterprises -- South Africa , Family-owned business enterprises -- Management , Family-owned business enterprises -- Succession , Corporate governance -- South Africa
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: vital:8588 , http://hdl.handle.net/10948/1509 , Family-owned business enterprises -- South Africa , Family-owned business enterprises -- Management , Family-owned business enterprises -- Succession , Corporate governance -- South Africa
- Description: The importance of SME family businesses is evident in society. Coming out of a recession, the innovation, labour absorption and employment creation capabilities of SMEs and family businesses globally, and in emerging economies with high levels of unemployment and poverty, is incredibly important for environmental sustainability and societal harmony. Good governance is empirically proven to improve long-term sustainability of organisations, and poor governance is linked to the demise of many businesses – large and small, family and non-family businesses alike. This research, by means of a thorough literature review of family business and governance, and a single in-depth case study, identifies the components of SME family business governance in a contextual setting in South Africa. The literature review defines SMEs, family businesses and corporate governance. It reviews the nuances of family businesses that make them distinctive from non-family businesses, the models of family businesses that have been developed over time, the approaches to corporate governance, corporate governance codes of conduct, and family business governance models, as well as the components and dynamics of family business governance. The qualitative case study approach adopted enables the in depth contextual identification and exploration of the dynamics of family business governance. Empirical data collected from interviews, observations and reports are analysed using triangulation and pattern matching logic to ensure validity and reliability. Empirical findings are discussed with reference to the literary research findings, integrating literary and empirical findings, and resulting in the development of a conceptual model of family business governance, an SME family business governance structures model, and an SME family business authority delegation model. Governance is defined as the manifestation of the intent of the founder/owners of the business. Governance is manifest in structures, strategies, policies, procedures, relationships and performance. The reciprocity of transfers and outputs between the family business systems, the family business and its contextual environment is reflected in the performance of the business; which in turn is a reflection of the governance of the family and the family business. The study concludes with the importance of the family and its cohesion and harmony, and the impact it has on synergy, unity and harmony in the business. The study also finds that governance is strategic leadership, and that efficient and effective governance leads to synergies between the family, the family business and its contextual environment that when harnessed and directed towards a vision, can produce unimitable competitive advantages for the family firm.
- Full Text:
- Date Issued: 2010