Improved endoglucanase production and mycelial biomass of some ericoid fungi
- Adeoyo, Olusegun R, Pletschke, Brett I, Dames, Joanna F
- Authors: Adeoyo, Olusegun R , Pletschke, Brett I , Dames, Joanna F
- Date: 2017
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/440352 , vital:73776 , https://doi.org/10.1186/s13568-016-0312-y
- Description: Fungal species associated with ericaceous plant roots produce a number of enzymes and other bio-active metabolites in order to enhance survival of their host plants in natural environments. This study focussed on endoglucanase production from root associated ericoid mycorrhizal and dark septate endophytic fungal isolates. Out of the five fungal isolates screened, Leohumicola sp. (ChemRU330/PPRI 13195) had the highest relative enzyme activity and was tested along with isolates belonging to Hyloscyphaceae (EdRU083/PPRI 17284) and Leotiomycetes (EdRU002/PPRI 17261) for endoglucanase production under different pH and nutritional conditions that included: carbon sources, nitrogen sources and metal ions, at an optimum temperature of 28 °C. An optimal of pH 5.0 produced enzyme activity of 3.99, 2.18 and 4.31 (U/mg protein) for isolates EdRU083, EdRU002 and Leohumicola sp. respectively. Increased enzyme activities and improved mycelial biomass production were obtained in the presence of supplements such as potassium, sodium, glucose, maltose, cellobiose, tryptone and peptone. While NaFe-EDTA and Co2+ inhibited enzyme activity. The potential role of these fungi as a source of novel enzymes is an ongoing objective of this study.
- Full Text:
- Date Issued: 2017
- Authors: Adeoyo, Olusegun R , Pletschke, Brett I , Dames, Joanna F
- Date: 2017
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/440352 , vital:73776 , https://doi.org/10.1186/s13568-016-0312-y
- Description: Fungal species associated with ericaceous plant roots produce a number of enzymes and other bio-active metabolites in order to enhance survival of their host plants in natural environments. This study focussed on endoglucanase production from root associated ericoid mycorrhizal and dark septate endophytic fungal isolates. Out of the five fungal isolates screened, Leohumicola sp. (ChemRU330/PPRI 13195) had the highest relative enzyme activity and was tested along with isolates belonging to Hyloscyphaceae (EdRU083/PPRI 17284) and Leotiomycetes (EdRU002/PPRI 17261) for endoglucanase production under different pH and nutritional conditions that included: carbon sources, nitrogen sources and metal ions, at an optimum temperature of 28 °C. An optimal of pH 5.0 produced enzyme activity of 3.99, 2.18 and 4.31 (U/mg protein) for isolates EdRU083, EdRU002 and Leohumicola sp. respectively. Increased enzyme activities and improved mycelial biomass production were obtained in the presence of supplements such as potassium, sodium, glucose, maltose, cellobiose, tryptone and peptone. While NaFe-EDTA and Co2+ inhibited enzyme activity. The potential role of these fungi as a source of novel enzymes is an ongoing objective of this study.
- Full Text:
- Date Issued: 2017
Improved nonlinear optical behaviour of ball type indium (III) phthalocyanine linked to glutathione capped nanoparticles
- Nwaji, Njemuwa, Oluwole, David O, Mack, John, Louzada, Marcel, Khene, Samson M, Britton, Jonathan, Nyokong, Tebello
- Authors: Nwaji, Njemuwa , Oluwole, David O , Mack, John , Louzada, Marcel , Khene, Samson M , Britton, Jonathan , Nyokong, Tebello
- Date: 2017
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/239654 , vital:50752 , xlink:href="https://doi.org/10.1016/j.dyepig.2017.01.066"
- Description: The synthesis of ball–type indium phthalocyanine (complex 4) and its covalent attachment to glutathione (GSH–) capped (Ag, Au, CdTeSe, CdTeSe/ZnO) nanoparticles are reported in this work. Furthermore, their photophysical and nonlinear optical behaviour were investigated. We observed a decrease in the fluorescence quantum yield with corresponding increase in the triplet quantum yield of the nanoconjugates in comparison to complex 4 alone. The reverse saturable absorption was found to be dependent on excited state absorption. The optical limiting threshold ranges from 0.40–0.78 (J/cm2). The nanoconjugate of the complex 4 with GSH–CdTeSe/ZnO (QD1) accounted for the most improved triplet state parameters and nonlinear optical behaviour in comparison to complex 4 and the other nanoconjugates studied in this work.
- Full Text:
- Date Issued: 2017
- Authors: Nwaji, Njemuwa , Oluwole, David O , Mack, John , Louzada, Marcel , Khene, Samson M , Britton, Jonathan , Nyokong, Tebello
- Date: 2017
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/239654 , vital:50752 , xlink:href="https://doi.org/10.1016/j.dyepig.2017.01.066"
- Description: The synthesis of ball–type indium phthalocyanine (complex 4) and its covalent attachment to glutathione (GSH–) capped (Ag, Au, CdTeSe, CdTeSe/ZnO) nanoparticles are reported in this work. Furthermore, their photophysical and nonlinear optical behaviour were investigated. We observed a decrease in the fluorescence quantum yield with corresponding increase in the triplet quantum yield of the nanoconjugates in comparison to complex 4 alone. The reverse saturable absorption was found to be dependent on excited state absorption. The optical limiting threshold ranges from 0.40–0.78 (J/cm2). The nanoconjugate of the complex 4 with GSH–CdTeSe/ZnO (QD1) accounted for the most improved triplet state parameters and nonlinear optical behaviour in comparison to complex 4 and the other nanoconjugates studied in this work.
- Full Text:
- Date Issued: 2017
Improved photocatalytic degradation of Orange G using hybrid nanofibers
- Ledwaba, Mpho, Masilela, Nkosiphile, Nyokong, Tebello, Antunes, Edith M
- Authors: Ledwaba, Mpho , Masilela, Nkosiphile , Nyokong, Tebello , Antunes, Edith M
- Date: 2017
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/239632 , vital:50750 , xlink:href="https://doi.org/10.1007/s11051-017-3853-3"
- Description: Functionalised electrospun polyamide-6 (PA-6) nanofibres incorporating gadolinium oxide nanoparticles conjugated to zinc tetracarboxyphenoxy phthalocyanine (ZnTCPPc) as the sensitizer were prepared for the photocatalytic degradation of Orange G. Fibres incorporating the phthalocyanine alone or a mixture of the nanoparticles and phthalocyanine were also generated. The singlet oxygen-generating ability of the sensitizer was shown to be maintained within the fibre mat, with the singlet oxygen quantum yields increasing upon incorporation of the magnetic nanoparticles. Consequently, the rate of the photodegradation of Orange G was observed to increase with an increase in singlet oxygen quantum yield. A reduction in the half-lives for the functionalised nanofibres was recorded in the presence of the magnetic nanoparticles, indicating an improvement in the efficiency of the degradation process.
- Full Text:
- Date Issued: 2017
- Authors: Ledwaba, Mpho , Masilela, Nkosiphile , Nyokong, Tebello , Antunes, Edith M
- Date: 2017
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/239632 , vital:50750 , xlink:href="https://doi.org/10.1007/s11051-017-3853-3"
- Description: Functionalised electrospun polyamide-6 (PA-6) nanofibres incorporating gadolinium oxide nanoparticles conjugated to zinc tetracarboxyphenoxy phthalocyanine (ZnTCPPc) as the sensitizer were prepared for the photocatalytic degradation of Orange G. Fibres incorporating the phthalocyanine alone or a mixture of the nanoparticles and phthalocyanine were also generated. The singlet oxygen-generating ability of the sensitizer was shown to be maintained within the fibre mat, with the singlet oxygen quantum yields increasing upon incorporation of the magnetic nanoparticles. Consequently, the rate of the photodegradation of Orange G was observed to increase with an increase in singlet oxygen quantum yield. A reduction in the half-lives for the functionalised nanofibres was recorded in the presence of the magnetic nanoparticles, indicating an improvement in the efficiency of the degradation process.
- Full Text:
- Date Issued: 2017
Improvement of the pharmacological activity of menthol via enzymatic β-anomer-selective glycosylation
- Choi, Ha-Young, Kim, Bo-Min, Morgan, Abubaker M A, Kim, Joong Su, Kim, Won-Gon
- Authors: Choi, Ha-Young , Kim, Bo-Min , Morgan, Abubaker M A , Kim, Joong Su , Kim, Won-Gon
- Date: 2017
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/67515 , vital:29106 , http://dx.doi.org/10.1186/s13568-017-0468-0
- Description: Publisher version , Menthol has a considerable cooling effect, but the use range of menthol is limited because of its extremely low solubility in water and inherent flavor. (−)-Menthol β-glucoside was determined to be more soluble in water (>27 times) than (−)-menthol α-glucoside; hence, β-anomer-selective glucosylation of menthol is necessary. The in vitro glycosylation of (−)-menthol by uridine diphosphate glycosyltransferase (BLC) from Bacillus licheniformis generated (−)-menthol β-glucoside and new (−)-menthol β-galactoside and (−)-menthol N-acetylglucosamine. The maximum conversion rate of menthol to (−)-menthol β-D-glucoside by BLC was found to be 58.9%. Importantly, (−)-menthol β-D-glucoside had a higher cooling effect and no flavor compared with menthol. In addition, (−)-menthol β-D-glucoside was determined to be a non-sensitizer in a skin allergy test in the human cell line activation test, whereas menthol was a sensitizer.
- Full Text:
- Date Issued: 2017
- Authors: Choi, Ha-Young , Kim, Bo-Min , Morgan, Abubaker M A , Kim, Joong Su , Kim, Won-Gon
- Date: 2017
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/67515 , vital:29106 , http://dx.doi.org/10.1186/s13568-017-0468-0
- Description: Publisher version , Menthol has a considerable cooling effect, but the use range of menthol is limited because of its extremely low solubility in water and inherent flavor. (−)-Menthol β-glucoside was determined to be more soluble in water (>27 times) than (−)-menthol α-glucoside; hence, β-anomer-selective glucosylation of menthol is necessary. The in vitro glycosylation of (−)-menthol by uridine diphosphate glycosyltransferase (BLC) from Bacillus licheniformis generated (−)-menthol β-glucoside and new (−)-menthol β-galactoside and (−)-menthol N-acetylglucosamine. The maximum conversion rate of menthol to (−)-menthol β-D-glucoside by BLC was found to be 58.9%. Importantly, (−)-menthol β-D-glucoside had a higher cooling effect and no flavor compared with menthol. In addition, (−)-menthol β-D-glucoside was determined to be a non-sensitizer in a skin allergy test in the human cell line activation test, whereas menthol was a sensitizer.
- Full Text:
- Date Issued: 2017
Improving financial risk management in the petroleum industry of Nigeria
- Authors: Ogulu, Christiana
- Date: 2017
- Subjects: Financial risk management -- Nigeria , Risk management -- Nigeria Petroleum industry and trade -- Nigeria Nigeria -- Economic conditions -- 21st century
- Language: English
- Type: Thesis , Doctoral , DBA
- Identifier: http://hdl.handle.net/10948/19806 , vital:28974
- Description: Petroleum companies are critical to the Nigerian economy, as the petroleum sector is the biggest earner and spender of foreign exchange and the highest employer of labour. The industry is however faced with challenges of unprecedented fluctuation of commodity prices, exchange rates, a series of divestments, host communities’ demands, oil theft, project shelving, and destruction of infrastructure. Workforce cutting and consolidations are also the order of the day and current financial risk management (FRM) systems in companies appear not to be working. FRM systems in Nigerian petroleum companies have failed because risk managers did not have one generally accepted framework to manage financial risks such as fluctuations in commodity prices, exchange rates, interest rates, and in the demand and supply of crude oil and gas. There was a need for an integrated framework that is more descriptive and that does not rely only on mathematical models, separate management of each financial risk, and specific focus on the downside risk and derivatives. Mathematical models have presented weaknesses in the identification of issues, dissemination of information, policy formulation, planning, type and the institution of risk culture or delimitation of authority and in responsibility through the organisational structure. Mathematical models could not fully reduce the identification, communication, structure, and environmental scanning of FRM to mathematical models. The present study was the first attempt at an FRM framework that integrated all the financial risks strategically and took into consideration all the critical success factors that can solve the problems and challenges facing the Nigerian petroleum companies in the long term. The primary objective of the study was therefore to develop an FRM framework for the petroleum industry of Nigeria. The study collected data using a mixed methods approach to generate quantitative and qualitative data regarding financial risks facing the petroleum industry and possible methods of managing these risks effectively. The final sample consisted of 70 top-, middle- and lower-level managers, as well as five experts in the industry. Questionnaires were administered to practitioners in the south-eastern and south-western regions of Nigeria, and semi-structured interviews were conducted with financial risk management experts in the petroleum industry. Descriptive and inferential statistics were used in analysing the data. The study succeeded in developing a framework that: provides a thorough understanding and proper evaluation of the most important financial risks petroleum companies face; identifies the type and extent of top management support needed in a strategic FRM system; identifies and operationalises the financial risk culture that should be fostered to achieve FRM success; identifies the organisational structure that supports the successful achievement of FRM; identifies and operationalises the organisation communication flow that supports the successful achievement of FRM; identifies and operationalises oversight and control to support the successful achievement of FRM; and specifies the amount of training that supports the successful achievement of FRM. By implementing this framework, petroleum organisations in Nigeria will go a long way in successfully managing financial risks in that industry.
- Full Text:
- Date Issued: 2017
- Authors: Ogulu, Christiana
- Date: 2017
- Subjects: Financial risk management -- Nigeria , Risk management -- Nigeria Petroleum industry and trade -- Nigeria Nigeria -- Economic conditions -- 21st century
- Language: English
- Type: Thesis , Doctoral , DBA
- Identifier: http://hdl.handle.net/10948/19806 , vital:28974
- Description: Petroleum companies are critical to the Nigerian economy, as the petroleum sector is the biggest earner and spender of foreign exchange and the highest employer of labour. The industry is however faced with challenges of unprecedented fluctuation of commodity prices, exchange rates, a series of divestments, host communities’ demands, oil theft, project shelving, and destruction of infrastructure. Workforce cutting and consolidations are also the order of the day and current financial risk management (FRM) systems in companies appear not to be working. FRM systems in Nigerian petroleum companies have failed because risk managers did not have one generally accepted framework to manage financial risks such as fluctuations in commodity prices, exchange rates, interest rates, and in the demand and supply of crude oil and gas. There was a need for an integrated framework that is more descriptive and that does not rely only on mathematical models, separate management of each financial risk, and specific focus on the downside risk and derivatives. Mathematical models have presented weaknesses in the identification of issues, dissemination of information, policy formulation, planning, type and the institution of risk culture or delimitation of authority and in responsibility through the organisational structure. Mathematical models could not fully reduce the identification, communication, structure, and environmental scanning of FRM to mathematical models. The present study was the first attempt at an FRM framework that integrated all the financial risks strategically and took into consideration all the critical success factors that can solve the problems and challenges facing the Nigerian petroleum companies in the long term. The primary objective of the study was therefore to develop an FRM framework for the petroleum industry of Nigeria. The study collected data using a mixed methods approach to generate quantitative and qualitative data regarding financial risks facing the petroleum industry and possible methods of managing these risks effectively. The final sample consisted of 70 top-, middle- and lower-level managers, as well as five experts in the industry. Questionnaires were administered to practitioners in the south-eastern and south-western regions of Nigeria, and semi-structured interviews were conducted with financial risk management experts in the petroleum industry. Descriptive and inferential statistics were used in analysing the data. The study succeeded in developing a framework that: provides a thorough understanding and proper evaluation of the most important financial risks petroleum companies face; identifies the type and extent of top management support needed in a strategic FRM system; identifies and operationalises the financial risk culture that should be fostered to achieve FRM success; identifies the organisational structure that supports the successful achievement of FRM; identifies and operationalises the organisation communication flow that supports the successful achievement of FRM; identifies and operationalises oversight and control to support the successful achievement of FRM; and specifies the amount of training that supports the successful achievement of FRM. By implementing this framework, petroleum organisations in Nigeria will go a long way in successfully managing financial risks in that industry.
- Full Text:
- Date Issued: 2017
Improving fold resistance prediction of HIV-1 against protease and reverse transcriptase inhibitors using artificial neural networks:
- Sheik Amamuddy, Olivier, Bishop, Nigel T, Tastan Bishop, Özlem
- Authors: Sheik Amamuddy, Olivier , Bishop, Nigel T , Tastan Bishop, Özlem
- Date: 2017
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/148261 , vital:38724 , https://0-doi.org.wam.seals.ac.za/10.1186/s12859-017-1782-x
- Description: Drug resistance in HIV treatment is still a worldwide problem. Predicting resistance to antiretrovirals (ARVs) before starting any treatment is important. Prediction accuracy is essential, as low-accuracy predictions increase the risk of prescribing sub-optimal drug regimens leading to patients developing resistance sooner. Artificial Neural Networks (ANNs) are a powerful tool that would be able to assist in drug resistance prediction. In this study, we constrained the dataset to subtype B, sacrificing generalizability for a higher predictive performance, and demonstrated that the predictive quality of the ANN regression models have definite improvement for most ARVs.
- Full Text:
- Date Issued: 2017
- Authors: Sheik Amamuddy, Olivier , Bishop, Nigel T , Tastan Bishop, Özlem
- Date: 2017
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/148261 , vital:38724 , https://0-doi.org.wam.seals.ac.za/10.1186/s12859-017-1782-x
- Description: Drug resistance in HIV treatment is still a worldwide problem. Predicting resistance to antiretrovirals (ARVs) before starting any treatment is important. Prediction accuracy is essential, as low-accuracy predictions increase the risk of prescribing sub-optimal drug regimens leading to patients developing resistance sooner. Artificial Neural Networks (ANNs) are a powerful tool that would be able to assist in drug resistance prediction. In this study, we constrained the dataset to subtype B, sacrificing generalizability for a higher predictive performance, and demonstrated that the predictive quality of the ANN regression models have definite improvement for most ARVs.
- Full Text:
- Date Issued: 2017
Improving revenue management at the Nelson Mandela Bay Municipality through customer relationship management
- Authors: Nogqala, Mbuzeli
- Date: 2017
- Subjects: Revenue management -- South Africa -- Nelson Mandela Bay Municipality Customer relations -- South Africa -- Nelson Mandela Bay Municipality -- Management
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: http://hdl.handle.net/10948/20191 , vital:29155
- Description: In South Africa, local government as represented by a number of municipalities, is at the coal-face of service delivery. As such, the effect of community displeasure with poor service delivery is usually directed at this sphere of government. To maintain and develop infrastructure such as roads and electricity, municipalities are dependent on financial grants allocated by the national government. Notably, in the main, municipalities are required to maximise their own sources of revenue in order to render the requisite operational services/activities. Inevitably, municipal budgets are usually not sufficient to meet the unlimited service delivery obligations required by the local communities. The Nelson Mandela Bay Municipality (NMBM) is not immune to these interconnected revenue generation and service delivery priorities. The primary objective of the study is to establish an effective CRM framework that may enhance revenue collection at the NMBM. More specifically, the study investigates the nature of Customer Relationship Management (CRM) at the NMBM, factors that are responsible for ineffective CRM at the NMBM, the impacts of ineffective CRM on revenue collection at the municipality and the ways in which a CRM framework suitable to improve revenue collection at the NMBM can be established. Purposive sampling was used to select a sample of 130 respondents from a population of 420 employees in the Revenue Management and Customer Care Sub-directorate of the municipality. In view of the primary objective of the study, participants were drawn from relevant divisions such as, customer care, debtor management, rates and valuations, billing coordination and receipting. Of 130 questionnaires distributed, only 121 usable questionnaires were returned. This translates to a response rate of 93%. The empirical results reveal that there is a positive relationship between CRM and revenue management. In addition to this, the empirical results show that there is a positive relationship between customer satisfaction, customer engagement, customer value, customer experience, service standards and CRM. Furthermore, the findings of the study show that more needs to be done, as very little has been achieved by the NMBM in the context of implementing measures to enhance CRM. In this regard, the study provides managerial and future research recommendations.
- Full Text:
- Date Issued: 2017
- Authors: Nogqala, Mbuzeli
- Date: 2017
- Subjects: Revenue management -- South Africa -- Nelson Mandela Bay Municipality Customer relations -- South Africa -- Nelson Mandela Bay Municipality -- Management
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: http://hdl.handle.net/10948/20191 , vital:29155
- Description: In South Africa, local government as represented by a number of municipalities, is at the coal-face of service delivery. As such, the effect of community displeasure with poor service delivery is usually directed at this sphere of government. To maintain and develop infrastructure such as roads and electricity, municipalities are dependent on financial grants allocated by the national government. Notably, in the main, municipalities are required to maximise their own sources of revenue in order to render the requisite operational services/activities. Inevitably, municipal budgets are usually not sufficient to meet the unlimited service delivery obligations required by the local communities. The Nelson Mandela Bay Municipality (NMBM) is not immune to these interconnected revenue generation and service delivery priorities. The primary objective of the study is to establish an effective CRM framework that may enhance revenue collection at the NMBM. More specifically, the study investigates the nature of Customer Relationship Management (CRM) at the NMBM, factors that are responsible for ineffective CRM at the NMBM, the impacts of ineffective CRM on revenue collection at the municipality and the ways in which a CRM framework suitable to improve revenue collection at the NMBM can be established. Purposive sampling was used to select a sample of 130 respondents from a population of 420 employees in the Revenue Management and Customer Care Sub-directorate of the municipality. In view of the primary objective of the study, participants were drawn from relevant divisions such as, customer care, debtor management, rates and valuations, billing coordination and receipting. Of 130 questionnaires distributed, only 121 usable questionnaires were returned. This translates to a response rate of 93%. The empirical results reveal that there is a positive relationship between CRM and revenue management. In addition to this, the empirical results show that there is a positive relationship between customer satisfaction, customer engagement, customer value, customer experience, service standards and CRM. Furthermore, the findings of the study show that more needs to be done, as very little has been achieved by the NMBM in the context of implementing measures to enhance CRM. In this regard, the study provides managerial and future research recommendations.
- Full Text:
- Date Issued: 2017
Improving singlet oxygen generating abilities of phthalocyanines
- Nwahara, Nnamdi, Britton, Jonathan, Nyokong, Tebello
- Authors: Nwahara, Nnamdi , Britton, Jonathan , Nyokong, Tebello
- Date: 2017
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/188943 , vital:44800 , xlink:href="https://doi.org/10.1080/00958972.2017.1313975"
- Description: Glutathione-capped graphene quantum dots (GQDs@GSH) were covalently linked to folic acid (FA). Aluminum tetrasulfonated phthalocyanine (ClAlTSPc) was then adsorbed on the GQDs@GSH-FA conjugate to form GQDs@GSH-FA/ClAlTSPc or on GQDs@GSH and pristine GQDs alone to form GQDs@GSH/ClAlTSPc and GQDs/ClAlTSPc, respectively. We report for the first time on the photophysicochemical behavior of the resulting nanoconjugates. The fluorescence quantum yields of pristine GQDs, GQDS@GSH, or GQDs@GSH-FA conjugate were quenched upon non-covalent interaction (π–π) with ClAlTSPc. There was an increase in triplet quantum yields from 0.38 for ClAlTSPc alone to 0.60, 0.75, and 0.73 when ClAlTSPc was linked to pristine GQDs, GQDs@GSH, and GQDs@GSH-FA, respectively. The singlet oxygen quantum yields also increased from 0.37 for ClAlTSPc alone to 0.42 (for ClALTSPc with pristine GQDs), 0.52 (for ClAlTSPc with GQDs@GSH), and 0.54 (for ClAlTSPc with GQDs@GSH-FA). Thus, the present work may lead to a new generation of carbon-based nanomaterial photodynamic therapy agents with overall performance superior to conventional agents in terms of singlet oxygen generation, water dispersibility, and biocompatibility.
- Full Text:
- Date Issued: 2017
- Authors: Nwahara, Nnamdi , Britton, Jonathan , Nyokong, Tebello
- Date: 2017
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/188943 , vital:44800 , xlink:href="https://doi.org/10.1080/00958972.2017.1313975"
- Description: Glutathione-capped graphene quantum dots (GQDs@GSH) were covalently linked to folic acid (FA). Aluminum tetrasulfonated phthalocyanine (ClAlTSPc) was then adsorbed on the GQDs@GSH-FA conjugate to form GQDs@GSH-FA/ClAlTSPc or on GQDs@GSH and pristine GQDs alone to form GQDs@GSH/ClAlTSPc and GQDs/ClAlTSPc, respectively. We report for the first time on the photophysicochemical behavior of the resulting nanoconjugates. The fluorescence quantum yields of pristine GQDs, GQDS@GSH, or GQDs@GSH-FA conjugate were quenched upon non-covalent interaction (π–π) with ClAlTSPc. There was an increase in triplet quantum yields from 0.38 for ClAlTSPc alone to 0.60, 0.75, and 0.73 when ClAlTSPc was linked to pristine GQDs, GQDs@GSH, and GQDs@GSH-FA, respectively. The singlet oxygen quantum yields also increased from 0.37 for ClAlTSPc alone to 0.42 (for ClALTSPc with pristine GQDs), 0.52 (for ClAlTSPc with GQDs@GSH), and 0.54 (for ClAlTSPc with GQDs@GSH-FA). Thus, the present work may lead to a new generation of carbon-based nanomaterial photodynamic therapy agents with overall performance superior to conventional agents in terms of singlet oxygen generation, water dispersibility, and biocompatibility.
- Full Text:
- Date Issued: 2017
Improving the cold tolerance of false codling moth, thaumatotibia leucotreta, for better performance in a sterile insect release programme
- Authors: Daniel, Claire Ashleigh
- Date: 2017
- Subjects: Cryptophlebia leucotreta -- South Africa , Cryptophlebia leucotreta -- Reproduction -- Effect of temperature on , Cryptophlebia leucotreta -- Biological control -- South Africa , Citrus -- Diseases and pests -- Biological control -- South Africa , Insect pests -- Biological control -- South Africa , Insecticides , Citrus fruit industry -- South Africa
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/5271 , vital:20803
- Description: The false codling moth (FCM), Thaumatotibia leucotreta (Meyrick) (Lepidoptera: Tortricidae) is a major pest of citrus and other important crops in Sub-Saharan Africa. The introduction of a sterile insect technique (SIT) programme for FCM in South Africa has proven to be very effective in the control of FCM. The objective was to flood citrus orchards with large numbers of sterile males resulting in a ratio of at least 10 sterile to 1 wild moth, increasing the probability of a female moth mating with a sterile male. This target is often achieved and the programme is generally successful, however there are some challenges regarding this programme. The mass rearing environment, artificial diet, handling methods and irradiation have an impact on sterile insect quality as environmental differences between the rearing facility and field, influences the insect phenotype and competitiveness. This is evident as wild male moths can theoretically actively fly at a temperature of 12°C and laboratory-reared sterilized moths, due to the radiation treatment, appear unable to fly below 20°C. As a consequence, sterile males are out-competed by wild males during the cooler months of the year. This is detrimental to the SIT programme as FCM do not undergo diapause, meaning they are active during winter and will still reproduce. Therefore, to maximize the effect of the SIT programme, it is vital to increase the flight ability of mass reared sterile males at lower temperatures. Various studies have shown that by adding cryoprotectants to the basic laboratory diets increases the cold tolerance of certain insects and thus may allow them to be mobile at lower temperatures, however it imperative that any chemical used to augment the commercial diet of the insect has no negative effects on the insect physiology and development. To investigate this detail for FCM, five generations of FCM were reared on diets augmented with various known insect cryoprotectants. These augmented FCM were subsequently used in experiments designed to determine firstly, if the cryoprotectants had a positive result on the cold tolerance of the FCM, and secondly, if they had any adverse effects on other physiological aspects such as duration of development. Laboratory trials indicated that the flight ability of male FCM was improved when larvae were reared on diets augmented with trehalose and cholesterol (with an average of 40 % of cholesterol and trehalose augmented males that flew at 15 °C where 0 % of the control flew). Results obtained during the field trials support the laboratory results as there was a significant increase in the number of trehalose augmented moths caught in the field during March and July (winter). Results also showed potential for cholesterol to be used as an additive. Other important findings show that both cholesterol and trehalose have no negative impacts on developmental rate, pupal size, and egg production and viability. Trehalose was found to increase the pupal mass of male and female FCM, as well as the number of eggs laid per female. Cholesterol was found to increase developmental rate and the number of eggs laid. The main findings of this study were that diet additives could improve the massrearing of FCM for SIT and the competitiveness of the males, especially at lower temperatures. However, the additives were expensive and cost could well be a constraint to the wide scale implementation of the new technology.
- Full Text:
- Date Issued: 2017
- Authors: Daniel, Claire Ashleigh
- Date: 2017
- Subjects: Cryptophlebia leucotreta -- South Africa , Cryptophlebia leucotreta -- Reproduction -- Effect of temperature on , Cryptophlebia leucotreta -- Biological control -- South Africa , Citrus -- Diseases and pests -- Biological control -- South Africa , Insect pests -- Biological control -- South Africa , Insecticides , Citrus fruit industry -- South Africa
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/5271 , vital:20803
- Description: The false codling moth (FCM), Thaumatotibia leucotreta (Meyrick) (Lepidoptera: Tortricidae) is a major pest of citrus and other important crops in Sub-Saharan Africa. The introduction of a sterile insect technique (SIT) programme for FCM in South Africa has proven to be very effective in the control of FCM. The objective was to flood citrus orchards with large numbers of sterile males resulting in a ratio of at least 10 sterile to 1 wild moth, increasing the probability of a female moth mating with a sterile male. This target is often achieved and the programme is generally successful, however there are some challenges regarding this programme. The mass rearing environment, artificial diet, handling methods and irradiation have an impact on sterile insect quality as environmental differences between the rearing facility and field, influences the insect phenotype and competitiveness. This is evident as wild male moths can theoretically actively fly at a temperature of 12°C and laboratory-reared sterilized moths, due to the radiation treatment, appear unable to fly below 20°C. As a consequence, sterile males are out-competed by wild males during the cooler months of the year. This is detrimental to the SIT programme as FCM do not undergo diapause, meaning they are active during winter and will still reproduce. Therefore, to maximize the effect of the SIT programme, it is vital to increase the flight ability of mass reared sterile males at lower temperatures. Various studies have shown that by adding cryoprotectants to the basic laboratory diets increases the cold tolerance of certain insects and thus may allow them to be mobile at lower temperatures, however it imperative that any chemical used to augment the commercial diet of the insect has no negative effects on the insect physiology and development. To investigate this detail for FCM, five generations of FCM were reared on diets augmented with various known insect cryoprotectants. These augmented FCM were subsequently used in experiments designed to determine firstly, if the cryoprotectants had a positive result on the cold tolerance of the FCM, and secondly, if they had any adverse effects on other physiological aspects such as duration of development. Laboratory trials indicated that the flight ability of male FCM was improved when larvae were reared on diets augmented with trehalose and cholesterol (with an average of 40 % of cholesterol and trehalose augmented males that flew at 15 °C where 0 % of the control flew). Results obtained during the field trials support the laboratory results as there was a significant increase in the number of trehalose augmented moths caught in the field during March and July (winter). Results also showed potential for cholesterol to be used as an additive. Other important findings show that both cholesterol and trehalose have no negative impacts on developmental rate, pupal size, and egg production and viability. Trehalose was found to increase the pupal mass of male and female FCM, as well as the number of eggs laid per female. Cholesterol was found to increase developmental rate and the number of eggs laid. The main findings of this study were that diet additives could improve the massrearing of FCM for SIT and the competitiveness of the males, especially at lower temperatures. However, the additives were expensive and cost could well be a constraint to the wide scale implementation of the new technology.
- Full Text:
- Date Issued: 2017
Improving the effectiveness of training in Sanlam sky
- Authors: Gonya, Odwa Otto
- Date: 2017
- Subjects: Employees -- Training of -- Evaluation Occupational training
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: http://hdl.handle.net/10948/15116 , vital:28140
- Description: Sanlam Sky is a division of the Sanlam Group focusing on the developing markets. The division plays an important role in employing previously disadvantaged people with little or no prior training and experience. Training is the methodical development of Knowledge, Skills and Attitude that is required by the employee to perform a given task on the job satisfactorily. The training department therefore has a key responsibility of providing effective training to the newly appointed and existing employees and can be viewed as an essential vehicle for company success. The study identified that investment is allocated for the training and development of employees over the past years at Sanlam Sky and the organisation has not measured the effectiveness of training prior to this study. The main purpose of this study was to determine if the training initiatives at Sanlam Sky are effective or not and then identify factors to improve effectiveness of training at Sanlam Sky. The study also addresses the question of “what are the assessment methods for measuring T&D effectiveness that exist in the literature?” The empirical study included the distribution of a self-administered questionnaire amongst operations and distribution staff. Data was collected from multiple sources including 88 respondents and triangulated with unstructured interview data sourced from the learning managers; this data was used to assess the effectiveness of training and develop strategies for improvement. The findings indicate that the training provided at Sanlam Sky is effective, however there are no clear guidelines on identifying training needs in the organisation. The study identified that there is no evaluation framework that is used at Sanlam Sky. The trainees are not given an opportunity to choose how they want their training to be facilitated. Hypothesis of the study was tested and finally the study offers recommendations to be implemented in improving the effectiveness of training.
- Full Text:
- Date Issued: 2017
- Authors: Gonya, Odwa Otto
- Date: 2017
- Subjects: Employees -- Training of -- Evaluation Occupational training
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: http://hdl.handle.net/10948/15116 , vital:28140
- Description: Sanlam Sky is a division of the Sanlam Group focusing on the developing markets. The division plays an important role in employing previously disadvantaged people with little or no prior training and experience. Training is the methodical development of Knowledge, Skills and Attitude that is required by the employee to perform a given task on the job satisfactorily. The training department therefore has a key responsibility of providing effective training to the newly appointed and existing employees and can be viewed as an essential vehicle for company success. The study identified that investment is allocated for the training and development of employees over the past years at Sanlam Sky and the organisation has not measured the effectiveness of training prior to this study. The main purpose of this study was to determine if the training initiatives at Sanlam Sky are effective or not and then identify factors to improve effectiveness of training at Sanlam Sky. The study also addresses the question of “what are the assessment methods for measuring T&D effectiveness that exist in the literature?” The empirical study included the distribution of a self-administered questionnaire amongst operations and distribution staff. Data was collected from multiple sources including 88 respondents and triangulated with unstructured interview data sourced from the learning managers; this data was used to assess the effectiveness of training and develop strategies for improvement. The findings indicate that the training provided at Sanlam Sky is effective, however there are no clear guidelines on identifying training needs in the organisation. The study identified that there is no evaluation framework that is used at Sanlam Sky. The trainees are not given an opportunity to choose how they want their training to be facilitated. Hypothesis of the study was tested and finally the study offers recommendations to be implemented in improving the effectiveness of training.
- Full Text:
- Date Issued: 2017
Improving the supply of subsidised housing in South Africa
- Authors: Bekker, Jakobus Petrus
- Date: 2017
- Subjects: Housing -- South Africa Housing subsidies -- South Africa , Low-income housing -- South Africa Public housing -- South Africa Housing development -- South Africa
- Language: English
- Type: Thesis , Doctoral , DPhil
- Identifier: http://hdl.handle.net/10948/19553 , vital:28893
- Description: Despite South African citizen’s constitutional right to adequate housing, Government’s housing delivery has been described as a complex, multi-stakeholder, multi-phase problem, exacerbated by political interference and corruption. Housing delivery in South Africa is ideologically and politically designed and executed. However, the government subsidised housing sector remains plagued by: huge and increasing backlogs; corruption; quality concerns, and recipient and stakeholder dissatisfaction. This includes the government subsidised housing construction sector, which faces issues such as: established contractors leaving the sector; late and failed completion; substandard quality; rework; cost overruns; late progress payments; and insolvencies. Moreover, government subsidised housing officials, which forms part of this sector, must contend with abandoned projects and appointing new contractors; shoddy workmanship from sub-standard contractors; remedial work, including demolition and rebuilding; and systemic problems such as staff shortages and under qualified staff. The process of Government’s ideological and political designed and execution may therefore not have considered certain practicalities relative to construction principles and practice. It therefore appears that there may be some relationship between the compatibility of Government’s housing ideological and political designed (policy) and execution and general construction principles and practice. It is clear from the related literature that government subsidised housing construction has mostly been investigated as an exercise observing from the outside in, and not from a construction sector perspective. The main purpose of this study is thus to explore housing policy and practice compatibility as a major obstacle to housing delivery in general and assess whether the current housing policy is sufficiently responsive to the requirements of the government subsidised housing sector by specifically describing and exploring the effects of Government’s housing procurement policies relative to the ability of the construction sector to supply government subsidised housing. More specifically, the study describes and explores corruption, quality; contractors and worker competency, and government capacity as specific consequences of housing policy and practice incompatibility, as well as factors contributing to recipient dissatisfaction and the housing backlog. Finally, based on the finding, a proposed framework for improving the supply of subsidised housing in South Africa has been developed. The methodology for this study adopted a post-positivist philosophy, embracing a quantitative approach using questionnaires, which incorporated mainly five-point Likert type scale, but also multiple-choice questions, as instruments for data collection. Three surveys were conducted, starting with a pilot study and followed by a primary study, during which a total of 2 884 potential participants within the construction sector across South Africa were randomly sampled and solicited to participate, of which 284 responded. The respondents consisted of four groups: general contractors (76); government housing officials (34); built environment professionals (137), and built environment suppliers (37). An electronic questionnaire was sent by email to all potential participants and allowed four weeks to complete the survey. Furthermore, a housing recipient survey was conducted among 100 randomly selected recipients of government subsidised housing in the Nelson Mandela Metropolitan area, by means of a structured interview using a paper based questionnaire, over a period of two weeks. The primary outcome measures used for this study were the ranked mean scores for mainly descriptive analysis and the Chi-square test, the 𝑡-test, Cohan’s d test, ANOVA and Scheffé test, using Cronbach's alpha as a measure of internal consistency of scale and validity, for inferential analyses and hypotheses testing. Hypothesis testing was founded upon Government’s worldview that its policies will not influence the operations of the construction sector relative to housing construction, and therefore tested respondents’ perspectives with respect to the impact that government policies have in terms of contractor operations and contractor success, as well as its contribution towards the housing backlog, substandard housing, recipient dissatisfaction and corruption. The following results were obtained by means of the hypothesis testing:Government housing procurement policies are inappropriate for application in the government subsidised housing sector. Respondents therefore disagree with the notion that government policy and practices do not impact contractor operations and contractor success, and thus the supply of houses; The application of government housing procurement policies leads to inadequate quality. Respondents therefore disagree with the notion that government preferential procurement policies do not impact quality; Government’s housing procurement policies inappropriately target emerging contractors. Respondents therefore disagree with the notion that Government’s targeting of emerging contractors does not impact housing supply; Government has inadequate capacity to address subsidised housing construction sector requirements in terms of housing projects. Respondents therefore disagree with the notion that Government has the capacity to address subsidised housing construction sector requirements in the supply of housing, and Government subsidised houses do not meet recipients’ expectations. Respondents therefore disagree with the notion that government subsidised houses do meet recipients’ expectations. It thus became apparent that housing supply is mostly inhibited by Government’s housing procurement policy, contributing to various factors, such as quality capability, contractor capability, systemic and administrative capacity, and resulting in recipient dissatisfaction. Using Pearson’s product moment correlation, a framework model was developed to illustrate the process flow, which revealed definitive statistical and practical relationships between these factors, and indeed reflects complex relationships between factors inhibiting supply and resulting in recipient dissatisfaction. To find an appropriate framework model for the purpose of improving housing supply, various sources were consulted. Based on the research question, together with the aims and objectives for this study, as well as the realisation that the problems associated with housing supply relate to the project management of the construction phase, which requires interventions for improving supply, it was decided that a results framework would be the most appropriate for this purpose. The proposed framework is therefore a graphical depiction of how the research process may be used to identify problems in the government subsidised housing sector, questioning how these may be resolved, setting strategies to improve the situation, evolving hypotheses and testing these hypotheses to establish the critical factors to be considered in the process of resolving the problem in the housing sector, by means of implementation and feedback.
- Full Text:
- Date Issued: 2017
- Authors: Bekker, Jakobus Petrus
- Date: 2017
- Subjects: Housing -- South Africa Housing subsidies -- South Africa , Low-income housing -- South Africa Public housing -- South Africa Housing development -- South Africa
- Language: English
- Type: Thesis , Doctoral , DPhil
- Identifier: http://hdl.handle.net/10948/19553 , vital:28893
- Description: Despite South African citizen’s constitutional right to adequate housing, Government’s housing delivery has been described as a complex, multi-stakeholder, multi-phase problem, exacerbated by political interference and corruption. Housing delivery in South Africa is ideologically and politically designed and executed. However, the government subsidised housing sector remains plagued by: huge and increasing backlogs; corruption; quality concerns, and recipient and stakeholder dissatisfaction. This includes the government subsidised housing construction sector, which faces issues such as: established contractors leaving the sector; late and failed completion; substandard quality; rework; cost overruns; late progress payments; and insolvencies. Moreover, government subsidised housing officials, which forms part of this sector, must contend with abandoned projects and appointing new contractors; shoddy workmanship from sub-standard contractors; remedial work, including demolition and rebuilding; and systemic problems such as staff shortages and under qualified staff. The process of Government’s ideological and political designed and execution may therefore not have considered certain practicalities relative to construction principles and practice. It therefore appears that there may be some relationship between the compatibility of Government’s housing ideological and political designed (policy) and execution and general construction principles and practice. It is clear from the related literature that government subsidised housing construction has mostly been investigated as an exercise observing from the outside in, and not from a construction sector perspective. The main purpose of this study is thus to explore housing policy and practice compatibility as a major obstacle to housing delivery in general and assess whether the current housing policy is sufficiently responsive to the requirements of the government subsidised housing sector by specifically describing and exploring the effects of Government’s housing procurement policies relative to the ability of the construction sector to supply government subsidised housing. More specifically, the study describes and explores corruption, quality; contractors and worker competency, and government capacity as specific consequences of housing policy and practice incompatibility, as well as factors contributing to recipient dissatisfaction and the housing backlog. Finally, based on the finding, a proposed framework for improving the supply of subsidised housing in South Africa has been developed. The methodology for this study adopted a post-positivist philosophy, embracing a quantitative approach using questionnaires, which incorporated mainly five-point Likert type scale, but also multiple-choice questions, as instruments for data collection. Three surveys were conducted, starting with a pilot study and followed by a primary study, during which a total of 2 884 potential participants within the construction sector across South Africa were randomly sampled and solicited to participate, of which 284 responded. The respondents consisted of four groups: general contractors (76); government housing officials (34); built environment professionals (137), and built environment suppliers (37). An electronic questionnaire was sent by email to all potential participants and allowed four weeks to complete the survey. Furthermore, a housing recipient survey was conducted among 100 randomly selected recipients of government subsidised housing in the Nelson Mandela Metropolitan area, by means of a structured interview using a paper based questionnaire, over a period of two weeks. The primary outcome measures used for this study were the ranked mean scores for mainly descriptive analysis and the Chi-square test, the 𝑡-test, Cohan’s d test, ANOVA and Scheffé test, using Cronbach's alpha as a measure of internal consistency of scale and validity, for inferential analyses and hypotheses testing. Hypothesis testing was founded upon Government’s worldview that its policies will not influence the operations of the construction sector relative to housing construction, and therefore tested respondents’ perspectives with respect to the impact that government policies have in terms of contractor operations and contractor success, as well as its contribution towards the housing backlog, substandard housing, recipient dissatisfaction and corruption. The following results were obtained by means of the hypothesis testing:Government housing procurement policies are inappropriate for application in the government subsidised housing sector. Respondents therefore disagree with the notion that government policy and practices do not impact contractor operations and contractor success, and thus the supply of houses; The application of government housing procurement policies leads to inadequate quality. Respondents therefore disagree with the notion that government preferential procurement policies do not impact quality; Government’s housing procurement policies inappropriately target emerging contractors. Respondents therefore disagree with the notion that Government’s targeting of emerging contractors does not impact housing supply; Government has inadequate capacity to address subsidised housing construction sector requirements in terms of housing projects. Respondents therefore disagree with the notion that Government has the capacity to address subsidised housing construction sector requirements in the supply of housing, and Government subsidised houses do not meet recipients’ expectations. Respondents therefore disagree with the notion that government subsidised houses do meet recipients’ expectations. It thus became apparent that housing supply is mostly inhibited by Government’s housing procurement policy, contributing to various factors, such as quality capability, contractor capability, systemic and administrative capacity, and resulting in recipient dissatisfaction. Using Pearson’s product moment correlation, a framework model was developed to illustrate the process flow, which revealed definitive statistical and practical relationships between these factors, and indeed reflects complex relationships between factors inhibiting supply and resulting in recipient dissatisfaction. To find an appropriate framework model for the purpose of improving housing supply, various sources were consulted. Based on the research question, together with the aims and objectives for this study, as well as the realisation that the problems associated with housing supply relate to the project management of the construction phase, which requires interventions for improving supply, it was decided that a results framework would be the most appropriate for this purpose. The proposed framework is therefore a graphical depiction of how the research process may be used to identify problems in the government subsidised housing sector, questioning how these may be resolved, setting strategies to improve the situation, evolving hypotheses and testing these hypotheses to establish the critical factors to be considered in the process of resolving the problem in the housing sector, by means of implementation and feedback.
- Full Text:
- Date Issued: 2017
In conversation with Andrew Tshabangu and Thembinkosi Goniwe "Footprints" exhibition:
- Authors: Lila, Philiswa
- Date: 2017
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/146489 , vital:38530 , https://www.ru.ac.za/artsofafrica/exhibitionsperformances/inzwi/
- Description: Inzwi! was an art event during the 2017 National Arts Festival in Grahamstown that celebrated the 5th anniversary of the Lucid Lunchbox, a student-led series of talks linked to the Arts of Africa and Global Souths research programme at Rhodes University. During the festival, five sets composed of three videos interjected the talks presented by Dineo Seshee Bopape and Beth Diane Armstrong, as well as a conversation between Andrew Tshabangu, Thembinkosi Goniwe and Philiswa Lila. The event intended to trigger reflection and dialogue, through a ‘wake-up call’ to grapple with our collective heritage and struggles, our fears and points of departure in order to envision futures. The selection of videos drew from the work of Rhodes Fine Art students, Alumni and Artists in Residence. Works on display addressed matters of identity (social, political and/or fictional); social engagement and activism; religious and spiritual practices in African contexts; race and white supremacy; and, finally, patronising relations in the art world. Borrowing from the words of Weléla Mar Kindred, the choreography of this event, like others that have been propelling black body politics in recent movements, is one of "communal healing, strength and solidarity".
- Full Text:
- Date Issued: 2017
- Authors: Lila, Philiswa
- Date: 2017
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/146489 , vital:38530 , https://www.ru.ac.za/artsofafrica/exhibitionsperformances/inzwi/
- Description: Inzwi! was an art event during the 2017 National Arts Festival in Grahamstown that celebrated the 5th anniversary of the Lucid Lunchbox, a student-led series of talks linked to the Arts of Africa and Global Souths research programme at Rhodes University. During the festival, five sets composed of three videos interjected the talks presented by Dineo Seshee Bopape and Beth Diane Armstrong, as well as a conversation between Andrew Tshabangu, Thembinkosi Goniwe and Philiswa Lila. The event intended to trigger reflection and dialogue, through a ‘wake-up call’ to grapple with our collective heritage and struggles, our fears and points of departure in order to envision futures. The selection of videos drew from the work of Rhodes Fine Art students, Alumni and Artists in Residence. Works on display addressed matters of identity (social, political and/or fictional); social engagement and activism; religious and spiritual practices in African contexts; race and white supremacy; and, finally, patronising relations in the art world. Borrowing from the words of Weléla Mar Kindred, the choreography of this event, like others that have been propelling black body politics in recent movements, is one of "communal healing, strength and solidarity".
- Full Text:
- Date Issued: 2017
In silico analysis of plasmodium falciparum Hsp70-x for potential binding sites and hits
- Authors: Amusengeri, Arnold
- Date: 2017
- Subjects: Uncatalogued
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/59136 , vital:27435
- Description: Restricted access-thesis embargoed for 1 year - release date April 2019
- Full Text:
- Date Issued: 2017
- Authors: Amusengeri, Arnold
- Date: 2017
- Subjects: Uncatalogued
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/59136 , vital:27435
- Description: Restricted access-thesis embargoed for 1 year - release date April 2019
- Full Text:
- Date Issued: 2017
In vitro antimicrobial activity of the methanol extract and compounds from the wood of Ficus elastica Roxb. ex Hornem. aerial roots
- Meyer, Franck, Fannang, Simone Véronique, Noundou, Xavier Siwe, Krause, Rui W M, Teinkela, Jean Emmanuel Mbosso, Vardamides, Juliette Cathérine, Mpondo, Albert Emmanuel Mpondo, Azebaze, Anatole Guy Blaise, Nguedia, Jules Clément Assob
- Authors: Meyer, Franck , Fannang, Simone Véronique , Noundou, Xavier Siwe , Krause, Rui W M , Teinkela, Jean Emmanuel Mbosso , Vardamides, Juliette Cathérine , Mpondo, Albert Emmanuel Mpondo , Azebaze, Anatole Guy Blaise , Nguedia, Jules Clément Assob
- Date: 2017
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/126154 , vital:35854 , https://doi.org/10.1016/j.sajb.2017.03.026
- Description: Ficus elastica Roxb. ex Hornem., an edible plant belonging to the family of Moraceae, is traditionally used against skin infections and allergies besides having diuretic properties. This study aimed at investigating the antimicrobial activity of the wood of F. elastica aerial roots against a set of bacteria (Staphylococcus aureus; Escherichia coli, Proteus vulgaris, Providencia stuartii and Pseudomonas aeruginosa) and a yeast (Candida albicans). A mixture of linear aliphatic alkanes with n-hexacosane as major compound, β-sitosterol, biochanin A, sitosteryl 3-O-β-D-glucopyranoside (1), elasticamide (2), elastiquinone (3) and ficusoside B (4) were purified and characterized. Antimicrobial activities, expressed as minimum inhibitory concentration (MIC), indicated that the methanol extract showed MIC of 39.1 μg/mL; the lowest values were obtained for 3 and 4, with MIC as low as 4.9 μg/mL, smaller than the values of reference antibiotics (25 μg/mL). Furthermore, as most of the studied samples exhibited Minimum Microbicidal Concentration/Minimum Inhibitory Concentration (MMC/MIC) ratios lower than 4, a microbicidal effect was clearly exhibited. The overall results provided evidence that the wood of F. elastica aerial roots, as well as some of its isolated components might be potential sources of new antimicrobial drugs.
- Full Text:
- Date Issued: 2017
- Authors: Meyer, Franck , Fannang, Simone Véronique , Noundou, Xavier Siwe , Krause, Rui W M , Teinkela, Jean Emmanuel Mbosso , Vardamides, Juliette Cathérine , Mpondo, Albert Emmanuel Mpondo , Azebaze, Anatole Guy Blaise , Nguedia, Jules Clément Assob
- Date: 2017
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/126154 , vital:35854 , https://doi.org/10.1016/j.sajb.2017.03.026
- Description: Ficus elastica Roxb. ex Hornem., an edible plant belonging to the family of Moraceae, is traditionally used against skin infections and allergies besides having diuretic properties. This study aimed at investigating the antimicrobial activity of the wood of F. elastica aerial roots against a set of bacteria (Staphylococcus aureus; Escherichia coli, Proteus vulgaris, Providencia stuartii and Pseudomonas aeruginosa) and a yeast (Candida albicans). A mixture of linear aliphatic alkanes with n-hexacosane as major compound, β-sitosterol, biochanin A, sitosteryl 3-O-β-D-glucopyranoside (1), elasticamide (2), elastiquinone (3) and ficusoside B (4) were purified and characterized. Antimicrobial activities, expressed as minimum inhibitory concentration (MIC), indicated that the methanol extract showed MIC of 39.1 μg/mL; the lowest values were obtained for 3 and 4, with MIC as low as 4.9 μg/mL, smaller than the values of reference antibiotics (25 μg/mL). Furthermore, as most of the studied samples exhibited Minimum Microbicidal Concentration/Minimum Inhibitory Concentration (MMC/MIC) ratios lower than 4, a microbicidal effect was clearly exhibited. The overall results provided evidence that the wood of F. elastica aerial roots, as well as some of its isolated components might be potential sources of new antimicrobial drugs.
- Full Text:
- Date Issued: 2017
Incidence of norovirus from pig faecal samples in the Eastern Cape South Africa
- Authors: Taku, Ongeziwe
- Date: 2017
- Subjects: Viral gastroenteritis Virus diseases Swine -- Diseases
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10353/12374 , vital:39257
- Description: Norovirus is one of the causative agents of gastroenteritis in humans and belongs to the Caliciviridae family. Gastroenteritis is a common disease which has emerged as a worldwide health problem and it induces high number of diarrheal episodes in children and adults. Communal location such as schools, homes, day-care, cruise ships and hospitals have high risk of Norovirus infection. Besides humans, Norovirus have been found in farm animals including pigs; porcine Norovirus has been reported to be genetically related to human Norovirus which raise concerns about potential zoonotic spread and pigs may serve as reservoirs of human Norovirus strains. This current study assessed the occurrence of Norovirus infection amongst pigs in selected commercial pig farms in the Eastern Cape, South Africa. One hundred and twenty (120) RNA samples isolated from faecal samples of pigs were amplified using the RT-PCR and Nested PCR assay targeting the RdRp gene. Out of the one hundred and twenty RNA samples analysed, only five (4.2 percent) were positive for Norovirus. All positive isolates were sequenced (ABI 310 prism sequencer), edited and analysed phylogenetically using the Geneious version 9.1.5 software. Phylogenetic analysis of the generated sequences from the positive samples was performed with reference sequences obtained from the GenBank. Out of the five positive isolates analysed, four nucleotide sequences (FH14, FH20, FH13 and TS05) showed high similarity with Caliciviruses (non-human) and FHO5 showed high similarity to human Norovirus and clustered with human Norovirus GII. These findings revealed low prevalence of Norovirus in the Eastern Cape Province. Notwithstanding the low prevalence of Norovirus in the study communities, it is still of serious health concern.
- Full Text:
- Date Issued: 2017
- Authors: Taku, Ongeziwe
- Date: 2017
- Subjects: Viral gastroenteritis Virus diseases Swine -- Diseases
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10353/12374 , vital:39257
- Description: Norovirus is one of the causative agents of gastroenteritis in humans and belongs to the Caliciviridae family. Gastroenteritis is a common disease which has emerged as a worldwide health problem and it induces high number of diarrheal episodes in children and adults. Communal location such as schools, homes, day-care, cruise ships and hospitals have high risk of Norovirus infection. Besides humans, Norovirus have been found in farm animals including pigs; porcine Norovirus has been reported to be genetically related to human Norovirus which raise concerns about potential zoonotic spread and pigs may serve as reservoirs of human Norovirus strains. This current study assessed the occurrence of Norovirus infection amongst pigs in selected commercial pig farms in the Eastern Cape, South Africa. One hundred and twenty (120) RNA samples isolated from faecal samples of pigs were amplified using the RT-PCR and Nested PCR assay targeting the RdRp gene. Out of the one hundred and twenty RNA samples analysed, only five (4.2 percent) were positive for Norovirus. All positive isolates were sequenced (ABI 310 prism sequencer), edited and analysed phylogenetically using the Geneious version 9.1.5 software. Phylogenetic analysis of the generated sequences from the positive samples was performed with reference sequences obtained from the GenBank. Out of the five positive isolates analysed, four nucleotide sequences (FH14, FH20, FH13 and TS05) showed high similarity with Caliciviruses (non-human) and FHO5 showed high similarity to human Norovirus and clustered with human Norovirus GII. These findings revealed low prevalence of Norovirus in the Eastern Cape Province. Notwithstanding the low prevalence of Norovirus in the study communities, it is still of serious health concern.
- Full Text:
- Date Issued: 2017
Incidence of unnatural deaths in Transkei subregion of South Africa (1996 –2015)
- Date: 2017
- Subjects: South Africa Death 2078-6204 Journal article
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/11260/6172 , vital:45258 , xlink:href=": https://doi.org/10.1080/20786190.2017.1292697"
- Description: Background: Unnatural deaths are a serious and preventable public health problem in South Africa. Such an event is more than the death of an individual who has died in an unnatural way. It has a negative and long-lasting impact on family members as well as on society as a whole. Objective: To study the pattern of unnatural deaths in the Transkei sub-region of South Africa. Method: A record review was undertaken from 1996 to 2015 of 24 693 medico-legal autopsies performed at Mthatha Forensic Pathology Laboratory. Results: At the Mthatha Forensic Pathology Laboratory, 24 693 autopsies were performed between 1996 and 2015 on people who had died unnatural deaths. The average rate of unnatural death is 205 per 100 000 per year in this region. The figure is 160 per 100 000 among males and 44 per 100 000 among females. The rate of unnatural death has increased from 153 per 100 000 in 1996 to 260 per 100 000 in 2015. In two-thirds (69%) of cases, the cause of death is related to trauma. Slightly less than half (45%) of the victims in this study were murdered. Conclusion: There is an increasing trend of unnatural deaths in the Mthatha region of South Africa. The male-to-female ratio is 3.8:1, and about half (48%) of the victims were between 11 and 30 years old. This situation needs the urgent attention of the law enforcement agencies. Keywords: unnatural deaths, traumatic deaths, violent death
- Full Text:
- Date Issued: 2017
- Date: 2017
- Subjects: South Africa Death 2078-6204 Journal article
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/11260/6172 , vital:45258 , xlink:href=": https://doi.org/10.1080/20786190.2017.1292697"
- Description: Background: Unnatural deaths are a serious and preventable public health problem in South Africa. Such an event is more than the death of an individual who has died in an unnatural way. It has a negative and long-lasting impact on family members as well as on society as a whole. Objective: To study the pattern of unnatural deaths in the Transkei sub-region of South Africa. Method: A record review was undertaken from 1996 to 2015 of 24 693 medico-legal autopsies performed at Mthatha Forensic Pathology Laboratory. Results: At the Mthatha Forensic Pathology Laboratory, 24 693 autopsies were performed between 1996 and 2015 on people who had died unnatural deaths. The average rate of unnatural death is 205 per 100 000 per year in this region. The figure is 160 per 100 000 among males and 44 per 100 000 among females. The rate of unnatural death has increased from 153 per 100 000 in 1996 to 260 per 100 000 in 2015. In two-thirds (69%) of cases, the cause of death is related to trauma. Slightly less than half (45%) of the victims in this study were murdered. Conclusion: There is an increasing trend of unnatural deaths in the Mthatha region of South Africa. The male-to-female ratio is 3.8:1, and about half (48%) of the victims were between 11 and 30 years old. This situation needs the urgent attention of the law enforcement agencies. Keywords: unnatural deaths, traumatic deaths, violent death
- Full Text:
- Date Issued: 2017
Indigenous and traditional musics in the school classroom : a re-evaluation of the South African Indigenous African Music (IAM) curriculum
- Authors: McConnachie, Boudina
- Date: 2017
- Subjects: Ethnomusicology , Indigenous people -- Music , Music -- Instruction and study -- Africa , Music -- Instruction and study -- Curricula -- Africa
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:21182 , http://hdl.handle.net/10962/6806
- Description: Musical ideals set by European standards and values, entrenched through colonial oppression and promoted by the continued veneration of Western culture need to be re-evaluated. Despite the intention of the ANC government, through the Department of Basic Education's Curriculum and Assessment Policy Statement music curricula, to integrate Indigenous Knowledge and musics into the South African classroom, evidence shows that opportunities to do so are not seized. With reference to the proclaimed values of an African sensibility in the model of the South African music education curriculum, the history of its development and the current pedagogical movement towards transformation in the production of knowledge and the inclusion of Indigenous Knowledge (IK), this thesis questions why teachers in government schools in South Africa are not executing the Indigenous African Music (IAM) syllabus in the CAPS FET music curriculum. Taking the history of music education and the development of curriculum models and frameworks into account, it interrogates what strategies could improve the application of the current music curriculum in government schools in South Africa. These questions are addressed in the thesis by way of a discussion of the music curriculum and what its praxis in the classroom reveals about its efficacy, through observations and personal experiences, the observations of teachers and student teachers, a comparison with the experience in Zimbabwe, and an analysis of the music curriculum as it is currently devised and implemented. Straddling three methodological approaches, namely the ethnographic, the autoethnographic and the action research approach this study finds that the CAPS FET music curriculum does provide realistic opportunities to engage with African Indigenous and traditional music. This, however, is dependent upon the training of the teacher, facilities available in the classroom and the prior knowledge of the learner. A fundamental flaw of this curriculum is the approach to practical assessment of Indigenous and traditional African musics and the lack of assessment criteria and practical guidelines. In addition, the findings suggest that the fault regarding implementation of the curriculum lies in the training of students (who become teachers) at tertiary level, where an integrated approach to skills development regarding Indigenous African music is suggested.
- Full Text:
- Date Issued: 2017
- Authors: McConnachie, Boudina
- Date: 2017
- Subjects: Ethnomusicology , Indigenous people -- Music , Music -- Instruction and study -- Africa , Music -- Instruction and study -- Curricula -- Africa
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:21182 , http://hdl.handle.net/10962/6806
- Description: Musical ideals set by European standards and values, entrenched through colonial oppression and promoted by the continued veneration of Western culture need to be re-evaluated. Despite the intention of the ANC government, through the Department of Basic Education's Curriculum and Assessment Policy Statement music curricula, to integrate Indigenous Knowledge and musics into the South African classroom, evidence shows that opportunities to do so are not seized. With reference to the proclaimed values of an African sensibility in the model of the South African music education curriculum, the history of its development and the current pedagogical movement towards transformation in the production of knowledge and the inclusion of Indigenous Knowledge (IK), this thesis questions why teachers in government schools in South Africa are not executing the Indigenous African Music (IAM) syllabus in the CAPS FET music curriculum. Taking the history of music education and the development of curriculum models and frameworks into account, it interrogates what strategies could improve the application of the current music curriculum in government schools in South Africa. These questions are addressed in the thesis by way of a discussion of the music curriculum and what its praxis in the classroom reveals about its efficacy, through observations and personal experiences, the observations of teachers and student teachers, a comparison with the experience in Zimbabwe, and an analysis of the music curriculum as it is currently devised and implemented. Straddling three methodological approaches, namely the ethnographic, the autoethnographic and the action research approach this study finds that the CAPS FET music curriculum does provide realistic opportunities to engage with African Indigenous and traditional music. This, however, is dependent upon the training of the teacher, facilities available in the classroom and the prior knowledge of the learner. A fundamental flaw of this curriculum is the approach to practical assessment of Indigenous and traditional African musics and the lack of assessment criteria and practical guidelines. In addition, the findings suggest that the fault regarding implementation of the curriculum lies in the training of students (who become teachers) at tertiary level, where an integrated approach to skills development regarding Indigenous African music is suggested.
- Full Text:
- Date Issued: 2017
Indigenous knowledge in the school curriculum: teacher educator perceptions of place and position
- Ronoh, Janet Chepchirchir, Siebenhuner, Bernd
- Authors: Ronoh, Janet Chepchirchir , Siebenhuner, Bernd
- Date: 2017
- Subjects: Education -- Curricula -- Africa , Curriculum planning -- Africa Curriculum change -- Africa Ethnoscience -- Africa
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: http://hdl.handle.net/10948/19971 , vital:29015
- Description: Post-colonial school curricula in Africa, which are mostly dominated by western values, knowledge and pedagogies at the expense of indigenous knowledge (IK) and epistemologies, remain a major area of concern in education. After decades of debate on the relevance of IK and its suitability for integration in school curricula, there appears to be a shift in paradigm towards recognising indigenous ways of knowing and transforming curricula towards using inclusive, contextual and practical content and pedagogies that reflect the changing needs of African society. Despite specific provisions in the South African and Kenyan constitutions and education policy documents, the development and implementation of IK integrated curricula remains a major concern. Teacher educators are important stakeholders in terms of the integration of IK and, as such, this qualitative study, which is framed within an interpretivist philosophical view and draws on a case study methodology, explores teacher educators‘ perceptions of value, place and position of IK in the school curriculum. The samples, which were drawn from two African universities, one in South Africa and one in Kenya, comprised ten purposively selected teacher educators from local indigenous communities in each university. Data were generated via a semi-structured questionnaire, a modified focus group discussion (Imbizo/Baraza) process, and individual semi-structured interviews. The data generated were analysed thematically and revealed that the participating teacher educators have shared conceptual understandings of indigenous knowledge and advocate for more inclusive appropriation and integration of indigenous languages, agriculture, herbal medicine, technological and scientific indigenous knowledge items that they feel are still marginalised in the school curriculum of their respective countries. An inclusive education approach was proposed in which both modern knowledge and IK are intertwined in the curriculum in order to serve the current needs of indigenous cultures and society in general.
- Full Text:
- Date Issued: 2017
- Authors: Ronoh, Janet Chepchirchir , Siebenhuner, Bernd
- Date: 2017
- Subjects: Education -- Curricula -- Africa , Curriculum planning -- Africa Curriculum change -- Africa Ethnoscience -- Africa
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: http://hdl.handle.net/10948/19971 , vital:29015
- Description: Post-colonial school curricula in Africa, which are mostly dominated by western values, knowledge and pedagogies at the expense of indigenous knowledge (IK) and epistemologies, remain a major area of concern in education. After decades of debate on the relevance of IK and its suitability for integration in school curricula, there appears to be a shift in paradigm towards recognising indigenous ways of knowing and transforming curricula towards using inclusive, contextual and practical content and pedagogies that reflect the changing needs of African society. Despite specific provisions in the South African and Kenyan constitutions and education policy documents, the development and implementation of IK integrated curricula remains a major concern. Teacher educators are important stakeholders in terms of the integration of IK and, as such, this qualitative study, which is framed within an interpretivist philosophical view and draws on a case study methodology, explores teacher educators‘ perceptions of value, place and position of IK in the school curriculum. The samples, which were drawn from two African universities, one in South Africa and one in Kenya, comprised ten purposively selected teacher educators from local indigenous communities in each university. Data were generated via a semi-structured questionnaire, a modified focus group discussion (Imbizo/Baraza) process, and individual semi-structured interviews. The data generated were analysed thematically and revealed that the participating teacher educators have shared conceptual understandings of indigenous knowledge and advocate for more inclusive appropriation and integration of indigenous languages, agriculture, herbal medicine, technological and scientific indigenous knowledge items that they feel are still marginalised in the school curriculum of their respective countries. An inclusive education approach was proposed in which both modern knowledge and IK are intertwined in the curriculum in order to serve the current needs of indigenous cultures and society in general.
- Full Text:
- Date Issued: 2017
Individual-related factors influencing knowledge-sharing intention in knowledge-intensive businesses
- Authors: Van Greunen, Conrad
- Date: 2017
- Subjects: Knowledge management Intellectual capital -- Management , Management -- Information services Organizational learning
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10948/21274 , vital:29469
- Description: It has become generally accepted to refer to today‟s global economy as a knowledge-based economy, since knowledge has increasingly become the resource, instead of a resource for wealth creation. The ability of businesses to harness the potential of intangible assets such as knowledge has become far more decisive than their ability to manage physical assets. In the implementation of knowledge management activities, knowledge sharing is recognised as an integral task and key enabler of knowledge management. Although knowledge sharing is regarded as one of the most crucial factors in the effective management of knowledge, in knowledge-intensive businesses in particular, it has also been established that most employees are reluctant to share knowledge. Research further confirms that the factors that promote or discourage knowledge-sharing behaviour in businesses are poorly understood and that knowledge management systems fail as a result of the misunderstanding of individual characteristics that could influence knowledge sharing. Moreover, the focus of knowledge-sharing literature, in terms of the unit of analysis, is rarely at an individual/micro level, although the role of individuals in the knowledge-sharing process is critical as tacit knowledge resides within the individual and knowledge sharing starts with individuals. Given the importance of understanding knowledge sharing of individuals in knowledge-intensive businesses – but noting the lack of existing systematic, integrated research that focuses on individual-related factors influencing knowledge sharing – the purpose of this study was to fill the gap in the current literature. As such, the primary objective of this research was to identify and empirically investigate the individual-related factors influencing the Knowledge-sharing intention of individual employees in knowledge-intensive businesses. The literature review revealed twelve constructs, namely Individuals’ awareness, Intrinsic motivation, Extrinsic motivation, Transactional psychological contract breach, Relational psychological contract breach, Relationship conflict, Task conflict, Extraversion, Neuroticism, Openness to experience, Agreeableness and Conscientiousness that could influence the dependent variable Knowledge-sharing intention in knowledge-intensive businesses. Various moderating relationships between the dependent and independent variables were also proposed, while seven demographic variables (Age, Gender, Language, Highest qualification, Ethnic background, Organisational tenure and Job tenure of the respondent) were identified as potential control variables. Each construct in the hypothesised model of individual-related factors influencing Knowledge-sharing intention was defined and operationalised using items sourced from validated measuring instruments in previous studies. Several self-generated items based on secondary sources were also formulated. A structured questionnaire was made available to respondents identified by means of the convenience sampling technique, and the data collected from 597 usable questionnaires was subjected to various statistical analyses. An exploratory factor analysis (EFA) was conducted which confirmed the unique factors present in the data, and Cronbach-alpha coefficients were calculated to confirm the reliability of the measuring instrument. Structural equation modelling (SEM) was the main statistical procedure used to test the significance of the relationships hypothesised between the various independent and dependent variables. A subset of SEM, namely general linear modelling (GLM) was used to determine the influence of selected demographic variables on Knowledge-sharing intention and to assess various moderating relationships as proposed in the hypothesised model. The main findings of this study were that personality traits are strong predictors of individual employees‟ willingness to share knowledge, and that the maturity of individuals, in terms of realising the significance and value of sharing their knowledge with others, and in recognising the intrinsic benefits of sharing, influence Knowledge-sharing intention. The main limitations of the study were the use of a convenience sampling technique to collect the data, as well as the dependence of self-report by respondents, which could lead to response bias. This study has added to the body of knowledge management research, in particular knowledge-sharing research, by investigating selected individual-related factors influencing the Knowledge-sharing intention of individuals in a particular subset of businesses, namely knowledge-intensive businesses, and focusing on a particular type of knowledge, namely tacit knowledge. From a business‟s perspective, this study offers recommendations and suggestions for managing these individual-related factors in such a way as to increase knowledge sharing among employees, and as a result, the effectiveness and competitive advantage of knowledge-intensive businesses.
- Full Text:
- Date Issued: 2017
Individual-related factors influencing knowledge-sharing intention in knowledge-intensive businesses
- Authors: Van Greunen, Conrad
- Date: 2017
- Subjects: Knowledge management Intellectual capital -- Management , Management -- Information services Organizational learning
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10948/21274 , vital:29469
- Description: It has become generally accepted to refer to today‟s global economy as a knowledge-based economy, since knowledge has increasingly become the resource, instead of a resource for wealth creation. The ability of businesses to harness the potential of intangible assets such as knowledge has become far more decisive than their ability to manage physical assets. In the implementation of knowledge management activities, knowledge sharing is recognised as an integral task and key enabler of knowledge management. Although knowledge sharing is regarded as one of the most crucial factors in the effective management of knowledge, in knowledge-intensive businesses in particular, it has also been established that most employees are reluctant to share knowledge. Research further confirms that the factors that promote or discourage knowledge-sharing behaviour in businesses are poorly understood and that knowledge management systems fail as a result of the misunderstanding of individual characteristics that could influence knowledge sharing. Moreover, the focus of knowledge-sharing literature, in terms of the unit of analysis, is rarely at an individual/micro level, although the role of individuals in the knowledge-sharing process is critical as tacit knowledge resides within the individual and knowledge sharing starts with individuals. Given the importance of understanding knowledge sharing of individuals in knowledge-intensive businesses – but noting the lack of existing systematic, integrated research that focuses on individual-related factors influencing knowledge sharing – the purpose of this study was to fill the gap in the current literature. As such, the primary objective of this research was to identify and empirically investigate the individual-related factors influencing the Knowledge-sharing intention of individual employees in knowledge-intensive businesses. The literature review revealed twelve constructs, namely Individuals’ awareness, Intrinsic motivation, Extrinsic motivation, Transactional psychological contract breach, Relational psychological contract breach, Relationship conflict, Task conflict, Extraversion, Neuroticism, Openness to experience, Agreeableness and Conscientiousness that could influence the dependent variable Knowledge-sharing intention in knowledge-intensive businesses. Various moderating relationships between the dependent and independent variables were also proposed, while seven demographic variables (Age, Gender, Language, Highest qualification, Ethnic background, Organisational tenure and Job tenure of the respondent) were identified as potential control variables. Each construct in the hypothesised model of individual-related factors influencing Knowledge-sharing intention was defined and operationalised using items sourced from validated measuring instruments in previous studies. Several self-generated items based on secondary sources were also formulated. A structured questionnaire was made available to respondents identified by means of the convenience sampling technique, and the data collected from 597 usable questionnaires was subjected to various statistical analyses. An exploratory factor analysis (EFA) was conducted which confirmed the unique factors present in the data, and Cronbach-alpha coefficients were calculated to confirm the reliability of the measuring instrument. Structural equation modelling (SEM) was the main statistical procedure used to test the significance of the relationships hypothesised between the various independent and dependent variables. A subset of SEM, namely general linear modelling (GLM) was used to determine the influence of selected demographic variables on Knowledge-sharing intention and to assess various moderating relationships as proposed in the hypothesised model. The main findings of this study were that personality traits are strong predictors of individual employees‟ willingness to share knowledge, and that the maturity of individuals, in terms of realising the significance and value of sharing their knowledge with others, and in recognising the intrinsic benefits of sharing, influence Knowledge-sharing intention. The main limitations of the study were the use of a convenience sampling technique to collect the data, as well as the dependence of self-report by respondents, which could lead to response bias. This study has added to the body of knowledge management research, in particular knowledge-sharing research, by investigating selected individual-related factors influencing the Knowledge-sharing intention of individuals in a particular subset of businesses, namely knowledge-intensive businesses, and focusing on a particular type of knowledge, namely tacit knowledge. From a business‟s perspective, this study offers recommendations and suggestions for managing these individual-related factors in such a way as to increase knowledge sharing among employees, and as a result, the effectiveness and competitive advantage of knowledge-intensive businesses.
- Full Text:
- Date Issued: 2017
Inequality, social comparisons and minimum income aspirations: Evidence from South Africa
- Posel, Dorrit, Rogan, Michael
- Authors: Posel, Dorrit , Rogan, Michael
- Date: 2017
- Subjects: Economic development -- South Africa South Africa -- Economic conditions South Africa -- Social policy Economic development -- Political aspects -- South Africa
- Language: English
- Type: Book , Text
- Identifier: http://hdl.handle.net/10962/59510 , vital:27621 , ISBN 9780868106359 , DOI 10.21504/10962/59509
- Description: We investigate the formation of minimum income aspirations in South Africa, a country with high rates of poverty together with very high and rising rates of inequality. A number of empirical studies in both developed and developing countries have shown that income aspirations increase with the individual’s own income and with the income of others in their community, relationships which are explained by processes of adaptation through habituation and social comparison. However, the relationship between income aspirations and inequality has received far less empirical attention. We analyse the minimum income question (MIQ) asked in nationally representative household survey from 2008/2009 to test for evidence of aspirations failure among the poor in South Africa, and to investigate whether high levels of local inequality dampen or stimulate minimum income aspirations, and particularly among those living in poverty.
- Full Text:
- Date Issued: 2017
- Authors: Posel, Dorrit , Rogan, Michael
- Date: 2017
- Subjects: Economic development -- South Africa South Africa -- Economic conditions South Africa -- Social policy Economic development -- Political aspects -- South Africa
- Language: English
- Type: Book , Text
- Identifier: http://hdl.handle.net/10962/59510 , vital:27621 , ISBN 9780868106359 , DOI 10.21504/10962/59509
- Description: We investigate the formation of minimum income aspirations in South Africa, a country with high rates of poverty together with very high and rising rates of inequality. A number of empirical studies in both developed and developing countries have shown that income aspirations increase with the individual’s own income and with the income of others in their community, relationships which are explained by processes of adaptation through habituation and social comparison. However, the relationship between income aspirations and inequality has received far less empirical attention. We analyse the minimum income question (MIQ) asked in nationally representative household survey from 2008/2009 to test for evidence of aspirations failure among the poor in South Africa, and to investigate whether high levels of local inequality dampen or stimulate minimum income aspirations, and particularly among those living in poverty.
- Full Text:
- Date Issued: 2017