Assessment of some bacteria species isolated from woodlands of Raymond Mhlaba Local Municipality for high activity laccase production
- Authors: Gogotya, Asemahle
- Date: 2019
- Subjects: Laccase
- Language: English
- Type: Thesis , Masters , MSc (Microbiology)
- Identifier: http://hdl.handle.net/10353/19098 , vital:39879
- Description: The function of enzymes in keeping the earth clean is enormous; being executed in the biodegradation of different natural pollutants and biocatalysis of different responses by substituting the ecologically risky and harmful concoction impetuses offering a situation inviting option, laccases is an example of an enzyme described as it doesn’t produce harmful byproducts. Laccases are employed in several industrial processes that play a key responsibility in transformation of life and making the environment a better place. Bacteria have been described as best producers of laccases with a potential in the industrial scale processes. Laccase was produced from different bacterial isolates identified and named as Bacillus sp. strain GFN1 isolated from soil sample, Bacillus sp. strain GLN and Streptomyces sp. strain LAO both isolated from decaying wood samples in Raymond Mhlaba local municipality with accession numbers MK290988 to MK290990 respectively, as identified by partial sequencing, these were the best producers some of which were positive for Napthol and guaiacol; even upon quantitative screening they were better laccase producers. For quantitative laccase screening, 2,2'-azino-bis(3-ethylbenzothiazoline-6- sulphonic acid) was utilised as the substrate for laccase assays. These laccase producing bacteria were subjected to optimization of growth conditions using submerged fermentation which increased the activity of the produced laccase in great amounts. In optimizing basal medium growth conditions where laccase was harvested after every 72 hours where optimal activity was 16 obtained, studying several factors such as pH which turned out to be pH 5 for all isolates, effect of supplemented carbon and nitrogen sources with the be best being lactose and urea respectively with their effective concentrations using lignin as the main carbon and nitrogen source. Copper sulfate was used as the main inducer and the species preferred guaiacol and ferullic acid and the Fe2+ asthe best supplemented metal ion. The time course was done investigating parameters such as cell growth which was determined by observing the optical density, laccase activity, protein concentration and pH and the presented results suggested that when there was an increase in cell growth, enzyme activity decreased pH had no much effect on the enzyme production as it was almost stable all the time with protein concentration exhibiting no direct effect on enzyme activity also. Characterization of the crude enzyme was done to check the stability of the enzyme produced in various parameters. The enzymes produced by the different strains were thermophilic as they were able to withstand elevated temperatures between 90 and 100 C, with pH stability within an extensive variety of alkaline pH, typical of most bacterial laccases. Various metal ions affected the stability of the enzyme with CuSO4 increasing the stability of two of the bacterial enzyme and appeared to slightly decrease the stability of one enzyme. The studied inhibitors only decreased the stability on the enzyme and couldn’t completely inhibit the enzyme, and the enzymes showed specificity towards varying substrates. The studied bacterial laccases exhibit tremendous characteristics which are of great significance in the industries and will add to the novelty of bacterial laccases and their stability amongst the most studied fungal laccases.
- Full Text:
- Date Issued: 2019
- Authors: Gogotya, Asemahle
- Date: 2019
- Subjects: Laccase
- Language: English
- Type: Thesis , Masters , MSc (Microbiology)
- Identifier: http://hdl.handle.net/10353/19098 , vital:39879
- Description: The function of enzymes in keeping the earth clean is enormous; being executed in the biodegradation of different natural pollutants and biocatalysis of different responses by substituting the ecologically risky and harmful concoction impetuses offering a situation inviting option, laccases is an example of an enzyme described as it doesn’t produce harmful byproducts. Laccases are employed in several industrial processes that play a key responsibility in transformation of life and making the environment a better place. Bacteria have been described as best producers of laccases with a potential in the industrial scale processes. Laccase was produced from different bacterial isolates identified and named as Bacillus sp. strain GFN1 isolated from soil sample, Bacillus sp. strain GLN and Streptomyces sp. strain LAO both isolated from decaying wood samples in Raymond Mhlaba local municipality with accession numbers MK290988 to MK290990 respectively, as identified by partial sequencing, these were the best producers some of which were positive for Napthol and guaiacol; even upon quantitative screening they were better laccase producers. For quantitative laccase screening, 2,2'-azino-bis(3-ethylbenzothiazoline-6- sulphonic acid) was utilised as the substrate for laccase assays. These laccase producing bacteria were subjected to optimization of growth conditions using submerged fermentation which increased the activity of the produced laccase in great amounts. In optimizing basal medium growth conditions where laccase was harvested after every 72 hours where optimal activity was 16 obtained, studying several factors such as pH which turned out to be pH 5 for all isolates, effect of supplemented carbon and nitrogen sources with the be best being lactose and urea respectively with their effective concentrations using lignin as the main carbon and nitrogen source. Copper sulfate was used as the main inducer and the species preferred guaiacol and ferullic acid and the Fe2+ asthe best supplemented metal ion. The time course was done investigating parameters such as cell growth which was determined by observing the optical density, laccase activity, protein concentration and pH and the presented results suggested that when there was an increase in cell growth, enzyme activity decreased pH had no much effect on the enzyme production as it was almost stable all the time with protein concentration exhibiting no direct effect on enzyme activity also. Characterization of the crude enzyme was done to check the stability of the enzyme produced in various parameters. The enzymes produced by the different strains were thermophilic as they were able to withstand elevated temperatures between 90 and 100 C, with pH stability within an extensive variety of alkaline pH, typical of most bacterial laccases. Various metal ions affected the stability of the enzyme with CuSO4 increasing the stability of two of the bacterial enzyme and appeared to slightly decrease the stability of one enzyme. The studied inhibitors only decreased the stability on the enzyme and couldn’t completely inhibit the enzyme, and the enzymes showed specificity towards varying substrates. The studied bacterial laccases exhibit tremendous characteristics which are of great significance in the industries and will add to the novelty of bacterial laccases and their stability amongst the most studied fungal laccases.
- Full Text:
- Date Issued: 2019
Assessment of Supply Chain Corruption in the three Metropolitan Municipalities in the Gauteng Province of South Africa
- Authors: Sisi, Molebedi Gordon
- Date: 2019
- Subjects: Government purchasing -- South Africa Political corruption Municipal services
- Language: English
- Type: Thesis , Doctoral , D.Admin
- Identifier: http://hdl.handle.net/10353/14104 , vital:39844
- Description: The aim of the current study was to assess the supply chain corruption in the three metropolitan municipalities in the Gauteng Province of South Africa. Core to the assessment was to establish the causes and ramifications of supply chain corruption as well as the nature and extent of supply chain corruption in the three metropolitan municipalities. In order to meet the objectives of the current the study, a qualitative research approach underpinned by ethics and accountability theories was used. The study employed interviews and observation as a primary source of data collection as well as document review in a form of government documents, legislation and court case decisions as secondary source of data, which were then thematically analysed. The study pointed out that while supply chain corruption certainly negatively affects the day-to-day running of public affairs, it is actually the collapse of ethical behaviour together with the failure to uphold accountability and consequence management that has created fertile ground for supply chain corruption. It further, purported that in order to combat the scourge of supply chain corruption in all its manifestations, there is a need to install a Central Supplier Database application, which has been sufficiently tested to determine its effectiveness as blacklisted companies and their directors have a way of masquerading in another form, to do business with the state. South Africa needs the embodiment of ethical behaviour from its citizenry, along with anti-corruption policy enforcement and consequence management. The Kanyane Ethics Architecture should be launched in municipalities across the board as a comprehensive and all-encompassing mix model to prevent supply chain corruption, in its various manifestations, from taking place.
- Full Text:
- Date Issued: 2019
- Authors: Sisi, Molebedi Gordon
- Date: 2019
- Subjects: Government purchasing -- South Africa Political corruption Municipal services
- Language: English
- Type: Thesis , Doctoral , D.Admin
- Identifier: http://hdl.handle.net/10353/14104 , vital:39844
- Description: The aim of the current study was to assess the supply chain corruption in the three metropolitan municipalities in the Gauteng Province of South Africa. Core to the assessment was to establish the causes and ramifications of supply chain corruption as well as the nature and extent of supply chain corruption in the three metropolitan municipalities. In order to meet the objectives of the current the study, a qualitative research approach underpinned by ethics and accountability theories was used. The study employed interviews and observation as a primary source of data collection as well as document review in a form of government documents, legislation and court case decisions as secondary source of data, which were then thematically analysed. The study pointed out that while supply chain corruption certainly negatively affects the day-to-day running of public affairs, it is actually the collapse of ethical behaviour together with the failure to uphold accountability and consequence management that has created fertile ground for supply chain corruption. It further, purported that in order to combat the scourge of supply chain corruption in all its manifestations, there is a need to install a Central Supplier Database application, which has been sufficiently tested to determine its effectiveness as blacklisted companies and their directors have a way of masquerading in another form, to do business with the state. South Africa needs the embodiment of ethical behaviour from its citizenry, along with anti-corruption policy enforcement and consequence management. The Kanyane Ethics Architecture should be launched in municipalities across the board as a comprehensive and all-encompassing mix model to prevent supply chain corruption, in its various manifestations, from taking place.
- Full Text:
- Date Issued: 2019
Assessment Of Supply Chain Corruption In The Three Metropolitan Municipalities, Gauteng Province Of South Africa
- Authors: Sisi, Molebedi Gordon
- Date: 2019
- Subjects: Government purchasing Political corruption| Municipal government
- Language: English
- Type: Thesis , Doctoral , PhD(Public Administration)
- Identifier: http://hdl.handle.net/10353/8343 , vital:32300
- Description: The aim of the current study was to assess the supply chain corruption in the three metropolitan municipalities in the Gauteng Province of South Africa. Core to the assessment was to establish the causes and ramifications of supply chain corruption as well as the nature and extent of supply chain corruption in the three metropolitan municipalities. In order to meet the objectives of the current the study, a qualitative research approach underpinned by ethics and accountability theories was used. The study employed interviews and observation as a primary source of data collection as well as document review in a form of government documents, legislation and court case decisions as secondary source of data, which were then thematically analysed. The study pointed out that while supply chain corruption certainly negatively affects the day-to-day running of public affairs, it is actually the collapse of ethical behaviour together with the failure to uphold accountability and consequence management that has created fertile ground for supply chain corruption. It further, purported that in order to combat the scourge of supply chain corruption in all its manifestations, there is a need to install a Central Supplier Database application, which has been sufficiently tested to determine its effectiveness as blacklisted companies and their directors have a way of masquerading in another form, to do business with the state. South Africa needs the embodiment of ethical behaviour from its citizenry, along with anti-corruption policy enforcement and consequence management. The Kanyane Ethics Architecture should be launched in municipalities across the board as a comprehensive and all-encompassing mix model to prevent supply chain corruption, in its various manifestations, from taking place.
- Full Text:
- Date Issued: 2019
- Authors: Sisi, Molebedi Gordon
- Date: 2019
- Subjects: Government purchasing Political corruption| Municipal government
- Language: English
- Type: Thesis , Doctoral , PhD(Public Administration)
- Identifier: http://hdl.handle.net/10353/8343 , vital:32300
- Description: The aim of the current study was to assess the supply chain corruption in the three metropolitan municipalities in the Gauteng Province of South Africa. Core to the assessment was to establish the causes and ramifications of supply chain corruption as well as the nature and extent of supply chain corruption in the three metropolitan municipalities. In order to meet the objectives of the current the study, a qualitative research approach underpinned by ethics and accountability theories was used. The study employed interviews and observation as a primary source of data collection as well as document review in a form of government documents, legislation and court case decisions as secondary source of data, which were then thematically analysed. The study pointed out that while supply chain corruption certainly negatively affects the day-to-day running of public affairs, it is actually the collapse of ethical behaviour together with the failure to uphold accountability and consequence management that has created fertile ground for supply chain corruption. It further, purported that in order to combat the scourge of supply chain corruption in all its manifestations, there is a need to install a Central Supplier Database application, which has been sufficiently tested to determine its effectiveness as blacklisted companies and their directors have a way of masquerading in another form, to do business with the state. South Africa needs the embodiment of ethical behaviour from its citizenry, along with anti-corruption policy enforcement and consequence management. The Kanyane Ethics Architecture should be launched in municipalities across the board as a comprehensive and all-encompassing mix model to prevent supply chain corruption, in its various manifestations, from taking place.
- Full Text:
- Date Issued: 2019
Assessment of the municipal support and intervention programme in selected municipalities of the Eastern Cape
- Authors: Ngwadi, Mzamo
- Date: 2019
- Subjects: Municipal services Public administration|
- Language: English
- Type: Thesis , Doctoral , D.Admin
- Identifier: http://hdl.handle.net/10353/17061 , vital:40844
- Description: The study assesses the outcomes and impact of Municipal Support and Intervention Programme which was implemented in the study sites of Blue Crane Route and Kouga Local Municipalities, which are falling under Sarah Baartman District Municipality, in the Province of Eastern Cape, in the Republic of South Africa. The researcher’s study is an attempt to pursue and record the foot-prints left by Municipal Support and Intervention Programme (MSIP) in these study sites in order to determine the potential extended implementation of the programme in other municipalities with similar challenges of political instability, poor governance, poor audit opinions, unsound financial management systems leading to poor and unsustainable municipal service delivery. The Department of Co-operative Governance and Traditional Affairs (COGTA) conducted a diagnosis on the performance of the then 45municipalities (2007/08 Financial Year) and identified challenges of similar nature but different degrees in fifteen municipalities from the erstwhile Transkei Administration. The municipalities comprised: 2 Metropolitans, 37 Locals and 6 Districts. The diagnostic results compelled COGTA and National Treasury to develop a Municipal Support and Intervention Framework (MSIF) which was piloted in those 15 municipalities then and later adopted as a fully-fledged programme, referred to above as MSIP by the Member of Executive Committee (MEC) for COGTA and Mayors in September, 2014 at Komani (Queenstown). x The concern of the researcher is, in spite of numerous efforts by National and Provincial Departments and Treasuries, it has been observed that some municipalities are still faced with challenges of political instability, poor governance and unsound financial management/financial variability which result to poor municipal service delivery. The latter challenges manifest themselves in protests by the citizenry, poor external audit results due to ineffective political oversight coupled with the lack of scarce and critical professional technical skills. A review of existing literature assists the researcher to identify the key concepts of relevance to the study and assists the investigator to become knowledgeable to the limits, challenges and the language of the type of the research they plan to conduct. The research questions or hypothesis are as follows: • What is the understanding of Municipal Support and Intervention Programme by Blue Crane Route and Kouga Local Municipalities towards service delivery? • Which factors have influenced the effectiveness of the implementation of Municipal Support and Intervention Programme in Blue Crane Route and Kouga Local Municipalities? • What are the recommendations for improved implementation of Municipal Support and Intervention Programme in Blue Crane Route and Kouga Local Municipalities? The aim of this study is to assess the impact of Municipal Support and Intervention Programme (MSIP) Implementation by the Provincial Administration at the municipal level, with special reference to Blue Crane Route and Kouga Municipalities. The objectives of the research are: xi • To explore understanding of the Municipal Support and Intervention Programme in Blue Crane Route and Kouga Local Municipalities. • To explore the factors which influence the effectiveness of the Municipal Support and Intervention Programme in Blue Crane Route and Kouga Local Municipalities • To explore some findings on the study of Municipal Support and Intervention Programme in Blue Crane Route and Kouga Local Municipalities. • To explore recommendations towards improving the implementation of the Municipal Support and Intervention Programme in Blue Crane Route and Kouga Local Municipalities. Qualitative and Quantitative Methodologies were utilised for data gathering in the two study sites. The study concluded that when the above-mentioned challenges are existing in a municipality, they will manifest themselves through the demonstrations by citizenry which sometimes lead to damage of infrastructure. It is therefore, recommended that the three spheres of government should go back to the drawing board when deploying councillors in municipality by considering basic relevant educational qualifications because the Local Government Sector is highly legislated and complicated. The learning curve is sometimes a bit longer during a five-year elections term. This should be the same considerations when technocrats are being appointed at the level of Section 54 and 56, in terms of Municipal Systems Act, No. 32 of 2000, especially in the area of scarce and critical professional skills. In the case of educational, training and development gaps, the National Department of Co-operative Governance, National Treasury and the South African Local Government Association (SALGA), could enhance upskilling supporting politicians and municipal senior managers with accredited and refresher courses
- Full Text:
- Date Issued: 2019
- Authors: Ngwadi, Mzamo
- Date: 2019
- Subjects: Municipal services Public administration|
- Language: English
- Type: Thesis , Doctoral , D.Admin
- Identifier: http://hdl.handle.net/10353/17061 , vital:40844
- Description: The study assesses the outcomes and impact of Municipal Support and Intervention Programme which was implemented in the study sites of Blue Crane Route and Kouga Local Municipalities, which are falling under Sarah Baartman District Municipality, in the Province of Eastern Cape, in the Republic of South Africa. The researcher’s study is an attempt to pursue and record the foot-prints left by Municipal Support and Intervention Programme (MSIP) in these study sites in order to determine the potential extended implementation of the programme in other municipalities with similar challenges of political instability, poor governance, poor audit opinions, unsound financial management systems leading to poor and unsustainable municipal service delivery. The Department of Co-operative Governance and Traditional Affairs (COGTA) conducted a diagnosis on the performance of the then 45municipalities (2007/08 Financial Year) and identified challenges of similar nature but different degrees in fifteen municipalities from the erstwhile Transkei Administration. The municipalities comprised: 2 Metropolitans, 37 Locals and 6 Districts. The diagnostic results compelled COGTA and National Treasury to develop a Municipal Support and Intervention Framework (MSIF) which was piloted in those 15 municipalities then and later adopted as a fully-fledged programme, referred to above as MSIP by the Member of Executive Committee (MEC) for COGTA and Mayors in September, 2014 at Komani (Queenstown). x The concern of the researcher is, in spite of numerous efforts by National and Provincial Departments and Treasuries, it has been observed that some municipalities are still faced with challenges of political instability, poor governance and unsound financial management/financial variability which result to poor municipal service delivery. The latter challenges manifest themselves in protests by the citizenry, poor external audit results due to ineffective political oversight coupled with the lack of scarce and critical professional technical skills. A review of existing literature assists the researcher to identify the key concepts of relevance to the study and assists the investigator to become knowledgeable to the limits, challenges and the language of the type of the research they plan to conduct. The research questions or hypothesis are as follows: • What is the understanding of Municipal Support and Intervention Programme by Blue Crane Route and Kouga Local Municipalities towards service delivery? • Which factors have influenced the effectiveness of the implementation of Municipal Support and Intervention Programme in Blue Crane Route and Kouga Local Municipalities? • What are the recommendations for improved implementation of Municipal Support and Intervention Programme in Blue Crane Route and Kouga Local Municipalities? The aim of this study is to assess the impact of Municipal Support and Intervention Programme (MSIP) Implementation by the Provincial Administration at the municipal level, with special reference to Blue Crane Route and Kouga Municipalities. The objectives of the research are: xi • To explore understanding of the Municipal Support and Intervention Programme in Blue Crane Route and Kouga Local Municipalities. • To explore the factors which influence the effectiveness of the Municipal Support and Intervention Programme in Blue Crane Route and Kouga Local Municipalities • To explore some findings on the study of Municipal Support and Intervention Programme in Blue Crane Route and Kouga Local Municipalities. • To explore recommendations towards improving the implementation of the Municipal Support and Intervention Programme in Blue Crane Route and Kouga Local Municipalities. Qualitative and Quantitative Methodologies were utilised for data gathering in the two study sites. The study concluded that when the above-mentioned challenges are existing in a municipality, they will manifest themselves through the demonstrations by citizenry which sometimes lead to damage of infrastructure. It is therefore, recommended that the three spheres of government should go back to the drawing board when deploying councillors in municipality by considering basic relevant educational qualifications because the Local Government Sector is highly legislated and complicated. The learning curve is sometimes a bit longer during a five-year elections term. This should be the same considerations when technocrats are being appointed at the level of Section 54 and 56, in terms of Municipal Systems Act, No. 32 of 2000, especially in the area of scarce and critical professional skills. In the case of educational, training and development gaps, the National Department of Co-operative Governance, National Treasury and the South African Local Government Association (SALGA), could enhance upskilling supporting politicians and municipal senior managers with accredited and refresher courses
- Full Text:
- Date Issued: 2019
Assessment of the role of the board of directors in the implementation of corporate governance in the state owned entities: a case in the Eastern Cape Province
- Authors: Makhala, Nombuyiselo
- Date: 2019
- Subjects: Corporate governance Directors of corporations
- Language: English
- Type: Thesis , Doctoral , D.Admin
- Identifier: http://hdl.handle.net/10353/13642 , vital:39687
- Description: Corporate governance is a well-recognized governing method, which ensures that the organization achieves its goals. This concept has received too much attention due to the number of reported corporate scandals in both public and private entities. Due to these highly publicized governance failures, the role of Board of Directors in the implementation of corporate governance has been questioned. Their role has been the topic of interest. The main aim of this study was to assess the role of the Board of Directors in the implementation of Corporate Governance in the State Owned Entities in the Eastern Cape Province. It also aimed to determine the strategies and mechanisms that can be used to enhance the role played by the Board of directors in the successful implementation of corporate governance in the public entities. This research was qualitative in nature and as part of this approach data was gathered through questionnaires and interviews. For this study, small scale and manageable sample was used. The sample was selected with the view that all the participants selected were experienced and directly involved in the policy and decision-making as well as in implementation of corporate governance in the state-owned entities. The secondary data was collected through the audit reports, performance, and annual reports of the different public entities. The findings of this study revealed that some Board of Directors are unable to play the effective role in the implementation of corporate governance due to lack of experience and skills required. The research has also revealed that the Boards are not effective in their role due to lax in enforcing accountability by the shareholder. The findings on poor performance management of the Boards is because of no standardized performance management system for the Eastern Cape Province public entities in place. Political deployment of board members had an impact in the independency and objectivity of the boards. The study recommends the appointment of skilled and qualifying board members, training and induction of newly appointed be conducted. Development of accountability framework for all the boards of the public entities in the Eastern Cape. For the Boards to successfully play an effective role in the implementation of corporate governance, adequate budget should be allocated to the public entities. Lastly, the development of the standardized performance management system and framework with prescribed key responsibility areas for all the Boards of the state owned entities will assist the Boards in knowing what is expected of them.
- Full Text:
- Date Issued: 2019
- Authors: Makhala, Nombuyiselo
- Date: 2019
- Subjects: Corporate governance Directors of corporations
- Language: English
- Type: Thesis , Doctoral , D.Admin
- Identifier: http://hdl.handle.net/10353/13642 , vital:39687
- Description: Corporate governance is a well-recognized governing method, which ensures that the organization achieves its goals. This concept has received too much attention due to the number of reported corporate scandals in both public and private entities. Due to these highly publicized governance failures, the role of Board of Directors in the implementation of corporate governance has been questioned. Their role has been the topic of interest. The main aim of this study was to assess the role of the Board of Directors in the implementation of Corporate Governance in the State Owned Entities in the Eastern Cape Province. It also aimed to determine the strategies and mechanisms that can be used to enhance the role played by the Board of directors in the successful implementation of corporate governance in the public entities. This research was qualitative in nature and as part of this approach data was gathered through questionnaires and interviews. For this study, small scale and manageable sample was used. The sample was selected with the view that all the participants selected were experienced and directly involved in the policy and decision-making as well as in implementation of corporate governance in the state-owned entities. The secondary data was collected through the audit reports, performance, and annual reports of the different public entities. The findings of this study revealed that some Board of Directors are unable to play the effective role in the implementation of corporate governance due to lack of experience and skills required. The research has also revealed that the Boards are not effective in their role due to lax in enforcing accountability by the shareholder. The findings on poor performance management of the Boards is because of no standardized performance management system for the Eastern Cape Province public entities in place. Political deployment of board members had an impact in the independency and objectivity of the boards. The study recommends the appointment of skilled and qualifying board members, training and induction of newly appointed be conducted. Development of accountability framework for all the boards of the public entities in the Eastern Cape. For the Boards to successfully play an effective role in the implementation of corporate governance, adequate budget should be allocated to the public entities. Lastly, the development of the standardized performance management system and framework with prescribed key responsibility areas for all the Boards of the state owned entities will assist the Boards in knowing what is expected of them.
- Full Text:
- Date Issued: 2019
Asymmetrical and symmetrical zinc phthalocyanine-cobalt ferrite conjugates embedded in electrospun fibers for dual photocatalytic degradation of azo dyes: Methyl Orange and Orange G
- Mapukata, Sivuyisiwe, Kobayashi, Nagao, Kimura, Mutsumi, Nyokong, Tebello
- Authors: Mapukata, Sivuyisiwe , Kobayashi, Nagao , Kimura, Mutsumi , Nyokong, Tebello
- Date: 2019
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/186960 , vital:44551 , xlink:href="https://doi.org/10.1016/j.jphotochem.2019.04.048"
- Description: The conjugation of a symmetrical and an asymmetrical zinc phthalocyanine with amine functionalised cobalt ferrite magnetic nanoparticles (CoFe MNPs) for enhanced photophysics and photocatalysis is reported. The MNPs, 2-[5-(phenoxy)-isophthalic acid] 9(10), 16(17), 23(24)-tris (tertbutyl) phthalocyaninato Zn (II) (2) and 2, 10, 16, 24 – tetra 5-(phenoxy)-isophthalic acid phthalocyaninato] Zn (II) (3) as well as their respective conjugates are embedded into electrospun polyamide-6 (PA-6) fibers for support and catalyst regeneration. The resulting photocatalyts (CoFe/PA-6, 2/PA-6, 3/PA-6, CoFe-2/PA-6, and CoFe-3/PA-6) were compared based on their photophysical properties and photocatalytic efficiencies in degrading azo dyes; Methyl Orange (MO) and Orange G (OG). CoFe-2/PA-6 and CoFe-3/PA-6 were found to be more effective photocatalysts than their respective electrospun Pcs and MNPs. The degradation of OG was found to follow pseudo first order kinetics and the Langmuir–Hinshelwood model while that of MO does not.
- Full Text:
- Date Issued: 2019
- Authors: Mapukata, Sivuyisiwe , Kobayashi, Nagao , Kimura, Mutsumi , Nyokong, Tebello
- Date: 2019
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/186960 , vital:44551 , xlink:href="https://doi.org/10.1016/j.jphotochem.2019.04.048"
- Description: The conjugation of a symmetrical and an asymmetrical zinc phthalocyanine with amine functionalised cobalt ferrite magnetic nanoparticles (CoFe MNPs) for enhanced photophysics and photocatalysis is reported. The MNPs, 2-[5-(phenoxy)-isophthalic acid] 9(10), 16(17), 23(24)-tris (tertbutyl) phthalocyaninato Zn (II) (2) and 2, 10, 16, 24 – tetra 5-(phenoxy)-isophthalic acid phthalocyaninato] Zn (II) (3) as well as their respective conjugates are embedded into electrospun polyamide-6 (PA-6) fibers for support and catalyst regeneration. The resulting photocatalyts (CoFe/PA-6, 2/PA-6, 3/PA-6, CoFe-2/PA-6, and CoFe-3/PA-6) were compared based on their photophysical properties and photocatalytic efficiencies in degrading azo dyes; Methyl Orange (MO) and Orange G (OG). CoFe-2/PA-6 and CoFe-3/PA-6 were found to be more effective photocatalysts than their respective electrospun Pcs and MNPs. The degradation of OG was found to follow pseudo first order kinetics and the Langmuir–Hinshelwood model while that of MO does not.
- Full Text:
- Date Issued: 2019
Attachment styles, coping strategies, personal meaning, and mental health in nonclinical adults
- Authors: Gerber, Ora
- Date: 2019
- Subjects: Attachment behavior -- South Africa , Mental illness -- South Africa Psychology, Applied
- Language: English
- Type: Thesis , Doctoral , DPhil
- Identifier: http://hdl.handle.net/10948/30485 , vital:30950
- Description: Meaning in life can be attained through a variety of sources. A limited amount of research has investigated the association between attachment and personal meaning while no studies have investigated the association between attachment, personal meaning, and sources of meaning. The current study aimed to investigate the association between different attachment styles, personal meaning, and sources of meaning in order to develop a deeper understanding of their relationships. A quantitative exploratory-descriptive design was used to collect the data using standardized questionnaires from 226 participants. Statistical analysis of the data suggests that a secure attachment style is positively associated with personal meaning and presented with meaning sources consisting of breadth and depth. A fearful attachment style was associated with a lack of personal meaning and sources of meaning while a preoccupied attachment style was associated with a lack of personal meaning and presented with sources of meaning lacking in depth and breadth. No significant association was found between a dismissive attachment style and personal meaning, but associations were found with sources of meaning, including feeling financially secure, experiencing personal growth, meeting basic everyday needs, and leaving a legacy for the next generation. Recommendations for psychotherapy based on the findings of the study were offered.
- Full Text:
- Date Issued: 2019
- Authors: Gerber, Ora
- Date: 2019
- Subjects: Attachment behavior -- South Africa , Mental illness -- South Africa Psychology, Applied
- Language: English
- Type: Thesis , Doctoral , DPhil
- Identifier: http://hdl.handle.net/10948/30485 , vital:30950
- Description: Meaning in life can be attained through a variety of sources. A limited amount of research has investigated the association between attachment and personal meaning while no studies have investigated the association between attachment, personal meaning, and sources of meaning. The current study aimed to investigate the association between different attachment styles, personal meaning, and sources of meaning in order to develop a deeper understanding of their relationships. A quantitative exploratory-descriptive design was used to collect the data using standardized questionnaires from 226 participants. Statistical analysis of the data suggests that a secure attachment style is positively associated with personal meaning and presented with meaning sources consisting of breadth and depth. A fearful attachment style was associated with a lack of personal meaning and sources of meaning while a preoccupied attachment style was associated with a lack of personal meaning and presented with sources of meaning lacking in depth and breadth. No significant association was found between a dismissive attachment style and personal meaning, but associations were found with sources of meaning, including feeling financially secure, experiencing personal growth, meeting basic everyday needs, and leaving a legacy for the next generation. Recommendations for psychotherapy based on the findings of the study were offered.
- Full Text:
- Date Issued: 2019
Attitudes of healthcare professionals towards substance dependent Clients who have relapsed
- Authors: Yokwe, Zintle
- Date: 2019
- Subjects: Substance abuse -- Relapse , Substance abuse -- Psychological aspects Attitude (Psychology) Psychologists -- South Africa -- Attitudes
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10948/44345 , vital:37156
- Description: Relapse has been identified as a major problem when it comes to substancedependence. Research focusing on substance-dependence has found that substance users are at risk of relapsing after attending treatment, whether receiving out-patient or in-patient services. Healthcare professionals are seen as playing a crucial role when it comes to assisting substance-dependence clients; hence their attitudes when working with these clients are considered important. This study explored the attitudes of healthcare professionals when it came to working with substance-dependent clients who had relapsed. The study further explored whether the attitudes held by the healthcare professionals affected the treatment interventions or plans implemented. The study adopted the theory of planned behavior as a theoretical framework, and a qualitative research methodology was used. Nine participants (four social workers, one nurse, one drug counsellor, one psychologist and one registered counsellor) made up the research sample. A combination of convenience and purposive sampling techniques was used. Data was transcribed verbatim and analysed using thematic analysis. The findings of the study indicated that healthcare professionals displayed both positive and negatives attitudes when working with substance-dependent clients who had relapsed. The findings of the study showed that although some of the healthcare professionals displayed negative attitudes when clients relapsed, they still believed that their clients could recover and were committed to assisting them. The findings showed that healthcare professionals who worked with substance-dependent clients who had relapsed were influenced by the confidence they had in working with substance-dependence clients, their experiences, the client’s attitudes and level of motivation, as well as the client’s reasons for relapsing. This study also described the different treatment interventions healthcare professionals implemented when working with relapsed clients. Based on the conclusions made, it is important for healthcare professionals to have the relevant education, knowledge and experience that is needed to work with substance-dependence and relapse. The importance of healthcare professionals’ awareness of their attitudes and how these affect their behavior when working with substance-dependence was noted. It is recommend that similar studies are conducted in provinces or cities that have been identified to have high levels of substance-dependence relapse. Identifying healthcare professionals’ attitudes from these regions could result in more knowledge.
- Full Text:
- Date Issued: 2019
- Authors: Yokwe, Zintle
- Date: 2019
- Subjects: Substance abuse -- Relapse , Substance abuse -- Psychological aspects Attitude (Psychology) Psychologists -- South Africa -- Attitudes
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10948/44345 , vital:37156
- Description: Relapse has been identified as a major problem when it comes to substancedependence. Research focusing on substance-dependence has found that substance users are at risk of relapsing after attending treatment, whether receiving out-patient or in-patient services. Healthcare professionals are seen as playing a crucial role when it comes to assisting substance-dependence clients; hence their attitudes when working with these clients are considered important. This study explored the attitudes of healthcare professionals when it came to working with substance-dependent clients who had relapsed. The study further explored whether the attitudes held by the healthcare professionals affected the treatment interventions or plans implemented. The study adopted the theory of planned behavior as a theoretical framework, and a qualitative research methodology was used. Nine participants (four social workers, one nurse, one drug counsellor, one psychologist and one registered counsellor) made up the research sample. A combination of convenience and purposive sampling techniques was used. Data was transcribed verbatim and analysed using thematic analysis. The findings of the study indicated that healthcare professionals displayed both positive and negatives attitudes when working with substance-dependent clients who had relapsed. The findings of the study showed that although some of the healthcare professionals displayed negative attitudes when clients relapsed, they still believed that their clients could recover and were committed to assisting them. The findings showed that healthcare professionals who worked with substance-dependent clients who had relapsed were influenced by the confidence they had in working with substance-dependence clients, their experiences, the client’s attitudes and level of motivation, as well as the client’s reasons for relapsing. This study also described the different treatment interventions healthcare professionals implemented when working with relapsed clients. Based on the conclusions made, it is important for healthcare professionals to have the relevant education, knowledge and experience that is needed to work with substance-dependence and relapse. The importance of healthcare professionals’ awareness of their attitudes and how these affect their behavior when working with substance-dependence was noted. It is recommend that similar studies are conducted in provinces or cities that have been identified to have high levels of substance-dependence relapse. Identifying healthcare professionals’ attitudes from these regions could result in more knowledge.
- Full Text:
- Date Issued: 2019
Augmentative releases of Dactylopius austrinus De Lotto (Dactylopiidae; Hemiptera) for biological control of Opuntia aurantiaca Lindley (Cactaceae), in South Africa
- Authors: Mulateli, Thifhelimbilu
- Date: 2019
- Subjects: Opuntia aurantiaca -- Biolotical control -- South Africa , Invasive plants -- Biolotical control -- South Africa , Dactylopius austrinus De Lotto -- South Africa , Dactylopius -- South Africa
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/92931 , vital:30765
- Description: Opuntia aurantiaca Lindely (Cactaceae) is an invasive alien cactus which has detrimental effects on agroecosystems and indigenous biodiversity in South Africa. Dense infestations over large areas reduce grazing capacity and indigenous biodiversity. Despite the release of a biological control agent, the cochineal insect Dactylopius austrinus De Lotto (Dactylopiidae), the weed is still considered a major problem in many parts of the country. Biological control has relied heavily on classical biological control, with little augmentative biological control implemented. This study investigated the outcome of mass-rearing and augmentative releases of D. austrinus for the control of O. aurantiaca. Augmentative releases are thought to improve the level of control by increasing agent densities in the field and thus increasing the level of damage inflicted to the plants. All data were collected with the intention to optimize release strategies so that the maximum benefit from the biological control agent could be achieved. An impact study was conducted using potted plants in a greenhouse to quantify the efficacy of multiple releases of the agent on the target weed. All three of the release treatments showed consistently higher proportion of cochineal than the controls, as well as the insect exclusion treatments, and these differences were statistically significant. The number of cladodes per plant increased significantly for the insect exclusion and control treatment over the period of the study, whilst all three release treatments decreased steadily over the same period. This study indicated that the agent is damaging to O. aurantiaca and that a single release event was beneficial but that multiple releases did not result in greater levels of control. A post-release evaluation was carried out to quantify the impact of releases of D. austrinus on O. aurantiaca in the field. Plots where the agent was excluded were compared with those where the agent was left at natural field densities and three treatments where agent populations were augmented to varying degrees through releases. The percentage of cochineal infested cladodes for all treatments decreased over time from the initiation of the experiment in October 2017 until the end of the experiment in October 2018. Opuntia aurantiaca densities also decreased over time for all treatments. The insect exclusion treatment had the greatest number of plants for the duration of the study, but this was not significantly different from other treatments. Dactylopius austrinus was damaging to O. aurantiaca, but climatic conditions in the field limited the efficacy of releases. Although O. aurantiaca density decreased during the experiment, it was evident that the reduced number of plants was not due to augmentation of the cochineal populations from the releases that were conducted. The experiment was conducted over a very dry period, when cochineal was particularly effective, so although augmentative releases did not improve the level of control, the natural population of cochineal was high and very damaging to O. aurantiaca over the course of the experiment. Releasing during wet periods, when the agent is less effective, could augment agent populations at a time when natural populations would be low, and hence improve levels of control further. Although this study was limited to a short period of two years, the results of this study suggest that the number of releases is less important than the timing of releases. Releasing immediately after periods of high rainfall is likely to be beneficial, while releasing during dry periods, or during winter when temperatures are low, is less effective. Dactylopius austrinus populations should be constantly monitored so that releases can be conducted when cochineal populations are low and the climatic conditions are correct. If the timing of release events is appropriate, then the over level of control of O. aurantiaca using D. austrinus could be improved.
- Full Text:
- Date Issued: 2019
- Authors: Mulateli, Thifhelimbilu
- Date: 2019
- Subjects: Opuntia aurantiaca -- Biolotical control -- South Africa , Invasive plants -- Biolotical control -- South Africa , Dactylopius austrinus De Lotto -- South Africa , Dactylopius -- South Africa
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/92931 , vital:30765
- Description: Opuntia aurantiaca Lindely (Cactaceae) is an invasive alien cactus which has detrimental effects on agroecosystems and indigenous biodiversity in South Africa. Dense infestations over large areas reduce grazing capacity and indigenous biodiversity. Despite the release of a biological control agent, the cochineal insect Dactylopius austrinus De Lotto (Dactylopiidae), the weed is still considered a major problem in many parts of the country. Biological control has relied heavily on classical biological control, with little augmentative biological control implemented. This study investigated the outcome of mass-rearing and augmentative releases of D. austrinus for the control of O. aurantiaca. Augmentative releases are thought to improve the level of control by increasing agent densities in the field and thus increasing the level of damage inflicted to the plants. All data were collected with the intention to optimize release strategies so that the maximum benefit from the biological control agent could be achieved. An impact study was conducted using potted plants in a greenhouse to quantify the efficacy of multiple releases of the agent on the target weed. All three of the release treatments showed consistently higher proportion of cochineal than the controls, as well as the insect exclusion treatments, and these differences were statistically significant. The number of cladodes per plant increased significantly for the insect exclusion and control treatment over the period of the study, whilst all three release treatments decreased steadily over the same period. This study indicated that the agent is damaging to O. aurantiaca and that a single release event was beneficial but that multiple releases did not result in greater levels of control. A post-release evaluation was carried out to quantify the impact of releases of D. austrinus on O. aurantiaca in the field. Plots where the agent was excluded were compared with those where the agent was left at natural field densities and three treatments where agent populations were augmented to varying degrees through releases. The percentage of cochineal infested cladodes for all treatments decreased over time from the initiation of the experiment in October 2017 until the end of the experiment in October 2018. Opuntia aurantiaca densities also decreased over time for all treatments. The insect exclusion treatment had the greatest number of plants for the duration of the study, but this was not significantly different from other treatments. Dactylopius austrinus was damaging to O. aurantiaca, but climatic conditions in the field limited the efficacy of releases. Although O. aurantiaca density decreased during the experiment, it was evident that the reduced number of plants was not due to augmentation of the cochineal populations from the releases that were conducted. The experiment was conducted over a very dry period, when cochineal was particularly effective, so although augmentative releases did not improve the level of control, the natural population of cochineal was high and very damaging to O. aurantiaca over the course of the experiment. Releasing during wet periods, when the agent is less effective, could augment agent populations at a time when natural populations would be low, and hence improve levels of control further. Although this study was limited to a short period of two years, the results of this study suggest that the number of releases is less important than the timing of releases. Releasing immediately after periods of high rainfall is likely to be beneficial, while releasing during dry periods, or during winter when temperatures are low, is less effective. Dactylopius austrinus populations should be constantly monitored so that releases can be conducted when cochineal populations are low and the climatic conditions are correct. If the timing of release events is appropriate, then the over level of control of O. aurantiaca using D. austrinus could be improved.
- Full Text:
- Date Issued: 2019
Automatic termination clauses in employment contracts
- Authors: Ndzendze, Kutala
- Date: 2019
- Subjects: Labor contract -- South Africa , Employees -- Dismissal of -- Law and legislation -- South Africa Unfair labor practices -- South Africa
- Language: English
- Type: Thesis , Masters , LLM
- Identifier: http://hdl.handle.net/10948/41808 , vital:36594
- Description: This study aims to establish Automatic Termination Clauses in Employment contracts by analyzing the provisions of the Constitution of the Republic of South Africa, Labour Relations Act and the precedents. The automatic termination of employment contract means that the contract is terminated without giving an employee the opportunity to state his or her version as per the audi alteram partem principle. In essence, the employee is deprived of his or her right to a fair dismissal as outlined in the Labour Relations Act. The automatic termination clauses in employment contract means that the employment contract will come to an end when the employee’s services are no longer required or when the employer simply does no longer want to keep the employee at work. The Constitution of the Republic of South Africa provides that “everyone has the right to fair labour practices”.1 In terms of the Labour Relations Act (hereinafter referred to as “the LRA”),2 every employee has the right not to be unfairly dismissed. An employment contract between an employee and employer arises out of a contract to perform services. This is so whether the contract is in writing or not. Dismissal is defined in the LRA3 as where the employer has terminated employment with or without a notice. The thesis is composed of five chapters, each of them dealing with different aspects of automatic termination clauses in employment contracts.
- Full Text:
- Date Issued: 2019
- Authors: Ndzendze, Kutala
- Date: 2019
- Subjects: Labor contract -- South Africa , Employees -- Dismissal of -- Law and legislation -- South Africa Unfair labor practices -- South Africa
- Language: English
- Type: Thesis , Masters , LLM
- Identifier: http://hdl.handle.net/10948/41808 , vital:36594
- Description: This study aims to establish Automatic Termination Clauses in Employment contracts by analyzing the provisions of the Constitution of the Republic of South Africa, Labour Relations Act and the precedents. The automatic termination of employment contract means that the contract is terminated without giving an employee the opportunity to state his or her version as per the audi alteram partem principle. In essence, the employee is deprived of his or her right to a fair dismissal as outlined in the Labour Relations Act. The automatic termination clauses in employment contract means that the employment contract will come to an end when the employee’s services are no longer required or when the employer simply does no longer want to keep the employee at work. The Constitution of the Republic of South Africa provides that “everyone has the right to fair labour practices”.1 In terms of the Labour Relations Act (hereinafter referred to as “the LRA”),2 every employee has the right not to be unfairly dismissed. An employment contract between an employee and employer arises out of a contract to perform services. This is so whether the contract is in writing or not. Dismissal is defined in the LRA3 as where the employer has terminated employment with or without a notice. The thesis is composed of five chapters, each of them dealing with different aspects of automatic termination clauses in employment contracts.
- Full Text:
- Date Issued: 2019
Avoiding business failure in south africa
- Authors: Court, Nadine viargaret
- Date: 2019
- Subjects: Business failures -- Prevention -- South Africa , Business failures Success in business Business enterprises -- Management -- South Africa Small business -- South Africa
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: http://hdl.handle.net/10948/38024 , vital:34284
- Description: The purpose of this study was to develop a comprehensive framework to forecast that a business is entering a distressed situation and to identify the warning signs to look out for before it is too late to turn the business around in order to maintain a sustainable future. The possible solution lies in what business owners and management can do, and look out for, to avoid business failure. The intended contribution of the study was to design a framework for most businesses, especially SMMEs, to follow to avoid business failure. Therefore, it can be seen from this study that it is critical for business owners and management to be innovative in their business to achieve competitive advantage and, as such, remain sustainable. Stakeholder relationships are critical to achieving a competitive advantage. Financial Analysis, Technology Management, Innovation, Organisational Design and Risk Management are interrelated and are very inter-dependent when seeking to avoid business failure. However, innovation and technology management have a significant influence on business failure and, as such, are critical to the success of the business.
- Full Text:
- Date Issued: 2019
- Authors: Court, Nadine viargaret
- Date: 2019
- Subjects: Business failures -- Prevention -- South Africa , Business failures Success in business Business enterprises -- Management -- South Africa Small business -- South Africa
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: http://hdl.handle.net/10948/38024 , vital:34284
- Description: The purpose of this study was to develop a comprehensive framework to forecast that a business is entering a distressed situation and to identify the warning signs to look out for before it is too late to turn the business around in order to maintain a sustainable future. The possible solution lies in what business owners and management can do, and look out for, to avoid business failure. The intended contribution of the study was to design a framework for most businesses, especially SMMEs, to follow to avoid business failure. Therefore, it can be seen from this study that it is critical for business owners and management to be innovative in their business to achieve competitive advantage and, as such, remain sustainable. Stakeholder relationships are critical to achieving a competitive advantage. Financial Analysis, Technology Management, Innovation, Organisational Design and Risk Management are interrelated and are very inter-dependent when seeking to avoid business failure. However, innovation and technology management have a significant influence on business failure and, as such, are critical to the success of the business.
- Full Text:
- Date Issued: 2019
Bait collecting by subsistence and recreational fishers in Knysna Estuary may impact management and conservation
- Simon, C, du Toit, A N, Smith, M K S, Claassens, Louw, Smith, F, Smith, P
- Authors: Simon, C , du Toit, A N , Smith, M K S , Claassens, Louw , Smith, F , Smith, P
- Date: 2019
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/447056 , vital:74581 , https://hdl.handle.net/10520/EJC-1d75666653
- Description: To facilitate development of tailored management strategies for bait species within Knysna Estuary (South Africa), demand for bait, harvesting activity and perceptions around conservation among recreational and subsistence bait fishers were investigated. In 2015 and 2016, bait collectors were interviewed (n = 84) and observed (n = 167) during low tides at six sites during peak and off-peak holiday periods. Significant associations among subsistence and recreational fishers and their favoured bait species, collecting spots and method, frequency of collection, views on regulations and desired daily limit for mudprawns suggest differences that may warrant different management strategies. Furthermore, observed methods and duration of bait collecting differed according to site, suggesting spatial variation in baiting pressures. Subsistence fishers potentially collect more mudprawns more frequently than do recreational fishers and consequently have a greater impact on mudprawn populations. By contrast, recreational fishers collect more polychaete worms, but because they are mainly active during holidays, their impact on these species may be localised and not yet critical. Most subsistence fishers would like increased daily bag limits, to sell bait and would welcome a rotational zonation scheme to replace the current permanent exclusion zone. The merits and disadvantages of these management options and suggestions are discussed.
- Full Text:
- Date Issued: 2019
- Authors: Simon, C , du Toit, A N , Smith, M K S , Claassens, Louw , Smith, F , Smith, P
- Date: 2019
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/447056 , vital:74581 , https://hdl.handle.net/10520/EJC-1d75666653
- Description: To facilitate development of tailored management strategies for bait species within Knysna Estuary (South Africa), demand for bait, harvesting activity and perceptions around conservation among recreational and subsistence bait fishers were investigated. In 2015 and 2016, bait collectors were interviewed (n = 84) and observed (n = 167) during low tides at six sites during peak and off-peak holiday periods. Significant associations among subsistence and recreational fishers and their favoured bait species, collecting spots and method, frequency of collection, views on regulations and desired daily limit for mudprawns suggest differences that may warrant different management strategies. Furthermore, observed methods and duration of bait collecting differed according to site, suggesting spatial variation in baiting pressures. Subsistence fishers potentially collect more mudprawns more frequently than do recreational fishers and consequently have a greater impact on mudprawn populations. By contrast, recreational fishers collect more polychaete worms, but because they are mainly active during holidays, their impact on these species may be localised and not yet critical. Most subsistence fishers would like increased daily bag limits, to sell bait and would welcome a rotational zonation scheme to replace the current permanent exclusion zone. The merits and disadvantages of these management options and suggestions are discussed.
- Full Text:
- Date Issued: 2019
Behaviour of an alpine range-restricted species is described by interactions between microsite use and temperature
- Oswald, Krista N, Smit, Ben, Lee, Alan T K, Cunningham, Susan J
- Authors: Oswald, Krista N , Smit, Ben , Lee, Alan T K , Cunningham, Susan J
- Date: 2019
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/441531 , vital:73896 , https://doi.org/10.1016/j.anbehav.2019.09.006
- Description: Climate change predictions include increased mean temperatures and increased frequency of heatwaves. Short-term responses to high air temperatures can allow animals to conserve water while maintaining a safe body temperature. For birds, cooling is often through evaporative water loss, which can be physiologically costly. Microsite use is an effective means of conserving water via reducing environmental heat load, so long as there are no negative trade-offs with other necessary functions, such as foraging. We examined behavioural responses to temperature in Cape rockjumpers, Chaetops frenatus (hereafter: ‘rockjumper’), an alpine specialist bird. We hypothesized that rockjumper behaviours would be temperature and microsite dependent. We collected data on rockjumper microsite use (sun, rock shade), behaviour (activity, foraging, preening, panting) and temperature (air, environmental). Rockjumpers made increased use of rock shade as air temperature increased. However, birds in rock shade foraged less. Depending on where their main food source is located, this suggests that when foraging demands are high, birds may need to remain in the sun despite risks of high thermal load, or else may suffer costs of lost foraging opportunities when using shade. The relationship between air temperature and heat dissipation behaviour (panting) was also mediated by microsite: birds showed significant increases in panting with increasing air temperature only when in the sun. The lack of increase in panting for birds in rock shade suggests that shade seeking may buffer physiological thermoregulatory costs (i.e. water expenditure). Individuals may therefore be able to mitigate some potential negative effects of high temperatures by making use of cooler microsites, although this could come at a cost to foraging.
- Full Text:
- Date Issued: 2019
- Authors: Oswald, Krista N , Smit, Ben , Lee, Alan T K , Cunningham, Susan J
- Date: 2019
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/441531 , vital:73896 , https://doi.org/10.1016/j.anbehav.2019.09.006
- Description: Climate change predictions include increased mean temperatures and increased frequency of heatwaves. Short-term responses to high air temperatures can allow animals to conserve water while maintaining a safe body temperature. For birds, cooling is often through evaporative water loss, which can be physiologically costly. Microsite use is an effective means of conserving water via reducing environmental heat load, so long as there are no negative trade-offs with other necessary functions, such as foraging. We examined behavioural responses to temperature in Cape rockjumpers, Chaetops frenatus (hereafter: ‘rockjumper’), an alpine specialist bird. We hypothesized that rockjumper behaviours would be temperature and microsite dependent. We collected data on rockjumper microsite use (sun, rock shade), behaviour (activity, foraging, preening, panting) and temperature (air, environmental). Rockjumpers made increased use of rock shade as air temperature increased. However, birds in rock shade foraged less. Depending on where their main food source is located, this suggests that when foraging demands are high, birds may need to remain in the sun despite risks of high thermal load, or else may suffer costs of lost foraging opportunities when using shade. The relationship between air temperature and heat dissipation behaviour (panting) was also mediated by microsite: birds showed significant increases in panting with increasing air temperature only when in the sun. The lack of increase in panting for birds in rock shade suggests that shade seeking may buffer physiological thermoregulatory costs (i.e. water expenditure). Individuals may therefore be able to mitigate some potential negative effects of high temperatures by making use of cooler microsites, although this could come at a cost to foraging.
- Full Text:
- Date Issued: 2019
Behavioural flexibility in an endangered seabird during current changes
- Authors: Traisnel, Gwendoline
- Date: 2019
- Subjects: Penguins -- South Africa , Penguins -- Behavior Sea birds -- Behavior Sea birds -- Ecology
- Language: English
- Type: Thesis , Doctoral , DPhil
- Identifier: http://hdl.handle.net/10948/43800 , vital:37048
- Description: Penguins spend a large part of their life cycle at sea and are amongst the most threatened seabirds as they suffer high mortality and have low reproductive success. Across the world, many populations are currently declining despite the constant development of conservation actions. The lack of information at the individual level reduces the understanding of individual variability and its potential role in the population dynamics of these vulnerable species. For example, long-lived species are characterised by substantial individual heterogeneity in their contribution to the overall population dynamic that should be understood when considering the implemention of conservation policies. This thesis explored some of the primary mechanisms behind inter-individual differences in behaviour and breeding success in the endangered African penguin Spheniscus demersus. On Bird island (Algoa Bay), nest defence behaviours were investigated on adults brooding chicks 1-3 weeks-old and chicks were measured at regular intervals (every 5 days) to assess their growth rate, a proxy for breeding success in this species. All adults were sexed and implanted with a passive integrated transponder which was used for individual identification. In this species, males are usually larger than females and have a higher survival rates both as juveniles and as adults. A subsample of them was equipped with tracking devices (GPSs and Time Depth Recorders), sometimes over consecutive foraging trips and across years. Finally, mate and nest fidelity were investigated to understand the drivers and consequences of this trait in that population. Breeding success was linked to nest defence behaviours, with bolder birds generally showing lower breeding success. This relation could not, however, be explained by differences in foraging strategies. Males were generally bolder than females when defending the nests, but their foraging behaviour did not vary with their personality. They generally had lower foraging effort than females. By contrast, bolder females performed more sinuous path, more wiggles and travelled larger vertical distances than shyer ones. Overall, females were more flexible than males over consecutive trips, suggesting that they probably adjust their behaviours to the offspring needs in this species. However, no sex difference in behavioural flexibility between sexes was visible across years, indicating that environmental variability may equally impact females and males’ behaviour over such time-scale. Generally, consistency was time-scale dependent as penguins increased their foraging flexibility across years, potentially adjusting to the variability of the environment. Interestingly, foraging consistency over consecutive trips increased during years of poor environmental conditions, and individuals with consistent foraging strategies were more successful than more flexible individuals when resources were extremely scarce. Finally, while nest and mate fidelity were high in this species, individuals that changed nest/partners, improved their breeding outcome. Particularly, after low breeding success females were more likely to change nest site and thereby partner to possibly improve their fitness. The potential biased adult sex ratio towards males in this population may facilitate changes in females which may have more partners available to re-mate than males. The present thesis reveals the existence of individual differences in behaviour and breeding success which relate to personality in penguins. These findings highlight the importance to integrate individual variability to predict future population dynamics in the context of global changes to understand the resilience and vulnerability of the species.
- Full Text:
- Date Issued: 2019
- Authors: Traisnel, Gwendoline
- Date: 2019
- Subjects: Penguins -- South Africa , Penguins -- Behavior Sea birds -- Behavior Sea birds -- Ecology
- Language: English
- Type: Thesis , Doctoral , DPhil
- Identifier: http://hdl.handle.net/10948/43800 , vital:37048
- Description: Penguins spend a large part of their life cycle at sea and are amongst the most threatened seabirds as they suffer high mortality and have low reproductive success. Across the world, many populations are currently declining despite the constant development of conservation actions. The lack of information at the individual level reduces the understanding of individual variability and its potential role in the population dynamics of these vulnerable species. For example, long-lived species are characterised by substantial individual heterogeneity in their contribution to the overall population dynamic that should be understood when considering the implemention of conservation policies. This thesis explored some of the primary mechanisms behind inter-individual differences in behaviour and breeding success in the endangered African penguin Spheniscus demersus. On Bird island (Algoa Bay), nest defence behaviours were investigated on adults brooding chicks 1-3 weeks-old and chicks were measured at regular intervals (every 5 days) to assess their growth rate, a proxy for breeding success in this species. All adults were sexed and implanted with a passive integrated transponder which was used for individual identification. In this species, males are usually larger than females and have a higher survival rates both as juveniles and as adults. A subsample of them was equipped with tracking devices (GPSs and Time Depth Recorders), sometimes over consecutive foraging trips and across years. Finally, mate and nest fidelity were investigated to understand the drivers and consequences of this trait in that population. Breeding success was linked to nest defence behaviours, with bolder birds generally showing lower breeding success. This relation could not, however, be explained by differences in foraging strategies. Males were generally bolder than females when defending the nests, but their foraging behaviour did not vary with their personality. They generally had lower foraging effort than females. By contrast, bolder females performed more sinuous path, more wiggles and travelled larger vertical distances than shyer ones. Overall, females were more flexible than males over consecutive trips, suggesting that they probably adjust their behaviours to the offspring needs in this species. However, no sex difference in behavioural flexibility between sexes was visible across years, indicating that environmental variability may equally impact females and males’ behaviour over such time-scale. Generally, consistency was time-scale dependent as penguins increased their foraging flexibility across years, potentially adjusting to the variability of the environment. Interestingly, foraging consistency over consecutive trips increased during years of poor environmental conditions, and individuals with consistent foraging strategies were more successful than more flexible individuals when resources were extremely scarce. Finally, while nest and mate fidelity were high in this species, individuals that changed nest/partners, improved their breeding outcome. Particularly, after low breeding success females were more likely to change nest site and thereby partner to possibly improve their fitness. The potential biased adult sex ratio towards males in this population may facilitate changes in females which may have more partners available to re-mate than males. The present thesis reveals the existence of individual differences in behaviour and breeding success which relate to personality in penguins. These findings highlight the importance to integrate individual variability to predict future population dynamics in the context of global changes to understand the resilience and vulnerability of the species.
- Full Text:
- Date Issued: 2019
Benchmarking a Decision Support System for Aquatic Toxicity Testing
- Griffin, Neil J, Odume, Oghenekaro N, Mensah, Paul K, Palmer, Carolyn G
- Authors: Griffin, Neil J , Odume, Oghenekaro N , Mensah, Paul K , Palmer, Carolyn G
- Date: 2019
- Subjects: To be catalogued
- Language: English
- Type: text , report
- Identifier: http://hdl.handle.net/10962/437798 , vital:73413 , ISBN 978-0-6392-0108-5 , https://wrcwebsite.azurewebsites.net/wp-content/uploads/mdocs/2445_final1.pdf
- Description: This book was written for the catchment management forum (CMF) in the Upper Komati Forum (UKF), and they share their experience in order to help other CMFs understand the damage coal mining does to our water resources. This booklet should be used with How to think and act in ways that make Adaptive IWRM practi-cally possible and How to establish and run a Catchment Management Forum.
- Full Text:
- Date Issued: 2019
- Authors: Griffin, Neil J , Odume, Oghenekaro N , Mensah, Paul K , Palmer, Carolyn G
- Date: 2019
- Subjects: To be catalogued
- Language: English
- Type: text , report
- Identifier: http://hdl.handle.net/10962/437798 , vital:73413 , ISBN 978-0-6392-0108-5 , https://wrcwebsite.azurewebsites.net/wp-content/uploads/mdocs/2445_final1.pdf
- Description: This book was written for the catchment management forum (CMF) in the Upper Komati Forum (UKF), and they share their experience in order to help other CMFs understand the damage coal mining does to our water resources. This booklet should be used with How to think and act in ways that make Adaptive IWRM practi-cally possible and How to establish and run a Catchment Management Forum.
- Full Text:
- Date Issued: 2019
Benefits and limitation of informal trading in promoting sustainable local economic development in the Intsika Yethu Municipality
- Authors: Makubalo, Zukiswa
- Date: 2019
- Subjects: Municipal government -- South Africa -- Eastern Cape Sustainable development -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MPA
- Identifier: http://hdl.handle.net/10353/12425 , vital:39262
- Description: The informal sector refers to all economic activities by workers and economic units that are not covered or insufficiently covered by formal arrangements which can be carried out across all the sectors of the economy both in public and private spaces. The study was conducted to determine the benefits and limitation of informal trading in promoting sustainable local economic development in the Intsika Yethu Municipality. South African municipalities for various reasons fail in providing local economic development friendly environment and more developmental and inclusive informal economy policies and by-laws. The objective of the study was to assess the benefits and challenges which might hinder the maximisation of benefits in the sector. The literature was reviewed with the aim to integrate published academic data on the benefits and limitations of informal trading in promoting sustainable local economic development. Data for the study was sourced from the literature and questionnaires administered to respondents who were selected by means of a purposive sampling technique. The respondents from which data was collected were 18 and a qualitative research approach was used as a main research methodology. The responses obtained were subjected to content analyses. The main findings of the study include; informal traders are uncoordinated, informal traders are faced with challenges which hinder their success, majority of respondents see benefits from informal trading, the informal sector of responds to triple social ills and all respondents started up businesses due to the inability of the formal sector to create job opportunities that are permanent and enough for everyone. In response to the findings about the main recommendation made is the improvement of communication between government and informal trader for the sustainability of municipal programs.
- Full Text:
- Date Issued: 2019
- Authors: Makubalo, Zukiswa
- Date: 2019
- Subjects: Municipal government -- South Africa -- Eastern Cape Sustainable development -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MPA
- Identifier: http://hdl.handle.net/10353/12425 , vital:39262
- Description: The informal sector refers to all economic activities by workers and economic units that are not covered or insufficiently covered by formal arrangements which can be carried out across all the sectors of the economy both in public and private spaces. The study was conducted to determine the benefits and limitation of informal trading in promoting sustainable local economic development in the Intsika Yethu Municipality. South African municipalities for various reasons fail in providing local economic development friendly environment and more developmental and inclusive informal economy policies and by-laws. The objective of the study was to assess the benefits and challenges which might hinder the maximisation of benefits in the sector. The literature was reviewed with the aim to integrate published academic data on the benefits and limitations of informal trading in promoting sustainable local economic development. Data for the study was sourced from the literature and questionnaires administered to respondents who were selected by means of a purposive sampling technique. The respondents from which data was collected were 18 and a qualitative research approach was used as a main research methodology. The responses obtained were subjected to content analyses. The main findings of the study include; informal traders are uncoordinated, informal traders are faced with challenges which hinder their success, majority of respondents see benefits from informal trading, the informal sector of responds to triple social ills and all respondents started up businesses due to the inability of the formal sector to create job opportunities that are permanent and enough for everyone. In response to the findings about the main recommendation made is the improvement of communication between government and informal trader for the sustainability of municipal programs.
- Full Text:
- Date Issued: 2019
Betty, Zorg and Me
- Authors: Krueger, Anton
- Date: 2019
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/225552 , vital:49234 , xlink:href="https://doi.org/10.1080/00138398.2019.1636529"
- Description: This essay reminisces about the author’s encounters with Betty Blue at three different stages in his life. It reflects on stylistic elements of the film (as exemplar of Jean-Jacques Beineix’s Cinéma du look) as well as its portrayal of gender, sexuality, artistic aspiration and the concept of freedom. The essay also ruminates on the concept of having favourites and the synchronicity required to make a magical movie.
- Full Text:
- Date Issued: 2019
- Authors: Krueger, Anton
- Date: 2019
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/225552 , vital:49234 , xlink:href="https://doi.org/10.1080/00138398.2019.1636529"
- Description: This essay reminisces about the author’s encounters with Betty Blue at three different stages in his life. It reflects on stylistic elements of the film (as exemplar of Jean-Jacques Beineix’s Cinéma du look) as well as its portrayal of gender, sexuality, artistic aspiration and the concept of freedom. The essay also ruminates on the concept of having favourites and the synchronicity required to make a magical movie.
- Full Text:
- Date Issued: 2019
Between drones and al-Shabaab: United States extra-judicial killings in Somalia, sovereignty and the future of liberal intervention
- Authors: Koloko, Mojalefa
- Date: 2019
- Subjects: Somalia -- Politics and government -- 1991- , Somalia -- History -- 1991- , Somalia -- Foreign relations -- United States , Somalia -- Foreign relations -- 1991- , Military assistance, American -- Somalia , Extrajudicial exeutions -- Somalia , Shabaab (Organization)
- Language: English
- Type: text , Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/67657 , vital:29125
- Description: This study examines the nature of the United States intervention in Somalia, specifically the use of drone strikes that first targeted the militant Sunni Islamist transnational group, al-Qaeda, which claimed responsibility for the 11 September 2001 attacks on the United States, and now target the Somali organisation, Harakat al-Shabaab al-Mujahidin, commonly known as al-Shabaab. The use of drone strikes in the US led war on terror has raised concerns about sovereignty as the extra-judicial killings are conducted without the consent of the concerned states. Furthermore, drone strikes also raise questions about the processes of liberal intervention as the US conducts them without the approval of the United Nations Security Council. It is argued in this study that what is understood to be the “golden era” of liberal interventionism is a legacy of the post-Cold War unipolar dominance of the United States in global governance and security. It is argued that US unipolarity was accompanied by a shifting perception regarding the security position of weak states, whose weakness becomes understood as a source of global insecurity. This perception that so called “weak” and “fragile” states are sources of threats is a departure in International Relations theory, because the discipline is historically preoccupied with studying the actions of powerful states and their consequence for the global order. It is argued that the discourse on the war on terror, and its focus on “failed states” as breeding grounds for alleged terrorists, represents the height of the repositioning of less powerful states from a peripheral status in IR analysis and practice, to their current position that are now being represented as core sources of threat to international peace and security. Through life history interviews with Somali nationals in Grahamstown, Port Elizabeth and Uitenhage, South Africa, the study examines the consequences of US actions from the eyes of Somali people. The findings of this study show that despite all the controversy surrounding the legitimacy of the war on terror, the manner in which it is conducted, as well as the tactics that it employs, the majority of Somali participants showed an overwhelming support for the US intervention. Participants expressed support for the US extra-judicial killings because they are understood to undermine al-Shabaab strength which is a major source of insecurity. The study also shows that the lack of necessary collaboration between the US intelligence and the Somali ground forces has resulted in high numbers of civilian deaths, which participants fear can be used by al-Shabaab to recruit and radicalise more Somalis. The study also shows that most Somalis resent the presence of the African Union Mission in Somalia because Kenya and Ethiopia are seen as 10 pursuing national interests that are not invested in Somali peace and stability. The study concludes that US extra-judicial killings have failed to constrain the actions of al-Shabaab. Somalis expressed that the leadership of current president, Mohamed Abdullahi Mohamed Farmaajo, holds the unique possibilities of creating national unity that rises above clan divisions and the radical Jihadist ideology of al-Shabaab.
- Full Text:
- Date Issued: 2019
- Authors: Koloko, Mojalefa
- Date: 2019
- Subjects: Somalia -- Politics and government -- 1991- , Somalia -- History -- 1991- , Somalia -- Foreign relations -- United States , Somalia -- Foreign relations -- 1991- , Military assistance, American -- Somalia , Extrajudicial exeutions -- Somalia , Shabaab (Organization)
- Language: English
- Type: text , Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/67657 , vital:29125
- Description: This study examines the nature of the United States intervention in Somalia, specifically the use of drone strikes that first targeted the militant Sunni Islamist transnational group, al-Qaeda, which claimed responsibility for the 11 September 2001 attacks on the United States, and now target the Somali organisation, Harakat al-Shabaab al-Mujahidin, commonly known as al-Shabaab. The use of drone strikes in the US led war on terror has raised concerns about sovereignty as the extra-judicial killings are conducted without the consent of the concerned states. Furthermore, drone strikes also raise questions about the processes of liberal intervention as the US conducts them without the approval of the United Nations Security Council. It is argued in this study that what is understood to be the “golden era” of liberal interventionism is a legacy of the post-Cold War unipolar dominance of the United States in global governance and security. It is argued that US unipolarity was accompanied by a shifting perception regarding the security position of weak states, whose weakness becomes understood as a source of global insecurity. This perception that so called “weak” and “fragile” states are sources of threats is a departure in International Relations theory, because the discipline is historically preoccupied with studying the actions of powerful states and their consequence for the global order. It is argued that the discourse on the war on terror, and its focus on “failed states” as breeding grounds for alleged terrorists, represents the height of the repositioning of less powerful states from a peripheral status in IR analysis and practice, to their current position that are now being represented as core sources of threat to international peace and security. Through life history interviews with Somali nationals in Grahamstown, Port Elizabeth and Uitenhage, South Africa, the study examines the consequences of US actions from the eyes of Somali people. The findings of this study show that despite all the controversy surrounding the legitimacy of the war on terror, the manner in which it is conducted, as well as the tactics that it employs, the majority of Somali participants showed an overwhelming support for the US intervention. Participants expressed support for the US extra-judicial killings because they are understood to undermine al-Shabaab strength which is a major source of insecurity. The study also shows that the lack of necessary collaboration between the US intelligence and the Somali ground forces has resulted in high numbers of civilian deaths, which participants fear can be used by al-Shabaab to recruit and radicalise more Somalis. The study also shows that most Somalis resent the presence of the African Union Mission in Somalia because Kenya and Ethiopia are seen as 10 pursuing national interests that are not invested in Somali peace and stability. The study concludes that US extra-judicial killings have failed to constrain the actions of al-Shabaab. Somalis expressed that the leadership of current president, Mohamed Abdullahi Mohamed Farmaajo, holds the unique possibilities of creating national unity that rises above clan divisions and the radical Jihadist ideology of al-Shabaab.
- Full Text:
- Date Issued: 2019
Beyond Pierre Hadot’s promethean and orphic framework: critical reflections on Leonardo Dicaprio’s environmental documentaries in relation to the veil of ISIS
- Authors: Kotze, Mieke
- Date: 2019
- Subjects: Philosophy of nature , Documentary films -- United States -- History and criticism Environmental films -- United States -- History and criticism Motion pictures -- United States -- History -- 21st century
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10948/40599 , vital:36186
- Description: In his book The Veil of Isis: An Essay on the History of the Idea of Nature (2006), Pierre Hadot details two opposing paradigmatic attitudes to nature that have prevailed over the ages, namely, the Promethean and Orphic approaches, which entail, respectively, the violent unmasking of nature’s secrets through technology and the gentle approximation of them through aesthetic means. However, while this dichotomy does constitute a useful tool for understanding broad attitudes toward nature, it does not allow for consideration of the more nuanced, responses to nature across the various epochs, including the contemporary context of the looming ecological crisis. For this reason in what follows, Hadot’s Promethean-Orphic binary will be extended into a more comprehensive framework that allows for the contemplation of three additional approaches to nature, namely Socratic withdrawal, Aristotelian-inspired faith in teleology and the Hippocratic pursuit of balance with nature – which Hadot sees as either displaced by or incorporated into the Promethean attitude. Thereafter, various historical epochs will be explored through the lens of this extended Hadotian framework in order to assess the manner in which the abovementioned attitudes and approaches to nature have been adopted and progressively rearticulated, from Archaic Greece to Deleuze’s control society. And it will be advanced that, while at the outset, these approaches were more or less equivalent in terms of their discursive influence, over time Prometheanism, and the rearticulated permutations of Socratic withdrawal and Aristotelian-inspired faith in teleology, have combined to constitute what is here referred to as the Promethean/Socratic/Aristotelian nexus; a nexus which, as will be discussed, has progressively eclipsed the less invasive approaches of Hippocratic balance and Orphism, to the detriment of both nature and human relations to it. The progression of such tendencies will then be examined in relation to the two contemporary environmental films associated with Leonardo DiCaprio, namely The 11th Hour (2007) and Before the Flood (2016). This will be done in order to draw into conspicuity the intensification of discourses surrounding the technological dominance of the environment by humans who have withdrawn from nature, inspired by faith in the telos of the free-market economy, along with and the attendant marginalization of balance-seeking and aesthetically-oriented approaches to nature. Furthermore, it will be advanced, in concluding that such discursive patterns could account for the widespread apathy and indifference which characterizes contemporary responses to the environmental crisis.
- Full Text:
- Date Issued: 2019
- Authors: Kotze, Mieke
- Date: 2019
- Subjects: Philosophy of nature , Documentary films -- United States -- History and criticism Environmental films -- United States -- History and criticism Motion pictures -- United States -- History -- 21st century
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10948/40599 , vital:36186
- Description: In his book The Veil of Isis: An Essay on the History of the Idea of Nature (2006), Pierre Hadot details two opposing paradigmatic attitudes to nature that have prevailed over the ages, namely, the Promethean and Orphic approaches, which entail, respectively, the violent unmasking of nature’s secrets through technology and the gentle approximation of them through aesthetic means. However, while this dichotomy does constitute a useful tool for understanding broad attitudes toward nature, it does not allow for consideration of the more nuanced, responses to nature across the various epochs, including the contemporary context of the looming ecological crisis. For this reason in what follows, Hadot’s Promethean-Orphic binary will be extended into a more comprehensive framework that allows for the contemplation of three additional approaches to nature, namely Socratic withdrawal, Aristotelian-inspired faith in teleology and the Hippocratic pursuit of balance with nature – which Hadot sees as either displaced by or incorporated into the Promethean attitude. Thereafter, various historical epochs will be explored through the lens of this extended Hadotian framework in order to assess the manner in which the abovementioned attitudes and approaches to nature have been adopted and progressively rearticulated, from Archaic Greece to Deleuze’s control society. And it will be advanced that, while at the outset, these approaches were more or less equivalent in terms of their discursive influence, over time Prometheanism, and the rearticulated permutations of Socratic withdrawal and Aristotelian-inspired faith in teleology, have combined to constitute what is here referred to as the Promethean/Socratic/Aristotelian nexus; a nexus which, as will be discussed, has progressively eclipsed the less invasive approaches of Hippocratic balance and Orphism, to the detriment of both nature and human relations to it. The progression of such tendencies will then be examined in relation to the two contemporary environmental films associated with Leonardo DiCaprio, namely The 11th Hour (2007) and Before the Flood (2016). This will be done in order to draw into conspicuity the intensification of discourses surrounding the technological dominance of the environment by humans who have withdrawn from nature, inspired by faith in the telos of the free-market economy, along with and the attendant marginalization of balance-seeking and aesthetically-oriented approaches to nature. Furthermore, it will be advanced, in concluding that such discursive patterns could account for the widespread apathy and indifference which characterizes contemporary responses to the environmental crisis.
- Full Text:
- Date Issued: 2019
Bioavailability of nutrients in a diet enriched with moringa oleifera lam. Leaves using wistar rats
- Authors: Mhlomi, Yanga Nonelela
- Date: 2019
- Subjects: Moringa Medicinal plants
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10353/14594 , vital:40018
- Description: This study investigated the nutritional composition and bioavailability of nutrients in Moringa oleifera leaf meal from South African ecotype. Nutritional evaluation (proximate, mineral, vitamins and antinutrients, amino acids and fatty acids analyses) was performed using AOAC, ICP-OES and GC+MS techniques respectively. Bioavailability of nutrients involved formulation of diets deficient in minerals and vitamins; and proteins supplemented with Moringa oleifera leaf meal (MOLM) at 0, 3, 5 and 10% respectively. Growth performance, hematological, biochemical and histopathological evaluations were used to assess the effect of MOLM supplementation. Proximate and mineral evaluation revealed that the leaves were rich in protein (28.72%) and carbohydrate (28.84%), calcium content was (1603.33 mg/100g), potassium (1690 mg/100g), zinc (13.03 mg/100g) and iron (21.13 mg/100g). Vitamin E content was the highest (89.43 mg/100g) followed by vitamic C (24.9 mg/100g) and vitamin A (12.98 mg/100g). Fatty acids analysis detected were fifteen of which polyunsaturated fatty acid linoleic acid (56.36) and alpha-linolenic acid (687.58) were highest and behenic acid (22:0) characteristics of Moringa (4.11%) were detected. Seven of the detected fatty acids were saturated fatty acids, though relatively low, with stearic acid having the highest value. On the other hand fifteen of the amino acids, 7 were essential (valine, leucine, isoleucine, methionine, threonine and phenylalanine) were detected; while alanine, proline, serine, aspartic acid, cysteine, glutamic acid, asparagine and tyrosine were non- essential amino acid. Moringa oleifera had low quantities of antinutrients in relation to minerals, thus nutrients will easily ne available. Amino and fatty acids profile of nutrient deficient diets supplemented with MOLM revealed that six essential amino acids were detected in the diets. However, the essential amino acid (EAA) in MOLM with the highest value was threonine (500.47±23.03mg/L), while the lowest was methionine (75.65±5.31mg/L). Leucine was highest in PD10 (234.32±27.98 mg/l) 15 and lowest in PD3. Predominant amino acid in VMD diet was glutamic acid (966.76±208.92 mg/l), while methionine was lowest (197.14±35.90). Caproic acid was the most prominent unsaturated fatty acid in the diets and was highest in the PD diet. Palmitoleic acid was highest in the control diet (8.19±0.56 mg/L) and lowest in PD3 but an increase was observed as the levels of MOLM increased in the diets. Linoleic acid values obtained were significantly higher in PD diet, lower in control diet, compared to other diets. Linolenic acid (C18-3n6) was higher in PD10 (63.48±3.84 mg/L) compared to the control diet (6.05±0.14 mg/L). The highest unsaturated fatty acid in all the feed samples was linoleic acids ranging from 54.48±5.61 to 296.26±7.20 mg/L. the highest omega-3 (n-3) fatty acid content (63.48±3.38 mg/L) was in PD10 and was almost 10 times higher than the value recorded for control. Rats treated on vitamin mineral deficient (VMD) diet showed no significant changes in growth performances and blood parameters except in certain indices. Rats on VMD diet had lowest haemoglobin levels, whereas haemoglobin increased with MOLM levels. No significant differences in haematocrit, MCH, MCHC, platelets, RDW and MPV were observed in all treatments and control. However, VMD rats showed decrease in haemoglobin, increase in WBC and platelets. Electrolytes and glucose for all treatments and control were not significantly different, but, control and VMD10 diets rats showed significantly higher values for creatinine compared to MOLM diets; total protein and albumin increased with MOLM and were higher than in VMD and control rats. Serum activities of liver, cardiac, adrenal marker enzymes were significantly lower in MOLM rats compared to VMD and control. Mild congestion in VMD and VMD3 rat’s liver and diffused congestion in the kidney of VMD diet fed rats was observed. Protein deficient diets supplemented with MOLM had a negative impact on feed intake and growth parameters. Rats fed PD and PD5 consumed significantly less diet than those fed PD10, PD3 diets respectively. White blood cells decreased with increasing levels of MOLM 16 supplementation. Differential white cell count (Neutrophils, lymphocytes, monocytes, eosinophils and basophils) followed the same trend though not statistically significant (P>0.05). Furthermore, histopathological evaluation of organs revealed that no abnormalities were in heart and liver and kidney of rats fed on the control diet, while mild congestion in the liver and myocardium (heart) were observed in rats fed with protein deficient diet. No visible abnormalities were observed in the heart, kidney and liver of animals on the PD 10 diet, but myocardial fibres showing intense eosinophilia was detected in heart muscles of rats fed PD and PD3 diets. In this study, MOLM had a negative impact on feed intake and growth performance of animals and haematology. Blood biochemistry and histology suggest that MOLM has the potential of defending the body against infection with hematinic and blood enhancing qualities. Protein deficiency led to a significant elevation in the serum lipid profile of rats especially cholesterol even with increase in MOLM. PD10 had the highest triglycerides content when compared to the control but was lower (p>0.05) to that of PD. There was an increase in crude fat, ADF, NDF and protein in faecal samples of rats supplemented with MOLM diets while a decrease in moisture and ash was observed compared to the control.Vitamin and mineral deficiency resulted in significant decrease in serum cholesterol, triglycerides and HDL-C when compared to the control. There was a slight increase in excretion for all elements with increasing MOLM. Total removal of minerals and vitamins from the VMD experimental diets seemed not to have any visible negative impact on performance of the rats probably because of residual micronutrients present in other ingredients used in the feed formulation. MOLM could not replace protein in protein deficient diets.
- Full Text:
- Date Issued: 2019
- Authors: Mhlomi, Yanga Nonelela
- Date: 2019
- Subjects: Moringa Medicinal plants
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10353/14594 , vital:40018
- Description: This study investigated the nutritional composition and bioavailability of nutrients in Moringa oleifera leaf meal from South African ecotype. Nutritional evaluation (proximate, mineral, vitamins and antinutrients, amino acids and fatty acids analyses) was performed using AOAC, ICP-OES and GC+MS techniques respectively. Bioavailability of nutrients involved formulation of diets deficient in minerals and vitamins; and proteins supplemented with Moringa oleifera leaf meal (MOLM) at 0, 3, 5 and 10% respectively. Growth performance, hematological, biochemical and histopathological evaluations were used to assess the effect of MOLM supplementation. Proximate and mineral evaluation revealed that the leaves were rich in protein (28.72%) and carbohydrate (28.84%), calcium content was (1603.33 mg/100g), potassium (1690 mg/100g), zinc (13.03 mg/100g) and iron (21.13 mg/100g). Vitamin E content was the highest (89.43 mg/100g) followed by vitamic C (24.9 mg/100g) and vitamin A (12.98 mg/100g). Fatty acids analysis detected were fifteen of which polyunsaturated fatty acid linoleic acid (56.36) and alpha-linolenic acid (687.58) were highest and behenic acid (22:0) characteristics of Moringa (4.11%) were detected. Seven of the detected fatty acids were saturated fatty acids, though relatively low, with stearic acid having the highest value. On the other hand fifteen of the amino acids, 7 were essential (valine, leucine, isoleucine, methionine, threonine and phenylalanine) were detected; while alanine, proline, serine, aspartic acid, cysteine, glutamic acid, asparagine and tyrosine were non- essential amino acid. Moringa oleifera had low quantities of antinutrients in relation to minerals, thus nutrients will easily ne available. Amino and fatty acids profile of nutrient deficient diets supplemented with MOLM revealed that six essential amino acids were detected in the diets. However, the essential amino acid (EAA) in MOLM with the highest value was threonine (500.47±23.03mg/L), while the lowest was methionine (75.65±5.31mg/L). Leucine was highest in PD10 (234.32±27.98 mg/l) 15 and lowest in PD3. Predominant amino acid in VMD diet was glutamic acid (966.76±208.92 mg/l), while methionine was lowest (197.14±35.90). Caproic acid was the most prominent unsaturated fatty acid in the diets and was highest in the PD diet. Palmitoleic acid was highest in the control diet (8.19±0.56 mg/L) and lowest in PD3 but an increase was observed as the levels of MOLM increased in the diets. Linoleic acid values obtained were significantly higher in PD diet, lower in control diet, compared to other diets. Linolenic acid (C18-3n6) was higher in PD10 (63.48±3.84 mg/L) compared to the control diet (6.05±0.14 mg/L). The highest unsaturated fatty acid in all the feed samples was linoleic acids ranging from 54.48±5.61 to 296.26±7.20 mg/L. the highest omega-3 (n-3) fatty acid content (63.48±3.38 mg/L) was in PD10 and was almost 10 times higher than the value recorded for control. Rats treated on vitamin mineral deficient (VMD) diet showed no significant changes in growth performances and blood parameters except in certain indices. Rats on VMD diet had lowest haemoglobin levels, whereas haemoglobin increased with MOLM levels. No significant differences in haematocrit, MCH, MCHC, platelets, RDW and MPV were observed in all treatments and control. However, VMD rats showed decrease in haemoglobin, increase in WBC and platelets. Electrolytes and glucose for all treatments and control were not significantly different, but, control and VMD10 diets rats showed significantly higher values for creatinine compared to MOLM diets; total protein and albumin increased with MOLM and were higher than in VMD and control rats. Serum activities of liver, cardiac, adrenal marker enzymes were significantly lower in MOLM rats compared to VMD and control. Mild congestion in VMD and VMD3 rat’s liver and diffused congestion in the kidney of VMD diet fed rats was observed. Protein deficient diets supplemented with MOLM had a negative impact on feed intake and growth parameters. Rats fed PD and PD5 consumed significantly less diet than those fed PD10, PD3 diets respectively. White blood cells decreased with increasing levels of MOLM 16 supplementation. Differential white cell count (Neutrophils, lymphocytes, monocytes, eosinophils and basophils) followed the same trend though not statistically significant (P>0.05). Furthermore, histopathological evaluation of organs revealed that no abnormalities were in heart and liver and kidney of rats fed on the control diet, while mild congestion in the liver and myocardium (heart) were observed in rats fed with protein deficient diet. No visible abnormalities were observed in the heart, kidney and liver of animals on the PD 10 diet, but myocardial fibres showing intense eosinophilia was detected in heart muscles of rats fed PD and PD3 diets. In this study, MOLM had a negative impact on feed intake and growth performance of animals and haematology. Blood biochemistry and histology suggest that MOLM has the potential of defending the body against infection with hematinic and blood enhancing qualities. Protein deficiency led to a significant elevation in the serum lipid profile of rats especially cholesterol even with increase in MOLM. PD10 had the highest triglycerides content when compared to the control but was lower (p>0.05) to that of PD. There was an increase in crude fat, ADF, NDF and protein in faecal samples of rats supplemented with MOLM diets while a decrease in moisture and ash was observed compared to the control.Vitamin and mineral deficiency resulted in significant decrease in serum cholesterol, triglycerides and HDL-C when compared to the control. There was a slight increase in excretion for all elements with increasing MOLM. Total removal of minerals and vitamins from the VMD experimental diets seemed not to have any visible negative impact on performance of the rats probably because of residual micronutrients present in other ingredients used in the feed formulation. MOLM could not replace protein in protein deficient diets.
- Full Text:
- Date Issued: 2019