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Financial literacy: a conceptualisation in a South African University

  • Authors: Smit, Andrew Stuart
  • Date: 2021-12
  • Subjects: Financial literacy -- South Africa , Universities and colleges -- South Africa
  • Language: English
  • Type: Master's theses , text
  • Identifier: http://hdl.handle.net/10948/54773 , vital:47660
  • Description: Financial literacy is increasingly becoming an important and relevant topic in the modern-day world. Due to the complex developments in the financial services industry such as internet banking, mobile banking and online trading, which are also becoming more accessible to consumers, financial literacy is proving to be a necessary skill to have in order to make effective financial decisions. However, in a global and local context, the financial literacy levels of individuals are generally poor. South Africa ranks poorly among other countries in terms of financial literacy levels. A study performed by the Organisation of Economic Cooperation and Development showed that South Africa finished last out of 30 countries tested in their global financial literacy survey. Financial literacy levels vary among different groups in South Africa. For example, age, gender and financial education all affect the financial literacy levels of South Africans. In South Africa, individuals aged between 18-29 display higher levels of financial literacy than individuals aged 60 and above while financial education influences the level of financial literacy for an individual because it assists an individual in making correct financial decisions. Crucially though, financial literacy among South African university students is poor. Literature reveals that South African University students struggle with personal financial management more specifically saving, spending and managing debt. Therefore, based on this, the purpose of this study is to conceptualise financial literacy within Nelson Mandela University and to gain a comprehensive understanding of the factors that affect financial literacy among the students. To achieve the purpose of this study, an in-depth literature review was conducted on the definition of financial literacy, the nature and importance of financial literacy, the dimensions of financial literacy and financial literacy in a local context. Following this was an empirical investigation into the financial literacy levels of university students through the development of a questionnaire that tested the individual’s financial knowledge, financial attitudes, financial behaviours, financial skills and financial well-being. Moreover, the relationships between the financial literacy levels of individuals and the components were tested as well. For the purposes of this study a quantitative research approach was adopted. The reason for this was it was suited to the purpose of the study which was to test the financial literacy levels of university students. This required collecting and analysing large amount of data. The sample for this study were Nelson Mandela University students who were registered for the 2020 academic year. The target sample amount was 500 students. The sampling method used was convenience sampling it was implemented through an electronic questionnaire. The number of usable questionnaires collected was 484 which resulted in an effective response rate of 96.80%. These responses were captured onto an excel spreadsheet which were then analysed through Statistica. To analyse the empirical data collected, an exploratory factor analysis, content validity, inter-observer reliability, Chronbach Alpha and ANOVA analysis were all used. The empirical analysis revealed that amongst the relationships tested, there were generally weak to no relationships between the financial literacy levels of the university students and the components of financial knowledge, financial attitudes, financial skills, financial behaviours and financial well-being. The results of the study led to a set of recommendations being developed for different stakeholders of financial literacy. These are namely, the stakeholders being the individuals, scholars, academics and the government should focus on explaining the importance of financial literacy to university students and how they can use financial literacy to improve their financial well-being. Furthermore, financial literacy programmes need to be developed to assist in improving the financial literacy levels of South African University students. There also needs to be more representative financial literacy studies performed in order to obtain a more comprehensive understanding of the financial literacy levels of South African University students. , Thesis (MCom) -- Faculty of Business and Economic Sciences, 2021
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  • Date Issued: 2021-12

Foraging ecology of Kelp Gulls in natural and anthropogenically modified environments

  • Authors: Reusch, Katharina
  • Date: 2021-12
  • Subjects: Port Elizabeth (South Africa) , Eastern Cape (South Africa) , South Africa
  • Language: English
  • Type: Doctoral theses , text
  • Identifier: http://hdl.handle.net/10948/54106 , vital:46303
  • Description: Humans are having a profound impact on the natural environment through a myriad of activities, such as land use change or direct exploitation of resources. Some species are able to adapt to these changes and thrive in deeply modified environments. They are often considered winners of global change. Among these are Kelp GullsLarus dominicanus in South Africa, which have a generalist foraging nature. Despite their abundance and potential role in the ecosystem, knowledge on their foraging ecology is limited, with no understanding of the role of natural and anthropogenic food resources during breeding. The aim of this thesis was to assess the foraging movements, diet and health of Kelp Gulls breeding in seven different colonies varying in proximity to landfills. GPS loggers were deployed on incubating adults to assess foraging trip patterns, effort, and habitats. Diet and trophic ecology of adults and chicks was determined during the breeding season by combining conventional diet analysis (i.e. stomach content samples and regurgitated pellets) with stable isotope analysis of blood plasma. Finally, population health was estimated using indices of body condition for adults and chicks, and blood and faecal parasites were examined. The first successful tracking data from Kelp Gulls in South Africa revealed that birds from all colonies spent more time foraging in natural environments (marine, coastal and terrestrial) than in anthropogenically modified ones, irrelevant of the distance to the nearest landfill, potentially reflecting prey profitability or availability around thebreeding colonies. Gulls also had higher foraging effort when foraging at sea (longer travelling distance), which might be balanced by foraging on high energy prey in themarine environment (e.g. fish). Diet and trophic ecology data confirmed the wide range of resources Kelp Gulls were capable of exploiting. Anthropogenic items were important food sources at some colonies, while annual differences in trophic level targeted were apparent at some other colonies, possibly reflecting varying predation levels on other seabirds. Diet and trophic ecology generally differed between adults and chicks, with chicks being fed a more marine, i.e. fish, and higher trophic level diet, potentially due to the higher energy content of fish being important for chick growth. Despite differences between colonies in foraging effort and diet, body condition of both adults and chicks was similar across colonies. Birds from one of the urban colonies, foraging at the local landfill, tended to have slightly higher body condition values, possibly due to the high fat content of anthropogenic items, although this was not significant. Blood parasites were very scarce, with only one genus identified, Haemoproteus spp. Parasite abundance was significantly lower in chicks than in adults, implicating that adults might get infected in areas outside the colony. Faecal smears revealed the presence of yeast cells (Candida spp.) in birds, coinciding with higher body condition values, possibly linked to foraging habitat choice, as birds might ingest yeast cells when feeding in urban areas contaminated with human excrement.Kelp Gulls breeding in South Africa forage on a wide variety of resources and habitats, with limited apparent impact on their parasite load and body condition. All colonies foraged to some extend on natural sources, although some colonies located in very urban areas seemed to depend more closely on anthropogenic items as food resource. Therefore, changes in e.g. landfill management might cause changes in population dynamics, with possible repercussions on neighbouring bird populations. Theirgeneralist foraging nature, among others, makes Kelp Gulls winners of global change and is partly responsible for their increased population numbers. As they are often perceived as pests, information on the foraging ecology is important to manage gull populations effectively. , Thesis (PhD) -- Faculty of Sciences, School of Environmental Sciences, 2021
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  • Date Issued: 2021-12

Guidelines for a job role based approach for Phishing awareness in an academic Institution

  • Authors: Mahonga,Sandisiwe
  • Date: 2021-12
  • Subjects: Identity theft -- South Africa , Computer networks --Security measures
  • Language: English
  • Type: Master's theses , text
  • Identifier: http://hdl.handle.net/10948/55855 , vital:54394
  • Description: Phishing attacks have become a perpetual threat to organisations and internet users in general. Phishing websites and emails impersonating well-known entities are launched frequently, with the intent to trick unsuspecting employees to give out sensitive information such as login details to acquire access to corporate networks. Various solutions have been developed to combat Phishing emails from reaching employees and internet users. However, security experts and Phishing attackers are in a race as Phishing attacks are also refined as solutions are developed. Thus, this raises a critical need for security awareness. Reports and Phishing studies have noted that Phishing attacks targeted towards specific job roles have been on the rise. Even though research studies and industry reports provided by organisations dedicated to information security have taken note of this phenomenon, not much guidance, recommendations or guidelines are provided on how Phishing awareness can be provided for the job roles that are most vulnerable to Phishing attacks. Therefore, the problem identified within this research is that there is a need for guidelines for a job role based approach for Phishing awareness. The primary research objective of this study, therefore, is to develop guidelines to aid towards a job role based approach for Phishing awareness. In order to meet the primary research objective, secondary research objectives were defined and met, namely; To determine the current state of Phishing trends facing organisations in relation to the job role of employees; to determine the level of Phishing awareness employees have; to identify security awareness elements from security awareness standards, best practices and frameworks; to integrate the identified security awareness elements from standards, best practices and frameworks including themes identified from the questionnaire results to formulate the proposed guidelines for a Phishing awareness approach that is relevant for the job role of employees in order to the formulate guidelines. 5 Mixed methods were used to achieve this study’s research objectives. The research methods used included a literature review which was used to define and provide an indepth discussion relating to the domain in which this study is contained, namely: Social engineering, Phishing and information security awareness and training. Furthermore, a survey which took the form of a questionnaire, was used ascertain the level of Phishing awareness amongst employees within an academic institution in South Africa. Argumentation was used to argue towards the proposed guidelines. Finally, an elite interview was conducted, in the form of a questionnaire, to evaluate the proposed guidelines. It is envisaged that the guidelines proposed for a job role Phishing awareness approach could assist organisations to equip employees in job roles that are vulnerable Phishing attacks with adequate awareness and training. , Thesis (MIT) -- Faculty of Engineering, the Built Environment and Information Technology, School of Information and Communication Technology, 2021
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  • Date Issued: 2021-12

Health promotional levy: a commercial perspective

  • Authors: Ncapayi, Sakhumzi
  • Date: 2021-12
  • Subjects: Public health -- Taxation -- South Africa , Sugar -- Taxation -- South Africa
  • Language: English
  • Type: Master's theses , text
  • Identifier: http://hdl.handle.net/10948/54213 , vital:46362
  • Description: The gazetting of the Health Promotion Levy (HPL) and its subsequent implementation had diverse effects and reactions from different stakeholders in South Africa. This study sought to understand the implications of the HPL for the industry by exploring the perceptions of SSB consumers. As such, the purpose of the study was to investigate the impact of the HPL on changing consumer preferences. The study also sought to explore the impact of the HPL on the way that companies have aligned their marketing strategies in line with the HPL to accommodate the response of the market in terms of taste and price sensitivity. An overview of the previous published work globally is analysed critically with the different sugar taxes imposed in other countries with regard to their impact on the various economies . Global discussions on the topic of the sugar tax are shared and conceptualising the sugar tax and sugar as a product. A quantitative research paradigm, also known as a positivistic research paradigm, was considered appropriate for the study that aimed to effectively test and evaluate the conceptual hypotheses and constructs that relate to the HPL. The objective was achieved by conducting an online cross-sectional survey. The survey instrument was a questionnaire that was randomly distributed to 385 SSB consumers in all nine provinces of South Africa using convenience random sampling. The data collected were analysed using the software IBM SPSS Statistics 25. The data reduction technique Exploratory Factor analysis (EFA) was then used to find the factor loadings that best produced correlations between the observed variables. The variables comprised of 5 – point Likert scale that ranged from strongly disagree (1), disagree (2), neutral (3), agree (4) to strongly agree (5). A scree plot was used for factor extraction and confirmed with parallel analysis, and four factors emerged. The factors were extracted using the oblique rotation principal – Promax with 100 iterations for convergence. Consumer perceptions in South Africa are critical to improving the implementation of the HPL and creating a healthier society. Government and management need to lead by example in promoting a healthy lifestyle through marketing activities (product promotions) and in the pricing of products, as obesity is a reality for everyone in the country and needs to be managed. , Thesis (MBA) -- Faculty of Business and Economic Sciences, 2021
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  • Date Issued: 2021-12

Ifuthe lenkolo yobuKristu kulwimi lwesiXhosa

  • Authors: Mwanda, Siyasanga Pulani
  • Date: 2021-12
  • Subjects: Port Elizabeth (South Africa) , Eastern Cape (South Africa) , South Africa
  • Language: English
  • Type: Master's theses , text
  • Identifier: http://hdl.handle.net/10948/54511 , vital:46617
  • Description: Le ngxongxo iza kuthi ithethe ngefuthe lenkolo yobuKristu kulwimi lwesiXhosa. Akuyomfihlo ukuba ulwimi luthi lukhule okanye ludodobale ngenxa yendlela abantu bolwimi abaphila ngayo notshintsho oluthi lubekho kwindlela abaphila ngayo. AmaXhosa ke athi nawo aziswa kwinkolo yobuKristu. Le ngxoxo iza kuthi icacise ngokuthe gca ithiyori yeSimiyotiki esisiseko sesi sifundo, idakance iizimvo zeengcali zeSimiyotiki, ize ke iveze amagama amatsha ayengekho esiXhoseni mhla mnene, intsusa yalamagama nentsingiselo yawo. Okwesibini izakuthi ivelele intsingiselo yemiqondiso neempawu zobuKristu negalelo lazo kulwimi lwesiXhosa. Okokugqibela iza kuthi iveze izaci namaqhalo esiXhosa angobuKristu. , Thesis (MA) -- Faculty of Humanities, School of Language, Media and Communication, 2021
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  • Date Issued: 2021-12

Igalelo lokutshintsha-tshintsha ulwimi xa kufundiswa isiXhosa kwigumbi lokufundela kwibanga le-12

  • Authors: Mini, Nolwandle
  • Date: 2021-12
  • Subjects: Port Elizabeth (South Africa) , Eastern Cape (South Africa) , South Africa
  • Language: English
  • Type: Master's theses , text
  • Identifier: http://hdl.handle.net/10948/54506 , vital:46619
  • Description: Olu phando luza kugxila kwigalelo lokutshintsha kolwimi xa kufundiswa isiXhosa kwizikolo ezifundisa isiXhosa kulwimi olongezelweyo. Lo msebenzi wolu phando usekeleze kwigalelo lokutshintshwa tshintshwa kolwimi xa kufundiswa isiXhosa kwigumbi lokufundela. Olu phando luza Kubeka iliso elibanzi kwindlela ekuhlolwa ngalo ulwimi olongezelweleyo kunye nengxelo yeziphumo zokuphela konyaka wama – 2016 nowama- 2017. Abavavanyi kwingxelo zovavanya zovavanyo bayibeke elubala into yokungaphumeleli kwabafundi ngenxa yefuthe lokungawuvi umbuzo. , Thesis (MA) -- Faculty of Humanities, School of Language, Media and Communication, 2021
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  • Date Issued: 2021-12

In-vitroevaluation of bridelia ferruginea extract gold nanoparticles for the treatment of colon cancer

  • Authors: Zosela, Itumeleng , Davids, Hajierah
  • Date: 2021-12
  • Subjects: Port Elizabeth (South Africa) , Eastern Cape (South Africa) , South Africa
  • Language: English
  • Type: Master's theses , text
  • Identifier: http://hdl.handle.net/10948/54124 , vital:46311
  • Description: Colorectal cancer (CRC) has become a health burden, being the third common cancer worldwide. Treatment of colorectal cancer is very important to manage the high prevalence rate of this disease. The available treatments for CRC have their drawbacks and side effects. Available treatments of colon cancer include surgery, chemotherapy, and radiation. Due to the side effects associated with these treatments, alternative treatments that pose less side effects are being developed worldwide. Nanotechnologies have gained global consideration due to their potential to improve the current standards and techniques for the diagnosis and treatment. The use of plants for synthesis of gold nanoparticles has opened a new venture of synthesizing environmentally friendly and cost-effective nanoparticles which possess great properties for CRC treatment. The aim of this study was to investigate the use of green synthesized AuNPs from Bridelia ferruginea for potential cancer treatment. In this work study gold nanoparticles were synthesized utilizing Bridelia ferruginea stem bark extract. The nanoparticles were characterized using UV–Vis spectroscopy, Dynamic Light Scattering (DLS), Fourier Transform Infrared Spectroscopy (FTIR) and High-Resolution Transmission Electron Microscopy (HRTEM). The in vitroanti cancer activity of the AuNPs was investigated using Presto Blue assay, cellular morphology, caspase 3/7 assay on the human colon cancer cell line at different times to assess the optimum time for cell death. The cellular uptake and localization of AuNPs was investigated using HRTEM to assess uptake and location of the AuNPs within the cell. Results obtained from this study showed that the AuNP synthesis from Bridellia ferrugenia was successful. The Presto Blue cell viability results showed that the AuNPs reduced cell viability (%) significantly (p<0.05) after 24 h. The optimum treatment time of HT-29 cells with AuNPs was determined to be 24 h. The apoptotic effects of the AuNPs were assessed using Cell Event reagent, and the results from this assay indicated that caspase 3/7 was activated with treatment with AuNPs which induced cell death via apoptosis. The HRTEM results indicated that there was no uptake of AuNP targeting in HT-29 therefore localization could not be determined. It can be concluded that the AuNPs synthesized from Bridellia ferrugenia have anti-cancer properties and are able to induce cell death through apoptosis. Furthermore, this study revealed that optimization of the AuNPs for cellular uptake is needed to further understand the interaction between the nanoparticles and the cells. This will provide more insight on how cellular death is induced by the nanoparticles. , Thesis (MSc) -- Faculty of Science, Department of Biochemistry and Microbiology (including Physiology), 2021
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  • Date Issued: 2021-12

Inbound tourist experience in south africa

  • Authors: Twumasi, Gabriel Kwadwo
  • Date: 2021-12
  • Subjects: Tourism -- Economic aspects -- South Africa
  • Language: English
  • Type: Doctoral theses , text
  • Identifier: http://hdl.handle.net/10948/54641 , vital:46877
  • Description: The tourism industry contributes significantly to the economic growth of South Africa. Although international tourism is noted for a great contribution to customer experience beyond their borders, few studies exist in respect of tourist experience in South Africa. An individual experience to a tourism destination impact on his/her satisfaction and behavioural intentions. Tourist experience has been identified as a possible strategy for building and improving the relationship between tourism businesses and their clients in order to improve customer retention and recommending and revisiting of destination. Thus, the primary objective of this study was to identify, investigate and empirically test the factors influencing customer (inbound tourists) experience in South Africa. The study also seeks to determine how these experiences influence customer satisfaction, recommendation of the destination and the likelihood of a return visit. Tourist experience is of performance value to tourism businesses as these businesses need to identify the factors they should focus on to increase the value of products and services they are delivering to their customers. A quantitative methodology was chosen for this study and data was collected through a self-administered questionnaire. The study population included all inbound tourist who had visited South Africa between the years 2018 and 2020. The research design consisted of causal and descriptive research. The study followed a quantitative research method to obtain the set objectives of the study. A measuring instrument in the form of a structured questionnaire was designed from secondary sources to source for the needed data. A web-based online questionnaire and convenience sampling technique was chosen to identify inbound tourist to South Africa. Of the 320 inbound tourists to South Africa reached and completed the questionnaire, 319 were included in the analysis. Both descriptive and inferential statistics were employed in the data analysis. The main empirical results of the study found that statistically significant relationships exist between the independent variables: Quality accommodation, Tidiness of attractions, Ancillary services, Safety of destination, Convenience retention, Quality of attractions, Transport and the dependent variables, Customer satisfaction and Recommending and revisiting of destination. The outcome of the results of the structural equation modelling revealed an acceptable model fit of the study. The results suggest that customer satisfaction, recommending and revisiting of destination are of strategic importance in promoting tourism destinations for inbound tourists. It is imperative to provide memorable experiences to tourist. Tourism destinations must always provide an excellent service in order to enhance efficient competitive services to their customers. Furthermore, it is recommended that tourism business provide products and services that will cater for the needs of inbound tourists based on the specific factors influencing customer satisfaction and the recommendation and revisiting of destinations. This study makes a significant contribution to the body of knowledge and practitioners as it has established the factors influencing inbound tourists’ experience and, how these factors influence customer satisfaction, recommending and revisiting of international tourists to South Africa. Furthermore, the study presents recommendations and practical strategies that could help tourism businesses improve inbound tourists’ experiences in South Africa. , Thesis (PhD) -- Faculty of Business and Economic Sciences, 2021
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  • Date Issued: 2021-12

Inflation, credit markets and economic growth: the case of BRICS Countries

  • Authors: Barayi, Bavuyile
  • Date: 2021-12
  • Subjects: Economic development -- BRIC countries , Inflation (Finance) -- BRIC countries
  • Language: English
  • Type: Master's theses , text
  • Identifier: http://hdl.handle.net/10948/53700 , vital:45714
  • Description: The empirical study investigates the relationship between inflation, credit markets and economic growth in the context of Brazil, Russia, India, China and South Africa (BRICS) countries. The BRICS group consists of five emerging market economies and was first coined by Jim O’Neil of Goldman Sachs in 2001 whereby initially the bloc consisted of only Brazil, Russia, India, China, South Africa joined the BRICS group in 2010. The BRICS bloc was deemed to be the top fast-growing economies that showed great potential for growth. Consequent to the 2008 global financial crisis, there has been a large change in economic thinking as policy-makers have struggled to overcome the economic misfortunes caused by the crisis. Amongst the emerging countries, the BRICS countries have in effect, established a New Development Bank to play the role of the credit facilitator the BRICS countries and other emerging countries as well. This BRICS New Development Bank was established in 2014 and already has identified and funded some projects within the BRICS countries. Moreover, the main objective of this bank is to provide credit to be utilised for infrastructure, climate change measures, as well as to ensure sustainable development. Against this backdrop, the current study investigates the role played by credit and the extent of development in credit markets on enhancing growth in the BRICS countries, particularly looking at the levels of inflation that are conducive to credit market development. The study notes that in order for credit expansion to be successful, the credit received by a country must reflect positively on a country’s economic growth. In other words, with more credit coming into a country, the expected result is that there will also be a rise in economic growth. Furthermore, seeing that inflation erodes the value of money, this credit or these funds that a country receives may not have the expected influence on growth. Therefore, the study finds it imperative to investigate the levels at which inflation allows for credit expansion to promote growth in a country. Furthermore, central banks play an important role in credit markets via the interest rate channel and the study examines the role of monetary policy in credit markets of each of the BRICS countries by looking at the inflation targeting regime as well as the absence thereof within these countries. Moreover, BRICS central banks share more or less the same goal of maintaining price stability and low inflation through various monetary policy tools. Therefore, achieving this objective will allow a central bank to gain both investor and consumer confidence which plays a role in a country’s investment rates. Moreover, inflation that is not controlled results in uncertainty which makes investors hesitant and unwilling to embark on investments. Ha, Ivanova, Ohnsorge and Unsal (2019) associate a developed financial sector with low inflation, stating that stable inflation rates eliminate uncertainty and avoids the erosion of the value of money. The current study used an Autoregressive Distributed Lag (ARDL) model to examine the linear co-integration and Non-linear Autoregressive Distributed Lag (NARDL) for the non-linear empirical analysis of the relationship between inflation, credit markets and economic growth in BRICS countries. The non-linearity of this relationship is important to study as there has been many debates on the nature of the inflation-growth relationships with some studies implying that it is positive, some say it is a negative relationship and some say it is non-linear. The annual data time series is extracted from the World Bank Indicators and the Penn State database covering the period 1960-2019. The main variables used in the study are Inflation (CPI), Credit (Domestic Credit to Private Sector) and Economic growth (GDP). The study conducted various regressions including the total of five linear regressions which were run individually for each country, the non-linear regressions consisted of three regressions for each country which were on 1) Only Inflation partitioned, (2) Only Credit partitioned and (3) both Inflation and Credit were partitioned. The partitioning of the variables is made possible by the NARDL model which allows variables to be partially decomposed into negative and positive sums to identify thresholds of variables which have various effects on other variables. The overall findings of the study suggest that although inflation exerts various effects on growth, according to this study’s results, it does not have a significant impact on credit for all the countries except for China whereby credit in general is conducive to economic growth and Brazil where growth is enhanced when credit is declining. The study revealed that generally, inflation exerts a negative impact on growth, therefore, authorities must focus on keeping inflation rates low particularly for Russia, India and South Africa as Brazil’s results suggest that rising inflation is conducive to its economic growth in the long run. According to the findings of this study, credit does not have the significant impact on growth even under different inflation thresholds. Furthermore, this does not imply that the credit channel is a futile tool for authorities, the relationship between inflation, credit and growth particularly with the hypothesis that inflation enhances credit market development and therefore growth, is not significant. , Thesis (MCom) -- Faculty of Business and Economic Sciences, School of Economics, Development & Tourism, 2021
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  • Date Issued: 2021-12

Inflation, exchange rate and unemployment nexuses in South Africa: lessons from the Inflation Targeting Framework

  • Authors: Taderera, Christie Simbarashe
  • Date: 2021-12
  • Subjects: Foreign exchange rates -- South Africa , Inflation (Finance) -- South Africa , South Africa
  • Language: English
  • Type: Master's theses , text
  • Identifier: http://hdl.handle.net/10948/54752 , vital:47656
  • Description: Unemployment, inflation and exchange rate are key macroeconomic indicators and determinants of the development of a nation, but their relationship remain ambiguous. From the last quarter of 1994 to the same period in 2019, unemployment in South Africa increased from 20 percent to 29.1 percent while over the same period, inflation fell from 15 percent to 4.5 percent. Exchange rate at the same time has increased from 3.55Rand: 1USD to 14.45Rand: 1USD (World Bank Data, 2020). With the adoption of inflation targeting framework as a way of stabilising the general price level which has a trickle effect on unemployment, South Africa has a relatively high unemployment rate of 29.1 percent. This study investigates the relationship between unemployment, inflation and exchange rate in South Africa from 2009 Quarter 1 to 2020 Quarter 1. Furthermore, the study examines the relationship between employment, inflation and exchange rate from 1970 to 2019. Lastly the study investigates the inflation threshold from 1970 to 2019. The study employs the Autoregressive Distributed Lag (ARDL) model and shows that there is no short run and long run relationship between unemployment, inflation and exchange rate. There was however a short run and long run relationship between employment, inflation, exchange rate. In a long run analysis, there is a positive relationship between employment and economic growth for both in the short run and long run. Using the conditional least squares method, an inflation threshold of 5% was found to maximise employment in South Africa vindicating the inflation target of 3-5 percent. Based on the findings of this study, it is recommended that policy measures that increase government expenditure and economic growth be made. Thus, policy makers should increase government expenditure, either by running budget deficits or by collecting more revenue to finance its expenditures so as to increase employment or decrease unemployment without incurring the risk of crowding out. Additionally, from the inflation threshold examination, the current interest rate manipulation by raising or lowering the rate must be used to ensure inflation is kept below 5 per cent. , Thesis (MCom) -- Faculty of Business and Economic Sciences, 2021
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  • Date Issued: 2021-12

Integration of clinical legal education with procedural law modules

  • Authors: Welgemoed, Marc
  • Date: 2021-12
  • Subjects: Law -- Study and teaching (Clinical education) , Procedure law
  • Language: English
  • Type: Doctoral theses , Thesis
  • Identifier: http://hdl.handle.net/10948/56123 , vital:55571
  • Description: This research evaluates the role that Clinical Legal Education (CLE) can and should play in the teaching and learning of procedural law modules, ie Civil Procedure, Criminal Procedure and the Law of Evidence. It is argued that the doctrine of transformative constitutionalism provides a sound theoretical basis for the integration of CLE in the teaching and learning of procedural law modules in that there is a constitutional imperative on law schools to train law graduates, who are ready for entry into legal practice, as far as adequate theoretical knowledge and practical skills are concerned. This research provides an indication of how the integration of CLE with procedural law modules can improve the appreciation of the values of the Constitution of the Republic of South Africa 108 of 1996 by law graduates. Graduates will learn the importance of advancing social and procedural justice when rendering legal services to members of the public. Furthermore, graduates will be equipped with valuable graduate attributes required for legal practice. The conclusion of this research is that an integrated teaching and learning methodology, in relation to procedural law modules, will result in producing better law graduates for legal practice. The result of this will be that future legal practitioners, who can serve the public in a professional, ethical and accountable manner as envisaged by the Legal Practice Act 28 of 2014, immediately after graduating from law schools, will be produced. , Thesis (LLD) -- Faculty of Law, 2021
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  • Date Issued: 2021-12

Investigating the consumer decision-making process and determinants of choice for prepaid services from mobile network service providers

  • Authors: Ajayi, Ella
  • Date: 2021-12
  • Subjects: Mobile communication systems , Consumer behavior
  • Language: English
  • Type: Master's theses , text
  • Identifier: http://hdl.handle.net/10948/53688 , vital:45713
  • Description: The mobile telecommunications industry has been a fundamental and an important enabler in the advancement of the South African economy, with mobile network providers investing billions of rands in mobile infrastructure and facilitating a functional and progressive global marketplace (ICASA Annual Performance Plan, 2020/21). South Africa’s telecommunications system is one of the most sophisticated in the emerging markets, and according to Gillwald, Mothobi, and Rademan (2018, p.6), various indices including the ICT Development Index corroborate this view. The deployment of wireless communications networks in the country has had immeasurable social benefits for many consumers. The most rural areas of the country are now able to experience the convenience and ubiquity that comes with having access to mobile network technology. Though mobile network provision is making progress in terms of bridging the digital divide, inhibitors exist within the mobile competitive landscape that prevent consumers from exploring the full benefits of the advanced technologies at their disposal. According to Chinembiri (2020, p.6), mobile data costs remain high and out of reach for the average South African consumer, despite the recent requisite data price reduction by the dominant mobile network service providers. The prepaid segment is dominated by customers who either carry multiple SIM cards or switch between mobile network operators. The adoption by ICASA of the Mobile Number Portability (MNP), the process through which customers switch between mobile operators and keep their mobile number (Yadav, Dabhade, & Dabhade, 2013, p.1), resulted in significant reduction in switching costs thus perpetuating the migration of subscribers between mobile network providers. According to Olufemi and Strydom (2018, p. 52), the fiercest competition experienced by South African mobile providers is in the prepaid market. , Thesis (MBA) -- Faculty of Business and Economic Sciences, Business School, 2021
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  • Date Issued: 2021-12

Mangrove response to water level changes at the Nxaxo-Ngqusi and St Lucia Estuaries

  • Authors: Julie, Corianna Lauren
  • Date: 2021-12
  • Subjects: Port Elizabeth (South Africa) , Eastern Cape (South Africa) , South Africa
  • Language: English
  • Type: Master's theses , text
  • Identifier: http://hdl.handle.net/10948/53644 , vital:45689
  • Description: Water level variability within an estuary can vary as a function of tides (inundation frequency and duration) and rainfall, acting as one of the main determinants of mangrove growth, diversity, productivity, and distribution. Understanding how mangroves respond in estuaries to water level variability provides baseline information which can be used to predict future changes in mangrove growth and distribution in response to this driver This study measured mangrove characteristics (growth, structure, and areal extent) in two estuaries that differed in tidal setting, and thus water variability; the Nxaxo-Ngqusi and St Lucia estuaries, South Africa. These estuaries are part of a long-term monitoring programme (2010 - 2020) that has recorded mangrove responses to environmental changes. At the Nxaxo-Ngqusi Estuary, long-tem sea-level data (2003 – 2018) collected from the nearest tide gauge, and mangrove growth and areal extent were used to assess mangrove characteristics in a permanently open, micro tidal setting.Additionally, short-term water level data (August 2019 – September 2020), measured with in situ loggers, and sediment input at different sites within the mangrove forest, were also measured. Data was collected along the main channel sites, and at previously set up cattle exclusion plots ( browsed and non-browsed sites set to establish the effect of cattle browsing on mangroves). Similarly, at the St Lucia Estuary, long term water level data (2004 – 2020) collected at the bridge in the lower reaches of the estuary by Ezemvelo KZN-Wildlife, and annual mangrove growth, structure and areal extent data were used to assess mangrove characteristics in an estuarine lake that undergoes cycles between hypersaline and freshwater-dominated states. The results showed that mangrove responses to water level changes are complex and depend on several factors such as estuary mouth dynamics, anthropogenic activities, and site-level environmental conditions. The first objective was to compare water level changes and mangrove structure (mangrove height, and pneumatophore characteristics such as height, density and % aerenchyma) and sediment input between different sites at each estuary. Mangrove growth was higher at sites where longer inundation and higher inundation frequency were recorded at the Nxaxo-Ngqusi Estuary. However,longer inundation periods under closed mouth conditions resulted in stunted growth and mangrove dieback at St Lucia Estuary. At the Nxaxo-Ngqusi Estuary, mangroves at the main channel sites, closer to the water’s edge, had an overall higher growth rate (2.8 – 45.9 cm yr-1) than the mangroves found at the browsed (0 – 25 cm yr-1) and non-browsed sites (0 – 25.3 cm yr-1) on the landward edge of the forest. The effect of cattle browsing at these sites forms part of a long-term monitoring programme and this disturbance could have also influenced the results. Mangrove growth rate was higher in years with more rainfall at all sites within the estuary. At the St Lucia Estuary, mangrove growth rate was highest (0.81 cm yr-1) at a lower mean water level range (0.13 – 1.72 m) between 2010 - 2015, and growth rate was lowest (1.3 cm yr-1) in higher mean water level range conditions (0.34 m – 2.18 m) between 2015 – 2020. When water levels increased by up to 1.1 m due to closed mouth conditions, this led to extensive mangrove dieback further upstream by 2015. The maximum tidal flooding depth and inundation period influenced pneumatophore structure (height, density, and % aerenchyma) at the Nxaxo-Ngqusi Estuary. Sediment accumulation was highest at sites with increased pneumatophore density, but accumulation rates at the Nxaxo-Ngqusi Estuary (0.4 – 0.7 g over a high tide lasting 4-5 hours) were low and did not lead to smothering of the pneumatophores. Total sediment accumulation was highest at sites that experienced greater flooding depths. Increased inundation at the St Lucia Estuary caused inundation stress which led to mangrove mortality. This is because these mangroves are found in a closed estuary where increased water levels lead to prolonged submergence of the pneumatophores. A decrease in mangrove area was recorded at both sites. Low rainfall coupled with cattle browsing caused a decrease in mangrove area of 22% between 2009 and 2019, particularly along the mangrove fringe area at the Nxaxo-Ngqusi Estuary. The mangroves at the St Lucia Estuary, however, experienced mangrove dieback at all sites, with Site 1 recording the greatest percentage decrease in area of 71.7 % (loss of 44.76 ha) between 2010 and 2020. This was related to the progressive increase of freshwater input and water level at St Lucia Estuary under closed mouth conditions. The years leading up to 2019 had peaks in water levels at the St Lucia Estuary, with the highest water level of 2.12 m in 2019 since 2002. As a consequence, there was increased reed growth, where reeds expanded by 58% (177 ha) due to the high influx of freshwater, and no tidal exchange, which occurred in conjunction with a loss of 60.% (42 ha) of the original mangrove extent at the St Lucia Estuary. This study shows that increased water level changes (inundation frequency and duration) at the Nxaxo-Ngqusi Estuary maintain healthy mangrove stands. This is in contrast to the St Lucia Estuary, where there was a loss of mangroves as a result of high water levels under closed mouth conditions. Mangrove growth and extent at the Nxaxo-Ngqusi Estuary fluctuated in response to drought, and trampling and browsing by livestock. Extensive inundation and lack of tidal exchange reduced mangrove growth and extent at the St Lucia Estuary, with mangrove dieback occurring at all sites. These two systems are representative of the dynamic conditions found in South African estuaries. These research findings suggest that the continuous effects of climate change on estuarine habitats could result in changes in estuary mouth dynamics, which could impact mangrove growth, structure, and extent. , Thesis (MSc) -- Faculty of Science, School of Environmental Sciences, 2021
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  • Date Issued: 2021-12

Mapping the importance of public participation in the expropriation of land without compensation bill: a case of Silver Town in KwaZakhele, Port Elizabeth

  • Authors: Ngwabeni, Siyasanga
  • Date: 2021-12
  • Subjects: Port Elizabeth (South Africa) , Eastern Cape (South Africa) , South Africa
  • Language: English
  • Type: Master's theses , text
  • Identifier: http://hdl.handle.net/10948/54541 , vital:46686
  • Description: The post-1994 era in the South African public imagination was envisaged to herald widespread and transformative efforts to reverse the gross injustices and human rights violations inflicted over many decades of apartheid and colonialism. One of the key measures initiated by the democratic government to drive this nation building project was the land reform programme. The ‘land question’, which is a popular tagline in South Africa when reference is made to land reform, has come to define the general discourse of socioeconomic disadvantage and change in the post-apartheid and post-colonial period – similarly to other former settler colonies in the African continent and the broader Global South. For South Africa though, this specific issue has been characterised by numerous challenges and failures largely at the level of the state, wherein a significant lack of public engagement, public participation and democratic redistribution was not being done according to ‘the will of the people’. On a number of occasions, the South African state has gone on a ‘solo crusade’ to implement the land reform programme under complex conditions that are largely unfavoured by ordinary people ‘on the ground’ – especially those who were the primary victims of land dispossession under colonialism and apartheid. As a result, over the past few years, indigenous black communities across the country especially in (semi)urban and township areas have voluntarily ‘occupied’ land at their own will and sometimes ‘illegally’, as a way to take up settlement space and determine their lives on the land of their birth. Beyond the public discourse of ‘land invasions’ and ‘failed land reform projects’, this study was conducted to closely understand the extent to which public engagement and participation has been integral in the systematic mechanism(s) to transform the patterns of land ownership and control in the democratic South Africa. To do this, the site of KwaZakhele, Silvertown, in Port Elizabeth was selected to conduct the study. This township is an outcome of apartheid geography and land dispossession where many generations of indigenous black people were displaced. Today, it is a struggling community characterised by high rates of poverty and unemployment – and one of its unresolved socio-political issues is the question of the skewed patterns of land ownership in the area. Methodologically, qualitative semi-structured interviews were utilised to conduct the study and the Marxist Concept of Citizenship was selected as a theoretical framework for the study by the researcher. The study has found that, amongst the general legislative and political shortfalls of public participation breakdown, there are other deep seated structural socioeconomic issues that are at the root of the problem – such as economic inequalities and very low prospects of social mobility – which collectively reproduce the persistent inadequacies of political instability and social unrest in the area. The study recommends an astute combination of ‘bottom-up’ active citizenship and major socioeconomic transformation in the area as a systematic and structural mechanism to empower the community of Silvertown to be the champion of its own liberation struggle for the freedom of its people to own land and democratically participate in their own governance, self-determination, and prosperity. , Thesis (MA) -- Faculty of Humanities, School of Governmental and Social Sciences, 2021
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  • Date Issued: 2021-12

Marine Plastic Pollution

  • Authors: Vilakazi, Bathobile Thandazile Unittah
  • Date: 2021-12
  • Subjects: Waste minimization --Law and legislation -- South Africa , Plastic marine debris , South Africa
  • Language: English
  • Type: Master's theses , text
  • Identifier: http://hdl.handle.net/10948/55605 , vital:53364
  • Description: Human activities can alter the ordinary operation of Earth-system processes in such a way that it escalates risks in societies across the globe. One of the more visible human activities is the production, consumption and disposal of plastic items and/or materials, the consequences of which are borne by marine life. The dissertation is founded on the premise that conservation of the marine environment must be a priority for all States. States must take responsibility for the prevention of pollution of the marine environment and further take accountability where activities within their territory are causing pollution of the marine environment through the enforcement of legislative measures. The dissertation is drafted in a manner that aims to ultimately deduce whether the current pollution laws in South Africa adequately address marine plastic pollution (MPP). As such, Chapter Two relies on the regulatory position of MPP at the international level. Various legal instruments relating to marine pollution are expounded on such as the LOSC, MARPOL, London Convention and other regional instruments relating particularly to the African continent. The chapter aims to detail the most relevant global instruments that South Africa is a party to and which promote and mandate States parties to protect the marine environment through the implementation and enforcement of regulatory measures. The global measures either exclusively address MPP or provide general provisions for marine environment protection. Chapter Three and Four of the dissertation provide a critical analysis of the legal measures adopted at the national, provincial and local levels respectively to control, reduce and prevent pollution, including MPP. The Constitution of the Republic of South Africa, 1996 requires the national, provincial and local levels of government to co-operate with each other to provide ―effective, efficient, transparent, accountable and coherent governance‖. Therefore, it is essential for this study to investigate the regulation of MPP at all levels of government particularly when the programmes of the national and provincial government must be implemented by local government. The regulatory measures at these levels of government promote the protection of the environment and further prohibit the illegal dumping of waste and littering. They also encourage communities to reduce, re-use and recycle waste. Additionally, the national government further commits itself to adopting regulations to x plastic carrier bags and plastic flat bags. These regulations will urge the plastic industry to produce recyclable plastic bags which will further encourage consumers to recycle and therefore, decrease the entry of plastic into the marine environment. The conclusion in Chapter Five is inferred from Chapter One to Chapter Four of the dissertation. Several shortcomings were observed in the regulatory measures discussed in Chapter Three and Chapter Four, most of which relate to a legal framework weakened by a lack of knowledge on MPP and therefore, an inability to firstly develop measures that expressly deal with the issue, or secondly, develop comprehensive legislative measures that address various types of marine pollution. It is therefore submitted that although South Africa‘s pollution laws in general are exceptional and do address marine pollution, they fail to address MPP sufficiently. As such, Chapter Five presents several policy recommendations in reaction to the findings. , Thesis (LLM) -- Faculty of Law , Public Law, 2021
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  • Date Issued: 2021-12

Microstructural characterization of Swift Heavy Ion (SHI) induced rotation in single crystal NiO

  • Authors: Douglas-Henry, Danielle
  • Date: 2021-12
  • Subjects: Port Elizabeth (South Africa) , Eastern Cape (South Africa) , South Africa
  • Language: English
  • Type: Doctoral theses , text
  • Identifier: http://hdl.handle.net/10948/53648 , vital:45685
  • Description: Swift Heavy Ions (SHI) are characterised by having energies greater than 1 MeV per nucleon with an atomic mass greater than 6 amu. Exposure to irradiation of this type has been known to produce latent tracks in insulators. This is due to the energy loss through the material being governed by electronic excitation processes. The extent of the track formation and microstructural changes induced has been reported to be material specific. Models such as the thermal spike model have been used to explain these changes, however rough approximations are still made. A particularly under studied phenomena is the collective rotation seen in materials exposed to off-normal incidence irradiation. To date the only available experimental data is X-Ray Diffraction (XRD) spectra and surface shifts. This does not allow for depth-dependent rotation studies and very little can be deduced regarding the microstructure of the modified volume. In this study, the microstructural changes in single crystal Nickel Oxide (NiO) have been studied using electron microscopy techniques. A depth dependent investigation of the crystal rotation was performed using Selected Area Electron Diffraction (SAED), Transmission Kikuchi Diffraction (TKD) and Electron Backscatter Diffraction (EBSD). Transmission Electron Microscopy (TEM) and Scanning Transmission Electron Microscopy (STEM) were utilized to interrogate the microstructural changes facilitating the bulk rotation. Five different NiO specimens were investigated. Specimens had surfaces parallel to either the {0 0 1} or {1 1 1} planes. Ion energies used were 593 MeV, 940 MeV and 1.6 GeV, while fluences ranged from 1.0 x 1011 ions/cm² to 9.6 x 1014 ions/cm². Latent track formation in both low fluence (nonoverlapping regime) and high fluence (overlapping regime) specimens were investigated and compared. , Thesis (PhD) -- Faculty of Science, School of Computer Science, Mathematics, Physics and Statistics, 2021
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  • Date Issued: 2021-12

Modelling African swine fever disease in domestic pigs with culling and removal of contaminated feeds

  • Authors: Ndivhuwo, Netshamutshedzi
  • Date: 2021-12
  • Subjects: African swine fever virus , domestic pigs-- South Africa
  • Language: English
  • Type: Master's theses , text
  • Identifier: http://hdl.handle.net/10948/55822 , vital:53895
  • Description: In this study, a modelling African Swine Fever disease in domestic pigs with culling of infected pigs and removal of contaminated Feeds is studied. The goal of the study is to examine if culling of infected pigs and removal of contaminated food or water on pig farms can reduce the ASF trans mission in the domestic pig population. The SEAI-B model without control strategies is studied and analysed. It is shown that the solution for the system of model equations is both bounded and positive. We have found the disease free equilibrium point, basic reproductive number (using next generation method), local stability of disease free equilibrium (using Routh-Hurwitz criterion), global stability of disease free equilibrium, endemic equilibrium point (mathematica), existence of endemic equilibrium point, local stability of endemic equilibrium point (row echelon expression with the help of Maple 2.8) and global stability of endemic equilibrium point (Lyapunov function). Furthermore, sensitivity analysis is performed on the key parameters driving ASF Virus and to de termine their relative importance and potential impact on the dynamics of ASF Virus. Numerical result shows that if we increase the contact rate between susceptible pigs and infected pigs will re sults in increase ASF disease in the population. The SEAI-B model is reformulated incorporating culling of infected pigs and removal of contaminated food or water and analysed. Firstly, we found the disease free equilibrium point, basic reproductive number (using next generation method), local stability of disease free equilibrium point, global stability of disease free equilibrium point, endemic equilibrium point and local stability of endemic equilibrium point. Numerical result shows that if we increase culling of infected pigs and removal of contaminated food or water results in increase of susceptible pigs. The dynamic behavior of the model appears to be dependent on the culling of diseased pigs and the removal of contaminated food or water, according to numerical simulation. As a result, combining culling of infected pigs and removal of contaminated food or water as controls, it is possible to control the system in such a way that it approaches the desired state. , Thesis (MSc) -- Faculty of Sciences, School of Computer Science, Mathematics, Physics and Statistics, 2021
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  • Date Issued: 2021-12

Notions of Identity and place in University -Campus Architecture: The design of a school of the Built Environment at Lerotholi Polytechnic, Maseru

  • Authors: Mosese, Molefi
  • Date: 2021-12
  • Subjects: College buildings-- Africa-- Lesotho--Designs and plans , Campus planning -- designs and plans
  • Language: English
  • Type: Master's theses , text
  • Identifier: http://hdl.handle.net/10948/58650 , vital:59977
  • Description: Lerotholi Polytechnic is an institution of higher learning located in the heart of Maseru, Lesotho, and it was established in 1905, by the then paramount chief of Lesotho, Chief Lerotholi. Through time, the Polytechnic has seen growth in infrastructure as new needs arose. According to (Dewar and Louw, 2017), universities fall within institutions with great importance to society therefore, physical environments for these institutions should be functional and inspiring to the end user. Though this haphazard growth was perceived as good by the institution, there is little evidence of rational thought in the design throughout the campus and this expansion resulted in extremely isolated buildings on site, creating vast amounts of unused spaces, lack of attention to pedestrian movement and the lack of attention to existing green areas. The study employed in this document uses both primary and secondary data gathered from desktop research. This was gathered with site visits and observations made at Lerotholi Polytechnic, Maseru, Lesotho. This thesis document is aimed at investigating and understanding the notions of identity and place in university. campus architecture.The findings reveal that the building to be designed needs to act as an edge towards the undefined side of the campus that sits on the busy road passing adjacent to campus. This should also work as an activator to the abandoned buildings that are still structurally sound near the chosen site. Furthermore, this building should act as a gateway while promoting more of the pedestrian activity.It can be concluded that “Identity” and “Place “ in campus architecture are of utmost importance and are the two elements which will be improved with the new design. These will give a sense of belonging and for the environment to be utilized well for the users within it. , Thesis (MArch) -- Faculty of Engineering, the Built Environment and Technology, School of Architecture, 2021
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  • Date Issued: 2021-12

Ocean structures and dynamics of two open bays on the eastern Agulhas Bank

  • Authors: Dlomo, Xolisa
  • Date: 2021-12
  • Subjects: Port Elizabeth (South Africa) , Eastern Cape (South Africa) , South Africa
  • Language: English
  • Type: Doctoral theses , text
  • Identifier: http://hdl.handle.net/10948/53607 , vital:45680
  • Description: Upwelling, bay-scale currents, fronts and mixing in Algoa Bay and St Francis Bay occur over both short and long time periods. These physical ocean dynamics drive the temporal and spatial distribution of nutrients in the bays, there by influencing primary and secondary production. Thermal gradients and fronts are driven by the wind and open ocean influences, such as the Agulhas Current, daily and seasonal variations in solar radiation, long and short period waves, air-sea fluxes, coastal trapped waves and terrestrial freshwater inflow. These phenomena are poorly understood along this part of the coastline and were the focus of this study. I investigated the dominant temperature scales of variability in both bays, to determine which isotherm is best suited to describe temperature fluctuations and thermocline spatiotemporal variability in and between the two bays. I investigated upwelling spatiotemporal variability in the two bays and tested whether upwelling occurs at the opposite sides of the bays with a change in wind direction. Thereafter studied the occurrence and drivers of winter upwelling events. The wind-driven current spatiotemporal variability and correlations were investigated at the extremities of the two bays. The daily, intra-seasonal and yearly variation in temperature structures in Algoa Bay and St. Francis Bay were mainly driven by the local winds, coastal topography, and bathymetry. The most suitable isotherm to describe thermal fluctuations and variability in Algoa Bay shallower sites was 16.5 °C and its mean depth was 16.2 m. The best isotherm for the deeper sites in Algoa Bay was 15.7 °C with a depth of 33.1 m. The average temperature and depth of the best isotherm to describe thermal fluctuations in St. Francis Bay for the shallower sites was15.80 °C and 16.83 m, and for the deeper sites it was 15.10 °C and 32.08 m. Algoa Bay showed an average cooling trend of -0.000172 °C per year, whereas in St. Francis Bay a warming average trend of 0.0188 °C per year was observed over the study period often and six years, respectively. The wind, Coriolis Effect and Ekman Transport were the main external forces that influenced upwelling throughout the year. Since the available mesoscale indices for upwelling intensity lack the resolution needed to characterize and compare inner-shelf upwelling regimes at small spatial scales, I developed a new local, quantitative index of thermal variability. Index calculations were based on hourly records of in site depth-averaged temperatures, measured at 6 sites in St. Francis Bay and at 8 sites in Algoa Bay. Using the Multivariate Upwelling Zone Index of Cooling (MUZIC) I found that Woody Cape and Blue Horizon Bay had the highest upwelling intensity in Algoa Bay and St. Francis Bay, respectively. The other sites were ordinated and ranked according to their upwelling rates and intensity. Evidence of wind-driven winter upwelling was found to be a common occurrence in both bays. There was no obvious current seasonality observed, however, strong spectral signals in the period of a weather band (4 –7 days) were present. Current structures were generally positively correlated with wind variations in both bays. Thus, when westerly/easterly winds blew the overall surface current direction was eastward/westward. I observed a pronounced current spatiotemporal variability that was driven by local winds. The Bird Island surface currents in Algoa Bay were strongly correlated at 0–lag day with the winds, however, in Cape Recife the strongest correlations were usually observed at 1–lag day highlighting the spatiotemporal influence of wind regimes on current structures in Algoa Bay. Bird Island current speeds were higher and had an obvious bimodal directional variation (south westward /north eastward) compared to Cape Recife currents, which generally had a slower current speed with a strong west-north westward direction. In St. Francis Bay, the Schoenmakerskop surface currents showed weak positive correlation with winds at 0–lag day, however, stronger negative correlations were observed at 4–lag days. The current surface speeds in Schoenmakerskop were the lowest and varied directionally between north-north eastward and south-south eastward. The basic data requirements (i.e. SST/ UTR and ADCP time series) and the simplicity of the calculations make these indices a useful tool to apply to a large number of sites nationally and internationally, and to examine the generality of community and population-level responses to physical forcing. , Thesis (PhD) -- Faculty of Science, Journalsim and Media Studies, 2021
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  • Date Issued: 2021-12

Optimization of liposomes for enhanced stability against degradation by gastrointestinal fluid content

  • Authors: Scholtz, Carla Chleo
  • Date: 2021-12
  • Subjects: Port Elizabeth (South Africa) , Eastern Cape (South Africa) , South Africa
  • Language: English
  • Type: Master's theses , text
  • Identifier: http://hdl.handle.net/10948/54117 , vital:46305
  • Description: Motivation: Liposomes are nanoparticulate carriers consisting of a hydrophobic bilayer and a hydrophilic core. Their application as drug carrier systems arises from their unique physiochemical structure, biocompatibility and biodegradability. Their biphasic nature is significant in the delivery of peptide and protein drug molecules as it is thus able to encompass both hydrophobic and hydrophilic molecules. Liposomes are actively being used for drug delivery intravenously. These formulations have been successful in reducing side effects and improving therapeutic efficacy. However, the intravenous route poses many challenges and is not the preferred route of administration amongst patients. The oral route of administration is non-invasive, and administration is of ease, therefore it is the preferred route of administration amongst patients, especially those with complex medicine regimes. Problem: The gastrointestinal tract is a harsh environment. In order for liposomes to maintain their integrity during their course they require a level of stability against gastric and intestinal fluids and its associated constituents such as gastric and pancreatic enzymes, low pH and bile acid. Methodology: Based on recommendations extrapolated from literature, the incorporation of a bile salt, sodium glycocholate, into liposomes in conjunction with coating the surface with chitosan was selected as the optimization strategies to enhance the stability of liposomes against degradation in the gastrointestinal tract. Bilosomes with encapsulated calce in were produced using the thin-film hydration method and coated with chitosan. An in vitrocalce in release assay was conducted in simulated gastric and intestinal fluids which presented with in vivo conditions in terms of pH and enzymes and additional constituents such as a bile salt. Stability was determined by the extent of digestion within the simulated fluids with time. Results: Characterization results suggested that the addition of chitosan and sodium glycocholate to the liposomal formulation has significant effects on the physiochemical properties. The colloidal dispersions could not retain their stability during storage which was noticeable during HRTEM. Despite optimization of the liposomes, in vitro studies showed significant release in both simulated gastric and intestinal fluids, with majority release seen in the presence of pepsin and pancreatic, at low pH and in the presence of bile acid. , Thesis (MSc) -- Faculty of Science, School of Computer Science, Mathematics, Physics and Statistics, 2021
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  • Date Issued: 2021-12
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