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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
261

The evaluation of biological, mechanical and chemical methods to contain South African abalone species (Haliotis midae)

Fourie, Lize 04 1900 (has links)
Thesis (MScAgric)--Stellenbosch University, 2014. / ENGLISH ABSTRACT: Haliotis midae (HM) is one of five indigenous abalone species occurring along the coast of South Africa, and is the only species commercially cultivated in open flow-through systems. Commercial production of HM contributes the most to income generated from aquaculture species in South Africa. Exports in 2011 totalled 1036 ton, which amounts to an income of ZAR 369 million (40 million USD). Commercial production of HM is characterized by a long interval (i.e. up to five years) to harvest. Genetic modification of HM to improve growth rate in HM can potentially decrease the interval from hatch to harvest, which will contribute to optimising the cost-efficient production of HM. However, a major concern in the production of genetically modified (GM) abalone is their escape from production systems, and the potential impact of the GM animals on the natural stocks in the surrounding environment. The implementation of containment methods to prevent the escape from GM abalone from production systems will assist in the management of the potential ecological risks escaped GM abalone may pose. Currently no containment strategies exist for the South African abalone industry, which limits the use of transgenic biotechnologies to optimise the cost-efficient production of HM. The study therefore investigated the potential of biological methods (triploid induction), mechanical methods (polypropylene filter bags and obstructive materials), and chemical methods (sodium hypochlorite and chlorine dioxide) to contain transgenic HM in open flow-through systems. Histological evaluation of gonad tissue samples of 16 triploid male and 15 triploid female HM indicated that triploid induction was unsuccessful in arresting gonad differentiation, development, and function. A combination of immature and mature gametes was observed on both triploid male and female gonads. The fertilizing potential of biopsied sperm obtained from triploid and induced diploid male HM was assessed in fertilization trials using ova obtained from diploid HM. No larvae were observed from the fertilization treatments of triploid male biopsied sperm, however, abnormal larvae (0.01% fertilization) were observed when induced diploid sperm were used to fertilize diploid ova. Polypropylene filter bags (100 μm) were not effective in containing male and female gametes in the broodstock section of the abalone culture system used in this study, and future studies should address specialized methods of containment of HM gametes. Polypropylene filters (100 μm), resulted in effective containment of larvae and settlement larvae, and in this study was not a more effective method of containment than the current on-farm larvae containment protocol. The three obstructive materials were effective in containing HM spat, and did not differ in their ability as containment methods. Sodium hypochlorite and Biox™, chlorine-based chemicals, were effective in containing the five life stages of HM, i.e. sperm, ova, larvae, settlement larvae and spat. The respective life stages were exposed to varying concentrations of the respective chemicals (i.e. 10 ppm, 50 ppm and 100 ppm) over five exposure times (i.e. 4, 6, 8, 10 and 12 minutes). Sodium hypochlorite and Biox™, at the different concentrations and exposure times, resulted in mortalities in all five HM life stages, with higher incidences recorded at the higher concentrations evaluated. Future research on the effect of triploid induction on the endocrine system, and how effective gonad maturation and function is suppressed, needs to be conducted. The aspects of mosaics occurring in induced diploid animals warrant further investigation with a larger sample size to verify the findings of this study. The production of true sterile individuals would improve the results to use of GM animals as a method of biological containment. Incorporation of mechanical containment methods need to be kept in mind when abalone production systems are designed. The use of chemical containment methods warrants additional studies on the practical administration and the economic feasibility of the chemical into the water supply of open flow-through abalone culture systems. / AFRIKAANSE OPSOMMING: Haliotis midae (HM) is een van vyf inheemse perlemoen spesies wat langs die kus van Suid-Afrika voorkom en is die enigste spesie wat kommersieel in oop deurvloeistelsels geproduseer word. Kommersiële produksie van HM dra die meeste tot kommersiële akwakultuur produksie by, met uitvoere van 1036 ton in 2011, wat gelykstaande aan ‘n inkomste van ZAR 369 miljoen (40 miljoen VSA dollar). Kommersiële produksie van HM word gekenmerk deur 'n lang interval (d.i. tot 5 jaar) vanaf uitbroei tot oes. Genetiese modifisering van HM om die groeitempo te verbeter kan potensieel die interval tot slagmassa verkort, wat potensieel tot die optimalisering van die kostedoeltreffende produksie van HM kan bydra. 'n Groot bron van kommer met die produksie van geneties gemodifiseerde (GM) perlemoen is hul ontsnapping uit produksiestelsels en die potensiële impak van die GM diere op die natuurlike perlemoenpopulasies in die omliggende omgewing. Die implementering van beheermetodes om die ontsnapping van GM perlemoen uit produksiestelsels te voorkom sal die bestuur van die potensiële ekologiese risiko's wat GM perlemoen mag inhou, vergemaklik. Tans bestaan daar geen inperking strategieë vir GM diere vir die Suid-Afrikaanse perlemoenbedryf nie, wat die gebruik van transgeniese biotegnologieë vir die kostedoeltreffende produksie van HM beperk. Die studie het dus die potensiaal van biologiese metodes (triploïed induksie), meganiese metodes (polipropileen filters en obstruktiewe materiaal) en chemiese metodes (natriumhipochloriet en Biox™) om as inperk strategieë vir die bestuur van transgeniese HM in oop deurvloei produksiesisteme gebruik te word, ondersoek. Histologiese evaluering van gonadeweefsel monsters van 16 manlike en 15 vroulike triploïed HM het aangedui dat triploïed induksie onsuksesvol was om gonade differensiasie, ontwikkeling, en funksie te onderdruk. 'n Kombinasie van onvolwasse en volwasse gamete is in gonades van beide manlike en vroulike triploïed HM waargeneem. Die bevrugtingsvermoë van sperme wat versamel is met behulp van ʼn biopsie metode van triploïed en geïnduseerde diploïed HM is geëvalueer in bevrugtingsproewe met ova wat van diploïed HM versamel is. Geen larwes is waargeneem met die gebruik van die triploïed sperme nie, maar abnormale larwes (0.01% bevrugting) het wel voorgekom met die evaluering van sperme versamel van geïnduseerde diploïed HM. Die voorkoms van mosaïek diere (d.i. ʼn kombinasie van beide diploïed en triploïed selle in een individu) wat ontstaan a.g.v. onvolledige triploïed induksie noodsaak verdere navorsing met ʼn groter monster diere om die vermoë van triploïed induksie om HM steriel te maak, te verifieer. Polipropileen filters (100 μm) was nie effektief om beide manlike en vroulike gamete wat in die teelafdeling in die perlemoenkultuursisteem in hierdie studie geproduseer is, vas te vang nie. Toekomstige studies moet gespesialiseerde metodes wat insluiting van HM gamete moontlik sal maak, ondersoek. Polipropileenfilters (100 μm) was effektief met die inkamping van larwes en vestigingslarwes, met die filters wat nie meer doeltreffend as die bestaande inkampingsmetodes in die produksiesisteem was nie. Die drie obstruktiewe materiale was doeltreffend ten opsigte van die inkamping van onvolwasse perlemoen individue, met die 3 materiale wat ewe doeltreffend in hulle vermoë was om die onvolwasse HM se ontsnapping uit die sisteem te voorkom. Natriumhipochloriet en Biox™, chloor-gebaseerde chemikalieë, was effektief om die onderskeie 5 lewenstadiums, d.i. HM sperme en ova, larwes, vestigingslarwes en onvolwasse HM se voorkoms tot hulle onderskeie afdelings binne die produksiesisteem te beperk. Die onderskeie lewensstadiums is blootgestel aan verskillende konsentrasies van die onderskeie chemikalieë (d.i. 10 dpm, 50 dpm en 100 dpm) oor vyf tydsintervalle (d.i. 4, 6, 8, 10 en 12 minute). Natriumhipochloriet en Biox™ het ʼn letale effek op al vier lewensstadia gehad, met hoër sterftes wat met hoër konsentrasies aangeteken is. Toekomstige navorsing oor die uitwerking van triploïed induksie op die endokriene stelsel en hoe doeltreffend die rypwording en funksie van die gonades onderdruk word, moet aandag geniet. Die voorkoms van mosaïek diere regverdig ook spesifieke aandag in toekomstige navorsing. Die produksie van ware steriele individue sou die gebruik van GM perlemoen as 'n metode van biologiese inkamping moontlik maak. Inlywing van meganiese inkampingmetodes moet in gedagte gehou word wanneer perlemoen produksiestelsels ontwerp word. Die gebruik van chemiese inkampingmetodes benodig verdere studies om te verseker dat die chemiese middels so bekostigbaar en prakties as moontlik in water van 'n oop deurvloei perlemoen produksiestelsel toegedien kan word.
262

The effect of timing of stripping on hop production under South African conditions

Joseph, Beverley-Anne 12 1900 (has links)
Thesis (MSc)--Stellenbosch University, 2015. / ENGLISH ABSTRACT: Hops is a small, but important agricultural commodity in South Africa. The hop cones contain secondary metabolites responsible for the flavour, aroma and bitterness in beer. The George and Waboomskraal area are the best suited for growing hops due to climate and geographical location. The optimum latitude for hops growing is 45° - 54° north and south of the equator, while these areas are at 34° S. International hop varieties are not adapted to the South African climate. Winters are too warm and summer days too short, thus all the varieties grown in South Africa have been bred for these specific conditions. The Hop breeding and research program strives to develop internationally competitive varieties with higher yields, desirable brewing characteristics, reducing input costs and increased productivity. To evaluate the current agricultural practices and to determine whether some of these practices negatively affect the plant health and yield, a study was conducted to investigate the effect of the time of stripping. Stripping refers to the practice of removing basal growth of the lower laterals and untrained bines. The study was done in two different microclimates, namely George and Waboomskraal. The aim was to determine the effect of the time of stripping on the vegetative growth, light interception, biomass, soft resins (alpha and beta acids), yield, rootstock weights and carbohydrate concentrations. The effect of stripping was also evaluated on different planting systems and plant maturity, namely Tram lines and conventional planting and 3 years old versus 5 year old plants. The effect of early stripping in terms of dry weight on mature plants is considerably less than the effect on younger plants. Young plants delivered lower dry weights, but accumulated higher carbohydrate reserves in the early stripping treatment. On young plants early stripping showed a significant difference favouring yield on tramlines. There is a general trend across all sites of higher crop efficiencies in the early stripped treatments. Growers could significantly increase yields without negatively affecting the quality (alpha and beta acids) by applying early stripping, especially in the George area. The effect of early stripping becomes more apparent in consecutive years as the time of defoliation affects foliage, carbohydrate concentration, canopy microclimate and light interception resulting in increased yields, especially on tramlines. From this study it can be concluded that early stripping appeared to have an influence on the dry root weight, carbohydrate concentration, light interception, crop efficiencies, yield and biomass. This practice is not only environmentally friendly by using less herbicide, it also delivers an economic gain. The effect of the time of stripping in consecutive years and different varieties deserves further study. / AFRIKAANSE OPSOMMING: Hops is 'n klein, maar belangrike landbou kommoditeit in Suid-Afrika. Die hopkeëls bevat sekondêre metaboliete wat verantwoordelik is vir die smaak, aroma en bitterheid van bier. Die George en Waboomskraal gebied is die beste geskik vir die kweek van hops, a.g.v. die klimaat en geografiese ligging. Die optimum breedtegraad vir hops verbouing is tussen 45° - 54° noord en suid van die ewenaar, waar hierdie gebiede by 34° S lê. Internasionale hops varieteite is nie aangepas by die Suid-Afrikaanse klimaat nie, want die winters is te warm en die daglengte in die somer is te kort. Al die variëteite in Suid Afrika is geteel vir dié spesifieke klimaatstoestande. Die Hopsteling en -navorsingprogram streef daarna om internasionaal mededingende varieteite met hoër opbrengste, verminderde insetkoste, verhoogde produktiwiteit en wenslike broueienskappe te ontwikkel. 'n Studie is gedoen om die effek van stropingstyd te evalueer en te identifiseer of hierdie praktyk negatiewe invloede op die gesondheid van plante en opbrengste het. Stroping verwys na die praktyk van die verwydering van basale groei van die laer laterale en onopgeleide ranke. Die studie is gedoen in twee verskillende mikroklimate, naamlik George en Waboomskraal. Die doel was om te bepaal wat die effek van stropingstyd op die vegetatiewe groei, lig onderskepping, biomassa, alfasure en betasure, opbrengs, wortelmassa en koolhidrate konsentrasies is. Die effek van stropingstyd was ook geëvalueer op verskillende plantsisteme en plant volwassenheid, naamlik Tramlyne en Konvensionele -plantsisteem, en 3 jaar oue teenoor 5 jaar oue plante. Die effek van vroeë stroping in terme van droë gewig op volwasse plante is aansienlik minder as die effek op jonger plante. Jong plante het laer droë gewig, maar hoër koolhidraat reserwes in die vroeë stroping behandeling gelewer. Vroë stroping van jong plante het ’n beduidende verskil getoon ten opsigte van opbrengste op die Tramlyn-plantsisteem. Daar is 'n algemene tendens op alle lokaliteite van hoër opbrengs doeltreffendheid in die vroeë stropings behandelings. Produsente, veral in die George area, kan opbrengste aansienlik verhoog sonder om die kwaliteit (alfa en beta sure) negatief te beïnvloed, deur die toepassing van vroeë stroping. Die effek van vroeë stroping word meer duidelik in agtereenvolgende jare, omdat die stropingstyd die koolhidrate konsentrasie, mikroklimaat binne in die hopranke en lig onderskepping wat lei tot verhoogde opbrengste, veral op die Tramlyn- plantsisteem, beïnvloed. Uit hierdie studie kan afgelei word dat vroeë stroping 'n invloed op die ligonderskepping, plantgewas doeltreffendheid, biomassa, opbrengs, droë wortelgewig en koolhidraatkonsentrasie het. Hierdie praktyk is nie net omgewingsvriendelik nie, maar gebruik minder onkruiddoder en lewer ekononomiese voordele vir die produsent. Die effek van stropingstyd op agtereenvolgende jare en verskillende varieteite verdien verdere studie.
263

Effect of pleistocene climatic changes on the evolutionary history of South African intertidal gastropods

Muteveri, Tinashe 03 1900 (has links)
Thesis (PhD)--Stellenbosch University, 2013. / ENGLISH ABSTRACT: Historical vicariant processes due to glaciations, resulting from the large-scale environmental changes during the Pleistocene (0.012-2.6 million years ago, Mya), have had significant impacts on the geographic distribution of species, especially also in marine systems. The motivation for this study was to provide novel information that would enhance ongoing efforts to understand the patterns of biodiversity on the South African coast and to infer the abiotic processes that played a role in shaping the evolution of taxa confined to this region. The principal objective of this study was to explore the effect of Pleistocene climate changes on South Africa′s marine biodiversity using five intertidal gastropods (comprising four rocky shore species Turbo sarmaticus, Oxystele sinensis, Oxystele tigrina, Oxystele variegata, and one sandy shore species Bullia rhodostoma) as indicator species. Sequence data obtained from partial segments of the mitochondrial cytochrome oxidase c subunit 1 (COI), and the nuclear ribosomal DNA (encompassing part of 5.8S, second Internal Transcribed Spacer and part of 28S, hereinafter called ITS2; or comprising part of the first Internal Transcribed Spacer, 5.8S, second Internal Transcribed Spacer and part of 28S, hereinafter called ITS), were used as genetic markers to construct phylogeographic patterns and to investigate demographic histories of the taxa. Population structure was investigated using haplotype network analyses, pairwise ΦST statistics, analysis of molecular variance (AMOVA), isolation by distance analyses, Bayesian analysis of population structure (BAPS) and coalescent analysis of gene flow. Demographic history was analysed through Fu′s Fs tests, mismatch distributions, and Bayesian skyline plots. Demographic analyses suggest that all five intertidal gastropods studied experienced demographic expansions dating to the late Pleistocene. The sandy shore direct developer B. rhodostoma began expansion after the LGM (c. 15 kya) whereas for the four rocky shore broadcast spawners (T. sarmaticus, O. sinensis, O. tigrina, and O. variegata) the onset of expansion coincided with or preceded the LGM (c. 25, 60, 50, 40 kya, respectively). Consistent with recent range expansions and gene flow patterns, the population genetic structure in all species was characterised by shallow or a lack of population differentiation. Oxystele variegata was an exception as it showed a deep disjunction, of late Pleistocene origin, between individuals in the west coast Namaqua Bioregion and those in the south coast Agulhas Bioregion. These results provide strong evidence of the vital role that Pleistocene climatic changes and current regimes played in shaping the nature and distribution of biodiversity on the South African coast. In addition, gene flow in all species, except O. tigrina, was remarkably asymmetrical with the regions around Cape Infanta and Port Elizabeth acting as source populations. Considering the generally weak population genetic structure and gene flow patterns detected for most gastropod species studied here, it is recommended that T. sarmaticus, O. sinensis, O. tigrina and B. rhodostoma be managed as panmictic populations, and that the region encompassing Cape Infanta, and Port Elizabeth should be prioritised for conservation as it appears to harbour source populations. Oxystele variegata was the only species showing distinct population structure and in this instance, species specific conservation efforts should recognize this divergence by treating the two genetic assemblages as distinct management units. / AFRIKAANSE OPSOMMING: Historiese vikariante prosesse kan toegeskryf word aan glasiasie, en het tot gevolg gehad dat grootskaalse veranderinge in die omgewing plaasgevind het tydens die Pleistoseen (,012 - 2.6 miljoen jaar gelede, Mjg). Dit het 'n beduidende impak gehad op die geografiese verspreiding van spesies, veral ook in die mariene stelsels. Die motivering vir hierdie studie was om nuwe data te voorsien wat sal bydrae tot die voortgesette pogings om die patrone van biodiversiteit langs die Suid-Afrikaanse kus te verstaan. Dit sou ook help om die abiotiese prosesse af te lei wat 'n rol gespeel het in die evolusie van taksa wat in hierdie streek voorkom. Die hoofdoel van hierdie studie was om die effek van die Pleistoseen klimaatsveranderinge op Suid-Afrika se mariene biodiversiteit te bepaal deur gebruik te maak van vyf intergety slak spesies as indikatore (vier wat in rotsagtige gebiede voorkom: Turbo sarmaticus, Oxystele sinensis, Oxystele tigrina, Oxystele variegata en 'n sanderige strand spesies: Bullia rhodostoma). Volgorde data verkry vanaf gedeeltelike segmente van die mitochondriale sitochroom oksidase c subeenheid 1 (COI), en die kern ribosomale DNA (bestaande uit 'n deel van 5.8S, tweede interne getranskribeerde spasieërders en 'n deel van 28S), hierna genoem ITS2 is gebruik as genetiese merkers om filogeografiese patrone te dokumenteer en ook om die demografiese geskiedenis van die spesies te ondersoek. Bevolking struktuur is ondersoek deur gebruik te maak van haplotipe netwerk analise, paarsgewyse ΦST statistiek, analise van molekulêre variansie (AMOVA), isolasie deur afstand analise, Bayesiaanse analise van die bevolking struktuur (BAPS) en analise van gene vloei. Demografiese geskiedenis is ontleed deur Fu se Fs toetse, misparing verdelings, en Bayesiaanse luglyn kurwes. Demografiese ontleding dui daarop dat al vyf die intergety slakke wat ondersoek is demografiese uitbreidings ervaar het wat terugdateer tot die einde van die Pleistoseen. Die sanderige strand direkte ontwikkelaar, B. rhodostoma, het die uitbreiding begin na die LGM (c. 15 Kya), terwyl vir die vier rotsagtige kusbewoners wat eiers oor 'n uitgebreide gebiede versprei (T. sarmaticus, O. sinensis, O. tigrina, en O. variegata) het die aanvang van die bevolkings uitbreiding saamgeval met die laaste galsiasie of dit voorafgegaan (c. 25, 60, 50, 40 Kya, onderskeidelik). In ooreenstemming met die onlangse reeks bevolkings uitbreidings, is die bevolking genetiese struktuur in alle spesies gekenmerk deur weinig differensiasie. Oxystele variegata was 'n uitsondering en het 'n ontwrigting van laat Pleistoceen oorsprong getoon tussen individue langs die weskus Namaqua Biostreek en dié in die suid kus Agulhas biostreek. Hierdie resultate voorsien sterk bewyse van die belangrike rol wat die Pleistoseen klimaatsveranderinge gespeel het in die vorming en verspreiding van biodiversiteit langs die Suid-Afrikaanse kus. Daarbenewens, geen vloei in alle spesies, behalwe O. tigrina, was merkwaardig asimmetries. Kaap Infanta en Port Elizabeth verteenwoordig moontlik die bron bevolkings. Met inagneming van die geringe bevolking genetiese struktuur en geenvloei patrone wat waargeneem is vir die meeste slak spesies wat bestudeer is, word dit aanbeveel dat T. sarmaticus, O. sinensis, O. tigrina en B. rhodostoma bestuur word as 'n panmiktiese bevolking, en dat die streek wat Kaap Infanta en Port Elizabeth insluit geprioritiseer moet word vir bewaring. Oxystele variegata was die enigste spesie wat duidelike bevolking struktuur getoon het en in hierdie geval, moet spesie spesifieke bewaringspogings aangewend word.
264

The feasibility and challenges of implementing the essential drugs programme into occupational health services.

Petzer, Shaun January 2006 (has links)
<p>The Essential Drugs Programme (EDP) is one of the tools developed to achieve the objectives of the South African National Drug Policy. Occupational health (OH) services are largely in the private sector and usually provide an element of Primary Health Care in addition to Occupational Hygiene, Medicine and Nursing. The aim of this study was to determine the challenges of implementing the Essential Drugs Programme into Occupatinal Health settings in the Port Elizabeth and East London areas. A descriptive cross-sectional study was carried out. Respondents cited the evidence-based approach to management of clients as a motivating factor for adopting the EDP in Occupational Health clinics.</p>
265

Family psychosocial well-being in a South African context / Vicki Koen

Koen, Vicki January 2012 (has links)
“The family is the building block of society. It is a nursery, a school, a hospital, a leisure centre, a place of refuge and rest. It encompasses the whole of society. It fashions our beliefs; it is the preparation for the rest of our life,” Margaret Thatcher (1988). We are all well aware of the important role of family in people’s lives, we know it can affect you, empower you, or break you. Many studies and research has sought to define the role and influence of family in every which way, but truthfully, we can never know enough and we will never know everything. As human beings, we constantly strive for more – more knowledge, more understanding, and more insight. But the family, in essence, is a mystery; a far too complex and unique system that cannot be broken down into simple numbers or words. It is this that inspired me to do this study – although we can never know everything, we can always know more. This study therefore aimed to investigate the psychosocial well-being of a group of families and from the findings obtained, develop a conceptual framework and a model for psychosocial well-being of families from diverse cultures in a South African context. The research method consisted of two stages namely, stage one: a multi-method approach using quantitative and qualitative research for theory generation, and stage two: formulation of a conceptual framework and visual model. The first phase consisted of a quantitative research design with a sample size of 772 participants. The aim of the first phase was to determine the prevalence of psychosocial well-being in families and to identify families who report high, moderate and low levels of psychosocial well-being, using validated psychological instruments. The second aim of the quantitative phase was to propose a measurement model to assess family psychosocial well-being in a South African context. The second phase consisted of a qualitative, explorative research design used to understand and describe aspects that contribute to the psychosocial well-being of families from diverse cultures in a South African context, by analysing the storied (narrative) experiences (N = 23), drawings (N = 14) and family interviews (N = 36) of identified families who reported psychosocial well-being or less thereof, in the first phase of the study (Creswell, 2003). These findings were then utilized to develop a conceptual framework followed and a model for the psychosocial well-being of families in a South African context. The findings from the first, quantitative phase show a rather small group of participants who report high levels of family psychosocial well-being, while the majority falls within the low and moderate ranges, and approximately 64% of the participants are not experiencing optimal psychosocial well-being. The results support a two-factor model of family psychosocial well-being consisting of family functioning and family feelings. Family functioning included family relational patterns, family functioning style and family hardiness while the second factor, family feelings, included family satisfaction and attachment. The findings from the qualitative phase suggest that communication, mutual support, togetherness as a family and spirituality are the most prominent contributing factors, whilst financial difficulties and interpersonal conflicts or arguments are the most prominent hindering factors with regard to family psychosocial well-being in this group of participants. These findings were utilized to develop a conceptual framework and a model for the psychosocial well-being of families from diverse cultures in a South African context that can be used in future research and in the development of programmes to enhance the psychosocial well-being of South African families. / PhD, Psychology, North-West University, Vaal Triangle Campus, 2012
266

The effect of credit risk management on the profitability of the four major South African banks

07 October 2015 (has links)
M.Com. (Financial Management) / It has been argued that inadequate credit risk management practices and high levels of credit risk was the cause of the 2007 to 2009 global financial crisis, as well as the banking crises over the two past decades, including the 1997 East Asian crisis. As a result, banks have increasingly prioritised credit risk management to ensure acceptable levels of profitability and to keep them from collapsing. However, research on the relationship between credit risk management and profitability in banks in South Africa remains limited. Therefore, this study addressed the question of whether credit risk management has an effect on profitability in South Africa’s four major banks. A quantitative approach was used to establish the relationship between profitability, represented by return on equity (ROE), and credit risk management, represented by two variables, namely capital adequacy ratio (CAR) and the non-performing loans ratio (NPLR). Secondary data for the years 2002 to 2013 was analysed using panel regression and the study concludes that not only does credit risk management have an effect on profitability in South African banks, but that bank size, operating expenses and economic growth also affect the profitability of South African banks. These findings would enable the enhancement of profitability in South Africa through constantly improving credit risk management practices and policies, and by addressing other factors that can negatively affect profitability.
267

The contribution of records management towards an organisation's competitive performance

12 January 2009 (has links)
D. Litt. et Phil. / The purpose of this study was to determine the extent to which the information user’s behaviour and proper records management contribute to the performance of an organisation to ensure competitive survival. The purpose of records management in an organisation, the records life cycle in an organisation from the creator to the end-user and electronic records management were thoroughly explored. A survey was conducted to investigate the current position of the records management function at South African National Parks (SANParks) as well as the manner in which records as information sources are used by end-users (employees). Based on the survey results, it was discovered that SANParks as an organisation does not practice sound records management as preached by Section 13 of the National Archives and Records Service of South Africa Act (No. 43 of 1996 as amended). There is no consistency with regard to filing methods and the manner in which records are destroyed or deleted tells that there is no officially appointed records manager at SANParks. Even though information is considered the most vital resource for the future survival of SANParks, records as the main source of information are neglected and managed voluntarily by end-users themselves. There are no control measures for ensuring care and safe custody of records. An e-mail policy, filing procedure manual and disaster recovery plan do not exist. End-users are seen managing records on their own and there is no policy or guideline to ensure proper measurement and effective control of records. The lack of records management at SANParks indirectly affects the information user behaviour of employees to achieve competitive performance. The current means of communication dictates the manner in which records are managed. Since electronic means of communication are used most often, records management at SANParks is drastically shifting from manual to electronic. Recommendations for records management procedures within the context of empirical survey findings, the statutory framework and international standards are made. In conclusion, it is recommended that the records management function should form part of performance appraisal evaluation and that all members of staff should be evaluated in terms of their record-keeping skills.
268

Exploring perceptions of termination of pregnancy among psychology Honours students at a higher education institution in the Western Cape, South Africa

Tsematse, Keitumetse January 2018 (has links)
Magister Psychologiae - MPsych / The South African Choice on Termination of Pregnancy (CTOP) Act (no. 92 of 1996) regulates the process of termination of pregnancy in the country. However, research has shown noncompliance to the stipulation leading to clandestine practices, ostracism and lack of knowledge regarding the Act. The aim of this study was thus to explore perceptions of Psychology Honours students toward termination of pregnancy as well as to investigate their knowledge of the CTOP Act and assess how far the legislature informs their perceptions, if at all. Although CTOP Act legislation stipulates pre and post CTOP counselling, evidence suggests that few women seeking termination of pregnancy (TOP) rarely receive counselling as envisaged. Numerous challenges were indicated as factors affecting the implementation of this stipulation. Considering this evidence, the way that prospective mental health care professionals such as Psychology Honours students’ – perceptions toward TOP were regarded pivotal in engaging with the implementation of the TOP legislature. A qualitative exploratory research design was used to explore and describe the perceptions that Psychology Honours students have toward TOP. Individual interviews with 15 students from a historically disadvantaged university in the Western Cape were conducted and recorded. The collected data was transcribed verbatim and thematically analyzed using Braun and Clarke’s model of Thematic Analysis. The results from the collected data reveal complex perceptions toward TOP. Participants reflected gradual modification of their perspectives due to exposure to different contexts and views in tertiary institutions, different friends and social engagements. Most participants indicated a religious background, however, indicated deviation from religious prescriptions pertaining to TOP.
269

The measurement of posttraumatic growth : an evaluation of the factor structure of the Posttraumatic Growth Inventory in a South African sample.

Roe-Berning, Shelley 25 February 2014 (has links)
More than a decade of research has indicated that individuals who have experienced traumatic events may report positive psychological changes as a result of their struggle to cope with the impact of the event. This cluster of changes has been labelled posttraumatic growth (PTG). Several measurement instruments have been developed to quantify such growth, one of the most widely used being the Posttraumatic Growth Inventory (PTGI) developed by Tedeschi and Calhoun (1996). The objective of the present study was to conduct a confirmatory factor analysis (CFA) of the PTGI on data yielded by a South African sample, to determine if the hypothesised factor structure showed appropriate fit in this context. Analyses were performed with three hypothesised models: the five factor model, the three factor model and the model of posttraumatic growth as a unitary factor. Whilst the results of the CFA did not provide overt support for the adequate fit of the models tested, it did yield a profile of PTG in the South African sample that is similar to that of samples from other countries of origin. The findings implied that the factorial validity of the PTGI is unclear and the inventory may require modification for use in the South African context. This highlighted the need for further investigation in order to provide a comprehensive exploration of the PTGI and its applicability in this context. This is in line with the current focus on the socio-cultural and contextual elements that may influence the perception of PTG.
270

An exploratory study into the perceptions of young Muslim South African adults regarding marriage.

Hassim, Rayhanah Moosa 24 February 2014 (has links)
Marriage is an important phenomenon that occurs in most societies across the world. Within the Islamic belief system, marriage is regarded as a sacred union and is obligatory on all Muslim people. This qualitative study explored the perceptions that eight young Muslim South African adults have regarding marriage, using semistructured interviews. The data was analysed by following a thematic content analysis framework which highlighted aspects such as the extent to which participants ascribed to their religious beliefs regarding marriage, any societal influences that may have shaped their views on marriage as well as the factors they believed lead to the success as well as the breakdown of marriages. From the results, it was evident that young Muslim South African adults had positive views on marriage, and expected to get married at some point in their lives. This was primarily due to their religious Islamic backgrounds and family upbringings. Moreover, the results indicated that young Muslim adults are more flexible with regard to engaging in pre-marital romantic relationships, yet continued to hold marriage in high regard. Participants outlined factors such as teamwork from spouses, trust, commitment, understanding, honesty as well as communication between spouses as integral in achieving and maintaining a successful marriage. These perceptions are discussed in relation to findings from other studies. The need for pre-marital programmes for young Muslim adults is highlighted.

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