An investigation of the relative importance of the media in influencing the voting behaviour of Evelyn Hone College students in Lusaka during the December, 2001 presidential elections in Zambia
- Authors: Jere, Caesar
- Date: 2003
- Subjects: Voting -- Zambia Mass media -- Political aspects -- Zambia Presidents -- Zambia -- Election -- 2001
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3516 , http://hdl.handle.net/10962/d1007803
- Description: This study explores the relative importance of the media in influencing the electoral choices of a small group of Zambians, namely Evelyn Hone College students in Lusaka who participated in the December 2001 elections in Zambia. The study investigates the interplay of mediation between the lived cultural experiences of the sample of students and the impact of media messages. Students at Evelyn Hone College come from different ethnic groupings, social classes, religions and regions. They are exposed to both the state and the privately owned media, which represent a range of political viewpoints. The outcome of the December 2001 elections in Zambia gave the impression that people in urban areas in Zambia were less likely to vote on ethnic lines because they had easy access to different media, ranging from print to electronic, which provided them with diverse information about the political scene, and probably shaped their electoral choices. Conversely, their counterparts in the rural areas appeared to vote along ethnic lines, seemingly because of lack of exposure to the media. It was also assumed that most people in rural areas were not as modernized as their urban counterparts who were more exposed to enlightened sources of information such as professional groups and other elite social institutions which helped them to shape their political opinions than most rural people. The study attempts to establish to what extent the media impacted on the selected sample of urban students in the choice of their presidential candidates in the December 2001 elections in Zambia. The study further investigates to what extent other factors such as ethnic inclinations and other social predispositions influenced them in their choice of the candidates. The interviewees for this study were randomly drawn from a population of Evelyn Hone College students that voted in the December 2001 presidential elections in Zambia. The sample consisted of 30 randomly selected students who were purposely stratified in three focus groups of ten each. Each stratum represented the approximate ethnic equivalence of one of the presidential candidates who contested the December 2001 elections.
- Full Text:
- Date Issued: 2003
- Authors: Jere, Caesar
- Date: 2003
- Subjects: Voting -- Zambia Mass media -- Political aspects -- Zambia Presidents -- Zambia -- Election -- 2001
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3516 , http://hdl.handle.net/10962/d1007803
- Description: This study explores the relative importance of the media in influencing the electoral choices of a small group of Zambians, namely Evelyn Hone College students in Lusaka who participated in the December 2001 elections in Zambia. The study investigates the interplay of mediation between the lived cultural experiences of the sample of students and the impact of media messages. Students at Evelyn Hone College come from different ethnic groupings, social classes, religions and regions. They are exposed to both the state and the privately owned media, which represent a range of political viewpoints. The outcome of the December 2001 elections in Zambia gave the impression that people in urban areas in Zambia were less likely to vote on ethnic lines because they had easy access to different media, ranging from print to electronic, which provided them with diverse information about the political scene, and probably shaped their electoral choices. Conversely, their counterparts in the rural areas appeared to vote along ethnic lines, seemingly because of lack of exposure to the media. It was also assumed that most people in rural areas were not as modernized as their urban counterparts who were more exposed to enlightened sources of information such as professional groups and other elite social institutions which helped them to shape their political opinions than most rural people. The study attempts to establish to what extent the media impacted on the selected sample of urban students in the choice of their presidential candidates in the December 2001 elections in Zambia. The study further investigates to what extent other factors such as ethnic inclinations and other social predispositions influenced them in their choice of the candidates. The interviewees for this study were randomly drawn from a population of Evelyn Hone College students that voted in the December 2001 presidential elections in Zambia. The sample consisted of 30 randomly selected students who were purposely stratified in three focus groups of ten each. Each stratum represented the approximate ethnic equivalence of one of the presidential candidates who contested the December 2001 elections.
- Full Text:
- Date Issued: 2003
An object relational psychoanalysis of selected Tennessee Williams play texts
- Authors: Tosio, Paul
- Date: 2003
- Subjects: Williams, Tennessee, 1911-1983 Williams, Tennessee, 1911-1983 -- Knowledge -- Psychology Object relations (Psychoanalysis) Psychoanalysis Drama -- Psychological aspects
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2150 , http://hdl.handle.net/10962/d1002382
- Description: Tennessee Williams is a playwright of great psychological depth. This thesis probes some of the complexities of his work through the use of Object Relational Psychoanalysis, specifically employing the theories of Melanie Klein, W.R.D. Fairbairn and Donald Winnicott. The Glass Menagerie, A Streetcar Named Desire, Cat On A Hot Tin Roof and The Night of The Iguana are analysed from this theoretical stance. All of these plays display great perceptiveness into the human condition, accurately portraying many psychological relational themes. Certain Object Relational themes become very apparent in these analyses. These themes include, Dependency (especially in The Glass Menagerie), Reparation (particularly in A Streetcar Named Desire), Falsehood (notably in Cat on a Hot Tin Roof), Idealisation (evident in The Night of The Iguana), Honest Empathetic Relations (apparent in Cat on a Hot Tin Roof and The Night of The Iguana) as well as Guilt, Object Loss, Sexual Guilt, and Obligation (recurring throughout these plays). It is advanced that Williams’ plays posses an honest and insightful understanding of human relations and, as such, are of contemporary value. This Thesis is not only an academic study, but also has practical applications for dramatists. With an increased understanding of the intrinsic tensions and motivations within such plays, offered by such psychoanalytic strategy, performance and staging of such work may be enhanced valuably.
- Full Text:
- Date Issued: 2003
- Authors: Tosio, Paul
- Date: 2003
- Subjects: Williams, Tennessee, 1911-1983 Williams, Tennessee, 1911-1983 -- Knowledge -- Psychology Object relations (Psychoanalysis) Psychoanalysis Drama -- Psychological aspects
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2150 , http://hdl.handle.net/10962/d1002382
- Description: Tennessee Williams is a playwright of great psychological depth. This thesis probes some of the complexities of his work through the use of Object Relational Psychoanalysis, specifically employing the theories of Melanie Klein, W.R.D. Fairbairn and Donald Winnicott. The Glass Menagerie, A Streetcar Named Desire, Cat On A Hot Tin Roof and The Night of The Iguana are analysed from this theoretical stance. All of these plays display great perceptiveness into the human condition, accurately portraying many psychological relational themes. Certain Object Relational themes become very apparent in these analyses. These themes include, Dependency (especially in The Glass Menagerie), Reparation (particularly in A Streetcar Named Desire), Falsehood (notably in Cat on a Hot Tin Roof), Idealisation (evident in The Night of The Iguana), Honest Empathetic Relations (apparent in Cat on a Hot Tin Roof and The Night of The Iguana) as well as Guilt, Object Loss, Sexual Guilt, and Obligation (recurring throughout these plays). It is advanced that Williams’ plays posses an honest and insightful understanding of human relations and, as such, are of contemporary value. This Thesis is not only an academic study, but also has practical applications for dramatists. With an increased understanding of the intrinsic tensions and motivations within such plays, offered by such psychoanalytic strategy, performance and staging of such work may be enhanced valuably.
- Full Text:
- Date Issued: 2003
Analysis of material flow around a retractable pin in a friction stir weld
- Authors: Georgeou, Zacharias
- Date: 2003
- Subjects: Friction welding , Aluminum alloys -- Welding
- Language: English
- Type: Thesis , Masters , MTech (Mechanical Engineering)
- Identifier: vital:10812 , http://hdl.handle.net/10948/196 , Friction welding , Aluminum alloys -- Welding
- Description: Friction StirWelding (FSW) has been researched for a number of years since its inception in 1991. The work thus far has been based on understanding the material and thermal flow using the standard fixed pin tool. The keyhole resulting during tool extraction in a FSW weld, is a disadvantage and a current limiting factor. Eliminating this effect from a weld using a movable pin tools would make FSW more commercially viable. This dissertation focuses on the design of a novel retractable pin tool, and highlights the problems encountered during the welding of Aluminum plates, Al2024 and Al5083. Previously studied techniques of material and thermal flow were used, to investigate the effect of the tool during extraction in a FSW weld. A prototype retractable tool was designed using parametric and axiomatic design theory, and implementing a pneumatic muscle actuation system. The resulting problems in the calibration of the retractable pin tool and the resulting welds are presented, these results confirming previous studies. The movable pin produced discrepancies the heat generation around the shoulder during a FSW weld. The failure of this tool to produce a reasonable weld showed that previous ideas into the workings of a retractable pin tool requires further investigation, furthermore a fresh approach to the interpretation and understanding of the FSW weld process needs consideration.
- Full Text:
- Date Issued: 2003
- Authors: Georgeou, Zacharias
- Date: 2003
- Subjects: Friction welding , Aluminum alloys -- Welding
- Language: English
- Type: Thesis , Masters , MTech (Mechanical Engineering)
- Identifier: vital:10812 , http://hdl.handle.net/10948/196 , Friction welding , Aluminum alloys -- Welding
- Description: Friction StirWelding (FSW) has been researched for a number of years since its inception in 1991. The work thus far has been based on understanding the material and thermal flow using the standard fixed pin tool. The keyhole resulting during tool extraction in a FSW weld, is a disadvantage and a current limiting factor. Eliminating this effect from a weld using a movable pin tools would make FSW more commercially viable. This dissertation focuses on the design of a novel retractable pin tool, and highlights the problems encountered during the welding of Aluminum plates, Al2024 and Al5083. Previously studied techniques of material and thermal flow were used, to investigate the effect of the tool during extraction in a FSW weld. A prototype retractable tool was designed using parametric and axiomatic design theory, and implementing a pneumatic muscle actuation system. The resulting problems in the calibration of the retractable pin tool and the resulting welds are presented, these results confirming previous studies. The movable pin produced discrepancies the heat generation around the shoulder during a FSW weld. The failure of this tool to produce a reasonable weld showed that previous ideas into the workings of a retractable pin tool requires further investigation, furthermore a fresh approach to the interpretation and understanding of the FSW weld process needs consideration.
- Full Text:
- Date Issued: 2003
Apollo, Dionysus, dialectical reason and critical cinema
- Authors: Konik, Adrian
- Date: 2003
- Subjects: Motion pictures and language , Philosophy in motion pictures , Dionysus (Greek deity) in literature , Apollo (Greek deity) in literature
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:10990 , http://hdl.handle.net/10948/295 , Motion pictures and language , Philosophy in motion pictures , Dionysus (Greek deity) in literature , Apollo (Greek deity) in literature
- Description: The contemporary era is dominated by an Apollonian visual language, i.e. the visual language of mainstream cinema and the mass media, and this study concerns the role that critical cinema, as Dionysian subverter, plays under such conditions. I argue that critical cinema should not be viewed as something completely ‘new’ but rather as a new, or at least the latest, manifestation of an older subversive ‘Dionysian’ voice that has made its presence felt since the dawn of the hegemony of an Apollonian disposition in Homeric epic. (I maintain that the history of western culture can be understood in terms of the persistent tension between Apollonian and Dionysian dispositions, and I use the distinction Derrida makes in Différance, between restricted and general economies, to distinguish between them, respectively.) I begin by considering the Dionysian echoes within Homer’s Iliad and then consider the way in which they became a ‘roar’ in the tragedies of Aeschylus. After Aeschylus a predominantly Apollonian voice asserted itself once again (to various degrees) through the work of Sophocles and Euripides. This was in keeping with the trend towards a more (Apollonian) restricted economy that is reflected in the writings of Homer’s literary successors, and which reached a crucial stage in Plato’s valorisation of ‘dialectics’, or what I term ‘dialecticis m’, which saw the birth of ‘dialectical language’. Through Plato dialecticism, or dialectical language, became instantiated as the ‘language’ of western philosophy and this predisposed western culture to develop along predominantly Apollonian lines. This continued from Plato, through the Middle Ages, until in the 17th century this Apollonian trend became manifest in the concept of the stable, integral, autonomous and self -transparent Cartesian ego, which is inextricably linked to dialectical language that promises certainty of ‘truth’ and maintains the possibility of representing the world in its entirety (as a system). In the contemporary ‘age of a world picture’, the hegemonic (Apollonian) visual language of mainstream cinema and the mass media propagates and perpetuates the belief in the possibility of representing the world in its entirety through the image, and insofar as it caters to audiences’ needs for stability and certainty (of ‘truth’) through providing such ‘complete’ representations, shapes their subjectivity along the lines of the Cartesian ego. According to Baudrillard, in contemporary society and culture the hyperreal realm of visual language has become far more significant for individuals than their immediate, empirical experiences, and that, as a result, they are far less predisposed to discussion and reflection and far more prone to passive ‘watching’. Also, Adorno maintains that it is impossible to have a form of critical cinema because of the way in which features inherent to cinema predispose it towards being an ideological apparatus. However, if both Baudrillard and Adorno are correct then the future appears increasingly bleak as it involves nothing other than the continuation and propagation of the hegemony of the visual language of mainstream cinema and the mass media, with no possibility for critical resistance. I argue instead that critical cinema is possible because the move towards a more restricted economy, motivated by an Apollonian disposition, did not develop from Homer to the contemporary era without meeting Dionysian resistance. I trace the presence of a subversive Dionysian voice through Homer’s Iliad, through Aeschylus’ Prometheus Bound, and through Plato’s Dialogues, where it echoes in the sentiments of some of Plato’s interlocutors, such as Callicles. In addition, I maintain that a ‘Dionysian’ voice resonates through both Nietzsche’s and Heidegger’s respective criticisms of ‘dialectical language’ and the ‘validity’ of the Cartesian ego. I argue that critical cinema, particularly Aronofsky’s postmodern critical cinema, parallels their similar epistemological and ontological perspectives in the way in which it engages with the (Apollonian) visual language of mainstream cinema and the mass media, and thereby, potentially, facilitates a more porous and protean subjectivity.
- Full Text:
- Date Issued: 2003
- Authors: Konik, Adrian
- Date: 2003
- Subjects: Motion pictures and language , Philosophy in motion pictures , Dionysus (Greek deity) in literature , Apollo (Greek deity) in literature
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:10990 , http://hdl.handle.net/10948/295 , Motion pictures and language , Philosophy in motion pictures , Dionysus (Greek deity) in literature , Apollo (Greek deity) in literature
- Description: The contemporary era is dominated by an Apollonian visual language, i.e. the visual language of mainstream cinema and the mass media, and this study concerns the role that critical cinema, as Dionysian subverter, plays under such conditions. I argue that critical cinema should not be viewed as something completely ‘new’ but rather as a new, or at least the latest, manifestation of an older subversive ‘Dionysian’ voice that has made its presence felt since the dawn of the hegemony of an Apollonian disposition in Homeric epic. (I maintain that the history of western culture can be understood in terms of the persistent tension between Apollonian and Dionysian dispositions, and I use the distinction Derrida makes in Différance, between restricted and general economies, to distinguish between them, respectively.) I begin by considering the Dionysian echoes within Homer’s Iliad and then consider the way in which they became a ‘roar’ in the tragedies of Aeschylus. After Aeschylus a predominantly Apollonian voice asserted itself once again (to various degrees) through the work of Sophocles and Euripides. This was in keeping with the trend towards a more (Apollonian) restricted economy that is reflected in the writings of Homer’s literary successors, and which reached a crucial stage in Plato’s valorisation of ‘dialectics’, or what I term ‘dialecticis m’, which saw the birth of ‘dialectical language’. Through Plato dialecticism, or dialectical language, became instantiated as the ‘language’ of western philosophy and this predisposed western culture to develop along predominantly Apollonian lines. This continued from Plato, through the Middle Ages, until in the 17th century this Apollonian trend became manifest in the concept of the stable, integral, autonomous and self -transparent Cartesian ego, which is inextricably linked to dialectical language that promises certainty of ‘truth’ and maintains the possibility of representing the world in its entirety (as a system). In the contemporary ‘age of a world picture’, the hegemonic (Apollonian) visual language of mainstream cinema and the mass media propagates and perpetuates the belief in the possibility of representing the world in its entirety through the image, and insofar as it caters to audiences’ needs for stability and certainty (of ‘truth’) through providing such ‘complete’ representations, shapes their subjectivity along the lines of the Cartesian ego. According to Baudrillard, in contemporary society and culture the hyperreal realm of visual language has become far more significant for individuals than their immediate, empirical experiences, and that, as a result, they are far less predisposed to discussion and reflection and far more prone to passive ‘watching’. Also, Adorno maintains that it is impossible to have a form of critical cinema because of the way in which features inherent to cinema predispose it towards being an ideological apparatus. However, if both Baudrillard and Adorno are correct then the future appears increasingly bleak as it involves nothing other than the continuation and propagation of the hegemony of the visual language of mainstream cinema and the mass media, with no possibility for critical resistance. I argue instead that critical cinema is possible because the move towards a more restricted economy, motivated by an Apollonian disposition, did not develop from Homer to the contemporary era without meeting Dionysian resistance. I trace the presence of a subversive Dionysian voice through Homer’s Iliad, through Aeschylus’ Prometheus Bound, and through Plato’s Dialogues, where it echoes in the sentiments of some of Plato’s interlocutors, such as Callicles. In addition, I maintain that a ‘Dionysian’ voice resonates through both Nietzsche’s and Heidegger’s respective criticisms of ‘dialectical language’ and the ‘validity’ of the Cartesian ego. I argue that critical cinema, particularly Aronofsky’s postmodern critical cinema, parallels their similar epistemological and ontological perspectives in the way in which it engages with the (Apollonian) visual language of mainstream cinema and the mass media, and thereby, potentially, facilitates a more porous and protean subjectivity.
- Full Text:
- Date Issued: 2003
Applied studies of some Southern African blowflies (Diptera: Calliphoridae) of forensic importance
- Authors: Lunt, Nicola
- Date: 2003
- Subjects: Diptera -- South Africa , Blowflies -- South Africa , Forensic entomology
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5803 , http://hdl.handle.net/10962/d1006202 , Diptera -- South Africa , Blowflies -- South Africa , Forensic entomology
- Description: Three major aspects of blowfly (Diptera: Calliphoridae) research were the focus of this study. Firstly, the phylogenetic relationships of 40 oestroid species from a variety of geographical localities were investigated using Cytochrome Oxidase b subunit I (COl) gene sequences. Maximum parsimony (MP) and Jukes-Cantor neighbor-joining (NJ) analyses both extracted a paraphyletic Calliphoridae, with the Calliphorinae-Luciliinae clade being sister to the Sarcophagidae. Short branch lengths within Chrysomya indicate a recent rapid radiation of this genus. Phormia and Protophormia either formed a sister clade to Chrysomya, or were embedded in this genus. Tree topologies were comparable between MP and NJ trees, but the positions of some genera were ambiguous. Secondly, developmental parameters and behaviour were investigated for four southern African species of forensically important blowflies viz. Chrysomya chloropyga, C. putoria, C. megacephala and Lucilia sericata, and ad hoc observations were made for Calliphora croceipalpis, Chrysomya marginalis and the predatory C. albiceps. Choice of oviposition substrate differed between species, mirroring substrate preferences in the field. Sexual dimorphism and dwarfism within a cohort complicated ageing maggots using size, but the use of developmental events (e.g. ecdysis) allowed ages to be determined unambiguously. Separate species status was supported for the previously synonymised C. chloropyga and C. putoria, by differences in maggot behaviour, larval growth rates and temperature optima. The proportion of total development time assigned to each larval instar and pupariation was variable among temperatures, but similar between congeneric species. Thirdly, since a negative linear relationship was found to occur between the developmental constant (K) and developmental zero (D₀) for both Calliphoridae and Sarcophagidae, the potential for predicting physiological parameters of unstudied taxa was investigated. Species and genera of Palaearctic origin generally had high K's and low D₀'s, and the reverse was true for the tropical taxa. It was found that both K and D₀ can be estimated for "unknown" taxa using the Felsenstein's Independent Contrasts (FIC) method of PDTree (Garland et al. 200 I), provided that branch lengths are relatively short and the phylogenetic position of the estimated taxon is unambiguous.
- Full Text:
- Date Issued: 2003
- Authors: Lunt, Nicola
- Date: 2003
- Subjects: Diptera -- South Africa , Blowflies -- South Africa , Forensic entomology
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5803 , http://hdl.handle.net/10962/d1006202 , Diptera -- South Africa , Blowflies -- South Africa , Forensic entomology
- Description: Three major aspects of blowfly (Diptera: Calliphoridae) research were the focus of this study. Firstly, the phylogenetic relationships of 40 oestroid species from a variety of geographical localities were investigated using Cytochrome Oxidase b subunit I (COl) gene sequences. Maximum parsimony (MP) and Jukes-Cantor neighbor-joining (NJ) analyses both extracted a paraphyletic Calliphoridae, with the Calliphorinae-Luciliinae clade being sister to the Sarcophagidae. Short branch lengths within Chrysomya indicate a recent rapid radiation of this genus. Phormia and Protophormia either formed a sister clade to Chrysomya, or were embedded in this genus. Tree topologies were comparable between MP and NJ trees, but the positions of some genera were ambiguous. Secondly, developmental parameters and behaviour were investigated for four southern African species of forensically important blowflies viz. Chrysomya chloropyga, C. putoria, C. megacephala and Lucilia sericata, and ad hoc observations were made for Calliphora croceipalpis, Chrysomya marginalis and the predatory C. albiceps. Choice of oviposition substrate differed between species, mirroring substrate preferences in the field. Sexual dimorphism and dwarfism within a cohort complicated ageing maggots using size, but the use of developmental events (e.g. ecdysis) allowed ages to be determined unambiguously. Separate species status was supported for the previously synonymised C. chloropyga and C. putoria, by differences in maggot behaviour, larval growth rates and temperature optima. The proportion of total development time assigned to each larval instar and pupariation was variable among temperatures, but similar between congeneric species. Thirdly, since a negative linear relationship was found to occur between the developmental constant (K) and developmental zero (D₀) for both Calliphoridae and Sarcophagidae, the potential for predicting physiological parameters of unstudied taxa was investigated. Species and genera of Palaearctic origin generally had high K's and low D₀'s, and the reverse was true for the tropical taxa. It was found that both K and D₀ can be estimated for "unknown" taxa using the Felsenstein's Independent Contrasts (FIC) method of PDTree (Garland et al. 200 I), provided that branch lengths are relatively short and the phylogenetic position of the estimated taxon is unambiguous.
- Full Text:
- Date Issued: 2003
Aspekte van die prosa van André P Brink met spesifieke verwysing na Sandkastele (1995)
- Authors: Vermeulen, Liezel
- Date: 2003
- Subjects: Brink, André P (André Philippus), 1935-2015 -- Sandkastele Brink, André P (André Philippus), 1935-2015
- Language: Afrikaans
- Type: Thesis , Masters , MA
- Identifier: vital:3605 , http://hdl.handle.net/10962/d1003809
- Description: Hierdie studie ondersoek aspekte van die prosa-oeuvre van die Suid-Afrikaanse outeur André P. Brink, met spesifieke verwysing na sy eerste post-apartheid roman Sandkastele (1995). Hierdie teks se feministiese hersiening van en alternatief tot die manlikgedomineerde en -gedokumenteerde amptelike geskiedenis van Suider-Afrika staan sentraal in die postmodernistiese, postkoloniale fase waarin die Brink prosa-oeuvre die verlede heroorweeg. Die pre-koloniale en koloniale verlede van die landstreek word herkaart deur die vertelling van stories van vroue van die verlede in 'n unieke vertelsituasie wat 'n her-verbeelde, tekstuele vrouegeskiedenis registreer. Die konsep "reimagination" wat ontwikkel in Brink se kritiese en literêr-teoretiese werke vanaf die publikasie van die essay "Imagining the real" in Mapmakers (1983) en Elleke Boehmer se konseptualisering van die tekstuele gevolge van dekolonisasie (1995) word ontgin. Spore van die magiese realisme, die postkolonialisme, die poststrukturalistiese postmodernisme en leeswyses en denkrigtings wat in die feminisme en genderstudies aandag geniet, word in Sandkastele se vertelling, narratiewe figure en ruimte ondersoek. Hierdie leesstrategie akkommodeer die Brink-oeuvre se voortdurende heroorweging en ontdekking van nuwe tekstuele moontlikhede, 'n proses wat gekenmerk word deur 'n reeks tematiese of konseptuele ontwikkelinge en die uit-en deurwerk van belangstellings van vorige Brinktekste. ABSTRACT: This study investigates aspects of the prose oeuvre of the South African author André P. Brink, with specific reference to his first post-apartheid novel Imaginings of Sand (1995). The feminist revisioning of the text as an alternative to the male-dominated and -documented official history of Southern Africa is central to the postmodernist, postcolonial phase of the Brink oeuvre in which the past is reconsidered. The pre-colonial and colonial past of the country is remapped through the stories of women of the past in a narrative construction which registers a re-imagined textual women's history. The concept "reimagination" which develops in Brink's critical and literary theoretical works from the publication of the essay "Imagining the real" in Mapmakers (1983) and Elleke Boehmer's conceptualisation of the textual effects of decolonisation (1995) is utilised. Traces of the magical realism, postcolonialism, poststructuralist postmodernism and approaches which are explored in feminism and gender studies are explored in Sandkastele's narrative construction, characters and space. This reading strategy accommodates the Brink oeuvre's continual re-evaluation and uncovering of new textual possibilities, a process that is characterised by a series of thematic or conceptual developments and the deployment of themes from previous Brink prose texts.
- Full Text:
- Date Issued: 2003
- Authors: Vermeulen, Liezel
- Date: 2003
- Subjects: Brink, André P (André Philippus), 1935-2015 -- Sandkastele Brink, André P (André Philippus), 1935-2015
- Language: Afrikaans
- Type: Thesis , Masters , MA
- Identifier: vital:3605 , http://hdl.handle.net/10962/d1003809
- Description: Hierdie studie ondersoek aspekte van die prosa-oeuvre van die Suid-Afrikaanse outeur André P. Brink, met spesifieke verwysing na sy eerste post-apartheid roman Sandkastele (1995). Hierdie teks se feministiese hersiening van en alternatief tot die manlikgedomineerde en -gedokumenteerde amptelike geskiedenis van Suider-Afrika staan sentraal in die postmodernistiese, postkoloniale fase waarin die Brink prosa-oeuvre die verlede heroorweeg. Die pre-koloniale en koloniale verlede van die landstreek word herkaart deur die vertelling van stories van vroue van die verlede in 'n unieke vertelsituasie wat 'n her-verbeelde, tekstuele vrouegeskiedenis registreer. Die konsep "reimagination" wat ontwikkel in Brink se kritiese en literêr-teoretiese werke vanaf die publikasie van die essay "Imagining the real" in Mapmakers (1983) en Elleke Boehmer se konseptualisering van die tekstuele gevolge van dekolonisasie (1995) word ontgin. Spore van die magiese realisme, die postkolonialisme, die poststrukturalistiese postmodernisme en leeswyses en denkrigtings wat in die feminisme en genderstudies aandag geniet, word in Sandkastele se vertelling, narratiewe figure en ruimte ondersoek. Hierdie leesstrategie akkommodeer die Brink-oeuvre se voortdurende heroorweging en ontdekking van nuwe tekstuele moontlikhede, 'n proses wat gekenmerk word deur 'n reeks tematiese of konseptuele ontwikkelinge en die uit-en deurwerk van belangstellings van vorige Brinktekste. ABSTRACT: This study investigates aspects of the prose oeuvre of the South African author André P. Brink, with specific reference to his first post-apartheid novel Imaginings of Sand (1995). The feminist revisioning of the text as an alternative to the male-dominated and -documented official history of Southern Africa is central to the postmodernist, postcolonial phase of the Brink oeuvre in which the past is reconsidered. The pre-colonial and colonial past of the country is remapped through the stories of women of the past in a narrative construction which registers a re-imagined textual women's history. The concept "reimagination" which develops in Brink's critical and literary theoretical works from the publication of the essay "Imagining the real" in Mapmakers (1983) and Elleke Boehmer's conceptualisation of the textual effects of decolonisation (1995) is utilised. Traces of the magical realism, postcolonialism, poststructuralist postmodernism and approaches which are explored in feminism and gender studies are explored in Sandkastele's narrative construction, characters and space. This reading strategy accommodates the Brink oeuvre's continual re-evaluation and uncovering of new textual possibilities, a process that is characterised by a series of thematic or conceptual developments and the deployment of themes from previous Brink prose texts.
- Full Text:
- Date Issued: 2003
Bioaccumulation and histopathology of copper in Oreochromis mossambicus
- Authors: Naigaga, Irene
- Date: 2003
- Subjects: Mozambique tilapia , Copper , Marine toxins , Fishes -- Effect of water pollution on , Water -- Pollution -- Environmental aspects
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5234 , http://hdl.handle.net/10962/d1005077 , Mozambique tilapia , Copper , Marine toxins , Fishes -- Effect of water pollution on , Water -- Pollution -- Environmental aspects
- Description: Cu is one of the most toxic elements that affect fish populations when the fish are exposed to concentrations exceeding their tolerance. To investigate the effects of elementary Cu on aspects of bioconcentration, histology and behaviour, O. mossambicus were exposed to 0 and 0.75 ± 0.20 mg/l of Cu for 96 hours (short-term study), and 0, 0.11 ± 0.02, 0.29 ± 0.02, and 0.47 ± 0.04 mg/l of Cu for 64 days (longterm study) under controlled conditions in the laboratory. For the long-term study fish were sampled for gills, liver, and kidney Cu accumulation analysis after 1, 32 and 64 days of exposure and after 1, 2, 4, 16, 32, and 64 days for gills, liver and spleen histology analysis. Cu accumulation was concentration-duration dependent with the highest accumulation capacity in the liver. A multifactor linear model was developed for the relationship between exposure dose, exposure duration and Cu accumulation in the organs with the liver model: Log L = 3.35 + 0.85W + 0.31T (r² = 0.892) giving a better fit than the gills: G = −35.09 + 10.58W + 17.58T (r² = 0.632). Where L = Cu accumulation values in the liver, G = Cu accumulation values in the gills (both in μg/g dry mass); W = exposure dose in water (mg/l); and T = exposure time (days). Using this model Cu accumulation in organs can be estimated when exposure concentration and duration is known. This model should be tested under different conditions to determine the potential of the model in monitoring Cu toxicity in the environment. Lesions were observed in the liver, gills and spleen in all Cu treatments at all exposure concentration and exposure durations. However, the incidence and the degree of alteration was related to the concentration of Cu and duration of exposure. The sequential appearance of lesions in the order of, hepatic vacuolar degeneration, fatty degeneration and necrosis indicated a gradual increase in liver damage with larger duration of exposure time and increasing Cu concentration. The initial lesions in the gills were manifested as hypertrophy and hyperplasia of the gill epithelium causing increase in the thickness of the secondary lamellae, mucous cell hypertrophy and proliferation, mucous hypersecretion, proliferation of eosinophilic granule cells and hyperplasia of interlamellar cells. With increase in exposure time, necrosis of the eosinophilic granule cells, lamellar oedema, epithelial desquamation and increase in severity of lamellar hyperplasia were observed. These lesions indicated an initial defence mechanism of the fish against Cu toxicity followed by advanced histological changes that were related to Cu concentration and duration of exposure. Changes in the spleen were haemosiderosis, increase in the white pulp and macrophage centres, reduction in the red pulp, and necrosis suggesting that fish exposed to environmentally relevant levels of Cu may be histopathologically altered leading to anaemia and immunosuppression. Regression analysis was used to quantify the relationship between the total activity of the fish, and duration of exposure. There was a gradual decline in fish activity related to Cu concentration and duration of exposure before introducing food into the tanks. There was a constant activity after introducing food in the tanks at the control and 0.11 ± 0.02 mg/l Cu exposure levels irrespective of exposure time. Analysis of covariance (ANCOVA) was used to test for the difference in slopes between treatments. There was no significant difference (p > 0.05) between slopes of the control and 0.11 ± 0.02 mg/l Cu, and between 0.29 ± 0.02 and 47 ± 0.04 mg/l Cu before and after introducing food in the tanks. The slopes of both the control and 0.11 ± 0.02 mg/l Cu were significantly different from those of 0.29 ± 0.02 and 0.47 ± 0.04 mg/l Cu (p < 0.05). There were significant differences in the mean opercular movements per minute between treatments (p < 0.05). There was hyperventilation at 0.11 ± 0.02 mg/l Cu i.e. 87 ± 18 opercular movements per minute (mean ± standard deviation) and hypoventilation at 0.29 ± 0.02 and 0.47 ± 0.04 mg/l Cu i.e. 37 ± 34 and 13 ± 6 opercular movements per minute compared to the control. Hypo- and hyperventilation were related to the lesser and greater gill damage, respectively. In conclusion Cu accumulation and effects on histology of the liver, gills and were related to the concentration of Cu in the water and duration of exposure showing a gradual increase in incidence and intensity with larger duration of exposure time and increasing Cu concentration. The fish were initially able to homeostatically regulate and detoxify Cu. However, as the exposure continued, the homeostatic mechanism appears to have failed to cope with the increasing metal burden causing advanced histological changes.
- Full Text:
- Date Issued: 2003
- Authors: Naigaga, Irene
- Date: 2003
- Subjects: Mozambique tilapia , Copper , Marine toxins , Fishes -- Effect of water pollution on , Water -- Pollution -- Environmental aspects
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5234 , http://hdl.handle.net/10962/d1005077 , Mozambique tilapia , Copper , Marine toxins , Fishes -- Effect of water pollution on , Water -- Pollution -- Environmental aspects
- Description: Cu is one of the most toxic elements that affect fish populations when the fish are exposed to concentrations exceeding their tolerance. To investigate the effects of elementary Cu on aspects of bioconcentration, histology and behaviour, O. mossambicus were exposed to 0 and 0.75 ± 0.20 mg/l of Cu for 96 hours (short-term study), and 0, 0.11 ± 0.02, 0.29 ± 0.02, and 0.47 ± 0.04 mg/l of Cu for 64 days (longterm study) under controlled conditions in the laboratory. For the long-term study fish were sampled for gills, liver, and kidney Cu accumulation analysis after 1, 32 and 64 days of exposure and after 1, 2, 4, 16, 32, and 64 days for gills, liver and spleen histology analysis. Cu accumulation was concentration-duration dependent with the highest accumulation capacity in the liver. A multifactor linear model was developed for the relationship between exposure dose, exposure duration and Cu accumulation in the organs with the liver model: Log L = 3.35 + 0.85W + 0.31T (r² = 0.892) giving a better fit than the gills: G = −35.09 + 10.58W + 17.58T (r² = 0.632). Where L = Cu accumulation values in the liver, G = Cu accumulation values in the gills (both in μg/g dry mass); W = exposure dose in water (mg/l); and T = exposure time (days). Using this model Cu accumulation in organs can be estimated when exposure concentration and duration is known. This model should be tested under different conditions to determine the potential of the model in monitoring Cu toxicity in the environment. Lesions were observed in the liver, gills and spleen in all Cu treatments at all exposure concentration and exposure durations. However, the incidence and the degree of alteration was related to the concentration of Cu and duration of exposure. The sequential appearance of lesions in the order of, hepatic vacuolar degeneration, fatty degeneration and necrosis indicated a gradual increase in liver damage with larger duration of exposure time and increasing Cu concentration. The initial lesions in the gills were manifested as hypertrophy and hyperplasia of the gill epithelium causing increase in the thickness of the secondary lamellae, mucous cell hypertrophy and proliferation, mucous hypersecretion, proliferation of eosinophilic granule cells and hyperplasia of interlamellar cells. With increase in exposure time, necrosis of the eosinophilic granule cells, lamellar oedema, epithelial desquamation and increase in severity of lamellar hyperplasia were observed. These lesions indicated an initial defence mechanism of the fish against Cu toxicity followed by advanced histological changes that were related to Cu concentration and duration of exposure. Changes in the spleen were haemosiderosis, increase in the white pulp and macrophage centres, reduction in the red pulp, and necrosis suggesting that fish exposed to environmentally relevant levels of Cu may be histopathologically altered leading to anaemia and immunosuppression. Regression analysis was used to quantify the relationship between the total activity of the fish, and duration of exposure. There was a gradual decline in fish activity related to Cu concentration and duration of exposure before introducing food into the tanks. There was a constant activity after introducing food in the tanks at the control and 0.11 ± 0.02 mg/l Cu exposure levels irrespective of exposure time. Analysis of covariance (ANCOVA) was used to test for the difference in slopes between treatments. There was no significant difference (p > 0.05) between slopes of the control and 0.11 ± 0.02 mg/l Cu, and between 0.29 ± 0.02 and 47 ± 0.04 mg/l Cu before and after introducing food in the tanks. The slopes of both the control and 0.11 ± 0.02 mg/l Cu were significantly different from those of 0.29 ± 0.02 and 0.47 ± 0.04 mg/l Cu (p < 0.05). There were significant differences in the mean opercular movements per minute between treatments (p < 0.05). There was hyperventilation at 0.11 ± 0.02 mg/l Cu i.e. 87 ± 18 opercular movements per minute (mean ± standard deviation) and hypoventilation at 0.29 ± 0.02 and 0.47 ± 0.04 mg/l Cu i.e. 37 ± 34 and 13 ± 6 opercular movements per minute compared to the control. Hypo- and hyperventilation were related to the lesser and greater gill damage, respectively. In conclusion Cu accumulation and effects on histology of the liver, gills and were related to the concentration of Cu in the water and duration of exposure showing a gradual increase in incidence and intensity with larger duration of exposure time and increasing Cu concentration. The fish were initially able to homeostatically regulate and detoxify Cu. However, as the exposure continued, the homeostatic mechanism appears to have failed to cope with the increasing metal burden causing advanced histological changes.
- Full Text:
- Date Issued: 2003
Biology and demography of the spotted grunter Pomadasys commersonnii (Haemulidae) in South African waters
- Authors: Webb, Garth Anthony
- Date: 2003
- Subjects: Grunts (Fishes) -- South Africa , Grunts (Fishes) -- South Africa -- Ecology
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5201 , http://hdl.handle.net/10962/d1003727 , Grunts (Fishes) -- South Africa , Grunts (Fishes) -- South Africa -- Ecology
- Description: The spotted grunter, Pomadasys commersonnii (Haemulidae), is an Indian Ocean coastal species, extending from India to False Bay but is absent from the central Indian Ocean islands. Its taste and texture has made it one of the most important line fish species and is caught by recreational and subsistence fisherman along the entire east coast of South Africa. Because of its inshore distribution, reduced catch rates and estuarine dependence the species was de-commercialised in 1992. Since then it has been investigated as a candidate species for mariculture. All previous work on the biology of the species was undertaken on fish collected in KwaZulu-Natal in the mid 1970's. All other information has been incidental and formed part of other ecological studies. All management plans for this species have been based on these data. To develop a more comprehensive management plan that incorporates the entire population of spotted grunter, it was deemed necessary to reassess the biology (including feeding biology, age and growth and reproductive biology) as well as the demography of the population throughout its distributional range in South African waters. Analysis of the diet of spotted grunter, collected in estuaries, indicates that crustaceans form the bulk of the prey selected. Amphipods, mysids and estuarine brachyura predominate the diet of fish < 300 mm TL. At 200 mm TL fish start to prey on anomurans, which are extracted from their burrows using the 'blowing' feeding mechanism. Anomurans, in particular Upogebia africana and Callianassa krausii, become the preferred prey of fish larger than 300 mm TL. The high degree of diet flexibility that spotted grunter exhibit means that the composition and abundance of the macrobenthos of a particular environment will dictate the diet of the species. Otolith growth zones were found to be deposited annually with the opaque zones being deposited during the austral summer (November - February). The optical definition of annual otolith growth rings differed significantly between geographic regions (namely: Western Cape, South Eastern Cape and KwaZulu-Natal). Growth (sex combined) offish in the Western Cape were best described by the specialised 3 parameter Von Bertalanffy with a relative error structure in the form : Lt = 753(1- e⁻°·¹⁵⁴ ⁽t +¹·⁶¹⁵⁾) while growth in the South Eastern Cape was best described by using the Schnute model with an absolute error structure in the form: Lt=177°·⁴¹⁶ + (676.2⁻¹·²⁶⁶ - 169.2⁻¹²⁶⁶)[1-e°·⁴¹⁶⁽t-t₁⁾ / 1-e°·⁴¹⁶⁽t₂-t₁⁾]¹/¹·²⁶⁶ whereas growth was best described in KwaZulu-Natal using the specialised 3 parameter Von Bertalanffy with a relative error structure in the form: Lt = 839(1-e°·¹⁷⁽t⁺°·⁴⁹⁾) In the South Eastern Cape, length at 50% maturity was found to be 305 mm TL for males. Since females with ripe & running or spent gonads were not found in the South Eastern Cape and since histological evidence suggests that females in the South Eastern Cape have spawned, it appears that spawning does not occur in the South Eastern Cape. These results suggest that adults are resident in the estuaries of the Western and South Eastern Cape and undertake the spring/summer, northward spawning migration to KwaZulu-Natal. After joining the resident spawner stock in KwaZulu-Natal and spawning in the offshore environment of KwaZulu-Natal, adults soon return to the southern regions of their distributional range. Juveniles recruit into KwaZulu-Natal estuaries at a length of 25 - 35 mm TL. A proportion of the eggs and larvae are transported southwards along the periphery of the western boundary Agulhas Current where juveniles (25 - 30 mm TL) recruit into the estuaries as far south as the Swartvlei estuary in the Western Cape. There is evidence to suggest that the fish, which occur in the Western Cape estuaries, have migrated there once they have attained sexual maturity further east.
- Full Text:
- Date Issued: 2003
- Authors: Webb, Garth Anthony
- Date: 2003
- Subjects: Grunts (Fishes) -- South Africa , Grunts (Fishes) -- South Africa -- Ecology
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5201 , http://hdl.handle.net/10962/d1003727 , Grunts (Fishes) -- South Africa , Grunts (Fishes) -- South Africa -- Ecology
- Description: The spotted grunter, Pomadasys commersonnii (Haemulidae), is an Indian Ocean coastal species, extending from India to False Bay but is absent from the central Indian Ocean islands. Its taste and texture has made it one of the most important line fish species and is caught by recreational and subsistence fisherman along the entire east coast of South Africa. Because of its inshore distribution, reduced catch rates and estuarine dependence the species was de-commercialised in 1992. Since then it has been investigated as a candidate species for mariculture. All previous work on the biology of the species was undertaken on fish collected in KwaZulu-Natal in the mid 1970's. All other information has been incidental and formed part of other ecological studies. All management plans for this species have been based on these data. To develop a more comprehensive management plan that incorporates the entire population of spotted grunter, it was deemed necessary to reassess the biology (including feeding biology, age and growth and reproductive biology) as well as the demography of the population throughout its distributional range in South African waters. Analysis of the diet of spotted grunter, collected in estuaries, indicates that crustaceans form the bulk of the prey selected. Amphipods, mysids and estuarine brachyura predominate the diet of fish < 300 mm TL. At 200 mm TL fish start to prey on anomurans, which are extracted from their burrows using the 'blowing' feeding mechanism. Anomurans, in particular Upogebia africana and Callianassa krausii, become the preferred prey of fish larger than 300 mm TL. The high degree of diet flexibility that spotted grunter exhibit means that the composition and abundance of the macrobenthos of a particular environment will dictate the diet of the species. Otolith growth zones were found to be deposited annually with the opaque zones being deposited during the austral summer (November - February). The optical definition of annual otolith growth rings differed significantly between geographic regions (namely: Western Cape, South Eastern Cape and KwaZulu-Natal). Growth (sex combined) offish in the Western Cape were best described by the specialised 3 parameter Von Bertalanffy with a relative error structure in the form : Lt = 753(1- e⁻°·¹⁵⁴ ⁽t +¹·⁶¹⁵⁾) while growth in the South Eastern Cape was best described by using the Schnute model with an absolute error structure in the form: Lt=177°·⁴¹⁶ + (676.2⁻¹·²⁶⁶ - 169.2⁻¹²⁶⁶)[1-e°·⁴¹⁶⁽t-t₁⁾ / 1-e°·⁴¹⁶⁽t₂-t₁⁾]¹/¹·²⁶⁶ whereas growth was best described in KwaZulu-Natal using the specialised 3 parameter Von Bertalanffy with a relative error structure in the form: Lt = 839(1-e°·¹⁷⁽t⁺°·⁴⁹⁾) In the South Eastern Cape, length at 50% maturity was found to be 305 mm TL for males. Since females with ripe & running or spent gonads were not found in the South Eastern Cape and since histological evidence suggests that females in the South Eastern Cape have spawned, it appears that spawning does not occur in the South Eastern Cape. These results suggest that adults are resident in the estuaries of the Western and South Eastern Cape and undertake the spring/summer, northward spawning migration to KwaZulu-Natal. After joining the resident spawner stock in KwaZulu-Natal and spawning in the offshore environment of KwaZulu-Natal, adults soon return to the southern regions of their distributional range. Juveniles recruit into KwaZulu-Natal estuaries at a length of 25 - 35 mm TL. A proportion of the eggs and larvae are transported southwards along the periphery of the western boundary Agulhas Current where juveniles (25 - 30 mm TL) recruit into the estuaries as far south as the Swartvlei estuary in the Western Cape. There is evidence to suggest that the fish, which occur in the Western Cape estuaries, have migrated there once they have attained sexual maturity further east.
- Full Text:
- Date Issued: 2003
Botanical inventory and phenology in relation to foraging behaviour of the Cape honeybees (Apis Mellifera Capensis) at a site in the Eastern Cape, South Africa
- Authors: Merti, Admassu Addi
- Date: 2003
- Subjects: Fynbos -- South Africa -- Eastern Cape , Honeybee -- South Africa -- Eastern Cape , Honey plants -- South Africa -- Eastern Cape , Honeybee -- South Africa -- Eastern Cape -- Food , Plant ecology -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4214 , http://hdl.handle.net/10962/d1003783 , Fynbos -- South Africa -- Eastern Cape , Honeybee -- South Africa -- Eastern Cape , Honey plants -- South Africa -- Eastern Cape , Honeybee -- South Africa -- Eastern Cape -- Food , Plant ecology -- South Africa -- Eastern Cape
- Description: From an apicultural point of view the Cape fynbos is under-utilised and our knowledge of its utilization by the Cape honeybees is incomplete. The key aim of this study was to test the hypothesis that the Cape honeybees utilize the fynbos species as the preferred source of nectar and pollen. Subsidiary aims included distinguishing vegetation communities in the area, identifying pollen and nectar sources, the relationship between brood population and seasonal pollen collection patterns, examining the effect of meteorological factors on pollen collection. The study site was on Rivendell Farm within the Eastern Cape Albany district: an area of high species richness. A checklist of vascular plant species was produced revealing 97 families, 271 genera and 448 species. A classification by two-way indicator species (TWINSPAN) recognized seven vegetation communities: Forest, Bush clumps, Acacia savanna, Grassland, Grassy fynbos, Fynbos and Shrubland. Direct field observations of the foraging of Cape honeybees identified 54 nectar and pollen source plant species. Honeybee pollen loads trapped from four colonies of hives identified 37 pollen source plants of which Metalasia muricata, Eucalyptus grandis, Eucalyptus camaldulensis, Erica chamissonis, Helichrysum odoratissimum, Helichrysum anomalum, Crassula cultrata and Acacia longifolia were the predominant pollen source plants. It was also found that 60% of pollen yield derived from fynbos vegetation. The pollen source plants came from both Cape endemic and from nonendemic species. Thus we reject the hypothesis that Cape honeybees selectively forage fynbos species as a preferred source of pollen and nectar. The examination of the effect of temperature, wind-speed and temperature on pollen collection activity of honeybees revealed that: a temperature range of between 14°C to 26°C was optimal for pollen collection; wind speeds of up to 4m/s were conducive for pollen collection; relative humidity was found to have no significant influence on pollen collection. Pollen collection and brood rearing patterns are positively correlated with flowering intensities, but we found in our Eastern Cape study site that brood rearing was not limited to the spring flowering season but did extend to the end of summer. In order to determine the available nectar yield of common plant species hourly secretion of nectar volumes was measured for 24 hours to determine the variation of available nectar during different times of the day. In all nectar producing species the nectar volume was high in the early morning and declined as the day progressed. We found that the volume of available nectar was affected by prevailing temperature and humidity around the flowers.
- Full Text:
- Date Issued: 2003
- Authors: Merti, Admassu Addi
- Date: 2003
- Subjects: Fynbos -- South Africa -- Eastern Cape , Honeybee -- South Africa -- Eastern Cape , Honey plants -- South Africa -- Eastern Cape , Honeybee -- South Africa -- Eastern Cape -- Food , Plant ecology -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4214 , http://hdl.handle.net/10962/d1003783 , Fynbos -- South Africa -- Eastern Cape , Honeybee -- South Africa -- Eastern Cape , Honey plants -- South Africa -- Eastern Cape , Honeybee -- South Africa -- Eastern Cape -- Food , Plant ecology -- South Africa -- Eastern Cape
- Description: From an apicultural point of view the Cape fynbos is under-utilised and our knowledge of its utilization by the Cape honeybees is incomplete. The key aim of this study was to test the hypothesis that the Cape honeybees utilize the fynbos species as the preferred source of nectar and pollen. Subsidiary aims included distinguishing vegetation communities in the area, identifying pollen and nectar sources, the relationship between brood population and seasonal pollen collection patterns, examining the effect of meteorological factors on pollen collection. The study site was on Rivendell Farm within the Eastern Cape Albany district: an area of high species richness. A checklist of vascular plant species was produced revealing 97 families, 271 genera and 448 species. A classification by two-way indicator species (TWINSPAN) recognized seven vegetation communities: Forest, Bush clumps, Acacia savanna, Grassland, Grassy fynbos, Fynbos and Shrubland. Direct field observations of the foraging of Cape honeybees identified 54 nectar and pollen source plant species. Honeybee pollen loads trapped from four colonies of hives identified 37 pollen source plants of which Metalasia muricata, Eucalyptus grandis, Eucalyptus camaldulensis, Erica chamissonis, Helichrysum odoratissimum, Helichrysum anomalum, Crassula cultrata and Acacia longifolia were the predominant pollen source plants. It was also found that 60% of pollen yield derived from fynbos vegetation. The pollen source plants came from both Cape endemic and from nonendemic species. Thus we reject the hypothesis that Cape honeybees selectively forage fynbos species as a preferred source of pollen and nectar. The examination of the effect of temperature, wind-speed and temperature on pollen collection activity of honeybees revealed that: a temperature range of between 14°C to 26°C was optimal for pollen collection; wind speeds of up to 4m/s were conducive for pollen collection; relative humidity was found to have no significant influence on pollen collection. Pollen collection and brood rearing patterns are positively correlated with flowering intensities, but we found in our Eastern Cape study site that brood rearing was not limited to the spring flowering season but did extend to the end of summer. In order to determine the available nectar yield of common plant species hourly secretion of nectar volumes was measured for 24 hours to determine the variation of available nectar during different times of the day. In all nectar producing species the nectar volume was high in the early morning and declined as the day progressed. We found that the volume of available nectar was affected by prevailing temperature and humidity around the flowers.
- Full Text:
- Date Issued: 2003
Building blocks of marketing strategy for targeting local biltong hunters: an evaluation
- Authors: Van Eyk, Marlé
- Date: 2003
- Subjects: Marketing , Big game hunting -- South Africa -- Eastern Cape -- Marketing , Dried meat -- South Africa -- Eastern Cape , Hunters -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MTech (Marketing)
- Identifier: vital:10770 , http://hdl.handle.net/10948/207 , Marketing , Big game hunting -- South Africa -- Eastern Cape -- Marketing , Dried meat -- South Africa -- Eastern Cape , Hunters -- South Africa -- Eastern Cape
- Description: Game ranch owners are spoilt by the high prices overseas hunters are prepared to pay, and tend to forget that in the long term it is the local market that may ensure the survival of the game industry. More effort should therefore be put into marketing hunting opportunities for the local hunter. This research focused on analysing the typical building blocks of marketing strategy applicable to service organizations. This was done to determine and evaluate the building blocks of marketing strategy applicable to game ranches in the Eastern Cape Province who are targeting local biltong hunters. A literature review was conducted to determine the ideal building blocks of marketing strategy for service organizations such as game ranches. Thereafter, a survey was conducted by means of a questionnaire to determine the ranchers' perceptions of marketing and evaluate their marketing strategies. Most of the respondents: had a fair idea of what marketing entails; were unaware of the thread that links customer expectations, satisfaction and loyalty; realized the importance of relationship marketing with external markets, but not with internal markets; perceived direct competition as their biggest threat, while other travel opportunities were seen as the most important substitute for hunting; mainly positioned themselves based on the features the ranch offered, and believed that the standard of service delivery and physical features of the ranch (the nature of the offering) were their important competitive advantages. The study proposes that the framework of building blocks of marketing strategy, designed by the researcher be used as a tool with which marketing strategies for game ranches in the Eastern Cape Province targeting local biltong hunters could be developed. Additional research on topics such as advertising and the various market opportunity strategies of diversification and product development, could lead to improvement and modification of this framework, making it an even more powerful tool in developing marketing strategies.
- Full Text:
- Date Issued: 2003
- Authors: Van Eyk, Marlé
- Date: 2003
- Subjects: Marketing , Big game hunting -- South Africa -- Eastern Cape -- Marketing , Dried meat -- South Africa -- Eastern Cape , Hunters -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MTech (Marketing)
- Identifier: vital:10770 , http://hdl.handle.net/10948/207 , Marketing , Big game hunting -- South Africa -- Eastern Cape -- Marketing , Dried meat -- South Africa -- Eastern Cape , Hunters -- South Africa -- Eastern Cape
- Description: Game ranch owners are spoilt by the high prices overseas hunters are prepared to pay, and tend to forget that in the long term it is the local market that may ensure the survival of the game industry. More effort should therefore be put into marketing hunting opportunities for the local hunter. This research focused on analysing the typical building blocks of marketing strategy applicable to service organizations. This was done to determine and evaluate the building blocks of marketing strategy applicable to game ranches in the Eastern Cape Province who are targeting local biltong hunters. A literature review was conducted to determine the ideal building blocks of marketing strategy for service organizations such as game ranches. Thereafter, a survey was conducted by means of a questionnaire to determine the ranchers' perceptions of marketing and evaluate their marketing strategies. Most of the respondents: had a fair idea of what marketing entails; were unaware of the thread that links customer expectations, satisfaction and loyalty; realized the importance of relationship marketing with external markets, but not with internal markets; perceived direct competition as their biggest threat, while other travel opportunities were seen as the most important substitute for hunting; mainly positioned themselves based on the features the ranch offered, and believed that the standard of service delivery and physical features of the ranch (the nature of the offering) were their important competitive advantages. The study proposes that the framework of building blocks of marketing strategy, designed by the researcher be used as a tool with which marketing strategies for game ranches in the Eastern Cape Province targeting local biltong hunters could be developed. Additional research on topics such as advertising and the various market opportunity strategies of diversification and product development, could lead to improvement and modification of this framework, making it an even more powerful tool in developing marketing strategies.
- Full Text:
- Date Issued: 2003
CBiX a model for content-based billing in XML environments
- Authors: De Villiers, Peter
- Date: 2003
- Subjects: XML (Document Markup Language) , Access control , Pricing
- Language: English
- Type: Thesis , Masters , MTech (Information Technology)
- Identifier: vital:10802 , http://hdl.handle.net/10948/208 , XML (Document Markup Language) , Access control , Pricing
- Description: The new global economy is based on knowledge and information. Further- more, the Internet is facilitating new forms of revenue generation of which one recognized potential source is content delivery over the Internet. One aspect that is critical to ensuring a content-based revenue stream is billing. While there are a number of content-based billing systems commercially available, as far as can be determined these products are not based on a common model that can ensure interoperability and communication between the billing sys- tems. This dissertation addresses the need for a content-based billing model by developing the CBiX (Content-based Billing in XML Environments) model. This model, developed in a phased approach as a family of billing models, incorporates three aspects. The rst aspect is access control. The second as- pect is pricing, in the form of document, element and inherited element level pricing for content. The third aspect is XML as the platform for information exchange. The nature of the Internet facilitates information interchange, exible web business models and exible pricing. These facts, coupled with CBiX being concerned with billing for content over the Internet, leads to a number of decisions regarding the model: The CBiX model has to incorporate exible pricing. Therefore pricing is evolved through the development of the family of models from doc- ument level pricing to element level pricing to inherited element level pricing. The CBiX model has to be based on a platform for information inter- change that enables content delivery. XML provides a broad family of standards that is widely supported and creating the next generation Internet. XML is therefore selected as the environment for information exchange for CBiX. The CBiX model requires a form of access control that can provide access to content based on user properties. Credential-based Access Control is therefore selected as the method of access control for CBiX, whereby authorization is granted based on a set of user credentials. Furthermore, this dissertation reports on the development of a prototype. This serves a dual purpose: rstly, to assist the author in understanding the technologies and principles involved; secondly, to illustrate CBiX0 and therefore present a proof-of-concept of at least the base model. The CBiX model provides a base to guide and assist developers with regards to the issues involved with developing a billing system for XML- based environments.
- Full Text:
- Date Issued: 2003
- Authors: De Villiers, Peter
- Date: 2003
- Subjects: XML (Document Markup Language) , Access control , Pricing
- Language: English
- Type: Thesis , Masters , MTech (Information Technology)
- Identifier: vital:10802 , http://hdl.handle.net/10948/208 , XML (Document Markup Language) , Access control , Pricing
- Description: The new global economy is based on knowledge and information. Further- more, the Internet is facilitating new forms of revenue generation of which one recognized potential source is content delivery over the Internet. One aspect that is critical to ensuring a content-based revenue stream is billing. While there are a number of content-based billing systems commercially available, as far as can be determined these products are not based on a common model that can ensure interoperability and communication between the billing sys- tems. This dissertation addresses the need for a content-based billing model by developing the CBiX (Content-based Billing in XML Environments) model. This model, developed in a phased approach as a family of billing models, incorporates three aspects. The rst aspect is access control. The second as- pect is pricing, in the form of document, element and inherited element level pricing for content. The third aspect is XML as the platform for information exchange. The nature of the Internet facilitates information interchange, exible web business models and exible pricing. These facts, coupled with CBiX being concerned with billing for content over the Internet, leads to a number of decisions regarding the model: The CBiX model has to incorporate exible pricing. Therefore pricing is evolved through the development of the family of models from doc- ument level pricing to element level pricing to inherited element level pricing. The CBiX model has to be based on a platform for information inter- change that enables content delivery. XML provides a broad family of standards that is widely supported and creating the next generation Internet. XML is therefore selected as the environment for information exchange for CBiX. The CBiX model requires a form of access control that can provide access to content based on user properties. Credential-based Access Control is therefore selected as the method of access control for CBiX, whereby authorization is granted based on a set of user credentials. Furthermore, this dissertation reports on the development of a prototype. This serves a dual purpose: rstly, to assist the author in understanding the technologies and principles involved; secondly, to illustrate CBiX0 and therefore present a proof-of-concept of at least the base model. The CBiX model provides a base to guide and assist developers with regards to the issues involved with developing a billing system for XML- based environments.
- Full Text:
- Date Issued: 2003
Cimetidine as a free radical scavenger
- Authors: Lambat, Zaynab Yusuf
- Date: 2003
- Subjects: Cimetidine , Cimetidine -- Physiological effect , Cimetidine -- Therapeutic use , Alzheimer's disease -- Treatment , Cancer -- Treatment , Free radicals (Chemistry) -- Physiological effect
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:3766 , http://hdl.handle.net/10962/d1003244 , Cimetidine , Cimetidine -- Physiological effect , Cimetidine -- Therapeutic use , Alzheimer's disease -- Treatment , Cancer -- Treatment , Free radicals (Chemistry) -- Physiological effect
- Description: The present study was undertaken to determine the effects and possible mechanism of action of cimetidine in cancer and Alzheimer’s disease (AD). Throughout this study emphasis is placed on free radical levels since the magnitude of the relationship between diseases and the levels of free radicals vary from one disease to another. Studies were carried out to examine the effect of cimetidine on free radical levels using superoxide formation and lipid peroxidation as indicators of free radical levels. The experiments revealed that addition of cimetidine, especially in high concentrations (0.5 and 1.0 x10-6 M) significantly inhibited WHCO6 cancer cell growth rather than cancer cell growth, as no normal control was available. Free radical formation as well as hydroxyl radical formation were reduced in the deoxyribose assay. In addition, cimetidine exhibits properties of binding to metals such as copper and iron. To maintain consistency in the experiments, a WHCO6 (Wits Human Carcinoma of the Oesophagus) cell line was used to investigate the effect of cimetidine in cancer. Neurodegeneration was induced in the rat brain using neurotoxins such as cyanide to investigate the relationship between cimetidine in AD. A decrease in cancer cell growth was accompanied by a concomitant decrease in the levels of free radicals and lipid peroxidation, suggesting that the growth-inhibitory effects of cimetidine on WHCO6 cancer cells in vitro may be due to free radical scavenging properties. This proposal was further strengthened by determination of free radical levels in the rat brain. After treatment with neurotoxins to induce neurodegeneration, the levels of free radicals in the rat brain suggest that addition of cimetidine reduces free radical levels in the rat brain in a dosedependent manner. Further experiments were done in an attempt to uncover the underlying mechanism by which cimetidine exhibits free radical scavenging properties. Metal binding studies were done using electrochemical, HPLC and UV/Vis studies. The results show that cimetidine binds iron and copper. These metals have been implicated in free radical production via the Fenton reaction. By binding with cimetidine the metals become unavailable to produce free radicals and hence cimetidine indirectly reduces the formation of free radicals. The final experiment was the determination of cimetidine as a hydroxyl radical scavenger in the deoxyribose assay. Cimetidine was shown to act as a potent hydroxyl radical scavenger, thereby confirming its activity as a free radical scavenger. In addition, cimetidine protects against damage to the deoxyribose sugar, a component of DNA. Whilst there are many theories that explain the therapeutic role of cimetidine in degenerative disease, the actual mechanism of the role of cimetidine is emphasized as a free radical scavenger. Regardless of the mechanism of action, cimetidine does inhibit tumour growth according to this study and also reduce free radical levels in neurodegeneration, which suggests a role for cimetidine as a possible additive in treatment of patients with such disease states. These findings have important clinical implications, and needs to be investigated further.
- Full Text:
- Date Issued: 2003
- Authors: Lambat, Zaynab Yusuf
- Date: 2003
- Subjects: Cimetidine , Cimetidine -- Physiological effect , Cimetidine -- Therapeutic use , Alzheimer's disease -- Treatment , Cancer -- Treatment , Free radicals (Chemistry) -- Physiological effect
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:3766 , http://hdl.handle.net/10962/d1003244 , Cimetidine , Cimetidine -- Physiological effect , Cimetidine -- Therapeutic use , Alzheimer's disease -- Treatment , Cancer -- Treatment , Free radicals (Chemistry) -- Physiological effect
- Description: The present study was undertaken to determine the effects and possible mechanism of action of cimetidine in cancer and Alzheimer’s disease (AD). Throughout this study emphasis is placed on free radical levels since the magnitude of the relationship between diseases and the levels of free radicals vary from one disease to another. Studies were carried out to examine the effect of cimetidine on free radical levels using superoxide formation and lipid peroxidation as indicators of free radical levels. The experiments revealed that addition of cimetidine, especially in high concentrations (0.5 and 1.0 x10-6 M) significantly inhibited WHCO6 cancer cell growth rather than cancer cell growth, as no normal control was available. Free radical formation as well as hydroxyl radical formation were reduced in the deoxyribose assay. In addition, cimetidine exhibits properties of binding to metals such as copper and iron. To maintain consistency in the experiments, a WHCO6 (Wits Human Carcinoma of the Oesophagus) cell line was used to investigate the effect of cimetidine in cancer. Neurodegeneration was induced in the rat brain using neurotoxins such as cyanide to investigate the relationship between cimetidine in AD. A decrease in cancer cell growth was accompanied by a concomitant decrease in the levels of free radicals and lipid peroxidation, suggesting that the growth-inhibitory effects of cimetidine on WHCO6 cancer cells in vitro may be due to free radical scavenging properties. This proposal was further strengthened by determination of free radical levels in the rat brain. After treatment with neurotoxins to induce neurodegeneration, the levels of free radicals in the rat brain suggest that addition of cimetidine reduces free radical levels in the rat brain in a dosedependent manner. Further experiments were done in an attempt to uncover the underlying mechanism by which cimetidine exhibits free radical scavenging properties. Metal binding studies were done using electrochemical, HPLC and UV/Vis studies. The results show that cimetidine binds iron and copper. These metals have been implicated in free radical production via the Fenton reaction. By binding with cimetidine the metals become unavailable to produce free radicals and hence cimetidine indirectly reduces the formation of free radicals. The final experiment was the determination of cimetidine as a hydroxyl radical scavenger in the deoxyribose assay. Cimetidine was shown to act as a potent hydroxyl radical scavenger, thereby confirming its activity as a free radical scavenger. In addition, cimetidine protects against damage to the deoxyribose sugar, a component of DNA. Whilst there are many theories that explain the therapeutic role of cimetidine in degenerative disease, the actual mechanism of the role of cimetidine is emphasized as a free radical scavenger. Regardless of the mechanism of action, cimetidine does inhibit tumour growth according to this study and also reduce free radical levels in neurodegeneration, which suggests a role for cimetidine as a possible additive in treatment of patients with such disease states. These findings have important clinical implications, and needs to be investigated further.
- Full Text:
- Date Issued: 2003
Confirmation of a slow symplasmic loading and unloading pathway in barley (Hordeum Vulgare L.) source and sink leaves
- Authors: Buwa, Lisa Valencia
- Date: 2003
- Subjects: Phloem , Plant translocation , Barley -- Metabolism
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4253 , http://hdl.handle.net/10962/d1007804
- Description: Visualization of the transport pathway in barley (Hordeum vulgare) leaves was carried out using a combination of aniline blue and a symplasmically transported fluorochrome, 5,6 carboxyfluorescein (5,6-CF). When applied to a source leaf, basipetal movement of 5,6-CF was observed after 3 h and the fluorochrome front was observed about 3-4cm away from the point of application. The fluorochrome was taken up into the symplasm of the mesophyll and was loaded into the bundle sheath cells and then subsequently the vascular parenchyma and finally into the sieve tubes. In sink leaves, acropetal movement was observed after 3 h and the fluorochrome had moved approximately 3 cm away from the point of application. Unloading of 5,6-CF occurred from all classes of longitudinal veins. Studies on solute retrieval showed that 5,6 CF-diacetate was transferred to xylem parenchyma where it was metabolized. 5,6-CF was then transferred from the xylem parenchyma to the vascular parenchyma cells, and it would appear that thick-walled sieve tubes were the first to show 5,6-CF labeling. Counterstaining with aniline blue demonstrates the presence of plasmodesmata and this suggests a potential symplasmic pathway from the mesophyll to the sieve tubes. Application of 5,6 CF-diacetate revealed a slow symplasmic pathway, which involved transfer of 5,6-CF, which was effected via plasmodesma.
- Full Text:
- Date Issued: 2003
- Authors: Buwa, Lisa Valencia
- Date: 2003
- Subjects: Phloem , Plant translocation , Barley -- Metabolism
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4253 , http://hdl.handle.net/10962/d1007804
- Description: Visualization of the transport pathway in barley (Hordeum vulgare) leaves was carried out using a combination of aniline blue and a symplasmically transported fluorochrome, 5,6 carboxyfluorescein (5,6-CF). When applied to a source leaf, basipetal movement of 5,6-CF was observed after 3 h and the fluorochrome front was observed about 3-4cm away from the point of application. The fluorochrome was taken up into the symplasm of the mesophyll and was loaded into the bundle sheath cells and then subsequently the vascular parenchyma and finally into the sieve tubes. In sink leaves, acropetal movement was observed after 3 h and the fluorochrome had moved approximately 3 cm away from the point of application. Unloading of 5,6-CF occurred from all classes of longitudinal veins. Studies on solute retrieval showed that 5,6 CF-diacetate was transferred to xylem parenchyma where it was metabolized. 5,6-CF was then transferred from the xylem parenchyma to the vascular parenchyma cells, and it would appear that thick-walled sieve tubes were the first to show 5,6-CF labeling. Counterstaining with aniline blue demonstrates the presence of plasmodesmata and this suggests a potential symplasmic pathway from the mesophyll to the sieve tubes. Application of 5,6 CF-diacetate revealed a slow symplasmic pathway, which involved transfer of 5,6-CF, which was effected via plasmodesma.
- Full Text:
- Date Issued: 2003
Constructive dismissal in labour law
- Van Loggerenberg, Johannes Jurgens
- Authors: Van Loggerenberg, Johannes Jurgens
- Date: 2003
- Subjects: Employees -- Dismissal of -- Law and legislation -- South Africa , Unfair labor practices -- South Africa , Labor laws and legislation -- South Africa
- Language: English
- Type: Thesis , Masters , LLM
- Identifier: vital:11054 , http://hdl.handle.net/10948/301 , Employees -- Dismissal of -- Law and legislation -- South Africa , Unfair labor practices -- South Africa , Labor laws and legislation -- South Africa
- Description: The history of constructive dismissals in South Africa imitated from the English law in 1986, when an employee successfully challenged the employer on this particular concept after an incident relating a forced resignation. From the literature it is clear that constructive dismissal, as we know it today, originated from our English counterparts. Being a relatively new concept, the South African labour laws caught on at a rapid pace. The leading case on which the South African authors leaned towards was the English case of Woods v WM Car Services (Peterborough). In South Africa constructive dismissals were given statutory force in unfair dismissal law and is defined as the coerced or forced termination of a contract of employment resultant in from the conduct of the employer. There are many forms in which constructive dismissals would postulate that could justify an employee to lay claim to constructive dismissal. Examples thereof are the amendment of the contract of employment, rude language and sexual harassment. It is eminent that certain elements should be present before an employee would have reasonable prospects of succeeding with such a claim. Constructive dismissal comes into the equation when an employer behaves in such a manner that eventually and ultimately leads to the employee, being the receiving party, in the employment relationship, to terminate the employment contract. This termination must be the direct result of the conduct of the employer that irreparably frustrated the relationship and made it impossible for the employee to remain in the service of the employer in question. It appears that the courts have taken a firm stance on coerced or forced resignation, in its various forms tantamount to breach of contact, that any sufficiently unreasonable conduct by an employer may justify that the employee to terminate services and lay claim to the fact that he had been constructively dismissed. It needs to be mentioned that the fact that the mere fact that the employer acted in an unreasonable manner would not suffice and it is up to the employee to prove how the conduct of the employer justified the employee to leave and claim that the employer’s conduct resulted in a material or fundamental beach of the employment contract. In dealing with the contingency of the concept of constructive dismissals it has been expressly provided for in numerous systems of labour law. As is seen herein, a constructive dismissal consists in the termination of the employment contract by reason of the employee’s rather than the employer’s own immediate act. The act of the employee is precipitated by earlier conduct on the part of the employer, which conduct may or may not be justified. Various authors and academics endeavoured to defined constructive dismissal and all had the same or at least some of the elements present, to justify constructive dismissal. The most glaring element being the termination of employment as a result of the any conduct that is tantamount to a breach going to the root of the relationship by the employer, that frustrated the relationship between the employer and the employee and rendered it irreparable. The employee resigns or repudiates the employment contract as a result of the employer normally not leaving the employee any other option but to resign. This can also be termed as coerced or forced resignations and are commonly better known as “constructive dismissal”. The employee is deemed to have been dismissed, even though it is the employee who terminated the employment contract. The most important element to mention is the employee terminated the employment contract, ie resigned yet this is regarded as a dismissal, it is however for the employee to first lay a claim at the proper authority and the employee must prove his / her allegation before it can be a constructive dismissal. As will become clear, that the onus of proof is on the employee to show that the termination of employment resulted from the conduct of the employer. Equally true as in all cases of constructive dismissal, including cases of sexual harassment, being a ground for constructive dismissal, the employee must prove that to remain in service would have been unbearable and intolerable. Sexual harassment is one of the most difficult forms of constructive dismissals, in many cases there are no witnesses and the employee either “suffers in silence or opt to place her dignity at stake to prove her case. It seems as though the test is to determine if the employer’s conduct evinced a deliberate and oppressive intention to have the employment terminated and left the employee with only one option that of resignation to protect her interests. Employees have a right to seek statutory relief and needs to be protected. If a coerced or forced resignation had taken place irrespective whether the employee resigned or not. It is against this back drop that constructive dismissals was given legality and are now recognized as one of the four forms of dismissals in terms of the Act.
- Full Text:
- Date Issued: 2003
- Authors: Van Loggerenberg, Johannes Jurgens
- Date: 2003
- Subjects: Employees -- Dismissal of -- Law and legislation -- South Africa , Unfair labor practices -- South Africa , Labor laws and legislation -- South Africa
- Language: English
- Type: Thesis , Masters , LLM
- Identifier: vital:11054 , http://hdl.handle.net/10948/301 , Employees -- Dismissal of -- Law and legislation -- South Africa , Unfair labor practices -- South Africa , Labor laws and legislation -- South Africa
- Description: The history of constructive dismissals in South Africa imitated from the English law in 1986, when an employee successfully challenged the employer on this particular concept after an incident relating a forced resignation. From the literature it is clear that constructive dismissal, as we know it today, originated from our English counterparts. Being a relatively new concept, the South African labour laws caught on at a rapid pace. The leading case on which the South African authors leaned towards was the English case of Woods v WM Car Services (Peterborough). In South Africa constructive dismissals were given statutory force in unfair dismissal law and is defined as the coerced or forced termination of a contract of employment resultant in from the conduct of the employer. There are many forms in which constructive dismissals would postulate that could justify an employee to lay claim to constructive dismissal. Examples thereof are the amendment of the contract of employment, rude language and sexual harassment. It is eminent that certain elements should be present before an employee would have reasonable prospects of succeeding with such a claim. Constructive dismissal comes into the equation when an employer behaves in such a manner that eventually and ultimately leads to the employee, being the receiving party, in the employment relationship, to terminate the employment contract. This termination must be the direct result of the conduct of the employer that irreparably frustrated the relationship and made it impossible for the employee to remain in the service of the employer in question. It appears that the courts have taken a firm stance on coerced or forced resignation, in its various forms tantamount to breach of contact, that any sufficiently unreasonable conduct by an employer may justify that the employee to terminate services and lay claim to the fact that he had been constructively dismissed. It needs to be mentioned that the fact that the mere fact that the employer acted in an unreasonable manner would not suffice and it is up to the employee to prove how the conduct of the employer justified the employee to leave and claim that the employer’s conduct resulted in a material or fundamental beach of the employment contract. In dealing with the contingency of the concept of constructive dismissals it has been expressly provided for in numerous systems of labour law. As is seen herein, a constructive dismissal consists in the termination of the employment contract by reason of the employee’s rather than the employer’s own immediate act. The act of the employee is precipitated by earlier conduct on the part of the employer, which conduct may or may not be justified. Various authors and academics endeavoured to defined constructive dismissal and all had the same or at least some of the elements present, to justify constructive dismissal. The most glaring element being the termination of employment as a result of the any conduct that is tantamount to a breach going to the root of the relationship by the employer, that frustrated the relationship between the employer and the employee and rendered it irreparable. The employee resigns or repudiates the employment contract as a result of the employer normally not leaving the employee any other option but to resign. This can also be termed as coerced or forced resignations and are commonly better known as “constructive dismissal”. The employee is deemed to have been dismissed, even though it is the employee who terminated the employment contract. The most important element to mention is the employee terminated the employment contract, ie resigned yet this is regarded as a dismissal, it is however for the employee to first lay a claim at the proper authority and the employee must prove his / her allegation before it can be a constructive dismissal. As will become clear, that the onus of proof is on the employee to show that the termination of employment resulted from the conduct of the employer. Equally true as in all cases of constructive dismissal, including cases of sexual harassment, being a ground for constructive dismissal, the employee must prove that to remain in service would have been unbearable and intolerable. Sexual harassment is one of the most difficult forms of constructive dismissals, in many cases there are no witnesses and the employee either “suffers in silence or opt to place her dignity at stake to prove her case. It seems as though the test is to determine if the employer’s conduct evinced a deliberate and oppressive intention to have the employment terminated and left the employee with only one option that of resignation to protect her interests. Employees have a right to seek statutory relief and needs to be protected. If a coerced or forced resignation had taken place irrespective whether the employee resigned or not. It is against this back drop that constructive dismissals was given legality and are now recognized as one of the four forms of dismissals in terms of the Act.
- Full Text:
- Date Issued: 2003
Cyber crime affecting some businesses in South Africa
- Authors: Herselman, Martha Elizabeth
- Date: 2003
- Subjects: Computer crimes , Business enterprises -- South Africa
- Language: English
- Type: Thesis , Masters , MTech (Business Information Systems)
- Identifier: vital:10793 , http://hdl.handle.net/10948/212 , Computer crimes , Business enterprises -- South Africa
- Description: This study shows that cyber crime is a recent addition to the list of crimes that can adversely affect businesses directly of indirectly. This phenomenon was not directly prosecutable in South Africa until the enactment of the ECT Act in July 2002. However this Act also prevents businesses to fully prosecute a hacker due to incompleteness. Any kind of commercially related crime can be duplicated as cyber crime. Therefore very little research appears or has been documented about cyber crime in South African companies before 2003.11.21 The motivation to do this study was that businesses often loose millions in cyber attacks, not necessarily through direct theft but by the loss of service and damage to the image of the company. Most of the companies that were approached for interviews on cyber crime were reluctant to share the fact that they were hacked or that cyber crime occurred at their company as it violates their security policies and may expose their fragile security platforms. The purpose of this study was to attempt to get an overall view on how South African businesses are affected by cyber crime in the banking and short term insurance sector of the South African industry and also to determine what legislation exist in this country to protect them. The case study approach was used to determine the affect of cyber crime on businesses like banks and insurance companies. Each case was interviewed, monitored and was observed over a period of a year. This study discloses the evaluation of the results of how cyber crime affected the cases, which were part of this study. The banks felt that they were at an increased risk both externally and internally, which is likely to increase as the migration towards electronic commerce occurs. The insurance industry felt that they are not yet affected by external cyber crime attacks in this country.
- Full Text:
- Date Issued: 2003
- Authors: Herselman, Martha Elizabeth
- Date: 2003
- Subjects: Computer crimes , Business enterprises -- South Africa
- Language: English
- Type: Thesis , Masters , MTech (Business Information Systems)
- Identifier: vital:10793 , http://hdl.handle.net/10948/212 , Computer crimes , Business enterprises -- South Africa
- Description: This study shows that cyber crime is a recent addition to the list of crimes that can adversely affect businesses directly of indirectly. This phenomenon was not directly prosecutable in South Africa until the enactment of the ECT Act in July 2002. However this Act also prevents businesses to fully prosecute a hacker due to incompleteness. Any kind of commercially related crime can be duplicated as cyber crime. Therefore very little research appears or has been documented about cyber crime in South African companies before 2003.11.21 The motivation to do this study was that businesses often loose millions in cyber attacks, not necessarily through direct theft but by the loss of service and damage to the image of the company. Most of the companies that were approached for interviews on cyber crime were reluctant to share the fact that they were hacked or that cyber crime occurred at their company as it violates their security policies and may expose their fragile security platforms. The purpose of this study was to attempt to get an overall view on how South African businesses are affected by cyber crime in the banking and short term insurance sector of the South African industry and also to determine what legislation exist in this country to protect them. The case study approach was used to determine the affect of cyber crime on businesses like banks and insurance companies. Each case was interviewed, monitored and was observed over a period of a year. This study discloses the evaluation of the results of how cyber crime affected the cases, which were part of this study. The banks felt that they were at an increased risk both externally and internally, which is likely to increase as the migration towards electronic commerce occurs. The insurance industry felt that they are not yet affected by external cyber crime attacks in this country.
- Full Text:
- Date Issued: 2003
Cyclodepsipeptides from a Kenyan marine cyanobacterium
- Authors: Dzeha, Thomas Mwambire
- Date: 2003
- Subjects: Cyanobacteria , Stereochemistry , Natural products -- Kenya
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4303 , http://hdl.handle.net/10962/d1004961 , Cyanobacteria , Stereochemistry , Natural products -- Kenya
- Description: An examination of an organic extract of the cyanobacterium Lyngbya majuscula collected from Wasini Island off the southern Kenyan coast led to the isolation of the known cyclodepsipeptide antanapeptin A (7), recently isolated from a Madagascan collection of L. majuscula, and a new bioactive cyclodepsipeptide, homodolastatin 16 (42). Although L. majuscula is a common, pantropical cyanobacterium this study represents the first investigation of the natural product chemistry of a Kenyan population of L. majuscula. The structures of the two cyclodepsipeptides were determined from 2D NMR and mass spectrometry data. The L- stereochemistry of the proline, valine, and N-methylphenylalanine amino acids in 7 and the L – proline configuration in 42, was confirmed by Marfey’s HPLC method. Chiral GC was used to determine the absolute stereochemistry of the hydroxyisovaleric acid moiety in 7 and 42, the lactate residue in 42 and tentatively propose an L-stereochemistry for the Nmethylisoleucine amino acid in 42. Homodolastatin 16, a higher homologue of the potential anti-cancer agent, dolastatin 16, exhibited moderate activity against two oesophageal cancer cell lines.
- Full Text:
- Date Issued: 2003
- Authors: Dzeha, Thomas Mwambire
- Date: 2003
- Subjects: Cyanobacteria , Stereochemistry , Natural products -- Kenya
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4303 , http://hdl.handle.net/10962/d1004961 , Cyanobacteria , Stereochemistry , Natural products -- Kenya
- Description: An examination of an organic extract of the cyanobacterium Lyngbya majuscula collected from Wasini Island off the southern Kenyan coast led to the isolation of the known cyclodepsipeptide antanapeptin A (7), recently isolated from a Madagascan collection of L. majuscula, and a new bioactive cyclodepsipeptide, homodolastatin 16 (42). Although L. majuscula is a common, pantropical cyanobacterium this study represents the first investigation of the natural product chemistry of a Kenyan population of L. majuscula. The structures of the two cyclodepsipeptides were determined from 2D NMR and mass spectrometry data. The L- stereochemistry of the proline, valine, and N-methylphenylalanine amino acids in 7 and the L – proline configuration in 42, was confirmed by Marfey’s HPLC method. Chiral GC was used to determine the absolute stereochemistry of the hydroxyisovaleric acid moiety in 7 and 42, the lactate residue in 42 and tentatively propose an L-stereochemistry for the Nmethylisoleucine amino acid in 42. Homodolastatin 16, a higher homologue of the potential anti-cancer agent, dolastatin 16, exhibited moderate activity against two oesophageal cancer cell lines.
- Full Text:
- Date Issued: 2003
Design and development of a remote reconfigurable internet embedded I/O controller
- Authors: Phillips, Grant
- Date: 2003
- Subjects: Embedded computer systems -- Design and construction , Computer input-output equipment , Programmable controllers , Electronic controllers -- Design and construction
- Language: English
- Type: Thesis , Masters , MTech (Electrical Engineering)
- Identifier: vital:10817 , http://hdl.handle.net/10948/116 , Embedded computer systems -- Design and construction , Computer input-output equipment , Programmable controllers , Electronic controllers -- Design and construction
- Description: The use of embedded Internet systems is growing rapidly in the manufacturing sector. These systems allow the monitoring and controlling of plant machinery and manufactured items from a remote location via a standard Web interface. In a manufacturing environment, it is inevitable that long running processes will require support for dynamic reconfiguration because, for example, machines may fail, services may be moved or withdrawn and user requirements may change. In such an environment it is essential that the operation and architecture of such processes can be modified to reflect such changes. This research project will present methods and ideas for establishing a reconfigurable remote system by using standard 8-bit microcontrollers and reconfigurable hardware. It will allow a manufacturing process to be modified and changed within minutes without even having to be physically present at the location where the process is running.
- Full Text:
- Date Issued: 2003
- Authors: Phillips, Grant
- Date: 2003
- Subjects: Embedded computer systems -- Design and construction , Computer input-output equipment , Programmable controllers , Electronic controllers -- Design and construction
- Language: English
- Type: Thesis , Masters , MTech (Electrical Engineering)
- Identifier: vital:10817 , http://hdl.handle.net/10948/116 , Embedded computer systems -- Design and construction , Computer input-output equipment , Programmable controllers , Electronic controllers -- Design and construction
- Description: The use of embedded Internet systems is growing rapidly in the manufacturing sector. These systems allow the monitoring and controlling of plant machinery and manufactured items from a remote location via a standard Web interface. In a manufacturing environment, it is inevitable that long running processes will require support for dynamic reconfiguration because, for example, machines may fail, services may be moved or withdrawn and user requirements may change. In such an environment it is essential that the operation and architecture of such processes can be modified to reflect such changes. This research project will present methods and ideas for establishing a reconfigurable remote system by using standard 8-bit microcontrollers and reconfigurable hardware. It will allow a manufacturing process to be modified and changed within minutes without even having to be physically present at the location where the process is running.
- Full Text:
- Date Issued: 2003
Development of a language policy in a rural school
- Authors: Fumba, Zamumzi Norman
- Date: 2003
- Subjects: Language policy -- South Africa Language and education -- South Africa Education, Rural -- South Africa -- Peddie Black people -- Education -- South Africa Native language and education -- South Africa
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1940 , http://hdl.handle.net/10962/d1007798
- Description: The study was undertaken to observe and participate in the process and development of a language policy for a rural secondary school in Peddie in the Eastern Cape. This was done in collaboration with parents, learners, and teachers. The researcher acted as a researcher, facilitator and learner in the process that Iead to the final product. Twenty four learners were selected from Grade 8 to Grade 10. These learners formed three focus groups. A questionnaire and lesson observation were used to establish what was taking place in the school with regard to language practices and preferences by learners, teachers and parents. Lesson observations were recorded by a tape recorder. Outcomes are that Xhosa is the dominant language to which the learners are exposed. They only have the exposure to 'chunks' of English in class and when they read magazines, newspapers and listening to radio and TV. Teachers code switch. This is supported by both learners and their parents. Parents want their children to improve performance by being taught in the medium of a language they understand well enough. The study shows different perceptions about the language that should be used as LOLT. Parents in the study favour English as LOLT, while parents in general favour Xhosa. This view is also held by both teachers and learners. At a conscious level when teachers and learners talk about the language to be used as LOLT, they favour English, but when they are faced with the reality of the class they are ambivalent, hence they code switch. The study finally reports on the divergent views of the parents, on one hand, and those of the teachers and the learners on the other hand. The divergence will be resolved in a workshop, part of the broader process of school language policy research, which is beyond the scope of the research reported in the thesis. The final product, in the form of the school language policy, will then be drafted for presentation to the School Governing Body (SGB) for ratification and writing up process.
- Full Text:
- Date Issued: 2003
- Authors: Fumba, Zamumzi Norman
- Date: 2003
- Subjects: Language policy -- South Africa Language and education -- South Africa Education, Rural -- South Africa -- Peddie Black people -- Education -- South Africa Native language and education -- South Africa
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1940 , http://hdl.handle.net/10962/d1007798
- Description: The study was undertaken to observe and participate in the process and development of a language policy for a rural secondary school in Peddie in the Eastern Cape. This was done in collaboration with parents, learners, and teachers. The researcher acted as a researcher, facilitator and learner in the process that Iead to the final product. Twenty four learners were selected from Grade 8 to Grade 10. These learners formed three focus groups. A questionnaire and lesson observation were used to establish what was taking place in the school with regard to language practices and preferences by learners, teachers and parents. Lesson observations were recorded by a tape recorder. Outcomes are that Xhosa is the dominant language to which the learners are exposed. They only have the exposure to 'chunks' of English in class and when they read magazines, newspapers and listening to radio and TV. Teachers code switch. This is supported by both learners and their parents. Parents want their children to improve performance by being taught in the medium of a language they understand well enough. The study shows different perceptions about the language that should be used as LOLT. Parents in the study favour English as LOLT, while parents in general favour Xhosa. This view is also held by both teachers and learners. At a conscious level when teachers and learners talk about the language to be used as LOLT, they favour English, but when they are faced with the reality of the class they are ambivalent, hence they code switch. The study finally reports on the divergent views of the parents, on one hand, and those of the teachers and the learners on the other hand. The divergence will be resolved in a workshop, part of the broader process of school language policy research, which is beyond the scope of the research reported in the thesis. The final product, in the form of the school language policy, will then be drafted for presentation to the School Governing Body (SGB) for ratification and writing up process.
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- Date Issued: 2003
Effect of photoperiod on sexual development, growth and production of quail (coturnix coturnix japonica)
- Authors: De Jager, Pieter Herodes
- Date: 2003
- Subjects: Quails , Quails -- Growth , Quails -- Effect of light on , Photoperiodism
- Language: English
- Type: Thesis , Masters , MTech (Agricultural Management)
- Identifier: vital:10969 , http://hdl.handle.net/10948/227 , Quails , Quails -- Growth , Quails -- Effect of light on , Photoperiodism
- Description: The aim of the study was to determine the effect of photoperiod on production of quail in South Africa. Day old chicks were randomly divided into two groups. One group (n=74) received continuous light (LL) while the other group (n=77) received 13 h of light (LD) per day. Traits measured were sexual characteristics (age at sexual maturity and testis weight, egg production and egg weight) and growth (body weight) development in males and females respectively. Significant differences in growth existed between sexes; females were 171.44±17.15 and 182.91±17.75 g compared to the 151.77±13.20 and 155.00±16.86 g for males in both LL and LD groups respectively. Both males and females in the LL group initially outperformed the LD group in growth rate but, by day 72 the LD group had compensated and were 4.6% heavier than the LL group. A similar trend was observed for sexual maturity between the LL and LD groups. However, photoperiod did significantly influence initial egg production in favour of the LL group. The LL group had 80% of the females in production by day 44 compared to the 60% of the LD group. The initial egg weight of the LL group was 14 % higher than those of the LD group. Quail subjected to continuous light attained earlier sexual maturity and production with lower final weight compared to quail subjected to an intermediate photoperiod. The application of a longer photoperiod would therefore favour an egg production system.
- Full Text:
- Date Issued: 2003
- Authors: De Jager, Pieter Herodes
- Date: 2003
- Subjects: Quails , Quails -- Growth , Quails -- Effect of light on , Photoperiodism
- Language: English
- Type: Thesis , Masters , MTech (Agricultural Management)
- Identifier: vital:10969 , http://hdl.handle.net/10948/227 , Quails , Quails -- Growth , Quails -- Effect of light on , Photoperiodism
- Description: The aim of the study was to determine the effect of photoperiod on production of quail in South Africa. Day old chicks were randomly divided into two groups. One group (n=74) received continuous light (LL) while the other group (n=77) received 13 h of light (LD) per day. Traits measured were sexual characteristics (age at sexual maturity and testis weight, egg production and egg weight) and growth (body weight) development in males and females respectively. Significant differences in growth existed between sexes; females were 171.44±17.15 and 182.91±17.75 g compared to the 151.77±13.20 and 155.00±16.86 g for males in both LL and LD groups respectively. Both males and females in the LL group initially outperformed the LD group in growth rate but, by day 72 the LD group had compensated and were 4.6% heavier than the LL group. A similar trend was observed for sexual maturity between the LL and LD groups. However, photoperiod did significantly influence initial egg production in favour of the LL group. The LL group had 80% of the females in production by day 44 compared to the 60% of the LD group. The initial egg weight of the LL group was 14 % higher than those of the LD group. Quail subjected to continuous light attained earlier sexual maturity and production with lower final weight compared to quail subjected to an intermediate photoperiod. The application of a longer photoperiod would therefore favour an egg production system.
- Full Text:
- Date Issued: 2003
Effects of small-scale water movement on the settlement and growth rates of the brown mussel Perna perna, on the south-east coast of South Africa
- Authors: Mathagu, Tendamudzimu Titus
- Date: 2003
- Subjects: Mussels -- South Africa , Perna -- South Africa , Perna -- Growth
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5682 , http://hdl.handle.net/10962/d1005368 , Mussels -- South Africa , Perna -- South Africa , Perna -- Growth
- Description: The effects of small scale (cm) water movement on the settlement and growth rates of the brown mussel Perna perna were investigated on the south-east coast of South Africa (33°28′S, 27°10′E). L-shaped metal baffles attached to the substratum decreased the erosion rates of cement balls and it was concluded that the baffles decreased the water flow rate around cement balls. These L-shaped baffles were then used to decrease water flow rates around mussel patches and pot-scouring pads used as artificial substrata for the settlement of P.perna larvae. Anova indicated that settlement rate varied by date and site while decreased water flow rate significantly increased larval settlement (p<0.05), only on the site and day that had the overall highest number of settlers. Mussels in the low zone had significantly higher growth rates than those in the high zone. Decreased water flow rate significantly increased mussel growth rate in the lower zone (Anova, p<0.05), while it did not have a significant effect on the mussel in the high zone. Thus water flow manipulation increased growth rates in the zone, which already had high growth rate. It was concluded that small-scale (cm) water flow patterns have an effect on both Perna perna settlement and growth rates, but only under specific conditions. Larval settlement rate was significantly increased by water flow manipulation on the site and day that had the highest number of settlers. Growth rates were significantly increased by decreased water flow rate only in the low zone, where growth rates are the highest. Although water flow was manipulated in both zones its effect in the high zone was insignificant (Anova) compared to other factors affecting growth rates at this tidal level.
- Full Text:
- Date Issued: 2003
- Authors: Mathagu, Tendamudzimu Titus
- Date: 2003
- Subjects: Mussels -- South Africa , Perna -- South Africa , Perna -- Growth
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5682 , http://hdl.handle.net/10962/d1005368 , Mussels -- South Africa , Perna -- South Africa , Perna -- Growth
- Description: The effects of small scale (cm) water movement on the settlement and growth rates of the brown mussel Perna perna were investigated on the south-east coast of South Africa (33°28′S, 27°10′E). L-shaped metal baffles attached to the substratum decreased the erosion rates of cement balls and it was concluded that the baffles decreased the water flow rate around cement balls. These L-shaped baffles were then used to decrease water flow rates around mussel patches and pot-scouring pads used as artificial substrata for the settlement of P.perna larvae. Anova indicated that settlement rate varied by date and site while decreased water flow rate significantly increased larval settlement (p<0.05), only on the site and day that had the overall highest number of settlers. Mussels in the low zone had significantly higher growth rates than those in the high zone. Decreased water flow rate significantly increased mussel growth rate in the lower zone (Anova, p<0.05), while it did not have a significant effect on the mussel in the high zone. Thus water flow manipulation increased growth rates in the zone, which already had high growth rate. It was concluded that small-scale (cm) water flow patterns have an effect on both Perna perna settlement and growth rates, but only under specific conditions. Larval settlement rate was significantly increased by water flow manipulation on the site and day that had the highest number of settlers. Growth rates were significantly increased by decreased water flow rate only in the low zone, where growth rates are the highest. Although water flow was manipulated in both zones its effect in the high zone was insignificant (Anova) compared to other factors affecting growth rates at this tidal level.
- Full Text:
- Date Issued: 2003