Reproductive conflicts in honeybee colonies
- Pirk, Christian Walter Werner
- Authors: Pirk, Christian Walter Werner
- Date: 2002
- Subjects: Honeybee -- Reproduction
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5755 , http://hdl.handle.net/10962/d1005443
- Description: In advanced eusocial hymenopteran societies workers have ovaries and can lay eggs, but are unable to mate. Workers are more related to their own offspring than to every other member of the colony. So worker reproduction contains both worker-worker and worker-queen conflict. The queen- worker conflict is discussed elsewhere, but if the queen mates with more than two males, worker policing should be selected to lower potential conflicts. However in the Cape honeybee it was predicted that worker policing is absent or less expressed than in other honeybee subspecies, because workers produce female offspring thelytokously. So laying workers and their offspring are nearly genetically identical, which results in the fact that other workers are as related to workers derived from eggs laid by the queen as laid by a worker. However, worker reproduction may be costly and therefore worker policing could be an evolutionary adaptation in the Cape honeybee to lower the costs derived from laying worker activity. Indeed, Cape honeybee colonies show efficient egg removal behaviour, suggesting that other factors like colony efficiency could favour egg removal behaviour. Since egg removal behaviour is a colony phenomenon, factors that affect colony performance could also affect egg removal behaviour. Egg removal behaviour was considerably affected by environmental changes, indicating that other tasks have a higher priority than egg removal behaviour. Thousands of queenright colonies of the neighbouring subspecies (A. m. scutellata) were taken over by laying A. m. capensis workers, showing that A. m. capensis workers are facultative social parasites. These observations strongly indicate that laying workers of A. m. capensis are able to evade worker policing and the inhibitory effects of the queen pheromones, but what potential strategies could these laying workers use to increase the survival of their eggs and evade the queen? On the one hand, egg removal behaviour is variable. One behavioural strategy of laying workers to achieve successful reproduction could be that they lay during periods with low egg removal behaviour. On the other hand, the inhibitory effect of the queen’s pheromones diminishes with distance. Maybe the level of egg removal also depends, like the inhibitory effect of the queen pheromones, on the distance from the queen. Indeed, further away from the queen the effect of the queen pheromone and the level of egg removal is reduced, making successful worker reproduction possible. In both subspecies, A. m. capensis and A. m. scutellata, egg removal behaviour is reduced further away from the queen. In the case of A. m. scutellata egg removal is lacking further away from the queen. This explains why colonies of scutellata are so prone to takeovers by laying Cape honeybee workers. One question in the context of parasitic Cape honeybees is how they manage to get into the host colony. One way could be that they get into the colonies during a natural colony merger which is common in African bees. Two unrelated colonies merged and it took them only 24 hours to show effective integration. Because both colonies are unrelated, the potential reproductive conflict among workers should be more strongly expressed than in a normal colony, which is not the result of a merger. Therefore, the effect of nestmate recognition for eggs on the egg removal behaviour was investigated. The results suggest that workers recognise the origin of an egg and that the standard policing experiments overestimate the level of egg removal and only represent relative values. Moreover, the results show that colony specific components on the eggs are more important than a postulated queen egg marking pheromone. Finally, for the first time empirical evidence from a population of the parasitic laying Cape honeybee workers, invading thousands of colonies of A. m. scutellata in northern South Africa, for a short-sighted selection theory is presented.
- Full Text:
- Date Issued: 2002
- Authors: Pirk, Christian Walter Werner
- Date: 2002
- Subjects: Honeybee -- Reproduction
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5755 , http://hdl.handle.net/10962/d1005443
- Description: In advanced eusocial hymenopteran societies workers have ovaries and can lay eggs, but are unable to mate. Workers are more related to their own offspring than to every other member of the colony. So worker reproduction contains both worker-worker and worker-queen conflict. The queen- worker conflict is discussed elsewhere, but if the queen mates with more than two males, worker policing should be selected to lower potential conflicts. However in the Cape honeybee it was predicted that worker policing is absent or less expressed than in other honeybee subspecies, because workers produce female offspring thelytokously. So laying workers and their offspring are nearly genetically identical, which results in the fact that other workers are as related to workers derived from eggs laid by the queen as laid by a worker. However, worker reproduction may be costly and therefore worker policing could be an evolutionary adaptation in the Cape honeybee to lower the costs derived from laying worker activity. Indeed, Cape honeybee colonies show efficient egg removal behaviour, suggesting that other factors like colony efficiency could favour egg removal behaviour. Since egg removal behaviour is a colony phenomenon, factors that affect colony performance could also affect egg removal behaviour. Egg removal behaviour was considerably affected by environmental changes, indicating that other tasks have a higher priority than egg removal behaviour. Thousands of queenright colonies of the neighbouring subspecies (A. m. scutellata) were taken over by laying A. m. capensis workers, showing that A. m. capensis workers are facultative social parasites. These observations strongly indicate that laying workers of A. m. capensis are able to evade worker policing and the inhibitory effects of the queen pheromones, but what potential strategies could these laying workers use to increase the survival of their eggs and evade the queen? On the one hand, egg removal behaviour is variable. One behavioural strategy of laying workers to achieve successful reproduction could be that they lay during periods with low egg removal behaviour. On the other hand, the inhibitory effect of the queen’s pheromones diminishes with distance. Maybe the level of egg removal also depends, like the inhibitory effect of the queen pheromones, on the distance from the queen. Indeed, further away from the queen the effect of the queen pheromone and the level of egg removal is reduced, making successful worker reproduction possible. In both subspecies, A. m. capensis and A. m. scutellata, egg removal behaviour is reduced further away from the queen. In the case of A. m. scutellata egg removal is lacking further away from the queen. This explains why colonies of scutellata are so prone to takeovers by laying Cape honeybee workers. One question in the context of parasitic Cape honeybees is how they manage to get into the host colony. One way could be that they get into the colonies during a natural colony merger which is common in African bees. Two unrelated colonies merged and it took them only 24 hours to show effective integration. Because both colonies are unrelated, the potential reproductive conflict among workers should be more strongly expressed than in a normal colony, which is not the result of a merger. Therefore, the effect of nestmate recognition for eggs on the egg removal behaviour was investigated. The results suggest that workers recognise the origin of an egg and that the standard policing experiments overestimate the level of egg removal and only represent relative values. Moreover, the results show that colony specific components on the eggs are more important than a postulated queen egg marking pheromone. Finally, for the first time empirical evidence from a population of the parasitic laying Cape honeybee workers, invading thousands of colonies of A. m. scutellata in northern South Africa, for a short-sighted selection theory is presented.
- Full Text:
- Date Issued: 2002
The use of interactive computer simulations to engender conceptual changes about wave motion
- Authors: Jacob, Sunny
- Date: 2001
- Subjects: Computer simulation
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1921 , http://hdl.handle.net/10962/d1007409
- Description: Computers are expensive equipment which most schools in South Africa cannot afford to use as an instructional tool in the same way as they are being used in affluent schools in the countly and in the western world. In this study a computer was used as a demonstration tool to help learners to visualise the different aspects of wave motion with the aid of interactive computer simulations. The study investigated how learners alter their intuitive notions of wave motion after experiencing the common teaching techniques in township schools, and then by observing interactive computer simulations. Data was collected by means of field notes, observation, questionnaires and in-depth semi-structured interviews with the participation of twelve Grade 9 learners in a secondary school over a three-week period. A combination of qualitative and quantitative methods was used in the study and the data was analysed within an interpretive framework. A detailed analysis revealed that interactive computer simulations could bring about positive conceptual changes in learners, especially in the micro level aspects of wave motion. The inexperience of the learners in a discovery method of learning and a learner centred approach of teaching seemed to interfere with the teaching techniques. To a considerable extent, language problems also hindered the revelation of conceptualisation.In writing this report of the research study J agree wilh Squires and McDougall (1994: 12) that it is difficult to use a non-interactive medium (paper-based text) to report on the interactive medium of computer simulations, as written words cannot bring out all the essential aspects of interactive computer simulations.
- Full Text:
- Date Issued: 2001
- Authors: Jacob, Sunny
- Date: 2001
- Subjects: Computer simulation
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1921 , http://hdl.handle.net/10962/d1007409
- Description: Computers are expensive equipment which most schools in South Africa cannot afford to use as an instructional tool in the same way as they are being used in affluent schools in the countly and in the western world. In this study a computer was used as a demonstration tool to help learners to visualise the different aspects of wave motion with the aid of interactive computer simulations. The study investigated how learners alter their intuitive notions of wave motion after experiencing the common teaching techniques in township schools, and then by observing interactive computer simulations. Data was collected by means of field notes, observation, questionnaires and in-depth semi-structured interviews with the participation of twelve Grade 9 learners in a secondary school over a three-week period. A combination of qualitative and quantitative methods was used in the study and the data was analysed within an interpretive framework. A detailed analysis revealed that interactive computer simulations could bring about positive conceptual changes in learners, especially in the micro level aspects of wave motion. The inexperience of the learners in a discovery method of learning and a learner centred approach of teaching seemed to interfere with the teaching techniques. To a considerable extent, language problems also hindered the revelation of conceptualisation.In writing this report of the research study J agree wilh Squires and McDougall (1994: 12) that it is difficult to use a non-interactive medium (paper-based text) to report on the interactive medium of computer simulations, as written words cannot bring out all the essential aspects of interactive computer simulations.
- Full Text:
- Date Issued: 2001
The vegetation potential of natural rangelands in the mid-Fish River Valley, Eastern Cape, South Africa: towards a sustainable and acceptable management system
- Birch, Natalie Vivienne Evans
- Authors: Birch, Natalie Vivienne Evans
- Date: 2001
- Subjects: Vegetation and climate -- South Africa -- Eastern Cape Vegetation dynamics -- South Africa -- Eastern Cape Vegetation surveys -- South Africa -- Eastern Cape Land -- South Africa -- Eastern Cape Rangelands -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:4186 , http://hdl.handle.net/10962/d1003754
- Description: Desertification is the diminution or destruction of the biological potential of land, and can lead ultimately to desert-like conditions. The vegetation of southern Africa is claimed to have altered over the past 100 years and much of the change is attributed to pastoral practice. In recent years however there has been much debate around the issue of the deterioration and loss of productivity of the natural rangelands, specifically those under communal management. It is one thing to claim that the vegetation has changed but quite another to produce data and analyses to show this unequivocally. Furthermore it is generally difficult to determine the nature and extent of change in natural ecosystems, as one does not know what the optimal base-line conditions should be. For this reason emphasis has been placed on developing models of potential or expected vegetation. By comparing a model of potential or expected vegetation with that of the contemporary vegetation, areas that deviate from expectation can be identified, in so doing providing evidence of the direction of change in the rangelands under various management treatments. The objective of this study was to determine shifts in the vegetation under different land-use treatments, by developing a technique to predict the potential vegetation of an area. In order to explore the nature and extent of degradation at the landscape scale a study site was selected where a range of land-use and rangeland management practices could be studied in parallel. The mid-Fish River valley consists of three markedly different units of land management, namely commercial rangelands, communal rangelands and nature conservation areas. The vegetation within the mid-Fish River valley falls within the Thicket biome and consists of three main vegetation types namely, Short Succulent Thicket, Medium Succulent Thicket and Mesic Bushclump Savanna. The creation of this potential vegetation model was dependent on the direct gradient analysis approach of relating the community patterns with environmental variables. To achieve this, floristic information was collected at sites along a topographical-moisture gradient. A Canonical Correspondence Analysis (CCA) between the environmental variables and the plant communities produced a classification from which the conditions normally associated with the major plant communities were predicted. When projected as a digital map, the qualifying sites provided a testable hypothesis of the potential vegetation. The results of this study showed a definite grazing gradient, which reflects a change from a more mesic environment towards a more arid environment with an increase in utilisation pressure. The predictive vegetation model proved to be useful for predicting the occurrence of the valley thicket communities within the Eastern Cape.
- Full Text:
- Date Issued: 2001
- Authors: Birch, Natalie Vivienne Evans
- Date: 2001
- Subjects: Vegetation and climate -- South Africa -- Eastern Cape Vegetation dynamics -- South Africa -- Eastern Cape Vegetation surveys -- South Africa -- Eastern Cape Land -- South Africa -- Eastern Cape Rangelands -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:4186 , http://hdl.handle.net/10962/d1003754
- Description: Desertification is the diminution or destruction of the biological potential of land, and can lead ultimately to desert-like conditions. The vegetation of southern Africa is claimed to have altered over the past 100 years and much of the change is attributed to pastoral practice. In recent years however there has been much debate around the issue of the deterioration and loss of productivity of the natural rangelands, specifically those under communal management. It is one thing to claim that the vegetation has changed but quite another to produce data and analyses to show this unequivocally. Furthermore it is generally difficult to determine the nature and extent of change in natural ecosystems, as one does not know what the optimal base-line conditions should be. For this reason emphasis has been placed on developing models of potential or expected vegetation. By comparing a model of potential or expected vegetation with that of the contemporary vegetation, areas that deviate from expectation can be identified, in so doing providing evidence of the direction of change in the rangelands under various management treatments. The objective of this study was to determine shifts in the vegetation under different land-use treatments, by developing a technique to predict the potential vegetation of an area. In order to explore the nature and extent of degradation at the landscape scale a study site was selected where a range of land-use and rangeland management practices could be studied in parallel. The mid-Fish River valley consists of three markedly different units of land management, namely commercial rangelands, communal rangelands and nature conservation areas. The vegetation within the mid-Fish River valley falls within the Thicket biome and consists of three main vegetation types namely, Short Succulent Thicket, Medium Succulent Thicket and Mesic Bushclump Savanna. The creation of this potential vegetation model was dependent on the direct gradient analysis approach of relating the community patterns with environmental variables. To achieve this, floristic information was collected at sites along a topographical-moisture gradient. A Canonical Correspondence Analysis (CCA) between the environmental variables and the plant communities produced a classification from which the conditions normally associated with the major plant communities were predicted. When projected as a digital map, the qualifying sites provided a testable hypothesis of the potential vegetation. The results of this study showed a definite grazing gradient, which reflects a change from a more mesic environment towards a more arid environment with an increase in utilisation pressure. The predictive vegetation model proved to be useful for predicting the occurrence of the valley thicket communities within the Eastern Cape.
- Full Text:
- Date Issued: 2001
Does drafting beat "bleeding"? : an action research investigation into the introduction of a cognitivist process approach to the teaching of writing at senior secondary level
- McKellar, Elizabeth Jennifer Kelk
- Authors: McKellar, Elizabeth Jennifer Kelk
- Date: 1996
- Subjects: Action research in education English language -- Writing -- Study and teaching (Secondary)
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1499 , http://hdl.handle.net/10962/d1003381
- Description: In this study an attempt is made to describe and illuminate the attitude of both pupils and teachers to the introduction of a cognitivist process approach to the teaching of written literacy in one standard in a multi-cuI tural Eastern Cape Model C secondary school. Because the cognitivist process approach to the teaching of written literacy was to complement already existing strategies for the teaching of written literacy, the research took the form of collaborative action research in three standard nine English classrooms. Teacher- and pupil diaries were the main means of data collection. Two spirals of action research were conducted in an attempt to identify difficulties and improve practice. Diaries and discussion revealed a positive response to the drafting, revision and editing processes which researchers had already identified as the processes which skilled writers use in creating text. Acknowledgement of the benefits to be derived from peer response as audience was also established. Anomalies relating to the grouping of pupils for peer-editing were found to be a key issue in determining the relative success of the project. Difficulties were also found to exist in the ability of some of the pupils to engage effectively in peer-peer and teacher-peer negotiation of text. Possible reasons for these difficulties have been identified , and further research into the nature of the inherent power relationships which exist implicitly in a multi-cultural educational setting and impede negotiation would be necessary to appreciate fully the difficulties experienced.
- Full Text:
- Date Issued: 1996
- Authors: McKellar, Elizabeth Jennifer Kelk
- Date: 1996
- Subjects: Action research in education English language -- Writing -- Study and teaching (Secondary)
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1499 , http://hdl.handle.net/10962/d1003381
- Description: In this study an attempt is made to describe and illuminate the attitude of both pupils and teachers to the introduction of a cognitivist process approach to the teaching of written literacy in one standard in a multi-cuI tural Eastern Cape Model C secondary school. Because the cognitivist process approach to the teaching of written literacy was to complement already existing strategies for the teaching of written literacy, the research took the form of collaborative action research in three standard nine English classrooms. Teacher- and pupil diaries were the main means of data collection. Two spirals of action research were conducted in an attempt to identify difficulties and improve practice. Diaries and discussion revealed a positive response to the drafting, revision and editing processes which researchers had already identified as the processes which skilled writers use in creating text. Acknowledgement of the benefits to be derived from peer response as audience was also established. Anomalies relating to the grouping of pupils for peer-editing were found to be a key issue in determining the relative success of the project. Difficulties were also found to exist in the ability of some of the pupils to engage effectively in peer-peer and teacher-peer negotiation of text. Possible reasons for these difficulties have been identified , and further research into the nature of the inherent power relationships which exist implicitly in a multi-cultural educational setting and impede negotiation would be necessary to appreciate fully the difficulties experienced.
- Full Text:
- Date Issued: 1996
An investigation into the need for environmental information in South Africa: a case study of the Enviro Facts Project
- Authors: Paxton, Linda Janet
- Date: 1994
- Subjects: Enviro facts project Environmental education -- South Africa
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1611 , http://hdl.handle.net/10962/d1003493
- Description: Growing awareness of the environmental risks associated with modernity has contributed to an increasing demand for information about the environment. Conservation and other environmental organisations receive many such requests for information. The research reported here was motivated first, by the view that these requests presented an opportunity for environmental education, and second, by a concern that this potential was not being realised. The research question was thus "How can environmental education be supported by optimally responding to requests for environmental information?" It is argued that social change is the raison d' etre of environmental education as a response to environmental risks. Further, it is proposed that this might be best achieved through an approach described here as socially critical environmental education. The study comprised an historical review of the Enviro Facts Project, a recent attempt to meet the need for environmental information; a questionnaire survey; interviews; and workshops. Results were collected from 115 questionnaire responses; 23 telephone interviews and nine face-to-face interviews; and six workshops. The research design was participative. It aimed to answer the research question through co-developing practical solutions with participants. Further, it endeavoured to be of practical relevance to those participants. Conclusions are drawn as to how the research question might be answered. Recommendations are made as follows. Responses to environmental information requests might best support socially critical environmental education through an approach characterised by: * a recognition of the importance of responding optimally to environmental information requests, as well as a recognition of existing structures and resource materials with which to respond; * the mobilisation of those structures and resource materials through, for example, the effective marketing and distribution of resource materials; informed and focused networking to make existing resources and capacities more accessible; and the effective use of libraries to provide environmental information; * the enhancement of the capacities of local sources of environmental information. The findings of this study could usefully inform both resource development in environmental education, and those who in their line of work respond to requests for environmental information.
- Full Text:
- Date Issued: 1994
- Authors: Paxton, Linda Janet
- Date: 1994
- Subjects: Enviro facts project Environmental education -- South Africa
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1611 , http://hdl.handle.net/10962/d1003493
- Description: Growing awareness of the environmental risks associated with modernity has contributed to an increasing demand for information about the environment. Conservation and other environmental organisations receive many such requests for information. The research reported here was motivated first, by the view that these requests presented an opportunity for environmental education, and second, by a concern that this potential was not being realised. The research question was thus "How can environmental education be supported by optimally responding to requests for environmental information?" It is argued that social change is the raison d' etre of environmental education as a response to environmental risks. Further, it is proposed that this might be best achieved through an approach described here as socially critical environmental education. The study comprised an historical review of the Enviro Facts Project, a recent attempt to meet the need for environmental information; a questionnaire survey; interviews; and workshops. Results were collected from 115 questionnaire responses; 23 telephone interviews and nine face-to-face interviews; and six workshops. The research design was participative. It aimed to answer the research question through co-developing practical solutions with participants. Further, it endeavoured to be of practical relevance to those participants. Conclusions are drawn as to how the research question might be answered. Recommendations are made as follows. Responses to environmental information requests might best support socially critical environmental education through an approach characterised by: * a recognition of the importance of responding optimally to environmental information requests, as well as a recognition of existing structures and resource materials with which to respond; * the mobilisation of those structures and resource materials through, for example, the effective marketing and distribution of resource materials; informed and focused networking to make existing resources and capacities more accessible; and the effective use of libraries to provide environmental information; * the enhancement of the capacities of local sources of environmental information. The findings of this study could usefully inform both resource development in environmental education, and those who in their line of work respond to requests for environmental information.
- Full Text:
- Date Issued: 1994
A hermeneutical study of the Midrashic influences of biblical literature on the narrative modes, aesthetics, and ethical concerns in the novels of George Eliot
- Authors: Law-Viljoen, Bronwyn
- Date: 1993
- Subjects: Eliot, George, 1819-1880 -- Criticism and interpretation Eliot, George, 1819-1880 -- Language Eliot, George, 1819-1880 - Style Eliot, George, 1819-1880. Daniel Deronda Eliot, George, 1819-1880. Felix Holt Eliot, George, 1819-1880. Adam Bede Eliot, George, 1819-1880. Mill on the Floss Midrash -- History and criticism Midrash -- Hermeneutics Prophecy in literature Judaism in literature Jews in literature Symbolism in literature
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2236 , http://hdl.handle.net/10962/d1002279
- Description: The thesis will examine the influence of Biblical literature on some of the novels of George Eliot. In doing so it will consider the following aspects of Eliot criticism: current theoretical debate about the use of midrash; modes of discourse and narrative style; prophetic language and vision; the influence of Judaism and Jewish exegetical methods on Adam Bede, "The Lifted Veil", The Mill on the Floss, Felix Holt, and Daniel Deronda. Literary critics have, for a long time, been interested in the influence of the Bible and Biblical hermeneutics on literature and the extent to which Biblical narratives and themes are used typologically and allegorically in fiction has been well researched. In this regard, the concept of midrash is not a new one in literary theory. It refers both to a genre of writing and to an ancient Rabbinic method of exegesis. It has, however, been given new meaning by literary critics and theoriticians such as Frank Kermode, Harold Bloom, and Jacques Derrida. In The Genesis of Secrecy, Kermode gives a new nuance to the word and demonstrates how it may be used to read not only Biblical stories but secular literature as well. It is an innovative, self-reflexive, and intricate hermeneutic processs which has been used by scholars such as Geoffrey Hartman and Sanford Budick, editors of Midrash and Literature, a seminal work in this thesis. Eliot's interest in Judaism and her fascination with religion, religious writing, and religious characters are closely connected to her understanding of the novelist's role as an interpreter of stories. In this regard, the prophetic figure as poet, seer, and interpreter of the past, present, and future of society is of special significance. The thesis will investigate Eliot's reinterpretation of this important Biblical type as well as her retelling of Biblical stories. It will attempt to establish the extent to which Eliot's work may be called midrash, and enter the current debate on how and why literary works have been and can be interpreted. It will address the questions of why Eliot, who abjures normative religious faith, has such a profound interest in the Bible, how the Bible serves her creative purposes, why she is interested in Judaism, and to what extent the latter informs and permeates her novels.
- Full Text:
- Date Issued: 1993
- Authors: Law-Viljoen, Bronwyn
- Date: 1993
- Subjects: Eliot, George, 1819-1880 -- Criticism and interpretation Eliot, George, 1819-1880 -- Language Eliot, George, 1819-1880 - Style Eliot, George, 1819-1880. Daniel Deronda Eliot, George, 1819-1880. Felix Holt Eliot, George, 1819-1880. Adam Bede Eliot, George, 1819-1880. Mill on the Floss Midrash -- History and criticism Midrash -- Hermeneutics Prophecy in literature Judaism in literature Jews in literature Symbolism in literature
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2236 , http://hdl.handle.net/10962/d1002279
- Description: The thesis will examine the influence of Biblical literature on some of the novels of George Eliot. In doing so it will consider the following aspects of Eliot criticism: current theoretical debate about the use of midrash; modes of discourse and narrative style; prophetic language and vision; the influence of Judaism and Jewish exegetical methods on Adam Bede, "The Lifted Veil", The Mill on the Floss, Felix Holt, and Daniel Deronda. Literary critics have, for a long time, been interested in the influence of the Bible and Biblical hermeneutics on literature and the extent to which Biblical narratives and themes are used typologically and allegorically in fiction has been well researched. In this regard, the concept of midrash is not a new one in literary theory. It refers both to a genre of writing and to an ancient Rabbinic method of exegesis. It has, however, been given new meaning by literary critics and theoriticians such as Frank Kermode, Harold Bloom, and Jacques Derrida. In The Genesis of Secrecy, Kermode gives a new nuance to the word and demonstrates how it may be used to read not only Biblical stories but secular literature as well. It is an innovative, self-reflexive, and intricate hermeneutic processs which has been used by scholars such as Geoffrey Hartman and Sanford Budick, editors of Midrash and Literature, a seminal work in this thesis. Eliot's interest in Judaism and her fascination with religion, religious writing, and religious characters are closely connected to her understanding of the novelist's role as an interpreter of stories. In this regard, the prophetic figure as poet, seer, and interpreter of the past, present, and future of society is of special significance. The thesis will investigate Eliot's reinterpretation of this important Biblical type as well as her retelling of Biblical stories. It will attempt to establish the extent to which Eliot's work may be called midrash, and enter the current debate on how and why literary works have been and can be interpreted. It will address the questions of why Eliot, who abjures normative religious faith, has such a profound interest in the Bible, how the Bible serves her creative purposes, why she is interested in Judaism, and to what extent the latter informs and permeates her novels.
- Full Text:
- Date Issued: 1993
Geological control of aquifer properties of the Chuniespoort Group in the Klip River Valley and Natalspruit Basin, Transvaal
- Foster, Michael Benedict John
- Authors: Foster, Michael Benedict John
- Date: 1988 , 2013-03-08
- Subjects: Hydrogeology -- South Africa -- Transvaal , Aquifers -- South Africa -- Transvaal , Water supply -- South Africa -- Transvaal
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4881 , http://hdl.handle.net/10962/d1013338
- Description: The aquifer of the study area occupies an escarpment and low lying limestone plain, and exhibits a Vaal River type karst. The four dolomitic formations present fall into two distinct aquifer forming types; chert poor units and chert rich units. The chert poor units of the Oaktree and Lyttelton Formations were deposited in a subtidal environment and were probably dolomi tised in a migrating schizohaline environment during basin subsidence and shoreline trangression. The chert rich units of the Monte Christo and Eccles Formations were deposited in the shallow subtidal to supratidal zones and the interbedded chert and dolomites may result from minor cyclical marine trangressions and regressions or be a geochemical response to the periodic flooding of freshwater carbonate and flats and tidal deltas. These fundamental geological differences are reflected in correspondingly different development of karst. Transmissive zones in the chert poor units are generally discrete solution features in massive dolomite, 1 m to 2 m thick. Transmissive zones in the chert rich units comprise thick (up to 60 m) and extremely weathered chert with a high void content resulting from the dissolution of carbonate material. The relative importance of various geological features to the development of the karst was assessed using information from two extensive hydrogeological investigations of the area. From the results it bas been concluded that lithostratigraphy, including the occurrence of palaeokarstic horizons, is the major control of aquifer properties. All other geological features are of lesser importance but may nevertheless be associated with enhanced transmissivi ties in any given unit. Faults and lineaments are the structural features most widely associated with highly transmissive zones. The knowledge gained in this study is applicable elsewhere as the principal hydrogeological characteristics of the study area are common to many of the Chuniespoort Group aquifers in the Pretoria - Witwatersrand - Vereeniging Region.
- Full Text:
- Date Issued: 1988
- Authors: Foster, Michael Benedict John
- Date: 1988 , 2013-03-08
- Subjects: Hydrogeology -- South Africa -- Transvaal , Aquifers -- South Africa -- Transvaal , Water supply -- South Africa -- Transvaal
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4881 , http://hdl.handle.net/10962/d1013338
- Description: The aquifer of the study area occupies an escarpment and low lying limestone plain, and exhibits a Vaal River type karst. The four dolomitic formations present fall into two distinct aquifer forming types; chert poor units and chert rich units. The chert poor units of the Oaktree and Lyttelton Formations were deposited in a subtidal environment and were probably dolomi tised in a migrating schizohaline environment during basin subsidence and shoreline trangression. The chert rich units of the Monte Christo and Eccles Formations were deposited in the shallow subtidal to supratidal zones and the interbedded chert and dolomites may result from minor cyclical marine trangressions and regressions or be a geochemical response to the periodic flooding of freshwater carbonate and flats and tidal deltas. These fundamental geological differences are reflected in correspondingly different development of karst. Transmissive zones in the chert poor units are generally discrete solution features in massive dolomite, 1 m to 2 m thick. Transmissive zones in the chert rich units comprise thick (up to 60 m) and extremely weathered chert with a high void content resulting from the dissolution of carbonate material. The relative importance of various geological features to the development of the karst was assessed using information from two extensive hydrogeological investigations of the area. From the results it bas been concluded that lithostratigraphy, including the occurrence of palaeokarstic horizons, is the major control of aquifer properties. All other geological features are of lesser importance but may nevertheless be associated with enhanced transmissivi ties in any given unit. Faults and lineaments are the structural features most widely associated with highly transmissive zones. The knowledge gained in this study is applicable elsewhere as the principal hydrogeological characteristics of the study area are common to many of the Chuniespoort Group aquifers in the Pretoria - Witwatersrand - Vereeniging Region.
- Full Text:
- Date Issued: 1988
An analysis of non-white transport requirements in an Eastern Cape urban area
- Authors: Viljoen, John
- Date: 1978
- Subjects: Buses -- South Africa -- Eastern Cape Black people -- Transportation -- South Africa -- Eastern Cape Transportation, Automotive -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: vital:807 , http://hdl.handle.net/10962/d1007265
- Description: From Preface: The following research is centred around the Grahamstown non-white urban transportation problem. The bus service under consideration is owned and operated by the Grahamstown Municipality and is attached to the City Fire Department. It caters only for non-white commuters by operating fourteen buses, which carry approximately 1 200 000 people per year. As such, the difficulties encountered by this transport service should be generally, though not entirely, applicable only to relatively small non-white transport undertakings. The aims of this research are threefold: 1. to establish the environment within which transport undertakings operate, the structure of the undertaking in response to this environment and the problems which such undertakings encounter in their daily operations ; 2. by analysing in detail a specific transport service, an attempt has been made to delineate problem areas in both the cost and revenue structures, and to ascertain the degree of management awareness of the existence of these problems ; and 3. to determine the social impact of this transport operation and to evaluate all aspects of the service in relation to commuters, business and social needs and wants. Unfortunately, an attempt to extend this type of research to further Eastern Cape urban areas was unsuccessful due to the refusal by certain transport undertakings and government bodies to provide essential information.
- Full Text:
- Date Issued: 1978
- Authors: Viljoen, John
- Date: 1978
- Subjects: Buses -- South Africa -- Eastern Cape Black people -- Transportation -- South Africa -- Eastern Cape Transportation, Automotive -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: vital:807 , http://hdl.handle.net/10962/d1007265
- Description: From Preface: The following research is centred around the Grahamstown non-white urban transportation problem. The bus service under consideration is owned and operated by the Grahamstown Municipality and is attached to the City Fire Department. It caters only for non-white commuters by operating fourteen buses, which carry approximately 1 200 000 people per year. As such, the difficulties encountered by this transport service should be generally, though not entirely, applicable only to relatively small non-white transport undertakings. The aims of this research are threefold: 1. to establish the environment within which transport undertakings operate, the structure of the undertaking in response to this environment and the problems which such undertakings encounter in their daily operations ; 2. by analysing in detail a specific transport service, an attempt has been made to delineate problem areas in both the cost and revenue structures, and to ascertain the degree of management awareness of the existence of these problems ; and 3. to determine the social impact of this transport operation and to evaluate all aspects of the service in relation to commuters, business and social needs and wants. Unfortunately, an attempt to extend this type of research to further Eastern Cape urban areas was unsuccessful due to the refusal by certain transport undertakings and government bodies to provide essential information.
- Full Text:
- Date Issued: 1978
Die nywerheidsopleiding van vakleerlinge en hulle relatiewe invloed op die besetting van die arbeidsmark oor die afgelope tien jaar, met inbegrip van die toepaslike aspekte op die grensgebied
- Authors: De Beer, David Petrus
- Date: 1975
- Subjects: Apprentices -- Training -- South Africa -- Eastern Cape , Apprentices -- Labor market -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: vital:1082 , http://hdl.handle.net/10962/d1011032 , Apprentices -- Training -- South Africa -- Eastern Cape , Apprentices -- Labor market -- South Africa -- Eastern Cape
- Full Text:
- Date Issued: 1975
- Authors: De Beer, David Petrus
- Date: 1975
- Subjects: Apprentices -- Training -- South Africa -- Eastern Cape , Apprentices -- Labor market -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: vital:1082 , http://hdl.handle.net/10962/d1011032 , Apprentices -- Training -- South Africa -- Eastern Cape , Apprentices -- Labor market -- South Africa -- Eastern Cape
- Full Text:
- Date Issued: 1975
Aspects of the biology of aestivation in Bulinus (Physopsis) africanus (Krauss) (Gastropoda, Pulmonata)
- Authors: Heeg, J. (Jan)
- Date: 1973
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:21054 , http://hdl.handle.net/10962/6178
- Description: Aestivation, a period of dormancy during hot, dry conditions, is known to occur in both the Prosobranchia and the Pulmonata among freshwater Gastropoda. While there have been numerous accounts, mainly by field ecologists concerned with bilharziasis control, of the survival value of aestivation in the Gastropoda, little is known of its underlying physiological mechanisms. Results of investigations into the physiological basis of aestivation in the freshwater Prosobranchia, confined to the family Ampulariidae, have been conflicting, fundamental differences having been shown to exist between different species of the genus Pila . Only a single comprehensive study, that by von Brand and his coworkers on the planorbid snail Australorbis glabratus*, forms the basis of our knowledge of the aestivation process in the aquatic Pulmonata. In view of the conflicting results obtained in investigations on freshwater Prosobranchia, the general applicability of the findings for Australorbis glabratus to other freshwater Pulmonata was open to question. The present investigation on the planorbid snail Bulinus (Physopsis) afriaanus, a species known to be a successful aestivator, was prompted by the obvious need for a further comprehensive study on an aquatic pulmonate species . The results presented here show that aestivation in this species is a definite physiological state, characterised by a depression of the metabolic rate, which not only aids in husbanding the snails I metabolic resources. during the enforced starvation which must necessarily accompany aestivation, but also constitutes a form of resistance adaptation to the transient high temperatures which aestivating snails are bound to encounter. Loss of body water is shown to be important in initiating aestivation, but it is also the factor most likely to prove lethal during the course of aestivation. The results confirm and extend the earlier findings for Australorbis glabratus. The results are discussed in the context of our present knowledge of aestivation in other Gastropoda, both aquatic and terrestrial, and also in relation to other forms of resistance adaptation. As expected, the investigation raises more questions than it answers, thus directions for further research, arising out of the present findings, are suggested.
- Full Text:
- Date Issued: 1973
- Authors: Heeg, J. (Jan)
- Date: 1973
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:21054 , http://hdl.handle.net/10962/6178
- Description: Aestivation, a period of dormancy during hot, dry conditions, is known to occur in both the Prosobranchia and the Pulmonata among freshwater Gastropoda. While there have been numerous accounts, mainly by field ecologists concerned with bilharziasis control, of the survival value of aestivation in the Gastropoda, little is known of its underlying physiological mechanisms. Results of investigations into the physiological basis of aestivation in the freshwater Prosobranchia, confined to the family Ampulariidae, have been conflicting, fundamental differences having been shown to exist between different species of the genus Pila . Only a single comprehensive study, that by von Brand and his coworkers on the planorbid snail Australorbis glabratus*, forms the basis of our knowledge of the aestivation process in the aquatic Pulmonata. In view of the conflicting results obtained in investigations on freshwater Prosobranchia, the general applicability of the findings for Australorbis glabratus to other freshwater Pulmonata was open to question. The present investigation on the planorbid snail Bulinus (Physopsis) afriaanus, a species known to be a successful aestivator, was prompted by the obvious need for a further comprehensive study on an aquatic pulmonate species . The results presented here show that aestivation in this species is a definite physiological state, characterised by a depression of the metabolic rate, which not only aids in husbanding the snails I metabolic resources. during the enforced starvation which must necessarily accompany aestivation, but also constitutes a form of resistance adaptation to the transient high temperatures which aestivating snails are bound to encounter. Loss of body water is shown to be important in initiating aestivation, but it is also the factor most likely to prove lethal during the course of aestivation. The results confirm and extend the earlier findings for Australorbis glabratus. The results are discussed in the context of our present knowledge of aestivation in other Gastropoda, both aquatic and terrestrial, and also in relation to other forms of resistance adaptation. As expected, the investigation raises more questions than it answers, thus directions for further research, arising out of the present findings, are suggested.
- Full Text:
- Date Issued: 1973
Absenteeism in the footwear industry in South Africa
- Authors: Townsend, A C
- Date: 1967
- Subjects: Absenteeism (Labor) -- South Africa , Footwear industry -- South Africa , Employees -- South Africa , South Africa -- Industries
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3384 , http://hdl.handle.net/10962/d1013408
- Description: From Introduction: During the past three decades or more, the study of absenteeism in industry has been carried on in many different ways, by numerous investigators and in a wide range of industries. The purpose of such studies has varied; sometimes they have been stimulated by purely academic interest and have sought to investigate the relationship between absenteeism and various other measurable factors in the work situation such as age, race, sex, length of service and wage rates. Most studies, however, have been prompted by the urgent necessity to determine whether an absence problem existed within a specific factory, community or industry and to discover some effective means of dealing with it. Most studies have been empirical and pragmatic as has befitted their intentions. Inevitably, those who have conducted studies of the latter type have asked two questions (a) how do the absence rates emerging from this investigation compare with those from other studies and (b) are they 'normal' or 'abnormal'? In other words, does the data which has been gathered indicate the existence of an absence problem? The main purpose of this monograph is to demonstrate that the Gross Absence Rate is not an effective basis for the discovery of answers to either of these questions. It will seek, in other words, to demonstrate the truth of the following fundamental postulate: THE GROSS ABSENCE RATE IS NOT, IN ITSELF, A SUFFICIENT BASIS FOR THE COMPARISON OF THE ABSENCE BEHAVIOUR OF ONE GROUP OF WORKERS WITH THAT OF ANOTHER OR WITH A PRE-ESTABLISHED NORM, NOR IS IT AN ADEQUATE INDICATOR OF THE PRESENCE OR OTHERWISE OF AN ABSENCE PROBLEM AMONG ANY GIVEN GROUP OF WORKERS. Although this study will include some account of investigations into the relationship between absence rates and various socio-economic factors, it will do so primarily in order to seek support for the above postulate.
- Full Text:
- Date Issued: 1967
- Authors: Townsend, A C
- Date: 1967
- Subjects: Absenteeism (Labor) -- South Africa , Footwear industry -- South Africa , Employees -- South Africa , South Africa -- Industries
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3384 , http://hdl.handle.net/10962/d1013408
- Description: From Introduction: During the past three decades or more, the study of absenteeism in industry has been carried on in many different ways, by numerous investigators and in a wide range of industries. The purpose of such studies has varied; sometimes they have been stimulated by purely academic interest and have sought to investigate the relationship between absenteeism and various other measurable factors in the work situation such as age, race, sex, length of service and wage rates. Most studies, however, have been prompted by the urgent necessity to determine whether an absence problem existed within a specific factory, community or industry and to discover some effective means of dealing with it. Most studies have been empirical and pragmatic as has befitted their intentions. Inevitably, those who have conducted studies of the latter type have asked two questions (a) how do the absence rates emerging from this investigation compare with those from other studies and (b) are they 'normal' or 'abnormal'? In other words, does the data which has been gathered indicate the existence of an absence problem? The main purpose of this monograph is to demonstrate that the Gross Absence Rate is not an effective basis for the discovery of answers to either of these questions. It will seek, in other words, to demonstrate the truth of the following fundamental postulate: THE GROSS ABSENCE RATE IS NOT, IN ITSELF, A SUFFICIENT BASIS FOR THE COMPARISON OF THE ABSENCE BEHAVIOUR OF ONE GROUP OF WORKERS WITH THAT OF ANOTHER OR WITH A PRE-ESTABLISHED NORM, NOR IS IT AN ADEQUATE INDICATOR OF THE PRESENCE OR OTHERWISE OF AN ABSENCE PROBLEM AMONG ANY GIVEN GROUP OF WORKERS. Although this study will include some account of investigations into the relationship between absence rates and various socio-economic factors, it will do so primarily in order to seek support for the above postulate.
- Full Text:
- Date Issued: 1967
"The congregational way" : an historical study of the congregational doctrine of the church
- Authors: De Gruchy, John Wesley
- Date: 1961
- Subjects: Congregational churches , Congregationalism
- Language: English
- Type: Thesis , Bachelor , BDiv
- Identifier: vital:1276 , http://hdl.handle.net/10962/d1013317
- Description: From Preface: In this Ecumenical Age it is necessary that each Christian Communion consider again its particular doctrine of the Church, and restate it for the benefit of the whole Body of Christ. This Thesis is an attempt to show some historical and theological facets of the traditional Congregational doctrine of the Church. However, it must be stated that a full exposition of Congregational ecclesiology is an impossible task for any thesis. Firstly, inherent within Congregationalism is the fear of dogmatizing about matters of faith and practice. It has expressed itself in Statements and Declarations but always with the qualification that these things are 'commonly believed amongst us' Therefore, Congregationalism, while it has a characteristic ecclesiology, has never formulated a rigid pattern of Churchmanship which has to be adhered to by all the Churches. Secondly, a full study of Congregational ecclesiology would entail the study of the practices of every Congregational Church through the ages. That is an impossible task. Therefore, we have been confined to available material; but material which nevertheless expresses what we would regard as traditional congregationalism. Thirdly, a study of this nature must be content merely to state, however critically, what Congregationalists have believed about the Church at various times in the history of Congregationalism. It is impossible to convey the pulse and feeling of the life of a Congregational Church, for it is very important in seeking to understand any Churchmanship, not only to understand its theological form and structure, but also to experience its ' koinonia ' in its common life and worship.
- Full Text:
- Date Issued: 1961
- Authors: De Gruchy, John Wesley
- Date: 1961
- Subjects: Congregational churches , Congregationalism
- Language: English
- Type: Thesis , Bachelor , BDiv
- Identifier: vital:1276 , http://hdl.handle.net/10962/d1013317
- Description: From Preface: In this Ecumenical Age it is necessary that each Christian Communion consider again its particular doctrine of the Church, and restate it for the benefit of the whole Body of Christ. This Thesis is an attempt to show some historical and theological facets of the traditional Congregational doctrine of the Church. However, it must be stated that a full exposition of Congregational ecclesiology is an impossible task for any thesis. Firstly, inherent within Congregationalism is the fear of dogmatizing about matters of faith and practice. It has expressed itself in Statements and Declarations but always with the qualification that these things are 'commonly believed amongst us' Therefore, Congregationalism, while it has a characteristic ecclesiology, has never formulated a rigid pattern of Churchmanship which has to be adhered to by all the Churches. Secondly, a full study of Congregational ecclesiology would entail the study of the practices of every Congregational Church through the ages. That is an impossible task. Therefore, we have been confined to available material; but material which nevertheless expresses what we would regard as traditional congregationalism. Thirdly, a study of this nature must be content merely to state, however critically, what Congregationalists have believed about the Church at various times in the history of Congregationalism. It is impossible to convey the pulse and feeling of the life of a Congregational Church, for it is very important in seeking to understand any Churchmanship, not only to understand its theological form and structure, but also to experience its ' koinonia ' in its common life and worship.
- Full Text:
- Date Issued: 1961
The sorption of Hydrochloric Acid and Potassium Hydroxide by mohair and wool
- Bamford, Graeme Reginald Ernest
- Authors: Bamford, Graeme Reginald Ernest
- Date: 1959
- Subjects: Hydrochloric acid -- Absorption and adsorption , Hydroxides -- Absorption and adsorption , Wool , Mohair
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4452 , http://hdl.handle.net/10962/d1009503
- Description: The main object of the present investigation has been to establish a titration curve for mohair keratin and to compare it with similar data for wool, to determine whether the differences in physical and chemical properties could be attributed in any way to the acidic and basic character of these fibres. As shown in subsequent discussion such measurements provide extremely useful information regarding the chemical structure of proteins in general, and in the technical fields involving processes such as wool scouring, carbonizing and dyeing. The study has been extended to include certain modified wools, i.e. photochemically damaged, and oxidized keratin. The most successful contribution to the titration data of wool keratin is the work of Steinhardt and Harris and subsequent authors have tended to adopt their procedures without modification. In the present study attempts have been made to obtain a clearer understanding of the fundamental processes. New techniques and analytical methods have been introduced to improve the accuracy of the measurements.
- Full Text:
- Date Issued: 1959
- Authors: Bamford, Graeme Reginald Ernest
- Date: 1959
- Subjects: Hydrochloric acid -- Absorption and adsorption , Hydroxides -- Absorption and adsorption , Wool , Mohair
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4452 , http://hdl.handle.net/10962/d1009503
- Description: The main object of the present investigation has been to establish a titration curve for mohair keratin and to compare it with similar data for wool, to determine whether the differences in physical and chemical properties could be attributed in any way to the acidic and basic character of these fibres. As shown in subsequent discussion such measurements provide extremely useful information regarding the chemical structure of proteins in general, and in the technical fields involving processes such as wool scouring, carbonizing and dyeing. The study has been extended to include certain modified wools, i.e. photochemically damaged, and oxidized keratin. The most successful contribution to the titration data of wool keratin is the work of Steinhardt and Harris and subsequent authors have tended to adopt their procedures without modification. In the present study attempts have been made to obtain a clearer understanding of the fundamental processes. New techniques and analytical methods have been introduced to improve the accuracy of the measurements.
- Full Text:
- Date Issued: 1959