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An integrated approach to aspects of coastal dune planning and management along a portion of the Eastern Cape coastal zone

  • Authors: Hellström, Gavin B
  • Date: 1995
  • Subjects: Coastal zone management -- South Africa , Sand dune ecology -- South Africa
  • Language: English
  • Type: Thesis , Masters , MSc
  • Identifier: vital:4197 , http://hdl.handle.net/10962/d1003766 , Coastal zone management -- South Africa , Sand dune ecology -- South Africa
  • Description: Ecological evaluation techniques have been used to classify or evaluate the relative conservation worthiness of a portion of the Eastern Cape coastal zone from Cannon Rocks to Port Alfred. A system-based approach, using a basic GIS, was used to compare three aspects of the coastal zone. Two existing planning documents (EMATEK/s Coastal Vegetation Importance Rating plan and CPA's Cape Coastal Conservation plan) were statistically compared - based primarily on the size and number of the landscape fragments (environmental criteria polygons). The resultant plan, an Intermediate Sensitivity Class map, was further integrated with the biophysical aspect of the coastal zone - coastal dunes. The final map is the product of these overlays to be used as a-working overlay for coastal zone decision-making. This is an Environmental Sensitivity map, which has no particular direct reference to any particular biophysical criteria, which categorizes the coastal zone according to the environmental sensitivity or conservation worthiness of the site. The categories are listed according to a sliding-scale of sensitivity or worthiness. There is, however, it strong association between the final map and the vegetation status of the coastline, as a direct result of the vegetation rating map and indirectly from the perception based coastal conservation plan. The formation of most assessment or evaluation plans are based on the vegetation status of the area. This map can be overlayed over the particular stretch of the coastline which it covers and the particular conservation status noted. There are numerous techniques available for assessment and evaluation each having their own specific merits and advantages. This plan, however, is a first attempt at integrating other specific plans into a single working document for the coastal zone manager.
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  • Date Issued: 1995

An investigation into the influence of an inset programme on teacher cognitions

  • Authors: Bell, David Ian
  • Date: 1995
  • Subjects: Teachers -- In-service training -- South Africa Teachers -- South Africa
  • Language: English
  • Type: Thesis , Masters , MEd
  • Identifier: vital:1608 , http://hdl.handle.net/10962/d1003490
  • Description: This study was based upon a concern about the quality of education in South Africa and a concern about the quality of NGO and other INSET interventions. Many organisations purport to address the issues of education, most of them doing so from the very comfortable position of the moral high ground (the position adopted where the political - correctness of the intervention outweighs the quality and impact) rather than from the position of having the capacity to deliver a quality service (a position from which they can effect genuine educational transformation toward quality education for all). With the rapid social, political and educational changes taking place at present, it is necessary for most organisations to assess their positions in respect of their ability to effect quality changes within the broad educational terrain. This study is an attempt to investigate the influence of one particular programme, that of the Centre for Cognitive Development, as it effects changes in teacher cognitions. It is argued that teachers are the catalysts for and agents of educational and social change and that these changes require the thinking and beliefs of individual teachers which inform their practices and behaviours, both personally and as professionals, to be addressed. These beliefs need to be critically reflected upon by the teachers themselves and through this process of reflection, teachers need to be empowered to take responsibility for the quality of teaching and learning. This concern was addressed by selecting a sample of teachers from within one such INSET intervention and through the use of a questionnaire, investigating whether teachers cognitions had changed, as a result of the INSET programme. It was hypothesised that changes in teacher cognitions would occur as a result of the INSET programme and that these cognitive or gestalt shifts could be categorised as Attributional shifts, Efficacy shifts, shifts in teachers perceived Locus of Control (Control Beliefs) and changes in general Pedagogic Beliefs. The statistical analysis of the data indicated varying degrees and trends of significant change. However, the complexity of the social context of teaching and the impact of this on teacher beliefs and cognitions, especially those of teachers who have been most affected (disempowered) by social and personal oppression, cannot be under-estimated and even minor shifts reflected in this investigation should be seen as positive changes none-the-less.
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  • Date Issued: 1995

An investigation of environmental knowledge among two rural black communities in Natal

An investigation of reactions directed towards the synthesis of 2-methyl-2-(methylthio)propanal oxime

  • Authors: Whittaker, Ruth Eleanor
  • Date: 1995
  • Subjects: Pesticides -- Synthesis , Insecticides , Aldicarb -- Synthesis
  • Language: English
  • Type: Thesis , Masters , MSc
  • Identifier: vital:4322 , http://hdl.handle.net/10962/d1004980 , Pesticides -- Synthesis , Insecticides , Aldicarb -- Synthesis
  • Description: The processes leading to the formation of 2-methyl-2-(methylthio)propanal oxime, known industrially as aldicarb oxime, have been studied. The three stages of the synthesis, viz., chlorination, thiomethylation and oximation have been thoroughly investigated, with the aim of optimising the yield and purity of aldicarb oxime. Attention has been focused on the chlorination step, and the effects of altering various conditions have been determined; the reaction has been carried out in the absence and presence of heat, solvent and buffer, and the extent of chlorine addition has also been varied. These studies have led to some improvement in the yield for this step. Several simple and inexpensive methods for purifying contaminated batches of aldicarb oxime have also been examined. Possible aldicarb oxime contaminants, identified by GLC and GC-MS analysis, have been synthesised for use as chromatographic and spectroscopic standards, and confirmation of the presence of a number of these contaminants has been achieved. Aldehyde trimers have been found to be the primary contaminants present in aldicarb oxime and the thermal stability of these trimers, their corresponding monomers and aldicarb oxime itself has been studied using variable temperature ¹H NMR spectroscopy. Novel pyridine derivatives, with potential as aldicarb analogues, have been synthesised and characterised using spectroscopic methods.
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  • Date Issued: 1995

An investigation of the potential role of students in decision making in the management and administration of secondary schools : a case study

  • Authors: Chinsamy, Dhanasagren
  • Date: 1995
  • Subjects: Student participation in administration -- South Africa Student-administrator relationships -- South Africa
  • Language: English
  • Type: Thesis , Masters , MEd
  • Identifier: vital:1655 , http://hdl.handle.net/10962/d1003538
  • Description: As South Africa prepares to reconstruct its education system for a post-apartheid, democratic society, many facets of educational life will of necessity come under re-examination. One such area is that of school governance which traditionally was the domain of principals, teachers and more recently parents, with little, if any, input by students. After 1985, however, with the formation of the Congress of South African Students (CaSAS), backed by the National Education Co-ordinating Committee (NECC), the demand for student participation in the management of schools began to gain momentum. Parent-Teacher -Student Associations (PTSA's), although not recognised by the education authorities, were established in many black schools throughout the country. They afforded students the opportunity to become involved, as equal partners with teachers and parents, in decision-making in the management of secondary schools. During the past decade, however, the question of student participation in decision-making in the management of schools has become a point of controversy. The aim of this study was to investigate the potential role of students in decision-making in the administration and management of secondary schools. For this purpose case studies were conducted in two schools with active student participation in joint decision-making. The schools were selected after a preliminary investigation of the state of PTSA's in schools in the greater Durban area. Questionnaires and semi-structured interviews with teacher, parent and student representatives and principals and non-participant observation of PTSA meetings, workshops and social functions were used to survey attitudes and opinions pertinent to this study. The results of the study indicate that student participation in the management of schools is crucial for the creation of a climate of learning and teaching and that it is seen in itself as an integral part of the process of students' development. The study also points to the dilemma that students face in participating jointly with parents and teachers in decision-making while maintaining their autonomy. The recommendations that emerge from the study include the involvement of students as equal partners in decision-making in secondary schools, the establishment of Internal Disciplinary Committees in which students participate, the appointment of a member of staff as a liaison officer for student affairs with the task of establishing a Students' Representative Council (SRC) and the implementation of training programmes that would assist students in joint decision-making. The study acknowledges the existence of conflict between the participants but proposes that such conflict can be constructively addressed tbrough "creative consensus" that would benefit both the participants and the school. The researcher recommends that for the present, students should not be involved in any discussions of teacher misconduct and that students should not be entrusted with handling the finances of the school without teacher or parent supervision. However, in keeping with the developmental approach adopted in the study, it is envisaged that when the element of trust is developed between students and teachers, students would be allowed to participate in these sensitive areas of decision-making.
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  • Date Issued: 1995

Archaeopteris (Progymnospermopsida) from the Devonian of southern Africa

  • Authors: Anderson, Heidi M , Hiller, Norton , Gess, Robert W
  • Date: 1995
  • Language: English
  • Type: text , article
  • Identifier: http://hdl.handle.net/10962/72712 , vital:30102 , https://doi.org/10.1111/j.1095-8339.1995.tb02593.x
  • Description: Archaeopteris notosaria sp. nov. based on one fertile and numerous sterile leafy branches is described from the Grahamstown By-Pass locality, Witpoort Formation (Witteberg Group) Upper Devonian, and represents the first unequivocal record of the genus in southern Africa. This occurrence is used, in its palaeogeographical context, to support the suggestion that climatic gradients in Late Devonian times were less steep than they are at present.
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  • Date Issued: 1995

Art and investment a study on how investment in art affects the contemporary artist in South Africa

Art marketing and management

  • Authors: Anderson, Larna
  • Date: 1995
  • Subjects: Art -- Marketing Art portfolios Art -- Finance Art -- Economic aspects Community arts projects
  • Language: English
  • Type: Thesis , Masters , MFA
  • Identifier: vital:2392 , http://hdl.handle.net/10962/d1002188
  • Description: Formal art education equips students with skills to produce artworks. A formal art education may increase the opportunity for employment, however, art-related employment is very limited. Art graduates would be better equipped to market and manage art establishments or their own careers if art education were to be supplemented with basic business skills. Artists who wish to earn unsupplemented incomes from their art should undertake to acquire business acumen. This includes being presentable to the market place in attitude and appearance. It also includes aptitude in art, marketing and management. Role models and non-models of success and failure in business should also be observed. Art graduates should adopt applicable tried and tested business methods. Good marketing is a mix of business activities which identifies and creates consumer needs and wants. Marketing activities involve research, planning, packaging, pricing, promoting and distributing products and services to the public to create exchanges that satisfy individual and organisational objectives. Art products include artworks, frames, art books and art materials. Art-related services include the undertaking of commissions, consulting, teaching, free parking, convenient shopping hours, acceptance of mail or telephone orders, exhibitions, ease of contact, approval facilities, wrapping, delivery, installations (picture hanging), quotations, discounts, credit facilities, guarantees, trade-ins, adjustments and restorations. Good management is a mix of business activities which enables a venture to meet the challenges of supply and demand. There is a blueprint for management competence. The three dimensions of organisational competence are collaboration, commitment and creativity. Self-marketing and management is an expression of an artist's most creative being. It is that which can ensure and sustain recognition and income. Artists, like other competent organisations and entrepreneurs from the private sector, should operate with efficient manufacturing, marketing, management and finance departments. They are also equally important and therefore demand equal attention. Artistic skill together with business acumen should equip the artist to successfully compete in the market place. There are no short-cuts to becoming an artist but there are short-cuts to becoming a known and financially stable artist. Understanding marketing and management could mean the difference between waiting in poverty and frustration for a "lucky break" (which may only happen after an artists's death) and taking control. Success should be perpetuated through continuous effort.
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  • Date Issued: 1995

Assessing penetration enhances for topical corticosteroids

  • Authors: Smith, Eric W , Haigh, John M
  • Date: 1995
  • Language: English
  • Type: Book chapter
  • Identifier: vital:6442 , http://hdl.handle.net/10962/d1006629
  • Description: From introduction: Topical corticosteroids have been used for a wide range of dermatological conditions for the last 4 decades. For many years the topical delivery system was a relatively simple cream or ointment base, with little thought given to improving the formulation as far as drug delivery was concerned. The main emphasis in the initial stages of development was on the alteration of the corticosteroid molecule, in an attempt to produce moieties with a higher intrinsic topical effect with lower mineralocorticoid side effects. Once this avenue of research was exhausted, attention was placed on the lipophilicity of the molecule with the production of various types of esters in an attempt to produce molecules which would pass through the stratum corneum (SC) with reasonable ease. In recent years the nature of the semisolid drug delivery base has received considerable attention.2-5The nature of the vehicle has a profound effect on the rate of release of the topical corticosteroid from the formulation and its passage through the SC. One of the most important aspects of the formulation of the base is the inclusion of substances which aid this trads-SC diffusion, the so-called penetration enhancers.6The modes of action of the various different types of penetration enhancers are reviewed elsewhere in this book. The best method for the assessment of the release of corticosteroids from topical formulations is obviously the clinical tri~. Clinical trials, however, are laborious, costly, and difficult to mount. Patients suffering from dermatological complaints are not ideal subjects for the testing of topical corticosteroid formulations as it is difficult to obtain standardized lesions which are necessary for the comparison of results between formulations. Alternatively, a number of in vitro models exist for this type of assessment, but it is often problematic to obtain correlation with the in vivo situation.
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  • Date Issued: 1995

Background Information for Wage Bargaining

  • Authors: NALEDI
  • Date: 1995
  • Subjects: NALEDI
  • Language: English
  • Type: text
  • Identifier: http://hdl.handle.net/10962/151343 , vital:39057
  • Description: This booklet’contains information to assist unions in the coming wage round. It was prepared as an information package for a wage bargaining workshop. It begins with a section that reviews economic trends, including growth, unemployment and inflation. At the end of the booklet is a more detailed article on inflation taken from the South African Labour Bulletin, showing why the official inflation rate underestimates the level of inflation for the poor. The next section covers employer comments regarding the coming wage negotiations. It includes information on wage levels, the apartheid wage gap and estimates on labour as a proportion of costs. Lastly there is a calendar showing when Cosatu members, and their unions implement wage increases.
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  • Date Issued: 1995

Bacterial interaction in hide biodeterioration with special reference to selected Clostridium species

  • Authors: Thompson, Gillian Ann
  • Date: 1995
  • Subjects: Hides and skins -- Preservation Aerobic bacteria Pseudomonas aeruginosa Clostridium Halobacterium
  • Language: English
  • Type: Thesis , Doctoral , PhD
  • Identifier: vital:4041 , http://hdl.handle.net/10962/d1004102
  • Description: Animal hides are the basic raw material of the leather industry and they undergo rapid putrefaction unless "cured". This study investigated the role and interactive effects of three selected bacteria, Pseudomonas aeruginosa. Clostridium histoly ticum and Clostridium sporogenes in in-situ cattle hide degradation using a model system set up for the purpose. The system consisted of 3cm diameter hide pieces contained in sealed jars and sterilised by ethylene oxide to remove resident microbes and inactivate autolytic tissue enzymes. The inocula were prepared either as individual cultures or as combinations of two inocula or all three inocula. Degradative changes during storage at 30°C were measured for up to 8 days using ten different parameters. Initial trials confirmed that the selected inocula were readily isolated from raw hides and could outcompete resident populations to produce putrefactive decomposition. Growth rates and enzyme profiles of the organisms and the effects of nutrients and reductants on their relative denaturative effects were used to standardise the system. Trials on the effects of ethylene oxide indicated the suitability of the method for hide and collagen sterilisation. The findings of in-situ trials with the selected inocula confirmed previous studies of protein putrefaction in that a bacterial succession was evident involving aerobic proteolytic bacteria, micro-aerophilic proteolytic bacteria and strictly anaerobic amino acid degrading bacteria. However, this study showed that the micro-aerophilic collagenase producing C. histolyticum degraded hides at a far greater rate when inoculated on its own than when in the presence of either or both of the other two inocula. It also demonstrated a bacterial antagonism between the two clostridia in which C. sporogenes prevented degradative changes occurring for up to 4-6 days possibly due to cysteine production by C. sporogenes. These findings have implications for hide preservation since maintenance of aerobic conditions and suppression of spore outgrowth could be used to delay growth of collagenase producing clostridia. The use of C. sporogenes as a biocontrol agent is also postulated. The model system was also used to examine salted hides during storage and these studies indicated that Halobacteriaceae do not produce collagenase but that inadequately salted hides could possibly be subject to degradation by delsulfovibrios.
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  • Date Issued: 1995

Building a firm base for policy consensus statement

  • Authors: NEDLAC
  • Date: 1995
  • Subjects: NEDLAC
  • Language: English
  • Type: text
  • Identifier: http://hdl.handle.net/10962/151641 , vital:39156
  • Description: We have arrived at a very important stage in the development of our country - one that will be most testing and challenging for all of us. Our second revolution, so to speak, is only beginning. The Government of National Unity, has come a long way in addressing the key political questions. Advancement from here lies in our economic prerogative. We are all concerned with the major economic challenge that lies ahead. Sustainable economic growth, the creation of wealth and equity, the provision of jobs and basic needs underpin the need to provide mechanisms which will facilitate growth, development and delivery. But our concern is not limited to our domestic economy.
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  • Date Issued: 1995

Characterisation of the genome of Nudaurelia Omega Virus

  • Authors: Cox, Dermot
  • Date: 1995
  • Subjects: Imbrasia cytherea , RNA , Insects -- Viruses
  • Language: English
  • Type: Thesis , Masters , MSc
  • Identifier: vital:4023 , http://hdl.handle.net/10962/d1004083 , Imbrasia cytherea , RNA , Insects -- Viruses
  • Description: Nudaurelia co virus (Nco V) is a small RNA virus belonging to the Family Tetraviridae. Nco V was successfully isolated from field collected larvae of the pine emperor moth, Nudaurelia cytherea capensis. By polyacrylamide gel electrophoresis-it was possible Jo determine the size of the capsid proteins. Anti-NcoV antiserum was raised by inoculating a rabbit with purified virus. RNA was extracted from the purified virus using a phenol\chloroform extraction procedure. It was possible to separate the viral RNA into its constituent species using sucrose density gradient centrifugation. The sizes of both species of RNA was accurately determined by agarose gel electrophoresis. These sizes corresponded to the replicative form of the RNA which was extracted from infected host tissue. The absence of a poly(A) tract on the RNA was shown through poly(U) sepharose chromatography. Cell-free translation of the viral RNA elucidated the sizes of proteins encoded in vitro in a rabbit reticulocyte lysate system. Optimal conditions for in vitro translation of Nco V were determined for a range of conditions. Immunoprecipitaion of viral encoded proteins with anti-Nco V antiserum suggested that the putative coat protein of the virus was encoded by RNA 2, as a precursor polypeptide which underwent posttranslational cleavage. Reverse transcription - polymerase chain reaction (RT -PCR) was used to successfully produce a radiolabelled probe which could detect dot-blotted viral RNA. The efficacy of this probe in detecting the presence of Nco V RNA in infected tissue was also tested.
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  • Date Issued: 1995

Community policing : tentative steps towards true reconciliation : inaugural lecture delivered at Rhodes University

Complex interactions involving the Cape fig, Ficus sur Forsskål, and its associated insects

  • Authors: Zachariades, Costas
  • Date: 1995
  • Subjects: Insect-plant relationships Mutualism (Biology) Fig -- South Africa Fig wasp -- South Africa Ants Homoptera
  • Language: English
  • Type: Thesis , Doctoral , PhD
  • Identifier: vital:5655 , http://hdl.handle.net/10962/d1005338
  • Description: The inadequacy of arbitrarily classifying interactions between species as antagonistic, neutral or mutualistic has become clear in recent years. Both direct and indirect interactions between species can vary between mutualism and antagonism, depending on the intrinsic and extrinsic contexts of the interaction. This study investigated the characteristics of an ant-plant-homopteran interaction in southern Africa. The polyphagous homopteran Hilda patruelis (Tettigometridae) feeds primarily on the trunk-borne fruiting branches and figs of the Cape fig tree, Ficus sur, and produces honeydew which attracts tending ants. Ten of the sixteen ant species/species groups present on F. sur tended H. patruelis, with Pheidole megacephala the most frequent attendant. Ants attracted to F. sur by H. patruelis honeydew or other liquid food sources also preyed on insects on the tree, including adults of the small agaonid fig wasps whose larvae feed on the ovules in the developing figs. One fig wasp species (Ceratosolen capensis) is also the tree's only pollinator. No benefits to H. patruelis from being tended by ants were detected, either in terms of reduced parasitism, or predation by a lycaenid caterpillar. A P. megacephala colony foraging on a F. sur tree was found to receive a high proportion of its likely energy requirements from the tree, mainly in the form of H. patruelis honeydew, during periods when it was bearing fruit. It is probable that the H. patruelis-P. megacephala interaction constitutes a direct mutualism at times, but that benefits to the homopteran are intermittent or weak. Both H. patruelis and ants benefitted from F. sur, directly or indirectly, through the provision of food (and for some ants, nesting sites). The removal of phloem sap by H. patruelis did not detectably reduce the trees' reproductive output, either in terms of pollinator or viable seed production. The indirect effects of ant and H. patruelis presence on the F. sur trees were on average positive, as ants preyed disproportionately heavily on fig wasp species parasitic on or competing with the pollinator, thus increasing pollinator production. Effects of ant presence on seed production were not investigated, but have been demonstrated as beneficial elsewhere. However, there is great varatlon both in the composition of the wasp fauna arriving to oviposit at different crops, and in ant densities per fig, on several temporal and spatial scales. This results in high variability in the effects of ants on the pollinator and, through it, the tree, from positive to zero and potentially even negative. Despite this conditionality of beneficial outcomes for the tree, the mean effect of ants on the F. sur population studied was to increase pollinator production by up to nearly 20%. This study is among the few to have demonstrated an overall benefit to a plant of having homopteran-tending ants present on it.
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  • Date Issued: 1995

Comprehending strike action: the South African experience c.1950-1990 and the theoretical implications thereof

  • Authors: Wood, Geoffrey Thomas
  • Date: 1995
  • Subjects: Strikes and lockouts -- South Africa -- History Industrial relations -- South Africa -- History Labor unions -- South Africa -- History
  • Language: English
  • Type: Thesis , Doctoral , PhD
  • Identifier: vital:3319 , http://hdl.handle.net/10962/d1003107
  • Description: Regular strike action has become a central characteristic of the South African industrial relations system. Whilst in the 1950s strikes were mostly isolated outbursts of relatively short duration, strikes in the 1980s were challenges of unprecedented duration and intensity. It is argued that despite this dramatic change, reflecting a series of discontinuities in both the political and economic arenas, strike action in South Africa does follow distinct patterns, and can be ascribed to a combination of identifiable causes. Principal causal factors include wage aspirations, past experiences and the subjective interpretation thereof, and the role of the union movement. Contingent factors include the prevailing political climate, industrial relations legislation, the amount of information opposing sides possess of their adversaries' intentions as well as spatial issues, such as the internal dynamics of individual communities. Partially as a result of South Africa's political transformation, the late 1980s and early 1990s saw further changes in the industrial relations environment. Reflecting these developments, it is argued that a new type of trade unionism has developed, "coterminous unionism" . This will have far-reaching implications for the nature of industrial conflict. However, it falls fully within the theoretical parameters outlined in this thesis. Despite significant developments in social theory in the 1980s and 1990s, there have been few attempts accordingly to update theories of strike action. One of the objectives of this thesis has been to attempt such an update. It is hoped that the constructs developed will shed light on a widely prevalent form of social conflict, assist in the analysis of future outbreaks, and enable the identification of those situations where a high propensity to engage in strike action may exist.
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  • Date Issued: 1995

Confrontation, cooptation and collaboration : the response and reaction of the Labour Party of South Africa to Government Policy, 1965-1984

  • Authors: Du Pré, Roy Howard
  • Date: 1995
  • Subjects: South African Labour Party -- History Colored people (South Africa) -- Politics and government South Africa -- Politics and government -- 1948-1994
  • Language: English
  • Type: Thesis , Doctoral , PhD
  • Identifier: vital:2539 , http://hdl.handle.net/10962/d1002391
  • Description: The Labour Party was a prominent political party amongst coloured people for more than twenty-five years. Formed in 1965 to contest elections for the Coloured Persons' Representative Council (CRC), the Labour Party at the outset adopted an anti-apartheid, anti-separate representation and anti-eRe stance. During the first five years of its existence, the party tried to muster coloured support for its policies. Its promise to cripple the CRC by refusing to occupy seats in the council became the rallying call. The Labour Party won a majority of the elected seats in the first CRC election in 1969 but the government nominated progovernment candidates to all the nominated seats, depriving the Labour Party of an overall majority. Thwarted in their bid to "wreck" the CRC, Labour Party members instead took their seats in the council, vowing to destroy it from within. For the next five years the Labour Party pursued a policy of "confrontation. " By using a "boycott" strategy, it not only hamstrung the effective working of the CRC but thwarted the government in other areas of its "coloured" policy. In the 1975 election the Labour Party won an outright victory, giving it the power to cripple the CRC. However, it did not seize this opportunity. Its decision to "govern" in the CRC constituted a decisive step in the change from confrontation to cooptation. The Labour Party's continued support of the CRC drew widespread criticism from supporters and opponents alike. Its leaders tried to hold together a disaffected party and eventually agreed to the dissolution of the CRC in 1980 in an effort to paper over the cracks in party unity, and to forestall growing coloured opposition to the CRC at the next election. In 1983, the Labour Party displayed a decisive shift in its anti-separate representation stance by lending support to the tricameral system. By doing so, it laid itself open to the same charge of collaboration it had levelled at the other CRC parties. This thesis will examine the history of the Labour Party from its formation in 1965 as an anti-government party, to one of cooperation with its erstwhile opponent by 1984.
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  • Date Issued: 1995

Congress resolutions adopted at the meeting of the special national council

  • Authors: SADTU
  • Date: 1995
  • Subjects: SADTU
  • Language: English
  • Type: text
  • Identifier: http://hdl.handle.net/10962/176167 , vital:42667
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  • Date Issued: 1995

Constituent processes contributing to stress induced β-carotene accumulation in Dunaliella salina

  • Authors: Phillips, Lesley Gail
  • Date: 1995
  • Subjects: Dunaliella Carotenes Plants -- Effect of stress on
  • Language: English
  • Type: Thesis , Doctoral , PhD
  • Identifier: vital:5658 , http://hdl.handle.net/10962/d1005341
  • Description: The alga Dunaliella salina possesses the unique ability to accumulate up to 14 % of it's dry weight as β-carotene in response to stress conditions. This hyper-accumulation of β-carotene has led to the commercial exploitation of this alga for the biotechnological production of this important carotenoid. In order to maximise β-carotene production, a dual-stage process which separates the distinctive growth phase from the β-carotene accumulating stress phase has recently been patented. Preliminary laboratory studies showed that although stress factors such as high salinity and nutrient limitation enhance β-carotene accumulation in D. salina (± 10 pg.cell⁻¹), high light intensity was the single most important factor contributing to the induction of β-carotene accumulation in this alga (± 20 pg.cell⁻¹). Moreover, it was demonstrated that β-carotene accumulation can be further stimulated by exposing the alga to a combination of high light intensity, salt and nutrient stresses (± 30-60 pg.cell⁻¹). The response of D. salina to stress was shown to occur in two phases. The first phase occurred within 24 hours and was characterized most importantly by higher rates of β-carotene accumulation for all the stresses investigated. In cells exposed to multiple stress factors in mass culture, the β-carotene accumulation rate was as much as 9.5 pg.cell⁻¹.day⁻¹ in the first phase compared to only 3 pg.cell·day⁻¹ in the second phase. Since the rate of β-carotene accumulation was higher within the first 24 hours after exposure to stress, the first phase was considered crucial for stress-induced β-carotene accumulation. Characterization of this phase revealed that the stress response was multifaceted. Transition of cells from the growth stage to stress conditions was characterized by the following: 1) Change in cell volume. Hypersalinity caused cell shrinkage while cells exposed to nutrient limitation and/or high light intensity caused cells to swell. Restoration of cell volume was shown to occur within 8 hours for all stresses investigated. 2) Altered photosynthesis. Inhibition of both carbon fixation and oxygen evolution was demonstrated in cells immediately after exposure to multiple stress factors. 3) Production of abscisic acid. Intracellular ABA levels increased within 6-8 hours after exposure to all stresses investigated. The rise in intracellular ABA levels coincided with an increase or return to starting cell volume. High intracellular ABA levels were however transient and within 24 hours ABA began to partition into the culture medium. 4) Change in pigment composition. Changes in xanthophyll cycle pigment content was demonstrated soon after exposure to stress conditions. In hypersalinity shocked cells, initial epoxidation of zeaxanthin to violaxanthin and subsequent de-epoxidation to zeaxanthin occurred, whereas exposure to high stress resulted in an immediate and continued decrease in the epoxidation state indicating accumulation of zeaxanthin. A rapid rate of chlorophyll depletion was also demonstrated. In addition to the above responses a rapid decrease in growth rate during this phase was also noted. An interrelationship between cell volume change, ABA production, maintenance of xanthophyll cycle operation and β-carotene accumulation therefore appeared to exist. ABA production was shown to be stoichiometrically related to changes in xanthophyll content with r² = 0.84 and slope of the curve = 0.91 being achieved for high light stressed cells. This study therefore presents strong circumstantial evidence in support of a carotenoid origin for ABA in Dunaliella. In addition, enhanced β-carotene content was achieved by the application of exogenous ABA and related compounds suggesting a role for ABA as a regulator of the overall stress response. Furthermore, zeaxanthin accumulation was shown to be positively correlated ( r²≥ 0.81) to β-carotene accumulation for all the stresses investigated. The second phase was characterized by a return to homoeostasis of the physiological processes mentioned above, indicating acclimation of the cell to prevailing conditions. This stage was characterised by continued β-carotene accumulation and a decreased epoxidation state of the xanthophyll cycle which together appeared to sustain photosynthesis, allowing this organism to tolerate stress conditions.
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  • Date Issued: 1995

Constitution of the Building Workers Union

  • Authors: Building Workers Union (BWU)
  • Date: 1995
  • Subjects: BWU
  • Language: English
  • Type: text
  • Identifier: http://hdl.handle.net/10962/178651 , vital:42971
  • Description: This Trade Union shall be a body corporate with perpetual succession capable of entering into contractual and other relations and of suing and being sued in its own name and shall be an organisation not for gain.
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  • Date Issued: 1995
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