Thesis (MA)--University of Stellenbosch, 2006. / Bibliography. Also available via the Internet.

Thesis (M.A. (History)) - Rhodes University, 2009.

No description available.

Cette thèse décrit comment la morphologie et le polymorphisme de membranes en fluorure de poly(vinylidène) (PVDF) préparées par séparation de phase induite par la vapeur d'eau (VIPS) et par un non-solvant liquide peuvent être ajustés par la température à laquelle le PVDF est dissous (Tdis) pour former la solution de coulée. Les résultats montrent que Tdis présente une transition, notée comme la température de dissolution critique (Tcri), à partir de laquelle la morphologie et le polymorphisme des membranes changent radicalement. Ce phénomène observé pour les trois solvants, N-methyl-2-pyrrolidone (NMP), dimethylacetamide (DMAc), and N,M-dimethylformamide (DMF), et les non-solvants (eau et une série d'alcools) utilisés dans cette étude peut être considéré comme général. La cristallisation a lieu avant la démixtion L-L quelle que soit Tdis. Pour une Tdis supérieure à Tcri, les membranes se présentent sous forme de nodules (cristallite forme beta) dont la taille décroît lorsque Tdis diminue. Ce domaine a été dénommé "à grossissement libre" car les chaînes de polymère peuvent cristalliser librement pendant la séparation de phase. Pour une Tdis inférieure à Tcri, des membranes avec une structure bi-continue (cristallite forme alpha) sont obtenues. Ce domaine a été appelé "à grossissement empêché" dans la mesure où la séparation de phase s'accompagne d'une gélification. Nous avons démontré que la morphologie et le polymorphisme cristallin des membranes de PVDF peuvent ainsi être contrôlés par la Tdis et la vitesse d'échange avec le non-solvant. Ces résultats sont interprétés en termes d'auto germination et de compétition entre gélification, cristallisation et démixtion L-L. / This dissertation shows how the morphology and polymorphism of poly(vinylidene fluoride) (PVDF) membranes prepared by using vapor-induced phase separation (VIPS) and liquid-induced phase separation (LIPS) were tuned by varying the dissolution temperature at which PVDF was dissolved (Tdis) to form the casting solution. We observed a transition temperature denoted by critical dissolution temperature, Tcri, across which the morphology and polymorphism of membranes (obtained by VIPS) drastically changed. The phenomenon was considered as general, as a Tcri was observed for all the three solvents N-methyl-2-pyrrolidone (NMP), dimethylacetamide (DMAc), and N,N-dimethylformamide (DMF) and the non-solvents, water and a series of alcohols, used in the present study. No matter which Tdis we used, polymer crystallization occurred prior to the L-L demixing. With Tdis above Tcri, the prepared membranes were composed of nodules (mainly in beta crystalline form) and the size of polymer domains decreased as the Tdis decreased. Because the polymer chains could freely coarsen to a large domain during the phase separation, we called the system free coarsening. With Tdis below Tcri, membranes with lacy (bi-continuous) structure (mainly in alpha crystalline form) were obtained. Because the polymer solution gelled during the phase separation, we called the system hindered coarsening. It was proven that PVDF membrane morphology and crystalline polymorphs can be monitored by Tdis and the solvent-nonsolvent exchange rate. These results were discussed in terms of self-seeding effect and competition between the gelation, crystallisation and L-L demixing.

Leishmania (Leishmania) amazonenses está associada à leishmaniose cutânea difusa (DCL) e localizada (LCL). LCL se apresenta como uma lesão única com cura espontânea e DCL apresenta nódulos não ulcerativos que se espalham pela pele. Até o momento não se conhecem os fatores que influenciam na apresentação destas manifestações. A virulência do parasito tem sido associada com a capacidade de sobreviver no macrófago ativado. CD200 é uma glicoproteína reguladora que ativa o CD200R, gerando a inibição da resposta próinflamatória do macrófago. Recentemente foi demonstrado que no processo de infecção por L. (L.) amazonenses, há indução de CD200 no começo da infecção, aumentando a supervivência do parasito. O objetivo principal foi determinar a associação da expressão de CD200 na infecção de macrófagos com isolados de L. (L.) amazonenses associados à LCL ou DCL. Observamos que o aumento da expressão da proteína nos tempos avançados de infecção está relacionado com um aumento na infectividade dos isolados e um maior número de parasitos por célula infectada. / Leishmania (Leishmania) amazonenses is one of the etiologic agents of two forms of leishmaniasis: diffuse (DCL) and localized (LCL) cutaneous leishmaniasis. LCL is presents a unique ulcerated lesion and DCL multiple non-ulcerative nodules. Until now, it is not well known which factors influence the development of LCL or DCL. The parasites virulence has been associated with the ability to survive inside the activated macrophage. CD200 is a glycoprotein that interacts with CD200R inhibiting the proinflammatory response of the cell. Recently it was revealed during the infection process in macrophages L. (L.) amazonenses enhances CD200 expression in the early stages of infection resulting in the intracellular survival of amastigotes. The aim of this study was to determine the association between the induction of CD200 during infection with L. (L.) amazonenses isolates associated with LCL or DCL. An increase in CD200 expression was noteworthy in the late stages of infection, which was also related to a higher infectivity rate of L. (L.) amazonenses isolates.

Leishmania (Leishmania) amazonenses está associada à leishmaniose cutânea difusa (DCL) e localizada (LCL). LCL se apresenta como uma lesão única com cura espontânea e DCL apresenta nódulos não ulcerativos que se espalham pela pele. Até o momento não se conhecem os fatores que influenciam na apresentação destas manifestações. A virulência do parasito tem sido associada com a capacidade de sobreviver no macrófago ativado. CD200 é uma glicoproteína reguladora que ativa o CD200R, gerando a inibição da resposta próinflamatória do macrófago. Recentemente foi demonstrado que no processo de infecção por L. (L.) amazonenses, há indução de CD200 no começo da infecção, aumentando a supervivência do parasito. O objetivo principal foi determinar a associação da expressão de CD200 na infecção de macrófagos com isolados de L. (L.) amazonenses associados à LCL ou DCL. Observamos que o aumento da expressão da proteína nos tempos avançados de infecção está relacionado com um aumento na infectividade dos isolados e um maior número de parasitos por célula infectada. / Leishmania (Leishmania) amazonenses is one of the etiologic agents of two forms of leishmaniasis: diffuse (DCL) and localized (LCL) cutaneous leishmaniasis. LCL is presents a unique ulcerated lesion and DCL multiple non-ulcerative nodules. Until now, it is not well known which factors influence the development of LCL or DCL. The parasites virulence has been associated with the ability to survive inside the activated macrophage. CD200 is a glycoprotein that interacts with CD200R inhibiting the proinflammatory response of the cell. Recently it was revealed during the infection process in macrophages L. (L.) amazonenses enhances CD200 expression in the early stages of infection resulting in the intracellular survival of amastigotes. The aim of this study was to determine the association between the induction of CD200 during infection with L. (L.) amazonenses isolates associated with LCL or DCL. An increase in CD200 expression was noteworthy in the late stages of infection, which was also related to a higher infectivity rate of L. (L.) amazonenses isolates.

Although the history of the Eastern Cape has been recorded from the eighteenth century, virtually nothing has been written about the political entity known as the independent Republic of Ciskei (1981 – 1994). This hiatus in our history, coupled with the fact that many of the official records of that period have been destroyed, make it imperative that the role-players of the period be contacted and their evidence be recorded before it is lost to prosperity. This need has motivated the writing of the thesis. The thesis commences with a brief description of the early history and constitutional development of Ciskei. It then has a substantial chapter on Lennox Sebe, the ruler of Ciskei from 1973 to 1990, who is described as the catalyst of Gqozo’s coup d’état. This is followed by a short personal biography of Oupa Gqozo, and his rise to the position of Brigadier in the Ciskei army. On 4 March 1990 Gqozo led the coup by the Ciskei Defence Force that dethroned Sebe. At the outset he ruled in an exemplary manner, but after being misled by South African agents he turned against the African National Congress and his own people. When he established his own party, the African Democratic Movement, and re-instated the hated headman system, civil war followed in Ciskei. Separate chapters in the thesis relate the various traumatic events that occurred during Gqozo’s reign: the killing of Anton Guzana and Charles Sebe; the dismissal of the senior officers of the CDF; the strife during 1991/2; the Bhisho Massacre; its aftermath; the mutiny by the security forces and Gqozo’s resignation on 22 March 1994. The thesis concludes that although Brigadier Gqozo respected the rule of law, and was free of corruption, he was devoid of the necessary academic qualifications, experience and ability, including the necessary insight and foresight, to rule a country. He became paranoid about his own safety and the possible overthrow of his government, and he was too easily swayed by others. In short, Gqozo was inept, rather than evil.

Thesis (MA (African Languages))--University of Stellenbosch, 2005. / This study aims at highlighting one of the crucial aspects of Xhosa drama: how women have been regarded by a variety of communities as being inferior to men. This stereotype pervades almost all spheres of life. The low status assigned to women find its way into literature as well. Ngewu’s drama “Yeha mfazi obulala indoda” and Taleni’s drama “Nyana nank’uNyoko” has been examined. In most Xhosa literature, women are portrayed as submissive, obedient and minor characters. The advent of Ngewu’s work changed this scenario by portraying women as independent characters. This has led to great conflict with male characteristics and this demonstrates clearly that partriarchal domination is deep rooted in Xhosa culture.

Thesis (PhD)--University of Stellenbosch, 2001. / ENGLISH ABSTRACT: This study aims at highlighting a crucial aspect of Xhosa drama: The portrayal of the role women have been forced culturally to assume in society. A selection of Xhosa plays from three periods (1958 - 1965; 1974 - 1982; and 1988 - 1997) is examined. In the process of the study, the analysis and the interpretation of these dramas as well as the depiction of women characters is examined. Authors of the ten dramas under study advocate change through the powerful forces of gender stereotypes and culture distortions. The attributes that the authors commonly ascribe to women characters are passivity, irrationality, compliancy and incorrigibility. An examination of the reasons behind this proliferation of these female stereotypes and the lack of realistic women characters is undertaken. The study posits reasons why particular stereotypes appear in the works of several authors over a period of time. The women characters are products of social conditioning, that is, ideals or counter-ideals of the prevailing values of the authors' culture. They are a symbolic fulfillment of the writers' needs. The broad cultural perspectives of the authors also shape the texts they produce. These dramas treat issues and themes, which become central to the formal and structural ordering of the drama. Such themes have an impact at times on form and structure. In each case the ideology of the class represented by authors under study is indeed reflected in the text, to its detriment. The dominating themes in the ten dramas are forced marriages and women abuse. The authors are so preoccupied with injustices against women that they distort certain cultural aspects by, for example, exaggeration. Women are constantly depicted as victims, while there are no indications in the authors' depictions of women that perceptions of their cultural role and status are in reality undergoing changes. The thesis is arranged as follows: Chapter 1 introduces the aim, the scope, the theories and the methods of the study. Chapter 2 deals with the development of plot within episodes in the dramas of the first literary period (1958 - 1965). These episodes depict the different phases of the dramas. A critical evaluation of the dramas by motivating their positive and negative aspects is undertaken. Chapter 3 deals with the development of plot within episodes in the dramas of the second literary period (1974 - 1982). As in the first literary period, a critical evaluation of the dramas by motivating their positive and negative aspects is examined. Chapter 4 deals with the development of plot within episodes in the dramas of the third literary period (1988 - 1997). A critical evaluation of the dramas by motivating their good and bad points is undertaken. Chapter 5 deals with woman as character in Xhosa dramas under study. A detailed analysis of the main woman character in each drama is undertaken. Furthermore, a critical summary of how the woman has been portrayed in the dramas is presented. Chapter 6 presents depiction of Xhosa culture in the Xhosa dramas. From each drama, certain selected aspects of culture are explored and an investigation of the portrayal of these aspects is undertaken. Chapter 7 summarizes the findings of the study. / AFRIKAANSE OPSOMMING: Die doelstelling van hierdie studie is om 'n kern aspek van Xhosa drama te belig: die rolle wat vroue kultureel gedwing is om te vervul in die gemeenskap. 'n Seleksie Xhosa dramas vanuit drie tydperke (1958 - 1965; 1974 - 1982; en 1988 - 1997) word ondersoek. In die loop van die studie, ontleding en interpretasie van hierdie dramas word die uitbeelding van vroue karakters ook ondersoek. Die skrywers van die tien dramas wat bestudeer word, betoog vir verandering deur middel van die sterk kragte van stereopites en kultureelverwronge voorstellings. Die eienskappe wat die skrywers algemeen toeskryf aan vroue karakters is passiwiteit, irrasionele optrede, gehoorsaamheid en deugsaamheid. 'n Ondersoek na die redes vir die proliferasie van hierdie vroulike stereotipes en die tekortkoming aan realistiese vroue karakters in Xhosa dramas word uitgevoer in die studie. Die studie voer redes aan waarom bepaalde stereotipes in die werk van verskeie skrywers oor 'n tydperk verskyn: hulle vrouekarakters is die produk van sosiale kondisionering, dit wil sêm ideale of teen-ideale van die heersende waardes van die skrywer se kulturele agtergrond en 'n simboliese vervulling van die skrywer se behoeftes. Die algemene kulturele perspektiewe van die skrywers beïnvloed en vorm ook die tekste wat hulle lewer. Hierdie dramas behandel naamlik vraagstukke tematies wat sentraalook bepalend is ten opsigte van die vorm en struktuur van die drama. Sodanige temas het gevolglik in bepaalde gevalle 'n invloed op die vorm en struktuur van die drama. Voorts word die ideologie van die klas verteenwoordig deur die skrywers in elke geval gereflekteer en die teks tot bepaalde nadele daarvan. Die prominente temas in die tien dramas is gedwonge huwelike en vrouemishandeling. Die skrywers is so gepre-okkupeer met die ongeregtighede teenoor vroue dat hulle bepaalde kulturele aspekte verwring deur, byvoorbeeld, buitensporige voorstellings. Vroue word voortdurend voorgestel as slagoffers, terwyl daar feitlik geen aanduidings is in die skrywer se voorstelling van vroue, dat persepsies oor hulle kulturele rol en status inderwaarheid besig is om veranderinge te ondergaan. Die proefskrif is soos volg gestruktureer: Hoofstuk 1 gee die doelstellings, omvang, teorieë en metodes wat in die studie gevolg word. Hoofstuk 2 behandel die ontwikkeling van intrige binne verskillende episodes in die dramas van die eerste literêre periode (1958 - 1965). Hierdie episodes gee 'n uitbeelding van die verskillende fases van die dramas wat in die studie ondersoek word. 'n Kritiese evaluering word van die dramas gedoen deur die positiewe en negatiewe aspekte daarvan te motiveer. Hoofstuk 3 behandel die ontwikkeling van intrige binne die episodes van die dramas van die tweede literêre periode (1974 - 1982). Soos vir die eerste literêre periode, word 'n kritiese evaluering gedoen van die dramas deur onder andere die positiewe en negatiewe literêre aspekte daarvan te motiveer. Hoofstuk 4 ondersoek die ontwikkeling van die intrige binne die episodes in die dramas van die derde literêre periode (1988 - 1997). Die kritiese evaluering van hierdie dramas sluit, soos vir die vorige periodes, 'n gemotiveerde beskouing in van die positiewe en negatiewe aspekte. Hoofstuk 5 ondersoek die vrou as karakter in die Xhosa dramas wat bestudeer word. 'n Gedetaileerde analise van die hoof-vroue karakters in elke drama word gedoen. Daarna word 'n kritiese oorsig aangebied van hoe die vrou voorgestel word in die dramas wat bestudeer is. Hoofstuk 6 bied 'n uitbeelding van Xhosa kultuur in die dramas wat ondersoek is. Bepaalde aspekte van kultuur word vir elke drama ondersoek en die uitbeelding van hierdie kultuur aspekte word behandel. Hoofstuk 7 bied 'n opsomming van die belangrikste bevindinge van die studie.