La lithiase urinaire est une affection très répandue qui touche 4 à 18% de la population selon les pays. Cette pathologie nécessite beaucoup de recherches pluridisciplinaires. Le travail présenté dans cette thèse a pour objet de préciser la nature des calculs urinaires de l’Est Algérien et d’étudier ensuite le rôle de certains éléments traces ainsi que l’effet de quelques extraits de plantes médicinales sur la dissolution des calculs urinaires. Les techniques utilisées sont principalement les suivantes : la spectrophotométrie infrarouge à transformée de Fourier pour déterminer la composition chimique des calculs, la fluorescence X afin de déterminer la nature et la teneur des éléments traces et la microscopie électronique à balayage pour explorer la structure intime des cristallites à l’échelle mésoscopique. D’autres méthodes comme la microscopie optique ont été utilisées pour faire l’analyse morphoconstitutionnelle des calculs. Enfin, un modèle expérimental in vitro a été développé pour étudier l’effet des plantes médicinales. Bien que le nombre de calculs urinaires considérés soit faible, l’épidémiologie de la lithiase dans cette région de l’Algérie a été esquissée. Les calculs d’oxalate de calcium deviennent prépondérants en raison d’un changement des habitudes alimentaires avec toutefois une persistance des calculs d’origine infectieuse que l’infection soit urinaire ou digestive. Les données recueillies sur la distribution des éléments traces ne soulignent pas leur rôle catalytique mais sont en faveur d’un simple processus d’adsorption. Aucun des extraits de plantes testés, tous issus de la pharmacopée algérienne, n’a eu d’effet tangible pour dissoudre les calculs urinaires. / Urolithiasis is a widespread disease that affects 4-18% of the population according to the countries. This pathology requires a lot of multidisciplinary research. The work presented here aims firstly to clarify the nature of urinary stones in the eastern Algeria and then investigate the role of trace elements as well as the effect of some medicinal plants on the dissolution of urinary stones. The techniques used are mainly the following: Fourier transform infrared spectroscopy to determine the chemical composition of the calculi, X-ray fluorescence to determine the nature and content of trace elements and scanning electron microscopy to explore the inner structure of the crystallites at the mesoscopic scale. Other methods such as stereomicroscopy have been used for the morpho-constitutional analysis of the calculi and an experimental model was developed for the study of the effect of medicinal plants in vitro.Although the number of urinary stones considered being low, the epidemiology of urolithiasis in this region of Algeria was sketched. Calcium oxalate stones become predominant due to a change in eating habits but with a persistence of infection-induced calculi persist, whatever the urinary tract or gut origin of the infection. The acquired data do not underline a catalytic role of trace elements detected within the stones but are in favor of a simple adsorption process. None of the tested extracts from the Algerian pharmacopoeia has had a significant effect to dissolve the urinary stones.

As attention of scholars shift from perils of presidentialism to perils of semipresidentialism in the recent decades, French style of cohabitation power sharing mode in the executive merits our endeavor to understand the micro-dynamics that is embedded in it. It includes how it emerged, how it was practiced and what consequences it produced. Such effort, if wisely applied, can probably be helpful in slowing down the rate of political system breakdown in many of the newly emerged democratic systems that emulate the French model. After an introduction to the blackbox of French cohabitation, the remainder of the dissertation is divided into eight chapters. Chapter 2 briefly reviews the existing literature on French cohabitation. Chapter 3 introduces the interpretive paradigm of qualitative research that is employed to analyze data and to facilitate theory building. In the 4th theoretical discussion chapter, three elements of practice theory approach ¡V temporality, duality of structure and unanticipated consequences are elaborated respectively. The three elements correspond to answer three research questions comprising how cohabitation emerged, how it was practiced and what kinds of consequences it produced. Chapter 5 to 8 display findings to the questions. They unravel for us other faces of French cohabitation which can be an active outcome of rationalization, a dynamic generator and a collective inevitable self-deception. Chapter 9 concludes by delineating theoretical and practical contribution of the dissertation.

Made available in DSpace on 2014-12-17T14:27:11Z (GMT). No. of bitstreams: 1 MarianaS_capa_a_resumo.pdf: 271175 bytes, checksum: 926338aea632e3cbde76e722465b1d6e (MD5) Previous issue date: 2009-09-10 / Instituto Brasileiro de Petr?leo, G?s e Biocombust?veis / The oil activities in Brazil had been started in an intensive way in the end of the 30 s and in the beginning of the 40 s. Many of the brazilians fields discovered in the past are nowadays in decline. They are called ―mature fields‖. These fields, because of the decline situation that characterizes them, are not interesting for the majors. The majors want the big fields and big productions. On the other hand, they could be interesting for the small and medium enterprises. The mature oil fields are instruments of development, they have oil and the oil production is an activity connected with many social and economics benefits: jobs, taxes, royalties, etc. The Brazilian State, in this context, needs to realize actions to promote the activities in the mature oil fields, especially with the work of the small and mediums enterprises. Many of the onshore brazilian mature fields are located at the Northeast, a region matched by many social and economic problems. The activities in the mature fields of the Northeast Region could solve some of its problems. The present research analyses the mature oil fields and its situations in Brazil, making criticisms and suggestions. The methodology adopted is theoretical and descriptive, with literature review, case law and legislation (Constitui??o Federal de 1988, ―Law of the Oil‖). This research examines the following points: mature fields rounds and its documents, name and definition of the mature fields, definition of small and medium enterprises, environmental aspects, concentration of certain activities of the sector and the royalties / As atividades do petr?leo no pa?s foram iniciadas de forma mais intensa no final dos anos 30 e in?cio dos anos quarenta. Muitos dos campos de petr?leo descobertos no passado hoje se encontram em decl?nio produtivo, s?o os chamados ―campos maduros de petr?leo‖. Estes campos, em decorr?ncia do decl?nio em sua produ??o, n?o se revelam interessantes ?s grandes empresas de petr?leo. Grandes empresas desejam grandes campos e grandes produ??es. Por outro lado, podem os campos maduros se revelar interessantes aos empreendedores de menor porte. Os campos maduros, ainda que em decl?nio, possuem petr?leo e o petr?leo ? recurso energ?tico demasiadamente relevante. A produ??o de petr?leo, mesmo em campos declinantes, ? atividade ligada a in?meros benef?cios sociais e econ?micos: gera empregos direitos e indiretos, promove o recolhimento de tributos, o pagamento de royalties, dentre outros. O Estado brasileiro, neste contexto, necessita realizar a??es que promovam a continua??o da produ??o em campos maduros, especialmente atrav?s do ingresso de empreendedores de menor porte. Muitos dos campos maduros onshore se encontram no Nordeste brasileiro, regi?o marcada por s?rios problemas econ?micos e sociais e por uma intensa desigualdade. As atividades de produ??o de petr?leo nos campos maduros nordestinos podem resolver alguns destes problemas, fato este que ressalta a import?ncia do fomento ? continua??o destas atividades nestes campos. A presente pesquisa, atentando para a relev?ncia do fomento ? continua??o das atividades desenvolvidas nos campos maduros de petr?leo, se debru?a sobre seu estudo e atual realidade, formulando cr?ticas e sugest?es, em especial no que diz respeito ? entrada de empreendedores de menor porte no setor. Para isto, utiliza a metodologia do tipo te?rico-descritiva, com an?lise bibliogr?fica, jurisprudencial e normativa. Neste ?ltimo caso, a Constitui??o Federal de 1988 e a ―Lei do Petr?leo‖ se destacam. S?o aqui especificamente analisadas as licita??es at? hoje efetuadas em torno de ?reas contendo campos maduros de petr?leo, seus editais e contratos de concess?o. A pesquisa em quest?o ainda se ocupa das seguintes tem?ticas: conceito e denomina??o dos campos de petr?leo com produ??o declinante, necessidade de formula??o de um conceito para a express?o ―empreendedores petrol?feros de menor porte‖, licenciamento ambiental no setor do petr?leo, passivos ambientais atinentes aos campos maduros, concentra??o de determinadas atividades do setor junto ? Petrobras e royalties e necessidade de sua cobran?a em percentual reduzido

Text in Afrikaans, abstract in English / Writer investigates the constitutionality of section 18(4)(d) of the Child Care Act 74 of 1983 against the backdrop of the South African common law and the common law of comparative legal systems. In the South Africa law the mother of an illegitimate child has guardianship. The natural father does not have parental power which weakens his legal position. In analysing the judgement of the Constitutional Court, writer criticises the court for stating that in the case of a newborn baby the kind of discrimination which section 18( 4 )( d) authorises against a natural father may be justifiable in the initial period after the child is born. The constitutional position of the natural father in American jurisprudence is discussed at length. Writer concludes that the natural father has to take positive steps to vest a right to be heard in an adoption application. Proposals for legal reform are also made. / Private Law / LL. M. (Law)

Text in Afrikaans, abstract in English / Writer investigates the constitutionality of section 18(4)(d) of the Child Care Act 74 of 1983 against the backdrop of the South African common law and the common law of comparative legal systems. In the South Africa law the mother of an illegitimate child has guardianship. The natural father does not have parental power which weakens his legal position. In analysing the judgement of the Constitutional Court, writer criticises the court for stating that in the case of a newborn baby the kind of discrimination which section 18( 4 )( d) authorises against a natural father may be justifiable in the initial period after the child is born. The constitutional position of the natural father in American jurisprudence is discussed at length. Writer concludes that the natural father has to take positive steps to vest a right to be heard in an adoption application. Proposals for legal reform are also made. / Private Law / LL. M. (Law)