L’objectif général de cette thèse est d’étudier et d’analyser l’effet du rayonnement UV-C comme méthodealternative aux produits chimiques dans la lutte et le contrôle de la prolifération des micro-organismesphotosynthétiques dans les grottes touristiques. Dans un premier temps, l’effet des UV-C a été analysé surdifférentes souches cavernicoles de micro-algues cultivées au laboratoire. Des analyses à l’échelle moléculaire,cellulaire et à l’échelle du biofilm d’algues ont permis de mettre en évidence un ensemble de dommages causépar l’irradiation aux UV-C (diminution de la viabilité et de l’activité photosynthétique, dégradation desmembranes, décoloration des cellules par destruction des pigments chlorophylliens, fragmentation de l’ADN,diminution de la surface d’occupation des biofilms d’algues cultivés sur support solide). Ceux-ci sont soit directs(réactions de photooxydation) soit indirects (liés à un stress oxydatif important). L’ensemble de ces résultats ontservi à la sélection de différentes durées d’exposition aux UV-C (traduites en doses d’UV-C) efficaces en termesd’éradication et de décoloration des micro-algues. Ces doses d’UV-C ont dans un deuxième temps été testées enconditions réelles sur le site d’étude de la grotte des Moidons (Jura, France). Une étude préalable à ces tests a étémenée afin de comprendre les dynamiques et les facteurs favorisant l’installation et la prolifération des biofilmsde micro-organismes photosynthétiques dans la grotte. L’étude des facteurs environnementaux mesurés àl’échelle du biofilm (quantité de lumière, type de support, localisation dans la grotte) ainsi que ceux mesurés àl’échelle de la cavité (circulation horizontale et verticale des eaux, vitesse des courants d’air, temps d’allumagedes lampes et temps de présence des visiteurs) ont permis de distinguer des zones de colonisation préférentielle.Plusieurs biofilms ont ensuite été sélectionnés pour tester l’efficacité des UV-C. Selon les caractéristiques desbiofilms (intensité de colonisation) et en fonction de leur emplacement dans la grotte (variations des facteurspréalablement déterminés), nous avons pu mettre en évidence une efficacité des UV-C variable dans le temps.Avec l’appui de résultats complémentaires obtenus sur deux souches de champignons et sur plusieurs types dematières picturales, l’ensemble des données collectées au cours de la thèse souligne l’intérêt et l’applicabilité destraitements aux UV-C dans divers contextes de conservation des matériaux du patrimoine / The aim of this thesis is to study and analyze the effect of UV-C radiation as an alternative method tochemicals to combat phototrophic microorganisms’ proliferation in show caves. First, the effect of UV-C wasanalyzed on several cave-dwelling unicellular green algae sub-cultured in laboratory conditions. Analysis at themolecular, cellular and biofilm scale highlighted several damages (decrease of viability and photosyntheticactivity, membrane degradation, chlorophyll bleaching, DNA fragmentation, decrease of the biofilms’ colonizedarea…) both direct (photooxydation reaction) or indirect (oxidative stress). These results helped to selectefficient UV-C exposure times (traduced in UV-C doses) both to eradicate and bleach green micro-algae.Second, these efficient UV-C doses were used to test the efficiency of UV-C treatments on natural phototrophicbiofilms proliferating in the Moidons Cave (Jura, France). Previous study to the UV-C tests was performed tounderstand the dynamics and factors that promote algal proliferation in this cave. Factors measured at the biofilmscale (quantity of light, type of the physical support, localization in the cave…) and at the cavity scale(horizontal and vertical circulation of waters, air currents, illumination time and visitors’ presence time) allowedto distinguish several preferential areas where growth-supporting conditions were present for algal proliferation.Then, several biofilms were selected to test the efficiency of UV-C treatments. According to the characteristicsof the biofilms (colonization intensity) and their localization in the cave (variations of the factors promotingcolonization) UV-C efficiency varied over time. Supplementary results obtained on filamentous fungi andmineral pigments used for prehistoric paintings, emphasize the interest and the applicability

Traditionally, governments are the main providers of development assistance and re-sponsible for stimulating social development in the third world. In recent years, Corpo-rate Social Responsibility has gained considerable ground and it is now common for corporations to get involved in activities resembling those carried out in the name of development assistance. A deconstruction of these two activities shows that they could be described as two definitions of the same concept. Through a set of research ques-tions, this thesis explores the relationship between CSR and development assistance and seeks to identify possibilities for future cooperation between them. The purpose of the thesis is to investigate (1) if there is a future possibility for a com-mon strategy where CSR and Development Assistance collaborate; (2) if developing countries would benefit from corporate involvement in development assistance; and (3) who else could benefit from such a strategy. The main conclusion is that there are substantial possibilities for future co-operation be-tween them. It seems clear from the research that neither governmental development as-sistance organizations nor corporations stand a chance to eradicate poverty alone. It is, however, crucial that poverty eradication has to be the common goal for all actors in-volved. For cooperation to succeed the public must realize that a collaborative strategy is a way of including more actors in pursuing the goal of poverty eradication and not a way of trasferring money from development assistance to corporations. Further, distribution of responsibility becomes useless if legal or official guidelines are unable to decide who has the ultimate responsibility. It is importance that responsibility is also followed by accountability. Corporations would benefit by gaining access to emerging markets and the possibilities for innovative business strategies. Development assistance agencies would by introduc-ing new strategies improve the results and get more resources to achieve effective po-verty reduction. If corporations and development assistance agencies collaborate and focus on long-term projects real effectiveness will be the result. The general opinion seems to be that with a clearly set goal, several coordinated actors have a better chance of achieving it than one.

No description available.

PhDRDV / Institute for Rural Development / See the attached abstract below

Poverty is a condition where people's basic needs for food, clothing and shelter are not being met. Poverty is generally of two types: absolute and relative poverty. Some of the causes of poverty include changing trends in a country’s economy, lack of education, high divorce rate which causes feminisation of poverty, having a culture of poverty, overpopulation, epidemic diseases such as AIDS and malaria, and environmental problems such as lack of rainfall (business dictionary.com). / Dissertation (PhD (Applied Theology))--University of Pretoria, 2014. / Centre for Contextual Ministry / PhD (Applied Theology) / Unrestricted

Promoting household food security for many poor people globally and more so in Sub-Saharan Africa continues to be a challenge today. Ever rising poverty levels, an influx in the prevalence of the HIV/ AIDS pandemic, reduced rainfall accompanied by changing climatic patterns, environmental bankruptcy, the complexities associated with urbanization, globalisation as well as technology shift in the agricultural sector and capitalistic market economies all play a role in the food security debate. This research has highlighted some of the factors that influence the food economy and related these to the household food security of poor informal settlement dwellers. Achieving household food security for poor urban households requires an integrated approach in terms of poverty eradication as well as deliberate efforts with regards to food production and distribution within a framework of ecological integrity, with an aim of empowering the poor and ensuring that their household food security is guaranteed. / Development Studies / Thesis (M.A. (Development Studies))

No description available.

Promoting household food security for many poor people globally and more so in Sub-Saharan Africa continues to be a challenge today. Ever rising poverty levels, an influx in the prevalence of the HIV/ AIDS pandemic, reduced rainfall accompanied by changing climatic patterns, environmental bankruptcy, the complexities associated with urbanization, globalisation as well as technology shift in the agricultural sector and capitalistic market economies all play a role in the food security debate. This research has highlighted some of the factors that influence the food economy and related these to the household food security of poor informal settlement dwellers. Achieving household food security for poor urban households requires an integrated approach in terms of poverty eradication as well as deliberate efforts with regards to food production and distribution within a framework of ecological integrity, with an aim of empowering the poor and ensuring that their household food security is guaranteed. / Development Studies / Thesis (M.A. (Development Studies))

Urbanisation in South African cities is a worrying phenomenon. Cities such as the City of Johannesburg are faced with a severe housing backlog. This situation could be attributed to many issues such as lack of suitable land for housing, and the existence of informal settlements. This study has been undertaken to investigate whether the interventions implemented by City of Johannesburg Metropolitan Municipality to eradicate informal settlements are effective in addressing challenges faced by informal settlement dwellers. In South Africa, informal settlement upgrading process is acknowledged as an effective means of eradicating informal settlements. In this regard, interventions to eradicate informal settlements require extensive research in order to have proposals for future policy interventions. This study has been also undertaken to make some recommendations that might resolve the challenges of informal settlements in the City of Johannesburg. / Public Administration & Management / M.P.A.

Urbanisation in South African cities is a worrying phenomenon. Cities such as the City of Johannesburg are faced with a severe housing backlog. This situation could be attributed to many issues such as lack of suitable land for housing, and the existence of informal settlements. This study has been undertaken to investigate whether the interventions implemented by City of Johannesburg Metropolitan Municipality to eradicate informal settlements are effective in addressing challenges faced by informal settlement dwellers. In South Africa, informal settlement upgrading process is acknowledged as an effective means of eradicating informal settlements. In this regard, interventions to eradicate informal settlements require extensive research in order to have proposals for future policy interventions. This study has been also undertaken to make some recommendations that might resolve the challenges of informal settlements in the City of Johannesburg. / Public Administration and Management / M.A. (Public Administration)