14 resultados para Falhas ósseas
em SAPIENTIA - Universidade do Algarve - Portugal
Resumo:
Dissertação de Mestrado, Engenharia Eletrónica e Telecomunicações, Faculdade de Ciências e Tecnologia, Universidade do Algarve, 2014
Resumo:
Dissertação de Mestrado, Biologia Marinha, Especialização em Biotecnologia Marinha, Faculdade de Ciências do Mar e do Ambiente, Universidade do Algarve, 2008
Resumo:
Dissertação de mestrado, Observação e Análise da Relação Educativa, Faculdade de Ciências Humanas e Sociais, Universidade do Algarve, 2005
Resumo:
Dissertação de mest., Biologia Marinha (Aquacultura), Faculdade de Ciências e Tecnologia, Univ. do Algarve, 2010
Resumo:
Tese de dout., Biologia (Fisiologia Vegetal), Faculdade de Engenharia dos Recursos Naturais, Univ. do Algarve, 2005
Resumo:
Tese de doutoramento, Ciências da Educação (Observação e Análise da Relação Educativa), Faculdade de Ciências Humanas e Sociais, Univ. do Algarve, 2011
Resumo:
O objetivo da presente dissertação visa analisar o perfil sócio-demográfico dos turistas de negócios no Algarve, perceber as motivações que os levam a conferências e congressos, analisar a sua satisfação com os atributos do evento e com os atributos do destino, bem como analisar a sua satisfação global com ambos. Para esse fim, foram aplicados os questionários aos turistas de negócios em Vilamoura, cujos resultados foram analisados através do software Statistical Packages for Social Sciences (SPSS) 17,0. Os resultados obtidos permitem fazer uma caracterização do perfil sócio-demográfico do turista de negócios em Vilamoura. Como principais motivações que os levam a congressos/conferências verificaram-se os seguintes: tema do congresso, valorização profissional, estabelecimento de contactos profissionais, oportunidade de convívio e atratividade do destino. Verificou-se também que as motivações podem ser influenciadas por alguns dos aspetos do perfil sócio-demográfico dos indivíduos, tais como: sexo, idade, nacionalidade, estado civil, habilitações literárias e rendimento. Quanto à satisfação, concluiu-se que os congressistas estão mais satisfeitos com os congressos/conferências do que com o destino. A sua satisfação não é influenciada pelo seu perfil sócio-demográfico, mas pelo conjunto de atributos relacionados com o desempenho do congresso/conferência e pelos atributos do destino. Foram feitas várias recomendações de modo a eliminar as falhas existentes, melhorar a gestão dos serviços e satisfazer as expectativas, necessidades e desejos dos turistas de negócios para que estes voltem e informem outros acerca do congresso e do destino Algarve.
Resumo:
In ecotoxicology a major focus is in the aquatic environment, not only because it presents a great economic value to man but it is an ecosystem widely affected by the growing anthropogenic pollution. Most of the studies performed relate to adverse effects in development, reproductive or endocrine disruption but little is known about the possible effects in bone formation and skeletal development. In this study, we set out to evaluate the effects of 8 aquatic pollutants on the skeletal development using an in vivo system, the zebrafish larvae aged 20 days post-fertilization, through chronic exposure. Several endpoints were considered such as the cumulative mortality, total length, occurrence of skeletal deformities and marker gene expression. We were able to establish LD50 values for some pollutants, like 3-methylcholanthrene, lindane, diclofenac, cobalt and vanadate and found that the total length was not affected by any of the pollutants tested. Cobalt was the most harmful chemical to affect hatching time, severely affecting the ability of the zebrafish embryos to hatch and overall the number of deformities increased upon exposure to tested chemicals but no patterns of deformities were identified. We also propose that 3-methylcholanthrene has an osteogenic effect, affecting osteoblast and osteoclast function and that op levels can act as a mediator of 3-methylcholanthrene toxic stress to the osteoblast. In turn we found naphthalene to probably have a chondrogenic effect. Our results provided new insights into the potential osteotoxicity of environmental pollutants. Future studies should aim at confirming these preliminary data and at determining mechanisms of osteotoxicity.
Resumo:
Bone morphogenetic proteins (BMPs) are multifunctional growth factors belonging to the transforming growth factor β (TGFβ) superfamily with a central role in bone formation and mineralization. BMP2, a founding member of this family, has demonstrated remarkable osteogenic properties and is clinically used to promote bone repair and fracture healing. Lack of basic data on factors regulating BMP2 expression and activity have hampered a better understanding of its role in bone formation and bone-related diseases. The objective of this work was to collect new functional data and determine spatiotemporal expression patterns in a fish system aiming towards a better understanding of BMP2 function and regulation. Transcriptional and post-transcriptional regulation of gilthead seabream BMP2 gene was inferred from luciferase reporter systems. Several bone- and cartilage-related transcription factors (e.g. RUNX3, MEF2c, SOX9 and ETS1) were found to regulate BMP2 transcription, while microRNA 20a was shown to affect stability of the BMP2 transcript and thus the mineralogenic capacity of fish bone-derived host cells. The regulation of BMP2 activity through an interaction with the matrix Gla protein (MGP) was investigated in vitro using BMP responsive elements (BRE) coupled to luciferase reporter gene. Although we demonstrated the functionality of the experimental system in a fish cell line and the activation of BMP signaling pathway by seabream BMP2, no conclusive evidence could be collected on a possible interaction beween MGP and BMP2. The evolutionary relationship among the members of BMP2/4/16 subfamily was inferred from taxonomic and phylogenetic analyses. BMP16 diverged prior to BMP2 and BMP4 and should be the result of an ancient genome duplication that occurred early in vertebrate evolution. Structural and functional data suggested that all three proteins are effectors of the BMP signaling pathway, but expression data revealed different spatiotemporal patterns in teleost fish suggesting distinct mechanisms of regulation. In this work, through the collection of novel data, we provide additional insight into the regulation, the structure and the phylogenetic relationship of BMP2 and its closely related family members.
Resumo:
Tese de doutoramento, Ciências Biomédicas, Universidade do Algarve, Departamento de Ciências Biomédicas e Medicina, 2014
Resumo:
Tese de doutoramento, Ciências Biomédicas, Departamento de Ciências Biomédicas e Medicina, Universidade do Algarve, 2014
Resumo:
Dissertação de mestrado, Engenharia do Ambiente, Faculdade de Ciências e Tecnologia, Universidade do Algarve, 2015
Resumo:
Dissertação de mestrado, Oncobiologia,(Mecanismos Moleculares do Cancro), Departamento de Ciências Biomédicas e Medicina, Universidade do Algarve, 2015
Resumo:
Dissertação de mestrado, Gestão da Qualidade e Marketing Agro-Alimentar, Faculdade de Ciências e Tecnologia, Universidade do Algarve, 2015