935 resultados para 251001 Oceanografía biológica
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Tese de doutoramento em Antropologia, especialidade em Antropologia Biológica e Etnoecologia
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Dissertação para a obtenção do grau de doutor em Biologia pelo Instituto de Tecnologia Química e Biológica. Universidade Nova de Lisboa
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Dissertação para a obtenção do grau de doutor em Biologia pelo Instituto de Tecnologia Química e Biológica. Universidade Nova de Lisboa
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Dissertation presented to obtain the Ph.D degree in Engineering and Technology Sciences, Biotechnology
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Dissertation presented to obtain the Ph.D degree in Developmental Biology
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Dissertation presented to obtain the Ph.D degree in Biology, Cell Biology
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Dissertation presented to obtain the Ph.D degree in Biochemistry
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Dissertation presented to obtain the Ph.D degree in Biochemistry, Engineering and Technological Sciences
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Dissertation presented to obtain the Ph.D degree in Biochemistry
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Dissertation presented to obtain the Ph.D degree in Biology
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Dissertation presented to obtain the Ph.D degree in Biochemistry
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Dissertation presented to obtain the Ph.D degree in Biology
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Immunological tolerance, that is, the failure to mount an immune response to an otherwise immunogenic molecule, is one of the fundamental questions in immunology. The fact that lymphocytes express antigen receptors that are generated randomly and have the potential to recognize any conceivable antigen, adds another puzzle to the physiology of immunological tolerance. The other side of the coin, the general absence of immune responses to self antigens, is ensured by a tight regulation and several selection steps during T and B cell differentiation. One of these processes is the differentiation of regulatory T cells (Treg). While developing in the thymus, T cell clones bearing receptors with high affinity/avidity to antigens present at the time of differentiation may be eliminated by apoptosis or, alternatively, express Foxp3 and become Treg. Treg are key players in the regulation of immunological tolerance since humans and mice with complete loss of function variants of this gene develop fatal autoimmune conditions early in life.(...)
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Dissertation presented to obtain the Ph.D degree in Cellular Biology
The Role of Small RNAs and Ribonucleases in the Control of Gene Expression in Salmonella Typhimurium
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Dissertation presented to obtain the Ph.D degree in Biology