9 resultados para Relojes de sol-Tratados, manuales, etc.
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Dissertação apresentada na Faculdade de Ciências e Tecnologia da Universidade Nova de Lisboa para obtenção do grau de Mestre em Instrumentação, Manutenção Industrial e Qualidade
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Thèse pour obtenir le grade de DOCTEUR DE L' UNIVERSITÉ PARIS XII, Discipline: Urbanisme Aménagement
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Dissertação apresentada à Faculdade de Ciências e Tecnologia da Universidade Nova de Lisboa para cumprimento dos requisitos necessários à obtenção do grau de Mestre em Biotecnologia
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Dissertação para obtenção do Grau de Doutor em Engenharia Química e Bioquímica
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Dissertação apresentada para cumprimento dos requisitos necessários obtenção do grau de Mestre em História Moderna
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ROSA, Maria de Lurdes (org.),
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Em 1821, Garrett (1799-185 4) confessa estar "imitar" (...) uma composição alemã do século passado, não se recordando porém do respectivo autor (Garrett. 1963 I: 1708). Em 1853, "O Menino e a Cobra" surge em quinto lugar no seio da pequena colectânea de nove poemas intitulada Fábulas e Contos inserta na 2ª- edição de Folhas Caídas (Monteiro, 1999, 141), O autor alemão chama-se Gotthold Ephraim lessing 0729-1781), criador da fábula imitada e intitulada Der Knabe und die Schlange - a terceira em trinta constantes do II livro, centro de obra triptica publicada em 1759 pelo editor C.F.VoB em Berlim e intitulada Fabeln. Drei Bücher. Nebs( AblumdluTlgen mit dieser Dichtungsart werwandren Inhalts. [Fábulas. Três Livros. Acrescidos de Tratados de Conteúdo Aparentado com esta Espécie Literária Igualmente em 1853, a Imprensa de Francisco Xavier de Souza em Lisboa publica Fábulas de G. E. Lessing, traduzidas do alemão pelo _Médico Cirurgído pela Escola de Lisboa Professor de Geographia, Chronologia e História no Lyceo Nacional da Mesma Cidade, etc. (Pereira, 1853: Frontispicio} de nome Joâo Félix Pereira (1822-1891). Lessing, escolhido, porque "De todos os escritores de seo tempo nenhum fez tantos serviços á litterarura alleman." {Pereira, 1853: I I}, para quem - assim na "biograplia" introduzindo as traduções - "Shakespeare C..) tinha cm sua [De lessing] opinião o mérito dramático dos gregos." (1853 :1415) e cujo estudo e discussão deste mérito fizeram "A Dratuarurgia, Euulia Gallon, o Laocoon e Narhan pertencelrjem certamente ao número dos modelos que mais contribuíram para dar á língua alleman a precisão, de que se julgava insuceptivel." (l853: 15), tornando Lessing para a sua epocha, como Lutther para a sua o verdadeiro modelo clássico." (idém, ibudem) Nesta "Biographia de Lessing" (Pereira, 1853:11-16) atesta-se o valor de criador de noventa fábulas em prosa traduzidas na integra e publicadas em edição bilingue.
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In this work two different procedures to utilize the sol-gel technology were applied to immobilize/encapsulate enzymes and living cells. CO2 has reached levels in the atmosphere that make it a pollutant. New methods to utilize this gas to obtain products of added value can be very important, both from an environmentally point of view and from an economic standpoint. The first goal of this work was to study the first reaction of a sequential, three-step, enzymatic process that carries out the conversion of CO2 to methanol. Of the three oxidoreductases involved, our focus was on formate dehydrogenase (FateDH) that converts CO2 to formate. This reaction requires the presence of the cofactor β-nicotinamide adenine dinucleotide in reduced form (NADH). The cofactor is expensive and unstable. Our experiments were directed towards generating NADH from its oxidized form (NAD+), using glutamate dehydrogenase (GDH). The formation of NADH from NAD+ in aqueous medium was studied with both free and sol-gel entrapped GDH. This reaction was then followed by the conversion of CO2 to formate, catalysed by free or sol-gel entrapped FateDH. The quantification of NADH/NAD+ was made using UV/Vis spectroscopy. Our results showed that it was possible to couple the GDH-catalyzed generation of the cofactor NADH with the FateDH-catalyzed conversion of CO2, as confirmed by the detection of formate in the medium, using High Performance Liquid Chromatography (HPLC). The immobilization of living cells can be advantageous from the standpoint of ease of recovery, reutilization and physical separation from the medium. Also dead cells may not always exhibit enzymatic activities found with living cells. In this work cell encapsulation was performed using Escherichia coli bacteria. To reduce toxicity for living organisms, the sol-gel method was different than for enzymes, and involved the use of aqueous-based precursors. Initial encapsulation experiments and viability tests were carried out with E. coli K12. Our results showed that sol-gel entrapment of the cells was achieved, and that cell viability could be increased with additives, namely betaine that led to greater viability improvement and was selected for further studies. For an approach to “in-cell” Nuclear Magnetic Resonance (NMR) experiments, the expression of the protein ctCBM11 was performed in E. coli BL21. It was possible to obtain an NMR signal from the entrapped cells, a considerable proportion of which remained alive after the NMR experiments. However, it was not possible to obtain a distinctive NMR signal from the target protein to distinguish it from the other proteins in the cell.