363 resultados para Coluna de Winogradsky
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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
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Pós-graduação em Ginecologia, Obstetrícia e Mastologia - FMB
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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
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Coumarin is a natural active compound that can be found in many plants. The coumarins have many properties such as bronchodilator, anti-inflammatory, antioxidant, anticoagulant, antibiotics, immunomodulatory, antimicrobial and antiviral, thus, they are widely used in medical applications. More recently the coumarin derivatives have attracted the interest of many research groups in the field of new materials, for example the possibility of their use as sensitizers in dye-sensitized solar cells (DSSC) and lasers. The MCRs are defined as a process in which three or more reactants are combined in the same reaction pot, resulting in products with good structural complexity a single step, in addition to economy of atoms and selectivity and is a very important feature in modern synthetic methodology. In this work we investigated the use of niobium pentachloride as catalyst of the multicomponent reactions between phenolic derivatives, various aromatic aldehydes and β-diester derivatives in the synthesis of 4-aryl-3,4-dihydrocoumarin derivatives. The reactions were carried out at room temperature, under inert atmosphere (N2), using dichloromethane anhydrous (CH2 Cl2) as solvent, with a reaction time of most 120 hours. The products were isolated by column chromatography on silica gel and submitted to spectrometric and spectroscopic analysis. The results show that NbCl5 is an excellent agent for promoting the synthesis of 4-aryl-3,4-dihydrocoumarin derivatives through multicomponent reactions, obtaining yields varying from 45 to 95%
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Pós-graduação em Ciência dos Materiais - FEIS
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Pós-graduação em Química - IQ
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Magazines such as O Cruzeiro are part of the Brazilian collection. In its pages, the female presence is constant. From the concepts of Greimas’ way of life and happening and routine from Zilberberg, we analyse a photoreport which highlights the actress Ilka Soares, comparing her to texts of the session “To the woman”. The analysis of such texts lets us verify the behaviour of a distinguished professional which is different from the traditional model of the housewife of the fifties. Reconstitute the ways of life of these women is to make up for the memory of the country
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From the concepts of way of life by Greimas (1993) and of happening by Zilberberg (2008), we analyze texts taken from O Cruzeiro magazine, which highlights the singer Linda Batista, comparing her to others from the column “Female matters”, by Maria Teresa, love consultant of the women who read the publication. The analysis of such texts lets us verify the behaviour of a woman in distinction that identifies herself with a female profile of a professional who is configured in a style that can be recognized as a modern way of life, different from the model of a traditional way of a housewife in the forties.
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Pós-graduação em Química - IQ
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Pós-graduação em Design - FAAC
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Pós-graduação em Engenharia Civil - FEIS
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Pós-graduação em Cirurgia Veterinária - FCAV
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
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Pós-graduação em Ciências Farmacêuticas - FCFAR