Encontrados 5 documentos, a visualizar página 1 de 1
Ciência, Crise e Mudança. 3.º Encontro Nacional de História das Ciências e da T...
Brandão, José Manuel; Nunes, Maria de Fátima; Dias, Pedro Sousa; Abrantes, Isabel; Almeida, Maria Antónia; Antunes, Carlos; Assis, José LuísIII Encontro Nacional de História das Ciências e da Tecnologia. O Centro de Estudos de História e Filosofia da Ciência, organiza o 3.º Encontro Nacional de História da Ciência e da Técnica, sob o tema «Ciência, Crise e Mudança» que tem lugar na Universidade de Évora, nos dias 26, 27 e 28 de Setembro de 2012. O Primeiro Encontro Nacional de História da Ciência teve lugar em 21 e 22 Julho de 2009, no seguimento ...
A Study in Mauve: Unveiling Perkin's Dye in Historic Samples
Sousa, Micaela M.; Melo, Maria J.; Parola, A. Jorge; Morris, Peter J. T.; Rzepa, Henry S.; Melo, J. Sérgio Seixas deThe analysis of different historic mauve samples - mauve salts and dyed textiles - was undertaken to establish the exact nature of the iconic dye produced by W. H. Perkin in the nineteenth century. Fourteen samples from important museum collections were analyzed, and it was determined that, in contrast to the general wisdom that mauveine consists of C26 and C27 structures, Perkin's mauveine is a complex mixture...
A Study in Mauve: Unveiling Perkin's Dye in Historic Samples
Sousa, Micaela M.; Melo, Maria J.; Parola, A. Jorge; Morris, Peter J. T.; Rzepa, Henry S.; Melo, J. Sérgio Seixas deThe analysis of different historic mauve samples - mauve salts and dyed textiles - was undertaken to establish the exact nature of the iconic dye produced by W. H. Perkin in the nineteenth century. Fourteen samples from important museum collections were analyzed, and it was determined that, in contrast to the general wisdom that mauveine consists of C26 and C27 structures, Perkin's mauveine is a complex mixture...
Identification of 7,4prime-Dihydroxy-5-methoxyflavylium in ldquoDragon's Bloodr...
Melo, Maria J.; Sousa, Micaela; Parola, A. Jorge; Melo, J. Sérgio Seixas de; Catarino, Fernando; Marçalo, Joaquim; Pina, FernandoThe compound 7,4prime-dihydroxy-5-methoxyflavylium (dracoflavylium) was identified as the major red colorant in samples of the resin ldquodragon's bloodrdquo, extracted from the tree Dracaena draco. The complex network of reversible chemical reactions that dracoflavylium undergoes in aqueous solution is fully described; for the first time, all the equilibrium constants that enable a complete characterisation of...
Identification of 7,4prime-Dihydroxy-5-methoxyflavylium in ldquoDragon's Bloodr...
Melo, Maria J.; Sousa, Micaela; Parola, A. Jorge; Melo, J. Sérgio Seixas de; Catarino, Fernando; Marçalo, Joaquim; Pina, FernandoThe compound 7,4prime-dihydroxy-5-methoxyflavylium (dracoflavylium) was identified as the major red colorant in samples of the resin ldquodragon's bloodrdquo, extracted from the tree Dracaena draco. The complex network of reversible chemical reactions that dracoflavylium undergoes in aqueous solution is fully described; for the first time, all the equilibrium constants that enable a complete characterisation of...
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