Encontrados 19 documentos, a visualizar página 1 de 2
Marvão, os limites da candidatura a Património Mundial
Oliveira, Jorge; Lecoq, Nuno; Mirão, JoseNeste capítulo tenta-se determinar os limites físicos da candidatura de Marvão a património da humanidade
Pigment analysis of Portuguese portrait miniatures of 17th and 18th centuries ...
Ginja Teixeira, Jorge; Martins Teixeira, Dora; Mirão, José; Candeias, António J.; Simões Rodrigues, Paulo; Veiga, AlfredinaSeventeen Portuguese miniature portraits on copper support from the Évora Museum collection (Portugal) were analyzed in situ and nondestructively by Raman microscopy (RM), SEM-EDS, and stereomicroscopy. This work constitutes a great breakthrough in the study of miniature paintings from the 17th and 18th centuries, since the chemical information known about this unique kind of paintings are still scarce, and in ...
ENZYMATIC MONITORIZATION OF MURAL PAINTINGS BIODETERIORATION
Rosado, Tânia; Martins, M. Rosário; Pires, Margarida; Mirão, José; Candeias, A; Caldeira, A TeresaBiodeterioration of mural paintings by microorganisms is an important research field that needs novel approaches to fully understand the mechanisms and effects. In this work, the presence of microorganisms and their biological activity were investigated by extra and intracellular enzymatic monitorization. The enzymes arylsulphatase, β-glucosidase, dehydrogenase and phosphatase were used as biomarkers of the mic...
Notas sobre a geologia da zona de Arraiolos
Moita, Patrícia; Mirão, JoséCom todas as capacidades tecnológicas que as sociedades modernas nos deslumbram, temos tendência a esquecer como o meio que nos rodeia condiciona ou devia condicionar algumas das nossas decisões. O planeamento urbano e rural, a partir das duas últimas décadas do século XX, e algumas catástrofes naturais vieram lembrar-nos como dependemos do meio físico para a nossa segurança, para a obtenção de recursos essenci...
Enzymatic systems as biomarkers of cultural heritage decay: A new approach to a...
Pires, Margarida; Rosado, Tânia; Mirão, José; Candeias, António; Martins, M. Rosário; Caldeira, A. TeresaCultural Heritage decay is a serious problem with social and economic impact. Mural painting is one of the artistic expressions widely represented in Portugal, which over the time has suffered numerous forms of deterioration. Heritage decay depends on the physical properties and chemical nature of the materials, several environmental parameters and biological agents. The most harmful organisms involved in biode...
Enzymatic monitorization of mural paintings biodeterioration
Rosado, Tânia; Pires, Margarida; Mirão, José; Candeias, António; Martins, M. Rosário; Caldeira, A. TeresaMural paintings is not only a form of art but also a way of learn more about our ancestral traditions - that´s why it´s so important to protected it from biodegradation. There are several factors that affect this artworks, such as environmental conditions, chemical nature of the substrate and biological agents.
Magnetic fingerprints of stalagmites
Font, Eric; Veiga-Pires, C.; Camps, Pierre; Carvallo, Claire; Neto, António; Pozo, Manuel; Mirão, JoséDating stalagmite usi ng paleomagnetic methods is still in its early stage of development. Questions still remain regarding the nature and origin of the magnetic carriers and the reliability of the natural remanent magnetization preserved within the thin carbonat ed laminations of stalagmites. Here we apply high - resolution rock - and paleo - magnetic methods on two (altered and preserved) stalagmites in order...
Atmospheric halogen and acid rains during the major Deccan episode: magnetic an...
Font, Eric; Fabre, Sébastien; Nédélec, Anna; Adatte, Thierry; Keller, Gerta; Veiga-Pires, C.; Ponte, J.; Mirão, José; Khozyem, HassanEnvironmental and climatic changes linked to Deccan volcanism are still poorly known. A major limitation resides in the paucity of direct Deccan volcanism markers and in the geologically short interval where both impact and volcanism occurred, making it hard to evaluate their contributions to the mass extinction. We investigated the low magnetic susceptibility interval just below the Iridium-rich layer of the B...
Pathway Weathering in Granitoid Rocks from Central Region of Angola: Geochemica...
Duarte, Isabel M. R.; Mirão, José A. P.; Rocha, Fernando J. T.; Bonito, Fernando A. B.; Queta, Felisberto M.; Falcão, WinnieThe Central Region of Angola is characterized by the abundance of granitoid rocks, whose weathering “in situ” originated the so-called residual soils. The textural, geochemical and mineralogical properties of these soils depend not only on the chemical composition of parent rock, but mainly on the local climatic and geomorphological characteristics. In the study area, sampling sites were selected, which extend ...
Alteração de Rochas Granitóides em Angola.
Duarte, Isabel Maria Ratola; Mirão, José A. P.; Rocha, Fernando J. T.; Bonito, Fernando A. B.; Queta, Felisberto M.; Falcão, WinnieA Região Central de Angola caracteriza-se pela abundância de rochas granitóides, cuja alteração “in-situ” originou os denominados solos residuais. As propriedades texturais, geoquímicas e mineralógicas destes solos dependem não só da composição química da rocha mãe, mas principalmente das características geomorfológicas e climatéricas locais. Na região em estudo, seleccionaram-se locais de amostragem, que se es...
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