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Rótulos portugueses de 1930 a 1980

Este trabalho faz uma breve análise e apresentação organizada de rótulos portugueses de cerveja, refrigerantes e água entre as décadas de 1930 e 1980. Ao longo da história portuguesa foram vários os factos de ordem política ou social que de várias formas ficaram marcados na imagem dos rótulos, sendo este um dos factores de relevo para agora os querermos organizar numa colecção que os disponibilize a um público ...

Os processos cognitivos inerentes ao processo de ensino-aprendizagem no âmbito ...

Relatório Final de Estágio apresentado à Escola Superior de Dança, com vista à obtenção do grau de Mestre em Ensino da Dança. ; O presente relatório de Estágio, elaborado no âmbito do Mestrado em Ensino de Dança com aplicação prática no Ginasiano Escola de Dança, teve como foco de estudo os principais processos cognitivos inerentes ao processo ensino–aprendizagem, presente na disciplina de Técnica de Dança Clá...

Minimização dos efeitos do défice hídrico em Quercus suber L. com a aplicação d...

O sobreiro (Quercus suber L.) é uma espécie característica da Bacia do Mediterrâneo e reveste-se de grande importância sócio-económica e ecológica em Portugal. A diminuição da disponibilidade de água na região mediterrânica, em particular na estação mais seca, é uma das características mais relevantes incluídas na alteração climática à escala global. Como consequência, são de esperar alterações significativas n...

New syntheses of novel arylxanthones

Xanthones represent an outstanding class of oxyg~1_1ated heterocycles widespread in nature, commonly distributed in several higher plant families, such as Gentianaceae, Guttiferae and Polygalaceae and in a few families of fungi and lichens [1]. Both natural and synthetic derivatives often endowed with interesting pharmacological properties (e.g. anti-inflammatory, antitumour and antioxidant activities [1,2]. Na...

Synthesis of novel 2-Butadienylchromone derivatives

Chromones are a group of naturally occurring compounds with a benzoannelated ypyrone ring. A large number of chromone derivatives have been isolated from natural sources and a wide range of biological properties have been attribute to them, such as antifungal, anti-allergenic, antiviral, antitubulin, anti-hypertensive, anticancer and antioxidant activities.1 11 Studies with 2-styrylchromones demonstrated that t...

Structure determination of some oxygen and nitrogen heterocyclic compounds by NMR

Oxygen heterocyclic compounds are widely distributed in Nature, being chromone and xanthone derivatives some examples. For instance, the xanthone ring system is a structural motif prevalent in higher plants such as those of Guttiferae and Gentianaceae families.1 Both natural and synthetic derivatives often endowed with interesting pharmacological properties, such as anti-inflammatory,2 antitumour3 and antioxida...

Novel highly emissive non proteinogenic amino acids : synthesis of 1,3,4-thiadi...

Highly emissive heterocyclic asparagine derivatives bearing a 1,3,4-thiadiazolyl unit at the side chain, functionalised with electron donor or acceptor groups, were synthesised and evaluated as amino acid based fluorimetric chemosensors for metal cations such as Cu2+, Zn2+, Co2+ and Ni2+. The results suggest that there is a strong interaction through the donor heteroatoms at the side chain of the various aspara...

Synthesis of Novel 1-Aryl-9H-xanthen-9-ones

A novel route for the synthesis of 1-aryl-9H-xanthen-9-ones is reported. This methodology involves the condensation of 2-methylchromone with cinammaldehydes leading to (E,E)-2-(4-arylbuta-1,3-dien-1-yl)-4H-chromen-4-ones. The final step was the electrocyclization and oxidation reactions of the latter compounds, in an one-pot synthesis, giving the desired 1-aryl-9H-xanthen-9-ones.

Recent developments in the synthesis of 1-aryl-9H-xanthen-9-ones

Unnatural benz-X-azolyl asparagine derivatives as novel fluorescent amino acids...

A family of new asparagine derivatives bearing benzothiazole and benzimidazole units, functionalised with electron donor or acceptor groups, were synthesized in good to excellent yields. The photophysical characterization of these new heterocyclic amino acids was performed by UV-visible absorption and fluorescence emission studies and revealed that the compounds displayed remarkably high fluorescence quantum yi...