Technical ceramics are being widely employed in the electric power, medical and engineering industries because of their thermal and mechanical properties, as well as their high resistance qualities. The manufacture of technical ceramic components involves complex processes, including milling and stirring of raw materials in aqueous solutions, spray drying and dry pressing. In general, the spray-dried powders ex...
A extracção de elementos radioactivos, como o urânio, a partir das suas mineralizações leva à dispersão de contaminantes químicos e radiológicos para a água superficial/subterrânea e para o solo das áreas envolventes. Para avaliar a distribuição do urânio por diferentes fases orgânicas e inorgânicas, em solos da área mineira de Cunha Baixa submeteram-se várias amostras a extracção química parcial, em modo paral...
Neste trabalho avalia-se e comparara-se a concentração e capacidade de bioconcentração (CB) do urânio em diversas espécies vegetais (parte aérea) que se desenvolveram em solos de escombreira (Pinus pinaster, Cytisus striatus, Cytisus multiflorus) e cultivadas (Zea mays L., Phaseolus vulgaris L., Lactuca sativa L.) em solos da zona agrícola, envolvente à área mineira da Cunha Baixa (Mangualde). As espécies c...
Several recent reports in the literature show that some microemulsions and nanoemulsions have interesting antimicrobial properties. However, those studies lacked appropriate controls showing the action of the isolated components at similar concentrations. In this study we demonstrate that the bactericidal effects of two previously studied emulsions are due predominantly to one of their components. In fact, the ...
The knowledge of uranium concentration, in the products entering the human diet is of extreme importance because of their chemical hazard to health. Controlled field experiments with potatoes, beans and lettuce (Solanum tuberosum L., Phaseolus vulgaris L. and Lactuca sativa L.) were carried out in a contaminated soil used by local farmers located near a closed Portuguese uranium mine (Cunha Baixa, Mangualde). T...