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Impact of mercury contamination on the population dynamics of Peringia ulvae (G...
Cardoso, P G; Sousa, E; Matos, P; Henriques, B; Pereira, E; Duarte, A C; Pardal, M AThe effects of mercury contamination on the population structure and dynamics of the gastropod Peringia ulvae (also known as Hydrobia ulvae) and its impact on the trophic web were assessed along a mercury gradient in Ria de Aveiro (Portugal). The gastropod was revealed to be a tolerant species to the contaminant, since the highest densities, biomasses and growth productivity values were recorded at the intermed...
Mercury intracellular partitioning and chelation in a salt marsh plant, Halimio...
Válega, M; Lima, A I G; Figueira, E M A P; Pereira, E; Pardal, M A; Duarte, A CIn the presence of metal stress, plants can resort to a series of tolerance mechanisms. Therefore field studies should be undertaken in order to evaluate the real role of these mechanisms in stress coping. The aim of this paper was to clarify the biochemical processes behind mercury tolerance in Halimione portulacoides (L.) Aellen (Caryophyllales: Chenopodiaceae) collected in a mercury contaminated salt marsh. ...
Using capillary electrophoresis for the determination of organic acids in Port ...
Esteves, V. I.; Lima, S. S. F.; Lima, D. L. D.; Duarte, A CThe simultaneous separation and determination of organic acids in several samples of white and red Port wines was performed by capillary zone electrophoresis using indirectUVdetection with 2,6-pyridinedicarboxylic acid as a background electrolyte buffer. Operational parameters like migration time, temperature, voltage and capillary length were optimized. Sixteen samples of red wine and four samples of white win...
The use of endoprosthesis in superior vena cava syndrome caused by lung neoplasms.
Pisco, J M; Nobre, I; Fernandes, O; Garcia, V; Martins, J M; Duarte, A C; Freitas, M GWe present six cases of superior vena cava syndrome caused by a malignant tumor that were treated by percutaneous endoprostheses. The technique is described and the results evaluated. In one case there was acute thrombosis of the endoprosthesis that was treated by urokinase. No other complications were observed. A patient died one month later due to progression of the tumor. The remaining cases were asymptomati...
The utilisation of a piezoelectric quartz crystal for measuring carbon dioxide ...
Gomes, MT; Duarte, A C; Oliveira, JPA piezoelectric quartz crystal (PQC) is used for the quantification of carbon dioxide in still white wine. The methodology is discussed in terms of calibration stability and accuracy as a direct consequence of coating amount and absolute quantity of carbon dioxide in the samples. The method is compared, in terms of precision, with the titrimetric method. Standard deviations for several wine samples are, in the ...