Percorrer por autor "Mota, A. M."
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- Electrochemical methods for speciation of trace elements in marine waters. Dynamic aspectsPublication . Mota, A. M.; Pinheiro, J. P.; Simões Gonçalves, M. L.The contribution of electrochemical methods to the knowledge of dynamic speciation of toxic trace elements in marine waters is critically reviewed. Due to the importance of dynamic considerations in the interpretation of the electrochemical signal, the principles and recent developments of kinetic features in the interconversion of metal complex species will be presented. As dynamic electrochemical methods, only stripping techniques (anodic stripping voltammetry and stripping chronopotentiometry) will be used because they are the most important for the determination of trace elements. Competitive ligand ex- change-adsorptive cathodic stripping voltammetry, which should be considered an equilibrium technique rather than a dynamic method, will be also discussed because the complexing parameters may be affected by some kinetic limitations if equilibrium before analysis is not attained and/or the flux of the adsorbed complex is in fluenced by the lability of the natural complexes in the water sample. For a correct data interpretation and system characterization the comparison of results obtained from different techniques seems essential in the articulation of a serious discussion of their meaning.
- Polar marine biology science in Portugal and Spain: Recent advances and future perspectivesPublication . Xavier, J.; Barbosa, Ana B.; Agustí, S.; Alonso-Sáez, L.; Alvito, P.; Ameneiro, J.; Ávila, C.; Baeta, A.; Canário, J.; Carmona, R.; Catry, P.; Ceia, F.; Clark, M. S.; Cristobo, F. J.; Cruz, B.; Duarte, C. M.; Figuerola, B.; Gili, J.-M.; Gonçalves, A. R.; Gordillo, F. J. L.; Granadeiro, J. P.; Guerreiro, M.; Isla, Enrique; Jiménez, C.; López-González, P. J.; Lourenço, S.; Marques, J. C.; Moreira, E.; Mota, A. M.; Nogueira, M.; Núñez-Pons, L.; Orejas, C.; Paiva, V. H.; Palanques, A.; Pearson, G. A.; Pedrós-Alió, C.; Peña Cantero, T. L.; Power, Deborah; Ramos, J. A.; Rossi, S.; Serrão, EsterPolar marine ecosystems have global ecological and economic importance because of their unique biodiversity and their major role in climate processes and commercial fisheries, among others. Portugal and Spain have been highly active in a wide range of disciplines in marine biology of the Antarctic and the Arctic. The main aim of this paper is to provide a synopsis of some of the results and initiatives undertaken by Portuguese and Spanish polar teams within the field of marine sciences, particularly on benthic and pelagic biodiversity (species diversity and abundance, including microbial, molecular, physiological and chemical mechanisms in polar organisms), conservation and ecology of top predators (particularly penguins, albatrosses and seals), and pollutants and evolution of marine organisms associated with major issues such as climate change, ocean acidification and UV radiation effects. Both countries have focused their polar research more in the Antarctic than in the Arctic. Portugal and Spain should encourage research groups to continue increasing their collaborations with other countries and develop multi-disciplinary research projects, as well as to maintain highly activememberships within major organizations, such as the Scientific Committee for Antarctic Research (SCAR), the International Arctic Science Council (IASC) and the Association of Polar Early Career Scientists (APECS), and in international research projects.