8 documents found, page 1 of 1
Polar marine biology science in Portugal and Spain: Recent advances and future ...
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.Polar 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 undertak...
Comparative study between probe focussed sonication and conventional stirring i...
Pereira, Sara; Fonseca, Luís P.; Capelo, José L.; Teresa, Armas; Fernanda, Vilhena; Pinto, Ana P.; Gonçalves, Maria L. S.; Mota, A. M.Abstract Ultrasound (US)-assisted extraction has been widely used for metal ion extraction in plants due to its unique properties of decreased extraction time, minimal contamination, low reagent consumption and low cost. However, very few papers present a sound comparison between probe-focussed sonication and conventional stirring in the evaluation of metal ion extraction in plants. In this study, ultrasonic-as...
Induction of cadmium-binding peptides in sorghum
Pinto, A.P.; Serafim, M. A,; Bebbianno, M. J.; Mota, A. M.Hydroponic experiments with sorghum were carried out in nutrient solution medium, under controlled environmental conditions for different periods of time. Cadmium (Cd ) was added at a final concentration of 0.1, 1 and 10 mg dm−3. The effect of time and cadmium concentration on the content of thiolic groups (TSH) in the “cell sap” of sorghum tissues are discussed in relation to plant resistance/tolerance to meta...
Cadmium Impact on Root Exudates of Sorghum and Maize Plants: A Speciation Study
Pinto, A.P.; Simões, I; Mota, A. M.The effect of cadmium (Cd) on root exudates of sorghum and maize was investigated in order to get further insight into the mechanisms of plant tolerance to Cd. Plants were grown hydroponically and supplemented with: 0, 0.5, and 5.0 mg Cd L−1. Hydroponic solutions containing exudates were analyzed by high performance liquid chromatography (HPLC). The results showed different exudation patterns by sorghum and mai...
Sorghum Detoxification Mechanisms
Pinto, A.P.; de Varennes, A.; Gonçalves, M. L. S.; Mota, A. M.The influence of cadmium (Cd) on internal and external defense mechanisms of Sorghum bicolor (L.) Moench. x Sorghum sudanense was studied by electrochemical methods to infer the type of detoxification processes developed by the plant under environmental stress conditions. Hydroponic experiments with sorghum were conducted in nutrient solutions in the absence and presence of 0.1 mg Cd L−1. Plant exposure to Cd s...
Organic matter effect on phytoremediation of cadmium contaminated soils
Pinto, A.P.; Gonçalves, MLS; Mota, A. M.Phytoremediation refers to clean-up of polluted sites, terrestrial as well as aquatic environments, from heavy metal and organic contaminants by plants. A good phytoremediador plant should ideally have high and fast biomass production, and ability to translocate the pollutants into the shoot. In the last few years, great efforts have been directed to the search of hyperaccumulator plants and the study of their ...
Organic matter influence in cadmium uptake by sorghum
Pinto, A.P.; Vilar, M. T.; Pinto, F. C.; Mota, A. M.The influence of soil organic matter (OM) in the uptake of cadmium (Cd) by Sorghum will be studied in order to get a better knowledge in the yield and understanding of detoxification mechanisms of soils. Plants were grown for 60 days in a greenhouse pot experiment using a contaminated soil with 4.5 and 35 mg Cd kg_1, in absence and presence of OM. An Irish peat moss (70 g kg_1 of soil) was added as OM. In the p...
Electrochemical methods for speciation of trace elements in marine waters. Dyna...
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, onl...