Browsing by Author "Carvalho, A. P."
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- Antimicrobial activity and lipid profile of seaweed extracts from the North Portuguese coastPublication . Mendes, M.; Pereira, R.; Pinto, I. Sousa; Carvalho, A. P.; Gomes, A. M.Seaweeds or marine macroalgae are a potential renewable resource in the marine environment and can represent a source of new natural compounds for human nutrition. This experimental work focused on the selection of a suitable extraction method, using Gracilaria vermiculophylla as a model, followed by the characterization of the antimicrobial activity of different solvent extracts of Gracilaria vermiculophylla, Porphyra dioica and Chondrus crispus, both from wild and from an integrated multi-trophic aquaculture system (IMTA), collected in the north of Portugal. Additionally, the fatty acid profile of the seaweed extracts was also investigated. Extraction tests included the definition of the physical state of the seaweed, temperature and type of solvents to be used during the process. Results revealed that test organisms (Gram negative and Gram positive bacteria as well as one yeast species) were more sensitive to extracts obtained with dried algae, processed continuously at higher temperatures. Results from antimicrobial activity of wild and IMTA seaweed extracts showed stronger antimicrobial activity in extracts of ethyl acetate when compared with those from methanol and diethyl ether; furthermore, among the type of microorganisms tested, there was tendency for inhibition of the Gram positive ones. In general, there appears to be a higher antimicrobial activity for the microorganisms under study in extracts obtained from aquaculture species, when compared with the wild ones. The fatty acid profile of ethyl acetate extracts revealed a predominance of saturated fatty acids (SFA), especially palmitic acid (16:0), followed by polyunsaturated fatty acids (PUFA) and monounsaturated fatty acids (MUFA). A higher content of fatty acids in aquaculture extracts of Gracilaria vermiculophylla and Porphyra dioica was also observed.
- Artists connection between recycling and environmental educationPublication . Freitas, O.; Ramalhosa, M. J.; Soares, C.; Duarte, A.; Barroso, M. F.; Alves, R.; Carvalho, A. P.; Grosso, J.; Santos, L. H. M. L. M.; Moreira, M.; Delerure-Matos, C.The artistic production can play a role of reflection and alert to the recovery of waste and end-of-life materials, with the consequent circular economy implementation, minimizing the use of new natural resources. The competition “Reciclar é uma arte” was organized in the framework of a partnership between an academic institution - Instituto Politécnico do Porto (IPP)/Instituto Superior de Engenharia do Porto (ISEP) - and a research center - Laboratório Associado REQUIMTE-LAQV/GRAQ (Grupo de Reação e Análises Químicas). The main objectives were the dissemination of the concepts of recycling, green chemistry, sustainability and to show to the younger generations that Science can be accessible and fun. All products used by humanity originated from raw materials, which, during their possible transformation, use and consequent disposal will give rise to waste that will be discarded. This paper aims to demonstrate the connection between environmental education and ecological art, and how this association can help students to develop their creativity and critical thinking.
- Biochemical profiles in the microalga Pavlova lutheri: combined effects of light intensity and temperaturePublication . Carvalho, A. P.; Monteiro, C. M.; Malcata, F. X.
- Biochemical profiles in the microalga Pavlova lutheri: combined effects of light intensity and temperaturePublication . Carvalho, A. P.; Monteiro, C. M.; Malcata, F. X.
- Combined influence of incident light and temperature in the biochemical profiles of Pavlova lutheriPublication . Carvalho, A. P.; Monteiro, C.; Malcata, F. Xavier
- Combined influence of intensity of incident light and temperature in the biochemical profiles of Pavlova lutheriPublication . Carvalho, A. P.; Monteiro, C.; Malcata, F. X.
- Derivatization methods for gas-chromatographic analysis of marine lipids: insight studiesPublication . Carvalho, A. P.; Malcata, F. X.
- Growth and metabolic performance of Scenedesmus pleiomorphus in biphasic bioreactorsPublication . Carvalho, A. P.; Martins, V. H.; Malcata, F. X.
- Influence of the polarity of the derivatization medium on fatty acid assays in cod liver oilPublication . Carvalho, A. P.; Malcata, F. X.
- Investigação aplicada sobre biotecnologia de microalgasPublication . Meireles, L. A.; Carvalho, A. P.; Malcata, F. X.
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