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7 results on '"Mouro, F."'

2. Submarine Cascais Canyon as a sediment conduit to the deep sea : comparison with adjacent slopes

Author

Costa, A. M., Mil-Homens, Mário, Lebreiro, Susana, De Stigter, H., Richter, T., Boer, Wim, Trancoso, Maria Ascensão, Melo, Zenaida, Mouro, F., and Mateus, M

Subjects
Elementos maiores, Margem Continental Portuguesa, Metais pesados, Contaminação de águas, Canhão Submarino de Cascais (Portugal), Sedimentos marinhos
Abstract

Submarine canyons are known to be important conduits that trap, accumulate and deliver both natural and anthropogenic sediments from the shelf to the deep sea. Ten multi-cores from the Cascais Canyon and from the neighbour slopes (off Estremadura and Sines) were dated by 21Opb methodologies and analyzed for texture, major and trace metals to evaluate the role of submarine canyons in the transport of anthropogenic metals to the abyssal plains. Higher accumulation mass rates were determined in the upper Cascais Canyon than in the lower canyon and slopes. Enrichment factors (EF) were used to evaluate the level of metal enrichment in the studied areas. EF values exceeding natural background concentrations were obtained for Pb suggesting an anthropogenic and/or diagenetic source for Pb enrichment in the Cascais Canyon, but also, to a lesser extent, in the Estremadura and Sines slopes. Studies of provenance based on the ratio of different stable Pb isotopes can help to determinethe origin of such metal in the sediments.

Published
2009

3. Alterações recentes nas razões isotópicas de Pb em sedimentos do Canhão Submarino de Cascais, Portugal

Author

Mil-Homens, Mário, Caetano, M., Lebreiro, Susana, Costa, A. M., Richter, T., Cesário, R., Brito, Pedro Oliveira, De Stigter, H., Boer, Wim, Trancoso, Maria Ascensão, and Mouro, F.

Subjects
Margem Continental Portuguesa, Contaminação de águas, Canhão Submarino de Cascais (Portugal), Sedimentos marinhos, Chumbo
Abstract

Temporal variations in lead concentrations and stable lead isotopic ratios in two sediment cores from the Cascais Canyon shows changes in sources of Pb during the last two centuries. The increase of total Pb contents wIth the evolution of Pb ratio recorded in both cores reveals the Increase of Pb from industrial sources. Nevertheless, this increase is lower in deeper core location (252-32) due to dilution and mixing with uncontaminated marine materials. An isotopic shift towards lower Pb/Pb in the shallower core (252-35) during the 1970s may reflect the increasing number of vehicles in the Lisboa area during that time.

Published
2009

4. Incompatibilidade polen/pistilo em variedades de oliveira (Olea europaea L.)

Author

Cordeiro, A.M., Martins, P.C.S., Rosa, M.M., Mouro, F., Botelho, R., and Ramos, A.S.

Subjects
Olea europaea, Polinização
Abstract

A incompatibilidade intraespecífica em oliveira é geralmente aceite como a incapacidade do pólen germinar sobre o próprio estigma ou do crescimento do tubo polínico poder ser detido no seu percurso até ao ovário. Neste trabalho experimental pretendeu-se verificar a compatibilidade do pólen através do acompanhamento da germinação in vivo dos grãos de pólen colhidos de ramos frutíferos em autopolinização e em polinização livre das variedades `Cobrançosa', `Conserva de Elvas' e `Picual' cultivadas em sequeiro na região de Elvas nos anos de 2002 e 2003. A aderência de grãos de pólen foi menor em autopolinização, particularmente ao 2° dia alias a ântese e as diferenças foram maiores em 2002. Nesse ano foi também maior a diferença de tubos polínicos em crescimento presentes nos dois sistemas de polinização. Os mecanismos de incompatibilidade verificaram-se em todas as variedades, mas em menor expressão na `Picual'. Na `Conserva de Elvas' um reduzido número de grãos de pólen e de tubos polínicos em crescimento foram observados tanto em autopolinização como em polinização livre.

Published
2004

5. Tracing anthropogenic Hg and Pb input using stable Hg and Pb isotope ratios in sediments of the central Portuguese Margin

Author

Mil-Holmens, M., Blum, J., Canário, J., Caetano, M., Costa, A.M., Lebreiro, S.M., Trancoso, M., Richter, T.O., de Stigter, H., Johnson, M., Branco, V., Cesário, R., Mouro, F., Mateus, M., Boer, W., Melo, Z., Mil-Holmens, M., Blum, J., Canário, J., Caetano, M., Costa, A.M., Lebreiro, S.M., Trancoso, M., Richter, T.O., de Stigter, H., Johnson, M., Branco, V., Cesário, R., Mouro, F., Mateus, M., Boer, W., and Melo, Z.

Abstract

Three short marine sediment cores from the Cascais Submarine Canyon (CSC; cores 252-32 and 252-35) and the Estremadura Spur (core 252-16) on the central Portuguese Margin were analysed for Hg, Pb, Al, and Mn concentrations, and both Pb and Hg stable isotope compositions, in order to reconstruct trends in Hg and Pb sources and accumulation. Sediment ages were determined based on Pb-210 measurements. The studied cores reveal increasing Hg and Pb concentration, independent of grain-size variations, since the middle of the 19th century towards the Present. Concomitantly, a decreasing trend of Pb-206/Pb-207 to less radiogenic values towards the surface was found, indicating increasing anthropogenic inputs. The lowest values of delta Hg-202 were generally observed in the older sediments characterized by low Hg and Pb concentrations, suggesting a low input of anthropogenic metals. Odd mass number (Hg-199 and Hg-201) Hg isotopes in sediment samples from core 252-16 were characterized by positive mass independent fractionation (MIF), while recent sediments from cores 252-32 and 252-35 did not reveal significant MIF, probably reflecting both the proximity to the source of anthropogenic Hg contamination (Tagus Estuary) and the importance of the CSC as a particle carrier. The multi-tracer approach, based on both stable Hg and Pb isotopic signatures, confirms anthropogenic Hg and Pb enrichment in recent marine sediments and also allows us to distinguish between areas dominated by detrital (e.g. CSC) versus hemipelagic (Estremadura Spur) sedimentation.

Published
2013

7. Cognitive comorbidities of experimental absence seizures are independent of anxiety.

Author

Neuparth-Sottomayor M, Pina CC, Morais TP, Farinha-Ferreira M, Abreu DS, Solano F, Mouro F, Good M, Sebastião AM, Di Giovanni G, Crunelli V, and Vaz SH

Subjects
Humans, Child, Adolescent, Rats, Animals, Rats, Wistar, Cognition, Memory Disorders, Anxiety, Seizures
Abstract

Typical absence seizures (ASs) are brief periods of lack of consciousness, associated with 2.5-4 Hz spike-wave discharges (SWDs) in the EEG, which are highly prevalent in children and teenagers. The majority of probands in these young epileptic cohorts show neuropsychological comorbidities, including cognitive, memory and mood impairments, even after the seizures are pharmacologically controlled. Similar cognition and memory deficits have been reported in different, but not all, genetic animal models of ASs. However, since these impairments are subtle and highly task-specific their presence may be confounded by an anxiety-like phenotype and no study has tested anxiety and memory in the same animals. Moreover, the majority of studies used non-epileptic inbred animals as the only control strain and this may have contributed to a misinterpretation of these behavioural results. To overcome these issues, here we used a battery of behavioural tests to compare anxiety and memory in the same animals from the well-established inbred model of Genetic Absence Epilepsy Rats from Strasbourg (GAERS), their inbred strain of Non-Epileptic Control (NEC) strain (that lack ASs) and normal outbred Wistar rats. We found that GAERS do not exhibit increased anxiety-like behavior and neophobia compared to both NEC and Wistar rats. In contrast, GAERS show decreased spontaneous alternation, spatial working memory and cross-modal object recognition compared to both NEC and Wistar rats. Furthermore, GAERS preferentially used egocentric strategies to perform spatial memory tasks. In summary, these results provide solid evidence of memory deficits in GAERS rats that do not depend on an anxiety or neophobic phenotype. Moreover, the presence of differences between NEC and Wistar rats stresses the need of using both outbred and inbred control rats in behavioural studies involving genetic models of ASs., Competing Interests: Declaration of Competing Interest The authors declare no conflict of interest., (Copyright © 2023 The Authors. Published by Elsevier Inc. All rights reserved.)

Published
2023
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