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Long-term monitoring of a mercury contaminated estuary (Ria de Aveiro, Portugal...
Coelho, J. P.; Pato, P.; Henriques, B.; Picado, A.; Lillebo, A. I.; Dias, J. M.; Duarte, A. C.; Pereira, M. E.; Pardal, M. A.The main aim of this research was to assess the mercury transport from an estuarine basin with a background of anthropogenic contamination during a spring tidal cycle (year 2009) and compare it with two previous tidal cycles (years 1994 and 1999), as part of a long-term monitoring program. Results showed that effective mercury transport occurs both in the dissolved and particulate fractions (0.18 and 0.20 kg pe...
Estudo detalhado de isótopos de Nd e Sr em sedimentos do core KC 024-19 (talude...
Santos, J. F.; Martins, V.; Ribeiro, S.; Carvalho, A. T.; Matinhas, C.; Dias, J. M. A.; Rocha, F.Neste trabalho, actualizam-se os dados isotópicos de Nd e Sr que esta equipa tem vindo a obter nos últimos anos com base em amostras do core KC 024-19 (-2765 m, 42°08’98’’N, 10°29´96’’W). Este core foi colhido no talude continental da Galiza e, nele, está representada a sedimentação ocorrida nos últimos 40 ka. No nosso estudo, dá-se particular destaque aos quatro níveis de Heinrich (H1 a H4) que foram identific...
Abiotic modulation of Spartina maritima photobiology in different latitudinal p...
Duarte, B.; Couto, Thiago; Freitas, J.; Valentim, J.; Silva, H.; Marques, J. C.; Dias, J. M.; Caçador, I.Spartina maritima has a very wide distribution in the northern hemisphere salt marshes crossing a wide variety of climatic environments. Therefore, it is not strange that some differences arise when observing the photosynthetic mechanisms of different populations inhabiting different latitudes. During this study it could be observed that climate is the most important factor controlling the photosynthetic traits...
Production of high FFA Jatropa curcas oil biodiesel using oscillatory flow reactor
Supriyono, S.; Dias, J. M. M.; Dragone, Giuliano; Sulistyo, H.Jatropa Curcas is one of the most feasible sources for biodiesel feedstock. Some advantages of Jatropa curcas oil are non edible, growing in arid soil, and high oil yield from their seed, while it’s disadvantage is tend to oxidized and form high Free Fatty Acid (FFA) due to the oil composition. Oscillatory Flow Reactor is useful when reaction should performed for a long time in a turbulence flow, the other adva...
Sedimentary processes on the NW Iberian continental Shelf since the late Little...
Martins, V.; Figueira, R.C.L.; França, E.J.; Ferreira, P.A.L.; Martins, P.; Santos, J.F.; Dias, J.M.A.; Laut, L.M.; Ferreira da Silva, E.; Rocha, F.The OMEX core CD110 W90, retrieved from the Douro Muddy Patch (DMP) off the River Douro in the north of Portugal, records the last ≈150 years, i.e. the period since the late Little Ice Age (LIA). The core chronology is mainly based upon 210Pb and 137Cs activities. Geochemical, granulometric and microfaunal (benthic foraminifera) data suggest the occurrence of precipitation changes which may have been, at least ...
Análises isotópicas de Sr e Nd e sua aplicação no estudo da proveniência de sed...
Santos, J. F.; Ribeiro, S.; Matinhas, C. S. P.; Martins, V.; Dias, J. M. A.; Rocha, F.O trabalho que agora se apresenta baseia-se fundamentalmente em medições das razões 87Sr/86Sr e 143Nd/144Nd na fração arenosa da componente detrítica de doze níveis selecionados ao longo do core KC 024-19 (181cm), recolhido no talude continental da Galiza (42°08’98’’ N; 10°29’96’’ W; 2765m de profundidade). Os níveis estudados correspondem quer a eventos de Heinrich (HE), quer a níveis sem IRD (“ice-rafted debr...
Nd isotope composition of marine sediments as a tracer for iceberg provenance i...
Martins, V.; Santos, J. F.; Ribeiro, S.; Rocha, F.; Mackensen, A.; Rey, D.; Rubio, B.; Dias, J. M. A.OMEX core KC 024-19 was studied aiming at to assess the influence of climate changes on the origin and transport of the sediments of the Galician continental slope, in the last 40 thousand years. The sampled sediments are composed mostly of silt and clay, but also include a coarser-grained (sand-sized) fraction, corresponding essentially to foraminifera tests. Another remarkable feature is the occurrence of fou...
Salt Fluxes in a Complex River Mouth System of Portugal
Vaz, N.; Silva, J.; Dias, J. M.Measurements of velocity and salinity near the mouth and head of the Espinheiro channel (Ria de Aveiro lagoon, Portugal) are used to study the local variation of physical water properties and to assess the balance, under steady conditions, between the seaward salt transport induced by river discharge and the landward dispersion induced by various mixing mechanisms. This assessment is made using data sampled dur...
Changes in paleotemperature and paleoproductivity over the last 40,000 years: N...
Martins, V.; Dias, J. M. A.; Moreno, J.; Salgueiro, E.; Mackensen, A.; Rubio, B.; Rey, D.; Magalhães, V.; Santos, J. F.; Rocha, F.; Laut, L.This work aims to identify changes in paleoceanographic conditions on the NW Iberian Continental Margin during the last ~40 ka BP. Paleotemperatures expressed as mean annual Sea Surface Temperature (SSTma) and paleoproductivities expressed as Export Productivity (Pexpma) were evaluated using the modern analog technique SIMMAX 28, based on planktonic foraminifera census counts. The study took into account the re...
Effects of 174 G/C polymorphism in the promoter region of the interleukin-6 gen...
Pereira,D.S.; Garcia,D.M.; Narciso,F.M.S.; Santos,M.L.A.S.; Dias,J.M.D.; Queiroz,B.Z.; Souza,E.R.; Nóbrega,O.T.; Pereira,L.S.M.We investigated the effect of -174 G/C single-nucleotide polymorphism in the promoter region of the IL6 gene on plasma IL-6 levels and muscle strength, and the relationship between IL-6 levels and muscle strength in elderly women. The sample consisted of 199 elderly residents (73.0 ± 7.8 years old) from rest homes and the community in Belo Horizonte, MG, Brazil. -174 G/C polymorphism was determined by direct se...
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