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- 저자 : Magalhã (검색결과 2 건)
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Duarte, D.,Magalhã,es, V.H.,Terrinha, P.,Ribeiro, C.,Madureira, P.,Pinheiro, L.M.,Benazzouz, O.,Kim, J.-H.,Duarte, H. Elsevier 2017 Marine and petroleum geology Vol.82 No.-
<P><B>Abstract</B></P> <P>Located on the West Iberian margin, between Cabo Carvoeiro and Cabo da Roca, the Estremadura Spur is a trapezoidal promontory elongated in an east-west direction, extending until the Tore seamount. Recently a field with more than 70 pockmarks was discovered in the NW region of the Estremadura Spur outer shelf (Lourinhã Monocline). Pockmarks are the seabed culminations of fluid migration through the sedimentary column and their characteristic seabed morphologies correspond to cone-shaped circular or elliptical depressions. The characterization of these features and the understanding of the associated fluid escape process are the main objectives of this work. Here we characterize these structures to understand their structural and stratigraphic control based on: 1) Seismic processing and interpretation of the high resolution 2D single-channel sparker seismic dataset, 2) Bathymetric and Backscatter interpretation and 3) ROV direct observation of the seafloor.</P> <P>The analysis of the seismic profiles allowed the identification of six seismic units, disturbed by the migration and accumulation of fluids. The Estremadura Spur outer shelf has been affected by several episodes of fluid migration and fluid escape during the Pliocene-Quaternary that are expressed by a vast number of seabed and buried pockmarks. At present, the pockmarks are mainly inactive, as the seabed pockmarks are covered by recent sediments. It is concluded that the migration of fluids to the seabed occurred over the Pliocene-Quaternary, as indicated by the buried pockmarks at different depths below the seabed. The vertical stacking of various pockmarks suggests a cyclical fluid flow activity that can possibly be the result of the eustatic sea level variations and the subsequent changes of the hydrostatic pressure.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The Estremadura Spur pockmark field is the first fluid seepage system identified in the West Iberian Margin. </LI> <LI> The Estremadura Spur outer shelf has been affected by several episodes of fluid migration and fluid escape, during the Pliocene-Quaternary. </LI> <LI> At present-day the pockmarks are mainly inactive, as the seabed pockmarks are recovered by recent sediments. </LI> </UL> </P>
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Rocha, Cristina M.R.,Sousa, Ana M.M.,Kim, Jang K.,Magalhã,es, Jú,lia M.C.S.,Yarish, Charles,Gonç,alves, Maria do Pilar Elsevier 2019 Food hydrocolloids Vol.89 No.-
<P><B>Abstract</B></P> <P> <I>Gracilaria tikvahiae</I>, an endemic western North Atlantic red alga, was cultivated for nutrient bioextraction in urbanized estuarine waters in Long Island Sound and the Bronx River Estuary, USA. This study assesses the feasibility of an integrated approach of using <I>G. tikvahiae</I> produced in this bioextraction system as sustainable biomass source for agar production. Agars were extracted after alkaline pre-treatment and characterized in terms of gelling strength, chemical composition, chemical structure and gel structure. Results indicated that this seaweed performed similar to other cultivated <I>Gracilaria</I> in terms of extraction yield and gelling strength of the agar. Differences between sites were not significant in terms of agar gel strength, though yield was higher at Long Island Sound. The extracted agars were sulfated, methylated and with no detectable pyruvate substituents. It is possible to use an integrated strategy of nutrient bioextraction in urbanized estuarine waters and agar exploitation with <I>G. tikvahiae</I>.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Agar was successfully extracted from <I>G. tikvahiae</I> used in the nutrient bioextraction systems in urbanized coastal waters. </LI> <LI> Extracted agar performance was similar to other <I>Gracilaria</I> agars. </LI> <LI> There were no significant differences in the gelling strength between the two cultivation sites. </LI> <LI> NMR profile and gel structure of the extracted agars was analyzed. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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