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Multi-disciplinary investigation of fluid seepage on an unstable margin: The case of the Central Nile deep sea fan ArchiMer
Bayon, Germain; Loncke, L.; Dupre, Stephanie; Caprais, Jean-claude; Ducassou, E.; Duperron, Sebastien; Etoubleau, Joel; Foucher, Jean-paul; Fouquet, Yves; Gontharet, S.; Henderson, G. M.; Huguen, Caroline; Klaucke, I.; Mascle, J.; Migeon, S.; Olu-le-roy, Karine; Ondreas, Helene; Pierre, C.; Sibuet, Myriam; Stadnitskaia, A.; Woodside, J..
We report on a multidisciplinary study of cold seeps explored in the Central Nile deep-sea fan of the Egyptian margin. Our approach combines in situ seafloor observation, geophysics, sedimentological data, measurement of bottom-water methane anomalies, pore-water and sediment geochemistry, and Th-230/U dating of authigenic carbonates. Two areas were investigated, which correspond to different sedimentary provinces. The lower slope, at similar to 2100 m water depth, indicates deformation of sediments by gravitational processes, exhibiting slope-parallel elongated ridges and seafloor depressions. In contrast, the middle slope, at similar to 1650 m water depth, exhibits a series of debris-flow deposits not remobilized by post-depositional gravity processes....
Tipo: Text Palavras-chave: Authigenic carbonate; U Th; Cold seep; Continental margin; Nile.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/publication-6586.pdf
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Practices and Lessons Learned in Coping with Climatic Hazards at the River-Basin Scale: Floods and Droughts Ecology and Society
Krysanova, Valentina; Potsdam Institute for Climate Impact Research; krysanova@pik-potsdam.de; Buiteveld, Hendrik; Center for Water Management; h.buiteveld@riza.rws.minvenw.nl; Haase, Dagmar; UFZ - Helmholtz Centre for Environmental Research; dagmar.haase@ufz.de; Hattermann, Fred F; Potsdam Institute for Climate Impact Research; hattermann@pik-potsdam.de; van Niekerk, Kate; Institute of Natural Resources; VanNiekerk@ukzn.ac.za; Roest, Koen; Alterra - Wageningen University and Research Centre; Koen.Roest@wur.nl.
Climatic hazards such as floods and droughts have always been a primary matter of concern for human populations. Severe floods damage settlements, transport networks, and arable land. Although devastating droughts are harmful primarily for agriculture and terrestrial ecosystems, they can also lead to local water supply shortages. Despite significant achievements in science and technology and success stories in environmental management in the 20th century, people still continue to suffer the consequences of climate hazards worldwide. This paper provides an overview of existing practices for coping with floods and droughts, compares strategies in different river basins, and outlines the areas that need improvement. First, the existing protection measures and...
Tipo: Peer-Reviewed Reports Palavras-chave: Amudarya; Climate change; Climatic hazards; Coping strategy; Drought; Elbe; Flood; Guadiana; Nile; Orange; Rhine; Tisza; Water resources management.
Ano: 2008
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Selenium determination in tissue samples of Nile tilapia using ultrasound-assisted extraction. Repositório Alice
SILVA, F. A.; PADILHA, C. C. F.; CASTRO, G. R. de; ROLDAN, P. dos S.; NOGUEIRA, A. R. de A.; MORAES, P. M.; PADILHA, P. M..
This paper proposes a method to determine selenium in samples of fish muscle and liver tissue using ultrasound assisted extraction process, and analysed by graphite furnace atomic absorption spectrometry (GFAAS). The selenium content was extracted by 0.10 M HCl at the optimal extraction conditions which were established as follows: sample mass of 100 mg; granulometry of the sample <60 ?m; sonication time of five 40 s cycles; and sonication power of 136 W. The selenium determinations were performed by GFAAS, at a drying temperature of 120oC/250oC, pyrolysis temperature of 1300oC, atomization temperature of 2300oC, and cleaning temperature of 2800oC. Palladium nitrate was used as a chemical modifier coinjected with the samples, and tungsten as a permanent...
Tipo: Artigo de periódico Palavras-chave: Selenium extraction; Graphite furnace atomic absorption spectrometry; Essentiality of Selenium; Nile; Fish nutrition.
Ano: 2010 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/871370
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