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| Registros recuperados: 42 | |
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| Balch, William M.; Bates, Nicholas R.; Lam, Phoebe J.; Twining, Benjamin S.; Rosengard, Sarah Z.; Bowler, Bruce C.; Drapeau, Dave T.; Garley, Rebecca; Lubelczyk, Laura C.; Mitchell, Catherine; Rauschenberg, Sara. |
| The Great Calcite Belt (GCB) is a region of elevated surface reflectance in the Southern Ocean (SO) covering similar to 16% of the global ocean and is thought to result from elevated, seasonal concentrations of coccolithophores. Here we describe field observations and experiments from two cruises that crossed the GCB in the Atlantic and Indian sectors of the SO. We confirm the presence of coccolithophores, their coccoliths, and associated optical scattering, located primarily in the region of the subtropical, Agulhas, and Subantarctic frontal regions. Coccolithophore-rich regions were typically associated with high-velocity frontal regions with higher seawater partial pressures of CO2 (pCO(2)) than the atmosphere, sufficient to reverse the direction of gas... |
| Tipo: Text |
Palavras-chave: Coccolithophores; Trace metals; Carbonate chemistry; Southern Ocean; Subantarctic Front; Subtropical Front. |
| Ano: 2016 |
URL: https://archimer.ifremer.fr/doc/00383/49412/49883.pdf |
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| Chia,Mathias Ahii; Bako,Sunday Paul; Alonge,Samson O; Adamu,Abu Kasim. |
| Green algal species and their association with physicochemical parameters in some manmade ponds in Zaria, Nigeria were studied from November 2005 to August 2006. Phytoplankton and water samples were collected, preserved and analyzed using standard methods. A total of 27 green algal species divided into 16 families were recorded. Shannon diversity indices ranged from 1.75 to 2.39 in all ponds, dominance index from 0.14 to 0.23 and species evenness 0.56 to 0.64. Closterium sp. and Rhizoclonium hookeri Kuetz. were positively associated with the concentration of Fe, however they were negatively correlated (sensitive) to alkalinity, total dissolved solids and electrical conductivity. Stichococcus bacillaris Naegeli, Staurastrum rotula Nordst. and Sphaeroplea... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Chlorophyta; Diversity; Ecology; Lenthic water bodies; Trace metals. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042011000300004 |
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| Batista,Adriana A.; Santos,Jorge A. G.; Bomfim,Marcela R.; Moreira,Flávia M.; Leal,Emylly F.; Conceição,Joseane N. da. |
| ABSTRACT Lead is a toxic metal that affects plant growth and the ecosystem. This study evaluated the lead (Pb) bioaccumulation potential of vetiver (Vetiveria zizanioides L.), sunflower (Helianthus annuus L.), elephant ear (Alocasia macrorrhiza) and ‘embaúba’ (Cecropia sp.). The plant species were tested in a 50% nutrient solution - Hoagland and Arnon, constantly aerated, containing five Pb concentrations: 0, 50, 100, 200 and 400 mg L-1). The treatments were arranged in a completely randomized design in a 4 x 5 factorial scheme, with four replicates. The Pb contents in the plants increased linearly with the Pb exposure concentration. Vetiver was the species with the highest Pb content in the shoots (260.24 mg kg-1) and sunflower, in the roots (44925.20 mg... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Trace metals; Remediation; Phytostabilization. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662017000500327 |
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| Conway, T. M.; John, S. G.; Lacan, F.. |
| Intercomparison of trace metal data is a key aspect of the International GEOTRACES program, allowing data from multiple laboratories and countries to be combined to produce high-resolution datasets for the oceans. The use of crossover stations by the GEOTRACES program provides the opportunity both for comparison of analytical techniques and assessment of temporal variability in the cycling of trace metals such as iron (Fe). Here, we present the first comparison of dissolved Fe stable isotope ratio (δ56Fe; relative to IRMM-014) profiles in the oceans, from re-occupations of three locations in the Atlantic Ocean; (1) the Bermuda Atlantic Time Series Station (31.75°N 64.17°W) during the U.S. GEOTRACES IC1 cruise (June 2008) and the U.S. GEOTRACES GA03 cruise... |
| Tipo: Text |
Palavras-chave: Trace metals; GEOTRACES; Biogeochemistry; Intercomparison. |
| Ano: 2016 |
URL: https://archimer.ifremer.fr/doc/00332/44330/43932.pdf |
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| Chetouhi, Cherif; Masseret, Estelle; Satta, Cecilia Teodora; Balliau, Thierry; Laabir, Mohamed; Jean, Natacha. |
| Over the past decades, the occurrence, distribution and intensity of harmful algal blooms involving the dinoflagellate Alexandrium pacificum have increased in marine coastal areas disturbed by anthropogenic inputs. This invasive species produces saxitoxin, which causes the paralytic shellfish poisoning syndrome in humans upon consumption of contaminated seafood. Blooms of A. pacificum have been reported in metal-contaminated coastal ecosystems, suggesting some ability of these microorganisms to adapt to and/or resist in metal stress conditions. This study seeks to characterize the modifications in membrane proteomes (by 2-D electrophoresis coupled to LC-MS/MS), cell growth and morphometry (measured with an inverted microscope), in response to metal stress... |
| Tipo: Text |
Palavras-chave: Alexandrium pacificum; Harmful algal bloom; Proteomics; Membrane pmteome; Trace metals. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00606/71802/70290.pdf |
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| Chouba, L.; Mzougui-Aguir, N.. |
| Dans l’objectif de déterminer l’état de la contamination organique et inorganique des sédiments superficiels de la frange côtière du golfe de Gabès, nous avons évalué les concentrations en hydrocarbures aromatiques totaux, en cadmium (Cd), en plomb (Pb) et en mercure (Hg). L’échantillonnage a été effectué à bord d’une barque motorisée, à l’aide d’une benne Van Veen au niveau de 25 stations. Les concentrations du Cadmium et du Plomb ont été déterminées par Spectrométrie d’Absorption Atomique à Four Graphite (Varian 220Z) alors que pour le Mercure les analyses ont été réalisées par Spectrométrie d’Absorption Atomique à vapeur froide. Les hydrocarbures totaux ont été analysés par UV-Fluorescence (UV-F). Les concentrations du Cadmium et du Mercure dans la... |
| Tipo: Journal Contribution |
Palavras-chave: Cadmium; Coastal waters; Hydrocarbons; Lead; Marine pollution; Mercury; Pollution monitoring; Sediments; Trace metals. |
| Ano: 2006 |
URL: http://hdl.handle.net/1834/4275 |
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| Casas, Stellio. |
| Monitoring coastal contamination of trace metals using bivalve molluscs as quantitative bioindicators is widely used in many international monitoring programs. The bioaccumulation of metal within an organism results from the interaction between physiological (growth, loss of weight, absorption, accumulation), chemical (metal concentration, speciation, bioavailability) and environmental factors (temperature, SPM, chlorophyll). By utilizing the parameters above in this study, it appears that modeling metal dynamics in marine mussels is a reliable tool. The model allows understanding the bioaccumulation process which results from the interactions between biological, chemical and environmental factors. One of the objective of this study was to couple a... |
| Tipo: Text |
Palavras-chave: Biomonitoring; Dynamic Energy Budget; Model; Trace metals; Bioaccumulation; Mytilus galloprovincialis; Mussel; Bioindicator; Surveillance; Budget énergétique dynamique; Modèle; Métaux traces; Bioaccumulation; Mytilus galloprovincialis; Moule; Bioindicateur. |
| Ano: 2005 |
URL: http://archimer.ifremer.fr/doc/2005/these-356.pdf |
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| Thouvenin, Benedicte. |
| The MET&OR module is a model, written in FORTRAN 90, which calculates the biogeochemical reactions between variables such as trace metal, radioactive tracers, organic or bacterial contaminants (biodegradation, decay, adsorption / desorption, photolysis, hydrolysis, volatilization, partition at equilibrium ..). It groups together classical reactions, described in the literature, to evaluate the source and sink terms which are integrated into the transport equations solved by a hydrodynamic model. It is intended more particularly for marine and coastal waters. This technical documentation aims to present the MET&OR module and the way in which it was coupled to the hydrodynamic model, in particular to MARS-3D. |
| Tipo: Text |
Palavras-chave: Modelisation; Biogéochimie; Contaminants métalliques; Organic contmainants; Contaminants bactériens; Modeling; Biogeochemical; Trace metals; Contaminants organiques; Bacterial contaminant. |
| Ano: 2021 |
URL: https://archimer.ifremer.fr/doc/00688/79972/83002.pdf |
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| Heimbuerger, Lars-eric; Cossa, Daniel; Thibodeau, Benoit; Khripounoff, Alexis; Mas, Virginie; Chiffoleau, Jean-francois; Schmidt, Sabine; Migon, Christophe. |
| The magnitude and the chronology of anthropogenic impregnation by Hg and other trace metals of environmental concern (V, Cr, Ni, Cu, Zn, Ag, Cd and Pb, including its stable isotopes) in the sediments are determined at the DYFAMED station, a site in the Ligurian Sea (Northwestern Mediterranean) chosen for its supposed open-sea characteristics. The DYFAMED site (VD) is located on the right levee of the Var Canyon turbidite system, at the end of the Middle Valley. In order to trace the influence of the gravity current coming from the canyon on trace metal distribution in the sediment, we studied an additional sediment core (VA) from a terrace of the Var Canyon, and material collected in sediment traps at the both sites at 20 m above sea bottom. The patterns... |
| Tipo: Text |
Palavras-chave: Marine sediments; Sediment traps; Mercury; Trace metals; Lead isotopes; Geochronology. |
| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00073/18435/16125.pdf |
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| Ali, Aasim. |
| Red Sea water samples were collected from the Sudanese coast at depths of 10 meter during June 2011 and analyzed for major and trace metals in addition to some inorganic anions. Sodium Na, potassium K, strontium Sr, magnesium Mg, calcium Ca, sulfur S, iron Fe, zinc Zn, manganese Mn, nickel Ni, copper Cu, cadmium Cd, cobalt Co, lead Pb, arsenic As, barium Ba, chromium Cr, europium Eu, lanthanum La, silicon Si, and titanium Ti were analyzed using inductively coupled plasma optical emission spectroscopy (ICP-OES) to determine their existing concentration, their distribution patterns, study the level of contamination in the Red Sea Sudanese coastal water, and the data of the analysis was used in the preparation of the Red Sea arti cial water which was used in... |
| Tipo: Theses and Dissertations |
Palavras-chave: Trace metals. |
| Ano: 2012 |
URL: http://hdl.handle.net/1834/4555 |
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| Migon, C; Gentili, B; Journel, B. |
| A correlation analysis based on the concept of singular-value decomposition of a matrix is applied here to an atmospheric aerosol data set, for twelve metals (Al, Ca, Cd, Co, Cu, Fe, Mg, Mn, Na, Ni, Pb and Zn),in the Ligurian Sea coastal environment. An iterative procedure allows atypical samples to be discarded, i.e. samples with characteristics significantly different to those of the whole data set. After five atypical samples have been objectively discarded, the general characteristics of the data set are better described and some features are enhanced according to a decreasing order of importance, For example, the mineral dust character of almost every metal is shown, which points out that the marine recycling component is negligible. Marine (Mg, Na)... |
| Tipo: Text |
Palavras-chave: Mer Ligure; Aérosol atmosphérique; Métaux-traces; Analyse statistique; Ligurian Sea; Atmospheric aerosol; Trace metals; Statistical analysis. |
| Ano: 2000 |
URL: http://archimer.ifremer.fr/doc/00325/43576/44044.pdf |
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| Ali, Aasim. |
| Red Sea water samples were collected from four stations in the Sudanese coast at depth of 10 m during July 2011 and analyzed for major ions and trace metals in order to determine their insitu concentration, their distribution patterns, and level of heavy metals contamination in the Sudanese coastal water. The data of the analysis was used in the preparation of the Red Sea artificial water which was used to study how salinity affects the photooxidation of 1,8-dimethylnaphthalene (1,8-DMN) and the water-soluble fraction (WSF) from Norwegian crude oil. The results show a small range of spatial variation for Na+, Mg2+, Ca2+, Cl−, K+, and SO2−4 . Also, the concentration of Na+, Mg2+, Ca2+, Cl−, and SO2−4 in the Sudanese coastal water is high compared to all... |
| Tipo: Theses and Dissertations |
Palavras-chave: Trace metals; Salinity effects. |
| Ano: 2012 |
URL: http://hdl.handle.net/1834/4624 |
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| Nozaki, Y; Yamada, M; Nakanishi, T; Nagaya, Y; Nakamura, K; Shitashima, K; Tsubota, H. |
| Presented here is the first detailed geochemical data set on the U/Th series Th, Pa, Ac, and Pb isotopes and artificial fallout radionuclides (Sr-90, Cs-137, and Pu isotopes), and some trace elements (V, Zn, Cd, Cu, Mn, and Ni) in two water columns of the Japan and Bonin trenches down to the bottom depths of 7585 m and 9750 m, respectively. Hydrographic properties such as temperature, salinity, dissolved oxygen, and nutrient content within the trench valley remain constant at the same levels as those in the bottom water of the Northwest Pacific basin (typically similar to 6000 m in depth). The radionuclide activities and most trace metal concentrations are also not very different from those in the overlying water at depths of around 5000-6000 m. This means... |
| Tipo: Text |
Palavras-chave: Uranium - thorium; Nucléide artificiel; Balayage; Métal-trace; Temps de résidence; U/Th series nuclides; Artificial radionuclides; Scavenging; Trace metals; Renewal of trench water. |
| Ano: 1998 |
URL: http://archimer.ifremer.fr/doc/00326/43669/43201.pdf |
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| Heimbuerger, Lars-eric; Migon, Christophe; Dufour, Aurelie; Chiffoleau, Jean-francois; Cossa, Daniel. |
| Climatic and anthropogenic changes are able to engender modifications in the aerosol composition at different geographical and temporal scales The present study addresses this question for the trace metal concentrations (TM = Al, Fe, Mn, Co, Ni, Cu, Pb, Cd and Zn) of aerosol from the North-western Mediterranean coast of France (Cap Ferrat, nearby Nice) between 1986 and 2008. From seasonal variations (2006-08) and decadal trends (1986-2008) of TM concentrations. three groups of elements can be distinguished They consist of different aerosol sources: crustal-derived elements (Al, Fe. Mn and Co), trace metals of anthropogenic origin (Pb, Cd and Zn) and a third, intermediate, group of trace metals that presented both anthropogenic and natural/crustal... |
| Tipo: Text |
Palavras-chave: Trace metals; Aerosols; Anthropic impact; Mediterranean; Anti-pollution policy. |
| Ano: 2010 |
URL: http://archimer.ifremer.fr/doc/00006/11688/8503.pdf |
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| BOUROTTE,CHRISTINE L.M.; SUGAUARA,LUCY E.; MARCHI,MARY R.R. DE; SOUTO-OLIVEIRA,CARLOS E.. |
| Abstract: The aim of this study is to discuss the concentration distribution, composition and possible sources of trace metals and 13 PAHs in topsoils of the University campus, in the city of São Paulo, the largest city of South America. Mineralogy and granulometry of topsoils (0-10 cm) samples, were determined and As, Ba, Cd, Co, Cr, Cu, Mo, Ni, Pb, Sb, V, Zn, Hg, Pt, Pd and PAHs concentrations were quantified in the bulk fraction. The average clay content of soils was 221±61.8 g kg-1 and total carbon was low (mean of 25 g kg-1). Concentrations of metals were generally lower than the reference value established by the São Paulo State Environmental Agency and other studies in the São Paulo urban area, except for Cd, Ni, Pb, Cr and Zn. The mean... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Urban topsoils; Trace metals; PAHs; PMF. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000500501 |
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| Registros recuperados: 42 | |
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