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| Registros recuperados: 48 | |
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| Suárez Álvarez, G.. |
| Este trabajo trata de presentar los efectos tóxicos de cuatro posibles contaminantes de la plataforma cubana, un plaguicida órgano clorado el DDT y 3 metales, el cromo, el cobre y el plomo, sobre postlarvas de langosta P. argus y el camarón P. notialis. Persiguiendo un triple propósito en sus objetivos, presentar de una forma cómoda, con fines didácticos la resolución de los tres métodos de trabajo adoptados internacionalmente para evaluar la toxicidad, el método gráfico semi logarítmico, rutinario o estándar, el método de los Probits de Bliss y la modificación de Licthfield y wilcoxon, así como analizar de dichas metodologías cual es la más adecuada para la evaluación de los efectos de cualquier contaminante con mayor precisión estadística y conocer los... |
| Tipo: Theses and Dissertations |
Palavras-chave: Toxicity; Heavy metals; Metals; Toxicity; Heavy metals; Metals; Http://aims.fao.org/aos/agrovoc/c_7826; Http://aims.fao.org/aos/agrovoc/c_2223; Http://aims.fao.org/aos/agrovoc/c_29036. |
| Ano: 1996 |
URL: http://hdl.handle.net/1834/2610 |
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| Geret, F; Cosson, Rp. |
| Heavy metals (Cd, Cu, Hg and Zn) and metallothionein levels were determined in oysters Crassostrea gigas from two sites: the Gironde Estuary (contaminated site) and Bourgneuf Bay (uncontaminated site). Metallothionein levels led us to suspect the presence of cadmium in the environment when quantified in the gills. Soluble cadmium and metallothioneins were positively correlated in the digestive gland of oysters from Gironde (contaminated site), but metallothionein levels in this organ were not significantly different from levels observed in the digestive gland of oysters from Bourgneuf Bay (uncontaminated site). Conversely, no correlation was noticed between metals and metallothioneins in the gills of oysters from Gironde despite metallothionein levels... |
| Tipo: Text |
Palavras-chave: Métallothionéines; Métaux; Crassostrea gigas; Biomarqueur; Metallothioneins; Metals; Crassostrea gigas; Biomarker. |
| Ano: 2000 |
URL: http://archimer.ifremer.fr/doc/00324/43561/44058.pdf |
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| Radford Knoery, Joel; German, C; Charlou, Jean-luc; Donval, Jean-pierre; Fouquet, Yves. |
| Through the deep ocean, hydrothermal plumes disperse high concentrations of key chemical tracers including He-3, CH4, Mn, Fe, H2S, etc. This paper focuses on the distribution and behavior of total dissolved sulfide (sulfide hereafter) in hydrothermal plumes to show that its plume concentration decreases to subnanomolar a few kilometers from the vents. We also report on sulfide removal rates determined at in situ conditions; we observe that they are two orders of magnitude greater than for open ocean seawater, consistent with sulfide being detected only in the vicinity of hydrothermal vents. From our observations, we infer that the sole presence of sulfide in hydrothermal plumes locates active venting at the kilometer scale. |
| Tipo: Text |
Palavras-chave: Chemical oceanography; Mid ocean ridges; Metals; Helium isotopes; Methane; Tracers; Hydrogen sulphide; Plumes; Hydrothermal activity. |
| Ano: 2001 |
URL: https://archimer.ifremer.fr/doc/2001/publication-688.pdf |
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| Olivares,Elizabeth. |
| Tithonia diversifolia, a ruderal weedy species utilized in agroforestry, is widely distributed in the tropics, often being found in wasteland, margins of polluted city rivers and roadsides. The objective of this study was to compare plants sampled at a light and heavy traffic roadside for metal concentration and foliar compounds which may be related to senescence and/or detoxification of metals. The field survey was followed by an experiment in pots of Pb-acetate-supplemented soil to verify if the same response is obtained under controlled conditions with regard to Pb. The concentration of Pb in leaves and roots of plants sampled at a heavy traffic roadside was higher than in samples from a light traffic site. The content of Cr, Al, Fe, Cu and Ni was also... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Asteraceae; Metals; Mexican sunflower; Phenols; Pollution; Weeds. |
| Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202003000300004 |
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| Bouheiry, A.. |
| A short introduction provides some information about the Iron Library, a foundation of Georg Fischer Ltd, at Schaffhausen, which was established in 1949, to enable scientists and students the study of its historic collection, which is mainly concentrated on mining and metals, but includes all other related fields. Some outstanding details about the collection will be presented. The main topic of the contribution will be the research of Johann Jacob Scheuchzer (1672-1733) in the Swiss Alps. His research interests were similar to those of the well known universal scientist Conrad Gessner (1516-1565) and Johann Jakob Wagner (1641-1695), considered to be pioneers of the Alpine research in Switzerland. It is followed by biographical statements about Johann... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Iron Libray; Scheuchzer; Alpine geology; Metals; 38.52. |
| Ano: 2004 |
URL: http://www.repository.naturalis.nl/record/215372 |
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| Rifaat, A.E.. |
| The sediment samples that are collected during R/V CHAIN 1975 cruise to the southeastern Mediterranean have been used to determine the major controls of metals’distribution. The sediment samples were analysed mineralogically, chemically and texturally. The parameters measured included carbonate minerals, total carbonate, organic carbon, iron, manganese, copper, zinc, chromium, lead, nickel, cobalt, vanadium, calcium, magnesium, strontium, sand, silt and clay. The statistical analysis of data showed that four major factors control the distribution of metals in sediments of the Nile cone; These are: Factor 1 terrigenous mud-calcareous sand; Factor 2 Aragonite mud-terrigenous sand; Factor 3 Algal sand; and Factor 4 Aragonite. The percentages of terrigenous... |
| Tipo: Journal Contribution |
Palavras-chave: Sediment; Metals; Factor Analysis Coastal oceanography Sediments. |
| Ano: 2005 |
URL: http://hdl.handle.net/1834/1259 |
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| Gagneux Moreaux, Sindy; Cosson, Richard P.; Bustamante, Paco; Moreau, Christophe. |
| The Bay of Bourgneuf, France, is a main site of shellfish production. In the marshes along the bay, oyster intensive rearing and fattening need the mass production of microalgae. Salt groundwaters, available in this region, support a large part of this production for aquaculture. Studies carried out by local authorities have brought to the fore the accumulation of lead (Pb) in several samples of algal pastes derived from cultures using salt groundwater. The aim of this study was to compare growth, nutritional value and metal (Cd, Cu, Pb and Zn) uptake of four microalgae grown in two salt groundwaters or in enriched coastal seawater. Cultures of microalgae used in aquaculture (Haslea ostrearia, Phaeodactylum tricornutum, Skeletonema costatum and Tetraselmis... |
| Tipo: Text |
Palavras-chave: Marine microalgae cultivation; Aquaculture; Metals; Growth; Prasinophycea; Bacillariophycea; Diatom; Bioaccumulation; Trace elements; Saline groundwater. |
| Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/2006/publication-2135.pdf |
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| ARREDONDO,MIGUEL; MARTÍNEZ,RONNY; NÚÑEZ,MARCO T; RUZ,MANUEL; OLIVARES,MANUEL. |
| Interactions of micronutrients can affect absorption and bioavailability of other nutrients by a number of mechanisms. In aqueous solutions, and at higher uptake levels, competition between elements with similar chemical characteristics and uptake process can take place. The consequences of these interactions may depend on the relative concentrations of the nutrients. In this work, we measure the effects of increasing concentrations of iron, zinc, and copper on iron and copper uptake in Caco-2 cells. Intracellular Fe or Cu levels were affected by incubating with increased concentrations of metals. However, when the cells already had different intracellular metal concentration, the uptake of Fe or Cu was nor affected. In competition studies, we showed that... |
| Tipo: Journal article |
Palavras-chave: Competition; Interaction; Metals; Uptake. |
| Ano: 2006 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602006000100011 |
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| Kojadinovic, Jessica; Potier, Michel; Le Corre, Matthieu; Cosson, Richard P.; Bustamante, Paco. |
| Trace elements were analyzed in fish of commercial interest to determine their importance in marine systems of the Western Indian Ocean and their bioaccumulation patterns. The results are equivalent or lower than levels reported in ichthyofauna worldwide. Certain values of muscular Cd, Hg, Pb and Zn were, however, above thresholds for human consumption. Levels varied among tissues, species and fish length, but were seldom influenced by the nutritional condition of the fish, its gender and its reproductive status. Correlations between hepatic Hg and Se levels in Swordfish (r(2) = 0.747) and Yellowfin Tunas (r(2) = 0.226), and among metallothionein linking metals imply the existence of detoxification processes in these species. Level differences between fish... |
| Tipo: Text |
Palavras-chave: Guidelines; Detoxification; Contamination; Fish; Metals. |
| Ano: 2007 |
URL: http://archimer.ifremer.fr/doc/2007/publication-2490.pdf |
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| Sarradin, Pierre-marie; Lannuzel, D; Waeles, M; Crassous, Philippe; Le Bris, Nadine; Caprais, Jean-claude; Fouquet, Yves; Fabri, Marie-claire; Riso, R. |
| The distribution of Fe, Cu, Zn, Pb, Cd between the dissolved (<2 mu m) and the particulate (>2 mu m) fractions was measured after in-situ filtration in two hydrothermal habitats. The total metal concentration ranges exhibit a clear enrichment compared with the seawater concentration, accounting for the hydrothermal input for all the metals considered. Iron is the predominant metal (5-50 mu M) followed by Zn and Cu. Cd and Pb are present at the nM level. At the scale studied, the behavior of temperature, pH and dissolved iron is semi-conservative whereas the other dissolved and particulate metals are characterized by non-conservative patterns. The metal enrichment of the >2 mu m fraction results from the settlement and accumulation of particulate... |
| Tipo: Text |
Palavras-chave: Hydrothermal fauna; Habitats; Particulate; Dissolved; Metals. |
| Ano: 2008 |
URL: http://archimer.ifremer.fr/doc/2008/publication-3830.pdf |
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| Cosson, R; Thiebaut, E; Company, R; Castrec Rouelle, M; Colaco, A; Martins, I; Sarradin, Pierre-marie; Bebianno, M. |
| The variability of the bioaccumulation of metals (Ag, Cd, Cu, Fe, Mn and Zn) was extensively studied in the mussel Bathymodiolus azoricus from five hydrothermal vent sites inside three main vent fields of increasing depth along the Mid-Atlantic Ridge: Menez Gwen, Lucky Strike and Rainbow. Metal bioaccumulation varied greatly between vent fields and even between sites inside a vent field with B. azoricus showing a great capacity to accumulate metals. The bioaccumulation of these metals also varied significantly among tissues. The main target was the gills where metals were mainly associated with soluble compounds whereas in the digestive gland they were mainly associated with insoluble compounds. Storage of metals under insoluble forms in B. azoricus seems... |
| Tipo: Text |
Palavras-chave: Bathymodiolus; Mytilids; Hydrothermal vents; Azores; Metals; Bioaccumulation. |
| Ano: 2008 |
URL: http://archimer.ifremer.fr/doc/2008/publication-3954.pdf |
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| Idardare, Zaina; Chiffoleau, Jean-francois; Moukrim, A; Alla, A; Auger, Dominique; Lefrere, L; Rozuel, Emmanuelle. |
| Metal concentrations were measured monthly during an annual cycle (December 2004 to January 2006) in the tissues of Nereis diversicolor ragworms and sediment from two Moroccan Atlantic coastal lagoons: Oualidia in the north, situated in a highly industrialised urban area and Khnifiss in the south, far from anthropogenic influences. Relatively high levels of Zn, Ag and Cd were found in the sediment of Oualidia lagoon, while Ni concentrations were shown to be high at Khnifiss. The significant metal levels at Oualidia are a result of industrial and urban discharges, coupled with discharges from adjacent phosphate ore processing plants. Trace metal concentrations in worms vary according to season; they are usually high in winter and spring, in relation to the... |
| Tipo: Text |
Palavras-chave: Morocco; Coastal lagoons; Sediments; Nereis diversicolor; Metals. |
| Ano: 2008 |
URL: http://archimer.ifremer.fr/doc/2008/publication-6127.pdf |
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| Registros recuperados: 48 | |
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