|
|
|
| Registros recuperados: 48 | |
|
|
| Vidal Fernández, Judith Estela. |
| Este trabajo evaluó la respuesta de la simbiosis tripartita Rhizobium-leguminosa-micorriza arbuscular en presencia de vanadio (V) y níquel (Ni). El trabajo se dividió en dos fases experimentales; la primera fase estudió el comportamiento de la simbiosis Rhizobium tropici-Phaseolus vulgaris ante concentraciones de V o Ni (0, 25, 50, 75, 100 y 120 mg L-1) y su efecto en el contenido elemental en nódulos, en un sistema de bolsa de crecimiento bajo condiciones controladas (25°C, 70% HR y 12h de fotoperiodo) durante 30 días. En las plantas con V, la nodulación inició al cuarto día después de la inoculación y tuvo un máximo de 40 nódulos por planta en el testigo y 6 nódulos en las concentraciones de 50 y 100 mg L-1. La mayor actividad nitrogenasa (AN) se... |
|
Palavras-chave: Nodulación; Metales; Fitorremediación; Simbiosis; Phaseolus; Rhizophagus; Nodulation; Metals; Phytorremediation; Symbiosis; Edafología; Maestría. |
| Ano: 2012 |
URL: http://hdl.handle.net/10521/753 |
| |
|
|
| 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 |
| |
|
|
| Gourlay, Catherine; Gonzalez, Jean-louis. |
| The Water European Framework Directive requires the implementation of programs to monitor the chemical quality of water bodies (freshwater, transition water and seawater), based on grab measurements of concentrations of various contaminants (metals, organic compounds). The results are limited by several analytical difficulties, and the poor representativity because of the temporal variability of contamination. The passive sampling techniques, which basically consist of concentrating substances on a submerged device for a given period, and analyzing accumulated substances, should improve the monitoring, by simplifying analytical issues (lower detection limits, analysis in a simpler matrix), and allowing time integration of the contamination. Here, we... |
| Tipo: Text |
Palavras-chave: Échantillonneurs passifs; Eau; Membrane semi-perméable (SPMD); Gradient de diffusion en couche mince (DGT); Métaux; HAP; Passive samplers; Water; Semipermeable membrane device (SPMD); Diffusive gradient in thin film (DGT); Metals; PAHs. |
| Ano: 2010 |
URL: https://archimer.ifremer.fr/doc/00077/18850/16423.pdf |
| |
|
| |
|
|
| Martins, I.; Colaco, A.; Santos, Raphael; Lesongeur, Francoise; Godfroy, Anne; Sarradin, Pierre-marie; Cosson, R. P.. |
| The edifice walls of the Eiffel Tower hydrothermal vent site (Mid-Atlantic Ridge, Lucky Strike vent field) are populated with dense communities of dual symbioses harboring vent mussel Bathymodiolus azoricus, some of which are covered by white filamentous mats belonging to sulfur-oxidizing bacteria. Mussels were collected in both the presence and absence of the filamentous bacteria. A sample of the filamentous bacteria was collected and water measurements of temperature, CH4 and H2S were recorded at the collection area. The whole soft tissues were analyzed for total lipid, carbohydrate and total protein. Metallothioneins and metals (Cu, Fe and Zn) levels were determined in the major organs. The results showed no significant physiological and toxicological... |
| Tipo: Text |
Palavras-chave: Vent mussel; Metals; Metallothioneins; Filamentous bacteria; Eiffel Tower; Biomarkers. |
| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/2009/publication-6821.pdf |
| |
|
| |
|
|
| 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 |
| |
|
|
| Stachowski-haberkorn, Sabine; Guesdon, Stephane; Bechemin, Christian; Chiffoleau, Jean-francois; Brach-papa, Christophe; Soudant, Philippe; Beker, Beatriz; Jadas-hécart, Alain. |
| TOPHYPAC is a field study that was conducted in the Charente river estuary (Marennes-Oléron bay). The main goal was to assess the possible impact of chemical contamination with copper and pesticides on phytoplankton communities. Physical, chemical (nutrients, metals and pesticides) and biological (phytoplankton community) parameters were monitored in the field during three years, from 2011 to 2014. In 2012 and 2013, field sampling was coupled with experimental exposure of phytoplankton communities to copper and to an herbicide cocktail, after transportation to the lab: the effects were assessed using photosynthesis endpoint and cellular densities. TOPHYPAC allowed to set the framework of Charente estuary contamination with pesticides: herbicides glyphosate... |
| Tipo: Text |
Palavras-chave: Continuum eau douce/eau côtière; Pesticides; Métaux; Communautés phytoplanctoniques; Efficacité de photosynthèse; PICT; Tolérance; Cytométrie en flux; Toxicité chronique; Freshwater/coastal water continuum; Pesticides; Metals; Phytoplankton communities; Photosynthesis efficiency; PICT; Tolerance; Flow cytometry; Chronic toxicity. |
| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00300/41115/40289.pdf |
| |
|
|
| 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 |
| |
|
|
| Haberkorn, Hansy; Lambert, Christophe; Le Goic, Nelly; Quere, Claudie; Bruneau, A; Riso, Ricardo; Auffret, Michel; Soudant, Philippe. |
| Effects of simultaneous exposure of Pacific oyster, Crassostrea gigas, to both a harmful dinoflagellate that produces Paralytic Shellfish Toxins (PST), Alexandrium minutum, and cadmium (Cd) and copper (Cu), were assessed. Oysters were exposed to a mix of Cd-Cu with two different diets (i.e. A. minutum or Tisochrysis lutea) and compared to control oysters fed A. minutum or T. lutea, respectively, without metal addition. Metals and PST accumulations, digestive gland lipid composition, and cellular and biochemical hemolymph variables were measured after 4 days of exposure. Oysters exposed to Cd-Cu accumulated about thirty-six times less PSTs than oysters exposed to A. minutum alone. Exposure to Cd-Cu induced significant changes in neutral lipids (increase in... |
| Tipo: Text |
Palavras-chave: Harmful algae; Metals; Oysters; Toxin accumulation; Physiological effects. |
| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00169/28071/26286.pdf |
| |
|
| |
|
| |
|
| |
|
|
| 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 |
| |
|
| |
|
| |
|
| |
|
| |
|
| |
|
|
| 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 |
| |
| Registros recuperados: 48 | |
|
|
|
