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| Registros recuperados: 80 | |
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| Rivera Olivares, Laura Yolanda. |
| En un primer experimento se evaluó la aclimatación de vitroplantas de caña de azúcar de las variedades MEX69290 y CP722086 en tres sustratos; 1) TBZ: tezontle + bagazo de caña, 2) TCA: Tezontle + cascarilla de arroz y 3) TCZ: tezontle + cachaza; las mezclas en éstos en una proporción 40/60 (v/v). Las variables evaluadas fueron porcentaje de sobrevivencia, altura de plántula, diámetro de tallo, biomasa seca, azúcares solubles totales y concentración nutrimental. Las últimas tres variables fueron evaluadas en los vástagos y raíces. Se utilizó un diseño experimental completamente al azar con cincuenta repeticiones por tratamiento. A los 30 d, la menor sobrevivencia de la variedad MEX69290 fue de 84%;, mientras que la de CP722086 de 64%; en ambos casos en el... |
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Palavras-chave: Aclimatación; Cadmio; Saccharum officinarum; Vitroplantas; Acclimation; Cadmium; Plantlets; Edafología; Maestría. |
| Ano: 2011 |
URL: http://hdl.handle.net/10521/562 |
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| Rivera Olivares, Laura Yolanda. |
| En un primer experimento se evaluó la aclimatación de vitroplantas de caña de azúcar de las variedades MEX69290 y CP722086 en tres sustratos; 1) TBZ: tezontle + bagazo de caña, 2) TCA: Tezontle + cascarilla de arroz y 3) TCZ: tezontle + cachaza; las mezclas en éstos en una proporción 40/60 (v/v). Las variables evaluadas fueron porcentaje de sobrevivencia, altura de plántula, diámetro de tallo, biomasa seca, azúcares solubles totales y concentración nutrimental. Las últimas tres variables fueron evaluadas en los vástagos y raíces. Se utilizó un diseño experimental completamente al azar con cincuenta repeticiones por tratamiento. A los 30 d, la menor sobrevivencia de la variedad MEX69290 fue de 84%;, mientras que la de CP722086 de 64%; en ambos casos en el... |
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Palavras-chave: Aclimatación; Cadmio; Saccharum officinarum; Vitroplantas; Acclimation; Cadmium; Plantlets; Edafología; Maestría. |
| Ano: 2011 |
URL: http://hdl.handle.net/10521/562 |
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| Gonzalez, Jean-louis; Dange, Catherine; Thouvenin, Benedicte. |
| In estuarine environment, cadmium has a nonconservative behavior. It can be present under various species: dissolved (mineral and organic complexes), colloidal and particulate forms (adsorbed, precipitated), or integrated by various mechanisms in the organisms. This distribution is the result of processes (physical, chemical and biological) which are controlled by many factors (salinity, pH, Eh, nature and concentration of suspended matter, primary production). Geochemical modeling is a very useful approach to understand the dynamics of this type of contaminant, especially in the complex systems which are the estuaries. A speciation model was used to simulate the measurements taken (dissolved and particulate Cd) during various cruises carried out in the... |
| Tipo: Text |
Palavras-chave: Cadmium; Estuary; Speciation; Modeling; Surface complexation; Cadmium; Estuaire; Spéciation; Modélisation; Complexation de surface. |
| Ano: 2001 |
URL: https://archimer.ifremer.fr/doc/00480/59120/61749.pdf |
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| Baffard, Vincent. |
| Différents travaux menés depuis 1984 chez l'huître creuse en particulier, montrent qu'i existe, dans les branchies (Thiriot-Quiévreux C., 1982), une certaine proportion de cellules possédant un nombre de chromosomes inférieur au nombre habituel 2N=20. Ce phénomène est l'aneuploïdie. Cette anomalie cytogénétique est mise en évidence par un comptage de chromosomes d'une suspension cellulaire obtenue à partir de branchies. Il est apparu que le taux d'aneuploïdie affectait négativement les taux de croissance (Leitao & al. 2001). Il existe deux types d'origines possibles à l'aneuploïdie. La première peut être génétique (Leitao & al. 2001), et la seconde environnementale. L'effet de l'atrazine sur l'aneuploïdie a déjà fait l'objet de travaux. Il existe... |
| Tipo: Text |
Palavras-chave: Génétique; Aneuploïdie; Huître creuse; Crassostrea gigas; Mercure; Cadmium; Atrazine; Impact. |
| Ano: 2002 |
URL: http://archimer.ifremer.fr/doc/00033/14405/11698.pdf |
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| Metian, M; Warnau, M; Oberhansli, F; Teyssie, J; Bustamante, Paco. |
| The uptake and loss kinetics of Cd were determined in two species of scallops from the European coasts, the variegated scallop Chlamys varia and the king scallop Pecten maximus, following exposures via seawater, phytoplankton and sediment using highly sensitive radiotracer techniques (Cd-109). Results indicate that, for seawater and dietary pathways, C. varia displays higher bioaccumulation capacities in terms of uptake rate from water and fraction absorbed from ingested food (assimilation efficiency) than Pecten maximus. Regarding sediment exposure, P. maximus displayed low steady-state Cd transfer factor (TFSS < 1); however, once incorporated, a very large part of Cd transferred from sediment (92%) was strongly retained within R maximus tissues.... |
| Tipo: Text |
Palavras-chave: Subcellular distribution; Scallops; Metal; Kinetics; Cadmium; Bivalves. |
| Ano: 2007 |
URL: http://archimer.ifremer.fr/doc/2007/publication-3581.pdf |
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| Piquet, Jean-come. |
| Tout coquillage mis en vente est issu d’une zone de production (gisement naturel ou concession) classée et surveillée au niveau sanitaire. Quatre classements sont définis de A à D par ordre décroissant de salubrité, du classement A (bonne qualité) autorisant la commercialisation directe des coquillages, au classement D (très mauvaise qualité). Pour définir ce classement, une étude sanitaire est préalablement conduite par l’Ifremer sur demande de l’Administration. L’étude sanitaire réalisée à Bonne Anse en Charente-Maritime, a abouti en 2009 à un arrêté préfectoral classant en B le gisement de palourdes. Aujourd’hui, la qualité sanitaire de la zone est surveillée régulièrement par l’Ifremer, et environ 25 pêcheurs à pied professionnels exploitent le gisement. |
| Tipo: Text |
Palavras-chave: Etude sanitaire; Pêche à pied professionnelle; Charente-Maritime; Bonne Anse; Escherichia coli; Cadmium. |
| Ano: 2011 |
URL: http://archimer.ifremer.fr/doc/00048/15965/13405.pdf |
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| Lacoue Labarthe, T; Warnau, A; Oberhansli, F; Teyssie, J; Koueta, Noussithe; Bustamante, Paco. |
| Cuttlefish eggs were exposed to background concentrations of dissolved Ag and Cd, using the radiotracers Ag-110m and Cd-109. At different time of the embryonic development (50 days), some eggs were placed in non-contaminating conditions. During the experiment, the uptake and depuration kinetics, and distribution of these metals among the egg compartments (i.e. eggshell, vitellus, peri-vitelline fluid and embryo) were assessed. In parallel, experiments were conducted with sub-lethal concentrations of stable Ag and Cd (2 and 1 mu g l(-1), respectively) to compare the metal behaviour at higher concentrations. From the spawning date up to I month of development, both metals were taken up efficiently by the eggs, reaching load/concentration ratio (LCR) of 1059... |
| Tipo: Text |
Palavras-chave: Cephalopod; Permeability; Eggshell; Embryo; Biokinetics; Silver; Cadmium. |
| Ano: 2008 |
URL: http://archimer.ifremer.fr/doc/2008/publication-3882.pdf |
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| Lanceleur, Laurent; Schaefer, Joerg; Chiffoleau, Jean-francois; Blanc, Gerard; Auger, Dominique; Renault, Sophie; Baudrimont, Magalie; Audry, Stephane. |
| The Gironde fluvial estuarine system is impacted by historic metal pollution (e.g. Cd, Zn, Hg) and oysters (Crassostrea gigas) from the estuary mouth have shown extremely high Cd concentrations for decades. Based on recent work (Chiffoleau et al., 2005) revealing anomalously high Ag concentrations (up to 65 mg kg(-1); dry weight) in Gironde oysters, we compared long-term (similar to 1955-2001) records of Ag and Cd concentrations in reservoir sediment with the respective concentrations in oysters collected between 1979 and 2010 to identify the origin and historical trend of the recently discovered Ag anomaly. Sediment cores from two reservoirs upstream and downstream from the main metal pollution source provided information on (i) geochemical background... |
| Tipo: Text |
Palavras-chave: Silver; Cadmium; Estuary; Oyster; Biomonitoring. |
| Ano: 2011 |
URL: http://archimer.ifremer.fr/doc/00060/17109/15071.pdf |
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| Vincent-hubert, Francoise; Chatel, Amelie; Gourlay-france, Catherine. |
| We have previously shown that cadmium (Cd) and Benzo[a]pyrene (BaP) induced early DNA damages in zebra mussels, and that the level of DNA strand breaks (SB) returned to a basal level after 3 days of exposure to Cd. The aim of the present study was to go further in the mechanisms of Cd and BaP detoxification. For that purpose, expression of genes encoding for metallothionein (MT), Aryl Hydrocarbon Receptor (AHR), P-gP, catalase, glutathione S-transferase and Heat shock protein 70 (HSP70) proteins have been measured using RT-qPCR. Data reported here show that Cd is a strong inducer of MT and HSP70 genes, and that BaP is a strong inducer of P-gP and AHR genes. Exposure to Cd and BaP resulted in moderate changes in antioxidant enzymes mRNA. Since the increase... |
| Tipo: Text |
Palavras-chave: Benzo[a]pyrene; Cadmium; Metallothionein; Aryl hydrocarbon receptor; Antioxidant enzymes; RT-qPCR. |
| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00184/29547/27873.pdf |
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| Lahaye, V; Bustamante, Paco; Law, J.r; Learmonth, J.a; Santos, M.b.; Boon, J.p.; Rogan, E; Dabin, W; Addink, M.j.; Lopez, A; Zuur, A.f.; Pierce, G.j.; Caurant, Florence. |
| Selected trace elements (Cd, Cu, Hg, Se, Zn) were measured in the kidneys and the liver of 104 harbour porpoises (Phocoena phocoena) stranded along the coasts of France, Galicia (Spain), Ireland, Scotland (UK), and the Netherlands. Generally, relatively low concentrations of toxic elements were encountered in the tissues of European porpoises, except for two individuals, which displayed high hepatic Hg concentrations. Also, elevated Cd levels obtained in Scottish porpoises could be related to their feeding preferences and this result suggests an increase of the proportion of cephalopods in their diet with latitude. Moreover, significant geographical differences were seen in hepatic Zn concentrations; the elevated Zn concentrations displayed by porpoises... |
| Tipo: Text |
Palavras-chave: Tracers; Multivariate analysis; Diet; Age; Marine mammals; Zinc; Cadmium; Mercury; Heavy metals. |
| Ano: 2007 |
URL: http://archimer.ifremer.fr/doc/2007/publication-2920.pdf |
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| Registros recuperados: 80 | |
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