Refinar búsqueda
Resultados 2871-2880 de 62,508
Embryotoxic and genotoxic effects of heavy metals and pesticides on early life stages of Pacific oyster (Crassostrea gigas) Texto completo
2012
Mai, Hong Ngoc | Cachot, J. | Brune, J. | Geffard, Olivier | Belles, A. | Budzinski, H. | Morin, Brice | Environnements et Paléoenvironnements OCéaniques (EPOC) ; École Pratique des Hautes Études (EPHE) ; Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université de Bordeaux (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) | Milieux aquatiques, écologie et pollutions (UR MALY) ; Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)
Embryotoxic and genotoxic effects of heavy metals and pesticides on early life stages of Pacific oyster (Crassostrea gigas) Texto completo
2012
Mai, Hong Ngoc | Cachot, J. | Brune, J. | Geffard, Olivier | Belles, A. | Budzinski, H. | Morin, Brice | Environnements et Paléoenvironnements OCéaniques (EPOC) ; École Pratique des Hautes Études (EPHE) ; Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université de Bordeaux (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) | Milieux aquatiques, écologie et pollutions (UR MALY) ; Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)
[Departement_IRSTEA]Eaux [TR1_IRSTEA]BELCA | International audience | This study evaluated embryotoxicity and genotoxicity of two dissolved metals copper and cadmium (Cu and Cd) and two pesticides (metolachlor and irgarol) occurring in Arcachon Bay (SW France) in Pacific oyster (Crassostrea gigas) larvae and investigated the relationship between those two endpoints. Embryotoxicity was measured by calculating the percentage of abnormal D-shaped larvae and genotoxicity was evaluated with DNA strand breaks using the comet assay. After 24 h exposure, significant increases of the percentage of abnormal D-larvae and the DNA strand breaks were observed from 0.1µg/L for Cu, 10 µg/L for Cd and 0.01 µg/L for both irgarol and metolachlor in comparison with the controls. A strong positive relationship between embryotoxicity and genotoxicity was recorded for Cu, Cd and metolachlor. The current study suggests that copper, irgarol and metolachlor can induce larval abnormalities and DNA damage in a population of exposed oysters at environmentally relevant concentrations.
Mostrar más [+] Menos [-]Embryotoxic and genotoxic effects of heavy metals and pesticides on early life stages of Pacific oyster (Crassostrea gigas) Texto completo
2012
Mai Hương, | Cachot, Jérôme | Brune, Justine | Geffard, Oliver | Belles, Angel | Budzinski, Hélène | Morin, Bénédicte
This study evaluated embryotoxicity and genotoxicity of two dissolved metals copper and cadmium (Cu and Cd) and two pesticides (metolachlor and irgarol) occurring in Arcachon Bay (SW France) in Pacific oyster (Crassostrea gigas) larvae and investigated the relationship between those two endpoints. Embryotoxicity was measured by calculating the percentage of abnormal D-shaped larvae and genotoxicity was evaluated with DNA strand breaks using the comet assay. After 24h exposure, significant increases of the percentage of abnormal D-larvae and the DNA strand breaks were observed from 0.1μgL⁻¹ for Cu, 10μgL⁻¹ for Cd and 0.01μgL⁻¹ for both irgarol and metolachlor in comparison with the controls. A strong positive relationship between embryotoxicity and genotoxicity was recorded for Cu, Cd and metolachlor. The current study suggests that copper, irgarol and metolachlor can induce larval abnormalities and DNA damage in a population of exposed oysters at environmentally relevant concentrations.
Mostrar más [+] Menos [-]Towards a critical ozone flux for forest trees Texto completo
2010
Braun, Sabine | Emberson, Lisa | Bueker, Patrick | Schindler, Christian | Rihm, Beat | Goerg, Madeleine | Oksanen, Elina | Le Thiec, Didier, | Karlsson, Per Erik | Leuzinger, Sébastian
Correlations between dioxin-like and indicators PCBs: Potential consequences for environmental studies involving fish or sediment Texto completo
2009
Babut, M. | Miege, Cecile | Villeneuve, B. | Abarnou, A. | Duchemin, J. | Marchand, P. | Narbonne, J.F. | Biologie des écosystèmes aquatiques (UR BELY) ; Centre national du machinisme agricole, du génie rural, des eaux et forêts (CEMAGREF) | Qualité des eaux et prévention des pollutions (UR QELY) ; Centre national du machinisme agricole, du génie rural, des eaux et forêts (CEMAGREF) | Physiologie Fonctionnelle des Organismes Marins (PFOM) ; Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER) | Agence de l'Eau Seine-Normandie | École nationale vétérinaire, agroalimentaire et de l'alimentation Nantes-Atlantique (ONIRIS) | Laboratoire de Physico -& Toxico Chimie des systèmes naturels (LPTC) ; Université Sciences et Technologies - Bordeaux 1 (UB)-Centre National de la Recherche Scientifique (CNRS)
[Departement_IRSTEA]Eaux [TR1_IRSTEA]BELCA | Among the numerous PCB congeners, most of the dioxin-like PCBs (DL-PCBs) need to be characterized by hyphenated techniques. It has been shown in several instances that these congeners are well related to the total PCB content in fish.We examined datasets collected mainly in France, on freshwater and marine fish and sediments. A statistical model linking DL- and indicator PCBs was developed for a dataset composed of freshwater fishes, and proved to predict well DL-PCBs from indicator PCBs in all other fish sets, including marine ones. Type II error rates remained low in almost all fish sets. A similar correlation was observed in sediments. Non-dioxin-like PCBs elicit various adverse effects and represent 95% of the total PCBs. A European guideline for them is needed; the correlation between DL- and indicator PCBs could help develop this standard in the future.
Mostrar más [+] Menos [-]A Retrospective Isotopic Study of Spruce Decline in the Vosges Mountains (France) Texto completo
2003
Poszwa, Anne | Wickman, Tonie | Dambrine, Etienne | Ferry, Bruno | Dupouey, Jean-Luc | Helle, Gerdhard | Schleser, Gerdhard | Bréda, Nathalie | Institut National de la Recherche Agronomique (INRA) | KTH Royal Institute of Technology [Stockholm] (KTH) | Laboratoire d'Etudes des Ressources Forêt-Bois (LERFoB) ; Institut National de la Recherche Agronomique (INRA)-AgroParisTech | Ecologie et Ecophysiologie Forestières [devient SILVA en 2018] (EEF) ; Institut National de la Recherche Agronomique (INRA)-Université de Lorraine (UL) | Institut für Chemie und Dynamik der Geosphäre - Troposphäre (ICG-2) ; Forschungszentrum Jülich GmbH | Centre de recherche de Jülich | Jülich Research Centre (FZJ) ; Helmholtz-Gemeinschaft = Helmholtz Association-Helmholtz-Gemeinschaft = Helmholtz Association
International audience | The objective of this study was to assess the time variation of mineral and water stress levels across the life of a declining, Mg-deficient, spruce stand, in order to clarify the factors that caused the decline. Since 1985, strong soil acidification linked to a large leaching of nitrate and base cations was measured at the study site. In 1994, 5 trees were felled and tree rings were measured and analysed for Ca, Mg, K, Sr, 13 C/ 12 C and 87 Sr/ 86 Sr isotopic ratios. Strontium pools and fluxes as well as root Sr isotope ratio in relation to depth were also measured. Wood chemical concentrations and isotope ratios were strongly related to the dominance status of each tree. On average during the study period, the 87 Sr/ 86 Sr ratio of spruce wood decreased. Using a mechanistic model computing long term variations of 87 Sr/ 86 Sr ratio in trees and soils, we reproduced the observed trend by simulating soil acidification-increasing Sr drainage from the whole profile, and particularly from the organic horizon-, and root uptake becoming more superficial with time. Between 1952 and 1976, tree ring 13 C decreased strongly and continuously, which, in addition to other factors, might be related to an increase in water stress. Thus, a decrease in rooting depth, possibly related to soil acidification, appeared as a possible cause for the long term increase in water stress. The extreme drought event of 1976 appears to have revealed and triggered the decline.
Mostrar más [+] Menos [-]Accumulation and redistribution of trace metals in soils affected by diffuse atmospheric deposition | Accumulation et redistribution d'éléments traces métalliques dans des sols soumis à des retombées atmosphériques diffuses Texto completo
2001
Semlali, R. | van Oort, Folkert, F. | Denaix, Laurence | Loubet, M. | Unité d'agronomie ; Institut National de la Recherche Agronomique (INRA) | Unité de recherche Science du Sol (USS) ; Institut National de la Recherche Agronomique (INRA)
National audience
Mostrar más [+] Menos [-]The long-term of nitrate pollution in soils | Nitrate, un polluant de longue durée Texto completo
1998
Mariotti, André, A. | Biogéochimie et écologie des milieux continentaux (Bioemco) ; École normale supérieure - Paris (ENS-PSL) ; Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Université Pierre et Marie Curie - Paris 6 (UPMC)-AgroParisTech-Centre National de la Recherche Scientifique (CNRS)
National audience
Mostrar más [+] Menos [-]Non-local turbulent transport pollution dispersion aspects of coherent structure of convective flows Texto completo
1995
Zilitinkevich, S.
Ozone (tropospheric and stratospheric) and the health state of forest trees | L'ozone (troposphérique et stratosphérique) et la santé des arbres forestiers Texto completo
1994
Garrec, J.P. | Laboratoire d'étude de la pollution atmospherique ; Institut National de la Recherche Agronomique (INRA)
National audience
Mostrar más [+] Menos [-]Critical loads for vegetation. Definition, use and limits | Charges critiques pour la vegetation Texto completo
1993
Thimonier, A. | Dupouey, Jean-Luc | Unité d'écophysiologie forestière ; Institut National de la Recherche Agronomique (INRA)
11 ref.;Pollution de l'air et charges critiques | National audience
Mostrar más [+] Menos [-]Deperissement des forets et pollution atmospherique: ce que nous avons appris Texto completo
1992
Landmann, Guy | Unité de recherche Biogéochimie des Ecosystèmes Forestiers (BEF) ; Institut National de la Recherche Agronomique (INRA)
National audience
Mostrar más [+] Menos [-]