Consulta: subjectFacets:"Biomarqueur"
Registros recuperados: 7
Data/hora: 04/06/2024 17:51:10

Utilisation des métallothionéines comme biomarqueur de la contamination métallique : variabilité entre sites et organes chez l'huı̂tre Crassostrea gigas
Provedor de dados: 5
Autores: 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

L'acétylcholinestérase, marqueur de neurotoxicité. Application à la surveillance des effets biologiques des polluants chez les organismes marins
Provedor de dados: 5
Autores: Bocquene, Gilles.
Les cholinestérases et particulièrement l'acétylcholinestérase (AChE) constituent la cible privilégiée de nombreuses molécules neurotoxiques notamment des insecticides organophosphorés (OP) et carbamates. La sensibilité des cholinestérases à ces inhibiteurs est aussi complexe que le polymorphisme de ces enzymes. L'utilisation des niveaux d'activité des cholinestérases comme marqueur d'exposition aux neurotoxiques dans le milieu marin implique donc une connaissance approfondie du polymorphisme de i'enzyme, de Ja sensibilité des formes AChE identifiées et des contaminants neurotoxiques susceptibles de provoquer des variations dans l'activité de cette enzyme chez les organismes marins. Aprés une synthèse des connaissances sur le polymorphisme des...
Tipo: Text
Palavras-chave: Biomarqueur; Cholinestérases; Pollution marine; Huître; Organophosphorés; Carbamates.
Ano: 1996
URL: http://archimer.ifremer.fr/doc/00443/55435/56950.pdf

Traitement par lagunage a haut rendement algal (LHRA) des effluents piscicoles marins recycles: évaluation chimique et écotoxicologique
Provedor de dados: 5
Autores: Deviller, Genevieve.
World aquaculture is a fast growing activity and the control of its waste becomes a key issue. Compared to traditional systems, recirculating systems allow to reduce replacement water and waste volumes. Nevertheless their effluents are more concentrated in dissolved nutrients (nitrate, phosphate). The high rate algae pond (HRAP) is one of the possible treatment technique to remove those nutrients. During this work, three rearing systems: one recycled, one recycled with HRAP and one open as a standard, were operated for one year to assess the impact of: (1) the reuse of treated effluent on survival, growth and nutrition of sea bass (2) the rearing system on fish health using multibiomarkers and trace metals accumulation responses and (3) best conditions for...
Tipo: Text
Palavras-chave: Aquaculture; Fish; Growth; Metals; Biomarker; Water treatment; Recirculating effluent; High rate algal pond; Aquaculture; Poisson; Croissance; Métaux; Biomarqueur; Epuration; Effluent recyclé; Lagunage à haut rendement algal.
Ano: 2003
URL: http://archimer.ifremer.fr/doc/2004/these-163.pdf

Evaluation of the impacts of land-based contaminants on the benthic faunas of Jakarta Bay, Indonesia
Provedor de dados: 5
Autores: Rees, Jg; Setiapermana, D; Sharp, Va; Weeks, Jm; Williams, Tm.
To evaluate the impact of land-based contaminants on benthic faunas, as part of the Land-Ocean Contamination Study (LOCS), a study transect was established in Jakarta Bay, Indonesia during the 1996 southeasterly monsoon. The transect extended 72 km between the city's main port, Tanjung Priok, and the Pilau Seribu Island chain in the Java Sea. The dissolved concentrations of Pb, Cu, Zn, Cr and Ni in seawater, in suspended particulate matter (SPM) and surficial sea bed sediments were measured along the transect at nine sites. In addition, metal concentrations were measured in tissues of the corals Goniopora lobata and Lobophyllia hemprichii at five sites, and of the green mussel, Perna viridis at six sites. An assessment of the impact of contaminants on the...
Tipo: Text
Palavras-chave: Djakarta; Contamination; Biomarqueur; Communauté corallienne; Jakarta; Contamination; Biomarker; Coral-community.
Ano: 1999
URL: http://archimer.ifremer.fr/doc/00325/43588/44028.pdf

Nouvelle stratégie de caractérisation non ciblée de type métabolomique au service de l’identification de composés bioactifs accumulés dans les mollusques bivalves
Provedor de dados: 5
Autores: Mondeguer, Florence; Antignac, Jean-philippe; Guitton, Yann; Monteau, Fabrice; Le Borgne, Sabrina; Hess, Philipp.
The bioactivity of phytoplankton toxins that accumulate in shellfish is almost always tested on animal model (mice assay). In spite of these advantages, the ability of this test to explain the nature of the bioactivity remains limited. Besides, the current sanitary control based on targeted methods of identification and quantification (LC-MS/MS) of known toxins, do not permit to detect unknown toxins. In order to cope with this need of identification of unknown toxic substances, a next approach based on global and differential metabolomic profiling was proposed. The first results obtained from extracts that have shown a positive toxicity in mice without the substances potentially responsible for these toxic effects have been measured by targeted methods,...
Tipo: Text
Palavras-chave: Métabolomique; LC-HRMS; Biotoxines marines; Biomarqueur.
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00077/18784/16352.pdf

Etude du comportement à court terme de produits chimiques flottants après leur déversement en mer et recherche d'un indicateur d'exposition biologique
Provedor de dados: 5
Autores: Mamaca, Emina.
Large volumes of chemicals are produced each year. Shipment of these chemicals by boats and barge transiting along coastal marine route are numerous. Recent examples of chemical spills as Eiwa Maru (2002) sinking with 5000 T of xylène from 20 nm of Tokyo and less far from our coastline the Ievoli Sun (2000) which sank and release 1000 T of styren has raised concern about the general lack of information of the fate of chemicals at sea and the impact on fauna and flora.  The goal of this study is to characterize the behaviour of some selected chemicals at sea in order to evaluate the cinetic of natural dispersion, emulsification and evaporation. This study is done in three scale : in laboratory with a new methodologie created for this purpose, in a pilot...
Tipo: Text
Palavras-chave: NRRT; Biomarker; Field trial; Emulsification; Natural dispersion; Vegetable oil; Chemicals; NRRT; Biomarqueur; Experimentation en mer; Émulsification; Dispersion naturelle; Huiles végétales; Produits chimiques.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/these-2460.pdf

Suivi annuel de l'activité catalase chez des moules et des palourdes originaires de la lagune de Bizerte
Provedor de dados: 5
Autores: Dellali, M; Romeo, M; Aissa, P.
The variations of catalase activity, which is a biochemical biomarker of exposure to an oxidative stress, were followed month by month (from May 1998 to May 1999) in Mediterranean clams (Ruditapes decussatus) collected at three stations (J, A and F), and mussels (Mytilus galloprovincialis) collected at two stations (J and C) in Lake Bizerte (Tunisia). Several oceanographic parameters were measured together with catalase activity in the animals to evaluate the quality of waters in the lake. Whatever the station taken into consideration, catalase activity in clams significantly varied as a function of the season, with marked increases in September, when the quality of waters was poor. Clams originating from station A presented the highest mean activity...
Tipo: Text
Palavras-chave: Biomarqueur; Catalase; Lagune de Bizerte; Moule; Palourde; Biomarker; Catalase; Lake Bizerte; Mussel; Clam.
Ano: 2001
URL: http://archimer.ifremer.fr/doc/00322/43354/42859.pdf