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| Registros recuperados: 51 | |
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| MELO, I. S. de; SILVA, C. M. M. de S.; FAY, E. F.; MONTEIRO, R. R.; ROSAMIGLIA, A. C.. |
| Atrazina é um dos herbicidas mais utilizados no mundo, apresentando relativa persistência em zonas saturadas e insaturadas. A principal via de dissipação de atrazina inclui a biodegradação. Solos coletados no município de Guaíra, SP, provenientes de áreas de mata, e solos sob cultivo intensivo, sob irrigação, com histórico de aplicação de atrazina, foram suplementados e incubados com o herbicida nas seguintes concentrações:70 microgramas g-1, 350 microgramas g-1 700 microgramas g-1. Após diluição em série, procedeu-se ao plaqueamento em meio de cultura (meio de Martin), também suplementado com o herbicida (700~g g ' l). Os fungos selecionados nesta fase foram cultivados em meio líquido de batata- dextrose (50%) suplementado com 700 microgramas mL-1 de... |
| Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E) |
Palavras-chave: Herbicida; Microrganismo; Atrazina; Biodegradação; Penicillium; Atrazine; Herbicides; Biodegradation. |
| Ano: 1999 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1026398 |
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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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| Bouilly, Karine; Leitao, Alexandra; Mccombie, Helen; Chaves, R.; Guedes Pinto, H; Boudry, Pierre; Lapegue, Sylvie. |
| In the Pacific oyster, Crassostrea gigas hypodiploid aneuploid cells with 2n=19, 18 or 17 chromosomes have regularly been reported. There is a negative correlation between somatic aneuploidy and growth rate in oysters (Leitão et al., 2001a) as well as evidence for a genetic basis (Leitão et al., 2001b). Furthermore, non-random chromosome loss has been demonstrated in aneuploid karyotypes of C. gigas using the G-banding technique (Leitão et al., 2001c). This poster summarises different studies used to investigate the effects of the herbicide atrazine on the level of aneuploidy in this species |
| Tipo: Text |
Palavras-chave: Genetic; Aneuploidy; Toxicology; Impact; Atrazine; Crassostrea gigas; Pacific oysters. |
| Ano: 2004 |
URL: http://archimer.ifremer.fr/doc/2004/acte-3489.pdf |
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| Bouilly, Karine; Leitao, Alexandra; Chaves, Raquel; Guedes Pinto, Henrique; Boudry, Pierre; Lapegue, Sylvie. |
| Aneuploidy has previously been observed in the Pacific oyster, Crassostrea gigas, and shown to be negatively correlated with growth. Moreover, a significant impact of atrazine exposure has been described in C. gigas, and persistence of that effect has been observed between generations. Evidence of differential chromosome loss has been demonstrated in aneuploid karyotypes of C. gigas using the G-banding technique. Pairs 1, 5, 9, and 10 are characterized by the loss of 1 chromosome. As restriction enzyme (RE) digestion chromosome banding allows a better identification of chromosome pairs, we used this technique to identify which chromosomes are affected when aneuploidy is increased by exposure to atrazine. The progeny of oysters contaminated by atrazine were... |
| Tipo: Text |
Palavras-chave: Crassostrea gigas; Pacific oyster; Restriction enzyme digestion chromosome banding; Atrazine; Aneuploidy; Crassostrea gigas; Huître creuse; Marquage chromosomique par digestion d'enzymes de restriction; Atrazine; Aneuploïdie. |
| Ano: 2005 |
URL: https://archimer.ifremer.fr/doc/2005/publication-654.pdf |
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| Guerit, Isabelle; Bocquene, Gilles; James, Alice; Thybaud, E; Minier, C. |
| The aim of this study was to test field relevance of the prospective methodology for the assessment of environmental risk described in the EU technical guidance document (TGD) [European Commission 2003. Technical guidance document in support of Commission Directive 93/67/EEC on Risk assessment for new notified substances and Commission Regulation (EC) No 1488/94 on Risk assessment for existing substances and Commission Directive (EC) 98/8 on biocides, second ed. European Commission, Luxembourg, Part 1, 2 and 3, 760pp.]. To achieve this goal, an environmental risk assessment was performed according to the TGD for two major contaminants, atrazine and diuron, that are present in the Seine River estuary (France) and listed in the EU Water Framework Directive... |
| Tipo: Text |
Palavras-chave: Diuron; Atrazine; Estuaries; The Seine River; Technical guidance document; Chemical risk assessment. |
| Ano: 2008 |
URL: http://archimer.ifremer.fr/doc/2008/publication-4540.pdf |
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| Bouilly, Karine; Leitao, Alexandra; Mccombie, Helen; Miramand, Pierre; Lapegue, Sylvie. |
| Aneuploidy is the alteration of the normal diploid chromosome number. In the Pacifie oyster, Crassastrea gigas, hypodiploid cells have regularly been reported as have a negative correlation between this phenomenon and growth and evidence for a genetic basis. We previously demonstrated a positive relationship between a pollutant, atrazine, and aneuploidy in Crassastrea gigas adults and juveniles. To evaluate the persistence of this impact, the present study focused on a sample of the same juveniles previously exposed to different atrazine treatments (0.0 1 mg/l which represents a peak value found in a polluted environment and 0.1 mg/l) for three and a half months. Then, we evaluated them for aneuploidy after another two and a half months in non polluted... |
| Tipo: Text |
Palavras-chave: Cadmium; Atrazine; Pollutant; Pacific oyster; Aneuploidy. |
| Ano: 2003 |
URL: http://archimer.ifremer.fr/doc/2003/acte-2852.pdf |
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| Lapegue, Sylvie; Mccombie, Helen; Leitao, Alexandra; Bouilly, Karine; Sabatier, Sebastien; Heurtebise, Serge; Boudry, Pierre; Thiriot, Catherine; Gerard, Andre. |
| Divers travaux menés depuis 1984 montrent qu'il existe, chez l'huître creuse Crassostrea gigas, des cellules montrant un nombre anormal de chromosomes (2n = 19, 18 ou même 17 au lieu de 2n = 20). Le niveau d'aneuploïdie est déterminé par le décompte des chromosomes à partir de suspensions cellulaires de tissu branchial. Le pourcentage de cellules aneuploïdes est toujours significativement supérieur dans les "lots de queue", c'est-à-dire les huîtres présentant des croissances plus faibles, et peut atteindre plus de 30 %. Récemment, une étude réalisée au sein du programme européen « Genephys » a démontré que plus de 50 % de la variance pour la vitesse de croissance était liée au taux d'aneuploïdie. Cependant, de nombreux points concernant ce phénomène... |
| Tipo: Text |
Palavras-chave: Génétique; Chromosomes; Anomalies; Aneuploïdie; Atrazine; Huîtres creuses; Crassostrea gigas. |
| Ano: 2002 |
URL: http://archimer.ifremer.fr/doc/00199/31013/29417.pdf |
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| Sabatier, Sebastien. |
| Le bassin de Marennes-Oléron, milieu fortement anthropisé, souffre d'une diminution générale du taux de croissance des huîtres creuses, Crassostrea gigas. Si les fortes densités existants dans le bassin sont grandement responsables de ce phénomène, d'autres facteurs environnementaux peuvent intervenir. Nous nous sommes intéressés à un caractère corrélé négativement à la croissance, le taux d'aneuploïdie. Il s'agit d'un phénomène cytogénétique ayant pour conséquence la perte ou le gain de chromosomes. Dans cette étude, une expérimentation en écloserie a été mise en place afin de tester l'effet de l'atrazine (herbicide très utilisé et se retrouvant en quantité importante dans le bassin) sur le taux d'aneuploïdie de naissains d'huîtres. Les valeurs testées... |
| Tipo: Text |
Palavras-chave: Crassostrea gigas; Naissain; Aneuploïdie; Environnement; Atrazine; Anthropisation. |
| Ano: 2001 |
URL: http://archimer.ifremer.fr/doc/00033/14408/11701.pdf |
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| Gagnaire, Beatrice. |
| La conchyliculture et notamment l'ostréiculture se sont beaucoup développées en France dans les dernières décennies. Le bassin de Marennes-Oléron (Charente-Maritime) est le premier bassin français producteur d'huîtres. Mais cette zone est également soumise à de nombreuses pollution récurrentes, apportées principalement par la Charente. La recrudescence de l'utilisation d'herbicides en agriculture tels que l'atrazine implique le transfert vers le milieu aquatique de nouveaux polluants dans les zones d'estuaires. De plus, les rejets industriels apportent de nombreux métaux lourds dans ces mêmes zones d'estuaire. Il convient de s'interroger sur les effets néfastes de tous ces polluants sur les animaux vivant dans ces zones, tout particulièrement les huîtres,... |
| Tipo: Text |
Palavras-chave: Crassostrea gigas; Hémocytes; Cytométrie de flux; Métaux lourds; Atrazine; Phénoloxydase. |
| Ano: 2001 |
URL: http://archimer.ifremer.fr/doc/00032/14337/11620.pdf |
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| Bouilly, Karine; Mccombie, Helen; Leitao, Alexandra; Lapegue, Sylvie. |
| Widespread use of the herbicide atrazine has incited much research on its toxicity in aquatic systems, where it is routinely detected due to runoff from cultivated fields. Moreover, the determination of the genotoxic effect of such pollutants in the marine environment has become a major requirement for ecosystem protection. In the Pacific oyster, Crassostrea gigas, hypodiploid aneuploid cells have regularly been reported. There is a negative correlation between this phenomenon and growth, as well as evidence for a genetic basis. A positive relationship between atrazine and aneuploidy has previously been demonstrated in C. gigas adults and juveniles. To evaluate the persistence of this impact, our study examined the offspring of the same adult population... |
| Tipo: Text |
Palavras-chave: Aneuploidy; Crassostrea gigas; Atrazine; Toxicity; Pollutant persistence. |
| Ano: 2004 |
URL: http://archimer.ifremer.fr/doc/2004/publication-580.pdf |
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| Registros recuperados: 51 | |
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