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| Registros recuperados: 12 | |
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| Droguet, Mickael; Devauchelle, Nicole; Pennec, Jean-pierre; Quinn, Brian; Dorange, Germaine. |
| European Community regulations on chemicals promote alternative methods to test substances presenting potential risks for the environment. In the present work, cultured atrial cells isolated from oyster (Crassostrea gigas) were used as an experimental model to investigate the toxicity of tributyltin (TBT) after short-time exposure at concentrations representative of those that can be measured in seawater, marine sediments and/or bivalves bioaccumulating this pollutant. In vitro and in vivo assays produce values of the same order of magnitude for both animal/cell survival and heart/cardiomyocyte beating rate. The survival rate of whole animals decreased from 10(-6) M TBT after 3 days. For cultured cells, the viability, evaluated using 3-(4,... |
| Tipo: Text |
Palavras-chave: Oyster; Heart cells; Flow cytometry; Tributyltin; Toxicity; Antifouling. |
| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00089/20032/17688.pdf |
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| Paulet, Yves-marie; Bekhadra, Farida; Devauchelle, Nicole; Donval, Anne; Dorange, Germaine. |
| This work is part of the program, "recruitment determinism in scallops" initiated in 1992 by the "Contrat de Baie". The aim of this research was to explain interannual abundance fluctuations observed for Pecten maximus, in the Bay of Brest. To this end an analytical approach to the life cycle of the species was undertaken to determine its critical phases. A phase may be considered as "critical" if the mortality rate at its level varies from one year to the other. Using data from 1989 to 1994, a precise time-table of the "physiological year" of the scallop in the Bay of Brest was determined. Fecundity and gamete production kinetics were estimated from the annual variation in the weight indices of the gonad. In the laboratory, egg quality was estimated... |
| Tipo: Text |
Palavras-chave: Pecten maximus; Recruitment; Reproductive cycle; Digestion. |
| Ano: 1995 |
URL: http://archimer.ifremer.fr/doc/00044/15495/12861.pdf |
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| Renault, Tristan; Davison, Andrew; Xhonneux, Florence; Dorange, Germaine; Culloty, Sarah; Novoa, Beatriz; Dixon, Peter. |
| Little information is available on viral infections that affect bivalve molluscs. Such a lack of data is due ta a certain inadequacy of the diagnosis methods that are employed when massive mortality events occur. Most laboratories involved in mollusc pathology still analyse samples through light microscopy. World-wide, there is thus currently a lack of information concerning the occurrence of bivalve herpesvituses. This is probably due to the lack of suitable diagnostic tools. The basic method for identification and examination of suspect samples is predominantly histopathology. This enables the identification of any cellular changes, but is not conclusive identification of bivalve herpesviruses. This technique doesn't allow, by itself, to detect viruses... |
| Tipo: Text |
Palavras-chave: Pathology; Virology; Diagnosis; Herpes like virus; Validation molecular; Detection; Herpesviridae; OsHV-1; Diagnostic techniques; Oysters. |
| Ano: 2002 |
URL: http://archimer.ifremer.fr/doc/00044/15525/12912.pdf |
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| Larvor-cario, Hélène; Philip De Laborie, Loic; Hureau, Dorothee; Muzellee, Marie-louise; Dorange, Germaine; Durand, Gaël; Devauchelle, Nicole. |
| La coquille Saint-Jacques est un bivalve largement exploité sur les côtes françaises. En Rade de Brest, cette espèce présente un intérêt commercial tout particulier du fait de présenter une noix (muscle adducteur) et un corail (organe reproducteur) bien développés toute l'année. Elle fait l'objet d'une pêcherie spécifique et très contrôlée. Durant la phase préparatoire du contrat de Baie de la Rade de Brest, des travaux financés par le programme Rade ont été menés à l'écloserie du Tinduff dans le but d'améliorer le soutien au stock naturel exploité par cette pêcherie. Malgré de nettes avancées dans la production de cette éc1oserie, des mortalités de larves constatées dans les élevages restent inexpliquées. D'autre part, des études menées par l'UBO et... |
| Tipo: Text |
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| Ano: 2000 |
URL: http://archimer.ifremer.fr/doc/00043/15463/12838.pdf |
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| Dorange, Germaine. |
| L'environnement gonadique des cellules sexuelles, le déroulement de la gamétogenèse, le devenir des gamètes formés et leur qualité au moment de l'émission ont été étudiés chez Pecten maximus sur le plan ultrastructural et histochimique. Les résultats obtenus sur la gamétogenèse se sont révélés, dans l'ensemble, conformes à ceux de travaux antérieurs sur les bivalves et en outre ils ont permis: - de mettre en évidence des cellules actif dans les processus de maturation femelle; somatiques auxiliaires et leur rôle des lignées germinales mâle et - de noter l'apparition précoce, au cours de la vitellogenèse, d'inclusions de type lysosomal - d'identifier les granules corticaux et de mettre en évidence leur rôle dans la constitution d'une membrane de... |
| Tipo: Text |
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| Ano: 1989 |
URL: http://archimer.ifremer.fr/doc/00033/14471/11768.pdf |
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| Suquet, Marc; Billard, Roland; Cosson, Jacky; Dorange, Germaine; Chauvaud, Laurent; Mugnier, Chantal; Fauvel, Christian. |
| This paper presents some features of turbot sperm and compares them with data reported in the literature on other freshwater and marine fish. In captivity, turbot spermiation period lasts 6 months. When compared to other fish species, turbot males are characterized by low values of maximum gonadosomatic index (0.6-0.8%) and are poor sperm producers in terms of volume (0.2-2.2 ml), concentration (0.7-11.0 x 10(9) spermatozoa/ml) and total sperm number released per stripping (0.2-12.0 x 10(9) spermatozoa). Compared to most freshwater species, the duration of cell movement is long (1-17 min). The spermatozoon of turbot can be considered to be of a primitive type. A very high protein content (8.8 mg/ml) is found in the seminal fluid of turbot. Increasing... |
| Tipo: Text |
Palavras-chave: Scophthalmus maximus; Turbot; Biologie du sperme; Liquide séminal; Mobilité du spermatozoïde; Morphologie du spermatozoïde; Poisson marin; Scophthalmus maximus; Turbot; Sperm biology; Seminal fluid; Sperm motility; Sperm morphology; Marine fish. |
| Ano: 1994 |
URL: http://archimer.ifremer.fr/doc/00188/29893/28334.pdf |
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| Registros recuperados: 12 | |
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