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| Registros recuperados: 80 | |
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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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| Phuapittayalert,Laorrat; Norkaew,Thongchai; Supanpaiboon,Wisa; Chuenchoojit,Supaporn; Hipkeao,Wiphawi; Swaddiwudhipong,Witaya; Sakulsak,Natthiya. |
| A toxic metal, cadmium (Cd), can accumulate in human organs. Placenta is usually used as indicator organ for Cd exposure. Therefore, we aim to investigate the different of placental morphology between the low- and high-Cd accumulated placentas. The samples were collected from 14 pregnant women who resided in low-Cd contaminated (L-Cd group) and high-Cd contaminated (H-Cd group) areas. The concentrations of Cd in blood (B-Cd), urine (U-Cd) and placentas (P-Cd) were measured by ICP-MS and AAS. The morphological appearance of placentas was examined by using routine paraffin section and H & E staining. The results showed that levels of B-Cd, U-Cd and P-Cd were significantly higher in H-Cd group than in L-Cd group (p= 0.001). Moreover, the B-Cd was... |
| Tipo: Journal article |
Palavras-chave: Cadmium; Placenta; Syncytial knot; Fibrinoid materials. |
| Ano: 2013 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000400011 |
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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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| Shweta,Mishra; Agrawal,S.B.. |
| The impact of supplemental UV-B (sUV-B) radiation and heavy metals: Cd (68 µmol.kg-1 soil) and Ni (68 µmol.kg-1 soil) singly and in combination was studied on photosynthetic and non-photosynthetic pigments, metabolites, enzyme activities, biomass accumulation and the net primary productivity of spinach (Spinacia oleracea L. var. All Green), a common leafy vegetable plant. Both the stresses individually and in combination resulted in the reduction of photosynthetic pigments, ascorbic acid, and catalase activity, whereas a reverse trend was observed for anthocyanin, flavonoids and proline content, lipid peroxidation and peroxidase activity. The interactive effects of both the stresses were, however, less than additive. Combined treatment of sUV-B + Cd was... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Spinaicia oleracea; Biomass; Cadmium; Enzymes; Nickel; Pigments; Ultraviolet-B. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202006000200007 |
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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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| We have previously demonstrated that acute third ventricle injections of both Pb2+ and Cd2+ impair the dipsogenic response elicited by three different situations: dehydration and central cholinergic or angiotensinergic stimulation. ß-Adrenergic activation is part of the multifactorial integrated systems operating in drinking behavior control in the central nervous system. In the present study acute third ventricle injections of Pb2+ (3, 30 and 300 pmol/rat) or Cd2+ (0.3, 3 and 30 pmol/rat) blocked the dipsogenic response induced by third ventricle injections of isoproterenol (ISO; 160 nmol/rat) in a dose-dependent manner. Normohydrated animals receiving ISO + NaAc (sodium acetate) or saline (controls) displayed a high water intake after 120 min (ISO +... |
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Palavras-chave: Lead; Cadmium; Water intake; Isoproterenol. |
| Ano: 1997 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1997000300018 |
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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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| Chouba, L.; Mzougui-Aguir, N.. |
| Dans l’objectif de déterminer l’état de la contamination organique et inorganique des sédiments superficiels de la frange côtière du golfe de Gabès, nous avons évalué les concentrations en hydrocarbures aromatiques totaux, en cadmium (Cd), en plomb (Pb) et en mercure (Hg). L’échantillonnage a été effectué à bord d’une barque motorisée, à l’aide d’une benne Van Veen au niveau de 25 stations. Les concentrations du Cadmium et du Plomb ont été déterminées par Spectrométrie d’Absorption Atomique à Four Graphite (Varian 220Z) alors que pour le Mercure les analyses ont été réalisées par Spectrométrie d’Absorption Atomique à vapeur froide. Les hydrocarbures totaux ont été analysés par UV-Fluorescence (UV-F). Les concentrations du Cadmium et du Mercure dans la... |
| Tipo: Journal Contribution |
Palavras-chave: Cadmium; Coastal waters; Hydrocarbons; Lead; Marine pollution; Mercury; Pollution monitoring; Sediments; Trace metals. |
| Ano: 2006 |
URL: http://hdl.handle.net/1834/4275 |
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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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| Sakulsak,Natthiya. |
| Metallothionein (MT) is a ubiquitous protein with a low molecular weight of 6-7 kDa weight and it was first identified in the kidney cortex of equines as a cadmium (Cd)-binding protein responsible for the natural accumulation of Cd in the tissue. The mammalian MT contains 61 to 68 amino acid residues, in which 18 to 23 cysteine residues are present. The expression of MT starts by binding of metal transcription factor-1 (MTF-1) to the regulative region of MT gene called metal responsive elements (MREs). The induction of MT through the MREs region can be initiated by several metal ions such as zinc (Zn), copper (Cu) and Cd. However, Zn is the only heavy metal which can reversibly and directly activate the DNA-binding activity of MTF-1. In mammals four types... |
| Tipo: Journal article |
Palavras-chave: Metallothionein; Cadmium; Zinc. |
| Ano: 2012 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000300039 |
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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, Virginie; Bustamante, Paco; Dabin, W; Van Canneyt, O; Dhermain, F; Cesarini, C; Pierce, G; Caurant, Florence. |
| This study aimed at comparing toxic element (Hg, Cd) bioaccumulation in relation to age for bottlenose (Tursiops truncatus) and striped dolphins (Stenella coeruleoalba) from Mediterranean and Atlantic waters. Metal concentrations were also measured in selected prey to infer metal exposure through the diet. As expected, Mediterranean prey exhibited the highest Hg levels, probably as a consequence of the Hg enrichment of the Mediterranean Sea. Comparing the predators from each area and taking age into account, Mediterranean bottlenose dolphins displayed higher Hg levels than Atlantic dolphins (p = 0.032), whereas Mediterranean striped dolphins did not (p = 0.691). The consumption of Myctophid fish, which showed the highest Hg levels (105 +/- 80 ng g(-1)... |
| Tipo: Text |
Palavras-chave: Exposure; Diet; Cadmium; Mercury; Tursiops truncatus; Stenella coeruleoalba. |
| Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/2006/publication-4713.pdf |
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| Registros recuperados: 80 | |
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