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| Registros recuperados: 80 | |
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| Chakravorty, R.; Van Grieken, R.. |
| The coprecipitation of Cd, Co and Eu from seawater onto ferric hydroxide was studied, using the radioactive tracers <sup>109</sup>Cd, <sup>60</sup>Co and <sup>152-154</sup>Eu, as a function of the pH, the concentration of the collector iron, the concentration of the metal spike and the aging of the internally formed precipitate. For preconcentration purpose, a pH 9 and a 35 ppm iron concentration appeared to be suitable. At pH 8, the natural pH of seawater, the distribution coefficients for Cd, Co and Eu are 10<sup>4.5</sup>, 10<sup>5</sup> and 10<sup>7</sup>, respectively. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cadmium; Coprecipitation; Radiochemistry; Sea water. |
| Ano: 1986 |
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3236 |
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| Delcroix, Valérie. |
| Le cadmium, sous produit du zinc est utilisé en industrie. La quasi totalité du cadmium utilisé a été disséminée dans l'environnement. Le cadmium provoque chez l'homme des intoxications par inhalation et par ingestion par l'intermédiaire d'aliments contaminés. Les organismes marins comme l'huître concentrent le cadmium et le stockent sous des formes biodisponibles par les mammifères qui les consomment. Face à ce problème important nous avons mené une enquète avec l'aide de l' IFREMER et de la DDASS sur les effets possibles de l'accumulation de cadmium par les consommateurs d'huitres. Une étude de décontamination a été entreprise sur ces huîtres, une fois placées en eau exempte de pollution |
| Tipo: Text |
Palavras-chave: Cadmium; Huître Gigas; Estuaire Gironde; Epdémiologie cadmium; Décontamination. |
| Ano: 1991 |
URL: http://archimer.ifremer.fr/doc/00442/55394/56914.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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| De-Castro-e-Silva,E.; Luz,C.P.; Sarmento,C.; Nascimento,T.; Gonzalez,V.; Marinho,C.A.; Castro,L.; Oliveira,P.; Santana Jr.,P.; De-Oliveira,I.R.; De-Paula,S.; Lima,A.K.S.; Fregoneze,J.B.. |
| We have previously demonstrated that acute third ventricle injections of both lead and cadmium prevent the dipsogenic response elicited by dehydration or by central injections of dipsogenic agents such as angiotensin II, carbachol and isoproterenol in rats. We have also shown that the antidipsogenic action of cadmium may be due, at least in part, to activation of thirst-inhibitory central serotonergic pathways. In the present paper we show that in Wistar male rats the antidipsogenic effect of both lead acetate (3.0 nmol/rat) and cadmium chloride (3.0 nmol/rat) may be partially dependent on the activation of brain opiatergic pathways since central injections of naloxone (82.5 nmol/rat), a non-selective opioid antagonist, blunt the thirst-inhibiting effect... |
| Tipo: Info:eu-repo/semantics/other |
Palavras-chave: Cadmium; Lead; Water intake; Opioids; Rats. |
| Ano: 1998 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1998000600013 |
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| Gonzalez, Jean-louis; Dange, Catherine; Thouvenin, Benedicte. |
| In estuarine environment, cadmium has a nonconservative behavior. It can be present under various species: dissolved (mineral and organic complexes), colloidal and particulate forms (adsorbed, precipitated), or integrated by various mechanisms in the organisms. This distribution is the result of processes (physical, chemical and biological) which are controlled by many factors (salinity, pH, Eh, nature and concentration of suspended matter, primary production). Geochemical modeling is a very useful approach to understand the dynamics of this type of contaminant, especially in the complex systems which are the estuaries. A speciation model was used to simulate the measurements taken (dissolved and particulate Cd) during various cruises carried out in the... |
| Tipo: Text |
Palavras-chave: Cadmium; Estuary; Speciation; Modeling; Surface complexation; Cadmium; Estuaire; Spéciation; Modélisation; Complexation de surface. |
| Ano: 2001 |
URL: https://archimer.ifremer.fr/doc/00480/59120/61749.pdf |
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| Rodríguez,E.M.; Bigi,R.; Medesani,D.A.; Stella,V.S.; Greco,L.S.L.; Moreno,P.A.R.; Monserrat,J.M.; Pellerano,G.N.; Ansaldo,M.. |
| Whole body oxygen consumption and some hemolymph parameters such as pH, partial pressure of gases, level of ions and lactate were measured in the estuarine crab Chasmagnathus granulata after both acute (96 h) and chronic (2 weeks) exposure to cadmium at concentrations ranging from 0.4 to 6.3 mg/l. In all instances, the crabs developed hemolymph acidosis, but no respiratory (increased PCO2) or lactate increases were evident. Hemolymph levels of sodium and calcium were always increased by cadmium exposure. The chronic toxicity of cadmium was enhanced at 12 salinity, even causing a significantly higher mortality in comparison with the higher salinity (30) used. A general metabolic arrest took place at 12 salinity in the crabs chronically exposed to... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cadmium; Crabs; Blood homeostasis; Salinity. |
| Ano: 2001 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2001000400011 |
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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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| Dange, Catherine. |
| Most of trace elements have a non conservative behavior in estuarine environments. It is the case of cadmium, cobalt and caesium for which the fate in estuarine and coastal zones is largely controlled by their distribution between water and suspended particles, which generally have high residence times or can be definitely deposited in these areas. Metallic contaminants and radionuclides can be present under various species : dissolved (mineral and organic complexes), colloidal and particulate forms (adsorbed, precipitated) or integrated by various mechanisms in the organisms. Such distributions are the result of processes (physical, chemical, biological) which are controlled by many factors (ionic strengh, pH, Eh, major cations concentration, nature and... |
| Tipo: Text |
Palavras-chave: Modeling; French estuaries; Caesium; Cobalt; Cadmium; Radionuclides; Trace metals; Speciation; Modélisation; Estuaires français; Cesium; Cobalt; Cadmium; Radionucléides; Métal trace; Speciation. |
| Ano: 2002 |
URL: http://archimer.ifremer.fr/doc/2002/these-183.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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| Adamis,Paula D.B.; Panek,Anita D.; Leite,Selma G.F.; Eleutherio,Elis C.A.. |
| At the concentration used in this work (10 ppm), cadmium was efficiently removed from the environment by stationary yeast cells. While exponential phase cells showed low capacity of cadmium absorption, stationary cells removed 97% of the original metal in 24 hours. Total cadmium absorption shown by dry cells was lower than that of fresh ones, although both cells removed 50% of metal during the first hour of treatment. We also verified that only viable cells were capable of absorbing cadmium. Independently of the growth phase, cells showed high tolerance to 10 ppm CdSO4 and about 80% of cells remained viable after 24 hours exposure to cadmium. However, when stationary phase cells were previously dehydrated and then exposed to cadmium, they exhibited poor... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Saccharomyces cerevisiae; Cadmium; Absorption; Intracellular oxidation. |
| Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822003000100012 |
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| Ribas,Paulo; Lopes,Ruberval A.; Sala,Miguel A.; Ribas,Lucia M.R.; de Mattos,Maria da Glória C.; Semprini,Marisa; Watanabe,Ii-Sei; Regalo,Simone C.H.. |
| Cadmium in the air, drinking water and food has the potential to affect the health of people, mainly those who live in highly industrialized regions. Cadmium affects placental functions, can cross the placental barrier and directly disturbs fetal development. It is also excreted into milk. The organism is particularly susceptible to cadmium exposure at perinatal period. The effect on rat maxillary molar junctional epithelium a continuous exposure to drinking water containing low level of cadmium during lactation was studied. Female rats received drinking water ad libitum containing 300 mg/l CdCl2 throughout the whole lactation. Control animals received a similar volume of water without cadmium. Lactent rats (21 day-old) were killed by lethal dose of... |
| Tipo: Journal article |
Palavras-chave: Oral mucosae; Junctional epithelium; Cadmium; Lactation; Morphometry; Stereology. |
| Ano: 2004 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022004000400003 |
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| Registros recuperados: 80 | |
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