{"refrec":{"BRefID":206890,"RR":"<b>Bordin, G.; McCourt, J.; Rodriguez, A.</b> (1994). Trace metals in the marine bivalve Macoma balthica in the Westerschelde estuary, The Netherlands. Part 2: Intracellular partitioning of copper, cadmium, zinc and iron — variations of the cytoplasmic metal concentrations in natural and in in vitro contaminated clams. <i>Sci. Total Environ. 151(2)</i>: 113-124. <a href=\"http://dx.doi.org/10.1016/0048-9697(94)90168-6\" target=\"_blank\">dx.doi.org/10.1016/0048-9697(94)90168-6</a>","BEntID":198966,"PublicFlag":1,"CheckedFlag":1,"wosflag":1,"vabbflag":1,"RefStringPartII":". <i>Sci. Total Environ. 151(2)</i>: 113-124. <a href=\"https://dx.doi.org/10.1016/0048-9697(94)90168-6\" target=\"_blank\">https://dx.doi.org/10.1016/0048-9697(94)90168-6</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":1,"TerrestrialFlag":0,"Authorstring":"Bordin, G.; McCourt, J.; Rodriguez, A.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Bordin, G. <i>et al.</i>","Englishabstract":"The intracellular distribution of copper, cadmium, zinc and iron in the marine bivalve Macoma balthica has been studied for 18 months at two locations from the Westerschelde estuary. Metal concentrations in the soluble fraction (cytosol) and in the particulate phase of the soft tissues were measured by atomic absorption spectrometry. Considering all data, heat-stable cytosolic metal accounts for 10–33% of total Cu, ˜ 0–28% of total Cd, 7–17% of total Zn and 2–8% of total Fe. The case of non-essential cadmium is extremely interesting since the average difference in total concentration between the two stations (factor of 4) induces a much more marked average difference in cytosolic metal (factor of 15). Short term metal exposures carried out in the laboratory show a high sensitivity of this clam to Cd, a moderate sensitivity to Cu and no uptake of Zn. For the essential elements, the intracellular partitioning is not significantly affected. On the contrary, the extra load of cadmium provokes a large increase of the proportion of cytosolic metal, especially obvious when the natural cadmium concentration is low.","AbstractOtherLang":"La distribution intracellulaire du cuivre, du cadmium, du zinc et du fer chez le bivalve marin Macoma balthica, provenant de deux sites de l'estuaire de l'Escaut, a été étudiée tous les deux mois pendant une année et demie. Les concentrations métalliques ont été mesurées par spectrométrie d'absorption atomique dans la fraction soluble (cytosol) et dans la phase particulaire, extraites de l'homogénéisation des tissus. En prenant en compte l'ensemble des données, on observe que le métal cytosolique après traitment thermique, représente 10–33% du cuivre total, ˜ 0–28% du cadmium total, 7–17% du zinc total et 2–8% du fer total. Le cadmium, élément non-essentiel, constitue un cas extrêmement intéressant, puisque la différence moyenne des concentrations totales entres les deux stations (facteur 4) induit une différence moyenne plus grande encore des teneurs dans le cytosol (facteur 15). Les expériences d'exposition à des contaminations métalliques de courte durée menées au laboratoire montrent une assimilation très élevée de cadmium, modérée de cuivre et nulle en zinc. Ceci ne se traduit pas par une variation notable de la distribution intracellulaire des éléments essentiels. Par contre, l'accumulation de cadmium provoque une augmentation importante des proportions de ce métal dans le cytosol, particulièrement marquée quand la teneur naturelle en cadmium est faible.","BibLvlCode":"AS","StandardTitle":"Trace metals in the marine bivalve Macoma balthica in the Westerschelde estuary, The Netherlands. 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