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Zinc incorporation into the frustule (siliceous cell wall) of the freshwater diatom Stephanodiscus hantzschii was studied for Zn 2+ concentrations ranging from 25 pmol L −1 to 25 nmol L −1 . A sigmoidal dependency was observed between Zn 2+ concentrations in the culture medium and the concentration of Zn in the frustule. Concentrations of intracellular Zn were positively...
Historical changes in bioavailable Zn concentrations of the surface waters of Lake Geneva were assessed by analyzing the zinc content of fossil diatoms. The measured ratios of Zn to Si in the opal ((Zn/Si) opal ) were consistent with both data obtained for cultured freshwater diatoms that were representative of lake Geneva and with field data. Reconstructed variations suggested that increased...
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