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In this paper we have studied changes of Si concentration (free and bound form) in Equisetum arvense L. and Pastinaca sativa L. Its aim was the attempt to answer the question if the UV radiation (366 nm), infestation by Aphis sp. and heavy metals ions influence the Si concentration of medicinal plants. We showed here that Equisetum shoots contained silica on the surface of the plant. In the interior,...
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