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Posted Tue Mar 2 2010: from Purdue, via EurekAlert:
Popular nanoparticle causes toxicity in fish, study shows
... [N]anosilver suspended in solution proved toxic and even lethal to the minnows. When the nanosilver was allowed to settle, the solution became several times less toxic but still caused malformations in the minnows. "Silver nitrate is a lot more toxic than nanosilver, but when nanosilver was sonicated, or suspended, its toxicity increased tenfold," said Maria Sepulveda, an assistant professor of forestry and natural resources whose findings were published in the journal Ecotoxicology. "There is reason to be concerned."... "These nanosilver particles are so small they are able to cross the egg membranes and move into the fish embryos in less than a day," Sepulveda said. "They had a potentially high dose of silver in them."
[Read more stories about: toxic water, unintended consequences, nanotechnology]

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'Doc Jim says:
Only a really tiny reason to be concerned!

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