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Pandora’s Boxes by Heather Millar

In biology, chemistry, ecology, environment, nature, physics, science on April 3, 2014 at 23:49

From: Pandora’s Boxes by Heather Millar, Orion Magazine, http://www.orionmagazine.org

Wiesner and his colleagues spent several months designing the experiments that will help them outline some general ecological principles of the unique nanoverse. He knew they wanted to test the particles in a system, but a full-scale ecosystem would be too big, too unmanageable, so they had to find a way to container-ize nature. They considered all sorts of receptacles: kiddie pools (too flimsy), simple holes in the ground (too dirty, too difficult to harvest for analysis), concrete boxes (crack in winter). Finally, they settled upon wooden boxes lined with nonreactive, industrial rubber: cheap to build, easy to reuse, and convenient to harvest.

Some published research has shown that inhaled nanoparticles actually become more toxic as they get smaller. Nano–titanium dioxide, one of the most commonly used nanoparticles (Pop-Tarts, sunblock), has been shown to damage DNA in animals and prematurely corrode metals. Carbon nanotubes seem to penetrate lungs even more deeply than asbestos.

What little we know about the environmental effects of nanoparticles—and it isn’t very much—also raises some red flags. Nanoparticles from consumer products have been found in sewage wastewater, where they can inhibit bacteria that help break down the waste. They’ve been found to accumulate in plants and stunt their growth. Another study has shown that gold nanoparticles become more concentrated as they move up the food chain from plants to herbivores.

Read the article

Reposted with permission from: Orion Magazine

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