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4/1/2011 1:40:35 PM
Nanoparticles Shorten Roundworms' Lives

Even though nanoparticles are increasingly entering the environment, scientists still have a lot to learn about their biological effects. Now Chinese researchers have found that exposure to cerium dioxide nanoparticles shortens the lifespan of the roundworm Caenorhabditis elegans (Environ. Sci. Technol., DOI: 10.1021/es103309n).

Zhiyong Zhang and colleagues from the Chinese Academy of Sciences' Institute of High Energy Physics exposed larvae of the widely used model organism C. elegans to 8.5-nanometer particles of CeO2. Nanoparticles of CeO2 have many high-tech uses, such as in catalytic converters and as polish for silicon wafers. They are also under consideration for use in eye drops and sunscreen.

Research on other nanoparticles has suggested that they can trigger oxidative stress in C. elegans. But studies on CeO2 nanoparticles have hinted that they may actually protect against cardiovascular, neurological, and radiological damage in rats, mice, and human cells in vitro, respectively. However, those studies used high concentrations of the nanoparticles. Zhang wanted to see how environmentally relevant concentrations of CeO2 nanoparticles might affect an organism's health.

Nematodes may die early after eating nanoparticles.

The researchers raised C. elegans larvae on mats of bacteria doped with CeO2 nanoparticles at concentrations ranging from 1 to 100 nM. They then counted the surviving worms each day.

At the lowest concentration of 1 nM, the mean lifespan of the worms was 15 days. At the highest concentration of 100 nM, the worms lived 14 days. Compared to control worms' lifespan of nearly 18 days, the lifespan of worms exposed to nanoparticles decreased by 12% when averaged over all concentrations. The researchers think the shortened lifespan is related to oxidative stress.

"We never expected to find any negative effects at such a low concentration," Zhang says. This is the first study, he says, indicating adverse effects of nanoparticles in the 1- to 100-nM range.

Incidental Oligotrophication of North American Great Lakes Environ. Sci. Technol, DOI: 10.1021/es103892w

Other Headlines from American Chemical Society ...
 - Nanoparticles Shorten Roundworms' Lives
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 - First practical nanogenerator produces electricity with pinch of the fingers
 - 'Nano-bricks' may help build better packaging to keep foods fresher longer
 - Killer paper for next-generation food packaging

Other Headlines from Chinese Academy of Sciences ...
 - Nanoparticles Shorten Roundworms' Lives
 - Could 'Nano-Urchins' be the Key to Greener Batteries?
 - CAS Researchers Make Breakthrough in Hyper-Entangled Schrödinger Cat State
 - World's First Quantum Cryptography Network Developed in China
 - Preparing an anticancer drug carrier via crystallization of nano-particles

More Nanoparticles Headlines ...
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 - Building From the Ground Up, Researchers Construct RNA Nanoparticles to Safely Deliver Long-Lasting Therapy to Cells

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