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Beetles stand out using 'Avatar' tech
Date:4/19/2010

A new study suggests that jewel scarab beetles find each otherand hide from their enemiesusing the same technology that creates the 3D effects for the blockbuster movie Avatar.

According to researchers from the University of Texas, the jewel scarab species Chrysina gloriosa can distinguish between circularly polarized and unpolarized light. That ability could provide the beetles with a tremendous advantage, the researchers say, because most of the light reflected off these beetles' colorful bodies happens to be circularly polarized.

"The trait would allow the beetles to easily see each other while simultaneously hiding from predators that cannot see circular polarized light," said physicist Parrish Brady, who conducted the research with Molly Cummings. Their research is published in the May issue of the American Naturalist.

Circular polarization (CP for short) is a way of filtering light that causes the light's electric field to travel in a circular pattern, as opposed to oscillating in all directions as is does in unpolarized light. CP filters are now used to create 3D effects in movies, such as James Cameron's Avatar. Human eyes don't have the ability to perceive CP light, which is why we need special glasses to view films that use CP.

Scientists have known that jewel scarabs reflect CP light since the renowned physicist Albert Michelson discovered it in 1911. But to find out if they can also detect CP light (without the snazzy glasses), Parrish and Cummings took advantage of beetles' propensity to fly toward light. Through a series of experiments, they tested to see if jewel scarabs alter their flight patterns in the presence of CP light.

"We found significant differences in the beetles' flights toward circularly polarized and unpolarized light sources, suggesting that their eyes are outfitted to be sensitive to circularly polarized light," Brady said.

The finding makes Chrysina gloriosa
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Contact: Kevin Stacey
kstacey@press.uchicago.edu
773-834-0386
University of Chicago Press Journals
Source:Eurekalert

Page: 1 2

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