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This is Scientific American 60-Second Science. I'm Cynthia Graber.This'll just take a minute.

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Cells in complex organisms sometimes respond to pressure and stress by growing in a preferred direction.

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The phenomenon, called mechanotaxis, helps create multicellular structures such as our organs.

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Now a common soil bacterium has been found to change its growth pattern in response to disturbances in its environment.

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And the discovery could provide a living system for testing strain in materials under heavy loads, like, say, bridges.

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The bacterium in question is called Bacillus mycoides.

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It was first characterized way back in 1842.

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Much more recently, researchers in the U.K.noticed that the Bacillus had unique growth patterns on solid cultures that contained structural defects.

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The scientists took a series of microscope photos of bacterial cultures on templates with a variety of defects and under different pressures.

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And the bacterial filaments turned a full 90 degrees in response to only 1 degree of structural distortion.

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The bacteria also grew towards a glass bead disturbing the culture.

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The research is in the journal PLoS One.

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If this technique can be better understood and manipulated, scientists might be able to develop a bacterial early warning system for our engineered environment.

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A big help from a small creature.

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Thanks for the minute, for Scientific American 60-Second Science. I'm Cynthia Graber.

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