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He was surprised to see that bigger veins,
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, despite their robust looks, fail before tiny ones (blue indicates earliest failures; red, the latest),
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This system of visualizing plant plumbing gave better resolution than expensive and elaborate X-ray techniques had, Brodribb, Marmottant and Diane Bienaimé report online April 11 in the Proceedings of the National Academy of Sciences,
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DEATH BY BUBBLE By imaging a maidenhair fern leaflet (left panel) at 30-second intervals,
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, researchers could subtract the difference between the images (center panel) to see where an embolism formed. Images were colorized (right panel) by how much time had elapsed and then combined, as shown in the second clip,
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, to give a complete picture of the leaf’s response to water stress.

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