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He was surprised to see that bigger veins,
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, as seen in an oak leaf (lower right) and Pteris fern (top). And networks in ferns with simpler branching patterns, as in the Adiantum ferns at bottom left, crash quickly.
This system of visualizing plant plumbing gave better resolution than expensive and elaborate X-ray techniques had,
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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,
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, as shown in the second clip, to give a complete picture of the leaf’s response to water stress.

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