BROOKHAVEN NATIONAL LABORATORY / SCIENCE PHOTO LIBRARY BROOKHAVEN NATIONAL LABORATORY / SCIENCE PHOTO LIBRARY
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Scientists placing a poplar tree (Populus sp.) sapling in a positron emission tomography (PET) scanner. This is part of research into plant responses to environmental stress. The plant is put under stress and then individual leaves are exposed to carbon dioxide gas that contains a radioactive carbon tracer. The carbon, which is converted into sugar by the plant, can be imaged by the PET scanner as it moves through the plant and is used in biochemical pathways. Photographed at the Brookhaven National Laboratory, New York, USA.
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