POWER AND SYRED / SCIENCE PHOTO LIBRARY POWER AND SYRED / SCIENCE PHOTO LIBRARY
Nitrogen-fixing bacterium. Coloured scanning electron micrograph of the nitrogen-fixing bacterium Rhizobium leguminosarum. Living inside the roots of a plant, these bacteria release an enzyme, nitrogenase, which converts atmospheric nitrogen into a usable organic form - something the plant cannot do for itself. Magnification: x9500 at 6x4.5cm size.
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