DR JEREMY BURGESS / SCIENCE PHOTO LIBRARY DR JEREMY BURGESS / SCIENCE PHOTO LIBRARY
False-colour scanning electron micrograph of the nitrogen-fixing bacteria, Rhizobium leguminosarum. Rhizobium is a free-living soil bacterium for most of its life, but at times forms a symbiotic association with the roots of leguminous plants. In return for breaking down atmospheric nitrogen & converting it into a form the plant can use, the bacterium gains access to the plant's carbohydrate food stores & is kept safe in the plant's tissue. Magnification: x2000 at 35mm size. Yellow tint.
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