DAVID SCHARF / SCIENCE PHOTO LIBRARY DAVID SCHARF / SCIENCE PHOTO LIBRARY
Bacillus cerus bacteria. Coloured scanning electron micrograph (SEM) of small chains of Bacillus cerus bacteria. These common, rod- shaped Gram-type-positive bacteria are saprotrophs, organisms that feed and grow on dead and decaying organic material. They are found in soil, water, air and on vegetation. B. cerus can cause food poisoning. Magnification: x2,600 at 5x7cm size.
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