DAVID SCHARF / SCIENCE PHOTO LIBRARY DAVID SCHARF / SCIENCE PHOTO LIBRARY
Soil bacteria. Coloured scanning electron micrograph (SEM) of Bacillus sp. soil bacteria (thick rod-shaped structures). These Gram-type- positive bacteria are saprotrophs, organisms that feed and grow on dead and decaying organic material. They are part of a diverse ecology of soil micro-organisms that play a vital role in decomposing and recycling organic matter. Magnification: x4,500 at 5x7cm size.
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