HERVE CONGE, ISM / SCIENCE PHOTO LIBRARY HERVE CONGE, ISM / SCIENCE PHOTO LIBRARY
Cyanobacteria strands. Light micrograph of strands of the Nostoc cyanobacterium, a filamentous organism that has the ability to fix atmospheric nitrogen, thereby playing a major role in soil fertility. It has a wide distribution and is commonly found in soil, on mud, rocks or other plants. It also forms the partner of a number of lichens. Cyanobacteria were among the first forms of life. Magnification: x280 when printed at 10 centimetres across.
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