FRANK FOX / SCIENCE PHOTO LIBRARY FRANK FOX / SCIENCE PHOTO LIBRARY
Diatoms (Cylindrotheca fusiform), differential interference contrast (DIC) light micrograph. Diatoms are a group of photosynthetic, single-celled algae containing about 10,000 species. They form an important part of the plankton at the base of the marine and freshwater food chains. Magnification: x350 when printed 10 centimetres tall.
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