ASA THORESEN / SCIENCE PHOTO LIBRARY ASA THORESEN / SCIENCE PHOTO LIBRARY
Colour enhanced scanning electron micrography of a freshwater Diatom. Diatoms are single-celled photosynthetic algae, of which there are about 100,000 species. They have mineralized cell walls (frustules) that contain silica and provide protection and support. The diatoms form an important part of the plankton at the base of the marine and freshwater food chains. Magnification: 4000x.
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