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Diatoms. Coloured scanning electron micrograph (SEM) of diatoms (blue) attached to algae (brown). The diatoms are a group of photosynthetic, single-celled algae containing about 100,000 species. They form an important part of the plankton at the base of the freshwater and marine food chains. The characteristic feature of diatoms is their intricately patterned, glass-like cell wall, or frustule. Magnification x500 when printed 10 centimetres wide.
May 13th, 2013
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