EYE OF SCIENCE / SCIENCE PHOTO LIBRARY EYE OF SCIENCE / SCIENCE PHOTO LIBRARY
Ceramic filter, coloured scanning electron micrograph (SEM). This filter is based on the frustule, or cell wall, of diatoms. Diatoms are single-celled algae that have a frustule rich in silica and covered in tiny holes. Magnification: x80 when printed at 10 centimetres wide.
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