STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Diatom. Scanning electron micrograph (SEM) of a Triceratium sp. diatom. This is a planktonic unicellular alga. It has a mineralised cell wall (frustule) divided into two halves. The frustule contains silica and provides protection and support. Magnification: x2000 when printed 10cm wide.
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