FRANK FOX / SCIENCE PHOTO LIBRARY FRANK FOX / SCIENCE PHOTO LIBRARY
Assorted diatoms. Interphako contrast, light micrograph of a circular arrangement of various diatoms. Diatoms are planktonic unicellular algae. They have a mineralised cell wall (frustule) divided into two halves. The frustule contains silica and provides protection and support. Diatoms form an important part of the plankton at the base of the marine and freshwater food chains. Magnification: x80 when printed at 10 centimetres across.
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