Diatom frustule, SEM

  • Anne Weston, Francis Crick Institute
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Diatom frustule, SEM. Anne Weston, Francis Crick Institute. Attribution-NonCommercial 4.0 International (CC BY-NC 4.0). Source: Wellcome Collection.

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False-coloured scanning electron micrograph of a fragment from a diatom frustule. Diatoms are types of algae which are often unicellular though can exist in colonies. They are found in most aquatic environments including fresh and marine waters. A frustule is a hard external shell made of silica which acts as a skeleton to support the diatom. Horizontal width of image is 34.5 micrometres.

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