Unidentified diatom alga

Unidentified diatom alga

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Caption: Diatom alga. Coloured scanning electron micrograph (SEM) of an unidentified diatom alga. It has a patterned cell wall, or frustule, made of silica and pectin. The wall is in two halves which fit neatly together. Diatoms can be elongated (pennate, as here) or circular (centric). They are found in both marine and freshwater, and are a major constituent of plankton. As such, they are of great importance to the food chains in their environment. Magnification: x1, 150 at 5x7cm size. x4000 at 7x9.5"

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Keywords: alga, algae, algal, botany, diatom, diatoms, frustule, nature, pennate, pennate diatom, phytoplankton, plankton, plant, scanning electron micrograph, sem, shape, type, unidentified

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