Four diatoms, green algae

Four diatoms, green algae

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Credit: DR. HAROLD ROSE/SCIENCE PHOTO LIBRARY.

Caption: Light micrograph of a group of four diatoms (species unknown), members of a division of the algae family. Diatoms are microscopic unicellular organisms that occur abundantly in marine & freshwater plankton, where they form the basis of the food chain. The body is composed of two halves, which fit together like a tiny pill box. The cell walls contain silica, which is preserved in deposits known as siliceous or diatomaceous earths (ooze). Once hardened into rock it is called diatomite. The high porosity of this rock enables it to be used for filters, fillers & as a mild abrasive. Magnification: X 50 at 35mm size.

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Keywords: alga, algae, algal, botany, diatom, diatoms, light micrograph, nature, phytoplankton, plankton, plant

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