Diatom alga, Arachnoidiscus

Diatom alga, Arachnoidiscus

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Credit: KENT WOOD/SCIENCE PHOTO LIBRARY

Caption: Arachnoidiscus diatom. Light micrograph of two diatoms of the genus Arachnoidiscus. Diatoms are microscopic, unicellular algae that occur abundantly in freshwater and marine plankton. They form an important part of the food chain. Diatoms have a cell envelope (frustule) made of silica, often with delicate markings. The siliceous cell walls are preserved in deposits known as diatomaceous earth or diatomite. This is mined in some parts of the world. It is used as a mild abrasive, as a heat-insulating material and in various types of filter. Rheinberg differential technique used. Magnification x90 at 35mm size.

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Keywords: alga, algae, algal, arachnoidiscus, arachnoidisus, botany, circle, diatom, diatoms, light microgra, nature, phytoplankton, plankton, plant, type

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