Coccoliths, SEM

Coccoliths, SEM

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Caption: Coccoliths, coloured scanning electron micrograph (SEM). Coccoliths are individual plates of calcium carbonate formed by coccolithophores (single-celled algae). The plates are arranged around the organism in a coccosphere but their function is unclear. Suggestions include: defence against grazing by zooplankton or infection by bacteria or viruses; maintenance of buoyancy; release of carbon dioxide for photosynthesis; to filter out harmful UV light; or in deep-dwelling species, to concentrate light for photosynthesis. Magnification: x2500 when printed 10 centimetres wide.

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Keywords: alga, algae, algal, biological, biology, botanical, botany, calcium carbonate, coccolith, coccolithophore, coccolithophores, coccoliths, coccosphere, colored, coloured, crystal, crystallised, crystals, cut out, cut outs, cut-out, cut-outs, cutout, cutouts, deposit, deposits, false-colored, false-colour, false-coloured, flora, nature, plant, plate, plates, scanning electron micrograph, scanning electron microscope, sem

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