FRANK FOX / SCIENCE PHOTO LIBRARY FRANK FOX / SCIENCE PHOTO LIBRARY
Light microscope footage of barium sulphate crystals (square) in the terminal vacuole of a desmid. The crystals appear as small square objects, exhibiting Brownian motion due to impacts from water molecules. Their function is unclear. Desmids are a common group of freshwater single-celled algae that have intricate cell walls.
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