MAREK MIS / SCIENCE PHOTO LIBRARY MAREK MIS / SCIENCE PHOTO LIBRARY
Citric acid crystals. Polarized light micrograph of a section through crystals of citric acid (tricarboxylic acid). Citric acid can be obtained from natural products such as the juices of citric fruits e.g.. It is also obtained by fermentation of glucose (citric acid cycle) and by synthesis. Magnification: x200 when printed at 10 centimetres tall.
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