Green alga, light micrograph
Light micrograph (Composite image of fluorescent microscopy combined with brightfield) of Micrasterias sp. desmid green algae. Desmids are a common group of freshwater single-celled algae that have intricate cell walls. Micrasterias are highly adapted to nutrient-poor, acidic water. The ultraviolet light used to illuminate the specimen causes the chlorophyll to autofluoresce in red revealing the intricate shape of the chloroplasts. Magnification: x300 when printed at 10 centimetres wide at its longest edge., by HAKAN KVARNSTROM / SCIENCE PHOTO LIBRARY
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