GERD GUENTHER / SCIENCE PHOTO LIBRARY GERD GUENTHER / SCIENCE PHOTO LIBRARY
Light micrograph of a Volvox aureus green alga spherical colony, stained with acridine orange to show the masses of bacteria cells attached to the outer side of the colony. The bacteria show yellow fluorescence, the chlorophyll of the colony cells on a layer out of focus show red auto fluorescence. Microscopic contrast method: Fluorescence contrast, blue excitation. Magnification 400x when printed at 10 centimetres wide.
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