GERD GUENTHER / SCIENCE PHOTO LIBRARY GERD GUENTHER / SCIENCE PHOTO LIBRARY
Light microscope footage of Euglena gracilis algae, showing the metabolic movement and the beating flagellum of the elongate cells. Euglena (from the Greek eu , good or true, and glene , eye) is probably the best-known euglenoid genus. In this preparation the remaining water film is rather thin to show the cell surface structure. Most of the Euglena cells perform amoeboid, metabolic movements. Euglenoids are among the most ancient lineages of eukaryotic algae. Euglenoids display a surface structure composed of parallel ribbonlike strips, running lengthwise down the cells. The algae contain Paramylon grains (a starch-like carbohydrate) as well as a characteristic red eyespot. Euglena gracilis is photosynthetic, using the energy of sunlight to synthesize food. The eyespot is sensitive to light, allowing it to move towards sunlight. Microscopic contrast method used: differential interference contrast. Captured field width: 0.23mm. Sample taken from of an algae culture of the culture collection of algae at the university of Cologne, CCAC.
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