Credit: GERD GUENTHER/SCIENCE PHOTO LIBRARY

Caption: Phototaxis in Euglena algae. Light microscope differential interference contrast (DIC) footage of Euglena sp. algae demonstrating phototaxis (movement stimulated by light). Euglena is photosynthetic, using the energy of sunlight to synthesise food. The characteristic red eyespot is sensitive to light, allowing it to move towards sunlight. When the field diaphragm of the microscope is narrowed (start of clip), the Euglena cells move into the lighted area in the middle of the field of view. When the diaphragm is opened at the end of the clip, the cells move outwards and re-distribute across the increased field of view. Magnification: x195 at 10 centimetres across.

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Keywords: alga, algae, biological, biology, botanical, botany, cell, cells, cellular, chloroplast, closed, dic, differential interference contrast, euglena, euglenophyceae, eye-spot, field diaphragm, flora, light micrograph, light microscope, light microscopy, locomotion, many, microscope eyepiece, microscopic, motile, motion, movement, moving, multiple, narrowed, nature, opened, paramylon, photosynthesis, photosynthetic, phototactic, phototaxis, plant, protist, red eyespot, single-celled, swimming, unicellular

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Phototaxis in Euglena algae

K004/1875 Rights Managed

Downloadable master

Duration: 00:00:39

Frame size: 1920x1080

Frame rate: 24

Audio: No

Format: QuickTime, Photo JPEG 100%, progressive scan, square pixels

File size: 903.8M

Original

Capture format: EOS 5D MK2

Codec: Uncompressed 8-bit 4:2:2

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