![]() ![]() ![]() For polarized light, the action spectrum had two additional peaks at 468 mμ and 508 mμ. Both dark-grown and dark-adapted Euglena showed spectral peaks similar to those of the light-grown cells. ![]() The action spectrum for phototaxis, or directed orientation, had a peak near 420 mμ and showed a maximum near 490 mμ. The action spectrum for photokinesis showed two peaks, a major one near 465 mμ, and another in the neighborhood of 630 mμ, having the values of 0.18 mm./sec. Polarized light appeared to be more effective (0.18 mm./sec. candles, and then decreased with increasing light intensities. The rate of swimming in white light was found to increase with light intensity until it reaches 0.16 mm./sec. Photokinesis or the non-directed rate of swimming of Euglena gracilis for various light intensities was studied. ![]()
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