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Simulation of phototaxis in the flagellateEuglena gracilis

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Abstract

A three-dimensional model of the flagellateEuglena gracilis was developed to simulate phototaxis and movement in space. The simulation of the phototactic behavior was compared with thein vivo behavior in order to determine the mechanism of orientation with respect to light. Phototactic behavior with respect to one light source, can be explained by the shading hypothesis as well as by a dichroic orientation of the absorbing vectors of the photoreceptor pigments. In contrast, the behavior of the cells when exposed to two perpendicular light beams is not compatible with the shading hypothesis. Likewise, the phototactic orientation of stigmaless cells cannot be accounted for on the basis of the shading hypothesis. In contrast, simulations andin vivo observations of the behavior under polarized light strongly indicate the validity of the dichroic orientation of the photoreceptor pigments.

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  1. Institut für Botanik und Pharmazeutische Biologie der Friedrich-Alexander-Universität, Staudtstr. 5, D-91058, Erlangen, Germany

    Donat-P. Häder

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Häder, DP. Simulation of phototaxis in the flagellateEuglena gracilis . J Biol Phys 19, 95–108 (1993). https://doi.org/10.1007/BF00700253

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