Motility of Microcoleus chthonoplastes subjected to different light intensities quantified by digital image analysis
Light dependent movement of gliding cyanobacteria has been studied for more than a hundred years and several types of response to light have been observed (Häder 1987). The following concepts have been recommended by an ad hoc committee on behavioral terminology, (Diehn et al. 1979): Phototaxis: Orientation of movement with respect to a directional light field; photokinesis: by which the steady-state speed of movement is related to the total light intensity and a photophobic response: where the movement is altered by a spatial or temporal change in light intensity. Most photosynthetic organisms display one or more of these behaviours in their search of suitable light conditions (Castenholz 1982).
KeywordsLight Intensity Digital Image Analysis Total Movement White Pixel Scalar Irradiance
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