Phototaxis of Dictyostelium discoideum Slugs
نویسندگان
چکیده
منابع مشابه
Sensory Behaviour in Dictyostelium Discoideum Slugs: Phototaxis and Thermotaxis Are Not Mediated by a Change in Slug Speed
The speed of sustained migration of Dictyostelium discoideum slugs was similar in a temperature gradient and at different light intensities, including a light intensity sufficient to cause significant disorientation of slugs. No change was observed in slug speed in the presence of high levels of Slug Turning Factor (STF), a low molecular weight compound through which phototaxis and thermotaxis ...
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Dictyostelium discoideum slugs migrating in the absence of external stimuli tend to continue migrating in the original randomly 'chosen' direction. Spontaneous deviations from the starting direction accumulate with time at a rate that measures the 'physiological noise' in the slugs' steering mechanism. Most of the spontaneous turning signals arise in the transduction chain 'downstream' of the c...
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This paper investigates the light-driven migration of the multi-cellular microorganism Dictyostelium discoideum as a potential bio-actuation mechanism in microsystems. As a platform for slug migration we use microscale confinements, which consist of intersecting microchannels fabricated from solidified agar-water solution. The agar surface provides necessary moisture to the slugs during the exp...
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Phototaxis and thermotaxis by Dictyostelium discoideum slugs on water agar were impaired by the presence in the agar of adenosine, which is a cyclic AMP receptor antagonist in aggregating amoebae. Caffeine, and presumably its analogue theophylline, inhibit cyclic AMP signalling in aggregating amoebae of D. discoideum. Both compounds perturbed slug behaviour in a similar manner to adenosine, as ...
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Phototaxis and thermotaxis by slugs of Dictyostelium discoideum show transitions that result in bimodality in phototaxis and temperature-dependent orientation up or down temperature gradients. New steps in the sensory transduction chain for these kinds of behaviour are elucidated from studies using inorganic salts (Ca2+, EGTA, KF) and several mutants. KF enhances bimodality of phototaxis, impro...
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