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- W2084202289 abstract "Gravitactic orientation was investigated in the unicellular photosynthetic flagellate, Euglena gracilis, under different accelerations between 0 and 1.5 × g during a recent space flight on board the American shuttle Columbia. The threshold for gravitaxis was found at ≤ 0.16 ≤ g. Above the threshold the precision of orientation increased with acceleration in a sigmoidal fashion and reached saturation at about 0.32 ≤ g, a behavior typical for physiological receptors. At accelerations above the saturation point the cells were closely aligned with the gravity vector (negative gravitaxis) and deviated more and more as the acceleration decreased. Obviously the gravireceptor responds to an error signal that elicits a course correction, again indicating the involvement of an active physiological gravireceptor. No adaptation of the cells to the conditions of weightlessness could be observed over the duration of the space mission (12 days). After landing, the cells showed a normal gravitactic behavior at 1 ≤ g." @default.
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- W2084202289 date "1995-07-01" @default.
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- W2084202289 title "Gravitaxis in the Flagellate Euglena gracilisis Controlled by an Active Gravireceptor" @default.
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- W2084202289 doi "https://doi.org/10.1016/s0176-1617(11)82011-0" @default.
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