triggering
blepharisma sp.
euplotes sp.
paramecium multimicronucleatum
eating an oil drop
eating a ciliate
eating a paramecium
showing the swimming directions of Paramecium at different times: negative gravitaxis 5 min before lift-off (a, d); residual orientation 1 s after µg onset towards the centre of the rocket (originally induced by the centrifugal launch accelerations) (b, e); random distribution 80 s after µg onset. Each histogram represents >300 tracks
(fireworks?)