Reference

R. Hemmersbach-Krause, W. Briegleb, Donat.-P. Häder, Helmut Plattner (1991): Gravity effects on Paramecium cells: an analysis of a possible sensory function of trichocysts and of simulated weightlessness on trichocyst exocytosis – Europ. J. Protistol. – 27: 85 - 92.