Geotaxis in motile micro-organisms.
D018407:Bacterial Physiological Phenomena; D055592:Biophysical Phenomena; D001703:Biophysics; D002465:Cell Movement; D006112:Gravitation; D007103:Immobilization; D008297:Male; D008954:Models, Biological; D009949:Orientation; D010247:Paramecium / Q000502:physiology*; D013094:Spermatozoa / Q000502:physiology; D014867:Water
D014867:Water