.... striatum and D. nasutum at temperatures ranging from 20 to 5°C. Fig. 5. Temperature (A,C,E,G) and viscosity, expressed as equivalent temperature, (B,D,F,H) dependency of Didinium nasutum (left-hand column) and Colpidium striatum (right-hand column) swimming speed. Panels A, B, E and F...

...Joachim Pernberg; Hans Machemer ABSTRACT In the gymnostome ciliate Didinium nasutum , swimming behaviour depends upon the cyclic activity of about 3000 cilia. The normal beating mode, resulting in forward swimming of the cell, is characterized by a posteriad effective beat (18 ° left...

... with acceleration. In Didinium nasutum , negative gravikinesis was documented at 1 g in downward-swimming specimens only, which agrees with the mechanosensory organization of this cell. Hypergravity induced the gravikinesis of Didinium to change sign. In both species, and at all accelerations tested, a neutral...

...Ritsuo Hara; Hiroshi Asai; Yutaka Naitoh ABSTRACT The carnivorous ciliate Didinium nasutum discharged its extrusive organelles when a strong inward current was injected into the cell in the presence of external Ca 2+ ions. In the absence of external Ca 2+ ions, the strong inward current produced...