... Paramecium caudatum Paramecium inhabits an environment that is mechanically characterized by the dominant influence of viscous forces. In such a viscous environment, defined as low Reynolds number hydrodynamics, organisms move under conditions that greatly differ from those of our aerial...

...Takuji Ishikawa; Masateru Hota SUMMARY The interaction between two swimming Paramecium caudatum was investigated experimentally. Cell motion was restricted between flat plates,and avoiding and escape reactions were observed, as well as hydrodynamic interactions. The results showed that changes...

... in Paramecium. J. Cell Sci. 95 , 219 -230. Dunlap, K. ( 1977 ). Localization of calcium channels in Paramecium caudatum. J. Physiol. 271 , 119 -133. Erxleben, C. and Plattner, H. ( 1994 ). Ca 2+ release from subplasmalemmal store as a primary event during exocytosis in Paramecium cells. J...

... for the ciliary movement of Paramecium caudatum was examined. Arginine kinase and adenylate kinase activities were detected in the cilia. To demonstrate that phosphoarginine satisfactorily supplies high-energy phosphate compounds into the narrow ciliary space, we prepared an intact ciliated cortical sheet from...

...Richard Bräucker; Akira Murakami; Kazuko Ikegaya; Kenjiro Yoshimura; Keiichi Takahashi; Sigrun Machemer-Röhnisch; Hans Machemer ABSTRACT The kinetics of gravitaxis and gravikinesis in Paramecium caudatum were investigated by employing (1) step transitions from normal gravity (1 g...

...Kazunori Oami ABSTRACT The membrane potential responses of Paramecium caudatum to the external application of bitter substances were examined by employing conventional electrophysiological techniques. Mutant cells defective in voltage-gated Ca 2+ channels were used to record the potential responses...

... functions of gravitational acceleration. Comparisons of cell populations from different cultures suggest that there is an age-dependent change in gravikinesis. In starved Paramecium caudatum (7-day cultures), the kinetic responses antagonizing sedimentation (negative gravikinesis) increased...

... by Company of Biologists 1994 thermoreceptor current mechanoreceptor current Paramecium caudatum In a previous paper ( Tominaga and Naitoh, 1992a ) we demonstrated that the ciliate protozoan Paramecium caudatum exhibited a depolarizing membrane potential response to thermal stimulation...

...Hiroyuki Nakazato; Yutaka Naitoh ABSTRACT The quantitative relationship between chemoaccumulation and locomotor activity in specimens of Paramecium caudatum was examined by employing a novel chemoaccumulation assay system. Distribution of the specimens in two adjoining solutions with different...

...Takashi Tominaga; Yutaka Naitoh ABSTRACT The overall membrane potential response of the ciliate Paramecium caudatum to a rise in the temperature of its environment was depolarizing when the ambient temperature before stimulation ( T e ) was equal to or higher than the culture temperature (T c...

..., desensitization of mechanosensory channels and hyperactivation of ciliary activity in straight swimmers. * To whom reprint requests should be addressed. 23 9 1991 © 1992 by Company of Biologists 1992 Paramecium caudatum hypergravity swimming velocity gravikinesis gravitaxis...