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Keywords: gravikinesis
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Journal Articles
J Exp Biol (2010) 213 (24): 4158–4162.
Published: 15 December 2010
... orientation. Cell profile measurements from microscope images suggest that the characteristic front–rear body asymmetry accounts for the observed orientation rates. Gravikinesis may result from interactions between the propelling cilia and the sedimentary flow around the cell, and it seems unlikely...
Journal Articles
J Exp Biol (2010) 213 (1): 161–171.
Published: 1 January 2010
... by a negative gravikinesis. The graviresponse consists of a velocity-regulating physiological component (negative gravikinesis) and an additional orientational component. The latter is largely based on a physical mechanism but might, in addition, be affected by the frequency of ciliary reversals, which is under...
Journal Articles
J Exp Biol (2000) 203 (6): 1059–1070.
Published: 15 March 2000
... (negative gravikinesis). In the mutant, only increases in propulsion were observed, although the orientation-dependent sensitivity of the gravikinetic response was the same as in the wild-type population. Observed swimming speed and sedimentation rates in the wild-type and mutant cells were linearly related...
Journal Articles
J Exp Biol (1998) 201 (14): 2103–2113.
Published: 1 July 1998
...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...
Journal Articles
J Exp Biol (1996) 199 (10): 2199–2205.
Published: 1 October 1996
... Limited 1996 Paramecium biaurelia gravitaxis gravikinesis hypergravity centrifuge microscope microgravity threshold As long ago as 1906, Jennings noted that at least some and probably many protozoa use gravity as an environmental stimulus for orientation. Some, such as Paramecium...
Journal Articles
J Exp Biol (1994) 197 (1): 271–294.
Published: 1 December 1994
... 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...
Journal Articles