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Gravikinesis in Stylonychia mytilus is based on membrane potential changes

Krause, Martin and Bräucker, Richard and Hemmersbach, Ruth (2010) Gravikinesis in Stylonychia mytilus is based on membrane potential changes. Journal of Experimental Biology, 213 (1), pp. 161-171. The Company of Biologists. DOI: 10.1242/jeb.030940 ISSN 0022-0949

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The graviperception of the hypotrichous ciliate Stylonchia mytilus was investigated using electrophysiological methods and behavioural analysis. It is shown that Stylonchia can sense gravity and thereby compensates sedimentation rate 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 physiological control. We show that the external stimulus of gravity is transformed to a physilogical signal, activating mechanosensitive calcium and potassium channels. Earlier electrophysical experiments revealed that these ion channels are distributed in the manner of two opposing gradients over the surface membrane. Here, we show, for the first time, records of gravireceptor potentials in Stylonchia that are presumably based on this two-gradient system of ion channels. The gravireceptor potentials had maximum amplitudes of approximately 4mV and slow activation characteristics (0.03 mV/s-1). The presumptive number of involved graviperceptive ion channels was calculated and correlates with the analysis of the locomotive behaviour.

Item URL in elib:https://elib.dlr.de/62148/
Document Type:Article
Title:Gravikinesis in Stylonychia mytilus is based on membrane potential changes
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Krause, MartinDep. of General Zoology and Neurobiology, Ruhr-University Bochum, Bochum, GermanyUNSPECIFIED
Bräucker, RichardDLR_School_Lab Köln, Cologne, GermanyUNSPECIFIED
Date:January 2010
Journal or Publication Title:Journal of Experimental Biology
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1242/jeb.030940
Page Range:pp. 161-171
Publisher:The Company of Biologists
Keywords:Stylonchia mytilus; ciliate; behaviour; electrophysiology; mechanosensitivity; gravikinesis; gravitaxis; gravireceptor potential
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W FR - Forschung unter Weltraumbedingungen (old)
DLR - Research area:Space
DLR - Program:W FR - Forschung unter Weltraumbedingungen
DLR - Research theme (Project):W - Vorhaben Biowissenschaftliche Nutzerunterstützung (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Aerospace Medicine > Biomedical Science Support Center
Deposited By: Lütz, Gertrud
Deposited On:22 Feb 2010 12:42
Last Modified:10 Jan 2019 15:48

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