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Graviperception in ciliates: thresholds and gravireceptor potentials

Hemmersbach, Ruth and Krause, Martin and Bräucker, Richard (2005) Graviperception in ciliates: thresholds and gravireceptor potentials. 9th European Symposium on Life Sciences Research in Space and 26th Annual International Gravitational Physiology Meeting, 2005-06-26 - 2005-07-01, Köln. (Unpublished)

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Abstract

Due to their clear gravity-induced behavioral responses (gravitaxis and gravikinesis) ciliates represent suitable model systems to study the mechanisms of graviperception and signal transduction. The cytoplasm is proposed to act as a "statolith" which stimulates polarily distributed mechanosensitive ion channels in the cell membrane. This results in a change of the membrane potential which in turn controls the beating activity of the cilia and thus the behaviour of the cell. In order to test this hypothesis, the membrane potential of isolated Stylonchia mytilus cells was measured during a defined change of the cell's spatial orientation. The data agree with the proposed changes (de- or hyperpolarization) depending on the orientation of the cell. The behaviour of Paramecium and Stylonchia was also analyzed during variable acceleration conditions of parabolic flights (5th German Parabolic Flight Campaign, 2003). The corresponding data confirm the relaxation of the graviresponses in microgravity as well as the existence of thresholds of graviresponses [0.4 x g (gravikinesis) and 0.6 x g (gravitaxis)].

Item URL in elib:https://elib.dlr.de/46843/
Document Type:Conference or Workshop Item (Speech)
Title:Graviperception in ciliates: thresholds and gravireceptor potentials
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Hemmersbach, RuthUNSPECIFIEDUNSPECIFIED
Krause, MartinRuhr-Universität Bochum, Institut für NeurobiologieUNSPECIFIED
Bräucker, RichardUNSPECIFIEDUNSPECIFIED
Date:2005
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Unpublished
Keywords:gravisensors, ion channels, mechanoreceptor
Event Title:9th European Symposium on Life Sciences Research in Space and 26th Annual International Gravitational Physiology Meeting
Event Location:Köln
Event Type:international Conference
Event Dates:2005-06-26 - 2005-07-01
Organizer:ESA / ISGP
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:20 Feb 2007
Last Modified:27 Apr 2009 13:25

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