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Graviresponses of Paramecium biaurelia during parabolic flights

Krause, Martin and Bräucker, Richard and Hemmersbach, Ruth (2006) Graviresponses of Paramecium biaurelia during parabolic flights. Protoplasma, 229 (2-4), pp. 109-116. DOI: 10.1007/s007090060207x ISSN 0033-183X (Print), 1615-6102 (Online)

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Official URL: http://www.springerlink.com/content/g607376611041573/


The thresholds of graviorientation and gravikinesis in Paramecium biaurelia were investigated during the 5th DLR (German Aerospace Center) parabolic-flight campaign at Bordeaux in June 2003. Parabolic flights are a useful tool for the investigation of swimming behaviour in protists at different accelerations. At normal gravity (1 g) and hypergravity (1 g to 1.8 g), precision of orientation and locomotion rates depend linearly on the applied acceleration as seen in earlier centrifuge experiments. After transition from hypergravity to decreased gravity (minimal residual acceleration of less than 10<sup>-2</sup> g), graviorientation as well as gravikinesis show a full relaxation with different kinetics. The use of twelve independent cell samples per flight guarantees high data numbers and secures the statistical significance of the obtained data. The relatively slow change of acceleration between periods of microgravity and hypergravity (0.4 g/s) enabled us to determine the thresholds of graviorientation at 0.6 g and of gravikinesis at 0.4 g. The gravi-unrelated propulsion rate of the sample was found to be 874 μm/s), exceeding the locomotion rate of horizontally swimming cells (855 μm/s). The measured thresholds of graviresonses were compared with data obtained from earlier centrifuge experiments on the sounding rocket Maxus-2. Measured thresholds of gravireactions indicate that small energies, close to the thermal noise level, are sufficient for the gravitransduction process. Data from earlier hypergravity experiments demonstrate that mechanosensitive ion channels are functioning over a relative wide range of acceleration. From this, we may speculate that gravireceptor channels derive from mechanoreceptor channels.

Item URL in elib:https://elib.dlr.de/46591/
Document Type:Article
Title:Graviresponses of Paramecium biaurelia during parabolic flights
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Krause, MartinRuhr-Universität BochumUNSPECIFIED
Date:18 December 2006
Journal or Publication Title:Protoplasma
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1007/s007090060207x
Page Range:pp. 109-116
Springer Wien, UNSPECIFIED
ISSN:0033-183X (Print), 1615-6102 (Online)
Keywords:Gravitaxis, Orientation, Parabolic flight, Threshold, Paramecium biaurelia
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:17 Aug 2007
Last Modified:27 Apr 2009 13:23

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