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/
Abstract
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/ | ||||||||||||
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Document Type: | Article | ||||||||||||
Title: | Graviresponses of Paramecium biaurelia during parabolic flights | ||||||||||||
Authors: |
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Date: | 18 December 2006 | ||||||||||||
Journal or Publication Title: | Protoplasma | ||||||||||||
Refereed publication: | Yes | ||||||||||||
Open Access: | No | ||||||||||||
Gold Open Access: | No | ||||||||||||
In SCOPUS: | No | ||||||||||||
In ISI Web of Science: | Yes | ||||||||||||
Volume: | 229 | ||||||||||||
DOI : | 10.1007/s007090060207x | ||||||||||||
Page Range: | pp. 109-116 | ||||||||||||
Editors: |
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ISSN: | 0033-183X (Print), 1615-6102 (Online) | ||||||||||||
Status: | Published | ||||||||||||
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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