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Behavioural changes in Paramecium and Didinium exposed to short-term microgravity and hypergravity.

Authors
Type
Published Article
Journal
Advances in Space Research
0273-1177
Publisher
Elsevier
Publication Date
Volume
16
Issue
7
Pages
231–234
Identifiers
PMID: 11542527
Source
Medline
License
Unknown

Abstract

The swimming behaviour of two ciliate species, Paramecium caudatum and Didinium nasutum was analyzed under microgravity and hypergravity. In Paramecium the differences between former upward and downward swimming rates disappeared under weightlessness. At microgravity the swimming rates equalled those of horizontally swimming cells at 1g. In contrast, the swimming rates of Didinium increased under microgravity conditions, being larger than horizontal swimming rates at 1g. These findings are in accordance with a hypothesis of gravireception in ciliates based on electrophysiological data, which considers the different topology of mechanoreceptor channels in theses species. The hypothesis received further support by data recorded under hypergravity conditions.

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