Graviperception in ciliates: Steps in the transduction chain
Ciliates represent suitable model systems to study the mechanisms of graviperception and signal transduction as they show clear gravity-induced behavioural responses (gravitaxis and gravikinesis). The cytoplasm seems to act as a “statolith” stimulating mechanosensitive ion channels in the cell membr...
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| Veröffentlicht in: | Advances in space research 2005, Vol.35 (2), p.296-299 |
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| creator | Hemmersbach, R. Krause, M. Bräucker, R. Ivanova, K. |
| description | Ciliates represent suitable model systems to study the mechanisms of graviperception and signal transduction as they show clear gravity-induced behavioural responses (gravitaxis and gravikinesis). The cytoplasm seems to act as a “statolith” stimulating mechanosensitive ion channels in the cell membrane. In order to test this hypothesis, electrophysiological studies with
Stylonychia mytilus were performed, revealing the proposed changes (de- or hyperpolarization) depending on the cell’s spatial orientation. The behaviour of
Paramecium and
Stylonychia 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, which are found to be in the range of 0.4×
g (gravikinesis) and 0.6×
g (gravitaxis). |
| doi_str_mv | 10.1016/j.asr.2005.03.024 |
| format | Article |
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Stylonychia mytilus were performed, revealing the proposed changes (de- or hyperpolarization) depending on the cell’s spatial orientation. The behaviour of
Paramecium and
Stylonychia 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, which are found to be in the range of 0.4×
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Stylonychia mytilus were performed, revealing the proposed changes (de- or hyperpolarization) depending on the cell’s spatial orientation. The behaviour of
Paramecium and
Stylonychia 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, which are found to be in the range of 0.4×
g (gravikinesis) and 0.6×
g (gravitaxis).</description><subject>Animals</subject><subject>Behavior, Animal</subject><subject>Calcium Channels - physiology</subject><subject>Ciliophora - physiology</subject><subject>Electrophysiology</subject><subject>Gravikinesis</subject><subject>Gravitaxis</subject><subject>Gravity Sensing - physiology</subject><subject>Hypergravity</subject><subject>Mechanoreceptors</subject><subject>Mechanosensitive ion channels</subject><subject>Microgravity</subject><subject>Paramecium</subject><subject>Paramecium - physiology</subject><subject>Potassium Channels - physiology</subject><subject>Signal Transduction - physiology</subject><subject>Space Flight</subject><subject>Space life sciences</subject><subject>Stylonychia</subject><subject>Stylonychia mytilus</subject><subject>Swimming</subject><subject>Threshold</subject><subject>Weightlessness</subject><issn>0273-1177</issn><issn>1879-1948</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2005</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNqFkEFLwzAUx4Mobk4_gBfpyVtr0qRNol5k6BQGHtRzSNNXltG1NUkHfnszN_CmpweP3___Hj-ELgnOCCblzTrT3mU5xkWGaYZzdoSmRHCZEsnEMZrinNOUEM4n6Mz7NcYk5xyfogkpJGU5llN0v3B6awdwBoZg-y6xXWJsa3UAf5u8BRj8bhVWkASnO1-P5gczK227c3TS6NbDxWHO0MfT4_v8OV2-Ll7mD8vUUJGH1EgWrxnGJBChG96UFeOkoGXDKgENiXtdCFEUhS7jU7rBwIBVEFFaaSroDF3vewfXf47gg9pYb6BtdQf96FXJhSwFJf-CRAqKOeYRJHvQuN57B40anN1o96UIVju3aq2iW7VzqzBV0W3MXB3Kx2oD9W_iIDMCd3sAooutBae8sdAZqK0DE1Td2z_qvwGnm4kz</recordid><startdate>2005</startdate><enddate>2005</enddate><creator>Hemmersbach, R.</creator><creator>Krause, M.</creator><creator>Bräucker, R.</creator><creator>Ivanova, K.</creator><general>Elsevier Ltd</general><scope>CGR</scope><scope>CUY</scope><scope>CVF</scope><scope>ECM</scope><scope>EIF</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>M7N</scope><scope>7X8</scope></search><sort><creationdate>2005</creationdate><title>Graviperception in ciliates: Steps in the transduction chain</title><author>Hemmersbach, R. ; Krause, M. ; Bräucker, R. ; Ivanova, K.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c382t-c94342c449e18af7f6b471536f4b8ef149ea588555a6209af0e4e4beaf73ba383</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2005</creationdate><topic>Animals</topic><topic>Behavior, Animal</topic><topic>Calcium Channels - physiology</topic><topic>Ciliophora - physiology</topic><topic>Electrophysiology</topic><topic>Gravikinesis</topic><topic>Gravitaxis</topic><topic>Gravity Sensing - physiology</topic><topic>Hypergravity</topic><topic>Mechanoreceptors</topic><topic>Mechanosensitive ion channels</topic><topic>Microgravity</topic><topic>Paramecium</topic><topic>Paramecium - physiology</topic><topic>Potassium Channels - physiology</topic><topic>Signal Transduction - physiology</topic><topic>Space Flight</topic><topic>Space life sciences</topic><topic>Stylonychia</topic><topic>Stylonychia mytilus</topic><topic>Swimming</topic><topic>Threshold</topic><topic>Weightlessness</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Hemmersbach, R.</creatorcontrib><creatorcontrib>Krause, M.</creatorcontrib><creatorcontrib>Bräucker, R.</creatorcontrib><creatorcontrib>Ivanova, K.</creatorcontrib><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>Algology Mycology and Protozoology Abstracts (Microbiology C)</collection><collection>MEDLINE - Academic</collection><jtitle>Advances in space research</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Hemmersbach, R.</au><au>Krause, M.</au><au>Bräucker, R.</au><au>Ivanova, K.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Graviperception in ciliates: Steps in the transduction chain</atitle><jtitle>Advances in space research</jtitle><addtitle>Adv Space Res</addtitle><date>2005</date><risdate>2005</risdate><volume>35</volume><issue>2</issue><spage>296</spage><epage>299</epage><pages>296-299</pages><issn>0273-1177</issn><eissn>1879-1948</eissn><abstract>Ciliates represent suitable model systems to study the mechanisms of graviperception and signal transduction as they show clear gravity-induced behavioural responses (gravitaxis and gravikinesis). The cytoplasm seems to act as a “statolith” stimulating mechanosensitive ion channels in the cell membrane. In order to test this hypothesis, electrophysiological studies with
Stylonychia mytilus were performed, revealing the proposed changes (de- or hyperpolarization) depending on the cell’s spatial orientation. The behaviour of
Paramecium and
Stylonychia 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, which are found to be in the range of 0.4×
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| fulltext | fulltext |
| identifier | ISSN: 0273-1177 |
| ispartof | Advances in space research, 2005, Vol.35 (2), p.296-299 |
| issn | 0273-1177 1879-1948 |
| language | eng |
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| source | MEDLINE; Elsevier ScienceDirect Journals |
| subjects | Animals Behavior, Animal Calcium Channels - physiology Ciliophora - physiology Electrophysiology Gravikinesis Gravitaxis Gravity Sensing - physiology Hypergravity Mechanoreceptors Mechanosensitive ion channels Microgravity Paramecium Paramecium - physiology Potassium Channels - physiology Signal Transduction - physiology Space Flight Space life sciences Stylonychia Stylonychia mytilus Swimming Threshold Weightlessness |
| title | Graviperception in ciliates: Steps in the transduction chain |
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