Other
Scientific paper
Aug 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994adspr..14...21b&link_type=abstract
Advances in Space Research, Volume 14, Issue 8, p. 21-34.
Other
4
Scientific paper
The acellular slime mold Physarum polycephalum is used as a model system to investigate the graviresponse of single cells which possess no receptors specialized for the perception of gravity. To obtain insights into the gravity-signal transduciton mechanism the light response of the cell is used: Macroplsmodia of the slime mold show clear geo- and phototaxes. Gravity increases and white light decreases transiently the concentration frequency of plasmodial strands whereby both responses follow the same time pattern. Since mitochodria play major role in changing the contraction rhythm in response to light and gravity stimuli, the simultaneous and subsequent inductions of the opposing light and gravity responses and their mutual influences on one another were investigated. The experiments were performed in weightlessness (0 g) - simulated on the fast-rotating clinostat as well as in actual weightlessness during the IML-1 Space-Shuttle mission. The results indicate that mitochondria (chondriome) are part of the acceleration-stimulus reaction chain in Physarum. Two models for a direct gravireceptor mechanism are discussed.
Block Ian
Briegleb Wolfgang
Wolke Andreas
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