AbstractThe 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.


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    Title :

    Gravitational response of the slime mold Physarum


    Contributors:
    Block, I. (author) / Wolke, A. (author) / Briegleb, W. (author)

    Published in:

    Publication date :

    1994-01-01


    Size :

    14 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English



    Gravitational Response of the Slime Mold Physarum

    Block, I. / Wolke, A. / Briegleb, W. et al. | British Library Conference Proceedings | 1994


    Gravity-related behaviour of the acellular slime mold Physarum polycephalum

    Block, I. et al | British Library Online Contents | 1994