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  • 1
    ISSN: 1615-6102
    Keywords: Chemotaxis ; Information processing ; Oscillation ; Physarum polycephalum ; Thermal image camera
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The spatial and temporal pattern of oscillating temperatures on the cell surface of a plasmodial strand ofPhysarum polycephalum was measured with a sensitive thermal image camera. The longitudinal tension of the strand was studied simultaneously. In the absence of chemical stimulation, the phases of the temperature oscillation observed at various portions of the strand were entrained with almost coincidental phase. The temperature and tension oscillation were synchronized, although the phase difference between them was occasionally changed. With local chemical stimulation, the phase of the temperature oscillation advanced in the portion to which the plasmodium would be induced to migrate. The phases between temperature and tension oscillations then became constant. The mechanism by which the plasmodium processes local information of chemical stimulus to global information for the migration is discussed.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1615-6102
    Keywords: Physarum polycephalum ; Spatio-temporal pattern of Ca2+ ; concentration ; Information processing ; Intracellular Ca2+ ; Chemotaxis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The development of a spatio-temporal pattern of Ca2+ concentration by a plasmodium ofPhysarum polycephalum during chemotaxis was studied using fura-2. Whenever the cell displayed coordinated migration in one direction as a whole body, a spatiotemporal pattern was established with a characteristic feature along the longitudinal axis. Calcium concentration oscillated with a period of a few minutes within the cell; the mean concentration at the front was higher than that at the rear. When the cell was given an attractant only at the rear end, the mean concentration rose at the site of application with an immediate increase in the frequency of oscillation. First, the change of the frequency is propagated toward the other end and then the mean level of the Ca2+ concentration at the non-stimulated site decreases. As a result, the Ca2+ gradient is reversed along the cell, which then begins to migrate in a coordinated manner in the reverse direction. This study showed that the spatiotemporal pattern of Ca2+ concentration is closely related to information processing for coordinated migration in chemotaxis. The role of the pattern in that process is discussed.
    Type of Medium: Electronic Resource
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