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  • 1980-1984  (2)
  • Cell & Developmental Biology  (1)
  • Rhythmic contraction  (1)
  • assembly
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  • 1
    Electronic Resource
    Electronic Resource
    ATP oscillation inPhysarum plasmodium (1981)
    Springer
    Protoplasma 109 (1981), S. 159-168 
    Details
    ISSN: 1615-6102
    Keywords: ATP level ; Oscillation ; Plasmodium ; Physarum ; Rhythmic contraction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Using bioluminescence of luciferin-luciferase, we showed that ATP leaked out rhythmically from a strand segment ofPhysarum plasmodium made permeable with caffeine-arsenate. With simultaneous measurement of isometric tension rhythm of the strand, it was revealed that the period and phase of oscillation in ATP leakage correspond well with those of tension production. Further, microinjection of luciferin-luciferase into the plasmodial strand indicated that the intracellular luminescence of luciferin-luciferase also oscillates with the same period and in the same phase as the tension rhythm. The free ATP concentration in a homogenate ofPhysarum plasmodium was of the order of 10 μM, but if the homogenate was heated in boiling water, the intensity of luminescence suddenly increased 10–100 fold. ATP available for mechanical workin vivo is thus supposed to be at a much lower level than the total average, which was found in the range of 0.2–0.7 mM.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01287637
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Simultaneous oscillations of Ca2+ efflux and tension generation in the permealized plasmodial strand of physarum (1981)
    New York, NY : Wiley-Blackwell
    Cell Motility and the Cytoskeleton 1 (1981), S. 433-443 
    Details
    ISSN: 0886-1544
    Keywords: Physarum ; acellular slime mold ; calcium ion ; calcium-ionophore ; cytoplasmic contraction ; oscillation ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Calcium is now generally thought to play a key role in regulating a variety of cellular movements. When the plasmodium of Physarum polycephalum was treated with the calcium-ionophore A23187 or the quasi-ionophore amphotericin B, Ca2+ leaked out. Ca2+ efflux into the ambient solution from the plasmodial strand segment was measured by the luminescence of a photoprotein aequorin, and the tensile force production was recorded simultaneously. Ca2+ efflux oscillated with the same period as the cycle of tension generation in the strand, but the phase of cyclic changes in Ca2+ efflux was opposite to that of tension generation. That is, Ca2+ efflux fell in the increasing tension phase and rose in the decreasing tension phase. Cyclic changes in efflux of Ca2+ are provisionally interpreted as reflecting corresponding changes in concentrations of free Ca2+ in the cytoplasm.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cm.970010404
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    Paper (German National Licenses)
    Fulltext
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