Cell Structure and Function
Online ISSN : 1347-3700
Print ISSN : 0386-7196
ISSN-L : 0386-7196
Oscillation in pH on the Surface of the Physarum Plasmodium
Soichi NakamuraNoburo Kamiya
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1985 Volume 10 Issue 2 Pages 143-149

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Abstract
Cyclic changes in the pH of the slime layer on the surface of the Physarum plasmodium (surface pH) were measured, with special reference to the contraction-relaxation cycle. Measurements were made with a specially designed small antimony electrode. The oscillation detected was confirmed by spectrophotometry with a pH indicator dye (bromcresol purple). A clear cor-relation was found between cyclic changes in the surface pH of a plasmodial strand segment and the contraction-relaxation cycle. The surface pH oscillated with the same period but in opposite phase to the cyclic tensile force pro-duction, as does the cytoplasmic pH. The peak-to-peak amplitude of the oscillation usually was of the order of a 0.1 pH unit or less. No stretch acti-vation was found with the pH oscillation.
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© Japan Society for Cell Biology
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