変形および電流刺激下におけるゾウリムシの原形質流動
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概要
- 論文の詳細を見る
Locomotion of Paramecium was inhibited of stopped by a viscous medium (6.5% methylcellulose solution) or an anaesthetic (0.011% NiSO_4 solution), the animal was deformed mechanically or stimulated by electric current, and the protoplasmic streaming was observed in detail. If part of the animal's body was constricted, streaming similar to normal cyclosis was observed on both sides of the constriction. This fact may indicate that the source of the motive force of cyclosis is not located at a definite part of the cell. A deformed Paramecium behaves so as to recover the normal form without exception. A strong contraction then takes place in a part of the cortical gel layer of the cell and a rapid streaming of protoplasm occurs towards the opposite side of the contracted part. Electrical stimulation of the Paramecium was carried out in a 5mM KCl solution (pH=7.2). When the strength of stimulus was relatively weak (current density about 0.07mA/mm^2), electrophoresis of granules was observed in the cytoplasm, the cytoplasmic granules moving to the anodal side of the cell. Using a stronger stimulus (current density more than about 0.14mA/mm^2), an anodal contraction was evoked. Immediately after this contraction, a rapid streaming of protoplasm occurs towards the cathodal side of the cell. a stream of this kind may result from a local intracellular pressure difference caused by the contraction of the cortical gel layer, and may occur in the normal condition. It is, therefore, thought that the complexity of the appearance of cyclosis in Paramecium is due to the intracellular structure, and also to the fact that a change in the intracellular pressure difference influences the direct motive force of the cyclosis. In view of the fact that cyclosis continued normally in Paramecium when effective ciliary movement was inhibited or disturbed, it is thought that cyclosis has no direct relation with locomotion or ciliary movement of the animal, but is biologically significant as an intracellular circulatory system. (Received October 19, 1963)
- 社団法人日本動物学会の論文
- 1964-02-15