Effect of divalent cations on the loss in contractility of the glycerinated stalks of Vorticella in high KC1 solutions

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Abstract 1. 1. The spasmoneme in glycerinated stalks of Vorticella lost its contractility partially or completely upon treatment with high concentration of KCL. 2. 2. The concentration of Ca2+ required for partial recontraction of the treated stalks at physiological ionic strength was independent of the KCL concentration used for treatment. 3. 3. The loss in contractility of the spasmoneme was significantly suppressed if free Ca2+ or other divalent cations were present in the KCL treatment solution. The suppressive effect was in the order Ca2+ > Mg2+ > Sr2+ > Ba2+ (no effect). 4. 4. The above results suggest that there is a second binding site for divalent cations different from that for the spasmoneme contraction.

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