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  • Title: [A study of passive Ca2+ flow through the sarcoplasmic reticulum of skeletal muscles. II. Stimulation of passive Ca2+ influx with monovalent cations and anions].
    Author: Diadiusha GN, Tugaĭ VA, Zemlianaia NN, Zakharchenko AN.
    Journal: Ukr Biokhim Zh (1978); 1989; 61(2):80-5. PubMed ID: 2543109.
    Abstract:
    The initial rate of passive Ca2+ influx into "heavy" and "light" fractions of sarcoplasmic reticulum (SR) vesicles increases in the presence of univalent cation chlorides. Stimulation of passive Ca2+ influx decreases in the following order: KCl + valinomycin-KSCN- + valinomycin greater than KSI = NaCl greater than choline chloride. K-gluconate + valinomycin and K-gluconate have no effect on the passive Ca2+ influx into SR vesicles. It is supposed that KCl-stimulation of passive Ca2+ influx into SR vesicles under conditions used may be caused by depolarization of the SR membrane.
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