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- W2029596407 abstract "Protoplasmic droplet isolated from Nitella became electrically excitable in appropriate salt solutions. Specific interactions among molecules constituting the surface membrane and ions in the surrounding media are responsible for the characteristic feature of the excitable membrane. Here, the roles of Ca2+, phospholipids, and proteins for maintaining the excitability of the droplets were examined by modifying the surface membrane by means of various inorganic cations. The following results were obtained: 1.1. Sr2+ could substitute for Ca2+ in the external solution without loss of excitability. However, the membrane was in the resting state of about −50 mV in the membrane potential in media where the Sr2+ concentration was higher than 3 mM, whereas Ca2+ maintained the excitable membrane structure with about −100 mV in the resting potential in the concentration range between 0.1 and 10 mM.2.2. The following order was found for the critical salt concentration at which an abrupt depolarization of the membrane potential was induced, when the following cations were added to the test solution; UO22+ < Eu3+ < Nd3+ < Ca2+. Tension at the surface of the droplet increased remarkably with an increase of the concentration of the respective ion species.3.3. The action of Hg2+, Cd2+ and Ag+ gave rise to a temporal increase of the membrane resistance, and a decrease of tension at the surface. Then followed a depolarization of the membrane potential at the concentration as low as 10−6−10−5 M.4.4. Cu2+ acted on the membrane with a decrease in the membrane resistance and the tension at the surface, and followed by a depolarization of the membrane potential at about 10−5 M." @default.
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- W2029596407 date "1974-12-01" @default.
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- W2029596407 title "Roles of Ca2+, phospholipids and proteins in the excitable membrane of protoplasmic droplet isolated from Nitella" @default.
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- W2029596407 doi "https://doi.org/10.1016/0005-2736(74)90152-7" @default.
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