非洲爪蟾侧线壶腹内钙离子浓度的测量。

Measurement of calcium ion concentrations in the lateral line cupulae of Xenopus laevis.

McGlone F P, Russell I J, Sand O

J Exp Biol. 1979 Dec;83:123-30. doi: 10.1242/jeb.83.1.123.

Abstract

Ion selective microelectrodes were used to measure the distribution of Ca2+ in the cupulae of Xenopus laevis, and to observe the effects of the Ca2+ blocker, La3+, and a Ca2+ chelating agent (EGTA) on the endocupular potential and K+ concentration. 2. Measurements of the endocupular Ca2+ and potential were found to be in the range of 2-30 muM and 55-10 mV respectively, and their relationship indicates that Ca2+ is passively distributed in the cupula. 3. The concentration of endocupular K+ and endocupular potential was found not to be influenced by addition of either 1 mM EGTA or 100 muM-La3+ to the bathing solution.

摘要

使用离子选择性微电极测量非洲爪蟾壶腹嵴中Ca2+的分布，并观察Ca2+阻滞剂La3+和Ca2+螯合剂（乙二醇双四乙酸）对内壶腹电位和K+浓度的影响。2. 发现内壶腹Ca2+和电位的测量值分别在2 - 30 μM和55 - 10 mV范围内，它们之间的关系表明Ca2+在壶腹嵴中是被动分布的。3. 发现向浴液中添加1 mM乙二醇双四乙酸或100 μM-La3+不会影响内壶腹K+浓度和内壶腹电位。