The variation of electrical resistance with applied potential II. The collodion films
The variation of electrical resistance with applied potential II. The collodion films
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DOI：
10.1085/jgp.14.1.127
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发表时间：
1930-09-01
影响因子：
3.8
通讯作者：
Blinks, LR
中科院分区：
文献类型：
--
作者：
Blinks, LR
2.极薄的火棉胶膜对直流电的电阻与活细胞的电阻有一些相似之处，因为它随外加电位的不同而不同。当膜分离两种不同的溶液时，电阻随外加电位的方向(和电压)而变化，当较少的可移动离子通过膜时，电阻上升，而当较多可移动离子通过膜时，电阻下降。(对于某些膜，当两边都有相同的溶液时，阻力随电位而变化。)这些变化是非常迅速和有规律的。之前的电流流动存在滞后效应。但这种膜与瓦隆细胞的不同之处在于，电阻的上升很大程度上是欧姆的，几乎没有极化电位。3.在直流电穿过单层原生质膜的过程中，测量了被毛细血管穿透的胃橡皮草细胞的电阻和极化。这些都与原生质内自然存在的P.D.的5个阶段相关，并进行了详细的描述。
2. The resistance cf very thin collodion membranes to direct current bears some resemblance to that of living cells since it varies with the applied potential. With membranes separating 2 different solutions the resistance varies with the direction (and the voltage) of the applied potential, rising when less mobile ions are carried across the membrane and falling when more mobile ones are so carried. (With some membranes the resistance varies with potential when the same solution is on both sides.) These changes are very prompt and regular. There is a hysteretic effect of previous current flow. But the membranes differ from Valonia cells in that the rise of resistance is largely ohmic, there being little or no polarization potential. 3. Electrical resistance and polarization were measured during the passage of direct current across a single layer of protoplasm in the cells of Valonia ventricosa impaled upon capillaries. These were correlated with 5 stages of the P.D. existing naturally across the protoplasm, and described in detail.