直径对青蛙骨骼肌纤维电学常数的影响。
The effect of diameter on the electrical constants of frog skeletal muscle fibres.
作者信息
Hodgkin A L, Nakajima S
出版信息
J Physiol. 1972 Feb;221(1):105-20. doi: 10.1113/jphysiol.1972.sp009742.
Abstract
- Electrical constants were determined on isolated single fibres or on fibres from bundles from frog's twitch muscles by analysing the low frequency cable properties.2. The sarcoplasmic conductivity (G(i)) was 5.9 mmho/cm at 20 degrees C, and its temperature coefficient (Q(10)) was 1.37.3. The Q(10) of the membrane conductance (G(M)) was 1.49, and that of the membrane capacity (C(M)) was 1.02.4. C(M) increases with diameter (D) in an approximately linear manner: the values were 4.6 muF/cm(2) at D = 50 mu, and 8.5 muF/cm(2) at D = 130 mu.5. G(M) also increases with diameter, being 0.21 mmho/cm(2) at D = 50 mu and 0.37 mmho/cm(2) at D = 130 mu.6. These results suggest that the transverse tubular system contributes substantially to the values of low frequency capacity and conductance measured at the surface membrane.
摘要
通过分析低频电缆特性，在分离的单根纤维或青蛙抽动肌束的纤维上测定电学常数。
肌浆电导率（G(i)）在20℃时为5.9毫姆欧/厘米，其温度系数（Q(10)）为1.37。
膜电导（G(M)）的Q(10)为1.49，膜电容（C(M)）的Q(10)为1.02。
C(M)随直径（D）大致呈线性增加：在D = 50微米时为4.6微法/厘米²，在D = 130微米时为8.5微法/厘米²。
G(M)也随直径增加，在D = 50微米时为0.21毫姆欧/厘米²，在D = 130微米时为0.37毫姆欧/厘米²。
这些结果表明，横管系统对在表面膜处测得的低频电容和电导值有很大贡献。
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