蟹类肌肉纤维中的氯离子通量。
Chloride fluxes in crab muscle fibres.
作者信息
Richards C D
出版信息
J Physiol. 1969 May;202(1):211-21. doi: 10.1113/jphysiol.1969.sp008805.
Abstract
- Isotopic techniques were used to study the efflux of Cl(-) from single cannulated muscle fibres of the crab Maia squinado.2. The efflux of (36)Cl(-) was found to be exponential with steady rate constants ranging from 0.01 to 0.07 min(-1). The steady efflux was ca. 1000-2000 pM cm(-2) sec(-1). The efflux was slightly depressed by K(+)-free saline and was unaffected by 40 mM-K(+) saline and NO(3) (-) saline. The influx and efflux of Cl(-) were presumed independent.3. The membrane conductance calculated from (36)Cl(-) flux data was consistent with that determined by the method of electrotonic spread for other marine crustacean muscle fibres. Cl(-) accounted for most of the membrane conductance.
摘要
采用同位素技术研究了黄道蟹单根插管肌纤维中氯离子（Cl⁻）的外流情况。
发现³⁶Cl⁻的外流呈指数形式，稳定速率常数范围为0.01至0.07 min⁻¹。稳定外流约为1000 - 2000 pM cm⁻² sec⁻¹。无钾盐溶液会使外流略有降低，而40 mM钾盐溶液和硝酸盐（NO₃⁻）溶液对外流无影响。推测Cl⁻的内流和外流是相互独立的。
根据³⁶Cl⁻通量数据计算出的膜电导与通过电紧张传播方法测定的其他海洋甲壳类动物肌纤维的膜电导一致。Cl⁻占膜电导的大部分。
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