Koike H, Brown H M, Hagiwara S
J Gen Physiol. 1971 Jun;57(6):723-37. doi: 10.1085/jgp.57.6.723.
Membrane potential changes following illumination of a photoreceptor cell in the lateral ocellus of a barnacle (Balanus eburneus) were studied by means of intracellular recording and polarization techniques. Illumination produces a depolarizing response. When the illumination is terminated, the membrane potential temporarily becomes more negative than the resting potential prior to illumination. Although the amplitude of this postillumination hyperpolarization depends upon the intensity as well as the duration of the light pulse, the time course is fairly constant. The hyperpolarization is not associated with any significant membrane conductance increase and is abolished by 10(-5)M ouabain. It diminishes when the external Na or K ions are removed. An intracellular injection of Na ions produces a hyperpolarization similar to that following illumination. It is suggested that the postillumination hyperpolarization is produced by an electrogenic Na pump which is activated by the Na influx during illumination.
利用细胞内记录和极化技术，研究了藤壶（Balanus eburneus）侧单眼感光细胞受光照后的膜电位变化。光照产生去极化反应。当光照终止时，膜电位暂时变得比光照前的静息电位更负。尽管这种光照后超极化的幅度取决于光脉冲的强度和持续时间，但其时间进程相当恒定。这种超极化与任何显著的膜电导增加无关，并且被10(-5)M哇巴因消除。当去除细胞外的Na或K离子时，超极化减弱。细胞内注入Na离子会产生类似于光照后的超极化。有人提出，光照后超极化是由一种生电Na泵产生的，该泵在光照期间由Na内流激活。
