Xu L W, Yang X L
Shanghai Institute of Physiology, Chinese Academy of Sciences.
Sheng Li Xue Bao. 1991 Aug;43(4):311-21.
It was previously reported that changes in sensitivities of electroretinographic b-wave in the course of light adaptation depended on the intensity of background lights. B-wave sensitivity decreased with time by dimmer background lights, while it recovered during illumination with background lights of higher intensities. In this work we examined light adaptation properties of glutamate-isolated receptor potentials (P III components), using isolated and superfused cyprinid retinas. During dimmer background illumination, P III components were unchanged. When background lights were increased above certain levels, P III components showed partial recovery with time in the light. A detailed analysis of spectral sensitivities of P III components and their increment thresholds for several wavelengths indicated that the recovery of P III sensitivity appeared with background lights at which rod function was taken over by cone function. The results suggest that the recovery of b-wave sensitivity during brighter background illumination is partially a reflection of the adaptation property of cone photoreceptors.
先前有报道称，在光适应过程中视网膜电图b波敏感性的变化取决于背景光的强度。背景光较暗时，b波敏感性随时间降低，而在强度较高的背景光照射期间则会恢复。在这项研究中，我们使用分离并灌注的鲤科鱼类视网膜，研究了谷氨酸分离的感受器电位（P III成分）的光适应特性。在较暗的背景光照下，P III成分保持不变。当背景光增加到一定水平以上时，P III成分在光照下随时间出现部分恢复。对P III成分的光谱敏感性及其对几种波长的增量阈值进行详细分析表明，P III敏感性的恢复出现在视杆功能被视锥功能取代的背景光条件下。结果表明，在较亮的背景光照期间b波敏感性的恢复部分反映了视锥光感受器的适应特性。
