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前言目前有关环鸟苷酸(cGMP)的生理机能还不清楚,然而视网膜内视杆细胞外段,是cGMP系统比cAMP系统占优势的结构。有关视杆细胞外段电生理学的知识非常丰富,视色素的物理化学性质的研究亦取得了很大进展,人们认为视细胞是非常适合于研究cGMP的材料.以青蛙的视网膜为例,视杆细胞外段长约50μm、宽6μm的园筒形状,在其中有
Foreword At present, the physiological function of cyclic guanosine monophosphate (cGMP) is unclear. However, the outer segment of the rod in the retina is the predominant structure of the cGMP system over the cAMP system. There is a great deal of knowledge about electrophysiology of rod extracellular segments and considerable progress has been made in the study of the physicochemical properties of the pigment. It is believed that the optic cell is a very suitable material for studying cGMP. Taking the frog’s retina as an example, The extracellular segment was about 50 μm long and 6 μm wide in cylindrical shape, among them