The relationship of extracellular Ca concentration and the fine structure of dark adapted photoreceptors in the crab (Eriocheir sinensis) was studied with electron microscopy.

• 用透射电镜研究了暗适应时中华绒螯蟹(Eriocheir sinensis)的光感受器超微结构与外界钙离子浓度的关系。