摘要
Anopheles stephenst, infected with Plasinodium yoelii, was fed with 10% sucrose solution contatning 1% difluoromethylornithine (DFMO) to induce oocyst degeneration of the malaria parasites. On the 11th day after infection, the effects of mosquito hemocytes On the normal and degenerated oocysts were observed under transmission electron microscope. In the control group, no hemocyte could be found around the normally-developed oocysts. In the DFMO-treated group, all the oocysts underwent degeneration in various degrees and some of them were melanized. All the oocysts were attached by one or more hemocytes of the kind of granulocytes.There were many granules with microtubular structure in the cytoplasm of the hemocytes and in the space between the hemocyte and the oocyst. The findings suggest that the degeneration of oocysts can attract the hemocytes to attach around them and the latter can release granules and possibly other substances to cause encapsulation and melanization of the oocvsts.
