1. The discussion correlates the development in the vitelline cell with the effects in treatment.

2. The mature vitelline cells also degenerate; some vitelline droplets have fused.

3. The vitelline gland of female and testes of male worms were examined by transmission electron microscopy.

4. The cultured vitelline cells from adult Schistosoma japonica were observed ultrastructurally.

5. Immature vitelline cells have relatively little cytoplasm, many free ribosomes.

6. The sperm contacts with vitelline membrane by its radial arms of the nucleus, and undergoes acrosome reaction immediately.

7. Focal tegumental damage was observed among female worms with adherence of host leukocytes and degeneration of ovary and vitelline glands, as well as atrophy of testis in male worms.

8. Egg yolk cholesterol mainly come from yolk precursor-very low density lipoprotein(VLDL)and vitelline(VTG). The content of egg yolk cholesterol depends on the amount of VLDL transported into oocyte.

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9. In the cryostat section, the antigens also appeared at the fourth week, they were localized on vitelline membrane and egg shell.

10. Main detected the egg's moisture, salt content, viscosimet, and vitelline oiliness, vitelline exponential, vitelline coloring matter grade and so on.

11. The positive reaction for tyrosine, tryptophan and histidine was found in the subcuticular muscles, ovary, testes, vitelline cells and the intestinal epithelium.

12. Objective To study the effects of male worm extraction on the proliferation and metabolic activity of cultured vitelline cells from Schistosoma japonicum.

13. In the peripheral ooplasm there are many cortical specializations rods, which are perpendicular to the oolemma and located in the cortical crypt formed by the subsided vitelline envelope.

14. Oocyte in the coelom does not have follicle membrane and vitelline membrane is formed and developed by the oocyte itself.

15. Results In the test group, the numbers of mature vitelline cells were more than that in the control group; the cytoplasm and nucleus of mature vitelline cells were homogeneous stain.