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- W2389249521 abstract "Changes of ultrastructure of oocytes during oogenesis and the origin of vitellogenesis in Panulirus stimpsoni were studied with transmission electron microscope. The results showed that the oogonium was simple in structure with undeveloped organelles. Marked changes occurred in oocytes at pre-vitellogenesis and early vitellogenesis stages, which presented as concavo-convex nuclear membrane and various well-developed organelles emerging in cytoplasm. Active endogenous yolk formation mainly occurred in metaphase of vitellogenesis and many kinds of organelles participated. Vesicular rough endoplasmic reticulum and mitochondria were the dominant organelles which took part in the endogenous yolk formation. Plenty of free ribosomes formed yolk granules by direct and indirect ways. Lysosomes produced yolk granules by multivescular and medullary ways. And golgi apparatus parted many small vesicles by budding to form yolk granules. There were plentiful yolk granules with different electronic density in the vitellogenic oocytes of anaphase. Meanwhile active microphagocytosis of plasma membrane could be seen to form exogenous yolk. Mature oocytes were full of big yolk granules with high electronic density and their number of organelles reduced quickly. The paper discussed the relationship between changes of the structure in oocytes and vitellogenesis.The function of organelles in vitellogenesis was also discussed." @default.
- W2389249521 created "2016-06-24" @default.
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- W2389249521 date "2009-01-01" @default.
- W2389249521 modified "2023-09-26" @default.
- W2389249521 title "Ultrastructural observation of oogenesis and vitellogenesis of Panulirus stimpsoni" @default.
- W2389249521 hasPublicationYear "2009" @default.
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