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- W1998096656 abstract "The gall midge Heteropeza pygmaea can reproduce by means of paedogenesis (i.e., larval parthenogenesis). In that process, follicles are produced that develop while floating in the hemocoele of the mother larva. A chorion is not formed at the end of oogenesis, and the growing embryos remain enveloped by the follicular epithelium. To investigate possible adaptations of the follicular epithelium to this unusual egg development, its ultrastructure has been studied during late oogenesis and cleavage. Earlier investigations had shown that the follicle cells are provided with a specifically arranged microtubular frame, which may be responsible for the anisometric growth of the egg. The present work shows that the follicle cells are always joined by desmosomes and septate junctions. During development, the septate junctions increase their surface and change their orientation to become parallel to the longitudinal egg axis, thus increasing the resistance of the follicle cells to being torn apart by growth tensions. The total surface of the follicular epithelium increases during development. Well-developed nucleoli in the nuclei and numerous ribosomes in the cytoplasm of follicle cells indicate a high level of synthetic activity. This activity may be required to support the increase in the membrane surface and the establishment of the microtubular frame. Lipid droplets, glycogen, and different inclusions in the follicle cells may represent nutrient and energy reserves. Structures indicating a quantitative significant transfer of nutrients from the follicle cells to the egg were not found." @default.
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- W1998096656 date "1983-12-01" @default.
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- W1998096656 title "The role of the follicular epithelium in growing eggs of a dipteran insect during late oogenesis and cleavage" @default.
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- W1998096656 doi "https://doi.org/10.1002/jmor.1051780307" @default.
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