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- W2023851858 abstract "Abstract The resorption processes of the extra-embryonic epithelia in the egg of the African migratory locust, Locusta migratoria migratorioides R. and F., have been analyzed at the cellular level, more particularly for the gigantic serosal cells. While definitive dorsal closure is taking place, those flattened epithelia retract and become cuboidal. Then their cells show typical alterations : cytoplasmic and nuclear volumes change; cytoplasmic components segregate; vaculoes, lipidic inclusions and glycogen granules appear in the cytoplasm; chromatin becomes pycnotic and gains a RNase-resistant affinity for pyronin. The process of dissociation of extra-embryonic membranes varies according to the nature of the epithelium considered, and to its position in relation to the embryo. Once they have been incorporated, the cells degenerate through autolysis. Most of them are phagocytized (heterolysis) either by hemocytes (post-oral amnion) or by vitellophages in the dorsal complex of resorption (serosa). At first, the post-mortem changes in serosal cells begin with the intense condensation of cytoplasmic ribonucleoproteins and the swelling of mitochondria; then comes the lysis of those cytoplasmic components, of the nuclear membrane and of the pycnotic chromatin. In the cytoplasm of vitellophagocytes, residual bodies are still visible 24 hr before hatching. The movements of the vitellophages have been followed: in the anterior part of the yolk, they perform a centripetal migration towards the serosal cells which have been incorporated. Later they move towards the periphery, and so could play a part in the formation of the definitive midgut epithelium." @default.
- W2023851858 created "2016-06-24" @default.
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- W2023851858 date "1976-01-01" @default.
- W2023851858 modified "2023-09-27" @default.
- W2023851858 title "Involution des annexes embryonnaires dans l'oeuf de Locusta migratoria migratorioides R. et F. (Orthoptera : Acrididae) : Analyse cytologique" @default.
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- W2023851858 doi "https://doi.org/10.1016/0020-7322(76)90002-7" @default.
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