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- W1756095270 abstract "ABSTRACT Embryonic development in B. nanum is similar to that of Littorina obtusa, apart from differences, especially in the velum and foot, which can be correlated with the planktonic mode of life of the veliger of B. nanum. Electron microscope studies of oogenesis show that fatty yolk formation occurs in association with the vitelline body and with mitochondria, and proteid yolk formation occurs in association with the Golgi apparatus. Nucleo-cytoplas-mic relationships in the growing oocyte are discussed. During oogenesis, cytochemical localizations can be related to the nucleolar activity, elaboration of the endoplasmic reticular elements and the presence of yolk. No preferential distribution of the substances tested occurs in the cytoplasm of the late oocyte. Following fertilization, slight animal-vegetal and radial gradients are established, chiefly in association with the yolk. During cleavage, a definite animal-vegetal gradient is seen in the pattern of cytochemical localizations, but the differences between the cells are only relative, no rigid localizations in one cell or group of cells occurring. During gastrulation, the chemo-differentiation detectable in early embryonic development is well established. The cells of the ectoderm, endoderm and mesoderm are each cytochemically distinct, but no absolute distinctions between each cell type can be shown. During organogenesis, the initial differentiation of both larval and adult cells is accompanied by strongly positive reactions for DNA, RNA and alkaline phosphatase in these cells. Following this initial differentiation, two distinct cell types emerge : (i) Functional larval cells (both ectodermal and endodermal) involved in nutrition and locomotion, showing slight reactions for RNA, DNA and alkaline phosphatase (except where these are involved in cell function) and highly positive reactions for iron, glycogen and PAS-positive material. (ii) Adult rudiment cells, which may be functional in the larva, but are still differentiating towards the adult type and remain strongly positive for DNA, RNA and alkaline phosphatase." @default.
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- W1756095270 date "1966-02-01" @default.
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- W1756095270 title "The electron microscopy and cytochemistry of oogenesis and the cytochemistry of embryonic development of the prosobranch gastropod <i>Bembicium nanum</i> L." @default.
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- W1756095270 doi "https://doi.org/10.1242/dev.15.1.15" @default.
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