Download The Embryonic Development of Drosophila melanogaster by Prof. Dr. José A. Campos-Ortega, Prof. Dr. Volker PDF

By Prof. Dr. José A. Campos-Ortega, Prof. Dr. Volker Hartenstein (auth.)

" . . . yet our wisdom is so susceptible that no thinker will ever be ready to thoroughly discover the character of even a fly . . . " * Thomas Aquinas "In Symbolum Apostolorum" 079 RSV p/96 it is a monograph on embryogenesis of the fruit fly Drosophila melanogaster, conceived as a reference ebook at the morphology of embryonic improvement. A monograph of this quantity and content material isn't really but on hand within the literature on Drosophila embryology, and we think that there's a actual want for it. because of the professional­ gress completed over the last ten years within the fields of strengthen­ psychological and molecular genetics, paintings on Drosophila improvement has expanQ. ed significantly, developing an excellent better want for the knowledge that we current right here. Our personal curiosity in embryonic improvement of the wild kind arose a number of years in the past, after we started to research the advance of mutants. during those reviews we many times had celebration to find gaps and inade­ quacies within the latest literature at the embryology of the wild sort, in order that we undertook to enquire lots of those difficulties ourselves. confident that a lot of our colleagues may have encountered comparable problems, we made up our minds to post the current monograph. even supposing now not explicitly recorded, Thomas Aquinas used to be proba­ bly relating the family fly and never to the fruit fly. Irrespec­ tive of which fly he intended, in spite of the fact that, we all know that Thomas was once right.

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Additional resources for The Embryonic Development of Drosophila melanogaster

Example text

The arrangement of neuroblasts (nb) in rows immediately beneath the ectoderm (ec) can be seen in A. The two sides are symmetrically organized, being separated by the mesectodermal cells (me). B shows periodic bulges in the lateral epidermis (arrows) of abdominal segments, between the tracheal placodes. Proctodeum (pr) and posterior midgut (pm) are well established. Evaginations of the proctodeal wall to form the primordium of the Malpighian tubules (mt) can be seen in D. am anterior midgut; as amnioserosa; cf cephalic furrow; vc procephalic lobe; st stomodeum.

6). During cellularization, as the furrows progress inwards, a few pole cells can be seen to interdigitate between blastoderm cells. At the end of cellularization these pole cells have become completely internalized, lying below the posterior blastoderm cells and clearly separated from the yolk sac (Counce 1963; Underwood et al. 1980a). e. the anlage of the posterior midgut, in their movements at germ band elongation, eventually becoming included in the midgut lumen in stage 13. Stage 6 a) Living embryos.

These mitotic waves usually originate at two different sites, one near the anterior and the other near the posterior egg pole and move centripetally. 25 Stage 5 a) Living ~aterial. Corresponds to stage s of Bownes (197S). During this stage blastoderm cell formation takes place (Fig. 1, S Sb), while blastoderm nuclei elongate considerably (2:1O-2:S0 h). This process can easily be followed in the living embryo because of the readily discernible, progressive, inward displacement of cell membranes.

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