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  • 1
    Electronic Resource
    Electronic Resource
    RNA binding and translational suppression by bicoid (1996)
    [s.l.] : Nature Publishing Group
    Nature 379 (1996), S. 746-749 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Maternal cad mRNA is evenly distributed in the early cleavage-stage embryo (Fig. la), and cad forms a posterior-to-anterior concentration gradient before the initiation of zygotic gene expression67 (Fig. Ib, d). In the absence of functional bed expression (Fig. Ic, d), cad remains evenly ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/379746a0
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Analysis of neural elements in head-mutant Drosophila embryos suggests segmental origin of the optic lobes (1995)
    Springer
    Development genes and evolution 205 (1995), S. 31-44 
    Details
    ISSN: 1432-041X
    Keywords: Drosophila ; Head development ; Segmentation mutants ; Nervous system ; Optic lobe
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We describe the development of 20 sensory organs in the embryonic Drosophila head, which give rise to 7 sensory nerves of the peripheral nervous system (PNS), and 4 ganglia of the stomatogastric nervous system (SNS). Using these neural elements and the optic lobes as well as expression domains of the segment polarity gene engrailed in the wild-type head of Drosophila embryos as markers we examined the phenotype of different mutants which lack various and distinct portions of the embryonic head. In the mutants, distinct neural elements and engrailed expression domains, serving as segmental markers, are deleted. These mutants also affect the optic lobes to various degrees. Our results suggest that the optic lobes are of segmental origin and that they derive from the ocular segment anteriorly adjacent to the antennal segment of the developing head.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00188841
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Expression of engrailed in embryos of a beetle and five dipteran species with special reference to the terminal regions (1994)
    Springer
    Development genes and evolution 203 (1994), S. 298-303 
    Details
    ISSN: 1432-041X
    Keywords: Insects ; Diptera ; Tribolium ; engrailed ; Embryogenesis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The engrailed expression in embryos of a beetle, four midges and a fly has been analysed with special reference to the terminal regions. In all six species the segmental expression pattern is very similar but variability occurs in the clypeolabrum, foregut and hindgut. In some cases, segmental engrailed expression seems to be extended into the hind- and/or foregut. The engrailed expression of these species is compared with published data from other insects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00457800
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Fate-mapping in the procephalic region of the embryonic Drosopbila head (1994)
    Springer
    Development genes and evolution 203 (1994), S. 367-373 
    Details
    ISSN: 1432-041X
    Keywords: Drosophila ; Embryogenesis ; Morphogenetic movements ; Brain ; HRP
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Using intracellular horseradish peroxidase injection we traced the developmental fate of early gastrula cells of the procephalic region in the stage 16/17 embryo. Morphogenetic movements in the developing brain are described in three dimensions. The results are related to head segmentation, and an early gastrula fate map of pregnathal head segments is proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00188684
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  • 5
    Electronic Resource
    Electronic Resource
    The amnioserosa is an apomorphic character of cyclorrhaphan flies (2000)
    Springer
    Development genes and evolution 210 (2000), S. 373-376 
    Details
    ISSN: 1432-041X
    Keywords: Key words Embryogenesis ; Amnion ; Serosa ; Diptera ; Orthorrhapha
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  In developing insect eggs the cells of the blastoderm adopt either an embryonic or an extraembryonic fate. The extraembryonic tissue consists of epithelia, termed amnion and serosa, which wrap the germ band embryo. The serosa develops directly from part of the blastoderm and surrounds the embryo as well as the yolk. The amnion develops from the margins of the germ band and in most insect species generates a transient ventral cavity for the developing embryo. The amniotic cavity and the serosa have been reduced in the course of dipteran evolution. The insect order of Diptera includes the paraphyletic Nematocera, including gnats and mosquitoes, and the more derived monophyletic Brachycera, the true flies. Nematocera develop within an amniotic cavity and the surrounding serosa, whereas cyclorrhaphan Brachycera do not. This observation implies that the amnion and serosa have been reduced before the radiation of the monophyletic cyclorrhaphan flies. Here I show that an amniotic cavity is formed during embryogenesis of the horsefly Haematopota pluvialis (Tabanidae) and the dancefly Empis livida (Empididae). The results suggest that extraembryonic tissue was reduced in the stem lineage of cyclorrhaphan flies, with consequences for the molecular basis of pattern formation along the anterior-posterior axis of the embryo.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004270000068
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    Paper (German National Licenses)
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