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  • 1995-1999  (3)
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Material
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  • 1
    Electronic Resource
    Electronic Resource
    InducciÓn Experimental á Malformaciones por Instilacion de Etanol en Huevos Embrionados de Polio (Gallus gallus) (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Anatomia, histologia, embryologia 24 (1995), S. 0 
    Details
    ISSN: 1439-0264
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The teratogenic effect of alcohol on chick embryos has been confirmed by many investigators. However, how this occurs is unknown.The aim of this study was to establish a teratogenic pattern of alcohol effects, on the first stages of development in avians.Fertilized eggs were infused through the air space of the shell on day 0, with ethanol in concentrations of 20%, 40% and 60%. The control group was infused with 0.1 ml of NaCl at 0.9%. At a second stage, the eggs were treated on the 4th day of incubation, using the same method. In both groups the eggs were removed on the 11th day of incubation.The teratological manifestations that appeared more frequently were evisceration, haemorrhagic embryos, oedema, cranial deformities, lack of eyes, and umbilical hernia, showing every embryo a clear reduction in size and body weight.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1439-0264.1995.tb00038.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Scanning-Electron Microscopy of the Development of the Head of Rainbow-trout (Oncorhynchus mykiss) Embryos (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Anatomia, histologia, embryologia 24 (1995), S. 0 
    Details
    ISSN: 1439-0264
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The development of the cephalic region of rainbow trout in the 24th, 30th and 36th stages, corresponding to the table of development by Vernier (1969), was studied using light microscopy and SEM.The 24th stage shows a voluminous cephalic region as a principal feature. At this time, most components of this region have started their differentiation. The 30th stage can be considered as an intermediary phase in the embryonic formation, and it is characterized by the high degree of differentiation between the nervous system and the sense organs. In the 36th stage, the basic final shape of the embryo has been reached.The results of this study show that the differentiation of gill lamellae and the opening of the mouth takes place later than that moment described by other authors. This suggests that development between 30th and 36th stages is a critical survival period for rainbow trout, in which respiratory and digestive functions start.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1439-0264.1995.tb00045.x
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Hatching Gland Cells of Trout Embryos as the Target of Positional Information (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Anatomia, histologia, embryologia 25 (1996), S. 0 
    Details
    ISSN: 1439-0264
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: HGCs were found in the head epidermis, yolk sac and pharynx epithelium of trout embryos. These cells usually appear in clusters, closely related positionally to neighbouring cells. The differentiation and specialization of HGCs seem to be mainly dependent on cell-cell interactions, which provides, in part, the positional information necessary for the cells to differentiate and localize in the appropriate place. The final secretory process is the result of a sequence of events by which the maturation of enzymatic granules occurs. The electron-density of the granules varies according to the proximity of the secretory stage. Exocytosis of the secretory granules were observed. After secretion, each HGC undergoes cellular death by apoptosis (programmed cell death).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1439-0264.1996.tb00096.x
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    Paper (German National Licenses)
    Fulltext
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