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  • 1
    Electronic Resource
    Electronic Resource
    Excystment of Metacercariæ of Fasciola hepatica L. in vitro (1964)
    [s.l.] : Nature Publishing Group
    Nature 202 (1964), S. 1240-1241 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In the experiments reported here, metacercariae of Fasciola hepatica L. obtained from naturally and experimentally infected Lymnaea tomentosa (Pfeiffer) and stored on 'Cellophane5 at 4 C were used. It was found that removal of the outer fibrous cyst membrane by careful dissection from the inner ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/2021240b0
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Effects of retinoic acid on the endoderm in Xenopus embryos (1998)
    Springer
    Development genes and evolution 208 (1998), S. 318-326 
    Details
    ISSN: 1432-041X
    Keywords: Key words Retinoic acid ; Endoderm ; Lateral plate mesoderm ; Specification ; Xenopus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  When Xenopus embryos from mid-tailbud to early tadpole stages were exposed to retinoic acid (RA), the gut developed with an uncoiled, straight intestinal tube, morphogenesis of the liver and stomach was affected and intestinal epithelial cells developed without a brush border and alkaline phosphatase activity. However, the temporal and spatial expression pattern of XlHbox 8, the only homeobox gene expressed in the endoderm was unaffected. In lateral plate mesodermal cells the expression of α-smooth muscle (SM) actin was delayed. A similar syndrome has been reported in a study of embryos lacking functional FGF receptors in which it was proposed that the uncoiled intestinal tube and the delayed differentiation of the intestinal muscle cells are causally related. Our results support this proposition and further suggest that mesenchymal-epithelial interactions concerned with regional specification of the endoderm may be impaired resulting in other defects in the gut.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004270050187
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    A light and electron microscopical study of spermatogenesis in Hydra cauliculata (1972)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 137 (1972), S. 483-501 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Morphological changes in the interstitial cells were studied during their differentiation into spermatozoa. Development of the spermatogonium involves an increase in nuclear and nucleolar size, and the formation of a dense mass of cytoplasmic ribosomes. The mature spermatozoon has a relatively simple structure. The head consists of a bullet shaped, homogeneous nucleus, which lacks an acrosome but bears distal membrane specializations. The middle piece is composed of four large spherical mitochondria at the base of nucleus. A single flagellum projects from one of the two centrioles lodged between the mitochondria. The flagellum appears early during development in the primary spermatocyte. During spermiogenesis microtubules associated with the basal body flagellum complex appear to define the axis of chromatin condensation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051370407
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    Paper (German National Licenses)
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