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  • 1
    Electronic Resource
    Electronic Resource
    Development of the basal lamina and extracellular materials in the early chick embryo (1979)
    Springer
    Cell & tissue research 198 (1979), S. 527-537 
    Details
    ISSN: 1432-0878
    Keywords: Chick embryo ; Cell surface ; Basal lamina ; Extracellular materials ; Morphogenesis ; Tannic acid ; Glutaraldehyde fixation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Chick embryos at developmental stages up to primitive streak formation were fixed in a mixture of tannic acid and glutaraldehyde. A basal lamina was present in the unincubated embryo and consisted of a lucent lamina interna and a lamina densa. At the primitive streak stage the lamina densa showed a periodicity of stained elements. Densely stained materials were present on the cell surfaces lining the cavity between the epiblast and endoblast, and on the mesoderm cells within this cavity. Considerable amounts of extracellular material were observed in the cavity. Hyaluronidase treatment removed the cell surface and extracellular material, indicating that hyaluronic acid is a major component. This enzyme disrupted the basal lamina, leaving a fibrillar remnant with no periodic structure. It is therefore suggested that the dense periodicities consist of glycosaminoglycan built on an enzyme-resistant framework which is probably collagen. Enzyme-resistant fibrils, presumably collagen precursors, are present elsewhere within the tissue spaces.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00234196
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  • 2
    Electronic Resource
    Electronic Resource
    Ultrastructural cytochemical localization of adenylate cyclase in the early chick embryo (1987)
    Springer
    Cell & tissue research 247 (1987), S. 465-468 
    Details
    ISSN: 1432-0878
    Keywords: Adenylate cyclase ; Cytochemistry ; Gastrulation ; Ultrastructure ; Chick embryo
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Adenylate cyclase activity was localized in various tissues of the early chick embryo using an ultrastructural histochemical technique. Reaction product was deposited on the lateral plasma membrane of all cells, but with a preferential localization at the apical terminal complex in the epiblast. There was no activity associated with the free surfaces of these or other cells in the embryo. Intracellular deposits were found in all cells associated with the endoplasmic reticulum, nuclear envelope and Golgi bodies. In the last organelle, the deposit was sometimes observed to be distributed through the stack in a non-uniform way, with the heaviest deposits occurring at the forming face. No clear difference could be detected between the cytochemical activity associated with cells in various regions of the embryo, or with embryos at different stages of early development.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00218330
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  • 3
    Electronic Resource
    Electronic Resource
    Morphological differentiation of an embryonic epithelium in culture (1981)
    Springer
    Cell & tissue research 220 (1981), S. 539-548 
    Details
    ISSN: 1432-0878
    Keywords: Cultured epithelium ; Epiblast ; Chick embryo
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary This communication reports the results of a morphological study of three-day old cultures of epiblast tissue from the early chick embryo. The most striking feature of these cultures was the appearance of “domes” or elevated blister-like structures, composed of a single layer of cells which were morphologically distinct from the remaining cells in the culture. The domes arose in high-density areas of the culture. Their roofs were lined by basal laminae that did not develop in other areas of the culture. In several morphological respects, the cells of the dome roof closely resembled the epiblast in vivo. This was in contrast to the cells spread on the substratum in sparse regions of the culture, which did not. Each dome was surrounded by a dense ring of multilayered ruffling cells which appeared to give rise to both the dome roof and to fibroblast-like cells that spread on the substratum beneath the dome. Fibroblast-like cells also developed in discrete patches in other regions of the culture. In other tissues, dome formation has been attributed to fluid transport by the epithelium; in the present case it is also possible to invoke the capacity of the epiblast to fold, as contributing to the mechanism of dome formation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00216757
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  • 4
    Electronic Resource
    Electronic Resource
    Cell junctions in explanted tissues from early chick embryos (1981)
    Springer
    Cell & tissue research 221 (1981), S. 395-404 
    Details
    ISSN: 1432-0878
    Keywords: Intercellular junctions ; Chick embryo ; Tissue culture ; Hypoblast ; Endoblast
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Hypoblast and definitive endoblast derived from young chick embryos were explanted and grown for 24 h in culture. The junctional complexes which characterise these tissues were studied on freeze-fracture replicas and thin sections. Cell membranes of the hypoblast displayed tight junctions only, disposed in randomly arranged strands or narrow belts which included many discontinuous strands. The definitive endoblast showed tight and gap junctions as well as desmosomes in close association with the tight junctions. It is suggested that the differences between the two types of tissue may be related to cell cohesiveness, which appears to be relatively low in the hypoblast and high in the definitive endoblast.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00216743
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