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  • 1
    Electronic Resource
    Electronic Resource
    The ultrastructure of the swimbladder of the toadfish, Opsanus tau L. (1975)
    Springer
    Cell & tissue research 164 (1975), S. 85-104 
    Details
    ISSN: 1432-0878
    Keywords: Swimbladder ; Opsanus tau ; Physoclist ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The anterior chamber of the swimbladder of the toadfish Opsanus tau L. is lined by a single layer of columnar gas gland cells, cuboidal cells that resemble gas gland cells but are located outside of the gas gland region, and squamous cells. Multilamellar bodies are numerous in the gas gland cells and the cuboidal cells and are present in smaller numbers in the squamous cells. Capillaries lie in the lamina propria directly below the epithelial lining. A thick continuous muscularis mucosae and a submucosa consisting of tightly packed cells, cell processes, and connective tissue may contribute to the impermeability to gases of the wall of the anterior chamber. The posterior chamber of the swimbladder is lined by a single type of squamous epithelial cell. Multilamellar bodies were occasionally observed in these cells also. Other types of cells frequently form a partial second layer between the epithelial lining and the basement lamina. A thin muscularis mucosae lies directly below the basement lamina and the capillaries of the posterior chamber are located in the submucosa. The tunica externa is a layer of dense connective tissue that surrounds both the anterior and posterior chambers. Collagen fibrils in the form of tactoids are present in this layer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00221697
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Ultrastructural immunocytochemical localization of fibronectin in the developing rat lung (1983)
    Springer
    Cell & tissue research 234 (1983), S. 165-177 
    Details
    ISSN: 1432-0878
    Keywords: Fibronectin ; Lung ; Development ; Ultrastructure ; Immunocytochemistry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary In a previous study changes in the macrodistribution of fibronectin during rat-lung development were examined. Using the peroxidase-antiperoxidase immunocytochemical technique, we have demonstrated the presence of fibronectin in embryonic, neonatal, and adult rat lung at the ultrastructural level. In the embryo, fibronectin is found both in an intra-and extracellular association with isolated pneumoblasts, and in a periodic distribution along the basal lamina. The neonate displays fibronectin in an intracellular association with early type-I cells and on their basal and luminal surfaces, but not in association with type-II cells. Neonatal basal lamina is diffusely labeled by anti-fibronectin antiserum. Fibronectin in adult tissue is found both intracellularly and on the basal and luminal surfaces of type-I cells but not in type-II cells. The basal lamina and interstitial connective tissue are slightly or non-reactive. These observations confirm and extend our initial suggestion that fibronectin is involved in rat-lung development.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00217410
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Ultrastructure of the swim bladder of the goldfish, Carassius auratus (1979)
    Springer
    Cell & tissue research 198 (1979), S. 105-117 
    Details
    ISSN: 1432-0878
    Keywords: Swim bladder ; Physostome ; Cyprinid ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The swim bladder of the cyprinid Carassius auratus (goldfish) is a two-chambered organ connected to the esophagus by a pneumatic duct. The anterior chamber is lined by a single type of squamous epithelial cell. Two types of epithelial cells are present in the posterior chamber. Flattened cells with differences in the electron density of the cytoplasm line most of the chamber. Darker cells generally contain large amounts of glycogen. Cuboidal epithelial cells also occur in the posterior chamber. A glandular layer external to the muscularis in the posterior chamber is composed of large cells containing little glycogen, an extensive Golgi apparatus, and numerous mitochondria with single large granules. Capillaries and nerves are present in large numbers in this layer. Blood vessels form micro-retia mirabilia in the submuscular layer external to the glandular layer. Vessels are of two distinct types with wide lumina and flattened endothelium characterizing the venous vessels. Arterial vessels have smaller lumina, thick endothelial cells with prominent pinocytotic vesicles, and surrounding pericytes. Collagen is present in three forms in this swim bladder — large tactoids in the tunica externa of the anterior chamber, smaller tactoids in the lamina propria of the posterior chamber, and small fibrils in all other areas.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00234838
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Cytochemical study of the lamellar bodies in the swimbladder of the toadfish Opsanus tau L. (1977)
    Springer
    Cell & tissue research 185 (1977), S. 77-87 
    Details
    ISSN: 1432-0878
    Keywords: Swimbladder (Toadfish) ; Lamellar bodies ; Cytochemistry ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The columnar epithelial cells of the gas gland in the swimbladder of the toadfish, Opsanus tau L., contain lamellar bodies that resemble the lamellar bodies found in epithelial cells of vertebrate lungs. Cytochemical assays indicate that swimbladder lamellar bodies are soluble in chloroform-methanol solution, react with tricomplex flocculation solution (indicating a phospholipid component), exhibit a positive reaction for cholesterol when exposed to digitonin, and contain acid phosphatase. The anterior chamber of the toadfish swimbladder is lined by an extracellular layer. Digitonin-cholesterol crystals are found in this layer when the swimbladder is treated with digitonin. A ruthenium red positive layer is also present in the anterior chamber of the toadfish swimbladder. The structure and cytochemistry of swimbladder lamellar bodies are compared with those of vertebrate lung lamellar bodies. Similarities between the extracellular layer in the swimbladder and the extracellular layer in lungs are also noted.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00226670
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    Paper (German National Licenses)
    Fulltext
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