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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
    Superoxide dismutase, catalase, and glutathione peroxidase in the swim bladder of the physoclistous fish, Opsanus tau L (1981)
    Springer
    Cell & tissue research 220 (1981), S. 739-752 
    Details
    ISSN: 1432-0878
    Keywords: Superoxide dismutase ; Catalase ; Glutathione peroxidase ; Swim bladder ; Opsanus tau
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The antioxidant enzymes superoxide dismutase, glutathione peroxidase, and catalase were measured in the rete mirabile and gas gland epithelium area of the swim bladder of the toadfish Opsanus tau. When the concentration of enzyme in the swim bladder was compared with the concentration in other organs (kidney, heart, gills) of the same fish, the swim bladder was found to have the highest concentration of superoxide dismutase but relatively low levels of glutathione peroxidase and catalase. Cytochemical assay for the peroxidatic activity of catalase confirmed that virtually no catalase is present in epithelial cells of the gas gland. A similar assay for peroxidase revealed a cyanide-sensitive peroxidase in the multilamellar bodies of these cells. Most of the catalase and peroxidase in the rete mirabile appears to be confined to the granules of neutrophils and the cytoplasm of erythrocytes. Enzyme activity in the neutrophils is not inhibited by 10-1 M KCN. Cyanide does appear to inhibit the peroxidase activity in erythrocytes but has little effect on catalase in these cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00210458
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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