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  • Action potential  (2)
  • Guinea pig  (2)
  • Pacemaker  (2)
  • Carbonic anhydrase  (1)
  • Chemistry  (1)
  • 1
    Electronic Resource
    Electronic Resource
    An experimental study on the isolated lateral semicircular canal of the bull frog (1986)
    Springer
    European archives of oto-rhino-laryngology and head & neck 243 (1986), S. 27-30 
    Details
    ISSN: 1434-4726
    Keywords: Bull frog ; Lateral semicircular canal ; Action potential ; Crista ; Time constant
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary We used isolated lateral semicircular canals from the bull frog, Rana catesbeiana. The cupula was removed from the crista and a glass micropipette was used to depress the sensory cilia on the crista toward the utricular side. Five points on the crista were selected for stimulation. Decremental time constants of the lateral ampullary nerve action potentials were measured. The longest time constant was obtained from stimulation to the wide portion of the crista. The time constant progressively decreased as the narrow side of the crista was approached. These results indicate that the lateral semicircular canal crista is equivalent to the halved posterior semicircular canal crista in terms of both morphology and physiology.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00457903
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Ultrastructural localization of carbonic anhydrase in the vestibular end organs of the guinea pig (1989)
    Springer
    European archives of oto-rhino-laryngology and head & neck 246 (1989), S. 56-60 
    Details
    ISSN: 1434-4726
    Keywords: Carbonic anhydrase ; Vestibular organ ; Guinea pig ; Histochemistry ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Carbonic anhydrase activity was demonstrated cytochemically on an ultrastructural level in the vestibular end organs of the guinea pig. Reaction product was found in the dark cells, transitional cells, cells of the planum semilunatum and supporting cells. In the dark cells, reaction product was observed in the cytoplasm as well as in the basal infoldings. Reaction product was also observed in the basal infoldings of the transitional cells and the cells of the planum semilunatum. The globular structures inside the supporting cells, transitional cells and the cells of the planum semilunatum were also surrounded by the reaction product. These findings suggest that carbonic anhydrase may have different functions, such as water and ion transport, respiration, nutrition and calcium carbonate deposition in the vestibular end organs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00454136
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Three-dimensional ultrastructure of the endolymphatic sac (1987)
    Springer
    European archives of oto-rhino-laryngology and head & neck 244 (1987), S. 117-122 
    Details
    ISSN: 1434-4726
    Keywords: Endolymphatic sac ; Guinea pig ; Scanning electron microscope ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The subcellular structures of the epithelial cells of the guinea pig endolymphatic sac were studied. By using a newly developed scanning electron microscopy technique, the intracellular organelles could be studied three-dimensionally and the topographic relationships analyzed. The light epithelial cell has an extensive network of endoplasmic reticulum which is characteristically arranged in a basoapical direction. The connections between the inner surface of the plasmalemma and the endoplasmic reticulum were observed, as were connections between the Golgi complex and the endoplasmic reticulum. Our findings support the hypothesis that the endoplasmic reticulum might form transcellular channels through which the cell can transport water and ions from the lumen of the endolymphatic sac out into the subepithelial tissue. The dark epithelial cells seen in particular contained the smooth type of endoplasmic reticulum. Lysosomes were also observed in the dark cells, indicating that these cells probably have more of a secretory function.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00458561
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    An experimental study demonstrating the physiological polarity of the frog's utricle (1987)
    Springer
    European archives of oto-rhino-laryngology and head & neck 244 (1987), S. 215-217 
    Details
    ISSN: 1434-4726
    Keywords: Action potential ; Utricular nerve ; Striola ; Cupula ; Physiological polarity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The frog Rana nigromaculata was used as an experimental model. The utricle and its nerve were isolated with the anterior and the lateral semicircular canal ampullae in frog Ringer's solution. The utricular otoconia and the otoconial membrane were then carefully removed. The halved anterior canal cupula was next placed in the tip of a glass microelectrode, which was mounted on a micromanipulator. The cupula was placed in the center of either the medial or the lateral part of the macula and was moved toward or away from the striola along the axis vertical to the striola. When the medial part of the macula was stimulated, 5 μm of striolapetal cupular movement elicited an excitatory nerve discharge. When the lateral part of the macula was stimulated, the striolapetal stimulus likewise induced an excitatory response. These results indicate the existence of physiological polarity on the utricular macula.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00455308
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    A heart-rate-responsive diaphragm pacemaker (1987)
    Springer
    Medical & biological engineering & computing 25 (1987), S. 458-462 
    Details
    ISSN: 1741-0444
    Keywords: Diaphragm pacing ; Exercise responsive ; Heart rate ; Microcomputer ; Pacemaker ; Stimulator ; Ventilation support
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02443369
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  • 6
    Electronic Resource
    Electronic Resource
    Addition to an RF-coupled phrenic nerve stimulator implant to provide outward transmission of body temperature (1986)
    Springer
    Medical & biological engineering & computing 24 (1986), S. 659-661 
    Details
    ISSN: 1741-0444
    Keywords: Diaphragm pacing ; Pacemaker ; RF ; Telemeter ; Temperature
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02446273
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Cyclic condensation product from 4,4′-dihydroxy-diphenylpropane and O-phthalic acid (1964)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Letters 2 (1964), S. 43-45 
    Details
    ISSN: 0449-2986
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1964.110020111
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    Paper (German National Licenses)
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