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  • 1
    Electronic Resource
    Electronic Resource
    Acoustic trauma effects with varying exposure times (1981)
    Springer
    European archives of oto-rhino-laryngology and head & neck 230 (1981), S. 265-271 
    Details
    ISSN: 1434-4726
    Keywords: Guinea pig ; Acoustic trauma ; 20 kHz ; Short exposure times
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Guinea pigs have been exposed to 20 kHz for 2 h, 1 h, 30 min, 15 min, or 7.5 min, and the resultant damage was observed 3, 6, and 12 weeks post exposure. The areas of outer hair cell damage were statistically compared. Significant differences were obtained after a 3-week survival time with the shorter exposure times, but this difference was no longer apparent after 12 weeks. Myelinated nerve fibre and inner hair cell damage occurred only with total outer hair cell loss.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00456328
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The effects of short noise exposures in the guinea pig (1984)
    Springer
    European archives of oto-rhino-laryngology and head & neck 240 (1984), S. 107-114 
    Details
    ISSN: 1434-4726
    Keywords: Guinea pig ; 20 kHz ; Short exposures ; Cochlear damage
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Guinea pigs have been exposed to 20 kHz at 120 dB SPL for exposure durations of 7.5, 6.5, 5.0, and 3.25-min and killed either 3 or 12 weeks post-exposure. One series of guinea pigs exposed for 30-min had cochlear potentials recorded 3 weeks post-exposure. The damage was assessed by surface preparations and quantified as percentage hair cell loss per segment in every row, total number of outer, and inner hair cells missing and the area of total outer hair cell damage. A significantly smaller number of ears were found to be damaged after the shortest exposures, but no significant differences could be detected in the amounts of damage when all the series were compared. Myelinated nerve fibre degeneration had increased after the longer post-exposure interval, but no such differences were observed in the sensory hair cell degeneration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00453467
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The megachiroptera and vespertilionoidea of the microchiroptera (1966)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 119 (1966), S. 101-119 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The structure of the external ears and the ultrasonic cries produced by one member of the single family of Megachiroptera and six representatives of the Vespertilionoidea of the Microchiroptera have been described. All the specimens were intra-vitally fixed and the preparations have been examined, photographed and measured. Brief notes are given on the middle ear and the following measurements have been made on the cochlea: the general size of the cochlea in various dimensions, the width and thickness of the basilar membrane, the size of the spiral ligament and the height of the cells of Claudius. In conclusion it can be said that there are marked differences in the structure of the cochleae of the two suborders, as well as within the superfamily Vespertilionoidea.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051190202
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    The structure of the cochlea in chiroptera. III. Microchiroptera: Phyllostomatoidea (1967)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 121 (1967), S. 241-254 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The middle ear and the cochlea have been described in 20 representatives from the superfamily Phyllostomatoidea of the suborder Microchiroptera. Various measurements have been made and the results compared by means of graphs. The ultrasonic pulses used by these bats for echolocation have been recorded and analysed. Generally, the structure of the cochlea does not show extreme modifications as found in some other superfamilies that have previously been discussed.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051210305
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    The structure of the cochlea in chiroptera. I. Microchiroptera: Emballonuroidea and Rhinolophoidea (1966)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 118 (1966), S. 495-510 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The structure of the ears, especially of the cochleae, has been examined in two superfamilies, i.e. Emballonuroidea and Rhinolophoidea of the Microchiroptera. An intra-vitam fixation method was used and gave good histological preparations. The following features of the cochlea have been measured: the general size of the cochlea, the width and thickness of the basilar membrane, the size of the spiral ligament and the height of the cells of Claudius. The interpretation of measurements is discussed in relation to the nature of ultrasonic sounds produced by bats. It is concluded that functional interpretation of specific cochlear modifications cannot be assessed at present.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051180404
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    Paper (German National Licenses)
    Fulltext
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