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  • 1
    Electronic Resource
    Electronic Resource
    The innervation of skeletal muscles in chickens curarized during early development (1983)
    Springer
    Journal of neurocytology 12 (1983), S. 887-919 
    Details
    ISSN: 1573-7381
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Chicken embryos were treated with partially paralysing doses ofd-tubocurarine (dtc) from embryonic (E) days 6 to 10. The pattern of innervation of the lateral gastrocnemius (GL) muscle was examined both morphologically and physiologically just before hatching on day E20 or E21. There was a 70% increase in number of surviving motor neurons in the lateral motor column and a 50% increase in the number of myelinated axons in the nerve to GL. The GL muscle was significantly atrophic, with an average weight of 40% of normal. The atrophy was largely due to the reduced size of the muscle fibres. The mean size of the motor units was essentially unchanged or perhaps slightly increased. There was a striking increase in the level of polyneuronal innervation of the muscle fibres, both in terms of number of synaptic sites per fibre and number of axons innervating each site. Spontaneous miniature endplate potentials (mepps) indicated focal innervation of the fibres in the normal muscle. Most fibres in the dtc-treated muscles had mepps of widely varying time courses, and there was no simple relation between amplitude and rise time. Many of the slow mepps were not represented in the endplate potentials evoked by nerve stimulation. The quantal content of the endplate potential (epp) was generally increased in the dtc-treated muscles. The findings are discussed in terms of a retrograde signal from muscle to nerve and its dependence on muscle activity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01153341
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Failure to induce toxicity in lambs by administering saponins from Narthecium ossifragum (1991)
    Springer
    Veterinary research communications 15 (1991), S. 483-487 
    Details
    ISSN: 1573-7446
    Keywords: alveld ; bog asphodel ; lamb ; liver ; Narthecium ossifragum ; photosensitisation, saponin, sheep
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract It has been suggested that saponins produced by Narthecium ossifragum (Bog asphodel) may be the direct cause of the toxicity leading to the hepatogenous photosensitivity disease alveld seen in Norwegian lambs. Lambs fed large quantities of freeze-dried N. ossifragum did not develop alveld. Chemical investigations on the freeze-dried material and fresh N. ossifragum showed no difference in their saponin content. These results indicate that alveld is not caused solely by the saponins produced by N. ossifragum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00346548
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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