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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Pflügers Archiv 344 (1973), S. 187-193 
    ISSN: 1432-2013
    Keywords: Superior Colliculus ; Transfer Function ; Body Tilt
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The influence of body tilt upon the reactions to a visual stimulus was tested in 54 single neurons of the cat's colliculus superior. The statistical analysis did not reveal modification of neuronal reactions by body tilt. In a second series of experiments we studied the influence of body position on eye position, which had been induced by focal electrical stimulation of the colliculus superior. Again, the body tilt did not modify the electrical stimulation effect. Our results suggest, that tonic vestibular stimuli do not influence the excitability of neurons of the superior colliculus.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1435-1803
    Keywords: myocardium ; ethanol ; ultrastructure ; morphometry ; capillaries
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Männliche Kaninchen wurden 3 Wochen lang mit Äthanol gefüttert. 10 ml einer 20%igen Äthanollösung wurden täglich mit einer Schlundsonde verabreicht. Die makroskopische, mikroskopische und ultrastrukturelle Untersuchung der Herzen ergab keine eindeutigen strukturellen Veränderungen. Morphometrisch waren die Endothelzellen der Kapillaren verändert, während die Muskelzellen keine abnormen quantitativen Parameter aufwiesen. Die Daten zeigen, daß die numerische Dichte der Endothelzellen erhöht ist, während die Volumendichte nicht signifikant verändert ist. Diesen Typus eines quantitativen Reaktionsmusters kann man als „Proliferation” charakterisieren. Die Proliferation beruht möglicherweise auf Äthanol-induzierten metabolischen Veränderungen, die denen bei chronischer Hypoxie ähnlich sind. Andererseits gibt es Anhaltspunkte dafür, daß die Reaktion Teil einer allgemeinen Mesenchymaktivierung nach Alkoholgabe ist, die in verschiedenen Organen beobachtet werden kann. Die Veränderung entspricht wahrscheinlich der frühen Phase einer Kapillarproliferation.
    Notes: Summary Male rabbits were fed with ethanol for 3 weeks. 10 ml of a 20% ethanol solution were applied daily with a stomach tube. The macroscopic, histologic and ultrastructural investigation of the hearts did not reveal any structural alterations. Morphometrically, the endothelial cells of the capillaries were changed, whereas the muscle cells did not show any abnormalities. The quantitative data indicate that the numerical density of endothelial cells is increased, whereas the volume density is not changed. This type of quantitative reaction pattern may be characterized as “proliferation” of endothelial cells. The proliferation is possibly related to ethanol-induced metabolic changes similar to chronic hypoxia. On the other hand, there is some evidence that the alteration is part of a general activation of mesenchymal cells in various organs after ethanol ingestion. The alteration is probably an early stage of the proliferation of capillaries.
    Type of Medium: Electronic Resource
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