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  • 1
    ISSN: 1432-2307
    Keywords: Soluble fibrinogen fibrin monomer complexes ; Dissiminated intravascular coagulation ; Fibrin degradation products (FDP) ; Reticuloendothelial system (RES)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In states of plasmic hypercoagulability and consumption coagulopathy ethanol favours the non-enzymatic polymerization of circulating soluble fibrinogen fibrin monomer complexes (FFMC) in vitro. The ethanolgelation test of Godal and Abildgaard makes use of this phenomenon, called paracoagulation. The present studies show that it is also possible to visualize soluble FFMC by means of ethanol-gelation. In the electron microscope, FFMC, polymerized non-enzymatically by ethanol in the spleen, are characterized by plump or slender mycelioid fibrillar precipitates that show a uniform rhythmic transverse striation, a period-coincidental filamentary arrangement and an average periodicity of 23 nm. The ultrastructure demonstrates these ethanol-induced filaments to be in vitro-polymerized fibrin monomer derivatives. Paracoagulation with ethanol allows the identification of soluble FFMC in the tissue prior to the formation of highly polymerized fibrin-rich microthrombi, the established equivalents of the DIC-syndrome. The electron microscope studies also show the existence of a second type of fibrillary structure in the tissue polymerized by ethanol. This second type lacks the characteristic periodicity of fibrin and the period-coincidental arrangement of the filamentary structures, but is characterized by closely packed or chain-like aligned, irregularly sized spherical bodies. There is some evidence that these spherical bodies in vitro represent non-enzymatically polymerized complexes of fibrin monomers and fibrin degradation products (FDP), the equivalent of a limited local or generalized fibrinolysis in vivo.
    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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