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  • 1
    ISSN: 1432-0533
    Keywords: Tissue Culture ; Electron Microscopy ; Enzyme Histochemistry ; Sympathetic Ganglioneuroblastoma ; Medulloblastoma
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The results of combined tissue culture, ultrastructural and enzyme histochemical investigations carried out on a sympathetic ganglioneuroblastoma are reported.In vitro a vigorous sprouting of newly formed neuritic processes was observed a few days after explantation. The enzymatic reactions for acethylcholinesterase were positivein situ as well asin vitro. The tumor elements showed the ultrastructural characteristics of nerve cells with many microtubuli and filaments, plenty of ribosomes, well developed endoplasmic reticulum. Dense bodies, corresponding to neurosecretion granula (catecholamines) were also observed. Synaptic structures were missing. The results of these investigations confirm that this kind of tumor is different from so-called medulloblastoma.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-0533
    Keywords: Craniopharyngioma ; Tissue Culture ; Electron Microscopy ; Enzyme Histochemistry ; Keratine ; Enamel ; Rosenthal Fibers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Electron optical and enzyme histochemical investigations carried out on four craniopharyngiomas and their tissue cultures demonstrated that the tumour elements are keratinizing epithelial cells, plenty of tonofilaments, glycogen granules, mitochondria and desmosomes. Their ultrastructural and histochemical characteristics are the same in every part of the tumour (solid; cystic; “adamantinoma-like”). In the keratinizing cells, the reactions for non-specific esterases were high positive. The ultrastructural characteristics of the tumour cells grownin vitro are the same as thosein situ; the cells remain attached to one another by desmosomes and retain their capacity to produce keratine. This therefore seems to be a primary characteristic of the tumour cells and not a secondary dysmetabolic disturbance. Calcium was found onlyin situ. That the tumour cells may produce enamelin situ seems to be possible, but it could not be confirmed with certainty. The glial proliferation which is always presentin situ, is reactive and not neoplastic; thein vitro new built cell colonies consist only of epithelial elements.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Virchows Archiv 367 (1975), S. 181-194 
    ISSN: 1432-2307
    Keywords: Malignant Hyperthermia ; Latent Myopathy ; Enzyme Histochemistry ; Electron Microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Die maligne Hyperthermie ist charakterisiert durch einen rapiden Anstieg der Körpertemperatur, Muskelkontraktionen und zunehmende Hypoxie. Sie ist eine moderne Narkosekomplikation mit einem sehr hohen Letalitätsrisiko von über 60%. Da über die morphologischen Veränderungen bei maligner Hyperthermie sehr wenig bekannt ist, wurden an Muskelbiopsien von 3 Patienten mit maligner Hyperthermie und einem sog. Risikopatienten histologische, histochemische und elektronenmikroskopische Untersuchungen durchgeführt. Histologisch zeigten sich akute Muskelfasernekrosen, außerdem wurden Hinweise für eine latente Myopathie erhoben. Histochemisch ergab sich, daß beide Muskelfasertypen I und II befallen waren. Mit der Phosphorylase-Reaktion konnten auch bei Fasern, die bei üblicher histologischer Bearbeitung unauffällig waren, pathologische Veränderungen nachgewiesen werden. Elektronenmikroskopisch konnten neben einer akuten Rhabdomyolyse eine Erweiterung der Zisternen des sarkoplasmatischen Beticulums und eine eigentümliche Einrollung bzw. Wucherung des Sarkolemms beobachtet werden. Die Befunde unterstützen die pathogenetische Vorstellung anderer Autoren, daß dieses Syndrom, das durch Inhalationsnarcotica und Muskelrelaxantien (Halothan bzw. Succinylcholin) ausgelöst wird, auf der Grundlage eines Defektes caloiumspeichernder Membranen des sarkoplasmatischen Reticulums beruht. Wegen des familiären Auftretens dieser Komplikation sollte angestrebt werden, klinische, laborchemische und morphologische Untersuchungen auch bei den Verwandten solcher Patienten zum Ausschluß einer derartigen latenten Myopathie durchzuführen.
    Notes: Summary Malignant hyperthermia is a rare but severe complication of modern anesthesia, induced by halothane and succinylcholine. The syndrome is characterized by a rapid sustained and extreme rise in body temperature associated with muscular rigidity, tachycardia, tachypnoea and cyanosis. The lethality is about 60%. The present paper describes the histological, histochemical and electron microscopical findings performed on muscle biopsies of 3 patients with malignant hyperthermia (1 patient died) and a so called risk patient. In all patients morphological findings consistent with a pre-existent myopathy were found. Histologioally there were acute necrotic muscular fibers as well as in types I and II, variations in the fiber diameter and centralization of the nuclei. In two cases even fibers that had a normal aspect in HE slides, showed a pathologic pattern after phosphorylase reaction. In addition to acute rhabdomyolysis, electron-microscopic investigations revealed cystic expansion of the cisterns of the sarcoplasmic reticulum with a peculiar proliferation of the sarcolemma. In a degenerating mitochondrium, a crystalline inclusion was identified. These findings support the pathogenetic concept of Britt and coworkers of a functional defect in the calcium release or binding mechanism of sareoplasmic reticulum. Since it is known that malignant hyperthermia has a familial predilection, it seems very important that clinical, biochemical, and morphological investigations be performed such as CPK estimations and muscular biopsies not only of the patients but also of the relatives in order to rule out this type of latent myopathy.
    Type of Medium: Electronic Resource
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