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  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 159 (1969), S. 0 
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 381 (1982), S. 0 
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Acta neuropathologica 8 (1967), S. 69-75 
    ISSN: 1432-0533
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Die Implantation von Pellets chemischer Cancerogene in das Kleinhirn erwachsener Mäuse von Inzuchtstämmen (C3H und C5 7Bl) erzeugen nach 150 Tagen eine Zellreaktion, in der sich Phagocytose des Carcinogens nachweisen läßt. Die phagocytierten Carcinogenpartikel reagieren mit dem endoplasmatischen Reticulum der reaktiven Zellen und bilden virusartige Partikel von bestimmter Größe und morphologischer Erscheinungsform. Die Partikel nehmen an Zahl zu und verschwinden im Zeitpunkt der Tumorzellausbreitung. Die Tumorzellen scheinen von den Neuronen der Körnerzellschicht der Kleinhirnrinde und mitunter zusätzlich von Astrocyten auszugehen. In seltenen Fällen enthält das sogenannte Medulloblastom zusätzlich Zellen sarkomatöser Natur.
    Notes: Summary Pellets of chemical carcinogens when implanted into the cerebella of adult mice of inbred strains (C3H and C5 7 Bl) produce after 150 days a cellular reactive response in which there is evidence of phagocytosis of the carcinogen. The phagocytized crystalline particles of carcinogen interact with the endoplasmic reticulum of the reactive cells to produce virus like particles of a distinctive size and morphologic appearance. These particles increase in number with time and disappear just as tumor cells emerge. The tumor cells appear to be derived from the neurons of the granular cell layer of the cortex and sometimes, in addition, from astrocytes. In rare instances the so-called medulloblastoma contains, in addition, cells of a sarcomatous nature.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Acta neuropathologica 6 (1966), S. 188-200 
    ISSN: 1432-0533
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung 1. Die Entwicklung des Plexus choroideus in der Ratte vom 1.–3. Tag vor der Geburt bis zur Reife wurde mit histochemischen Methoden und mit dem Elektronen-Mikroskop untersucht. 2. Die Reifung des Plexus-Epithels ist verbunden mit dem Schwund des Glykogens im Cytoplasma, mit eine Zunahme der Oberfläche der Zellmembrane zusammen mit dem Erscheinen von Adenosine-Triphosphatase-Aktivität sowie mit einer Zunahme von Mitochondrien und von endoplasmischem Reticulum zusammen mit einer Zunahme der Diaphorase- und Dehydrogenase-Aktivität. Nach der Geburt kann die Aktivität von Thiamine-Pyrophosphatase und von Adenosine-Mono- und Di-Phosphatase in den Blutgefäßen nachgewiesen werden. Zellstrukturen, die pinocytotische Aktivität besitzen, sind in größter Anzahl in jungen Ratten vorhanden. 3. Es wird angenommen, daß die erhöhte Empfänglichkeit von jungen Ratten für experimentell erzeugten Hydrocephalus auf die besondere Fähigkeit von deren Plexus choroideus zu aktivem Transport zurückzuführen ist.
    Notes: Summary 1. A histochemical and fine structural study of the developing rat choroid plexus was made from 1–3 days before birth to the adult stage. 2. The maturation of the choroidal epithelium is associated with a loss of cytoplasmic glycogen, increasing surface area of the plasma membrane associated with the development of an apparent adenosine triphosphatase activity, and increasing numbers of mitochondria and prominence of the rough endoplasmic reticulum associated with increasing diaphorase and dehydrogenase activity. Following birth, thiamine pyrophosphatase and adenosine mono- and diphosphatase activity appear in the blood vessels. Structures associated with pinocytotic activity are most numerous in young rats. 3. It is suggested that the increased susceptibility of young rats to experimentally produced hydrocephalus is related to the potential of their choroid plexus for active transport.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1432-0533
    Keywords: Malignant Lymphoma ; Blood Vessels ; Lymphe Node ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The fine structure of the blood vessels of an apparently primary intracerebral malignant lymphoma was compared with those in another malignant lymphoma in a retroperitoneal lymph node. The essential features of the blood vessels in both cases were the same. They resembled the blood vessels found in normal lymph nodes and were both distinctly different from those seen in normal brain. It was concluded that the direction of differentiation of the blood vessels which arise to nourish the neoplastic tissue is determined by the nature of the tumor rather than the vessels from which they originate.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Acta neuropathologica 10 (1968), S. 17-25 
    ISSN: 1432-0533
    Keywords: Myelinated CNS axons ; Axoplasm ; Tubular structures ; Axonal reactive changes ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Eine honigwabenartige tubuläre Anordnung wurde in stark myelinisierten Axonen gefunden. Sie wurde im Kleinhirn einer offenbar gesunden Ratte und eines Schimpansen mit Kuru-ähnlichen Symptomen beobachtet. Sie fand sich ferner in der Großhirnrnde einer Maus mit einem intracerebralen Tumorimplantat. Eine verbindliche Ursache konnte nicht aufgedeckt werden. Es wird jedoch angenommen, daß diese Struktur eine spezifische axonale Reaktion auf eine mögliche Vielfalt von noch unbekannten Bedingungen entspricht.
    Notes: Summary A honeycomb-like tubular array was observed in heavily myelinated axons. It was observed in the cerebellum of an apparently normal rat and a chimpanzee with “Kurulike” symptoms. It was also found in the cerebral cortex of a mouse that had had a intracerebral tumor implant. A common underlying etiology could not be found. It is suggested, however, that this structure represents a specific axonal response to perhaps a variety of as yet unknown conditions.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Acta neuropathologica 26 (1973), S. 171-177 
    ISSN: 1432-0533
    Keywords: Blood Vessel ; Craniopharyngioma ; Electron Microscope ; Fenestrae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The fine structure of two cases of craniopharyngioma was studied. Special attention was paid to the vasculature. The most striking finding is the presence of numerous fenestrae in the vascular endothelium. These structures are not present either in most parts of the normal brain or in skin, the organ which craniopharyngiomas most closely resemble. The origin of the fenestrae was discussed.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Acta neuropathologica 26 (1973), S. 265-272 
    ISSN: 1432-0533
    Keywords: Alzheimer Neurofibrillary Tangles ; Electron Microscope ; Eosinophilic Rod-like Structures ; Phosphotungstic Acid
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The ethanolic phosphotungstic acid technique of Bloom and Aghajanian has been applied to formalin-fixed neuropathological specimens. The staining reactions of various normal organelles were studied as well as a number of pathological alterations including Alzheimer neurofibrillary tangles, eosinophilic rod-like structures, corpora amylacea, lamellar bodies and honeycomb-like structures in the axoplasm.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1432-0533
    Keywords: Steele-Richardson-Olszewski Syndrome ; Progressive Supranuclear Palsy ; Neurofibrillary Tangles ; Electron Microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The neurofibrillary tangles found in the neurons of a case of Steele-Richardson-Olszewski syndrome were studied by electron microscopy. Both the flame-shaped and globose type of tangles were present. The neurofibrillary tangles were composed of bundles of straight tubules measuring approximately 150 Å in diameter. This ultrastructural appearance of the tangles in Steele-Richardson-Olszewski syndrome is different from the appearance of tangles found in other neurological disorders and is probably indicative of intraneuronal accumulation of a new type of fibrous protein.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Acta neuropathologica 10 (1968), S. 308-323 
    ISSN: 1432-0533
    Keywords: Experimental brain tumors ; Virus with brain tumors ; Electron microscopy ; Histochemistry ; Hydrocarbon (crystalls), oncogenic
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Krebserzeugende Kohlenwasserstoffe wurden in Gehirn und Muskel von C3H Mäusen implantiert. Dabei konnten virusähnliche, cylindrisch geformte Partikel in den präcarcinomatösen Läsionen nachgewiesen werden. Die filamentartigen Stäbchen wurden nur im Cytoplasma von solchen Zellen beobachtet, die phagocytiertes Carcinogen enthielten. Die meisten Zellen, in denen diese Viruspartikel nachzuweisen waren, wurden als Makrophagen angesehen und es wird angenommen, daß sie mesenchymaler Herkunft sind. Der genaue Mechanismus, durch den die krebserzeugende Wirkung der Kohlenwasserstoffe zur Bildung von Viruspartikel führt, ist nicht klar, aber offensichtlich ist das endoplasmatische Reticulum beteiligt. Viele Partikel konnten innerhalb der Cisternen beobachtet werden; dabei wurde ihre äußere Hülle von der Membran des endoplasmatischen Reticulums gebildet. Gelegentlich wurden die Viruspartikel auch zwischen den zwei Membranen der Kernhülle beobachtet. Die Bedeutung dieser Partikel in Beziehung zu den Tumoren ist unbestimmt. Die Möglichkeit besteht, daß sie eine unreife oder unvollendete Form darstellen und daß zusätzliche Faktoren erforderlich sind, um ihre krebserzeugende Wirkung hervorzubringen.
    Notes: Summary Carcinogenic hydrocarbons were implanted into brain and muscle of C3H mice. Virus-like particles of cylindrical form were demonstrated in the precancerous lesions. These filamentous rods were observed only within the cytoplasm of those cells which contained phagocytosed carcinogen. The majority of reactive cells containing the virus-like particles were identified as macrophages, and are thought to be mesenchymal in origin. The precise mechanism by which the carcinogenic effect results in the formation of virus-like particles is not clear, but evidently involves the endoplasmic reticulum. Many of the particles were found within the cisternae, and their outer shells were derived from the membranous component of the endoplasmic reticulum. Occasionally, they were seen between the two membranes of the nuclear envelope. The significance of these particles in relationship to tumors is not certain. The possibility exists that they represent immature or incomplete forms and that additional factors may be necessary to prove them oncogenic.
    Type of Medium: Electronic Resource
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