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  • 1
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Cell Biology International Reports 10 (1986), S. 182 
    ISSN: 0309-1651
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Cell Biology International Reports 10 (1986), S. 182 
    ISSN: 0309-1651
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-1459
    Keywords: Central core disease
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Aus einer Familie, in welcher die Erkrankung autosomal dominant vererbt wird, werden Vater und Tochter mit Central Core Disease beschrieben. Bei einem Fall besteht außerdem eine bilaterale congenitale Hüftgelenksluxation. Die in beiden Fällen durchgeführte Muskelbiopsie ergab folgendes: Dargestellt durch den histochemischen Nachweis oxydativer Enzyme fanden sich ausschließlich Typ-I-Fasern, von welchen die meisten ein und nicht selten sogar mehrere „Central Core“ aufwiesen. In der Elektronenmikroskopie erschienen die „Cores“ allgemein gut von den umgebenden Fibrillen abgegrenzt und waren durch das Fehlen von Mitochondrien und Anomalien der Z-Linien charakterisiert. Es wurden Übergänge zwischen normalen Fasern einerseits und vollständig unstrukturierten „Cores“ andererseits beobachtet, wie auch Übergänge von gut strukturierten und unstrukturierten „Cores“. Die Befunde werden unter Berücksichtigung der einschlägigen Literatur diskutiert. Es wird besonders eingegangen auf das Problem der Unterscheidung zwischen „Central Core“ und „Multiple Core“ und „Multiple Core Disease“. Die Pathogenese der Muskelveränderung wird im besondern auch im Hinblick auf die mögliche neurogene Verursachung diskutiert. Es wird im weitern auf die histochemischen und ultrastrukturellen Gemeinsamkeiten zwischen „Central Cores“ und „Target Fibers“ eingegangen.
    Notes: Summary Two cases of central core disease, father and daughter, of a family with dominant autosomal inheritance, are presented, one with bilateral congenital dislocation of the hip. Muscle biopsy was performed in both cases. Oxidative enzymes evidenced only type I fibers, most of them presenting a central core and not uncommonly more than one. On electron microscopy the cores generally appeared well demarcated from the surrounding fibrils and were characterized by lack of mitochondria and abnormalities of the Z line. Transitional aspects from normal fibers to completely unstructured cores were observed, as well as from well structured and unstructured cores. These findings are discussed in the light of the previous literature and particular attention is paid to the problem of differentiation between central core and multicore disease. The pathogenesis of the muscular alteration is also discussed in relation with the possibility of their neurogenic origin. Eventually, the histochemical and ultrastructural similarities between central cores and target fibers are focused.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1432-1920
    Keywords: BCNU ; Chemotherapy ; Malignant gliomas
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Study of intra-arterial BCNU in 12 patients with recurrent glioblastoma multiforme and 5 patients with recurrent anaplastic astrocytoma already treated by surgery and radiotherapy indicates that the risk of BCNU toxicity can be reduced by the use of relatively low doses (160–180 mg/m2) of BCNU, the use of dextrose as solvent, selective injections of BCNU, and fast “bolus” injections of drug. No certain toxic effects of BCNU were observed in the 17 patients treated this way. Anaplastic astrocytomas, particularly in young patients, seem to respond relatively well to this treatment.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Journal of neurology 211 (1976), S. 125-133 
    ISSN: 1432-1459
    Keywords: Histochemistry ; Ultrastructure (tubular aggregates) ; Muscle ; Paramyotonia ; Myotonia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Bei einem Fall von kongenitaler Paramyotonie wurde eine Muskelbiopsie lichtmikroskopisch, histochemisch und elektronenoptisch untersucht. Typische Veränderungen ergaben sich in der ATPase-Färbung und in bezug auf oxydative Enzyme. Bei der elektronenoptischen Untersuchung wurden sogenannte „tubuläre Aggregate“ festgestellt. Es wird die Beziehung der zwei Gruppen von Veränderungen zueinander diskutiert sowie auch die Bedeutung derselben im Rahmen der periodischen Lähmungen und der myotonen Phänomene.
    Notes: Summary In a case of congenital paramyotonia a muscle biopsy was performed and studied morphologically, histochemically and ultrastructurally. A clearcut pattern of changes has been observed with ATPase and oxidative enzymes. On electron microscopy special changes known as “tubular aggregates” were found. The relationship between the two findings, as well as the significance of such alterations in the range of periodic paralyses and myotonic phenomena, are discussed.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Child's nervous system 5 (1989), S. 220-229 
    ISSN: 1433-0350
    Keywords: Undifferentiated neuroepithelial tumors ; Childhood
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Brain tumors containing undifferentiated cells were selected from a series of 504 childhood brain tumors; 117 were analyzed. Most tumors were medulloblastomas, followed by cerebral neuroblastomas, pineocytomas-blastomas, ependymoblastomas, and polar spongioblastomas. Of each oncotype, the main histological features were evaluated, including differentiation and the most important prognostic factors. The terminology and different tumor entities are discussed in light of the recent PNET system. The usefulness of its application is evaluated in relation to prognosis.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Acta neuropathologica 72 (1986), S. 189-196 
    ISSN: 1432-0533
    Keywords: Chondroitin sulfate ; Gliomas ; Glycosaminoglycans ; Immunohistochemistry ; Proteoglycans
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary A polyclonal rabbit antiserum was utilized to localize chondroitin sulfate in human gliomas. Tissue sections were digested with chondroitinase ABC to create the antigenic determinant on the chondroitin sulfate proteoglycan molecule. Normal CNS tissue showed a positive immunohistochemical staining both in white and gray matter, sparing the cytoplasm of glial and neuronal cells. Diffenentiated astrocytomas presented the same pattern as the normal CNS. Anaplastic astrocytomas and glioblastomas showed progressive reduction of parenchymal positivity as anaplasia increased. These data suggest that chondroitin sulfate is a character expressed by differentiated CNS cells and that it is lost with dedifferentiation. Vascular structures presented positive material in the adventitia in all the oncotypes. A discontinuous positivity was observed in the basal membrane zone of the vessels.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Acta neuropathologica 77 (1989), S. 369-378 
    ISSN: 1432-0533
    Keywords: Angiogenesis ; Gliomas
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Neo-vascularization and endothelial hyperplasia have been shown to be very active in malignant gliomas. In this contribution the vascularization of the cortex infiltrated by malignant gliomas is morphometrically studied and the endothelial proliferations are immunohistochemically investigated and reconstructed by a three-dimensional computer-assisted procedure. Vessel density increases after tumor infiltration in some cases only. The diameter of vessels increases and so does the number of nuclei/vessel after the complete invasion of the cortex when vascular glomeruli develop. In completely infiltrated cortex with development of glomeruli and circumscribed necroses, vessel density is very low. No neoformation of vessels takes place before the complete infiltration of the cortex by the tumor. The hyperplastic formations, usually arranged parallel to the deep or outer cortical layers, take origin from the radially penetrating vessels from the meninges and their lateral branching. The hyperplasia deforms the vascular network, making it often inadequate to supply tumor cells. Immunohistochemically, the cells composing the hyperplastic structures are variably positive for factor VIII/RAg and, at a lesser extent, for α-smooth muscle actin. The poorness of the vascular network in many instances of completely infiltrated cortex is responsible for the development of circumscribed necroses.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1432-0533
    Keywords: Brain injury ; Ethylnitrosourea ; rat ; Gliomas ; Bromodeoxyuridine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Fisher 344 rats born from mothers treated with ethylnitrosourea (ENU) 50 mg/kg intravenously were injured at the 1 st and 2nd month of extrauterine life by a transcranial stab. The wound affected cerebral cortex, white matter and basal ganglia. The animals were killed 15 and 45 days and 5 months after injury and cell reaction was studied histogically and immunohistochemically. Bromodeoxyuridine (BrdUrd) was administered 1 h before sacrifice and the labeled cells were evaluated. In ENU-treated rats injured at 1 month of age only minor differences were found in comparison with injured controls. In ENU rats injured at 2 months of age and killed 15 days later, a higher number of BrdUrdlabeled cells was found in comparison with controls; 45 days after injury the cell reaction acquired the aspect of a microtumor, however, no microtumor unrelated with the needle track was present. In ENU rats killed 5 months after the injury, there was no difference between injured and not injured ENU-treated rats, as far as the aspect and the number of tumors were concerned. The tumor phenotype was, thus, anticipated by the cell response to trauma in ENU rats. The interpretation is that the additional cell division, in response to trauma, anticipate not only the phenotypic, but also the cell kinetics changes, as indicated by BrdUrd labeling.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 1432-0533
    Keywords: Proliferating cell nuclear antigen (PCNA) ; Brain tumors ; Cell density ; Mitotic index ; Prognosis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Proliferating cell nuclear antigen (PCNA)/cyclin is currently often investigated immunohistochemically in tumors as a marker of cell proliferation, but many problems remain open concerning its reliability as a prognostic factor. PCNA has been studied in a series of 123 brain tumors using the monoclonal antibody PC10. A clear intra-and inter-tumor variability of PCNA-positive nuclei has been found, but taking into account the tumor areas with the highest number of positive nuclei, a positive correlation between this number and the histological malignancy of tumors has been demonstrated. The staining intensity of nuclei was variable; very-intensely positive nuclei, counted separately, are hypothesized to represent nuclei in S-phase of the cell cycle. In ependymomas the investigation included a quantitative statistical analysis. The number of PCNA-positive nuclei correlated with cell density and mitotic index, but only very intensely positive nuclei showed a significant statistical correlation with survival. In spite of the many possibilities of wrong interpretation of PCNA expression, the most important of which is its deregulation, the method is useful in the practice for prognostic purposes. Its important advantages are the possibility of a retrospective application and a visual analysis of the proliferation potential of tumors.
    Type of Medium: Electronic Resource
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