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  • 1
    ISSN: 1432-0533
    Keywords: Leucodystrophy Metachromatic ; Electron Microscopy ; Prismatic Deposits ; Brain ; Peripheral Nerve ; Kidney ; Rectum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Clinical history, light and electron microscopy findings are reported in four cases of infantile metachromatic leucodystrophy. By electron microscopy, the authors describe the various types of lesions and the different lipid deposits noticed in the central and peripheral nervous system, in the kidney and rectum. They stress the prismatic lipid deposits observed not only in the cerebral white matter and in the kidney but in the peripheral nerves as well.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 12 (1974), S. 115-130 
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Effects of neutralization on butadiene-methacrylic acid copolymers have been studied. In Hycar CTB with 2% acid groups, small-angle x-ray scattering gives evidence of some cation clustering and leads to a value of the mean radius of 5.6 Å for the clusters and a value of the distance between them of 70 Å. When the concentration of salt is increased there is no appreciable change in the distance between clusters or in their size, but their number increases. The structure of clusters has been studied by electron paramagnetic resonance in copolymers neutralized with copper salts. The appearance of a line as in the monohydrated acetate salt permits one to define the structure of clusters consisting of two Cu2+ and four RCOO- ions with two H2O or RCOOH molecules. When the temperature is increased, the signal corresponding to Cu2+-Cu2+ pairs disappears. In high molecular weight butadiene methacrylic acid copolymers with 9% acid groups, we have found the ion pair clusters gathered into larger clusters. In dynamic mechanical properties, a relaxation peak appears at 340°K. We interpret this as due to breaking and possible re-forming of dipolar associations.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The copolymerization of vinylhydroquinone (VHQ) and vinyl monomers, e.g., methyl methacrylate (MMA), 4-vinyl-pyridine (4VP), acrylamide (AA), and vinyl acetate (VAc), by tri-n-butylborane (TBB) was investigated in cyclohexanone at 30°C under nitrogen. VHQ is assumed to copolymerize with MMA, 4VP, and AA by vinyl polymerization. The following monomer reactivity ratios were obtained (VHQ = M2): for MMA/VHQ/TBB, r1 = 0.62, r2 = 0.17; for 4VP/VHQ/TBB, r1 = 0.57, r2 = 0.05; for AA/VHQ/TBB, r1 = 0.35, r2 = 0.08. The Q and e values of VHQ were estimated on the basis of these reactivity ratios as Q = 1.4 and e = -;1.1, which are similar to those of styrene. This suggests that VHQ behaves like styrene rather than as an inhibitor in the TBB-initiated copolymerization. No homopolymerization was observed either under nitrogen or in the presence of oxygen. The reaction mechanism is discussed.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 12 (1974), S. 2821-2843 
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: An overall mechanistic scheme for the suspension polymerization of vinyl chloride is presented. The process can be resolved into five discrete stages, each of which presents a unique environment for the interaction of the systems parameters. It is shown that the surface area of the polymer formed during the reaction is not a major factor in autoacceleration and that the increase of kinetic chain length with conversion is due to a radical dilution effect. The latter is a direct result of the difference in rates between polymerization and radical formation, the former being greater. The increase of the initial polymerization rate and the reduction of autoacceleration brought about by chain transfer agents can be explained by the lower diffusion rate and greater bulkiness of the chain transfer agent radical relative to that of the monomer radical. The chaintransfer agent CBr4 is preferentially absorbed by PVC from solution in vinyl chloride. With lauryl peroxide as initiator it is shown that the “hot spot” is the result of a build-up of initiator in the monomer caused by its exclusion from the polymer phase. Vinyl chloride was found to dissolve 0.03% PVC at ambient temperature and to have no effect on the decomposition rate of lauryl peroxide.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 9 (1971), S. 1013-1025 
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The process of radiation-induced crosslinking of cellulose is found to be highly influenced by radiation dosage and dose as well as by the solvents used and their concentration. The best crease resistance has been obtained in cases when cellulose is crosslinked with acrolein in the vapor phase. Moreover, the process is entirely radiation-induced and practically no homopolymer is formed. Chemical analysis and investigations of infrared spectra indicate that crosslinking proceeds on vinyl as well as on aldehyde groups of acrolein.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1432-0533
    Keywords: Neuronal Ceroid Lipofuscinosis ; Electron Microscopy ; Membranous and Fingerprint Inclusions ; Hypertrophied Cortical Astrocytes ; Nuclear Bodies
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Sommaire Deux cas de la maladie de Batten-Spielmeyer-Vogt (idiotie amaurotique familiale juvénile) ont été étudiés en microscopie électronique, histochimiquement et biochimiquement. Le premier cas, dont l'histoire clinique a débuté à l'âge de 3 ans, a révélé des inclusions cytoplasmiques dans les cellules neuronales et gliales, composées de membranes fréquemment disposées en paires. La structure de ces inclusions était identique à l'examen du matériel autopsié six mois plus tard. Dans le deuxième cas, dont l'histoire clinique date de 4 ans et 4 mois, les inclusions étaient plus pléomorphes: elles étaient en général plus denses en électronique et comportaient fréquemment un élément à l'aspect d'«empreintes digitales». Quelques inclusions membraneuses semblables à celles du premier cas y ont également été retrouvées. En outre ont été observées une hypertrophie cytoplasmique prononcée des astrocytes corticaux, et une grande fréquence de cils, de corps basaux et de corps nucléaires dans ces astrocytes. Un paquet de filaments intranucléaires a été observé dans un neuron. Les données neurochimiques n'ont révélé aucune abnormalité dans les lipides ou les protéines du premier cas, ou dans les gangliosides du second. Malgré les différences morphologiques qui les caractérisent, la présence simultanée des deux types d'inclusions cytoplasmiques dans le même cas suggère qu'elles peuvent représenter des stages divers dans l'évolution du même processus fondamental. Il est possible que ce soit l'âge de la cellule nerveuse, lors de l'atteinte métabolique dont elle est l'object, qui détermine ces différences.
    Notes: Summary Electron microscopic, histochemical and neurochemical studies on two cases of Batten-Spielmeyer-Vogt disease (juvenile amaurotic familial idiocy) are presented. In the first case, with the clinical onset at the age of 3 years, cytoplasmic neuronal and glial inclusions consisted of membranous bodies, the membranes of which were frequently paired. The fine structure of these inclusions was unaltered when examined in autopsy material 6 months later. In case 2, with the clinical onset at 4 years and 4 months, the inclusions were more pleomorphic: they were usually more electron-dense, and frequently showed a characteristic “fingerprint” pattern component. A few membranous inclusions resembling those in case 1 were also present. Additional findings included marked cytoplasmic hypertrophy of inclusion-containing cortical astrocytes, and frequent cytoplasmic cilia, basal bodies, and nuclear bodies in the hypertrophic astrocytes. A packet of intranuclear filaments was found in one neuron. Neurochemical studies failed to reveal any abnormality of lipid or protein pattern in case 1, or of ganglioside pattern in case 2. Despite the morphological differences between the two types of cytoplasmic inclusions, the presence of both types within the same case suggests that they may represent different stages in the evolution of a single process. It is conceivable that such differences are related to the age of the neuron when the postulated intracellular defect first becomes manifest.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1432-0533
    Keywords: Herpes Virus, Type 2 ; Tissue Culture ; Intranuclear Tubules ; Microtubular Structures ; Electron Microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Mature explants of mouse spinal cord and ganglia have been infected with Herpes virus hominis type 2. After 48 h, a high titer of virus was detected in the explant and typical herpes-like particles were seen by electron microscopy. They were more numerous in sensory neurons and Schwann cells than in the CNS possibly because of a more rapid propagation through the extracellular space in spinal ganglia. In the infected nuclei, besides the naked particles, numerous tubular formations were found, apparently resulting from virus infection and specific for herpes type 2. Their dimensions and fine structure are illustrated and compared to other microtubular formations. In the cytoplasm of theneurons, a dramatic disorganisation occurred and, in the Schwann cell, the plasma membrane underwent disruption. Consequently, the normal axon — Schwann cell intimate contact was lost.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Acta neuropathologica 24 (1973), S. 62-67 
    ISSN: 1432-0533
    Keywords: Dystrophia Myotonica ; Electron Microscopy ; „Fingerprint Inclusions” in Muscle Fibres
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary „Fingerprint inclusions” were observed in numerous muscle fibres of 3 cases of dystrophia myotonica studied by electron microscopy in two different laboratories. They consist of parallel or concentric palisades of short electron dense linear elements. Identical „fingerprint inclusions” were reported in two other clinical conditions and cannot therefore be regarded as specific for a particular muscle disease. Their origin and significance remain obscure.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Acta neuropathologica 18 (1971), S. 327-341 
    ISSN: 1432-0533
    Keywords: Infantile Neuroaxonal Dystrophy ; Electron Microscopy ; Striated Muscle ; Membranous-Tubular Structures ; Filamentous Structures
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary This paper deals with the first ultrastructural study of muscle fiber in a child affected by infantile neuroaxonal dystrophy or Seitelberger's disease. In a first step, diagnosis was performed by light and electron microscopy in biopsy and autopsy findings in central and peripheral nervous system. Muscle fiber and axonal changes are very similar. The ultrastructure findings in muscle fiber are as follows: 1. neural atrophy, 2. overproduction of membrano-tubular structures related to sarcoplasmic reticulum hyperplasia, 3. filamentous aggregates by presumed overproduction of myofilaments, 4. overproduction of abnormal mitochondria. These changes, already described in various muscular diseases, are not specific; they seem related to an abnormal muscle fiber reaction in close association to dystrophic axonal endings.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Acta neuropathologica 21 (1972), S. 169-175 
    ISSN: 1432-0533
    Keywords: Batten's Disease ; Electron Microscopy ; Appendix ; Curvilinear Inclusion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The electron microscopic findings in the appendix of a five-year-old child suffering from Batten's disease are presented. They revealed accumulations of curviform densities in smooth muscle cells, nerve cells and Schwann cells of the myenteric plexus of Auerbach. Typical lipofuscin pigment was not observed. The presence of transitional forms, however, suggesting progressive transformation of the inclusions into lipofuscin-like granules, is briefly discussed. It is proposed that, during life, electron microscopy of the appendix might be useful for the diagnosis or more specific classification of a form of storage disease.
    Type of Medium: Electronic Resource
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