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  • 1
    Electronic Resource
    Electronic Resource
    Formation of psammoma bodies in meningocytic whorls (1986)
    Springer
    Acta neuropathologica 70 (1986), S. 262-268 
    Details
    ISSN: 1432-0533
    Keywords: Meningioma ; Psammoma body ; Fine structure ; Matrix vesicle ; Matrix giant body
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Psammoma bodies in meningocytic whorls were investigated by electron microscopy. In some whorls, connective tissue fibers were seen and membrane-bound vesicles were contiguous to degenerated cells. Some small vesicles, 0.1 to 0.5 μm in diameter, were outlined by plasma membrane (matrix vesicles), other larger ones, about 1 to several μm in diameter, were invested by a thick wall (matrix giant bodies). Mineralized deposits were frequent in these vesicles and occasionally large masses of mineralized connective tissue fibers (psammoma bodies) were seen. Analysis of the material in the mineralized vesicles and fibers, using an energy dispersive X-ray microanalyzer, showed that both calcium and phosphorous were evident and hydroxyapatite was substantiated using an X-ray differactometer. Psammoma body formation in the meningocytic whorls may represent degeneration in some whorls of the central cells which contain connective tissue fibers, producing cell debris such as membrane invested vesicles. Subsequently, calcification occurs in these vesicles, and the mineralization process extends to neighboring connective tissue fibers. The calcified mass forms a psammoma body.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00686081
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  • 2
    Electronic Resource
    Electronic Resource
    Ultrastructural study of early stage of calcification in herpes simplex encephalitis (1985)
    Springer
    Acta neuropathologica 68 (1985), S. 77-79 
    Details
    ISSN: 1432-0533
    Keywords: Herpes simplex ; Encephalitis ; Calcification ; Mitochondria
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary A case of herpes simplex encephalitis was investigated at the ultrastructural level. Herpes simplex virions were observed, both in nuclei and perikarya of degenerated cells in the cerebrum. Needle-shaped mineralized precipitates were also present in the disintegrated cells. These mineralized depositions were confined to mitochondria. This finding suggests that mitochondria serve as initial nidus of calcification in herpes simplex encephalitis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00688960
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Fine structure of psammoma bodies at the outer aspect of blood vessels in meningioma (1985)
    Springer
    Acta neuropathologica 66 (1985), S. 163-166 
    Details
    ISSN: 1432-0533
    Keywords: Meningioma ; Psammoma bodies ; Perivascular area ; X-ray microanalysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Psammoma bodies at the perivascular area in five cases of meningioma were examined with the electron microscope. In general, meningocytic cells invest the outer aspect of blood vessels, which are constituted by multilayered basal laminae, collagen fibers, microfibrils, and pericytes. Remnants of degenerated cells are observed in some areas of the perivascular space. Matrix vesicles and matrix giant bodies with or without mineralized deposits are also present in those areas. Energy disperisve, X-ray microanalysis evidenced the presence of both calcium and phosphorus (probably hydroxyapatite) mineralized precipitates. Production of psammoma bodies in the perivascular area may indicate that matrix vesicles and matrix giant bodies are derived from degenerated cells, which then sequestrate hydroxyapatite crystals to form psammoma bodies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00688693
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  • 4
    Electronic Resource
    Electronic Resource
    Abnormal cilia in a malignant ependymoma (1986)
    Springer
    Acta neuropathologica 71 (1986), S. 100-105 
    Details
    ISSN: 1432-0533
    Keywords: Ependymona ; Fine structure ; Abnormal cilia ; Giant cilia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Abnormal cilia were frequently exposed in a malignant ependymoma of the cerebellar vermis by an electron microscope study. Among these erratic cilia, compound cilia, huge axoneme with bizarre shapes, were repeatedly observed. These giant cilia commonly had random orientation of many microtubular doublets as well as complicated cavities in their granular ciliary matrix. Additionally, abnormal cilia of normal-sized axoneme showed diversified arrangement of peripheral doublets and central singlets. The formation process of these abnormal cilia is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00687969
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    The origin of psammoma bodies in the human arachnoid villi (1986)
    Springer
    Acta neuropathologica 71 (1986), S. 19-25 
    Details
    ISSN: 1432-0533
    Keywords: Arachnoid villi ; Psammoma body ; Matrix granule ; Matrix vesicle ; Matrix mineral
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The fine structure of the human arachnoid villi was studied to clarify the origin of psammoma bodies. Within the villous surface layer, collagen fibrils and fine granular material clustered forming microcores of variable caliber measuring up to 10 μm. An early stage of psammoma body formation was seen more frequently in these villous microcores than in the meningocytic whorls. The villous microcores contained a large number of membrane-free matrix granules as well as a small number of membranebound matrix vesicles and matrix minerals. The matrix granules were irregularly oval structures with electronlucent halo, measuring 0.05–0.70 μm in diameter. Hydroxyapatite crystals were frequently precipitated within and around the matrix granules which aggregated with calcifying matrix vesicles and matrix minerals. Numerous calcifying matrix granules were present within and around enlarging psammoma bodies. The matrix granules may serve as the principal calcification nidi of psammoma bodies in the human arachnoid villi. The possible mechanisms of matrix granule biogenesis are extrusion of preformed arachnoid cell structures or secretion of fine granular material with its extracellular assemblage.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00687957
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Magnetic properties of high-efficiency core materials NC-M1 and NC-B1 (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 3856-3858 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetic properties of high-efficiency core materials NC-M1 and NC-B1 were examined in connection with their performance when assembled in motor cores using the developed induction-type model motor. The efficiency of the model motor is better when these new steels are used owing mainly to the lower iron loss of the model motor. It is considered that lower iron loss of motor is achieved by lower alternating core loss at designed magnetic flux density, lower rotational core loss beyond designed magnetic flux density, and lower core loss at high frequencies (beyond ∼500 Hz in the present model motor) of steels used. In view of the high-efficiency core materials, it is desirable for them to have improved crystalline texture and perhaps smaller grain size in order to obtain lower alternating core loss, lower rotational core loss, and lower core loss at high frequencies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.338619
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Solubilization of oleyl alcohol by pure and mixtures of surfactants (1989)
    Springer
    Colloid & polymer science 267 (1989), S. 365-370 
    Details
    ISSN: 1435-1536
    Keywords: Solubilization ; amphotericsurfactant ; mixedsurfactantmicelles ; particlesize
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The solubilization behavior of oleyl alcohol by pure and mixtures of surfactants systems have been studied in terms of the maximum additive concentration (MAC), the solubilizing power, and the particle sizes of micelles with or without oleyl alcohol. The surfactants used are amphoteric (Nα,Nα-dimethyl-Nε-lauroyl lysine, DMLL; Nα,Nα,Nα-trimethyl-Nε-lauroyl lysine, TMLL; N,N-dimethyl-N-(carboxymethyl)-lauryl ammonium, DMCL), anionic (sodium dodecyl sulfate, SDS) and nonionic (alkyl polyoxyethylene ethers). The maximum additive concentration of oleyl alcohol by pure surfactants is larger by nonionic surfactants than by others. For a nonionic surfactant system mixed with DMLL, the mixing effect of surfactant on the increase in the MAC is not recognized. While, for DMLL mixed with SDS, the MAC becomes larger than that by pure surfactants. This may be attributed to the fact that the large micellar size will result in increasing the maximum additive concentration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01413631
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  • 8
    Electronic Resource
    Electronic Resource
    Pb1−x Bi x /Bi/Pb1−x Bi x Josephson junction (1988)
    Springer
    Journal of low temperature physics 73 (1988), S. 495-499 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A superconductor/semimetal/superconductor (S/SM/S) Josephson junction has been developed. We have used an alloy of Pb1−x Bi x (0≤x ≤ 0.6) as the superconductor and Bi as the semimetal. By irradiating at X-band microwave of 10 GHz, Shapiro steps were observed for various bismuth barrier thicknesses θ inÅ and bismuth weight ratiosx. Finally, we obtained the empirical relationship for barrier thickness, below which microwaves could be detected for various bismuth weight ratiosx at the temperature of 4.2 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00683576
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    Paper (German National Licenses)
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