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  • Denervation atrophy  (3)
  • 47.25.Q  (1)
  • 1
    ISSN: 1432-0533
    Keywords: Skeletal muscle ; Denervation atrophy ; Target fibres ; Analysis of size distribution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary An analysis of frequency distribution is performed in 250 target and targetoid fibres each from the anterior tibial muscle of a case with rapidly proceeding denervation atrophy. Following plane measurements on cross sections the size data were analysed according to the method of Daeves and Beckel [1] for mixed distributions. Three homogeneous normally distributed populations could thus be extracted from the mixed distributed sample. The largest population represents target fibres with a normal size range, while the second one encloses hypertrophic fibres, and the third and smallest one consists of fibres ranging within atrophic size limits. These findings support the previous presumption that targets predominantly occur in fibres of normal size and can therefore be regarded as manifestations of an early stage of denervation atrophy. The targetoid fibres, on the contrary, are of an atrophic size by 84%, while only a small population of about 15% contains targetoid fibres of a normal size on cross section.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Applied physics 52 (1991), S. 223-233 
    ISSN: 1432-0630
    Keywords: 44.25 ; 44.60+f ; 47.25.Q
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The temperature oscillation accompanying the photoacoustic effect generates a periodic variation of the vapor pressure of a liquid. The propagation of the oscillating concentration of the vapor in the inert cell gas (air) is described by a mass diffusion wave on which a convective motion of the gas is superposed. The diffusion wave characterized by the diffusion coefficient of the cell gas alone can be measured by the Mirage effect, whereas a microphone detects the total mass flux including the convective flux, which increases with temperature. On approaching the boiling temperature, the convective flow will govern the oscillating transport of mass. The photoacoustic signal is determined directly from the flux of heat and mass at the boundary between liquid and gas using the Gauss' divergence theorem. We have found that the temperature behaviour of the amplitude and phase angle of the photoacoustic signal depends on the length of the gas column in the cell. The contribution of thermal expansion to the photoacoustic signal is considered using the composite piston model. The results of the calculations agree fairly well with the experimental data.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Journal of neurology 210 (1975), S. 167-181 
    ISSN: 1432-1459
    Keywords: Denervation atrophy ; Target and targetoid/core fibers ; Pathogenetic relation ; Voluntary muscle ; Muscle pathology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Im M. tibialis anterior eines 68 Jahre alt gewordenen Mannes, der 1/2 Jahr vor seinem Tode am Herzinfarkt eine rasch progrediente neurogene Muskelatrophie in den Beinen entwickelte, fanden sich außerordentlich zahlreiche unifokal-konzentrische Muskelfaserveränderungen wie Target-, Targetoid/Core- und Targetoidfasern. Außerdem sah man große vacuolisierte Faserquerschnitte mit multiplen fokalen Veränderungen in der Randzone, die an die früher beschriebenen „cytoplasmic bodies“ erinnerten; im vorliegenden Zusammenhang wurden sie allerdings als Fasern mit multizentrischen Target- und Targetoidformationen interpretiert. Die Targetfasern zeigten eine weitläufige Variation in der äußeren Erscheinungsform, die in der Zusammenschau kontinuierliche Übergänge zu Targetoid/Corefasern (mit dichter Zentralzone) und Targetoidfasern (mit zentraler Auflösung und Vermehrung aquösen Sarkoplasmas mit wenigen fibrillären Strukturen) erkennen ließ. Wenige Fasern mit einer zentralen Verdichtung fibrillären Materials mit oder ohne schmaler Intermediärzone waren Corefasern des Central-Core-Disease auffallend ähnlich; andere glichen mehr dem Typ von Targetoidfasern mit strukturdichtem Zentrum, wie sie in der früheren Literatur beschrieben wurden. Beide Formen wurden wegen ihrer großen Ähnlichkeit von Engel et al. (1966) unter dem Begriff „Targetoid/Core Fibers“ zusammengefaßt. Das gleichzeitige Auftreten der verschiedenen Formen konzentrischer Faserveränderungen in einem Muskel legt die Annahme nahe, daß zwischen allen eine enge Beziehung im Sinne unterschiedlicher Manifestationsstufen des grundsätzlich gleichen pathogenetischen Prozesses besteht. So wäre unter dieser Annahme beispielsweise das Central-Core-Disease eine Erkrankung mit einer Generalisation konzentrischer Faserveränderungen, die im frühesten morphologischen Entwicklungsstadium zum Stillstand gekommen sind.
    Notes: Summary In the m. tibialis anterior of a 68-year-old man with rapidly developing denervation atrophy in the legs since 1/2 year prior to death from heart stroke, abundant unifocal concentric fiber changes, such as target, targetoid/core, and targetoid fibers could be observed. Besides, large vacuolized fibers with multiple changes resembling cytoplasmic bodies in the peripheral zone were present as well; they are interpreted as fibers with multicentric target or targetoid formations. The target fibers displayed a broad variation of their outer appearance suggesting a continuous transition to targetoid/core fibers (with a dense center) and targetoid fibers (with a central change to aquous sarcoplasm showing a paucity of fibrillar structures). Very few fibers with a central densification of fibrillar material with or without a thin intermediate zone were fairly akin to core fibers of central core disease; others were more alike the type of targetoid fibers, previously described in the literature, showing a dense target-like center; both were summarized under the term, inaugurated by Engel et al. (1966), “targetoid/core fibers”. Simultaneous occurence of the different kinds of concentric fiber changes suggested a strong relation between all of them in the sense of representing different developmental stages of the same pathogenetic process. Thus, the central core disease, for instance, might be a disorder with a generalization of concentric fiber changes having come to arrest in the earliest stage of development.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Journal of neurology 214 (1977), S. 159-162 
    ISSN: 1432-1459
    Keywords: Voluntary muscle ; Denervation atrophy ; Myopathy ; Target fibers ; Fiber splitting
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Zusammenfassung Faserspaltungsphänomene an Targetfasern in einem Fall von neurogener Muskelatrophie der Beine mit ausgeprägter Begleitmyopathie werden beschrieben und diskutiert. Erstmals wird das typisch myopathische Phänomen der Faserspaltung an für die neurogene Muskelatrophie als typisch erachteten Targetfasern dargestellt.
    Type of Medium: Electronic Resource
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