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  • 1985-1989  (3)
  • Al oxides  (1)
  • Piper rhythm  (1)
  • Ultrastructure  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Ultrastructure of concentric laminations in primary human brain tumors (1986)
    Springer
    Acta neuropathologica 71 (1986), S. 83-87 
    Details
    ISSN: 1432-0533
    Keywords: Astrocytes ; Brain neoplasms ; Oligodendroglioma ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Ultrastructural concentric laminations have previously been thought to be specific to oligodendroglioma. However, these structures were also recognized in fibrillary astrocytomas, a mixed glioma and a glioblastoma. These laminations continued or closely related to attenuated processes or cytoplasm of astrocytic tumor cells. In addition, some lamellae contained glial filaments. It is considered that the concentric laminations are derived from attenuated astrocytic processes and have no relationship with myelin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00687966
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The role of aluminum and titanium on the oxidation process of a nickel-base superalloy in steam at 800°C (1987)
    Springer
    Oxidation of metals 27 (1987), S. 21-36 
    Details
    ISSN: 1573-4889
    Keywords: oxidation ; steam ; Ni-base superalloy ; Al oxides ; Ti oxides
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The role of aluminum and titanium on the oxidation process of a nickel-base superalloy containing 18.89%Cr, 2.13%Al, and 2.41%Ti was investigated in steam at 800°C. A Cr2O3-rich scale was formed on the alloy surface. Aluminum formed only internal oxides below the Cr2O3-rich scale. On the other hand, titanium formed not only internal oxides but also oxides in the scale and the granular particles of TiO2 outside the scale. Agglomeration of the TiO2 particles also occurred. The oxidation behavior of aluminum and titanium was discussed from thermodynamic and kinetics aspects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00656727
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Effect of muscle length on surface EMG wave forms in isometric contractions (1987)
    Springer
    European journal of applied physiology 56 (1987), S. 482-486 
    Details
    ISSN: 1439-6327
    Keywords: Surface EMG ; Muscle length ; Piper rhythm ; Isometric contraction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary To elucidate the influence of muscle length on surface EMG wave form, comparisons were made of surface EMGs of the biceps and triceps brachii muscles during isometric contractions at different muscle lengths. Muscle lengths were altered by setting the elbow joint angle at several intervals between the limits of extension and flexion. The intensity of the isometric contractions was 25% of maximum voluntary contraction at the individual joint angles. Slowing was obvious in the EMG wave forms of biceps as muscle length increased. The so-called ‘Piper rhythm’ appeared when the muscle was more than moderately lengthened. The slowing trend with muscle lengthening, though less marked, was also seen in triceps. Zero-cross analysis revealed quasi-linear relationships between muscle length and slowing. Frequency analysis confirmed the development of ‘Piper rhythm’. An attempt was made to interpret the slowing associated with muscle lengthening in terms of the propagation of myoelectric signals in muscle fibers. Given the effect of muscle length on EMG wave forms, a careful control of joint angle may be required in assessing local muscle fatigue when using EMG spectral indices.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00417780
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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