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  • 1
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 5034-5036 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Structural, magnetic, and thermal measurements are carried out on the La0.67Ca0.33Mn1−xZnxO3 system with x=0.0–0.50. The structural characterization of the samples is done by Rietveld analysis of their neutron diffraction patterns. Zn substitutes at Mn site isostructurally until x=0.30. Oxygen content remains nearly invariant with x. Magnetic and thermal measurements as well as the electrical resistance show a para- to-ferromagnetic transition at Tp, which decreases with an increase of x. For low Zn concentration (until x=0.075) the decrease dTp/dx is smaller than for the larger concentrations of Zn. Relative decrease dTp/dx at higher concentrations (x〉0.10) is similar to that observed earlier for the La0.67Ca0.33Mn1−xFexO3 system. For the transition at Tp, the related change of magnetic entropy (ΔStrs) are calculated from the heat capacity data and indicate that for x=0 the expected value ΔStrs=12.8 J/mol K is recovered. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Archives of orthopaedic and trauma surgery 120 (2000), S. 544-547 
    ISSN: 1434-3916
    Keywords: Key words Spinal tumors ; Chondroblastoma ; Recurrence
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract A very rare case of recurrent chondroblastoma of the upper thoracic spine with a follow-up of more than 20 years is presented and discussed with a review of the literature.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Acta neurochirurgica 53 (1980), S. 79-85 
    ISSN: 0942-0940
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The authors describe a case of intraorbital schwannoma. The tumour caused exophthalmos of 11 mm, and displacement with limitation of mobility of the eyeball. A review of cases from other studies is presented. This rare tumour orginates from the fifth cranial nerve. Exophthalmos is the primary clinical symptom. The value of several radiological examination techniques and possible surgical approaches are discussed.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    European archives of oto-rhino-laryngology and head & neck 227 (1980), S. 483-487 
    ISSN: 1434-4726
    Keywords: Cerebellar tumor ; Balance disturbances ; Pendulum test ; Electro-oculographic technique ; Kleinhirntumor ; Gleichgewichtsstörungen ; Pendeltest ; Augenfolgebewegungen ; Elektro-Okulographie
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Pendelfolgebewegungen der Augen wurden bei Patienten mit Kleinhirntumoren elektro-okulographisch registriert. Die dabei festgestellten Störungen der Führungsbewegungen der Augen korrelierten mit dem Schweregrad der übrigen neurologischen Ausfallserscheinungen und waren bereits in Fällen dezenter cerebellärer Symptomatik deutlich pathologisch. Für die Diagnostik von Gleichgewichtsstörungen ist diese Untersuchungsmethode eine wertvolle Bereicherung, da sie frühzeitig auf eine cerebelläre Ursache der Beschwerden hinweisen kann und ohne großen apparativen und zeitlichen Aufwand durchführbar ist.
    Notes: Summary Smooth pursuit eye movements were studied in patients with cerebellar tumors. Patients were required to follow the motion of a pendulum whilst eye movements were recorded by an electro-oculographic technique. Disorders of eye movements correlated with other neurological signs and were clearly pathological even in cases with minimal cerebellar symptoms. This technique is a useful advance in the diagnosis of balance disturbances, because it may give an early indication of a cerebellar disease, without complex equipment or great expense of time.
    Type of Medium: Electronic Resource
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