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  • 1
    ISSN: 1432-1173
    Keywords: Schlüsselwörter Transitorische akantholytische Dermatose ; Morbus Grover ; Akantholyse ; Schwitzen ; Pruritus ; Key words Transient acantholytic dermatosis ; Grover's disease ; Acantholysis ; Sweating ; Pruritus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Background and objective. In 1970 Ralph W. Grover described a clinicopathologic entity characterized by pruritic keratotic papules and papulovesicles predominantly on the trunk, disappearing spontaneously after a few weeks or months and demonstrating the histological features of epidermal acantholysis. The etiology remains unknown; sweating, heat and sunlight are suspected trigger factors. In our survey the clinical spectrum of the disease will be examined. Patients and methods. We have analyzed 21 cases of Grover's disease histologically diagnosed in Berne in 1997 and 1998. Results. In most cases we observed isolated papules disseminated on the trunk. The predominant histological type was the Darier-type; presumably there is no correlation between histological type and clinical features. At the time of diagnosis the skin disorder had been present on average for 83 months. There was a strong association with sweating and heat. Topical steroids were successful in 50% of patients. Conclusions. Our 21 cases reflect in general the literature. Nevertheless, the long persistence of the skin lesions was striking perhaps making the term transient somewhat inaccurate.
    Notes: Zusammenfassung Hintergrund und Fragestellung. Bei der 1970 von Grover erstmals beschriebenen transitorischen akantholytischen Dermatose finden sich klinisch meist juckende, ödematöse oder hyperkeratotische Papeln oder Papulovesikel vorwiegend am Rumpf, die nach Wochen bis Monaten spontan abheilen. Histologisch typisch ist eine Akantholyse. Bei bis heute unklarer Ätiologie werden als Provokationsfaktoren Licht, Schwitzen und Hitze diskutiert. In unserer Arbeit soll das klinische Spektrum anhand eigener Fälle überprüft werden. Patienten und Methodik. In der vorliegenden Arbeit wurden 21 in unserer dermatohistopathologischen Abteilung als M. Grover erfasste Fälle auf ihr klinisches Spektrum untersucht. Ergebnisse. Als Hauptmorphe wurden einzeln stehende Papeln beobachtet, die disseminiert v. a. in den Schweißrinnen auftraten. Histologisch dominierte der Darier-Typ; ein Zusammenhang zwischen histologischem Typ und klinischem Bild ließ sich nicht herstellen. Die Hautveränderungen waren bei Diagnosestellung im Schnitt 83 Monate bekannt. Ein häufiger Zusammenhang bestand zu Hitze und Schwitzen. Topische Steroide führten in 50% der Fälle zu einer Abheilung oder Besserung. Schlussfolgerungen. Unsere Fälle reflektieren die in der Literatur bekannten Daten. Auffallend war die lange Persistenz der Hautveränderungen ohne spontane Abheilung, eine Beobachtung, die darauf hinweist, dass der Begriff “transitorisch” bei diese akantholytischen Dermatose überdacht werden sollte.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Physics and chemistry of minerals 26 (1999), S. 367-374 
    ISSN: 1432-2021
    Keywords: Key words Lead feldspar ; in situ HP powder diffraction ; Synchrotron radiation ; Bulk modulus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Abstract  An in situ high pressure powder diffraction study, using high-brilliance synchrotron radiation, on lead feldspar (PbAl2Si2O8) was performed. Two samples, with Q od=0.68 and 0.76, were loaded in a diamond anvil cell and were compressed up to 11 GPa. Up to P=7.1 GPa the only phase present is lead feldspar. In the range 7.1–9.4 GPa sudden changes in the position of the reflections suggest the transformation of lead feldspar to a new phase (probably feldspar-like). The absence of split that would be compatible with triclinic symmetry rules out the monoclinic-triclinic transition, that was reported for the structurally similar strontium feldspar. At P〉9.4 GPa some new extra reflections not indexable in the feldspar cell are present as well. During decompression the lead feldspar was the only phase present at P〈6 GPa. Peak enlargement was observed with pressure, probably preliminary to amorphization. However almost complete amorphization was observed only after fortuitous shock compression at ∼18 GPa; the crystallinity was recovered at room pressure after decompression. The bulk modulus for lead feldspar was K=71.0(9) and 67.6(1.2) GPa for the two samples, in the range reported for feldspars. The cell parameters show a compression pattern which is similar to that observed in anorthite, with Δa/a 0〉Δc/c 0〉Δb/b 0; comparison with the high temperature behaviour shows that for lead feldspar the strain tensor with pressure is more isotropic and the deformation along a is less prominent. A turnover in the behaviour of the β angle with pressure suggests a change in the compression behaviour at P∼2 GPa. Rietveld refinement of the Pb coordinates was performed in a series of spectra with pressure ranging from 0.6 to 6.5 GPa. The combined analysis of cell parameters and Pb coordinates with pressure showed that the compression of the structure is mainly achieved by an approach of Pb atoms along a *.
    Type of Medium: Electronic Resource
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