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  • 1995-1999  (2)
  • Attenuation  (1)
  • Key words Poland syndrome – dextrocardia – situs solitus  (1)
  • Chemistry
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Surveys in geophysics 17 (1996), S. 347-360 
    ISSN: 1573-0956
    Keywords: Ultrasonic waves ; Attenuation ; Velocity ; Microstructure ; Thermal cracking ; Local fluid flow
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The frequency dependent mechanism of local fluid flow was found to be the decisive absorption and dispersion mechanism in fluid containing sandstones. In the ultrasonic frequency range local fluid flow and grain surface effects control the behaviour of highly porous and highly permeable rock if a pore fluid is present. Both mechanisms depend less on macroscopic rock parameters like porosity and permeability than essentially on microscopic parameters like crack size, crack density and grain contact properties. To demonstrate directly the important influence of the microstructure on the rock elastic and anelastic properties the microstructure of a sandstone was artificially changed by thermal cracking. The cracked rock exhibits a clearly changed behaviour at low uniaxial as well as at high hydrostatic pressure despite small changes of porosity and permeability. Fluid effects increase due to cracking. The experimental results are explained by means of a rock, model and local fluid flow. These results emphasize that it is the microstructure which controls the elastic and anelastic rock behaviour, even at high hydrostatic pressure.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Zeitschrift für Kardiologie 86 (1997), S. 639-643 
    ISSN: 1435-1285
    Keywords: Key words Poland syndrome – dextrocardia – situs solitus ; Schlüsselwörter Poland-Syndrom – Dextrokardie – Situs solitus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Poland syndrome consists of unilateral absence of the sternal head of the pectoralis major muscle, ipsilateral symbrachydaktylia, and occasionally associated other malformations of the anterior chest wall, mammilla, and mamma. To our knowledge a simultaneous occurrence with dextrocardia was reported in seven patients. We report on an additional patient with this unusual coincidence. A 59-year old man showed mild symbrachydaktylia of the left hand and deformity of the left part of the anterior chest wall, both present since birth. We found an additional dextrocardia with situs solitus, d-loop, and correctly connected great arteries. Besides arterial hypertension there was no remarkable impairment of the patient's condition.
    Notes: Zusammenfassung Das Poland-Syndrom ist gekennzeichnet durch eine einseitige Fehlbildung im Bereich der ventralen Thoraxwand mit Aplasie des sternokostalen Anteils des M. pectoralis major, eine ipsilaterale Symbrachydaktylie und gelegentlich assoziierte weitere Defekte der Thoraxwand, Mamille und Mamma. Nach unserer Kenntnis wurden bislang insgesamt sieben Fälle des gemeinsamen Auftretens einer Dextrokardie mit einem Poland-Syndrom beschrieben. Wir berichten über einen weiteren Patienten mit dieser seltenen kombinierten Fehlbildung. Bei einem 59jährigen Patienten bestanden seit Geburt eine linksseitige Thoraxdeformität sowie eine Symbrachydaktylie der linken Hand. Wir fanden bei Poland-Syndrom eine Dextrokardie bei Situs solitus, d-loop und korrekt verbundenen großen Arterien. Außer einer Hypertonie waren die Herzkreislauffunktionen nicht beeinträchtigt.
    Type of Medium: Electronic Resource
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