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  • 1
    ISSN: 1433-0563
    Keywords: Key words Erectile dysfunction • Medical history • Aetiology ; Schlüsselwörter Erektile Dysfunktion • Anamnese •Ätiologie
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Ätiologie und Ausmaß einer erektilen Dysfunktion (ED) bleiben auch mit invasiven Abklärungen oft unklar. Unabhängig von der Ätiologie sind die intrakavernöse Injektion vasoaktiver Substanzen und Vakuumpumpen sehr effiziente Behandlungsmethoden. Diese beiden Tatsachen und der Kostendruck begünstigen eine therapieorientierte Abklärung ohne ätiologische Diagnose. Es stellt sich die Frage, ob in einer quantifizierenden Anamnese trotzdem eine ätiologische Diagnose der ED möglich ist. Bei 74 nicht behandelten Patienten mit ED im Alter zwischen 25–75 Jahren wurden sexuell stimulierte Erektionen anamnestisch quantifiziert und mit duplexsonographisch und klinisch erhobenen Daten pharmakostimulierter Erektionen verglichen. Die Patienten beschrieben eine erhebliche Verschlechterung der Penetrationsfähigkeit, der Erektionsdauer und der Rigidität (p 〈 0,0001). Die duplexsonographisch gemessenen Parameter sowie die klinisch beurteilte Reaktion, korrelierten mit pharmakostimulierten Erektionen (r = 0,72). Der Vergleich dieser gemessenen Daten mit anamestisch quantifizierten, zeigte keine nachweisbare Relation (r = 0,05). Wurde aber die erektionsbedingte Volumenzunahme mit anamestisch quantifizierten (r = 0,26–0,34; p 〈 0,03) Daten und pharmakostimuliert (r = 0,44–0,55; p 〈 0,0001) gemessene Parameter verglichen, zeigten sich signifikante Korrelationen. Sexuell- und/oder pharmakostimulierte Erektionen sind proportional zur Volumenzunahme des Penis. Trotz nachweisbarer Beziehung zwischen sexuell- und pharmakostimulierten Erektionen reichen die quantitativen Angaben über sexuell stimulierte Erektionen nicht aus, um eine Ätiologie zu diagnostizieren und aufwendigere Abklärungen einzusparen.
    Notes: Summary Even complex diagnostic tests may not establish aetiology and degree of erectile dysfunction (ED) in many patients. Therefore, we evaluated a self-report method with a restrictive focus to quality of erections which may yield information sufficient to make an aetiologic diagnosis. We studied 74 patients 25 to 75 years of age with untreated ED. Sexually stimulated erections were quantified and compared to duplexsonographically and clinically evaluated data from pharmacostimulated erections. Patients reported that there was a marked decrease in ability to penetrate the partner, to sustain an erection and of penile rigidity (p 〈 0.001). Parameters from duplexsonography and clinically assessed response to pharmacostimulation correlated (r = 0.72). Direct comparison of these data with quantified history showed no relation (r = 0.05). Using change in penile volume due to erection as a basis to compare with, showed significant correlation with quantified data from history (r = 0.26–0.34; p 〈 0.03) and measured parameters from pharmacostimulated erections (r = 0.44–0.55; p 〈 0.0001). Sexually- and pharmacostimulated erections are proportional to change in penile volume. Although there is a relation between erections emerging from both stimulations, quantifying history on sexually stimulated erections does not qualify to make an aetiologic diagnosis without using complex tests.
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  • 2
    ISSN: 0392-6737
    Keywords: Theory
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Si dà un’analisi semi-fenomenologica degli effetti di certe caratteristiche di strutture di banda sui rapporti d’intervallo 2Δ/k B T c per conduttori ad altaT c che includono sistemi a molti intervalli. Oltre ai fononi si considerano altri bosoni intermedi (IB) che mediano l’interazione di superconduttività. Emergono interessanti risultati quando l’energia di IB eccede le ampiezze di possibili picchi stretti negli stati di densità associati a sub-bande presumibilmente appartenenti a substrutture come i piani Cu−O sovrapposti. Si fa il confronto con l’esperimento. In particolare, i dati ottenuti da Warneret al. attraverso il rilassamento dello spin nucleare su Ba2YCu3O7−δ possono essere interpretati entro l’attuale ambito in termini di un modello che ha un IB di energia ≳1 eV, che eccede l’ampiezza prevista (≾0.3 eV) di un picco negli stati di densità che contengono il livello di Fermi dello stato normale. Ciò suggerisce che il bosone intermedio non è un fonone.
    Abstract: Резюме Предлагается полуфеноменологический анализ влияния некоторых особенностей зонной структуры на отношения 2Δ/k B T c для высокотемператуных сверхпроводников, включая многощелевые системы. Кроме фононов, рассматриваются другие промежуточные бозоны, осуществляющие перенос сверхпроводящего взаимодействия. Получаются интересные результаты, когда энергия промежуточных бозонов превышает ширины возможных узких пиков в плотности состояний, связанных с подзонами, которые предположительно принадлежат субструктурам, таким как уложенным стопой плоскостям Cu−O. Проводится сравнение с экспериментом. В частности, ланные, полученные У ореном и др. На основе релаксации ядерного спина в Ba2YCu3O7−δ, могут быть интерпретированы в рамках предложенной модели, причем промежуточные бозоны имеют энергию ≳1 эВ, которая превышает предсказанную ширину (≿0.3 эВ) пика в плотности состояний. Это дает возможность предположить, что промежуточный бозон не является фононом.
    Notes: Summary A semi-phenomenological analysis is given of the effects of certain band structure features on the gap ratios 2Δ/k B T c for high-T c superconductors, including multigap systems. In addition to phonons other intermediate bosons (IB) mediating the superconducting interaction are considered. Interesting results emerge when the IB energy exceeds the widths of possible narrow peaks in the density of states associated with subbands presumably belonging to substructures such as stacked Cu−O planes. Comparison with experiment is made. In particular, data obtained by Warrenet al. via nuclear-spin relaxation on Ba2YCu3O7−δ can be interpreted within the present framework in terms of a model having an IB of energy ≳1 eV, which exceeds the predicted width (≲0.3 eV) of a peak in the density of states containing the normal-state Fermi level. This suggests that the IB is not a phonon.
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  • 3
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 55 (1989), S. 908-910 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Semiquantitative tests are considered of models, proposed earlier by this author, in which high Tc superconductivity follows from the exchange of unspecified intermediate bosons (IB) with ω(very-much-greater-than)ωphonon between fermionic pairs in different CuO2 layers. Earlier predictions of the dependence of Tc(n) on the number n of layers per cluster are extended to include the possibility that Tc(n=1)〈∼10 K in the Tl 1201 and 2201 compounds. In common with other authors rapid saturation of Tc(n) with increasing n is found here. Nonetheless, the experimental value of Tc(n=1) in the Tl and Bi systems can play an important role in discriminating between the various models empirically.
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  • 4
    ISSN: 0392-6737
    Keywords: Theory ; Errata
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
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