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  • 1
    ISSN: 1432-1440
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary An androgen producing tumour of the testis was removed from a boy with pseudopubertas praecox. Urinary excretion of total 17-oxosteroids, androsterone and aetiocholanolone, 11-oxy-17-oxosteroids (particularly 11β-hydroxy-androsterone), pregnandiol, pregnantriol and oestrogens were abnormally high before operation, and had decreased to normal after operation. After incubation of tumour slices with glucose alone androst-4-en-3,17-dione and 11β-hydroxyandrost-4-en-3,17-dione were found; after incubation with androst-4-en-3,17-dione: 11β-hydroxyandrost-4-en-3,17-dione, testosterone and adrenosterone, but no oestrogens were found; after incubation with desoxycorticosterone: corticosterone and 17α-hydroxycorticosterone. A large amount of androst-4-en-3,17-dione was found in Vena spermatica blood, as well as 17α-hydroxyprogesterone, 11β-hydroxyandrost-4-en-3,17-dione and testosterone. The biochemical and morphological aspects are discussed in relation to the clinical manifestations of the tumour. The tumour had the morphological appearance of a Leydig cell adenoma and also showed a high rate of androgen secretion. The finding of 11β-hydroxylase activity in the tumour shows that it possessed a characteristic usually found only in adrenocortical cells. The tumour was conceivably derived from atypical Leydig cells. This type of Leydig cell adenoma is compared with the bilateral tumour-like enlargement of the testis, which is ocassionally observed in congenital adrenogenital syndrome. The common and contrasting characteristics of the two growths are discussed.
    Notes: Zusammenfassung Bei einem Knaben mit einer Pseudopubertas praecox wurde ein androgenproduzierender Hodentumor entfernt. Präoperativ war die Harnausscheidung der gesamten 17-Ketosteroide, von Androsteron und Ätiocholanolon, der 11-Oxy-17-Ketosteroide, insbesondere von 11β-Hydroxy-androsteron, von Pregnandiol, Pregnantriol sowie der Oestrogene abnorm erhöht und fiel nach der Operation auf Normwerte ab. Nach Inkubation von Glucose allein mit Tumorschnitten wurden 11β-Hydroxy-Δ 4-androstendion undΔ 4-Androstendion gefunden, nach Inkubation vonΔ 4-Androstendion: 11β-Hydroxy-Δ 4-androstendion, Testoseron und Adrenosteron, jedoch keine Oestrogene, nach Inkubation von Desoxycorticosteron: Corticosteron und 17α-Hydroxy-desoxy-corticosteron. Im V. spermatica-Blut wurden große MengenΔ 4-Androstendion, ferner 17α-Hydroxy-progesteron, 11β-Hydroxy-Δ 4-androstendion und Testosteron nachgewiesen. Die biochemischen und morphologischen Gesichtspunkte sowie die klinischen Auswirkungen des Tumors werden diskutiert. Morphologisch hatte der Tumor den Aspekt eines Leydigzell-Adenoms. In Übereinstimmung hiermit wurde eine hohe Sekretion von Androgenen festgestellt. Durch den Nachweis einer 11β-Hydroxylase-Aktivität zeigte der Tumor jedoch gleichzeitig eine Eigenschaft, die sonst nur NNR-Zellen zukommt. Der Tumor wird vermutungsweise von atypischen Leydigzellen abgeleitet. Diese Art von Leydigzell-Adenom wird der beidseitigen tumorartigen Hodenvergrößerung, die gelegentlich beim angeb. adrenogenitalen Syndrom beobachtet wird, gegenübergestellt. Die gemeinsamen und unterschiedlichen Eigenschaften der beiden Wucherungen werden besprochen.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Sociology 7 (1981), S. 29-56 
    ISSN: 0360-0572
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Sociology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Journal of statistical physics 24 (1981), S. 607-616 
    ISSN: 1572-9613
    Keywords: RISM equation ; diatomic ; correlation functions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Using the solution of the RISM equation for diatomic symmetric molecules outlined in a previous paper, the site-site radial distribution function (RDF) is calculated and compared with the Monte Carlo results and the numerical RDF of Lowden and Chandler. The RDF calculated here and the numerical RDF of Lowden and Chandler agree well at intermediate and high densities. At low density, however, both have systematic errors. The agreement between the RDF calculated here and the Monte Carlo results suggests that a simplified formulation of the RISM solution may serve well as a reference system in a perturbation theory for diatomic fluids.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Journal of statistical physics 31 (1983), S. 129-140 
    ISSN: 1572-9613
    Keywords: Coulomb systems ; plasmas ; surface properties ; strip geometry ; correlations ; sum rules
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract This paper considers a strip of two-dimensional one-component plasma of particles of chargeq at a temperatureT such that the coupling constant be Γ=q2/kBT = 2. The strip is of finite width and infinite length and bears charge densities on either edge. Inside the strip and on one side, the dielectric constant is 1; on the other side of the strip, it may be either 1 or 0 (in the latter case, image forces play an important role). The free energy as well as the one-particle and two-particle distribution functions can be exactly computed. They obey a variety of sum rules reflecting the Coulombic behavior of the system. At large separations the truncated two-particle distribution function behaves with algebraically decaying oscillations. The strip of finite width in fact is correlated along the strip much as a one-dimensional system is correlated.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Journal of statistical physics 33 (1983), S. 13-22 
    ISSN: 1572-9613
    Keywords: Long-range order ; semiperiodic boundary conditions ; two-dimensional-one-component plasma
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The one-component two-dimensional plasma is studied in a strip of finite width, replicated periodically parallel to the long axis of the strip. Exact results for the one- and two-particle distribution functions are found at coupling Γ=q 2/kT =2. The system is inhomogeneous: the one- and two-particle distribution functions show long-range order.
    Type of Medium: Electronic Resource
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