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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
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 84 (1986), S. 6940-6942 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We report molecular dynamics simulations of n-butane at the B1 state point of Ryckaert and Bellemans [Chem. Phys. Lett. 30, 23 (1975); Discuss. Chem. Soc. 6, 695 (1978)]. The results confirm those of Edberg et al. (preceding paper) in that we found 58.5±1.0% of the molecules in the trans state as opposed to the value of 54% reported by Ryckaert and Bellemans.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Physical Chemistry 37 (1986), S. 245-270 
    ISSN: 0066-426X
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Journal of statistical physics 43 (1986), S. 621-643 
    ISSN: 1572-9613
    Keywords: Wetting transition ; exact solution ; random walk ; S.O.S. model
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A model of a binary mixture, showing a wetting transition, is examined. No prewetting phenomena are found. The scaling functions are obtained for the film thickness and for the correlation lengths.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Journal of statistical physics 46 (1987), S. 179-190 
    ISSN: 1572-9613
    Keywords: Dipoles ; boundary conditions ; electrostatics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A microscopic derivation using the average Maxwell electric field is given for fluctuation formulas for the dielectric constant of a simulation sample for both periodic and reaction field boundary conditions. The reaction field case is for a spherical cavity reaction field. The derivations put both boundary conditions on an equal footing of microscopic theory and the only nonrigorous part of the derivation is the assumption that the region used to average the electric field is large enough. The fluctuation formula for reaction field boundary conditions is rather different from that used heretofore. The method is applied to a subregion of an isolated spherical system.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Journal of statistical physics 50 (1988), S. 813-838 
    ISSN: 1572-9613
    Keywords: Spherical model ; Coulombic systems ; correlation function decay ; Stillinger-Lovett relations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We consider simple cubic lattice systemsΛ ind dimensions with a continuous real charge variableq(n) at each lattice siten. These variables are subject t'o a mean spherical constraint forcing 〈∑n∈Λ q 2(n)〉=‖Λ‖Q 2, where ‖Λ‖ is the number of lattice sites inΛ andQ is an elementary charge. The energy of the charges comes from interactions with an electrostatic potential, which is the solution of a symmetric second-difference Poisson equation on the lattice. Two cases are considered, both of which allow the inclusion of the effects of a fixed, constant, external electric field. On the latticeΛ 1=[1,N]⊗d , a Neumann condition is imposed at the surface of the lattice. The latticeΛ 2=[1,N]⊗ [−M,M]⊗(d−1) is periodic in each direction ranging over [−M, M] and has a Dirichlet condition imposed at the other two surfaces. OnΛ 2 a finite electric field may be applied, while onΛ 2 a finite potential difference may be applied across the lattice. The models are exactly solvable. We study the distribution functions on each system and show that they satisfy appropriate forms of the first two Stillinger-Lovett moment conditions. The two charge distribution functions show screening behavior at high temperature and extreme short range at an intermediate temperatureT 0(d), and oscillate as they decay to zero forT〈T 0(d). Because of the continuous nature of the charge variables, there is no Kosterlitz-Thouless transition in two dimensions. In three dimensions the change in the decay behavior of the distribution functions atT〈T 0(d) is precursor to a phase transition to a charge ordered state.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Journal of statistical physics 55 (1989), S. 127-139 
    ISSN: 1572-9613
    Keywords: Spherical model ; Coulombic systems ; correlation function decay ; surface properties
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Studies of the mean spherical model with Coulomb interactions are continued, by considering a system on ad-dimensional lattice which is periodic ind−1 dimensions and has a free surface in the remaining dimension. It is shown explicitly that correlations along the free surface decay asy −d ind dimensions and show that the surface properties of this model are those expected for a charged system in its plasma phase.
    Type of Medium: Electronic Resource
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