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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 97 (1993), S. 8250-8253 
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 57 (1979), S. 1209-1215 
    ISSN: 1432-1440
    Keywords: Pheochromocytoma localization ; Plasma catecholamines ; Adrenal phlebography ; Ultrasonography ; Computed tomography ; Phäochromocytomlokalisation ; Plasmakatecholamine ; Nebennierenphlebographie ; Sonographie ; Computer-Tomographie
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Bei sechs Patienten mit adrenalem Phäochromocytom erfolgte die Lokalisationsdiagnostik durch Ultraschalluntersuchung, Phlebographie der Nebennieren und selektiver Katecholaminbestimmung im Blut der Vena cava sowie der Nebennierenvenen. Durch die selektive Katecholaminbestimmung konnten alle Phäochromocytome lokalisiert werden, durch die Ultraschalluntersuchung fünf, durch die Phlebographie vier. Ein Phäochromocytom von 1,5 g Gewicht, das nur durch die selektive Katecholaminbe-stimmung, nicht aber durch Ultraschall oder Phlebographie lokalisiert wurde, konnte computertomographisch dargestellt werden. Um Fehldiagnosen bei der selektiven Katecholaminbestimmung zu vermeiden, darf vor der Blutentnahme aus den Nebennierenvenen kein Röntgenkontrastmittel injiziert werden, da dies zu einer erheblichen Adrenalin- oder Noradrenalinfreisetzung aus dem Nebennierenmark führen kann.
    Notes: Summary In six patients with adrenal pheochromocytoma the tumors were localized by ultrasonography, phlebography of the adrenal glands and by estimation of plasma catecholamines selectively obtained from the vena cava and the adrenal gland veins. All tumors were localized by selective catecholamine estimation, five by ultrasonography, and four by phlebography. The smallest pheochromocytoma of 1.5 g weight was only localized by selective catecholamine estimation but not by ultrasonography or phlebography. This tumor, however, had been visualized by computed tomography. To avoid diagnostic errors by selective catecholamine estimation, it is important to withdraw blood from the adrenal gland veins prior to the injection of any radiographic contrast media, since this may result in an extremely enhanced secretion of catecholamines from the adrenal medulla.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 34 (1996), S. 317-323 
    ISSN: 0887-6266
    Keywords: disorder controlled hopping ; hole transport ; poly(styrene)s ; triphenylamines ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Hole mobilities were measured in a series of triphenylamine (TPA) molecules with different dipole moments doped into apolar and highly polar poly(styrene)s. The results are described by a formalism based on disorder, due to Bässler and coworkers. The formalism is premised on the assumption that charge propagation occurs by hopping through a manifold of localized states with superimposed energetic and positional disorder. A key parameter of the formalism is the energy width of the hopping site manifold, or DOS. For the apolar poly(styrene), the width of the DOS increases with increasing dipole moment of the TPA molecule, whereas for the highly polar poly(styrene), the width is independent of the dipole moment. The results are explained by an argument based on dipolar disorder. The argument is premised on the assumption that the total width is determined by dipolar components due to the dopant molecule and the polymer repeat unit, and a van der Waals component. For the apolar poly(styrene), the width is determined by a TPA dipolar component that increases with increasing dipole moment of the TPA molecule and a van der Waals component of 0.077 eV. For the highly polar poly(styrene), the total dipolar component is 0.090 eV, independent of TPA dipole moment, and the van der Waals component 0.090 eV. © 1996 John Wiley & Sons, Inc.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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