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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Environmental science & technology 11 (1977), S. 1138-1138 
    ISSN: 1520-5851
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of the American Chemical Society 98 (1976), S. 875-876 
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Analytical chemistry 48 (1976), S. 891-898 
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 56 (1978), S. 131-138 
    ISSN: 1432-1440
    Keywords: Sympathische Aktivität ; Plasma Noradrenalin ; Adrenalin ; Dopamin ; Gefäßreaktivität ; Uptake Aktivität ; Genetische Hypertonie ; Sympathetic activity ; Plasma noradrenaline ; Adrenaline ; Dopamine ; Vascular reactivity ; Uptake activity ; Spontaneous hypertension
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Differences in sympathetic vascular tone between Wistar Kyoto rats (WKR) and stroke prone spontaneously hypertensive rats (spSHR) were determined by comparing the following parameters: sympathetic activity was evaluated by determinations of plasma catecholamines (noradrenaline, adrenaline, dopamine) combined with the measurement of the neuronal and extraneuronal uptake of noradrenaline using an isolated rat heart preparation. The responsiveness of vascular smooth muscle to vasopressor agents was tested in the isolated perfused hindlimb preparation. At the age of 5, 12, 15, and 28 weeks sympathetic nervous activity was significantly higher in spSHR than in WKR since plasma noradrenaline was elevated by almost 50% in the presence of an unaltered activity of the uptake mechanisms. The responsiveness of vascular smooth muscle to noradrenaline was markedly enhanced in spSHR. Besides increased maximal vasoconstriction in response to BaCl2 (20 mmol/l) after potassium chloride depolarization or supramaximal doses of noradrenaline (10−3 mol/l), a supersensitivity of vascular smooth muscle to noradrenaline could also be detected in spSHR (age 5 weeks). The threshold dose and the ED50 were reduced by 25% in spSHR in response to noradrenaline infusions. No changes in threshold or ED50 were found in response to potassium chloride depolarization. The stimulated sympathetic activity in spSHR and the increased responsiveness of resistance vessels to noradrenaline, both contribute to the rise in sympathetic vascular tone. The finding of an increased sympathetic vascular tone in very early stages of hypertension suggest that this factor, producing a primary increase in total peripheral resistance underlies the development of high blood pressure in spSHR.
    Notes: Zusammenfassung Unterschiede des sympathischen Gefäßtonus zwischen spontan hypertonen Ratten (spSHR) und Wistar Kyoto Ratten (WKR) wurden an Hand folgender Größen erfaßt: Die sympathische Aktivität wurde ermittelt durch die Bestimmung der Plasmakatecholamine (Noradrenalin, Adrenalin und Dopamin) bei gleichzeitiger Messung der neuronalen und extraneuronalen Wiederaufnahme von Noradrenalin im isolierten Präparat (Langendorff Herz). Die Ansprechbarkeit glatter Gefäßmuskulatur auf vasopressorische Substanzen wurde in der isoliert perfundierten Hinterextremität der Ratte gemessen. Die sympathische Aktivität war bei spSHR im Alter von 5, 12, 15 und 28 Wochen gesteigert, da die Konzentration von Noradrenalin im Plasma um 50% bei unveränderter neuronaler und extraneuronaler Wiederaufnahme erhöht war. Die Ansprechbarkeit der glatten Gefäßmuskulatur gegenüber Noradrenalin war bei spSHR verstärkt. Neben einer stärkeren maximalen Vasokonstriktion nach supramaximalen Dosen von Noradrenalin (10−3 mol/l) oder BaCl2 (20 mmol/l) fand sich eine spezifische Überempfindlichkeit der einzelnen glatten Muskelzelle gegenüber Noradrenalin bei 5 Wochen alten spontan hypertonen Ratten. Während nach Kaliumdepolarisation keine Unterschiede in der Schwellendosis oder der ED50 auftraten, waren diese bei spSHR für die Noradrenalin-induzierten Widerstandserhöhungen um 25% vermindert. Die stimulierte sympathische Aktivität sowie die erhöhte Ansprechbarkeit der Widerstandsgefäße gegenüber Noradrenalin bei spSHR sind Ursache des gesteigerten sympathischen Gefäßtonus, der über eine Erhöhung des peripheren Widerstandes die Entwicklung des hohen Blutdrucks bei der genetischen Hypertonie der Ratte verursacht.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 114 (2001), S. 2698-2706 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: To explore how a structured excess charge distribution affects the hydration of an anion, we report mid-IR, argon predissociation spectra for the hydrated superoxide cluster anions, O2−⋅(H2O)n, 1≤n≤5. This size range was chosen to establish the evolution of the structures through the putative shell closing [Weber et al., Science 287, 2461 (2000)] for superoxide hydration at the tetrahydrate. Whereas the observed bonding motifs for n≤4 are those of single water molecules and dimeric subclusters bound to the ion, the pentahydrate spectrum displays strong bands in the region typically associated with ring modes of the water trimer. The present results reinforce the conclusion that the tetrahydrate adopts an especially robust structure in which each water molecule forms a single ionic H bond to one of the lobes of the π* highest occupied molecular orbital in superoxide. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 116 (2002), S. 6411-6421 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: An approach in which the total energy of interacting subsystems is expressed as a bifunctional depending explicitly on two functions: electron densities of the two molecules forming a complex (ρ1 and ρ2) was used to determine the equilibrium geometry and the binding energy of several weak intermolecular complexes involving carbazole and such atoms or molecules as Ne, Ar, CH4, CO, and N2. For these complexes, the experimental dissociation energies fall within the range from 0.48 to 2.06 kcal/mol. Since the effect of the intermolecular vibrations on the dissociation energy is rather small, the experimental measurements provide an excellent reference set. The obtained interaction energies are in a good agreement with experiment and are superior to the ones derived from conventional Kohn–Sham calculations. A detailed analysis of relative contribution of the terms which are expressed using approximate functionals (i.e., exchange-correlation Exc[ρ1+ρ2] and nonadditive kinetic energy Tsnad[ρ1,ρ2]=Ts[ρ1+ρ2]−Ts[ρ1]−Ts[ρ2]) is made. The nonvariational version of the applied formalism is also discussed. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 115 (2001), S. 10718-10723 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Photodetachment spectra of CH3NO2−⋅Arn clusters in the mid-IR are dominated by three strong resonances. These are assigned to autodetaching (AD) C–H stretching vibrational transitions in the valence (as opposed to dipole-bound) form of the molecular anion on the basis of a H/D isotopic substitution study and their solvation dependence. The AD resonances disappear promptly upon addition of the third argon atom, while the resonant structure appears in the action spectrum for formation of CH3NO2− photoproducts for n≥2. The strong argon solvation dependence of the photoproducts is traced to the rapidly changing endoergicity of the electron loss channel due to the differential solvation behavior of the valence anion relative to the neutral. We discuss a statistical limit for this competition, and introduce an intramolecular vibrational energy redistribution mediated AD mechanism unique to polyatomic anions. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Stem cell fate is influenced by specialized microenvironments that remain poorly defined in mammals. To explore the possibility that haematopoietic stem cells derive regulatory information from bone, accounting for the localization of haematopoiesis in bone marrow, we assessed mice that were ...
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 85 (2002), S. 0 
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Single-phase glasses containing 37.5 mol% Y2O3, 7 mol% La2O3, and 1 mol% Pr, Ho, Nd, Er, Sm, Tm, Eu, or Yb oxide substituted for part of the Y2O3 were synthesized by containerless melting. The spectral transmission and absorption cross sections of the glasses were determined at wavelengths from 360 to 3300 nm. The electronic transitions were broadened compared with results obtained in a crystalline yttrium aluminum garnet (YAG) host. The infrared transmission of the host glass extended to 6000 nm. The optical and physicochemical properties of these glasses are well suited for optical device applications.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Industrial and engineering chemistry 16 (1977), S. 113-119 
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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