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  • 1990-1994  (5)
  • 1985-1989  (9)
  • 1990  (5)
  • 1987  (9)
  • 1
    Electronic Resource
    Electronic Resource
    Tracing of Neuronal Connections in the Human Brain by Magnetic Resonance Imaging in vivo (1990)
    Oxford, UK : Blackwell Publishing Ltd
    European journal of neuroscience 2 (1990), S. 0 
    Details
    ISSN: 1460-9568
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Axon degeneration after disruption of fibre tracts in the mammalian nervous system is accompanied by myelin breakdown which leads to changes in its magnetic resonance properties. In two patients with pure motor strokes due to small ischaemic lesions restricted to the internal capsule, magnetic resonance imaging disclosed a narrow band of pathological signal increase descending band-like into the brain stem and ascending to the precentral gyrus, which corresponded to the well-known path of the pyramidal tract. The findings suggest that in man anterograde and possibly retrograde fibre degeneration can be traced in vivo by conventional magnetic resonance imaging techniques. Critical conditions are the presence of small, strategically located lesions, appropriate choice of imaging plane, and the interval between time of lesion and of imaging. This demonstration may open a new era for functional neuroanatomy of man.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1460-9568.1990.tb00388.x
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  • 2
    Electronic Resource
    Electronic Resource
    Pharmakokinetik und Pharmakodynamik von Theophyllin bei multimorbiden geriatrischen Patienten (1987)
    Springer
    Journal of molecular medicine 65 (1987), S. 551-557 
    Details
    ISSN: 1432-1440
    Keywords: Theophylline ; Age ; Multimorbidity ; Pharmacokinetics ; Pharmacodynamics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The pharmacokinetics of theophylline (200 mg i.v.) were determined in 20 geriatric patients with multiple diseases. Serum concentrations were fitted to an open 2-compartment model. Percent changes in venous pCO2 and pO2 were used as parameters of the pharmacodynamic action. Total clearance was decreased and elimination half-life of theophylline was found to be prolonged in the elderly patients compared with data of a study with young healthy volunteers. The stronger the pharmacodynamic action of theophylline (percent change of venous pCO2 after 30 min), the faster was its elimination and the lower were measured concentrations after 2, 6, and 12 h.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01727621
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Vergleich von Perinealsonographie und lateraler Cystourethrographie im Rahmen der Harninkontinenzdiagnostik (1987)
    Springer
    Archives of gynecology and obstetrics 242 (1987), S. 87-88 
    Details
    ISSN: 1432-0711
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01783042
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  • 4
    Electronic Resource
    Electronic Resource
    Lokalrezidive nach Organerhaltung beim Mammakarzinom. Eine Analyse (1987)
    Springer
    Archives of gynecology and obstetrics 242 (1987), S. 312-313 
    Details
    ISSN: 1432-0711
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Zusammenfassung Die Häufigkeit lokaler Rezidive nach organerhaltender Behandlung des Mammakarzinoms war in unserem Kollektiv mit 3,8% gering bei einer mittleren Beobachtungszeit von 45 Monaten. Die Diagnostik des Lokalrezidives ist durch postoperative und radiatiobedingte Narbenfibrosen und Fibrosen sowie Verkalkungsstrukturen im Mammogramm erheblich erschwert. Hilfreich ist sicherlich die Tatsache, daß mammographisch entdeckte Primärtumoren zumeist auch eine radiologische Diagnostik des Rezidivs ermöglichen. Besonderes Augenmerk muß bei der Nachsorge auf das Tumorbett gerichtet werden, da sämtliche Lokalrezidive vom Tumorbett ihren Ausgang nahmen. Schließlich sind nicht sicher im Gesunden entfernte Tumoren und Patienten mit Lymphknotenbefall als Risikopatienten für Lokalrezidive anzusehen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01783127
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  • 5
    Electronic Resource
    Electronic Resource
    Modular transformations ofSU(N) affine characters and their commutant (1990)
    Springer
    Communications in mathematical physics 127 (1990), S. 617-636 
    Details
    ISSN: 1432-0916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract We describe the algebra of matrices commuting with the action of the modular group on characters ofSU(N) k integrable representations. Using methods of finite quantum mechanics we find a canonical basis for this commutant over ℂ and prove the existence of an equivalent basis over ℚ with integral matrix elements. A final section is devoted to the case ofSU(3).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02104506
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  • 6
    Electronic Resource
    Electronic Resource
    Faltenbiludung beim ebenen Torsionsversuch (1987)
    Springer
    Archive of applied mechanics 57 (1987), S. 39-50 
    Details
    ISSN: 1432-0681
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Summary The plane torsion test serves for determining stress-strain curves of thin sheet metal. When a torque is applied simple shear takes place in the free zone of the specimen and causes principal tensile and compressive stresses. Under certain material and geometrical conditions these compressive stresses may cause buckling of the sheet, so that the assumed state of plane stress and plane strain which enables test evaluation is no longer fulfilled. This limits the applicability of the test. By using the strain energy method the critical conditions for elastic and plastic buckling have been analysed and discussed in comparison with experimentally obtained data. A variation of parameters showed how geometry could be varied in order to decrease the tendency towards buckling.
    Notes: Übersicht Der ebene Torsionsversuch dient zur Aufnahme der Fließkurven dünner Bleche. Durch die Torsionsbelastung im ringförmigen nicht abgestützten Teil der Platine ergibt sich ein Zug-Druck-Hauptspannungszustand, der bei bestimmten Werkstoff- und Geometriegegebenheiten ein Ausknicken des Bleches aus der Ebene bewirkt. Hierdurch wird von den für die Auswertung des Versuches vorausgesetzten ebenen Formänderungs- und Spannungszuständen abgewichen und somit seine Anwendbarkeit begrenzt. Mit Hilfe der Formänderungs-Energie-Methode wurden die kritischen Bedingungen für elastische und plastische Faltenbildung berechnet und experimentellen Ergebnissen gegenübergestellt. Die durchgeführte Variation der Geometrieparameter gibt darüber Aufschluß, durch welche Veränderungen die Faltenbildung unterdrückt werden kann.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00536810
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  • 7
    Electronic Resource
    Electronic Resource
    Exclusive non-leptonic decays ofD-,D s - andB-mesons (1987)
    Springer
    The European physical journal 34 (1987), S. 103-115 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Recent experimental results onD-,D s - andB-decays are interpreted on the basis of the valence quark model. For nonleptonic decays generally good results are obtained using factorization with little direct annihilation. Final state interaction causes corrections, however: small bare amplitudes can be fed by stronger amplitudes through channel mixing. This effect can simulate or enhance weak annihilation processes in particular if high lying resonances contribute. A comparison of $$D^0 \to \bar K^0 \phi $$ withD s →ϱπ decays will clarify this issue. The effective QCD coefficients obtained in the analysis are discussed and used to estimate the contribution of two-body decays to the total widths. The result reflects already the lifetime differences betweenD 0 andD + mesons. Predictions for numerousB-decay branching rations allow for further tests and for a determination of so far unknown decay constants. A first bound on |V ub | from nonleptonic decays is found from the experimental limit on $$\bar B^0 \to \pi ^ + \pi ^ - $$ .
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01561122
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Effect of the nitrification inhibitors 1-amidino-2-thiourea and dicyandiamide in combination with urea and ammonium sulfate (1990)
    Springer
    Nutrient cycling in agroecosystems 21 (1990), S. 179-183 
    Details
    ISSN: 1573-0867
    Keywords: 1-amidino-2-thiourea ; dicyandiamide ; nitrification inhibitor ; urea ; ammonium sulfate ; N-fertilizer ; nitrate leaching
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The efficiency of the nitrification inhibitors dicyandiamide (DCD) and 1-amidino-2-thiourea (or guanylthiourea = GTU) in reducing losses from N fertilizers was investigated in two greenhouse experiments where leaching of nitrate-N was induced by percolation at 3 and 5 weeks after fertilization. At an application rate of 10% by weight of fertilizer-N (e.g. 10 kg GTU/ha), GTU in combination with ammonium sulfate (AS) had effects similar to those of DCD (e.g. 15 kg DCD/ha) with regard to nitrate leaching, plant yields and nitrogen uptake. However, in combination with urea (U), GTU was more effective than DCD when applied at the same ratio except with a humic sandy clay soil (pH 7.3, 4.4% organic C), where GTU did not perform as effectively. Nitrate leaching was reduced by as much as 50% using U/GTU instead of U/DCD, and plant yield increased by 30%. At temperatures between 17 and 25°C, the combination U/GTU could protect a high percentage of the nitrogen from being nitrified and leached over a 3 to 5 weeks period. The superiority of GTU over DCD was demonstrated especially in the treatments with 5 weeks of preincubation, despite the considerably lower application rate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01087429
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  • 9
    Electronic Resource
    Electronic Resource
    Monte-Carlo-Simulation der geometrischen Struktur von Cyanurat-Oligomeren (1987)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 38 (1987), S. 655-658 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: The average bond lengths and bond angles of the structural units of polycyanurates synthesized by polycyclotrimerization of 2,2-bis(4-cyanatophenyl)propane were measured by single crystal X-ray analysis of model compounds. An off-lattice Monte Carlo model was developed for the simulation of the geometrical structure of cyanurate oligomers with polymerization degrees up to 31. Excluded volume effects were taken into account in the form of hard spheres. The calculated results show that an occurrence of intramolecular cyclizations, which was supposed in the literature, is possible.
    Notes: Die Größen der Bindungsabstände und -winkel der in Polycyanuraten auf Basis von 2,2-Bis(4-cyanatophenyl)propan auftretenden Strukturelemente wurden durch Röntgenkristallstrukturanalyse von Modellsubstanzen ermittelt. Darauf aufbauend wurde ein Monte-Carlo off-lattice Modell zur Simulation der geometrischen Struktur auftretender Oligomere bis zu einem Polymerisationsgrad 31 entwickelt, in dem Effekte des ausgeschlossenen Volumens in Form von hard-sphere Potentialen berücksichtigt sind. Die Ergebnisse belegen unter anderem die aus experimentellen Daten resultierende Vermutung des Auftretens intramolekularer Cyclisierungen.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1987.010381204
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  • 10
    Electronic Resource
    Electronic Resource
    Kleben von Kunststoff mit Metall. Von W. BROCKMANN, L. DORN und H. KÄUFER. ISBN 3-540-19115-1. Berlin/Heidelberg/New York: Springer-Verlag 1989. X, 237 S., brosch., DM 98.00 (1990)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 41 (1990), S. 143-143 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1990.010410217
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