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  • 1975-1979  (2)
  • 1970-1974  (5)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of cancer research and clinical oncology 74 (1970), S. 344-348 
    ISSN: 1432-1335
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Die Scintigraphie ist eine Methode zur Erkennung und Lokalisation von Tumoren und Metastasen. Zur Verbesserung der Frühdiagnostik ist es wichtig, die Detailerkennbarkeit im Scintigramm weiter zu steigern. Eine geeignete Methode dafür ist die digitale Erfassung und Speicherung der scintigraphischen Meßdaten und die anschließende Filterung der digitalen Scintigramme mit Dekonvolutionsfiltern. Die Möglichkeiten dieser Methode zur Kontrastverstärkung bei Scintigrammen werden untersucht und diskutiert.
    Notes: Summary Scintigraphy is an important method for recognizing and localizing tumors and metastasis. To improve the method it is necessary to improve the recognition of details in the scintigrams. A suitable method for that purpose is the digital registration and storage of the data of the scintigram and the processing of the scintigram by deconvolution filters. The possibilities and limits of such a method for contrast enhancement in scintigrams are examined and discussed.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Journal of cancer research and clinical oncology 74 (1970), S. 349-354 
    ISSN: 1432-1335
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Seit kurzer Zeit steht für nuclearmedizinische Untersuchungen ein neues Detektorsystem, die Positronenkamera, zur Verfügung. Um dieses Kamerasystem einsetzen zu können, ist es notwendig, bei den Untersuchungen Radiopharmaka zu benutzen, die mit Positronenstrahlern markiert sind. Für die Hirnseintigraphie erschien uns der [Al18F6]3−-Komplex, dessen Pharmakokinetik wir in früheren Arbeiten eingehend untersucht haben, auf Grund seiner schnellen Gewebeclearance und seines dem [99TcmO4]1−-Komplex ähnlichen Verhaltens bezüglich der Bluthirnschrankenfunktion für die Hirntumordiagnostik geeignet zu sein. Erste vergleichende Untersuchungen bei Patienten mit Hirntumoren zeigten, daß diese Tumoren mit dem 18F-Komplex ähnlich gut nachgewiesen werden können wie mit 99Tcm-Pertechnetat. Damit sind die Voraussetzungen für eine Tomoscintigraphie des Gehirns mit der Positronenkamera gegeben.
    Notes: Summary A new detector system, the positron camera, has been recently introduced into Nuclear Medicine. For this camera system it is necessary to use in the examinations radiopharmaceutica, which are labelled with positron emitters. The [Al18F6]3−-complex, which we have examined in previous studies, seemed to be suitable for brain scintigraphy because it is cleared quickly from tissues and because its effect on the blood-brain-barrier is similar to that of the [99TcmO4]1−-complex. First comparative investigations with brain tumour patients showed that brain tumours can be detected as well with the 18F-complex as with the 99Tcm-complex. By using the 18F-compound with the positron camera tomoscintigraphy of the brain can be performed.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Journal of applied electrochemistry 4 (1974), S. 337-345 
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract The electrochemical behaviour of pure iron in alkaline sulphate solutions was studied using cyclic voltammetry atT = 298 K. It has been found that the results depend on the polarization pre-treatment of the electrode and the activation state of its surface. At starting potentials in the range of hydrogen evolution and at maximum activation conditions, the voltammograms show three anodic current maxima and two cathodic ones. A correlation between these different maxima is given. The electrode processes, which may take place at these maxima, are discussed in terms of possible iron dissolution mechanisms.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Journal of applied electrochemistry 9 (1979), S. 161-169 
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract The influence of underpotential Pb- and Tl-adsorbates at rotating disc silver single crystal surfaces (111), (100), and (110) on the kinetics of ‘outer-sphere’ and ‘inner-sphere’ redox reactions was studied in 0.5 M NaClO4 and 0.5 M Na2SO4 solutions (2 〈 pH 〈 4) containing Fe3+, Ce4+ or NO 3 − ions. While the reduction of Fe3+ and Ce4+ under limiting diffusion conditions was not affected by the metal adsorbates, a strong inhibition effect correlated to the degree of Pb- or Tl-adsorbate coverages was observed in the case of the reduction process in the presence of NO 3 − ions. The results are interpreted in terms of a strong chemical interaction between the reactant or a reaction intermediate and the silver substrate, taking into account the previously proposed superlattice structures of the metal adsorbates, depending on the orientation of the silver single crystal surfaces and on the underpotential range.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 29 (1978), S. 505-510 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Inhibition of the corrosion of iron in aqueous solutionsThe inhibition effect of propan(1,3)-biphosphonic acid and hexan (1,6)-biphosphonic acid on the corrosion of highly pure iron (polycrystalline, recrystallized) in aqueous sulfate solutions in the range 4 ≤pH ≤6 in presence and absence of oxygen has been studied at T = 298 K. Steady state and cyclic voltammetric measurements on rotating disc electrodes have been carried out. Both substances act as interface inhibitors. Their measured inhibition effects at the corrosion potentials are relatively low. The inhibition mechanism is discussed on the basis of kinetic data and the well known anodic iron dissolution mechanism.
    Notes: Die Inhibitionswirkungen von Propan(1,3)-biphosphonsäure und Hexan(1,6)-biphosphonsäure auf die Korrosion von hochreinem Eisen (polykristallin, rekristallisiert) in wäßrigen Sulfatlösungen im Bereich 4 ≤pH ≤6 in Abwesenheit und Gegen wart von Sauerstoff wurde bei T = 298 K untersucht. Es wurden stationäre und zyklisch voltammetrische Messungen an rotierenden Elektroden durchgeführt. Beide Substanzen wirken als Grenzflächeninhibitoren. Die erhaltenen Schutzwerte am Korrosionspotential sind jedoch verhältnismäßig gering. Der Wirkungsmechanismus der Inhibitoren wird anhand kinetischer Daten und des bekannten anodischen Eisenauflösungsmechanismus diskutiert.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 25 (1974), S. 86-92 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Influence of the metal substructure on the anodic dissolution mecanism of ironThe electrochemical behaviour of iron shows a pronounced dependence on the metal substructure. The surfaces formed at the rupture of the specimens are dissolved according to a non-catalytic mecanism while a heat treatment of these rupture surfaces produces a change in the mechanism so that the dissolution occurs according to a catalytic mechanism. The two mechanisms are characterized by a rather different dissolution potentials; these differences can be attributed to the state of deformation of the crystal latice.
    Notes: Das elektrochemische Verhalten von Eisen ist in ausgeprägtem Maße vom Metallsubgefüge abhängig. Die beim Bruch der Proben entstandenen Flächen werden nach einem nichtkatalytischen Mechanismus aufgelöst während eine Wärmebehandlung dieser Bruch-flächen zu einer Anderung des Mechanismus führt und die Auflösung dann katalytisch erfolgt. Die beiden Mechanismen sind durch stark unterschiedliche Auflösungspotentiale charakterisiert; diese Unterschiede können dem Verzerrungszustand des Kristallgitters zugeschrieben werden.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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