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  • 1
    Electronic Resource
    Electronic Resource
    On the structure and stability of nanoscale materials: a two-dimensional model (1995)
    Springer
    The European physical journal 97 (1995), S. 503-510 
    Details
    ISSN: 1434-6036
    Keywords: 61.55.F
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have investigated numerically using the Metropolis Monte Carlo algorithm two-dimensional systems of about 3000 classical particles interacting via a Lennard-Jones potential and being subjected to periodic boundary conditions. In this model we consider metastable structures of small crystalline grains which are randomly oriented relative to each other and which are interconnected by a network of boundaries. The atomic structure within the grains being composed of about 500 atoms each is a nearly ideal triangular lattice. The network of boundaries however has a highly defective structure which is determined by the boundary conditions enforced by the crystalline grains. It is the objective of our work to develop a conceptually simple model for nanocrystalline materials, which can be used for a qualitative description of their complex properties. The main ingredient of the model is its property to relax into a metastable state consisting of intrinsically well ordered crystalline grains connected by a highly defective intergranular component. For that state we compute the static structure factor and the pair correlation function.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01322431
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  • 2
    Electronic Resource
    Electronic Resource
    Fast and sensitive chemiluminescence determination of H2O2 concentration in stimulated human neutrophils (1995)
    New York : Wiley-Blackwell
    Journal of Bioluminescence and Chemiluminescence 10 (1995), S. 229-237 
    Details
    ISSN: 0884-3996
    Keywords: Polymorphonuclear leukocytes ; hydrogen peroxide ; hypochlorous acid ; respiratory burst ; chemiluminescence ; luminol ; catalase ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: A fast and sensitive chemiluminescence assay for the determination of H2O2 in stimulated neutrophils without the use of enzymes was developed. The method is based on the oxidation of luminol by hypochlorous acid. The chemiluminescence of this reaction is highly dependent on the concentration of hydrogen peroxide.Changes in H2O2 concentration in PMA-stimulated neutrophils were followed by injection of NaOCI to cell suspension at different times after cell stimulation. The short integration time of 2 s permits calculation of actual concentrations of H2O2 without influence of H2O2 decomposition by cellular enzymes or newly produced H2O2 due to dismutation of superoxide anion radicals. Concentrations of H2O2 were diminished by catalase and enhanced by sodium azide owing to inhibition of cellular catalase and myeloperoxidase. Changes in H2O2 concentration upon stimulation could be observed at 3000 cell/mL.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bio.1170100406
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Chemiluminescence intensities and spectra of luminol oxidation by sodium hypochlorite in the presence of hydrogen peroxide (1991)
    New York : Wiley-Blackwell
    Journal of Bioluminescence and Chemiluminescence 6 (1991), S. 189-192 
    Details
    ISSN: 0884-3996
    Keywords: Luminol ; sodium hyochlorite ; hydrogen peroxide ; chemiluminescence intensities ; chemiluminescence spectra ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Hydrogen peroxide amplifies the chemiluminescence in the oxidation of luminol by sodium hypochlorite. A linear relationship between concentration of hydrogen peroxide and light intensity was found in the concentration range 5 × 10-8-7.5 × 10-6 mol/l. At 7.5 × 10-6 mol/l H2O2 the chemiluminescence is amplified 550 - fold. The chemiluminescence spectra of these reactions have a wavelength maximum at 431 nm independent of the concentration of hydrogen peroxide. The results indicate that hydrogen peroxide is a necessary component in the chemiluminescent oxidation of the luminol by sodium hypochlorite.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bio.1170060309
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  • 4
    Electronic Resource
    Electronic Resource
    Mechanisms of inhibition of chemiluminescence in the oxidation of luminol by sodium hypochlorite (1993)
    New York : Wiley-Blackwell
    Journal of Bioluminescence and Chemiluminescence 8 (1993), S. 307-313 
    Details
    ISSN: 0884-3996
    Keywords: Luminol ; sodium hypochlorite ; hydrogen peroxide ; inhibition of chemiluminescence ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Two different mechanisms of inhibition of chemiluminescence in the oxidation of luminol by sodium hypochlorite were found. Most substances investigated in these experiments acted by scavenging NaOCI. This mechanism was independent of the concentration of hydrogen peroxide and the incubation time between luminol and inhibitors. The most potent inhibitors were substances containing SH groups. Compounds with amino groups as a target for HOCI/OCI- to yield chloramines were much less effective inhibitors. Another mechanism of inhibition was found for catalase. It depended on the presence of hydrogen peroxide in the incubation medium and the incubation time between luminol and catalase. The enzyme inhibited the luminescence by removing H2O2 at molar concentrations much smaller than those found for all other inhibitors. Our results confirm the present models of the mechanism of generation of luminescence in luminol oxidation.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bio.1170080604
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