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  • 1
    Electronic Resource
    Electronic Resource
    The activity of the peroxide-metabolizing system in human colon carcinoma (1980)
    Springer
    Journal of cancer research and clinical oncology 97 (1980), S. 267-273 
    Details
    ISSN: 1432-1335
    Keywords: Colon carcinoma ; Lipid peroxidation ; Catalase ; Selenium ; Glutathione
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The major parameters of the peroxide-metabolizing system were investigated in eight human colon carcinoma excisions and compared with apparently non-neoplastic colon tissue from the same patients. The mean malondialdehyde level as an index of lipid peroxidation was 147 pmol/mg protein in carcinoma compared to 40 pmol/mg in healthy tissue. The following relations of specific activities in carcinoma and healthy tissue were found: superoxide dismutase 3.9 μg/mg protein (carcinoma): 2.4 μg/mg (healthy), glutathione peroxidase 23 mU/mg:10 mU/mg; GSH-transferase 38 mU/mg:25 mU/mg; catalase 2.3 mK/mg:4.1 mK/mg. The mean selenium concentration in carcinoma was 36 ng/mg protein compared to 24 ng/mg. The difference between carcinoma and normal tissue showed an overall-significance of p〈0.002 for the whole set of data. No significant differences were found in GSH levels (12.6 nmol/mg protein in carcinoma: 9.4 nmol/mg in normal colon), GSSG levels (0.6 nmol/mg:0.7 nmol/mg) and in the protein content (70±23.5 mg/g wet tissue: 66±20 mg/g). It is concluded that the enhanced lipid peroxidation in tumor tissue may be due to peroxisomally generated H2O2 in conjunction with a lowered catalase activity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00405778
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  • 2
    Electronic Resource
    Electronic Resource
    Screened Coulomb trajectory effects on inner shell ionization (1982)
    Springer
    The European physical journal 309 (1982), S. 13-18 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Electron screening effects influence the classical trajectory of the projectile. The influence of this effect on inner shell ionization probabilities is studied. We compare calculations with straight lines trajectories to trajectories in a screened and in an unscreened Coulomb potential. Rather simple prescriptions are found which allow to take the screening effects into account using “modified Coulomb trajectories”. Their accuracy is investigated and demonstrated for a number of representative examples.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01420145
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Semiclassical treatment of light-ion induced alignment of theL 3-subshell in heavy atoms (1982)
    Springer
    The European physical journal 304 (1982), S. 75-78 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Light ion induced alignment measurements ofL 3-subshell in heavy atoms are analyzed within the framework of the semiclassical theory of inner shell ionization. Coulomb deflection effects are exactly taken into account by hyperbolic classical orbits while the electron in the initial and final states is approximated by screened relativistic hydrogenic wave functions. Satisfactory agreement between experiments and theory is obtained for proton- and α-particle induced reactions within the whole region of bombarding energies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01432278
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  • 4
    Electronic Resource
    Electronic Resource
    Influence of the solvent matrix on the overlapping of the absorption and emission bands of solute fluorescent dyes (1980)
    Springer
    Applied physics 23 (1980), S. 369-372 
    Details
    ISSN: 1432-0630
    Keywords: 33 ; 61.40 ; 42.80
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract It has been observed that the separation between the absorption and the emission bands of a fluorescent dye is smaller in a rigid polymer matrix than in the liquid monomer. Low temperature measurements have been carried out in order to understand this phenomena. It has been found, that the molecular mobility of the matrix, in which the dye is dissolved, plays an important role. By doping the rigid matrix with molecules of high mobility, the separation between the absorption and emission bands can be increased. A nearly complete separation can be achieved by this doping method if the difference of the dipole moments in the ground and excited states of the dye molecules is very large. This allows, for example, to increase the brightness of the fluorescence-activated liquid-crystal display (FLAD) and the efficiency of solar collectors based on fluorescent dyes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00903218
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  • 5
    Electronic Resource
    Electronic Resource
    Effects of nuclear polarizability on isotope shifts in electronic atoms (1984)
    Springer
    The European physical journal 315 (1984), S. 57-63 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The isotope shift in electronic atoms is calculated in second order perturbation theory. We consider multipole ordersλ=0, 1 and 2 forZ=20–82 nuclei. To a good approximation it is directly proportional to the electron density at the nucleus. We study whether the polarization effect modifies the extraction ofδ〈r 2〉 values from isotope shifts measurements and find it to be small but not always negligible. Relative to the volume effect, the polarizability is of the same order of magnitude for electronic as well as muonic atoms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01436209
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  • 6
    Electronic Resource
    Electronic Resource
    Characteristic features of the matrix effect on the stokes shift of fluorescent dye molecules in pure and plasticized polymersCorrected proofs received March 23, 1983 (1983)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 28 (1983), S. 1819-1827 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The influence of the chemical structure, composition, and physical properties of polymers [polyacrylates and -methacrylates, poly(vinyl acetate), polystyrene, and polybutadiene] and plasticized polymers [poly(methyl methacrylate) and polystyrene] on the Stokes shift of fluorescent dyes has been investigated. The results indicate that the structure and overall mobility of the polymer matrix as well as the nature of the dopant all together influence the separation of the absorption and emission band of a given fluorescent dye. In general, polar and highly flexible polymers favor the band separation. The effect of both polar and apolar dopants seems to be primarily a plasticization in case of polar polymers, whereas for apolar polymers the plasticizer effect can be neglected and the increased Stokes shift upon addition of polar dopants has to be attributed to particular dopant/dye interactions. These findings open some new routes to improve the efficiency of solar collectors based on fluorescent dyes.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1983.070280601
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