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  • 1
    Electronic Resource
    Electronic Resource
    Charge phenomena induced by low-energy ion bombardment in SiO2 (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 65 (1989), S. 1683-1689 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In order to study the mechanisms of electrical charge creation in insulators under particle bombardment, we used different techniques: metastable atom deexcitation spectroscopy (MDS) and secondary ion mass spectroscopy (SIMS). SiO2 (quartz for MDS and a thin silica film for SIMS) was bombarded with a He* atom (MDS) and a He+ ion (SIMS). MDS involves neutralization of the incident atom, and SIMS involves a competition of two mechanisms: (i) neutralization through potential energy transfer, and (ii) a cascade of collisions through kinetic energy transfer. Under the He* metastable atom, the surface charges up positively; under the He+ ion, the initial potential on the surface is negative and slowly evolves towards a positive value, which is still under bombardment. On the basis of electron transfer models, we propose to explain the observed kinetics of charge under ions in three steps: (1) appearance of initial negative charge; (2) increase in the positive counterpart of the charge because of the neutralization of He+ with electrons trapped in the localized levels due to oxygen vacancies; (3) stabilization of the charge at a positive value because of the dominant character of the neutralization versus sputtering.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.343420
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  • 2
    Electronic Resource
    Electronic Resource
    Investigation of variable angle sample spinning (VASS) NMR of quadrupolar nuclei. I. Theory (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 86 (1987), S. 6070-6076 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Variable angle sample spinning NMR of quadrupolar nuclei in the solid state has been theoretically investigated in order to determine the optimal angles to achieve high-resolved and quantitative spectra. The earlier literature contributions have been included in a more general model. Complete analytical expressions were derived and are reported for all possible cases. It is concluded that magic angle spinning (at 54.7°) is to be used whenever the dipolar interactions and/or the chemical shift anisotropy dominate the spectra. For the other cases, θ=43.5° (which would allow an easy discrimination of the quadrupolar frequency and the asymmetry parameter), and θ=60°–70° (where the linewidth is half of that obtained for MAS conditions) are proposed as preferred spinning angles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.452446
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  • 3
    Electronic Resource
    Electronic Resource
    Magnesium enhances human pancreatic elastase digestion of125I-labeled elastin (1985)
    Springer
    Cellular and molecular life sciences 41 (1985), S. 628-631 
    Details
    ISSN: 1420-9071
    Keywords: Porcine and human pancreatic elastase ; elastin ; Triton-Mg++
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The effect of some divalent cations, especially Mg++, on elastinolysis by porcine or human pancreatic elastase has been determined using125Iodine-labeled elastin as substrate. Elastin degradation was significantly increased in the presence of 10−3 M Mg++. If elastin was pre-incubated with 0.5 (w/v) Triton, there was a further increase in elastinolysis to 2.6 times the original rate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02007692
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  • 4
    Electronic Resource
    Electronic Resource
    Inhibition of human pancreatic elastase II activity on human aortic elastin by human α2-macroglobulin (1986)
    Springer
    Cellular and molecular life sciences 42 (1986), S. 830-833 
    Details
    ISSN: 1420-9071
    Keywords: Pancreatic elastase II ; α2-macroglobulin ; aortic elastin ; human ; elastinolysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Human α2-macroglobulin-human pancreatic elastase II binding were investigated using a homologous substrate, human aortic elastin, in order to test the enzymatic activity. We demonstrated that two moles of α2-M are required to inhibit one mole of HPEII when the enzyme is added to a mixture of elastin and α2-M. In addition, when the elastase-α2-M complex is prepared under some circumstances, it exhibits an elastinolytic activity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01941542
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  • 5
    Electronic Resource
    Electronic Resource
    Repair of experimental arteriotomy in rabbit aorta using a new resorbable elastin - fibrin biomaterial (1989)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 23 (1989), S. 1423-1432 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: A new artificial connective matrix which results from two reactions of fibrinogen and fibronectin on elastin was used to obturate a slit made in the abdominal aorta of rabbit. The so-called Elastin - Fibrin biomaterial behaved as a scaffold through which all the different structures were restored to their former condition. At 3 months, the material had disappeared and no thrombus, no inflammation or reject had been detected.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jbm.820231205
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