Search Results - (Author, Cooperation:A. Simionescu)

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  1. 1
    Staff View
    Publication Date:
    2014-11-05
    Publisher:
    Nature Publishing Group (NPG)
    Print ISSN:
    0028-0836
    Electronic ISSN:
    1476-4687
    Topics:
    Biology
    Chemistry and Pharmacology
    Medicine
    Natural Sciences in General
    Physics
    Published by:
    http://www.nature.com/

    Latest Papers from Table of Contents or Articles in Press
  2. 2
    N. Werner ; O. Urban ; A. Simionescu ; S. W. Allen
    Nature Publishing Group (NPG)
    Published 2013
    Staff View
    Publication Date:
    2013-11-01
    Publisher:
    Nature Publishing Group (NPG)
    Print ISSN:
    0028-0836
    Electronic ISSN:
    1476-4687
    Topics:
    Biology
    Chemistry and Pharmacology
    Medicine
    Natural Sciences in General
    Physics
    Published by:
    http://www.nature.com/

    Latest Papers from Table of Contents or Articles in Press
  3. 3
    J. P. Dietrich ; N. Werner ; D. Clowe ; A. Finoguenov ; T. Kitching ; L. Miller ; A. Simionescu
    Nature Publishing Group (NPG)
    Published 2012
    Staff View
    Publication Date:
    2012-07-06
    Publisher:
    Nature Publishing Group (NPG)
    Print ISSN:
    0028-0836
    Electronic ISSN:
    1476-4687
    Topics:
    Biology
    Chemistry and Pharmacology
    Medicine
    Natural Sciences in General
    Physics
    Published by:
    http://www.nature.com/

    Latest Papers from Table of Contents or Articles in Press
  4. 4
    J. S. Sanders ; A. C. Fabian ; E. Churazov ; A. A. Schekochihin ; A. Simionescu ; S. A. Walker ; N. Werner
    American Association for the Advancement of Science (AAAS)
    Published 2013
    Staff View
    Publication Date:
    2013-09-21
    Publisher:
    American Association for the Advancement of Science (AAAS)
    Print ISSN:
    0036-8075
    Electronic ISSN:
    1095-9203
    Topics:
    Biology
    Chemistry and Pharmacology
    Computer Science
    Medicine
    Natural Sciences in General
    Physics
    Published by:
    http://www.aaas.org/

    Latest Papers from Table of Contents or Articles in Press
  5. 5
    A. Simionescu ; S. W. Allen ; A. Mantz ; N. Werner ; Y. Takei ; R. G. Morris ; A. C. Fabian ; J. S. Sanders ; P. E. Nulsen ; M. R. George ; G. B. Taylor
    American Association for the Advancement of Science (AAAS)
    Published 2011
    Staff View
    Publication Date:
    2011-03-26
    Publisher:
    American Association for the Advancement of Science (AAAS)
    Print ISSN:
    0036-8075
    Electronic ISSN:
    1095-9203
    Topics:
    Biology
    Chemistry and Pharmacology
    Computer Science
    Medicine
    Natural Sciences in General
    Physics
    Published by:
    http://www.aaas.org/

    Latest Papers from Table of Contents or Articles in Press
  6. 6
    Hobler, G. ; Simionescu, A. ; Palmetshofer, L. ; Tian, C. ; Stingeder, G.

    [S.l.] : American Institute of Physics (AIP)
    Published 1995
    Staff View
    ISSN:
    1089-7550
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    Channeling implantations of 20 keV boron into silicon have been performed with doses between 1013 and 1016 cm−2 in the [100], [110], and [211] direction, and parallel to a (111) plane. Simulations using an empirical electronic stopping model agree very well with the experimental results. The model has been obtained considering a large number of random and channeling implantations published in the literature. It contains a nonlocal and an impact parameter dependent part with the nonlocal fraction increasing with energy. Moreover, a computationally efficient damage accumulation model is presented which takes point defect recombination into account. It is found that due to interactions within a recoil cascade only 1/8 of the generated damage is stable, and that damage saturation takes place at a concentration of 4×1021 cm−3. Comparison of simulations and experiments indicates that displaced atoms reside on random positions rather than on tetrahedral interstitial sites in the silicon lattice. © 1995 American Institute of Physics.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.358608

    Articles: DFG German National Licenses
  7. 7
    Simionescu, D. T. ; Deac, R. ; Simionescu, A.
    Springer
    Published 1994
    Staff View
    ISSN:
    1573-4838
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Medicine
    Technology
    Notes:
    The presence of intrinsic remnant extracellular-matrix degrading proteases in glutaraldehyde-treated bovine pericardium per se and in explanted bioprosthetic heart valves has been demonstrated recently by us. These enzymes were shown to degrade type I collagen and thus could contribute to a possible in vivo slow tissue degeneration in time. We have investigated the potential use of protease inhibitors for effective control of this degenerative process. Collagenase, trypsin and chondroitinase were inhibited in vitro by 0.5% glutaraldehyde to 10–20% of initial activity; these remnant activities could be further inhibited by their specific inhibitors suggesting that a combination of glutaraldehyde and a mixture of enzyme inhibitors could be applied to bovine pericardium. Analysis of glutaraldehyde-treated tissue extracts by gelatin zymography revealed the presence of at least four distinct enzyme species which were active towards a collagen substrate and were inhibited most effectively by ethylenediaminetetraacetic acid and thus could be included in the matrix-metallo-proteinase family. Bovine pericardial fragments that were treated with a combination of protease inhibitors and glutaraldehyde showed a reduced colagenolytic activity compared to glutaraldehyde alone; furthermore, upon implantation in the rat subcutaneous model the proteolytic activities found in these preparations were further reduced.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF00120369

    Articles: DFG German National Licenses