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  • Electronic Resource  (3)
  • 1995-1999  (3)
  • 1
    Electronic Resource
    Electronic Resource
    Pre-equilibrium γ-ray emission in dissipative heavy-ion collisions (1995)
    Springer
    The European physical journal 352 (1995), S. 421-425 
    Details
    ISSN: 1434-601X
    Keywords: 25.70-z ; 24.30.Cz ; 25.70.Lm
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract γ-rays are measured in coincidence with the dissipative complex fragments from the35Cl +64Ni reaction at 7.7 A MeV. Theoretical γ-ray coincidence spectra are determined through a fitting procedure using the contribution of the excited fragment statistical γ-decay calculated by means of the CASCADE code. Whereas the expected statistical spectra fit very well the data in the energy regionE ν=2 to 8 MeV, above this energy another emission mechanism in addition to the statistical decay has to be considered in order to reproduce the experimental spectra. Simulations based on the Vlasov equation suggest that this emission could come from the decay of dipole strength excited in the intermediate dinuclear system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01299760
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Cyclic Traction Machine for Long-Term Culture of Fibroblast-Populated Collagen Gels (1999)
    Springer
    Annals of biomedical engineering 27 (1999), S. 67-72 
    Details
    ISSN: 1573-9686
    Keywords: Tissue engineering ; Collagen gels ; Fibroblasts ; Cyclic traction ; Traction machine ; Collagen fibers orientation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: Abstract Our research group has been investigating the effect of cyclic deformations on the evolution of fibroblast populated collagen gels (FPCG). Since existing traction machines are not designed for such an application, we had to design a cyclic traction machine adapted to tissue culture inside an incubator over an extended period of time. Biocompatible materials were used for fabrication to allow for easy sterilization and to prevent any adverse reaction from the tissue. The traction machine is based on a computer-controlled stepping motor system for easy adjustment of the deformation amplitude and frequency. The maximum stretching speed achieved is around 1mm/s. The traction machine can measure FPCG mechanical properties and perform rupture tests to determine its ultimate strength. Several FPCGs have been successfully cultured with the machine for up to four weeks without any adverse reaction. © 1999 Biomedical Engineering Society. PAC99: 8270Gg, 8380Lz
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1114/1.166
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Use of human vessels and human vascular smooth muscle cells in pharmacology (1996)
    Springer
    Cell biology and toxicology 12 (1996), S. 223-225 
    Details
    ISSN: 1573-6822
    Keywords: calcium handling ; human vessels ; phenotypic modulation ; signaling mechanisms ; vascular smooth muscle cells
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Relatively limited information is available regarding the mechanisms controlling vasomotricity in human vessels. Isolated vessels obtained from patients undergoing surgery were used to characterize the role of endothelial factors and to study coupling mechanisms between receptors, intracellular calcium, and contraction. However, these investigations are limited by the availability of tissues and many uncontrolled factors. Cultured human vascular cells were also used, were these cells rapidly lose at least some of their differentiated characters. Recently, a human blood vessel equivalent was constructed in vitro from cultured cells, using tissue engineering. This technique allowed us to obtain vessel equivalents containing intima, media, and adventitia layers or tubular media layer only. Contraction and rises in intracellular calcium produced by agonists were studied, indicating that such human vessel equivalents may provide valuable models for pharmacological studies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00438149
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    Paper (German National Licenses)
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