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  • 1
    Electronic Resource
    Electronic Resource
    Overexpression of plant histidinol dehydrogenase using a baculovirus expression vector system
    Amsterdam : Elsevier
    Archives of Biochemistry and Biophysics 295 (1992), S. 235-239 
    Details
    ISSN: 0003-9861
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0003-9861(92)90512-U
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  • 2
    Electronic Resource
    Electronic Resource
    Steady-State Kinetics of Cabbage Histidinol Dehydrogenase
    Amsterdam : Elsevier
    Archives of Biochemistry and Biophysics 312 (1994), S. 493-500 
    Details
    ISSN: 0003-9861
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1006/abbi.1994.1337
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  • 3
    Electronic Resource
    Electronic Resource
    Simple versus cooperative relaxations in complex correlated systems (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 89 (2001), S. 1844-1849 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A method for investigating the nature of thermally activated relaxations in terms of their cooperative character is tested in both polymer and low molecular weight crystal systems. This approach is based on analysis of the activation entropy in order to describe thermally activated relaxations. The betaine arsenate/phosphate mixed system of low molecular weight crystals was selected for investigation because pure compounds of this system show ferro-/antiferroelectric phase transitions and the mixed crystals undergo different kinds of relaxation processes involving both dipole–dipole and dipole–lattice interactions. The polymer chosen was a side chain liquid-crystalline polysiloxane, which shows the β-relaxation characteristic of disordered systems and amorphous materials. The cooperative versus local character of the relaxations is described in terms of "complex" and "simple" relaxations based on calculations of the activation entropies. The initial assumptions of the theory, as well as the resulting equations, were found to be applicable to the systems studied. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1334937
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  • 4
    Electronic Resource
    Electronic Resource
    Dynamic mechanical properties of hydroxyapatite-reinforced and porous starch-based degradable biomaterials (1999)
    Springer
    Journal of materials science 10 (1999), S. 857-862 
    Details
    ISSN: 1573-4838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: Abstract It has been shown that blends of starch with a poly(ethylene-vinyl-alcohol) copolymer, EVOH, designated as SEVA-C, present an interesting combination of mechanical, degradation and biocompatible properties, specially when filled with hydroxyapatite (HA). Consequently, they may find a range of applications in the biomaterials field. This work evaluated the influence of HA fillers and of blowing agents (used to produce porous architectures) over the viscoelastic properties of SEVA-C polymers, as seen by dynamic mechanical analysis (DMA), in order to speculate on their performances when withstanding cyclic loading in the body. The composite materials presented a promising performance under dynamic mechanical solicitation conditions. Two relaxations were found being attributed to the starch and EVOH phases. The EVOH relaxation process may be very useful in vivo improving the implants performance under cyclic loading. DMA results also showed that it is possible to produce SEVA-C compact surface/porous core architectures with a mechanical performance similar to that of SEVA-C dense materials. This may allow for the use of these materials as bone replacements or scaffolds that must withstand loads when implanted.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008916901009
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  • 5
    Electronic Resource
    Electronic Resource
    Corrosions expérimentales de cristaux de zircons et comparaison avec des corrosions naturelles de zircons de granites albitisés (1974)
    Springer
    Mineralogy and petrology 21 (1974), S. 33-46 
    Details
    ISSN: 1438-1168
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Description / Table of Contents: Summary The comparative study of natural zircons which were experimentally corroded by hydrothermal treatment, and of zircons isolated from an albitized granite allow to show the respective roles which are played in the corrosion of this mineral by some internal (state of crystallization) or external factors (chemical nature of the environment, temperature).
    Notes: Résumé L'étude comparée de zircons naturels, corrodés expérimentalement par voie hydrothermale et de zircons extraits d'un granite albitisé permet de mettre en évidence les rôles respectifs joués dans la corrosion de ce minéral par certains facteurs interne (état cristallin) ou externes (nature du milieu chimique environnant, temperature).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01084949
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  • 6
    Electronic Resource
    Electronic Resource
    Synthesis, structure, thermal and non-linear optical properties of L-argininium hydrogen selenite (2001)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 57 (2001), S. 828-832 
    Details
    ISSN: 1600-5740
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: L-Argininium hydrogen selenite (C6H15N4O2HSeO3) is a new semiorganic compound of the hydrogen selenite family with non-linear optical properties. The crystal lattice is monoclinic with unit-cell parameters a = 22.493 (5), b = 5.1624 (13), c = 9.730 (4) Å, β = 95.68 (3)°, V = 1124.3 (6) Å3, Z = 4, space group C2. Second-harmonic generation measurements performed on powder samples, using a Q-switched Nd:Yag laser (λ = 1064 nm), showed the second-harmonic power to be about twice that of urea. Differential scanning calorimetry measurements revealed the existence of a phase transition with onset at 289 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108768101009880
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  • 7
    Electronic Resource
    Electronic Resource
    The molecular relaxation mechanisms in cork as studied by thermally stimulated discharge currents (1995)
    Springer
    Journal of materials science 30 (1995), S. 2035-2041 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The dielectric relaxation mechanisms present in cork have been investigated in the temperature range -100 to 100 °C using the technique of thermally stimulated discharge currents. A relaxation mechanism was detected which showed a compensation behaviour as observed for the α-relaxation (or glass transition relaxation) of synthetic polymers and which lead us to attribute to cork a glass transition-like temperature of 18 °C. One lower temperature mechanism was also observed, with low activation enthalpy and entropy, which is presumably originated by local motions (internal rotations) of polar molecular groups. An upper T g relaxation of higher intensity was also detected which was attributed to large-scale non-cooperative motions of polymeric segments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00353030
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