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  • 1
    Electronic Resource
    Electronic Resource
    Four different types of protease-activated receptors are widely expressed in the brain and are up-regulated in hippocampus by severe ischemia (2001)
    Oxford, UK : Blackwell Science Ltd
    European journal of neuroscience 14 (2001), S. 0 
    Details
    ISSN: 1460-9568
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: A variety of extracellular serine proteases are expressed in the central nervous system or might permeate the blood–brain barrier under pathological conditions. However, their intracerebral targets and physiological functions are largely unknown. Here, we show that four distinct subtypes of protease-activated receptors (PARs) are abundantly expressed in the adult rat brain and in organotypic hippocampal slice cultures. PAR-1 expression was significant in the hippocampus, cortex and amygdala. Highest densities of PAR-2 and PAR-3 were observed in hippocampus, cortex, amygdala, thalamus, hypothalamus and striatum. Apart from the striatum, a similar localization was found for PAR-4. Within the hippocampal formation, each PAR subtype was predominantly localized in the pyramidal cell layers. Additionally, we identified PAR-2 in mossy fibers between dentate gyrus and CA3, PAR-3 in the subiculum and PAR-4 in CA3 and in mossy fibres as well as in the stratum lacunosum moleculare. After exposing hippocampal slice cultures to a severe experimental ischemia (oxygen–glucose deprivation), the expression of PARs 1–3 was up-regulated with subtype-specific kinetics. The localization of PARs in brain regions particularly vulnerable to ischemic insults as well as distinct alterations in the expression pattern after experimental ischemia support the notion of an important role of extracellular serine proteases and PARs in cerebral ischemia.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.0953-816x.2001.01676.x
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of Polymer Crystallinity on Morphology in Ceramic Injection Molding (2001)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 84 (2001), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Many ceramic injection molding vehicles include semicrystalline polymers which characteristically adopt a spherulitic growth morphology. Usually the spherulites are rendered invisible by the opacity of the ceramic powder but in this study they are clearly visible. Polyoxymethylene (POM), has been used as the vehicle. The growth of the spherulites is shown to be dependent on cooling rate and hence on position in the molding. Furthermore, migration of low molecular weight additives by syneresis is shown to occur and to influence the crack path in the as-molded state. An unusual composite fractograph is shown in which fracture faces made after molding, after binder removal, and after sintering are contiguous. Only after molding does the crack path follow the spherulite boundaries; behavior that is also widely reported for unfilled POM.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.2001.tb01090.x
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  • 3
    Electronic Resource
    Electronic Resource
    Magnetic, electronic, dielectric and optical properties of Pr(Ca:Sr)MnO 3 (2001)
    Springer
    The European physical journal 20 (2001), S. 7-17 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 63.20.-e Phonons in crystal lattices – 71.30.+h Metal-insulator transitions and other electronic transitions – 72.60.+g Mixed conductivity and conductivity transitions – 78.30.-j Infrared and Raman spectra
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: The charge-ordered perovskite Pr0.65Ca0.28Sr0.07MnO3 was investigated by means of magnetic susceptibility, specific heat, dielectric and optical spectroscopy and electron-spin resonance techniques. Under moderate magnetic fields, the charge order melts yielding colossal magnetoresistance effects with changes of the resistivity over eleven orders of magnitude. The optical conductivity is studied from audio frequencies far into the visible spectral regime. Below the phonon modes hopping conductivity is detected. Beyond the phonon modes the optical conductivity is explained by polaronic excitations out of a bound state. ESR techniques yield detailed informations on the (H,T ) phase diagram and reveal a broadening of the linewidth which can be modeled in terms of activated polaron hopping.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100510170280
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  • 4
    Electronic Resource
    Electronic Resource
    Magnetic resonance on LiCuVO 4 (2001)
    Springer
    The European physical journal 22 (2001), S. 321-326 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 76.30.Fc Iron group (3d) ions and impurities (Ti-Cu) – 76.60.Es Relaxation effects – 75.30.-m Intrinsic properties of magnetically ordered materials
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: EPR and 7Li NMR measurements were performed in the distorted inverse spinel V(LiCu)O4 down to 1.5 K. Anisotropy effects on magnetic resonance spectra due to the Jahn-Teller distortion of the oxygen octahedra surrounding the copper ions are discussed. The estimation of the spin-spin interactions deduced from the EPR-relaxation rate Δ H reveals a situation comparable to the prototypical one-dimensional S = 1/2 Heisenberg antiferromagnet CuGeO3. Approaching three-dimensional antiferromagnetic order ( T N ≈ 2 K) from above, both magnetic relaxation rates, Δ H EPR and 7 (1/ T 1 ), respectively, exhibit nearly the same critical divergence reminding to the onset of three-dimensional order in two-dimensional layered systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100510170109
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