A Numerical Approach to Mechanosensation of Bone Tissue based on a Micromechanical Analysis of a Single Osteon

The subject of this work is to study the mechanosensation of bone tissue using a numerical approach. Therefore a finite element analysis of a single osteon was carried out. The calculated strains at the lacuna leads to a deeper insight into the mechanical conditions the osteocytes are exposed to. (© 2004 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)     

Neue Farbenreactionen einiger Alkaloide

Ohne Zusammenfassung     

In vivo EXCITATION OF PHOTOSENSITIZERS BY INFRARED LIGHT

Abstract— Use of near infrared instead of visible light would markedly improve tissue penetration, making larger tumors candidates for photochemotherapy. Because common photosensitizers exhibit virtually no absorption in this wavelength region, conditions are required where the simultaneous action of two photons is possible. Healthy tissue (rat ears), sensitized by hematoporphyrin derivative, sulfonated chloroaluminum phthalocyanine or pheophorbide a, was irradiated (1064 nm, 10 ns) with power densities up to 200 MW cm^-2 and total energy densities up to 200 kJ cm^-2. No reproducible photodynamic lesions were observed, but there was sensitizer fluorescence that depended quadratically on the excitation intensity.     

Zur Werthbestimmung der Drogen

Ohne Zusammenfassung     

Crystallinity of fully aromatic thermotropic polyesters of 3,3'-bis(phenyl)-4,4'-biphenol and 1,1'-binaphthyl-4,4'-diol

The degree of crystallinity of as-made fully aromatic, thermotropic polyesters was determined for two different series of polymers, each of which contained a symmetric monomer having either pendant phenyl groups or fused aromatic rings by the WAXD technique. All of the homopolymers had a high degree of crystallinity in spite of bulky substituents attached to the mesogenic moiety. Surprisingly, the homopolymer of 2,6-naphthalenedicarboxylic acid with each of the monomers had a higher degree of crystallinity and T_m than those of the homopolymer of terephthalic acid with each of the respective monomers. As expected, on copolymerization with 30 mol % of either 4-hydroxybenzoic acid or 6-hydroxy-2-naphthoic acid, all of the resulting copolymers had a much lower degree of crystallinity and T_m/T_f values compared to those of the respective homopolymers in each series. © 1994 John Wiley & Sons, Inc.