112,116 research outputs found
Transamidinase of Hog Kidney V Kinetic studies
No full textTransamidinase of hog kidney V kinetic studies
PROPENE/ETHENE-[1-13C] COPOLYMERIZATION AS A TOOL FOR INVESTIGATING CATALYST REGIOSELECTIVITY, 1 - THEORY AND CALIBRATION
No full textIn a previous letter, we proposed the synthesis and C-13 NMR characterization of propene/ethene-[1-C-13] copolymers at low ethene-[1-C-13] content as a convenient tool for measuring the regioselectivity of coordinated propene polyinsertion, in case 13C NMR fails to detect the regiomistakes in propene homopolymers. In the present article, we introduce the foundations of the approach in more detail, and illustrate how its scope can be extended to the evaluation of catalyst "dormancy" due to regiochemical monomer inversion. The method was calibrated for two well-known C-2-symmetric ansa-metallocene catalysts (namely, rac-Me2Si(1-indenyl)(2)ZrCl2 and rac-Me2Si(2-Me-4-phenyl-1-indenyl)(2)ZrCl2), by means of a cross-check with results of a C-13 NMR characterization of samples of poly(propene-[3-C-13]) prepared under corresponding experimental conditions. In particular, it was proved that the fraction of consecutive 2,1 insertions in propene homopolymerization promoted by the quoted catalysts, although nonzero, is low enough not to invalidate the propene/ethene-[1-C-13] copolymerization approach
Synthetic scaffolds: lights and shadows
No full textDefects of the skeletal system are an impediment to the normal function of the human organism. Problems still arise concerning the optimal therapy of bony defects after trauma or tumor resection. Today, biomaterials may be designed with the aim that once implanted they will help the body to heal itself. In particular, temporary matrices named scaffold with tailored morphological and functional properties may provide a specific environment and architecture able to promote the bone in-growth. Current work proposes a critical assessment of the most famous and recently used scaffold preparation strategies to emboss lights and shadows of the current bone regeneration in comparison with traditional approaches based on the tissue substitution
Positiones ex universa philosophia ac mathesi
No full textquas sub auspiciis ... domini Benedicti Pfiffer ab Altishofen exempti monasterii ad Sanctum Urbanum abbatis ... publice defendendas susceperunt R.R. F.F. Emmericus Mahler, & Xaverius Hecht eiusdem monasterii professi, praeside P. Antonio Ronca ibidem professo ... anno M D C C L X X V I I I die [26] aug.Diss., 177
Transamidinase of Hog kidney IV Effect of dinitrophenylation
No full textTransamidinase of hog kidney IV effect of dinitrophenylation
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