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81.
Cinzia Menapace Stefano Libardi Mirco D’Incau Alberto Molinari 《Journal of Materials Engineering and Performance》2010,19(4):533-540
Boron alloyed Fe-1.5%Mo alloys (B from 0.42 to 1.66%) were produced starting from a prealloyed ferrous powder and an elemental
boron powder, by mechanical alloying and spark plasma sintering. Near full density samples were obtained (density >99%) with
a nano- and ultrafine grained structure, consisting in a ferritic matrix with a fine dispersion of Fe and Mo borides. High
boron content and a low sintering temperature are favorable to minimize grain growth on sintering. On increasing the boron
content from 0.42% up to 1.66%, yield strength increases and ductility decreases; this effect is enhanced by the sintering
temperature because of the structural coarsening. Both ultrafine grained and nanostructured materials have a dimpled ductile
fracture. On increasing the crystallite size, a mixed dimpled-cleavage fracture is observed. 相似文献
82.
Ghisellini P Paternolli C Antonini M Nicolini C 《IEEE transactions on nanobioscience》2004,3(2):121-128
Molecular modeling and protein engineering were synergically employed to improve the fabrication of cytochrome P450scc mutant nanostructures for biodevice assembly. The optimization of protein three-dimensional structure by molecular modeling was performed using two models: in vacuum and simulating the presence of a polar solvent. Calculations were performed on a model to predict a P450scc mutant which could improve the process of molecules' immobilization onto solid supports. Engineerized cytochrome P450scc thin films were prepared and characterized by various biophysical techniques such as /spl pi/-A isotherms, surface potential measurements, Brewster angle microscopy, UV-vis spectroscopy, circular dichroism, nanogravimetry, and electrochemical analysis. This paper takes into consideration biomolecules modified by protein engineering that represent a new and powerful approach for obtaining synthetic simpler artificial structures with new or improved properties (i.e., specificity, stability, sensitivity, etc.) useful for biosensors development. 相似文献