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Enea Bortolotti 《Monatshefte für Mathematik》1941,50(1):257-281
Ohne ZusammenfassungNach einem am 8. Jänner 1941 in Hamburg gehaltenen Vortrag. Mit 3 Figuren im Text 相似文献
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Paolo Bortolotti Vittorio Basso Alessandro Magni Giorgio Bertotti 《Journal of magnetism and magnetic materials》2010,322(9-12):1402-1404
Random-field Ising model (RFIM) systems are characterized by a large number of metastable states corresponding to local minima of the system energy with respect to single spin flip. We classified the minima in a hierarchical way based on the possibility of a given state to escape from a basin of mutually reachable states. We investigate the energy properties of the metastable states in relation to the basin they belong to: states of particularly high energy, obtained by fast-quenching randomly initial spin configurations, tend to have access to a complex structure of correlated basins, opposite to what is found for low-energy states. The purpose of this paper is to investigate the connection between the properties of the basin oriented graph and the energy of the corresponding states. 相似文献
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Bortolotti CA Battistuzzi G Borsari M Facci P Ranieri A Sola M 《Journal of the American Chemical Society》2006,128(16):5444-5451
Cyclic voltammetry experiments were carried out on native Saccharomyces cerevisiae iso-1-cytochrome c and its C102T/N62C variant immobilized on bare polycrystalline gold electrode through the S-Au bond formed by a surface cysteine. Experiments were carried out at different temperatures (5-65 degrees C) and pH values (1.5-7). The E degrees ' value at pH 7 (+370 mV vs SHE) is approximately 100 mV higher than that for the protein in solution. This difference is enthalpic in origin and is proposed to be the result of the electrostatic repulsion among the densely packed molecules onto the electrode surface. Two additional electrochemical waves are observed upon lowering the pH below 5 (E degrees ' = +182 mV) and 3 (E degrees ' = +71 mV), which are attributed to two conformers (referred to as "intermediate" and "acidic", respectively) featuring an altered heme axial ligation. This is the first determination of the reduction potential for low-pH conformers of cytochrome c in the absence of denaturants. Since the native form of cytochrome c can be restored, bringing back the pH to neutrality, the possibility offered by this transition to reversibly modulate the redox potential of cytochrome c is appealing for bioelectronic applications. The immobilized C102T/N62C variant, which differs from the native protein in the orientation of the heme group with respect to the electrode, shows very similar reduction thermodynamics. For both species, the rate constant for electron transfer between the heme and the electrode increases for the acidic conformer, which is also found to act as a biocatalytic interface for dioxygen reduction. 相似文献
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Ettore Bortolotti 《Monatshefte für Mathematik》1939,48(1):457-486
Mit 23 Figuren im Text. 相似文献
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Enea Bortolotti 《Annali di Matematica Pura ed Applicata》1940,19(1):315-325
Sunto. Osservazioni, ragguagli, notizie su precedenti lavori concernenti le superficie anolonome e le quadriche diMoutard per esse; ulteriori sviluppi concernenti gli intorni del3
o
e del4
o
ordine di un punto su di una superficie anolonoma. 相似文献
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