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排序方式: 共有109条查询结果,搜索用时 15 毫秒
1.
Alzate Manuela Gamba Oscar Daza Carlos Santamaria Alexander Gallego Jaime 《Journal of Thermal Analysis and Calorimetry》2022,147(22):12355-12363
Journal of Thermal Analysis and Calorimetry - Nanomaterials and nanocomposites have gained relevance in science and technology due to their excellent properties. Therefore, the characterization of... 相似文献
2.
Dr. Ilaria Gamba Iria Salvadó Gustavo Rama Miriam Bertazzon Mateo I. Sánchez Prof. Víctor M. Sánchez‐Pedregal Prof. José Martínez‐Costas Rosa F. Brissos Prof. Patrick Gamez Prof. José L. Mascareñas Prof. Miguel Vázquez López Prof. M. Eugenio Vázquez 《Chemistry (Weinheim an der Bergstrasse, Germany)》2013,19(40):13369-13375
A new bipyridine building block has been used for the solid‐phase synthesis of dinuclear DNA‐binding ruthenium(II) metallopeptides. Detailed spectroscopic studies suggest that these compounds bind to the DNA by insertion into the DNA minor groove. Moreover, the potential of the solid‐phase peptide synthesis approach is demonstrated by the straightforward synthesis of an octaarginine derivative that shows effective cellular internalization and cytotoxicity linked with strong DNA interaction, as evidenced by steady‐state fluorescence spectroscopy and AFM studies. 相似文献
3.
Dr. Carmen E. Castillo Dr. Ilaria Gamba Laia Vicens Dr. Martin Clémancey Prof. Dr. Jean-Marc Latour Prof. Dr. Miquel Costas Prof. Dr. Manuel G. Basallote 《Chemistry (Weinheim an der Bergstrasse, Germany)》2021,27(15):4946-4954
Oxoiron(IV) complexes bearing tetradentate ligands have been extensively studied as models for the active oxidants in non-heme iron-dependent enzymes. These species are commonly generated by oxidation of their ferrous precursors. The mechanisms of these reactions have seldom been investigated. In this work, the reaction kinetics of complexes [FeII(CH3CN)2L](SbF6)2 ( [1](SbF6)2 and [2](SbF6)2 ) and [FeII(CF3SO3)2L] ( [1](OTf)2 and [2](OTf)2 ( 1 , L=Me,HPytacn; 2 , L=nP,HPytacn; R,R′Pytacn=1-[(6-R′-2-pyridyl)methyl]-4,7- di-R-1,4,7-triazacyclononane) with Bu4NIO4 to form the corresponding [FeIV(O)(CH3CN)L]2+ ( 3 , L=Me,HPytacn; 4 , L=nP,HPytacn) species was studied in acetonitrile/acetone at low temperatures. The reactions occur in a single kinetic step with activation parameters independent of the nature of the anion and similar to those obtained for the substitution reaction with Cl− as entering ligand, which indicates that formation of [FeIV(O)(CH3CN)L]2+ is kinetically controlled by substitution in the starting complex to form [FeII(IO4)(CH3CN)L]+ intermediates that are converted rapidly to oxo complexes 3 and 4 . The kinetics of the reaction is strongly dependent on the spin state of the starting complex. A detailed analysis of the magnetic susceptibility and kinetic data for the triflate complexes reveals that the experimental values of the activation parameters for both complexes are the result of partial compensation of the contributions from the thermodynamic parameters for the spin-crossover equilibrium and the activation parameters for substitution. The observation of these opposite and compensating effects by modifying the steric hindrance at the ligand illustrates so far unconsidered factors governing the mechanism of oxygen atom transfer leading to high-valent iron oxo species. 相似文献
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5.
One of the main applications in plasma physics concerns the energy production through thermo-nuclear fusion. The controlled fusion is achieved by magnetic confinement i.e., the plasma is confined into a toroidal domain (tokamak) under the action of huge magnetic fields. Several models exist for describing the evolution of strongly magnetized plasmas, most of them by neglecting the collisions between particles. The subject matter of this paper is to investigate the effect of large magnetic fields with respect to a collision mechanism. We consider here linear collision Boltzmann operators and derive, by averaging with respect to the fast cyclotronic motion due to strong magnetic forces, their effective collision kernels. 相似文献
6.
We study the global existence and uniqueness of weak solutions to kinetic Kolmogorov–Vicsek models that can be considered as non-local, non-linear, Fokker–Planck type equations describing the dynamics of individuals with orientational interactions. This model is derived from the discrete Couzin–Vicsek algorithm as mean-field limit (Bolley et al., Appl Math Lett, 25:339–343, 2012; Degond et al., Math Models Methods Appl Sci 18:1193–1215, 2008), which governs the interactions of stochastic agents moving with a velocity of constant magnitude, that is, the corresponding velocity space for these types of Kolmogorov–Vicsek models is the unit sphere. Our analysis for Lp estimates and compactness properties take advantage of the orientational interaction property, meaning that the velocity space is a compact manifold. 相似文献
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9.
The blow-up in finite time for the solutions to the initial-boundary value problem associated to the multi-dimensional quantum
hydrodynamic model in a bounded domain is proved. The model consists on conservation of mass equation and a momentum balance
equation equivalent to a compressible Euler equations corrected by a dispersion term of the third order in the momentum balance.
The proof is based on a priori estimates for the energy functional for a new observable constructed with an auxiliary function,
and it is shown that, under suitable boundary conditions and assumptions on the initial data, the solution blows up after
a finite time.
I.M. Gamba is supported by NSF-DMS0507038. M.P. Gualdani acknowledges partial support from the Deutsche Forschungsgemeinschaft,
grants JU359/5 and was partially supported under the Feodor Lynen Research fellowship. P. Zhang is partially supported by
the NSF of China under Grant 10525101 and 10421101, and the innovation grant from the Chinese Academy of Sciences. Part of
the work was done when P. Zhang visited the Department of Mathematics of Texas University at Austin, the author would like
to thank the hospitality of the department. Support from the Institute for Computational Engineering and Sciences at the University
of Texas at Austin is also gratefully acknowledged. 相似文献
10.
Journal of Statistical Physics - We study high-energy asymptotics of the steady velocity distributions for model kinetic equations describing various regimes in dilute granular flows. The main... 相似文献