Preparation of highly loaded platinum nanoparticles on silica by intercalation of [Pt(NH<Subscript>3</Subscript>)<Subscript>4</Subscript>]<Superscript>2+</Superscript> ions into layered sodium silicate ilerite

Highly loaded Pt nanoparticles (20 wt%) on silica were prepared by intercalation of [Pt(NH₃)₄]²⁺ ions into layered sodium silicate ilerite at room temperature, followed by calcination of the intercalated ilerite ([Pt(NH₃)₄]²⁺ ilerite) in air at 380 °C for 5 h. Transmission electron microscopy revealed that the size of the Pt particles was in the range 2-5 nm.     

Determination of critical micelle concentration of bile acid salts by micro-calorimetric titration

Critical micelle concentrations (CMC) of sodium salts of cholic, deoxycholic and chenodeoxycholic acids in phosphate buffer (pH 7.92) have been determined from microcalorimetric titration curves. The obtained values of 18.4±0.6, 5.3±0.2 and 7.0±0.2 mM, respectively, for Na cholate, Na deoxycholate and Na chenodeoxycholate are close to literature values obtained by other methods. CMC values for secondary micelles were also obtained. This microcalorimetric titration method gives highly reproducible results and rapid determination of CMC values of bile acid salts.     

Density-functional and electron correlated study of five linear birefringences--Kerr, Cotton-Mouton, Buckingham, Jones, and magnetoelectric--in gaseous benzene

We present the results of an extended study of five birefringences--Kerr, Cotton-Mouton, Buckingham, Jones, and Magnetoelectric--on benzene in the gas phase. The relevant molecular quantities--first-order properties, linear, quadratic, and cubic response functions--are computed employing the density-functional theory (DFT) response theory, with a choice of functionals. In some cases, different functionals are employed for the wave-function computational step and for the subsequent analytical response calculation to determine the combination yielding at the same time the optimal energy and energy derivative results. Augmented correlation consistent basis sets of double and triple zeta quality are used. The DFT results are compared to those obtained at the Hartree-Fock level and in some cases within a coupled cluster singles and doubles electronic structure model. The study tries to assess the ability of the DFT response theory to describe a wide range of properties in a system of rather large size and high complexity. The relative strength of the five birefringences for plausible experimental conditions is determined and, when possible, comparison is made with the results of the measurements.     

Well–posedness for an Abstract Semilinear Integro–differential Fractional Problem

We consider an abstract second order semilinear integrodifferential equation involving fractional time derivatives of order between 1 and 2. Well–posedness is established under appropriate conditions on the initial data and the nonlinearity which is itself a fractional integral. These conditions will determine the exact underlying space where to look for solutions.     

Ab initio study of the two-photon circular dichroism in chiral natural amino acids

Two-photon circular dichroism spectra calculated within an origin-invariant density functional theory approximation in the absorption region where the lowest electronic excited states appear are presented for all 19 essential amino acids in the gas phase. A comparison of intensities and characteristic features is made with the corresponding two-photon absorption and one-photon circular dichroism spectra for each species. Also, the contributions of the electric dipole, magnetic dipole, and electric quadrupole transitions to the rotational strengths are analyzed in some detail. The remarkable fingerprinting capabilities of the two-photon circular dichroism spectroscopy are highlighted.     

Pharmacokinetic study of ofloxacin enantiomers in Pagrosomus major by chiral HPLC

(S)‐(?)‐Ofloxacin and (R)‐(+)‐ofloxacin concentrations in the plasma of Pagrosomus major after drug treatment were detected by chiral high‐performance liquid chromatography, and various pharmacokinetic parameters were calculated from these data. The elimination half‐life of (S)‐(?)‐ofloxacin was significantly shorter than that of the (R)‐(+) enantiomer. (S)‐(?)‐Ofloxacin also had a significantly lower maximum plasma concentration, area under the concentration–time curve from zero to infinity, and mean residence time than (R)‐(+)‐ofloxacin. However, the apparent volume of distribution and total body clearance of (S)‐(?)‐ofloxacin were greater than those of (R)‐(+)‐ofloxacin. The ratio of the (S)‐(?)‐ to (R)‐(+)‐ofloxacin plasma concentration was always <1.0. Together, these data suggest that (S)‐(?)‐ofloxacin was preferentially excreted and (R)‐(+)‐ofloxacin was preferentially absorbed. Although the difference in pharmacokinetic parameters was small, the metabolic behavior of the ofloxacin enantiomers in P. major was enantioselective. Copyright © 2015 John Wiley & Sons, Ltd.     

Weak ac field-induced patterns in vertical deposition of colloids at various evaporation rates

The European Physical Journal Special Topics - Pattern formation in colloids by weak ac fields in vertical deposition-like configuration at different temperatures has been studied experimentally....     

An Exact Class of Bulk Field Potentials onto the 5D-Warp of de Sitter Spacetime

In the five-dimensionally warped FRW Universe, we integrate the corresponding Einstein equations for a scalar source depending only on the extra-dimension. It yields a de Sitter brane and a specific warp factor for which we derive the effective bulk field potentials. These are generalizing some of the previously proposed forms in the literature.     

Variance-Optimal Martingale Measures for Diffusion Processes with Stochastic Coefficients

In this paper we present the solution of the optimal variance optimal martingale measure for stochastic volatility models, when the noises are correlated. It is proved that the value function of the dual problem is a classical solution of the corresponding Hamilton-Jacobi-Bellman equation. The method to develop our results is based on a Bernstein’s type of argument. The dual problem of the quadratic hedging problem is studied analyzing the expression obtained after a change of measure, which corresponds to some class of risk-sensitive control problems.