Example of Disulfide Conformational Change in the Solid State: Preparation, Optical Properties, and X-ray Studies of a Cystamine-Based Iodoplombate Hybrid

A novel cystamine-based hybrid, namely, α-[NH3(CH2)2SS(CH2)2NH3PbI6]·2H3O (1a), was prepared under solvothermal conditions. Interestingly, 1a, which is built up from isolated PbI6 octahedra, can be easily changed into its polymorph, namely, β-[NH3(CH2)2S–S(CH2)2NH3PbI6]·2H3O (1b) only by heating it up to 45 °C. According to the results of X-ray diffraction analyses, the polymorphic phenomenon of 1a and 1b results from a conformational change in the helical diprotonated cystamine cation in the solid state. Both 1a and 1b crystallized in the orthorhombic Pna21 space group. The reversibility of this transformation is proved by single-crystal X-ray diffraction and second harmonic generation measurements

IMPACT OF THE USE OF A PROBIOTIC (Enterococcus faecium) ON ZOOTECHNIC PERFORMANCE AND LIPIDID PROFILE IN BROILER CHICKEN

This study was conducted to determine the effect of probiotic Enterococcus faecium DSM 7134 feed supplementation on animal performance of broilers poultry when compared to control animals. The determination of lipid status parameters on day 51 was performed on 5 chicks randomly selected in each group.. Biochemical analyzes included total cholesterol, triglycerides, high density lipoproteins (HDL) and low density lipoproteins (LDL). Individual live weight, consumption index and mortality rate were measured at the end of the rearing phases. The results obtained showed that the addition of Enterococcus faecium significantly improved live weight throughout the rearing period without significant charge on FCR and mortality rate. The experimental group had significantly higher cholesterol, triglyceride and HDL levels.

Scaling of the electron dissipation range of solar wind turbulence

Electron scale solar wind turbulence has attracted great interest in recent years. Clear evidences have been given from the Cluster data that turbulence is not fully dissipated near the proton scale but continues cascading down to the electron scales. However, the scaling of the energy spectra as well as the nature of the plasma modes involved at those small scales are still not fully determined. Here we survey 10 years of the Cluster search-coil magnetometer (SCM) waveforms measured in the solar wind and perform a statistical study of the magnetic energy spectra in the frequency range [$1, 180$]Hz. We show that a large fraction of the spectra exhibit clear breakpoints near the electon gyroscale $\rho_e$, followed by steeper power-law like spectra. We show that the scaling below the electron breakpoint cannot be determined unambiguously due to instrumental limitations that will be discussed in detail. We compare our results to recent ones reported in other studies and discuss their implication on the physical mechanisms and the theoretical modeling of energy dissipation in the SW.Comment: 10 pages, submitte

Variational principle for frozen-in vortex structures interacting with sound waves

General properties of conservative hydrodynamic-type models are treated from positions of the canonical formalism adopted for liquid continuous media, with applications to the compressible Eulerian hydrodynamics, special- and general-relativistic fluid dynamics, and two-fluid plasma model including the Hall-magnetohydrodynamics. A variational formulation is found for motion and interaction of frozen-in localized vortex structures and acoustic waves in a special description where dynamical variables are, besides the Eulerian fields of the fluid density and the potential component of the canonical momentum, also the shapes of frozen-in lines of the generalized vorticity. This variational principle can serve as a basis for approximate dynamical models with reduced number of degrees of freedom.Comment: 7 pages, revtex4, no figure

Polymorphism of lead(ii) benzenethiolate: a noncentrosymmetric new allotropic form of Pb(SPh)2

Depending upon its conditions of crystallization, lead(II) benzenethiolate can exist in two forms: a low-temperature centrosymmetric phase α-Pb(SPh)2 which can be converted by heating into the noncentrosymmetric, 2nd order NLO strongly active and room temperature metastable β-Pb(SPh)2 phase, thus affording an example of transition towards noncentrosymmetry induced by a rise of temperature

Nonlinear photonics properties of porphyrins nanocomposites and self-assembled porphyrins

Two major reasons limit porphyrins photonic applications: (i) the difficulty of handling them in liquid solutions and (ii) their degradation with long exposure to light. This necessitates the use of appropriate solid matrices to host the porphyrin compounds such as Nafion (117), a stable and inert ion exchange polymer. The first part of this publication confirms such a possibility. In addition to their effective NLO properties, an enhancement of the Soret and Q-bands absorbance width have been observed by blending three different porphyrin molecules in the Nafion column matrix membrane. This is an important development towards achieving efficient photon-harvesting medium for possible application in photonic devices. The second part of this contribution reports on the self-assembly/molecular recognition of a specific class of porphyrins giving rise to tubular nano-systems with potential THG nonlinear properties

Main mineral contents in camel meat in Algeria

The objective of the study was to determine the concentrations of minerals and trace elements in camel meat in Algeria. Meat samples from 32 camels were collected. The assays were performed by atomic emission spectroscopy. The mean concentrations (± standard error) of calcium and phosphorus were 33.1 ± 6.1 and 655 ± 21.3 mg / 100 g, respectively. Trace element contents were 14,056 ± 831 µg / 100 g for zinc, 6100 ± 447 µg / 100 g for iron, and 1322 ± 43 µg / 100 g for copper. The breed factor had a highly significant effect (p < 0.001) on calcium and sodium levels. No significant effects (p < 0.05) of age were observed on the various minerals studied. The meat of the dromedary has mineral contents similar to those of other farm animals

The Investigation of third-order hyperpolarizabilities and susceptibilities of push-pull azobenzene polymers

International audienc

Nonlinear optical properties of selected natural pigments extracted from spinach: Carotenoids

They are report here, for the first time in authors knowledge, results on third order nonlinear optical susceptibilities from a series of natural pigments extracted from spinach. The measurements were performed in-situ at 532 nm wavelength using degenerate four wave mixing technique (DFWM). For comparison third order nonlinear optical susceptibilities of the same pigments were also evaluated using third harmonic generation (THG) set up at 1064 nm. The electronic contribution to the observed properties was also deduced. The measurements were performed on thin films deposited on a thick glass substrate. These pigments were also identified by UV–VIS spectral analysis. All these results were in good agreement with the literature data