Features of the stokes vector of polarized radiation when passing through a magneto-optical crystal under conditions of magnetomechanical resonance

Components of the Stokes vector are shown to undergo amplitude- and phase-frequency variations for a magneto-optical thin rod-shaped crystal located under conditions of magnetomechanical resonance when the variable magnetic field is directed at an acute angle to the light propagation axis coinciding with the crystal oscillation axis. It is noted that the phase relations for these components must be taken into account for polarized light when finding the connection between the variable and constant components of the Stokes vector.     

Synthesis and properties of ω-(hydroxyaryl)alkylsulfides based on 2-isobornyl-6-methyl-4-propylphenol

Proceeding from 2-isobornyl-6-methyl-4-propylphenol new derivatives have been synthesized having sulfur atoms included in different functional groups. Antiradical and antioxidant activity, as well as membrane-protecting properties of the derivatives of 2-isobornyl-6-methyl-4-propylphenol in chemical and biological model systems have been investigated.     

Tritium-labeled 5-oxo-Pro-Arg-Pro

Conditions of tritium introduction into 5-oxo-Pro-Arg-Pro have been developed. Labelled 5-oxo-Pro-Arg-Pro has been obtained in 75% yield and molar radioactivity of 60 Ci/mmol. Tritium distribution over amino acid residues in the peptide has been determined. 5-Oxo-Pro : Arg : Pro ratio in the labelled peptide has been found to be 1 : 5.2 : 2.8. Nonterminal amino acid has been found to contain the major portion of tritium, about 35 Ci/mmol; i.e., arginine includes more than half of the label. Such a feature can be explained by the effect of readily protonated guanidine group of arginine. The influence of charged guanidine group of arginine seems to increase the shift of electron density in the neighboring C–H bonds of arginine and proton mobility, thus increasing protium–tritium exchange at these carbon atoms.     

Voltammetric Determination of Allura Red AC onto Carbone-paste Electrode Modified by Silica with Embedded Cetylpyridinium Chloride

In current study the carbon-paste electrode modified by silica with embedded cetylpyridinium chloride for determination of Allura Red AC have been developed. The optimal conditions were determined to be for the square-wave voltammetric quantification: pH=2, E_ads=300 mV, t_ads=300 s, amplitude – 40 mV, frequency – 25 Hz and potential scan rate is 250 mV sec⁻¹. The calibration plot has linearity in the concentration ranges 0.04–0.2 μM and 0.2–1.00 μM. The LOD and LOQ are equal to 0.005 μM and 0.015 μM respectively. The crafted sensor has been applied successfully to model solutions and in jelly candies analysis with RSD no more than 10 %.     

Influence of the fractality of opal matrices on melting and crystallization of decane in pores

In this paper we present the results of studies on melting and crystallization of decane embedded in the pores of opal matrices filled with chemically pure hexadecane. In this studies measured the ultrasonic velocity by the pulse-interference method at frequencies of about 7 MHz in the temperature range 170–290 K.     

Polysilsesquioxanes Containing Superparamagnetic Nanoclusters of Cobalt or Nickel

Theoretical and Experimental Chemistry - A method was developed for the synthesis of ion-coordinated polysilsesquioxanes (OSS-M) by reaction of amphiphilic carboxyl-containing oligosilsesquioxanes...     

Low-Temperature Heat Capacity and Phonon Kinetics in Some Rare-Earth Pentaphosphate Single Crystals and Glasses

Journal of Experimental and Theoretical Physics - The influence of the Schottky low-energy excitations related to the presence of rare-earth metals on the thermodynamic and kinetic characteristics...