Vol. 43 No. 1 (218) (2009)

De- and re-hydroxylation of different silica gel samples’ surfaces were studied by IR-spectrometry method. Based on data of differential thermal heat of ethanol and water adsorption it was shown the energetic non-uniformity of samples’ surface regarding to polar molecules. It was proved that the surface of silica gel obtained from serpentinite is energetically more homogeneous.

The cited reaction has been studied at 298 K by gasometric method. At     0.5 ⋅10^-2$\leq$[DMSO]₀ $\leq$4 ⋅10^-2 M the reaction rate (R_O2) is being increased approximately by 16%. It is established by ESR method that TEMPO is not being expended and does not influence on the R_O2. In DMSO presence the reaction activation energy is less by 5.4 kJ/mol. It is assumed that H₂O₂ molecule interacts with the polar O$^{\delta −}\leftarrow$ S (CH₃)₂$^{\delta +}$  bond of DMSO molecule, which results in activation of H₂O₂ molecule. It reacts with enhanced rate HOO^– anion by nonradical mechanism. A mechanism is proposed and discussed.

Dielectric relaxation behavior of sodium dodecylsulfate in aqueous solutions of dimethylsulfoxide has been investigated by virtue of dielectric relaxation spectroscopy. It has been shown that in the ternary system SDS–water–DMSO stable micelles are formed at X_DMSO=0.2 and C_SDS=0.025 M.

The interaction of tungsten (VI) with tartaric acid is studied by methods of ion exchange and spectral photometry. It is established that at the indicated interaction the complexes with M ratio 1:1 ([WO₂(HC₄H₄O₆ )]⁺)  and 1:2 ([WO₂(HC₄H₄O₆)₂]⁰) appears. Stepwise and general stability constants for the complexes are defined.

Interaction of iodide anion complex of cadmium with basic dye crystal violet has been investigated. Formed ionic associate could be extracted by toluene–dichlorethan (2:1) binary mixture. Maximal light absorption is observed at  λ=575–590 nm wavelengths. The optimal acidity of aqueous phase is pH 1, optimal concentration of crystal violet is 6.3·10^–4–7.56·10^–4 M and KI – 3·10^–2–7·10^–2 M.  The range of determined concentration is 0.25–5.0 mcg/mL, ε₅₈₅ = 97000±600 (L·mol^–1·cm^–1). The method was used for determination of cadmium contents in tobacco, milk, sour cream and curd. The method is more sensitive and simple than those reported earlier.

The synthesis of new functionally substituted butanolids-4, barbituric and thiobarbituric acids on the base of 2-allyl-2-(2-morpholinoethyl)malonic acid diethyl ester has been realized.

The morphometric parameters of male gametophyte of some species and sorts of Rosaceae Juss. and Vitaceae Juss. families are investigated. The obtained results indicate that the registered variations are caused by specificity of a genotype. The taxons with the best parameters of pollen (peach, plum, vine sorts Meghrabuyr and Nerkarat) are of interest for bioindicational researches. Differences of pollen quality in control and experiment are not registered.

The mutagenic and clastogenic action of the waters of three bore holes and of the three artificial fish reservoirs in Armavir marz was investigated by Tradescantia (clone 02) somatic mutation hairs (Trad-SH) and micronucleus (TradMN) test-systems. It was revealed, that from 6 samples more genotoxic were the water samples taken from Aknashen bore-hole and Aknashen fish reservoir.

Asymmetry of brain evoked activity at immersing in virtual aggressive environment was researched at examinees with a various level of personal aggression. Authentic interhemispheric differences on ERP’s latent period in both groups of examinees were not shown. Interhemispheric differences on amplitude parameters were found. Primary domination of the brain right hemisphere at examinees with a high level of aggression before performance of the task is observed. The tendency to domination of the left hemisphere as a result of immersing in virtual aggressive environment was observed. Change of hemisphere’s domination with left on the right hemisphere at examinees with low level of aggression at the end of the experiment was shown.

The interaction of silver (I) with allyl- and phenylthioureas (ATU and PhTU) has been studied by means of potentiometric and amperometric titration methods. It has been established that the molar ratio of the reacting components [Ag⁺ ]:[ATU] ([PhTU])=1:1. The determination of silver may be carried in 0.1–1.0 M solutions of sulfuric acid and 0.1–4.0 М solutions of nitric acid. The combination of the two methods – potentiometric and amperometric titration permits to determine silver (I) in wide range 1.0·10^-4–1.6·10^-2 M (0.01–0.65 mg/mL) of concentrations. The amperometric titration method has been tested during the analysis of photofilm (determination error equals to 1.45% rel).

The interaction of the norsulfazole sodium salt with trimethylthionin (Azur II) basic dye has been studied. The optimal conditions for formation of ionic associate have been estimated. It has been revealed that the forming ionic associate may be isolated by means of onefold extraction during 0,.5 min by chloroform in the pH 8.5–9.5  range under equal volumes of organic and aqueous phases. The obeying to the photometry main law is observed within the 3.75–40.0 mcg/mL norsulfazole concentration range, the light adsorption molar coefficient average value at 640 nm wavelength ε=20000±300 (L·mol^–1·cm^–1). The norsulfazole sodium salt interacts with trimethylthionin in 1:1 molar ratio.