Number 1. (in 1 part) December 16, 2014
1. Ekaterina A. Fedorova, Larisa N. Maskaeva, Vyacheslav F. Markov
The Thermodynamic Estimation of Forming Possibility of Cu2–xSe thin Films and Investigation of the Composition and Morphology
European Reviews of Chemical Research, 2014, Vol.(2), № 2, pp. 76-85.
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2. Aleksey Y. Kirsanov, Vyacheslav F. Markov, Larisa N. MaskaevaEuropean Reviews of Chemical Research, 2014, Vol.(2), № 2, pp. 76-85.
Abstract:
The boundary formation conditions of solid phase of copper(I) selenide and copper(I) hydroxide determined by means of the thermodynamic analysis for systems “copper(II) chloride − hydroxylamine hydrochloride – sodium selenosulphate” considering the formation of crystal nucleus with critical radii. It is shown that obtaining nanocrystalline films of copper(I) selenide nonstoichiometric composition Cu2–xSe is possible by chemical deposition. The thickness of the thin film layers determined by the method interferometry, amounted to 100–400 nm. The composition and morphology of the deposited semiconductor material investigated by energy-dispersive spectroscopy and scanning electron microscopy. Revealed that freshly layers consist of polyhedral shape crystallites, and composition corresponds to the formula Cu1,5Se.
The boundary formation conditions of solid phase of copper(I) selenide and copper(I) hydroxide determined by means of the thermodynamic analysis for systems “copper(II) chloride − hydroxylamine hydrochloride – sodium selenosulphate” considering the formation of crystal nucleus with critical radii. It is shown that obtaining nanocrystalline films of copper(I) selenide nonstoichiometric composition Cu2–xSe is possible by chemical deposition. The thickness of the thin film layers determined by the method interferometry, amounted to 100–400 nm. The composition and morphology of the deposited semiconductor material investigated by energy-dispersive spectroscopy and scanning electron microscopy. Revealed that freshly layers consist of polyhedral shape crystallites, and composition corresponds to the formula Cu1,5Se.
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Computer Simulation as a way to Determine the Conditions of Purposeful Synthesis of AgxPb1¬xS Solid Solutions by Hydrochemical Deposition
European Reviews of Chemical Research, 2014, Vol.(2), № 2, pp. 86-91.
Number of views: 2346 Download in PDF
3. Oleg Mosin, Ignat Ignatov, Dmitry Skladnev, Vitaly ShvetsEuropean Reviews of Chemical Research, 2014, Vol.(2), № 2, pp. 86-91.
Abstract:
In this paper authors have demonstrated the possibility of using aggregative growth model to search conditions of synthesis required composition AgxPb1−xS1−δ thin films. According to simulation results concentration areas of forming supersaturated solid solution components with a maximum of Ag2S up to 12,8 mol.% have established. The experiment confirmed the adequacy of the model for the PbS–Ag2S system.
In this paper authors have demonstrated the possibility of using aggregative growth model to search conditions of synthesis required composition AgxPb1−xS1−δ thin films. According to simulation results concentration areas of forming supersaturated solid solution components with a maximum of Ag2S up to 12,8 mol.% have established. The experiment confirmed the adequacy of the model for the PbS–Ag2S system.
Number of views: 2346 Download in PDF
Biosynthetic incorporation of deuterium-labeled aromatic amino acids - [2,3,4,5,6-2H5]phenylalanine, [3,5-2H2]tyrosine and [2,4,5,6,7-2H5]tryptophan into the molecule of transmembrane protein bacteriorhodopsin from halobacterium Halobacterium halobium E
European Reviews of Chemical Research, 2014, Vol.(2), № 2, pp. 92-108.
Number of views: 2679 Download in PDF
4. Oleg Mosin, Ignat Ignatov, Dmitry Skladnev, Vitaly ShvetsEuropean Reviews of Chemical Research, 2014, Vol.(2), № 2, pp. 92-108.
Abstract:
It was carried out the method for microbiological preparation and isolation of trans membrane photo-transforming protein bacteriorhodopsin (output 810 mg), labeled with deuterium on residues of [2,3,4,5,6-2H5]phenylalanine, [3,5-2H2]tyrosine, and [2,4,5,6,7-2H5]tryptophan. The protein was allocated from membranes of photoorganotrophic halobacterium Halobacterium halobium ET 1001 by cellular lysis by distilled water, processing of bacterial biomass by ultrasound, alcohol extraction of low and high-weight molecular impurities, cellular RNA, carotenoids and lipids, with the subsequent solubilization of final product with 0,5% SDS-Na and fractionation by methanol. The homogenity of the synthesized product, and the selectivity of deuterium encorporation into the molecule was proved by combination of preparative and analytical protein methods including elecrtophoresis in 12,5% PAAG with 0,1% SDS-Na, gel filtration chromatography on Sephadex G-200, reverse-phase HCLP, electron impact mass-spectrometry of methyl esters of N-5-(dimethylamino)naphthalene-1-sulfonyl chloride (dansyl) derivatives of amino acids.
It was carried out the method for microbiological preparation and isolation of trans membrane photo-transforming protein bacteriorhodopsin (output 810 mg), labeled with deuterium on residues of [2,3,4,5,6-2H5]phenylalanine, [3,5-2H2]tyrosine, and [2,4,5,6,7-2H5]tryptophan. The protein was allocated from membranes of photoorganotrophic halobacterium Halobacterium halobium ET 1001 by cellular lysis by distilled water, processing of bacterial biomass by ultrasound, alcohol extraction of low and high-weight molecular impurities, cellular RNA, carotenoids and lipids, with the subsequent solubilization of final product with 0,5% SDS-Na and fractionation by methanol. The homogenity of the synthesized product, and the selectivity of deuterium encorporation into the molecule was proved by combination of preparative and analytical protein methods including elecrtophoresis in 12,5% PAAG with 0,1% SDS-Na, gel filtration chromatography on Sephadex G-200, reverse-phase HCLP, electron impact mass-spectrometry of methyl esters of N-5-(dimethylamino)naphthalene-1-sulfonyl chloride (dansyl) derivatives of amino acids.
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Microbiological Synthesis of 2Н- and 13С-Labeled Amino Acids and Proteins With Various Levels of Isotopic Enrichment
European Reviews of Chemical Research, 2014, Vol.(2), № 2, pp. 109-132.
Number of views: 2371 Download in PDF
5. European Reviews of Chemical Research, 2014, Vol.(2), № 2, pp. 109-132.
Abstract:
By the method of microbiological synthesis were obtained and analyzed by electron impact mass-spectrometry the evaluation of 2H and 13C enrichment levels of secreted amino acids of methylotrophic bacteria Brevibacterium methylicum and Methylobacillus flagellatum, and amino acid resigues of total protein obtained from media contaning as a sourse of stable isotopes [2H]methanol, [13C]methanol and 2H2O. It was also performed the incorporation of L-[2,3,4,5,6-2Н]phenylalanine, L-[3,5-2Н]tyrosine and L-[2,4,5,6,7-2Н]tryptopan in bacteriorhodopsin synthesised in purple membranes of photo-organotrophic halobacterium Halobacterium halobium ET 1001. For mass-spectrometric analysis the multicomponential mixures of 2H- and 13C-labeled amino acids, derived from cultural media and protein hydrolysates after hydrolysis in 6 M 2HСl (3 % phenol) and 2 M Ва(OH)2 were modified into N-benzyloxycarbonyl-derivatives of amino acids as well in methyl esters of N-dansyl-derivatives of amino acids, which were preparative separated using a method of reverse-phase HCLP. 2H- and 13C-labeled amino acids represented the mixures differing in quantities of isotopes incorporated into molecule. The levels of 2H and 13С enrichment of secreted amino acids and amino acid resigues of protein were found to vary from 20,0 atom % to L-leucine/isoleucine up to 97,5 atom% for L-alanine depending on concentration of 2H- and 13C-labelled substrates.
By the method of microbiological synthesis were obtained and analyzed by electron impact mass-spectrometry the evaluation of 2H and 13C enrichment levels of secreted amino acids of methylotrophic bacteria Brevibacterium methylicum and Methylobacillus flagellatum, and amino acid resigues of total protein obtained from media contaning as a sourse of stable isotopes [2H]methanol, [13C]methanol and 2H2O. It was also performed the incorporation of L-[2,3,4,5,6-2Н]phenylalanine, L-[3,5-2Н]tyrosine and L-[2,4,5,6,7-2Н]tryptopan in bacteriorhodopsin synthesised in purple membranes of photo-organotrophic halobacterium Halobacterium halobium ET 1001. For mass-spectrometric analysis the multicomponential mixures of 2H- and 13C-labeled amino acids, derived from cultural media and protein hydrolysates after hydrolysis in 6 M 2HСl (3 % phenol) and 2 M Ва(OH)2 were modified into N-benzyloxycarbonyl-derivatives of amino acids as well in methyl esters of N-dansyl-derivatives of amino acids, which were preparative separated using a method of reverse-phase HCLP. 2H- and 13C-labeled amino acids represented the mixures differing in quantities of isotopes incorporated into molecule. The levels of 2H and 13С enrichment of secreted amino acids and amino acid resigues of protein were found to vary from 20,0 atom % to L-leucine/isoleucine up to 97,5 atom% for L-alanine depending on concentration of 2H- and 13C-labelled substrates.
Number of views: 2371 Download in PDF