European Reviews of Chemical Research

86-91

Authors: Aleksey Y. Kirsanov, Vyacheslav F. Markov, Larisa N. Maskaeva

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.

109-132

Authors: Oleg Mosin, Ignat Ignatov, Dmitry Skladnev, Vitaly Shvets

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.

10-21

Authors: Mohammad Asif

Many human illnesses are caused by infections with microbes like viruses or bacteria or fungi. Amongst those various illnesses, certain tubercular, bacterial, viral and fungal infections are more common because of their tendency to develop new strains under any circumstances and developing resistance against the available drugs. This stimulated the scientists for development of novel molecules to combat these illnesses. Several nicotinic derivatives were evaluated for their antibacterial activity against tuberculosis. This review summarized the facts concerning nicotinic acid analogues. The nicotinic acid moiety of nicotinic acid has been introduced in a number of compounds with antimicrobial activity against various pathogens as well as resistant strains. Several nicotinic acid analogues have shown good antimicrobial activity. Therefore this class of compounds could be a good starting point to develop new lead compounds in the treatment of multi-drug resistant bacteria.

27-35

Authors: Mehmood A. Kalwar, Hakim A. Sahito, Barkat A. Kalwar, Madan Lal, Shahnawaz Fazlani

The study was performed to determine the performance of ginger, garlic, neem and ivermectin on the ticks. For that purpose, 12 male buffalo calves were selected, which were divided in four groups in A, B, C and D, each group contained 3 animals. The data was collected on 3rd, 8th, 15th and 21st day, respectively. The effectiveness of ivermectin on 3rd day found (25.92%), 8th (37.03%), 15th (92.6%) and 21st day found (100%) whereas, neem seed extract was observed on 3rd day found (55.81%), 8th (48.83%), 15th (41.86%) and on 21st day (46.51%) thus, ginger extract 3rd day found (63.46%), 8th (51.92%), 15th (51.92) and 21st day (61.54%), and garlic extract on 3rd day found (32.61%), 8th (39.13%), 15th (36.96%) and 21st day (30.43%), respectively. It was concluded from the comparative effect of the ethno plant extracts and ivermectin on ticks’ interaction that in total extract the ginger found more potent followed by neemseed extract and garlic but their effect was prolonged effect and 100% result was achieved through the ivermectin hence, it is recommended for the tick infestation and treatment.

60-72

Authors: Oleg Mosin, Ignat Ignatov

The semi-preparative biosynthesis of photochrome trans-membrane protein bacteriorhodopsin (output 810 mg), labeled with deuterium on functionally important amino acid residues  [2,3,4,5,6-2H5]phenylalanine, [3,5-2H2]tyrosine, and [2,4,5,6,7-2H5]tryptophan was carried out with using a photo-organotrophic halobacterium Halobacterium halobium. The protein was isolated from purple membranes by cellular autolysis by distilled water, processing of bacterial biomass by ultrasound at 22 KHz, alcohol extraction of low and high-weight molecular impurities, cellular RNA, carotenoids and lipids, with the subsequent solubilization of final product with 0,5 % (w/v) SDS-Na and fractionation by methanol. The homogenity of the synthesized bacteriorhodopsin and the selectivity of deuterium incorporation into the molecule was proved by combination of preparative and analytical protein methods including elecrtophoresis in 12,5 % (w/v) PAAG with 0,1 % (w/v) SDS-Na, gel filtration chromatography on Sephadex G-200, reverse-phase HPLC and electron impact mass-spectrometry of methyl esters of N-Dns-[2H]derivatives of amino acids.