Synthesis of the azapodands with phosphoryl terminal groups

© 2016 Taylor & Francis Group, LLC.New lipophilic phosphorylated azapodands with different substituents at the nitrogen atom were synthesized via the Kabachnik–Fields reaction in the three-component system: di-p-tolylphosphinous acid– formaldehyde–1,8-diamino-3,6-dioxaoctane. The reaction was carried out in toluene or acetonitrile media, with p-toluenesulfonic acid acting as a catalyst

Synthesis, Transport, and Ionophoric Properties of α,ω-Diphosphorylated Azapodands: XI. Membrane Transport of Metals by Phosphorylated Diazapodands

© 2018, Pleiades Publishing, Ltd. The membrane transport of rare-earth metals and scandium by new diphosphorylated diazapodands was studied. It was found that the introduction of butyl groups and an additional phosphoryl group on the nitrogen atoms of the terminal aminomethylphosphinoyl groups of azapodands decreases the efficiency of transport of rare-earth metals and increases the selectivity to scandium ion

Synthesis, Transport, and Ionophoric Properties of α,ω-Biphosphorylated Azapodands: X. Membrane Transport of Organic Acids by Phosphorylated α,ω-Diazapodands

© 2018, Pleiades Publishing, Ltd. The membrane transport properties of novel phosphorylated azapodands with respect to mono- and polyfunctional carboxylic acids were studied. The structures of the transported Н-complexes are discussed, the complexing centers in the carriers are considered, and the correlations between the structure and transmembrane transport efficiency of the acid substrates are demonstrated

Membrane extraction of alkaline earth metal by phosphorylated azapodands

© 2016 Taylor & Francis Group, LLC.Membrane transport properties of the new lipophilic phosphorylated azapodands toward Сa(II), Ва (II), Mg(II), and Sr(II) were studied. The investigation of the processes of passive membrane ion transport showed the high values of the transfer flow of the alkaline earth metals’ ions with all carriers. It was found that N,N’-bis(di-p-tolylphosphorylmethyl)-1,8-diamino-3,6-dioxaoctane (I) is the most effective carrier among all compounds studied

Synthesis and membrane-transport properties of phosphorylated diamines, azapodands and their derivatives

© 2018, © 2018 Taylor & Francis Group, LLC. Membrane–transport properties of synthesized phosphorylated azapodands of a series of metals of I groups were studied. The investigation of the processes of passive membrane ion transport showed the phosphorylated azapodands 2 and 3 were the most selective with respect to the lithium ion. A monophosphorylated podand, which contain a heterocyclic nitrogen atom 8-(1-diamylphosphoryl-3,5-dioxapentane) quinoline 7 was synthesized. The molecular structure of the complex of a podande 7 with a copper ion was determined by the method of X-ray analysis

Synthesis and structure of novel phosphorylated azomethines

© 2016 Taylor & Francis Group, LLC.The condensation of do-, hexa-, octadecan-1-amines with bromo- and nitrobenzaldehydes yielded a series of Schiff bases in good yields. Subsequent reaction of these compounds with dioctylphosphine oxide yielded phosphorylated azomethines and some were characterized using X-ray crystallography. The structure of the isolated compounds was determined by IR and NMR spectroscopy, elemental analysis, and their thermal stability was studied by simultaneous thermogravimetry and differential scanning calorimetry. All of the synthesized compounds were tested for their antibacterial and anti-Candida activity. A number of the compounds exhibited antimicrobial activity comparable to that of the commercially available drugs, ciprofloxacin and clotrimazole

Epidemiological dynamics of nephropathia epidemica in the Republic of Tatarstan, Russia, during the period of 1997-2013

Copyright © Cambridge University Press 2015.This report summarizes epidemiological data on nephropathia epidemica (NE) in the Republic of Tatarstan, Russia. NE cases identified in the period 1997-2013 were investigated in parallel with the hantavirus antigen prevalence in small rodents in the study area. A total of 13 930 NE cases were documented in all but one district of Tatarstan, with most cases located in the central and southeastern districts. The NE annual incidence rate exhibited a cyclical pattern, with the highest numbers of cases being registered once in every 3-5 years. The numbers of NE cases rose gradually from July to November, with the highest morbidity in adult males. The highest annual disease incidence rate, 64·4 cases/100 000 population, was observed in 1997, with a total of 2431 NE cases registered. NE cases were mostly associated with visiting forests and agricultural activities. The analysis revealed that the bank vole Myodes glareolus not only comprises the majority of the small rodent communities in the region, but also consistently displays the highest hantavirus prevalence compared to other small rodent species

Abrasion processes of Kuibyshev Reservoir as a factor of destruction of archaeological site Ostolopovo (Tatarstan, Russia)

Estimation of abrasion on the archaeological sites situated at the Kuibyshev Reservoir, one of the largest in the Volga-Kama cascade is highly important. The bank erosion is a real danger for the cultural heritage, and collection of the data on trends in exogenous geological processes is necessary. Every year the changing water level in the Kuibyshev reservoir causes erosion of around 800 archaeological sites. Remote sensing data (aerial photography and space digital images) were used, as well as topographic maps 1:50000 for abrasion intensity monitoring at archaeological site Ostolopovo. It makes possible to estimate abrasion intensity during recent 40-50 years, and to create a prognostic model of sites destruction. © 2014 AENSI Publisher All rights reserved

Abrasion processes of Kuibyshev Reservoir as a factor of destruction of archaeological site Ostolopovo (Tatarstan, Russia)

Estimation of abrasion on the archaeological sites situated at the Kuibyshev Reservoir, one of the largest in the Volga-Kama cascade is highly important. The bank erosion is a real danger for the cultural heritage, and collection of the data on trends in exogenous geological processes is necessary. Every year the changing water level in the Kuibyshev reservoir causes erosion of around 800 archaeological sites. Remote sensing data (aerial photography and space digital images) were used, as well as topographic maps 1:50000 for abrasion intensity monitoring at archaeological site Ostolopovo. It makes possible to estimate abrasion intensity during recent 40-50 years, and to create a prognostic model of sites destruction. © 2014 AENSI Publisher All rights reserved

Estimation of potential capability of natural bitumens and high viscosity oils for refining according to fuel-bitumen scheme

According to different estimates, geological heavy oil and natural bitumens resources at the Tatarstan deposits make 1,5- 7 billion tons. On the territory of Tatarstan across all bituminous horizons about 450 deposits of natural bitumens have been found. One third of deposits of this raw materials existing in Russia fall on the share of Tatarstan. Natural bitumens are valuable material for production of fine chemicals that are used in different spheres of life activities. Natural bitumen is to a different extent oxidized high-viscosity oils of liquid, semi-liquid and hard texture with high content of sulfur, resins and asphaltenes. In contrast to oil, they are characterized by increased content of vanadium, nickel, molybdenum and significantly smaller content of gasoline and diesel fractions. Nevertheless, despite the works performed, no significant success has been achieved in production and processing of bitumens yet. This is mainly because of absence of the relevant equipment. It is necessary to accelerate development of bituminous deposits, creation of complexes with the use of high performance technologies and technical means for most complete extraction of this raw material from the earth and treatment thereof. Implementation thereof will create pre-requisites for commercial exploitation of natural bitumens deposits not only in Tatarstan but in other regions of the Russian Federation as well. To estimate the potential capability of natural bitumens and high viscosity oils it is necessary to perform detailed analysis aimed at determining the graphical charts of the true temperature curve, density, low-temperature, viscosity properties, fraction and hydrocarbon composition