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11.
Dmitry V. Orekhov Oleg A. Kazantsev Sergey V. Orekhov Alexey P. Sivokhin Denis M. Kamorin Alexander S. Simagin Maria V. Savinova Evgeniya A. Bolshakova Michail S. Korotaev 《应用聚合物科学杂志》2021,138(38):50982
Thermoresponsive PEG-based (PEG stands polyethylene glycol) polymers are unique for use in medicine because of their low toxicity, good biocompatibility and biodegradability, but usually more hydrophobic and more toxic comonomers are used to adjust lower critical solution temperature (LCST). A convenient way to overcome this problem and to finely tune LCST is to use alkoxy oligo(ethylene glycol)- or alkoxy oligo(propylene glycol) (meth)acrylates as starting comonomers. Here we report on the conditions for the simple and affordable synthesis of methoxy oligo(propylene glycol) (meth)acrylate- and methoxy oligo(propylene glycol)-block-oligo(ethylene glycol) (meth)acrylate-based macromonomers with high yields (80%–98.7%) by the acid-catalyzed esterification of (meth)acrylic acid with alkoxy oligo(alkylene glycols) containing oligo(ethylene glycol) (OEG) and/or oligo(propylene glycol) (OPG) blocks. p-Toluene sulphonic acid (pTSA), alkyl(C12–C14)benzene sulfonic acid (ABSA) and H2SO4 were used as catalysts. It has been shown that pTSA and ABSA are practically the same in catalytic activity and are superior to sulfuric acid. The reaction orders with respect to catalyst was found to be close to 1 in all cases. It has been shown that the reaction is actually insensitive to the lengths of OEG and OPG blocks, as well as to the structure of the terminal alkyl group, while the esterification of acrylic acid (AA) proceeds much faster compared to methacrylic acid (MAA) one under the same conditions. The influence of temperature on the equilibrium conversions of alcohols was determined, which were found to be 89%–93% for the esterification of AA and 61%–86% for MAA in the temperature range of 60–120°C. A further increase in conversion was achieved by introducing an azeotropic agent (toluene), its optimal concentration was found to be 10%–15%. 相似文献
12.
A. Yu. Vdovichenko L. N. Oveshnikov A. S. Orekhov S. A. Zav’yalov B. A. Aronzon S. N. Chvalun 《Technical Physics Letters》2018,44(10):890-893
The structure and conductivity of hybrid nanocomposite poly(p-xylylene) films containing iron nanoparticles are studied. The films are obtained by the method of polymerization on a surface from the gas phase, and the concentration of the filler is 4 and 11 vol %. According to the analysis of microphotographs of nanostructures obtained by transmission electron microscopy, the particles are distributed evenly (with a size in the nanometer range and a rather narrow distribution). Studies of the frequency dependence of conductivity show that the transport of the charge carriers is realized by the hopping mechanism with a jump length of ~3.5 nm. 相似文献
13.
BV Worgul Y Kundiev I Likhtarev N Sergienko A Wegener CP Medvedovsky 《Canadian Metallurgical Quarterly》1996,35(3):137-144
The general epidemiological acceptability of prevalence, or incidence, for assessing risk of radiation cataract development has dictated an almost exclusive dependence on cataract onset as a measure of cataractogenicity for given doses of radiation. The advent of instrumentation capable of acquiring images amenable to quantitative analyses offers the possibility of exploiting "relative opacification" as an added, if not exclusive, parameter. This development is particularly important in efforts to assess populations such as that in the Altai, which are temporally far removed from their exposure and among whom there exists a large subset with extant cataracts. The new technologies, Scheimpflug and retroillumination imaging, combined with the application of the appropriate analytical algorithms can not only provide quantitative and nonsubjective assessment of lens transparency, but also serve as a means to immortalize the state of the pathology at the time of acquisition. Highly relevant to the assessment of an aging exposed population is the use of lens epithelial fragments as potential dosimeters. The material is routinely available as a result of cataract extraction procedures and is amenable to the application of a modified micronucleus (MN) assay. The MN assay in the lens has tremendous advantages over its use in other tissues for a number of reasons, not least of which is that lens MNs are extremely long-lived. Given the relative ease of application and its potential as a radiation bioindicator, the lens MN assay should be considered in any follow-up of populations exposed to ionizing radiation. 相似文献
14.
O. V. Degtyarev V. N. Minaenko M. O. Orekhov 《Journal of Computer and Systems Sciences International》2010,49(4):624-642
This is the continuation of the paper devoted to the study of airspace sectorization problems for air traffic areas as one
of airspace design problems [1]. Algorithmic and technical aspects of solution of the problem of the first stage of airspace
sectorization of a district center of air traffic management based on genetic optimization procedures are considered. Results
of simulation of operation of optimization procedures are analyzed. 相似文献
15.
BM Mytskan BV Shchutka VA Shakhlamov MA Mytskan 《Canadian Metallurgical Quarterly》1993,116(8):208-210
Under increased muscular activity in some muscular fibers disintegration areas of myofibrillar apparatus has been revealed. Migration of myonuclei into these microregions starts the mechanism of their segregation due to plasmolemma produced from the reticulum sarcoplasmaticum and triad systems surface. After plasmolemma production in "sarcocytes" intensive development and differentiation of organellae occur. As a result of differentiation "sarcocytes" transform in to myosatellitocytes of type-2 and migrate under lamina externa muscular fibers. So, a hypothesis about formation of myogenic tissue's cellular phase from the myosymplastic one has been confirmed. 相似文献
16.
V. T. Gotovchikov V. I. Makarov V. T. Orekhov A. G. Rybakov V. A. Seredenko 《Atomic Energy》2005,99(4):712-715
The results of investigations of the leading operation of a nonaqueous technology for reprocessing fuel elements from nuclear
reactors — dissolution of fuel claddings in a zinc-based melt — are presented. Data obtained in experiments on simulators
and samples of irradiated fuel elements in standard BOR-60 and SM-2 packages with different burnup and holding time are presented.
In the experiments, the metallic melt was separated from the fuel by filtering through a mesh and regenerated by vacuum distillation
for reuse. The uranium and plutonium extraction was 99.99%. The behavior of individual radionuclides is described.
__________
Translated from Atomnaya Energiya, Vol. 99, No. 4, pp. 273–276, October, 2005. 相似文献
17.
Anastasia V. Poznyak Nikolay K. Sadykhov Andrey G. Kartuesov Evgeny E. Borisov Vasily N. Sukhorukov Alexander N. Orekhov 《International journal of molecular sciences》2022,23(13)
Aging is one of the most intriguing processes of human ontogenesis. It is associated with the development of a wide variety of diseases affecting all organs and their systems. The victory over aging is the most desired goal of scientists; however, it is hardly achievable in the foreseeable future due to the complexity and ambiguity of the process itself. All body systems age, lose their performance, and structural disorders accumulate. The cardiovascular system is no exception. And it is cardiovascular diseases that occupy a leading position as a cause of death, especially among the elderly. The aging of the cardiovascular system is well described from a mechanical point of view. Moreover, it is known that at the cellular level, a huge number of mechanisms are involved in this process, from mitochondrial dysfunction to inflammation. It is on these mechanisms, as well as the potential for taking control of the aging of the cardiovascular system, that we focused on in this review. 相似文献
18.
A. V. Kopylov I. V. Orekhov V. V. Petukhov A. E. Solomatin 《Technical Physics Letters》2014,40(3):185-187
A method for registration of the coherent scattering reactor antineutrino on nuclei using a three-section low-background proportional counter was proposed. It is planned to use argon and xenon as the working substance. As has been shown on a test bench, pulse shape discrimination can effectively suppress the background from electromagnetic interference and microphonic effects in the energy range from 20 to 100 eV where the effect of coherent scattering of neutrinos on nuclei is expected with a factor of about 103. Problems of the neutron background generated by cosmic-ray muons are analyzed. The scheme of the experimental setup is presented. 相似文献
19.
S. M. Danov S. V. Orekhov A. E. Fedosov M. E. Fedosova A. I. Shishkin 《Theoretical Foundations of Chemical Engineering》2016,50(4):525-529
This paper presents experimental data on the study of catalytic systems based on titanium silicalite (TS-1) for liquid-phase oxidation of phenol. The influence of the main parameters of the process of liquid phase oxidation of phenol with aqueous solution of hydrogen peroxide on the catalyst; the formed titanium silicalite (initial molar ratio of phenol/hydrogen peroxide, temperature) has been studied based on the basic parameters of the process, including the degree of conversion of hydrogen peroxide, the degree of conversion of phenol, the selectivity of the formation of catechol, hydroquinone and 1,4-benzoquinone, and the ratio of products in the reaction mass. 相似文献
20.
Siarhei A. Dabravolski Nikita G. Nikiforov Alexander D. Zhuravlev Nikolay A. Orekhov Liudmila M. Mikhaleva Alexander N. Orekhov 《International journal of molecular sciences》2022,23(1)
Thyroid cancer (TC) is the most common type of endocrine malignancy. Tumour formation, progression, and metastasis greatly depend on the efficacy of mitochondria—primarily, the regulation of mitochondria-mediated apoptosis, Ca2+ homeostasis, dynamics, energy production, and associated reactive oxygen species generation. Recent studies have successfully confirmed the mitochondrial aetiology of thyroid carcinogenesis. In this review, we focus on the recent progress in understanding the molecular mechanisms of thyroid cancer relating to altered mitochondrial metabolism. We also discuss the repurposing of known drugs and the induction of mitochondria-mediated apoptosis as a new trend in the development of anti-TC therapy. 相似文献