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1.
S. V. Valueva L. N. Borovikova V. V. Koreneva Ya. I. Nazarkina A. I. Kipper V. V. Kopeikin 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2007,81(7):1170-1173
Nanostructures formed during the reduction of ionic selenium in the selenite-ascorbate redox system in an aqueous solution of bovine serum albumin (BSA) were studied using static and dynamic light scattering and flow birefringence. It was established that this process results in the formation of stable aggregates of selenium nanoparticles that adsorb BSA molecules. It was found that highly-ordered superhigh-molecular-weight spherical nanostructures with high density and unique morphology are formed. Experiments with a cell culture of promyelocytic leukemia HL-60 showed that BSA adsorbed on selenium nanoparticles can inhibit the growth of tumor cells and deactivate free radicals with an efficiency comparable with that of sodium selenite. 相似文献
2.
Kopeikin V. V. Valueva S. V. Kipper A. I. Filippov A. P. Khlebosolova E. N. Borovikova L. N. Lavrent'ev V. K. 《Russian Journal of Applied Chemistry》2003,76(5):818-821
The nanostructures formed by reduction of Se(IV) in the selenite-ascorbate redox system in an aqueous solution of supermacromolecular polycation, poly[trimethyl(methacryloyloxyethyl)ammonium] methyl sulfate, were studied by static and dynamic optical scattering and flow birefringence. 相似文献
3.
Kopeikin V. V. Valueva S. V. Kipper A. I. Filippov A. P. Shishkina G. V. Borovikova L. N. Rumyantseva N. V. Nazarkina Ya. I. Lavrent'ev V. K. 《Russian Journal of Applied Chemistry》2004,77(5):809-812
A study was made of formation of selenium nanoparticles in water from reduction of sodium selenite with ascorbic acid in the presence of polyacrylic and polymethacrylic acids. 相似文献
4.
V. P. Borovikova N. N. Tarasova G. N. Lavrenova V. M. Stepanov 《Chemistry of Natural Compounds》1979,15(2):161-168
Summary 1. The chromatography of the carboxylic proteinases porcine pepsin, aspergillopepsin A, and chymosin on the hydrophobic sorbent Sepharose 4B-DNP-hexamethylenediamine has been studied. It has been shown that the nature of the binding of the proteinases with the sorbent depends on the pH.2. A shortening of the length of the carbohydrate chain of the ligand by four methylene units substantially weakens the interaction of pepsin with the sorbent.3. With chymotrypsin and pepsin as examples, the possibility has been shown of using ionic effects for separating these enzymes.M. V. Lomonosov Moscow State University. Translated from Khimiya Prirodnykh Soedinenii, No. 2, pp. 191–199, March–April, 1979. 相似文献
5.
E. Yu. Borovikova D. A. Ksenofontov Yu. K. Kabalov V. S. Kurazhkovskaya S. Yu. Stefanovich I. V. Korchemkin E. A. Asabina 《Crystallography Reports》2012,57(4):514-520
A complex study of the synthetic CsMgPO4 phosphate with a ??-tridymite structure type is performed. It is found that CsMgPO4 is an unstable phase. At room temperature in air, it absorbs water and turns into the CsMgPO4 · 6H2O crystal hydrate. The transformation of cubic CsMgPO4 · 6H2O into orthorhombic CsMgPO4 proceeds upon heating to 150°C by the pattern of the first-order phase transition with the dehydration of the specimen. 相似文献
6.
S. V. Valueva A. I. Kipper L. N. Borovikova N. A. Matveeva 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2010,84(12):2110-2115
Comparative studies of the morphological characteristics of selenium- and platinum-containing nanostructures were performed
by molecular optics methods. The nanostructures were based on an ionogenic polymeric stabilizer, poly-N,N,N,N-trimethylmethacryloyloxyethylammonium
methyl sulfate, and a non-ionogenic polymeric stabilizer, oxyethylcellulose. Studies were performed in aqueous solutions at
a fixed ratio between components. The adsorption of a considerable number of polymer macromolecules on nanoparticles with
the formation of superhigh-molecular-weight nanostructures with shapes close to spherical was observed for all the nanosystems
studied. The thermodynamic state of nanosystems was characterized. Certain morphological characteristics of nanostructures
were substantially influenced by the nature of both nanoparticles and polymer matrix. 相似文献
7.
S. V. Valueva L. N. Borovikova M. E. Vylegzhanina T. E. Sukhanova 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2010,84(9):1473-1477
The morphology and thermodynamic characteristics of nanostructures formed as a result of the reduction of the selenium ion
in a selenite-ascorbate redox system in water solutions of polymethacrylic acid were studied by molecular optics and atomic-force
microscopy. The dependence of the morphology of the selenium-containing nanostructures on the mass selenium-to-polymer ratio
(ν) in solution was determined. It was established that a large number of macromolecules (up to 4300) is adsorbed on the selenium
nanoparticles, leading to the formation of nanostructures with super-high molecular mass and an almost spherical form. It
was shown that the density of the nanostructures, as calculated on the basis of the experimental data on the size and molecular
mass of the nanocomposite, depends substantially on the selenium concentrations in the solution. The thermodynamic state of
the solutions of nanostructures is described. 相似文献
8.
D. Yu. Ershov A. I. Kipper L. N. Borovikova O. A. Pisarev 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2013,87(12):2074-2076
The possibility of controlling the dimensions of nanocomplexes of chymotrypsin with selenium nanoparticles by varying the amount of the reducing agent during synthesis, the ratio of the reacting substances’ concentrations, and the pH of the medium is shown by means of static and dynamic light scattering. 相似文献
9.
V. I. Pet’kov E. V. Zhilkin E. A. Asabina E. Yu. Borovikova 《Russian Journal of Inorganic Chemistry》2014,59(10):1087-1093
Complex phosphates Ca0.5 + x Zn x E2 ? x (PO4)3 (E = Ti, Zr) having NaZr2(PO4)3 (NZP) structure have been prepared and characterized by X-ray diffraction, electron probe microanalysis, IR spectroscopy, and differential thermal analysis (DTA). Their phase formation has been studied by X-ray powder diffraction and DTA. The concentration and temperature fields of existence of these NZP phases have been determined: substitution solid solutions exist in the range of compositions where 0 ≤ x ≤ 0.5. The Ca0.7Zn0.2Ti1.8(PO4)3 crystal structure has been refined by the Rietveld method (space group \(R\bar 3\) , a = 8.3636(4) Å, c = 21.9831(8) Å, V = 1331.7(1) Å3, Z = 6). The framework in the NZP structure is built of octahedra, which are populated by titanium and zinc atoms, and PO4 tetrahedra. Calcium atoms occupy extraframework positions. Extensive solid solution formation due to the accommodation of cations(2+) in the interstices within the NZP framework (M) and in the framework-forming octahedra (M′) makes it possible to design a plurality of new M0.5 + x M′ x E2 ? x (PO4)3 phosphates with tailored structures. 相似文献
10.
We obtain formulas for the expectation and the second moment function of the solution of the Cauchy problem for an inhomogeneous
differential heat equation with two phase variables and with independent Gaussian random coefficients. 相似文献