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51.
52.
S. F. Baranovskii P. A. Bolotin M. P. Evstigneev D. N. Chernyshev 《Journal of Applied Spectroscopy》2008,75(2):251-260
We have used spectrophotometry to study self-association and complexation with DNA by organic heterocyclic compounds in the
acridine and phenothiazine series: proflavin, thionine, and methylene blue. Based on the experimental concentration dependences
of the molar absorption coefficient of the molecules in an aqueous buffer solution (0.01 M NaCl, 0.01 M Na2EDTA, 0.01 M Tris, pH 7.4, T = 298 K), we have determined the equilibrium dimerization constants for the dyes and the DNA
complexation parameters using the Scatchard and McGhee-von Hippel models. The observed increase in the cooperativity parameters
as the dimerization constants of the ligands increase allowed us to hypothesize that the same interactions occur between dye
molecules adsorbed on DNA as in their self-association. The equilibrium DNA-binding constants for the ligands, obtained using
the McGhee-von Hippel cooperative model, are (20.9 ± 2.7)·103 M−1 for proflavin and (33.8 ± 4.1)·103 M−1 for thionine. Using the Scatchard model, taking into account intercalation and “external” binding of ligands with DNA, we
determined the DNA complexation constants for methylene blue: (26.4 ± 4.6)·103 and (96 ± 17)·103 M−1 respectively. Based on analysis of the data obtained, we hypothesized that the predominant type of binding with DNA is intercalation
binding in the case of proflavin and thionine, and “external” binding with the DNA surface in the case of methylene blue.
__________
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 75, No. 2, pp. 242–249, March–April, 2008. 相似文献
53.
54.
D. S. Bolotin 《Russian Journal of Coordination Chemistry》2018,44(4):243-251
Metal-mediated reactions of amidoximes with nitrile ligands are discussed and recent works of the author are considered to allow the reader to better understand the amidoxime reactivity patterns. General routes of activation of amidoxime and nitrile substrates in the studied reactions are considered. Reactions employing amidoximes as HO- and HN-nucleophiles, as well as reactions of amidoximes with nitrile ligands leading to heterocyclic systems are discussed. 相似文献
55.
Dzh. N. Konshina A. V. Danilova Z. A. Temerdashev S. N. Bolotin A. A. Gurinov V. V. Konshin 《Russian Journal of Applied Chemistry》2016,89(4):590-597
A new sorption material, silica gel with covalently immobilized formazan group, was suggested and characterized. The material was prepared by coupling the immobilized aryldiazonium salt with benzaldehyde phenylhydrazone. The equilibrium and kinetic characteristics of the sorption of Cu(II), Co(II), Ni(II), and Cd(II) from solutions onto the modified silica gel were determined. The material proved to efficiently concentrate Cu(II) from multicomponent solutions. The coordination surrounding of Cu(II) in the complex on the sorbent surface was determined by ESR. 相似文献
56.
I. S. Petriev S. N. Bolotin V. Y. Frolov M. G. Barishev V. A. Isaev G. F. Kopytov 《Bulletin of the Russian Academy of Sciences: Physics》2016,80(6):624-626
Thin films of Pd–23% Ag composition are obtained by means of magnetron sputter deposition. The surfaces of the films are modified via the electrolythic deposition of finely divided palladium. The hydrogen permeabilities of samples of membranes (both smooth and modified with palladium black) are compared. A marked increase in the hydrogen permeability of the modified membrane is observed, compared to the smooth membrane. The dependence of the rate of hydrogen fluence on the excess pressure is approximated by a curve of the first order, demonstrating the limitations of the process of hydrogen permeation by hydrogen superficial dissociation. 相似文献
57.
On the multiplicity of periodic solutions of mountain pass type for a class of semilinear PDE’s 总被引:1,自引:0,他引:1
We prove the existence of many mountain pass periodic solutions for a semilinear elliptic PDE on a torus.
The first author was supported by the National Science Foundation grant #0300319 and by the RFBR grant #050101119. The second
author was supported by the NSF grant #MCS-8110556. 相似文献
58.
A model of corrosion fatigue is proposed which takes into account the main phenomena of a mechanical nature, namely, the transfer of the active agent from the month of the crack to its tip, the accumulation of mechanical damage due to cyclic loads and the breakdown of the stability conditions in the body-with-cracks — load — environment system as the reason for the propagation of the crack tip. Particular attention is devoted to the mechanism by which active agent is transferred. In addition to diffusion, convective transfer as a consequence of the change in the shape and dimensions of the crack cavity is taken into account. The results of modelling are supplemented with diagrams, which relate the rate of growth of the crack with the range of the stress intensity factor, the concentration of the agent at the mouth of the crack and the characteristics of the cycle, equal to the ratio of the extremal values of the applied stresses in each cycle. The results are compared with experimental data. 相似文献
59.
Maria Letizia Bertotti Sergey V. Bolotin 《Archive for Rational Mechanics and Analysis》2000,152(1):65-79
Natural Lagrangian systems (T,Π) on R
2 described by the equation are considered, where is a positive definite quadratic form in and Π(q) has a critical point at 0. It is constructively proved that there exist a C
∞ potential energy Π and two C
∞ kinetic energies T and such that the equilibrium q(t)≡ 0 is stable for the system (T,Π) and unstable for the system . Equivalently, it is established that for C
∞
natural systems the kinetic energy can influence the stability. In the analytic category this is not true.
Accepted: October 20, 1999 相似文献
60.
A. E. Stuchbery T. H. Heseltine S. S. Anderssen H. H. Bolotin A. P. Byrne B. Fabricius T. Kibédi 《Hyperfine Interactions》1994,88(1):97-119
Transient magnetic fields were measured for W, Os and Pt ions traversing iron hosts with average velocities in the range from approximately 1.6v
0 to 4.8v
0 (v
0=c/137, Bohr velocity). Transient fields for W and Os in Fe are consistent with behaviour found for lighter rare-earth ions and are about 20% stronger than those for Pt in Fe over the majority of the velocity range examined. A measurement was made to confirm that possible heavy-ion beam induced attenuations of the transient field are negligible for low-velocity Pt ions excited by Ni beams. Results are discussed in terms of both empirical and model-based parameterizations of the transient field strength. 相似文献