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1.
I. G. Uryukina A. M. Simonov R. A. Ovchinnikova 《Chemistry of Heterocyclic Compounds》1972,8(11):1408-1410
7-Substituted imidazo [1,2-a]quinoxalines were synthesized. Transformations of compounds of this series — quaternization, reduction to 4,5-dihydro derivatives, and behavior toward oxidizing agents — were studied.See [1] for communication I.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 11, pp. 1558–1560, November, 1972. 相似文献
2.
G. I. Ovchinnikova N. V. Belugina R. V. Gainutdinov E. S. Ivanova V. V. Grebenev A. K. Lashkova A. L. Tolstikhina 《Physics of the Solid State》2016,58(11):2244-2250
A hydrogen-containing ferroelectric triglycine sulfate (TGS) was comprehensively studied with an atomic force microscopy (AFM) and dielectric spectroscopy. The domain structure dynamics was in situ investigated with piezoresponse force microscopy (PFM) during heating and cooling the TGS crystal near phase transition. Relaxation dependencies of domain boundaries general perimeter and domain dimensions were obtained. TGS dielectric spectra measured at the frequency range from 10 to 1011 Hz were analyzed on basis of significant contribution of conductivity into the dielectric response of ferroelectrics and a good agreement with the experimental data was received. It allows us to obtain more information about temperature dynamics of the domain structure. 相似文献
3.
N. L. Ovchinnikova M. A. Kuchenkova P. Kh. Yuldashev 《Chemistry of Natural Compounds》1978,13(4):467-471
Summary From a chymotryptic hydrolyzate of the CM-7S-globulin of cotton seeds we have isolated and characterized in relation to amino-acid composition and N-terminal amino acids 65 homogeneous peptides, 38 of which contain arginine or lysine residues and are overlapping.Institute of the Chemistry of Plant Substances, Academy of Sciences of the Uzbek SSR, Tashkent. Translated from Khimiya Prirodnykh Soedinenii, No. 4, pp. 560–566, July–August, 1977. 相似文献
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A new type of x-ray spectroscopy is proposed which can detect the thermal-motion-induced distortions of atomic electronic
states in crystals. It is shown that those distortions can cause extra Bragg reflections (so-called forbidden reflections)
and that their intensity should grow with increasing temperature. The reason is that the thermal displacements, which change
the symmetry of atomic environment, can modify the tensor amplitude of x-ray resonant scattering. In the first approximation,
the structure factor of extra reflections is proportional to the reflection vector H and to the mean-square thermal displacement
for optical phonons. It is demonstrated that the forbidden resonant reflections, observed recently in Ge, could be caused
by the thermal motion.
Pis’ma Zh. éksp. Teor. Fiz. 69, No. 12, 885–889 (25 June 1999)
Published in English in the original Russian journal. Edited by Steve Torstveit. 相似文献
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D. L. Chizhov P. A. Slepukhin I. G. Ovchinnikova O. V. Fedorova G. L. Rusinov V. I. Filyakova V. N. Charushin 《Russian Chemical Bulletin》2010,59(11):2122-2125
O-Alkylation of 2-acetylphenols with α,ω-dichloro derivatives of oligoethylene glycols in the presence of KOH and Al2O3 in DMF gave the corresponding podands. Their condensation with ethyl trifluoroacetate afforded fluorine-containing bis(β-diketones)
with the aryl fragments linked by conformationally flexible polyether spacers. 相似文献
10.
E. Kh. Mukhamedzhanov M. V. Kovalchuk M. M. Borisov E. N. Ovchinnikova E. V. Troshkov V. E. Dmitrienko 《Crystallography Reports》2010,55(2):174-181
Purely resonant Bragg reflections 006, 5$
\bar 5
$
\bar 5
0, and 666 in a rubidium dihydrophosphate (RbH2PO4) crystal at the K edge of rubidium have been experimentally and theoretically investigated. These reflections remain forbidden when the resonant
dipole-dipole (E1E1) contribution to the resonant atomic factor is taken into account; they may be due to the dipole-quadrupole (E1E2) transitions as well as to the anisotropy atomic factor, which is caused by thermal atomic displacements (thermally induced
contribution) and/or local jumps of hydrogen atoms. A numerical simulation showed that, at room temperature (experimental
conditions), the thermally induced contribution to the “forbidden” reflections is dominant. 相似文献