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1.
We investigate the properties of maximum likelihood estimators in observation schemes of random variables that arrive at random time moments on a Poisson trajectory defined on some ergodic process.Translated from Vychislitel'naya i Prikladnaya Matematika, No. 59, pp. 98–105, 1986. 相似文献
2.
I. D. Shingarova I. V. Yartseva M. P. Nemeryuk A. L. Sedov T. S. Safonova G. A. Osipov Yu. Yu. Volodin M. N. Preobrazhenskaya 《Chemistry of Heterocyclic Compounds》1984,20(11):1287-1294
1-Nucleosides of 5-substituted 4-chloro-1,2,3-triazoles were produced by glycosylation of the corresponding triazoles by the method of fusion with tetra-0-acyl-D-ribofuranose in the presence of bis-p-nitrophenyl phosphate. The structure of the compounds obtained and their conformational peculiarities were studied by the methods of mass spectrometry and NMR spectroscopy.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 11, pp. 1556–1564, November, 1984. 相似文献
3.
T. P. Makarova L. D. Preobrazhenskaya A. V. Lovtsyus A. M. Fridkin A. V. Stepanov A. A. Lipovskii B. N. Belyaev 《Journal of Radioanalytical and Nuclear Chemistry》1983,80(1-2):173-182
In this report the procedures and the methodology of our versions of alpha- and mass-spectrometric techniques for destructive analysis of VVER spent fuel are discussed. These techniques allow the determination of the content of americium and curium isotopes with relative error 3–5%, that of plutonium isotopes with error ≤1% and of uranium isotopes ?0.3–0.4%. They allow one to determine the fuel burn-up using148Nd monitor with relative error not exceeding 2% at confidence level P=0.95. The investigation was directed at the increase of sensitivity of analysis to ensure that the amount of analysed material should be equivalent to ~1 mg of irradiated uranium at mean burn-up values. These techniques are based on the isotope dilution method. 相似文献
4.
F. F. Blanko I. A. Korbukh M. N. Preobrazhenskaya H. Dorn 《Chemistry of Heterocyclic Compounds》1981,17(11):1102-1104
N-Glucoside analogs of the antibiotic pyrazofurine were obtained by fusion of 3-hydroxy-4-ethoxycarbonylpyrazole with tetra-O-acetyl-ß-D-ribofuranose in the presence of iodine.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 11, pp. 1512–1514, November, 1981. 相似文献
5.
Intramolecular cyclization reactions of 3,4-bis(indol-3-yl)maleimides 1, 3-(indol-1-yl)-4-(indol-3-yl)maleimides 2, and 3,4-bis(indol-1-yl)maleimides 3 under the action of protic acids were studied in order to estimate the parameters of the interaction between protonated and
unprotonated indole moieties. Geometric parameters, charge distributions, energy characteristics, and information concerning
the frontier orbitals of bisindolylmaleimides 1–3 were obtained from density functional B3LYP/6-31G(d) quantum chemical calculations. Alternative pathways of protonation of
bisindolylmaleimides with differently bonded indole and maleimide moieties were studied and pathways of cyclization of corresponding
conjugated acids leading to polyannelated compounds were analyzed. All the key intermediates of the cyclization reactions
correspond to stationary points on the potential energy surfaces (minima and transition states). Analysis of the potential
energy surfaces revealed almost linear dependences of the activation energies of the cyclization reactions under study on
the distances between the reaction centers, on the angle of approach of intramolecular electrophile, and on the energy gap
(energy difference between frontier orbitals). The key role in the cyclization reactions is played by structural similarity
between the starting indoleninium cations and the activated complexes of the reactions under study.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 5, pp. 754–760, May, 2006. 相似文献
6.
L. N. Yudina E. I. Lazhko A. M. Korolev M. N. Preobrazhenskaya 《Chemistry of Heterocyclic Compounds》2002,38(10):1200-1204
The methylation and allylation of 6-(3-indolyl)indolo[2,3-b]carbazole were studied, and its trimethyl and mono-, di-, and triallyl derivatives were obtained. 相似文献
7.
Series of 3-arylalkyl- or 3-alkylamino-4-(indol-1-yl)maleimides and bis(indol-1-yl)maleimides were synthesised. The cyclization of the 3-substituted 4-(indol-1-yl)maleimides under the action of acids resulted in the formation of diazepine[1,4] derivatives with indoline and maleimide nuclei annelated. These compounds readily produced the corresponding indolomaleimidodiazepines[1,4] after dehydrogenation. 相似文献
8.
9.
The major achievements of the G. F. Gauze Scientific-Research Institute of New Antibiotics, Russian Academy of Medical Sciences, over the last 50 years are reviewed. The structures of antibiotics and related compounds discovered at the Institute and important for medical practise and/or of theoretical interest as new compounds with high biological activity are described.Dedicated to the memory of Director of the G. F. Gauze Scientific-Research Institute of New Antibiotics, Russian Academy of Medical Sciences, and Corresponding Member of the Russian Academy of Medical Sciences Prof. Yu. V. Dudnik (1938–2003).Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 11, pp. 1603–1618, November, 2004. 相似文献
10.
M. N. Preobrazhenskaya S. N. Lavrenov A. M. Korolev 《Chemistry of Heterocyclic Compounds》2002,38(8):900-903
The 1-N-carbohydrate-containing ascorbigens 1-N-(-D-glucopyranosyl)ascorbigen and 1-N-(1-deoxy-2,3,4,5,6-penta-O-acetyl-D-galactit-1-yl)ascorbigen were synthesized. 相似文献