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N. A. Vavilova M. V. Ustinova T. M. Voinova N. N. Stepanichenko L. N. Ten S. Z. Mukhamedzhanov V. G. Dzhavakhiya 《Chemistry of Natural Compounds》1989,24(4):487-491
A polyketide exometabolite — 3,4,8-trihydroxy-3,4-dihydronaphthalen-1(2H)-one (3,4,8-TDH) — has been isolated from the culture liquids of four isolates of the phytopathogenic fungusPiricularia oryzae Cavara. It has been shown that all the natural isolates investigated, and also nonpathogenic rose mutants and a series of dwarf mutants synthesize 3,4,8-TDH. This substance was not detected in filtrates of cultures of albino mutants. One of the natural isolates produces, together with 3,4,8-TDH, another polyketide — piriculol. The role in pathogenesis of the exometabolites isolated is discussed.All-Union Scientific-Research Institute of Phytopathology of Gosagroprom SSR. Golitsyno. V. I. Lenin Tashkent State University. Translated from Khimiya Prirodnykh Soedinenii, No. 4, pp. 572–577, July–August, 1988. 相似文献
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Carlsson N Sanandaji N Voinova M Akerman B 《Langmuir : the ACS journal of surfaces and colloids》2006,22(9):4408-4414
Porous hydrogels such as agarose are commonly used to analyze DNA and water-soluble proteins by electrophoresis. However, the hydrophilic environment of these gels is not suitable for separation of important amphiphilic molecules such as native membrane proteins. We show that an amphiphilic liquid crystal of the lipid monoolein and water can be used as a medium for electrophoresis of amphiphilic molecules. In fact, both membrane-bound fluorescent probes and water-soluble oligonucleotides can migrate through the same bicontinuous cubic crystal because both the lipid membrane and the aqueous phase are continuous. Both types of analytes exhibit a field-independent electrophoretic mobility, which suggests that the lipid crystal structure is not perturbed by their migration. Diffusion studies with four membrane probes indicate that membrane-bound analytes experience a friction in the cubic phase that increases with increasing size of the hydrophilic headgroup, while the size of the membrane-anchoring part has comparatively small effect on the retardation. 相似文献
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Angular correlation measurements of K- and L-conversion electrons following the decay 192Ir → 192Pt have been made using a spectrometer with Ge(Li) and Si (Li) detectors. Absolute and relative internal conversion coefficients of transitions in 192Pt were measured, using an ICC and prism β-spectrometers, to ≈ 2 % and values of δγ determined from the relative ICC. The experimental values measured in the study, A22(K296γ316) = 0.138 ± 0.010, A22(L296γ316) = 0.125 ± 0.013, αK(296) = 0.0711 ± 0.0011, K/LIII = 9.65 ± 0.13. With δγ = + 5.4 ± 0.2, were employed for determining the E0/E2 amplitude ratios of conversion transitions, q(E0/E2), and the penetration parameter λ of the Ml component for the 2+' → 2+ (296 keV) transition in 192Pt. The angular correlation measurements of L-conversion electrons enabled the elimination of one of two ranges of values of q and λ usually obtained. For the first time in our work, analysis of the eLγ angular correlation for the determination of the E0 component in the transition was carried out. As a result, q = +0.04 ± 0.05 with λ = ?4.5 ± 3.5 was obtained for the 296 keV transition. In this case, ρ(E0) = 0.004 ± 0.005 agrees with ρ(E0) = +0.006 determined theoretically by Kumar and Baranger for the 2+' → 2+ transition 相似文献
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Vera V. Voinova Nikita A. Selivanov Ivan V. Plyushchenko Mikhail F. Vokuev Alexander Yu. Bykov Ilya N. Klyukin Alexander S. Novikov Andrey P. Zhdanov Mikhail S. Grigoriev Igor A. Rodin Konstantin Yu. Zhizhin Nikolay T. Kuznetsov 《Molecules (Basel, Switzerland)》2021,26(1)
The novel members of the 1,2-diboraoxazoles family have been obtained. In the present work, we have carried out the intramolecular ring-closure reaction of borylated iminols of general type [B10H9N=C(OH)R]− (R = Me, Et, nPr, iPr, tBu, Ph, 4-Cl-Ph). This process is conducted in mild conditions with 83–87% yields. The solid-state structures of two salts of 1,2-diboraoxazoles were additionally investigated by X-ray crystallography. In addition, the phenomena of bonding interactions in the 1,2-diboraoxazole cycles have been theoretically studied by the Quantum Theory of Atoms in Molecules analysis. Several local and integral topological properties of the electron density involved in these interactions have been computed. 相似文献
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Zhdanov A. P. Voinova V. V. Klyukin I. N. Buzanov G. A. Grigor’ev M. S. Zhizhin K. Yu. Kuznetsov N. T. 《Russian Journal of Coordination Chemistry》2019,45(8):563-568
Russian Journal of Coordination Chemistry - The formation of complex salt [Ag(PPh3)4][2-B10H9NH3 ? 2DMF] (I) by the reaction of the salts of the [2-B10H9NH3]– anion with [Ag(PPh3)4]NO3... 相似文献
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The notion of elementary map of a dendrite into itself is introduced. Arithmetical relations between the periods of periodic
points are given; the structure ofω-limit sets, sets of periodic and nonwandering points is described; the topological entropy of elementary maps is shown to
be equal to 0. Examples are given illustrating the differences in the entropic properties of continuous maps of dendrites
with a countable set of branch points and continuous maps of their retracts which are finite trees.
Translated fromMatematicheskie Zametki, Vol. 63, No. 2, pp. 183–195, February, 1998.
This research was supported by the Russian Foundation for Basic Research under grant No. 96-01-01755. 相似文献
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V. A. Bazakutsa N. I. Gnidash E. N. Pod'yachaya L. G. Voinova N. V. Kravtsova 《Russian Physics Journal》1991,34(11):992-996
Translated from Izvestiya Vysshikh Uchenbykh Zavedenii, Fizika, No. 11, pp. 53–58, November, 1991. 相似文献
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A.?A.?Pometun N.?S.?Voinova E.?V.?Pometun S.?S.?Savin V.?I.?TishkovEmail author 《Moscow University Chemistry Bulletin》2018,73(4):199-203
The effect of medium pH and ion strength on the thermal stability of formate dehydrogenases (EC 1.2.1.2, FDH) from model plant Arabidopsis thaliana (AthFDH) and soybean Glycine max (SoyFDH) are studied. The dependence of the residual activity on time is described by the kinetics of the reaction of the first order in all the experimental conditions. The dependence of the first order thermal inactivation constants on phosphate buffer concentration has the form of a bell-shaped curve. It was found that an increase in the pH value resulted in an increase and decrase of inactivation rate constans for SoyFDH and AthFDH, respectively. The activation parameters of the thermal inactivation process, ΔH≠ and ΔS≠ are calculated from the experimental data at different medium pH values and phosphate buffer concentrations. 相似文献