排序方式: 共有46条查询结果,搜索用时 15 毫秒
1.
N. A. Tyukavkina K. I. Lapteva V. A. Larina N. G. Devyatko 《Chemistry of Natural Compounds》1968,3(5):252-254
Summary The quantitative determination of quercetin and dihydroquercetin in the total flavonoids ofLatrix dahurica has been effected by the use of thin-layer chromatography on Kapron for separating the mixture with subsequent elution of the spots and colorimetry of the eluates obtained. The methanol-dimethylformamide (1:1) system was used as the eluate. It has been found that the flavonoids of the heartwood ofLatrix dahurica contain a predominating amount, 69% of dihydroquercetin, the amount of quercetin being 11%.Khimiya Prirodnykh Soedinenii, Vol. 3, No. 5, pp. 298–301, 1967 相似文献
2.
The enthalpies of combustion (ΔH
comb) of five primary, secondary, and tertiary alkyl(aryl)arsines in the condensed state were calculated using the equation ΔH
comb = −385.8–110.3N, where N is the number of bond-forming electrons. The dependence presented is used for the calculation of the enthalpies of combustion
of full esters and amidoesters of arsinous acid of noncyclic and cyclic structures.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 5, pp. 1042–1043, May, 2007. 相似文献
3.
E. V. Kosheleva M. A. Pentin L. A. Kalinina T. V. Mikhailichenko T. A. Lapteva Yu. N. Ushakova 《Russian Journal of Electrochemistry》2017,53(7):790-798
The chemical method of preparation of oxide precursors was used to obtain sulfide-conducting ionic salts of CaY2S4, BaSm2S4 and heterogeneous additives of ZrS2 and SiS2, accordingly. The sintering modes for obtaining the heterogeneous systems of CaY2S4–ZrS2 and BaSm2S4–SiS2 were chosen. Samples were characterized using the methods of X-ray phase analysis and microprobe analysis. The methods of thermogravimetric and differential thermal analysis were used to determine thermal stability of samples. The temperature and concentration dependences of conductivity and average ionic transport numbers were studied. The range of compositions of heterogeneous mixtures is determined in which conductivity considerably exceeds conductivity of the basic sulfide-conducting solid electrolytes. 相似文献
4.
Lapteva U. A. Baranov A. Yu. Samsonenko D. G. Artemev A. V. 《Journal of Structural Chemistry》2022,63(4):663-668
Journal of Structural Chemistry - A four-nuclear complex [Ag4(Lut3P)2(MeCN)2](BF4)4 is synthesized by treating tris[(6-methylpyridin-2-yl)methyl]phosphine (Lut3P) with AgBF4 in a MeCN solution. The... 相似文献
5.
6.
7.
A new type of a linear relation between the components of the magnetic field vector and those of the elastic strain tensor (a dynamic piezomagnetic interaction) is proposed. This relation is irrespective of the crystal symmetry and of the presence of a magnetic structure in the dielectric medium. This leads to anomalies in the reflection of a beam of shear bulk waves incident from the depth of the nonmagnetic dielectric medium on either its mechanically free surface or its slip boundary with a semibounded magnetic medium. 相似文献
8.
N. V. Belykh T. V. Lapteva O. S. Tarasenko S. V. Tarasenko 《Crystallography Reports》2007,52(5):864-869
Specific features of localization and propagation of a shear bulk wave induced by magnetoelastic interaction in the case where the elastic wave length is comparable with the superlattice period have been investigated by the example of a limited 1D acoustically continuous magnetic superlattice of the easy-axis-antiferromagnet-ideal-metal type with a mechanically free surface. 相似文献
9.
The enthalpies of combustion (H
comb) of 13 primary, secondary, and tertiary alkylphoshines in the condensed state were calculated using the equation H
comb = –860.7 – 107.0N, where N is the number of valent (bond-forming) electrons. This equation can be used for the calculation of enthalpies of combustion and formation of phosphoric acid esters.Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 8, pp. 1693–1694, August, 2004. 相似文献
10.
V. V. Ovchinnikov L. I. Lapteva E. Yu Sitnikova 《Phosphorus, sulfur, and silicon and the related elements》2013,188(1)
Abstract The solvation in hexane, vaporization and formation enthalpies for some derivatives of dithiophosphorus compounds are determined and discussed. 相似文献