共查询到20条相似文献,搜索用时 31 毫秒
1.
Yu-Feng Hu Xian-Ming Zhang Chuan-Wei Jin Xiao-Ming Peng 《Journal of solution chemistry》2010,39(12):1828-1844
Viscosities were measured for the ternary aqueous systems NaCl–mannitol(C6H14O6)–H2O, NaBr–mannitol–H2O, KCl–mannitol–H2O, KCl–glycine(NH2CH2COOH)–H2O, KCl–CdCl2–H2O, and their binary subsystems NaCl–H2O, KCl–H2O, NaBr–H2O, CdCl2–H2O, mannitol–H2O, and glycine–H2O at 298.15 K. A powerful new approach is presented for theoretical modeling of the viscosity of multicomponent solutions
in terms of the properties of their binary solutions. In this modeling, the semi-ideal solution theory was used to associate
the solvation structure formed by each ion and its first solvation shell in a binary solution with the solvation structure
of the same ion and its first solvation shell in multicomponent solutions. Then, the novel mechanism proposed by Omta et al.
(Science, 301:347–349, 2003) for the effect of a single electrolyte on the viscosity of water was extended to describe the influence of solute mixtures
on the viscosity of water, including electrolyte mixtures, nonelectrolyte mixtures, and mixtures of electrolytes with nonelectrolytes.
The established simple equation was verified by comparison with measured viscosities and viscosities reported in literature.
The agreements are very impressive. This formulation provides a powerful new approach for modeling this transport property
in solutions. It can stimulate further research in establishing a dynamical analogue to that formulated for the thermodynamics
of multicomponent solutions. It is also very important for the study of hydration of ions. 相似文献
2.
Neoflavone β-D-glucopyranosides, β-D-galactopyranosides, β-D-xylopyranosides, and α-D-arabinopyranosides were synthesized
by Michael condensation of potassium salts of 7-hydroxy-4-arylcoumarins with acetobromosugars followed by deacetylation of
the resulting peracetates.
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Translated from Khimiya Prirodnykh Soedinenii, No. 6, pp. 546–550, November–December, 2005. 相似文献
3.
The lactone 20R-25-norcycloartan-3β,6α,16β-triol-20,24-olide was synthesized from cyclosiversigenin.
Presented at the 1st International Symposium on Edible Plant Resources and the Bioactive Ingredients, Xinjiang, China, July
25–27, 2008.
Translated from Khimiya Prirodnykh Soedinenii, No. 3, pp. 324–327, May–June, 2009. 相似文献
4.
L. A. Yakovishin V. I. Grishkovets N. N. Arnautov V. Ya. Chirva 《Chemistry of Natural Compounds》1999,35(5):587-588
Triterpene glycosides from leaves of canary ivyHedera canariensis Willd. were previously isolated and characterized [1–4]. The glycosidic composition of the plant stems is reported in the
present article.
Translated from Khimiya Prirodnykh Soedinenii, No. 5, pp. 676–678, September–October, 1999. 相似文献
5.
I. V. Nagorichna A. A. Tkachuk M. M. Garazd Ya. L. Garazd V. P. Khilya 《Chemistry of Natural Compounds》2009,45(2):152-157
Spiropyranobenzopyrandiones were prepared, reduced, and dehydrated to form spirosubstituted pyranocoumarins.
Translated from Khimiya Prirodnykh Soedinenii, No. 2, pp. 135–139, March–April, 2009. 相似文献
6.
M. V. Veselovskaya M. M. Garazd V. I. Vinogradova V. P. Khilya 《Chemistry of Natural Compounds》2006,42(3):277-280
Cytisine derivatives modified by furocoumarins were synthesized using activated esters.
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Translated from Khimiya Prirodnykh Soedinenii, No. 3, pp. 230–232, May–June, 2006. 相似文献
7.
I. P. Dubovik M. M. Garazd V. I. Vinogradova V. P. Khilya 《Chemistry of Natural Compounds》2006,42(2):133-137
N-Acetyl derivatives of cytisine modified by coumarins were synthesized.
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Translated from Khimiya Prirodnykh Soedinenii, No. 2, pp. 110–113, March–April, 2006. 相似文献
8.
U. A. Baltaev 《Chemistry of Natural Compounds》1991,27(6):712-713
A new ecdysteroid (rhapisterone B) has been isolated from the seeds ofRhaponticum cathamoides (Willd.) Iljin. (familyCompositae). It has been shown that it is 2β, 3β, 11α, 14α, 20R, 24ξ-hexahydroxy-5β-cholest-7-en-6-one.
Institute of the Chemistry of Plant Substances, Uzbek Academy of Sciences, Tashkent. Translated from Khimiya Prirodnykh Soedinenii,
No. 6, pp. 806–808, November–December, 1991. 相似文献
9.
A. É. Timbekova M. F. Larin M. R. Yagudaev N. K. Abubakirov 《Chemistry of Natural Compounds》1989,25(5):573-576
A new triterpene glycoside — medicoside H — has been isolated from the roots ofMedicago sativa L. (Fabaceae), and on the basis of chemical transformations and spectral characteristics its structure has been established
as medicagenic acid 3-O-β-D-glucopyranoside 28-O-[O-α-L-rhamnopyronosyl-(1 → 2)-β-L-arabino-pyranoside].
Institute of the Chemistry of Plant Substances, Academy of Sciences of the Uzbek SSR, Tashkent. Translated from Khimiya Prirodnykh
Soedinenii, No. 5, pp. 673–677, September–October, 1989. 相似文献
10.
M. V. Telezhenetskaya A. L. D'yakonov S. Yu. Yunusov 《Chemistry of Natural Compounds》1989,25(6):729-729
Institute of the Chemistry of Plant Substances, Uzbek SSR Academy of Sciences, Tashkent. Translated from Khimiya Prirodnykh
Soedinenii, Vol. 6, pp. 857–858, November–December, 1989. 相似文献
11.
A novel method using liquid chromatography coupled with atmospheric pressure chemical ionization mass spectrometry in the
negative selected ion monitoring mode has been developed and validated for rapid simultaneous determination of triptolide
and tripdiolide in the extract of Tripterygium wilfordii Hook. f. The molecular ions m/z [M–H]− 359 and 375 were selected for the quantification in selected ion monitoring mode for triptolide and tripdiolide. Standard
calibration curve was linear over the concentration range of 0.12–24 and 0.15–30 μg mL−1 for triptolide and tripdiolide. The relative standard deviations of intra- and inter-day were in the range of 4.7–9.9 and
8.9–12.6%. The average recoveries were between 96.4 and 104.6%. The limits of quantitation were 2.0 × 10−3 and 2.5 × 10−3 μg mL−1 for triptolide and tripdiolide. 相似文献
12.
Jerzy Jurczyk Rafał Sitko Beata Zawisza Franciszek Buhl Ewa Malicka 《Mikrochimica acta》1999,132(1):41-47
A simple and quick method of durable samples preparation by the thin layer method through direct digesting of the analysed
material on the substrate has been presented. Four- and three-component mono- and polycrystals have been analysed. Standards
have been used in calibration containing: Cr, Co, Ni, Cu, Zn, Ga, Se, Sb, Yb. To improve the correlation between the concentration
and the fluorescent radiation models of mathematical corrections have additionally been used: multiple linear regression,
Lucas-Tooth-Pyne model (L. T. P.) and de Jongh model (d. J.).
Statistical parameters: detection limits for 0.5 mg samples: Cr–0.041%, Co–0.034%, Ni–0.042%, Cu–0.053%, Zn–0.054%, Ga–0.057%,
Se–0.057%, Sb–0.113%, Yb–0.077%. Correlation coefficients: simple regression 0.9946–0.9997, multiple regression 0.9974–1.0000,
L. T. P. 0.9993–1.0000, d. J. 0.9995–1.0000.
Received August, 1, 1998. Revision March 25, 1999. 相似文献
13.
Institute of the Chemistry of Plant Substances, Uzbek SSR Academy of Sciences, Tashkent. Translated from Khimiya Prirodnykh
Soedinenii, No. 4, pp. 588–589, July–August, 1988. 相似文献
14.
Institute of the Ecology of the Volga Basin, Russian Academy of Sciences, Tol'yatti. Translated from Khimiya Prirodnykh Soedinenii,
No. 6, pp. 850–852, November–December, 1991. 相似文献
15.
M. A. Agzamova M. I. Isaev I. I. Mal'tsev M. B. Gorovits N. K. Abubakirov 《Chemistry of Natural Compounds》1988,24(6):755-756
Institute of the Chemistry of Plant Substances, Academy of Sciences of the Uzbek SSR, Tashkent. Translated from Khimiya Prirodynkh
Soedinenii, No. 6, pp. 882–883, November–December, 1988. 相似文献
16.
Institute of the Chemistry of Plant Substances, Academy of Sciences of the Uzbek SSR, Tashkent. Translated from Khimiya Prirodynkh
Soedinenii, No. 6, pp. 880–882, November–December, 1988. 相似文献
17.
U. T. Teshebaeva A. N. Sultankhodzhaev A. A. Nishanov 《Chemistry of Natural Compounds》1999,35(6):659-660
A new alkaloid called akiramidine is isolated from the aerial part ofAconitum kirinense. The structure 6β,14α,16β-trimethoxy-1α,4β,8β-trihydroxy-N-ethylaconitane is proposed based on spectral data and confirmed
by chemical transformation from akiramine.
Translated from Khimiya Prirodnykh Soedinenii, No. 6, pp. 774–776, November–December, 1999. 相似文献
18.
Cycloadsurgenin, 20R,24 S-epoxycycloartan-6α,25-diol-3,16-dione, was partially synthesized in four steps from cyclosieversigenin. Side products with the structures 17E,24S-cycloart-17-en-6α,24,25-triol-3,16-dione and 17Z,24 S-cycloart-17-en-6α,24,25-triol-3,16-dione were obtained in addition to the desired product.
Presented at the 1st International Symposim on Edible Plant Resources and the Bioactive Ingredients, Xinjiang, China, July
25–27, 2008.
Translated from Khimiya Prirodnykh Soedinenii, No. 6, pp. 591–595, November–December, 2008. 相似文献
19.
M. V. Frunze Kishinev Agricultural Institute. Translated from Khimiya Prirodnykh Soedinenii, No. 4, pp. 582–584, July–August,
1989. 相似文献
20.
Lipids of marine macrophytic algae. II. Fatty-acid and phospholipid composition of the chlorophyceae
V. M. Dembitskii O. A. Rozentsvet E. E. Pechenkina 《Chemistry of Natural Compounds》1990,26(3):336-337
Institute of the Ecology of the Volga Basin, USSR Academy of Sciences, Tol'yatti. Translated from Khimiya Prirodnykh Soedinenii,
No. 3, pp. 403–404, May–June, 1990. 相似文献