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排序方式: 共有142条查询结果,搜索用时 15 毫秒
91.
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Alexander Vladimirovich Ivanov Mariya Petrovna Kruglova Edward Danielevich Virus Polina Olegovna Bulgakova Sergei Vital'evich Grachev Aslan Amirkhanovich Kubatiev 《Electrophoresis》2020,41(3-4):209-214
A new approach for direct determination of S-adenosylmethionine (SAM), S-adenosylhomocysteine (SAH), and methylthioadenosine (MTA) in urine was developed based on MEKC by using SDS modified with isobutanol in the presence of PEG-300. Analytes were first extracted with grafted phenylborononic acid. Using a 50 µm internal diameter silica capillary of 32 cm total length filled with 0.05 M SDS, 0.05 M H3PO4, 5% (v/v) isobutanol, and 10% (v/v) PEG-300, LOQ of 0.15 µM for SAM and SAH, and 0.2 µM for MTA was reached. Accuracy was 92% for MTA, 109% for SAH, and 105% for SAM, intra- and interday imprecision were <2.5 and ≤3%, respectively. The total time of analysis for one sample was 10 min. Analysis of 30 urine samples from healthy volunteers showed that the median SAM and SAH levels were 12.1 and 0.73 µM, respectively. MTA levels, which were determined in urine for the first time (according to our data), were 0.43 µM, and these values correlated well with the SAM level (r = 0.748, p < 0.01). 相似文献
93.
94.
Agarkova Ekaterina A. Borik Mikhail A. Volkova Tatiana V. Kulebyakin Alexey V. Kuritsyna Irina E. Lomonova Elena E. Milovich Filipp O. Myzina Valentina A. Ryabochkina Polina A. Tabachkova Nataliya Yu. 《Journal of Solid State Electrochemistry》2019,23(9):2619-2626
Journal of Solid State Electrochemistry - The crystalline structure, ionic conductivity, and local structure of ZrO2-Gd2O3solid solution crystals have been studied for a wide range of compositions.... 相似文献
95.
M. K. Kurbanaliev A. A. Tager B. N. Narzullaev N. S. Rasulov I. K. Dustov V. E. Dreval' A. A. Anikeeva 《Mechanics of Composite Materials》1973,9(2):320-322
The authors examine the influence of the nature of the solvent on the time dependence of the strengths of films obtained from solutions of cellulose acetate in various solvents. They found that the durability of the films depends on the nature of the solvent. They have established that as the thermodynamic affinity of the solvent in the film-forming solutions gets worse, the durability of the films passes through a maximum; the nature of the solvent influences the parameter in the equation for the durability, which is responsible for changes in the structure of the polymer.V. I. Lenin Tadzhik State University, Dushanbe. A. M. Gor'kii Ural State University, Sverdlovsk. Translated from Mekhanika Polimerov, No. 2, pp. 360–362, March–April, 1974. 相似文献
96.
E. I. Zhmurikov A. I. Romanenko P. V. Logachev K. V. Gubin O. B. Anikeeva Tecchio Luigi 《Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques》2007,1(1):60-63
The conductivity of graphite composite samples MPG-6 and MPG-7 has been measured before and after 1.4 MeV electron irradiation and heating by alternating current up to temperatures higher than 2500°C, causing the fracture of the samples. It has been shown that both heating and electron irradiation result in a shift of the temperature dependence of the conductivity of the samples, namely, in an increase in conductivity. The measurements of the relative magnetoresistance at helium temperature in fields of ±1.15 T have shown that the imperfection of the macrostructure increases. The noticeable changes in the x-ray phase diagram do not observed up to the fracture of the samples. All the obtained data make it possible to suppose that the ultimate strength and the lifetime of graphite composites are limited by intercrystalline or grain boundaries. 相似文献
97.
98.
Alan J. Jones Clifford C. Leznoff Polina I. Svirskaya 《Magnetic resonance in chemistry : MRC》1982,18(4):236-240
The 13C NMR spectra of a wide variety of organic substrates bound to 2% cross-linked polystyrenes may be obtained routinely, provided the resins can be sufficiently swollen. The 13C chemical shifts of polymer-bound trityl alcohol, polymer-bound monotrityl ethers of the symmertrical diols HO (CH2)nOH (n=2, 4, 6, 7, 9 and 10), and some related intermediates in the solid phase synthesis of insect pheromones are presented. 13C shift additivity correlations, differing little from those in free trityl ethers, are drawn. 相似文献
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100.