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排序方式: 共有370条查询结果,搜索用时 11 毫秒
1.
A. V. Gorshkov V. V. Evreinov I. A. Tarasova M. V. Gorshkov 《Polymer Science Series B》2007,49(3-4):93-107
A peptide separation model based on the technique of liquid chromatography of macromolecules at the critical condition was proposed. In terms of this model, the array of experimental data on the separation of peptides is considered. The main phenomenological parameters of the model—effective adsorption energies of amino acid residues—were determined, thus allowing the influence of character of their alternation in the chain on retention times to be predicted. The model is applicable to investigation into the feasibility of separation in different chromatographic modes of not only peptides with the same amino acid composition and different sequences of units in the chain but also peptides containing amino acid isomers and mirror sequences with different terminal groups. 相似文献
2.
A. I. Syrchina N. N. Pechurina A. L. Vereshchagin A. G. Gorshkov I. É. Tsapalova A. A. Semenov 《Chemistry of Natural Compounds》1993,29(4):535-536
Irkutsk Institute of Organic Chemistry, Siberian Branch, Russian Academy of Sciences. Translated from Khimiya Prirodnykh Soedinenii,
No. 4, pp. 608–609, July–August, 1993. 相似文献
3.
It is shown that processes that are associated with the formation or non-formation of a concentration boundary during isotachophoresis substantially affect the terminator adjustment to a steady-state concentration. 相似文献
4.
Bruce JE Anderson GA Lin CY Gorshkov M Rockwood AL Smith RD 《Journal of mass spectrometry : JMS》2000,35(1):85-94
A new trapped ion cell design for use with Fourier transform ion cyclotron resonance mass spectrometry is described. The design employs 15 cylindrical ring electrodes to generate trapping potential wells and 32 separately assignable rod electrodes for excitation and detection. The rod electrodes are positioned internal to the ring electrodes and provide excitation fields that are thereby linearized along the magnetic field over the entire trapped ion volume. The new design also affords flexibility in the shaping of the trapping field using the 15 ring electrodes. Many different trapping well shapes can be generated by applying different voltages to the individual ring electrodes, ranging from quadratic to linearly ramped along the magnetic field axis, to a shape that is nearly flat over the entire trap volume, but rises very steeply near the ends of the trap. This feature should be useful for trapping larger ion populations and extension of the useful range of ion manipulation and dissociation experiments since the number of stages of ion manipulation or dissociation is limited in practice by the initial trapped ion population size. Predicted trapping well shapes for two different ring electrode configurations are presented, and these and several other possible configurations are discussed, as are the predicted excitation fields based on the use of rod electrodes internal to the trapping ring electrodes. Initial results are presented from an implementation of the design using a 3.5 T superconducting magnet. It was found that ions can be successfully trapped and detected with this cell design and that selected ion accumulation can be performed with the utilization of four rods for quadrupolar excitation. The initial results presented here illustrate the feasibility of this cell design and demonstrate differences in observed performance based upon different trapping well shapes. 相似文献
5.
M. Yu. Gorshkov A. D. Neuimin N. M. Bogdanovich Yu. V. Danilov L. A. Dunyushkina 《Russian Journal of Electrochemistry》2007,43(6):721-728
Oxygen-ion conduction in apatite-like compounds based on silicates and germanates of lanthanum La x A6O12 + 1.5x (A = Si, Ge; x = 9.11–10.22) is studied. The compounds are shown to be purely ionic conductors at 600–900°C and partial oxygen pressures 10?16 to 105 Pa. The electroconductivity of the best conducting specimens of La x A6O12 + 1.5x (A = Si, Ge; x = 9.77–10) exceeds that of electrolyte YSZ at moderate temperatures. The electroconductivity of lanthanum germanate is substantially greater than that of lanthanum silicate, specifically, 7.85 × 10?2 and 2.35 × 10?2 S cm?1, respectively, at 800°C. An inflection is discovered at ~750°C in the temperature dependences of electroconductivity of La x Ge6O12 + 1.5x (x = 9.77–10.22). A dilatometric examination points to a second-kind phase transition that may be due to the oxygen sublattice disordering. The behavior of apatite-like electrolytes La x A6O12 + 1.5x (A = Si, Ge) during long exploitation periods in the interval of working temperatures of electrochemical devices is studied for the first time ever. The electrolytes’ aging at 800°C in air for 1000 h was investigated by the electroconductivity method. The electroconductivity of lanthanum germanates decayed with time by 5% and that of lanthanum silicates, by 9.5%. The steady-state values of electroconductivity of all compounds studied is reached after 600–700 h. The compounds studied form a class of materials that hold some promise as solid electrolytes for medium-temperature fuel cells and other electrochemical devices. 相似文献
6.
I. G. Rozdina N. N. Filatova A. V. Gorshkov V. V. Evreinov 《Polymer Science Series B》2013,55(5-6):400-408
Critical chromatography is used to study the kinetics of reactions between polypropylene glycols and phenyl butyl isocyanate that simulate the production of polyester urethanes. The use of a two-detector version of chromatography makes it possible to monitor the concentration of the original, intermediate, and final oligomers and reveal the effect of one end group on the reactivity of the other separated by a long chain. The processing of the kinetic data makes it possible to determine the reaction-rate constants for macromolecules of different functionalities and to quantitatively describe the process behavior. 相似文献
7.
8.
V. A. Gorshkov A. G. Tarasov V. I. Yukhvid 《Russian Journal of Physical Chemistry B, Focus on Physics》2010,4(2):304-307
Aluminum oxynitrides Al22O30N2 and Al23O27N5 and a number of Al-O-N solid solutions with a nitrogen content of 2.3 to 6.5 wt % were prepared from (CrO3-Al-Al2O3-AlN) thermite-type mixtures with a high combustion temperature (2950–3200 K) by using the autowave synthesis method. The
synthesis was conducted in a hermetically sealed reactor at an initial nitrogen pressure of 4.0 to 8.0 MPa. The aluminum nitride
content was demonstrated to influence the nitrogen content in cast aluminum oxynitrides and on their microstructure and phase
composition. 相似文献
9.
Journal of Analytical Chemistry - We validated a procedure for the determination of indicator congeners (ICs) of polychlorinated biphenyls (PCBs) (IUPAC nos. 28, 52, 101, 118, 138, 153, and 180) in... 相似文献
10.
Ter-Akopian G. M. Oganessian Yu. Ts. Bezbakh A. A. Fomichev A. S. Golovkov M. S. Gorshkov A. V. Krupko S. A. Nikolskii E. Yu. Sidorchuk S. I. Stepantsov S. V. Wolski R. 《Physics of Atomic Nuclei》2020,83(4):497-502
Physics of Atomic Nuclei - Quasi-elastic, multi-nucleon transfer reactions induced by the radioactive-ion beams with energy 4–6 MeV/u allow one to produce moderately excited neutron-rich... 相似文献