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1.
S. N. Artemenko 《JETP Letters》2004,79(6):277-281
It is shown theoretically that the Luttinger liquid can exist in quasi-one-dimensional conductors in the presence of impurities in a form of a collection of bounded Luttinger liquids. The conclusion is based on the observation by Kane and Fisher that a local impurity potential in Luttinger liquid acts, at low energies, as an infinite barrier. This leads to a discrete spectrum of collective charge and spin density fluctuations, so that interchain hopping can be considered as a small parameter at temperatures below the minimum excitation energy of the collective modes. The results are compared with recent experimental observation of a Luttinger-liquid-like behavior in thin NbSe3 and TaS3 wires. 相似文献
2.
S. A. Andronati A. A. Krys’ko B. M. Chugunov T. A. Kabanova A. G. Artemenko 《Russian Journal of Organic Chemistry》2006,42(8):1174-1182
A new series of RGDF mimetics, derivatives of 4-(isoindolin-5-yl)amino-4-oxobutanoic acid, was synthesized. The compounds obtained inhibit efficiently the thrombocytes aggregation in experiments in vitro; their biological targets are fibrinogen receptors. The antiaggregatory activity and the affinity correlate with the hydrophobicity of the compounds. 相似文献
3.
Bychkova E. V. Rodzivilova I. S. Panova L. G. Artemenko S. E. 《Russian Journal of Applied Chemistry》2002,75(10):1591-1593
The adsorption isotherms of the product of transesterification of dimethyl methylphosphonate (ZG-2), used as fire retardant, from dilute solutions on viscose fiber were determined experimentally at various temperatures. The parameters of pore structure of the fibrous sorbent were estimated using the general equation of the theory of volume filling of micropores. 相似文献
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6.
N-terminal tagging strategy for De Novo sequencing of short peptides by ESI-MS/MS and MALDI-MS/MS 总被引:1,自引:0,他引:1
Tatiana Yu. Samgina Sergey V. Kovalev Vladimir A. Gorshkov Konstantin A. Artemenko Nikita B. Poljakov Albert T. Lebedev 《Journal of the American Society for Mass Spectrometry》2010,21(1):104-111
The major portion of skin secretory peptidome of the European Tree frog Hyla arborea consists of short peptides from tryptophyllin family. It is known that b-ions of these peptides undergo head-to-tail cyclization, forming a ring that can open, resulting in several linear forms.
As a result, the spectrum contains multiple ion series, thus complicating de novo sequencing. This was observed in the Q-TOF spectrum of one of the tryptophyllins isolated from Hyla arborea; the sequence FLPFFP-NH2 was established by Edman degradation and counter-synthesis. Though no rearrangements were observed in FTICR-MS and MALDI-TOF/TOF
spectra, both of them were not suitable for mass-spectrometry sequencing due to the low sequence coverage. To obtain full
amino acid sequence by mass spectrometry, three chemical modifications to N-terminal amino moiety were applied. They include
acetylation and sulfobenzoylation of N-amino group and its transformation to 2,4,6-trimethylpyridinium by interaction with
2,4,6-trimethylpyrillium tetrafluoroborate. All three reagents block scrambling and provide spectra better than the intact
peptide. Unfortunately, all of them also readily react with lysine side chain. Hence, all investigated procedures can be used
to improve sequencing of short peptides, while acetylation is the recommended one. It shows excellent results, and it is plain
and simple to perform. This is the procedure of choice for MS-sequencing of short peptides by manual or automatic algorithms. 相似文献
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The spin transport as the current flows through an impurity in a one-dimensional conductor is analyzed. The interacting electrons
are described in terms of the Luttinger liquid theory. Both the Coulomb and short-range interactions are considered; the latter
appears when the gate screens the long-range part of the Coulomb potential. The cases of magnetic and nonmagnetic impurities
are considered. It has been revealed that, for a magnetic impurity, the electric current flow induces the generation of the
spin current, which has direct and alternating components. At low temperatures and voltages, the current can be completely
spin-polarized. For a nonmagnetic impurity, the spin current generation is absent. The spin current flowing though the wire
affects the current-voltage characteristic for both magnetic and nonmagnetic impurities. The results have been obtained for
a rather strong electron-electron interaction. 相似文献
9.
A lattice model of the spatial structure of a molecule is suggested. A broken line is constructed to characterize atoms and
molecular fragments. The line is a spiral (left or right) embracing the whole lattice containing the molecule. The mutual
arrangement of molecular fragments along the broken line is described by a molecular code. The code contains all the necessary
information about molecular conformation and configuration in compressed form. Comparing the codes makes it possible to evaluate
the structural similarity and dissimilarity of molecules. For example, one can easily estimate the chirality level for enantiomers.
Using this approach is demonstrated on various model structures.
A. V. Bogatskii Physicochemical Institute, Ukrainian Academy of Sciences. Odessa State University. Translated fromZhurnal Strukturnoi Khimii, Vol. 39, No. 3, pp. 541–546, May–June, 1998.
This work was supported by INTAS grant INTAS-UA 95-0060. 相似文献
10.
Vakhitov R. R. Artemenko S. N. Remizov S. V. 《Journal of Experimental and Theoretical Physics》2010,111(2):304-308
The low-temperature heat capacity of a quasi-one-dimensional conductor in the Luttinger liquid state is studied for conductors with a charge density wave and without it. It is shown that pinning of the Luttinger liquid leads to localization of spins and a strong effect of the magnetic field on the thermodynamics of samples resembling the effect observed in recent experiments. We believe that this indicates the possibility of the formation of a Luttinger liquid in quasi-one-dimensional crystals.
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