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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gorban A., Popova T., Zinovyev A.
Заглавие : Codon usage trajectories and 7-cluster structure of 143 complete bacterial genornic sequences
Разночтения заглавия :авие SCOPUS: Codon usage trajectories and 7-cluster structure of 143 complete bacterial genomic sequences
Место публикации : Physica A: ELSEVIER SCIENCE BV, 2005. - Vol. 353. - P365-387. - ISSN 0378-4371, DOI 10.1016/j.physa.2005.01.043
Примечания : Cited References: 46
Предметные рубрики: DNA-BASE COMPOSITION
ASYMMETRIC SUBSTITUTION PATTERNS
PROTEIN-CODING REGIONS
MICROBIAL GENOMES
GENE IDENTIFICATION
MARKOV-MODELS
G+C CONTENT
BIAS
PREDICTION
SELECTION
Ключевые слова (''Своб.индексиров.''): genome--cluster--codon usage--correlations--entropy--mean field--cluster--codon usage--correlations--entropy--genome--mean field--approximation theory--correlation methods--database systems--entropy--functions--genes--mathematical models--clusters--codon usage--genomes--mean field--bacteria
Аннотация: Three results are presented. First, we prove the existence of a universal 7-cluster structure in all 143 completely sequenced bacterial genomes available in Genbank in August 2004, and explained its properties. The 7-cluster structure is responsible for the main part of sequence heterogeneity in bacterial genomes. In this sense, our 7 clusters is the basic model of bacterial genome sequence. We demonstrated that there are four basic "pure" types of this model, observed in nature: "parallel triangles", "perpendicular triangles", degenerated case and the flower-like type. Second, we answered the question: how big are the position-specific information and the contribution connected with correlations between nucleotide. The accuracy of the mean-field (context-free) approximation is estimated for bacterial genomes. We show that codon us-age of bacterial genomes is a multi-linear function of their genomic G+C-content with high accuracy (more precisely, by two similar functions, one for eubacterial genomes and the other one for archaea). Description of these two codon-usage trajectories is the third result. All 143 cluster animated 3D-scatters are collected in a database and is made available on our web-site: http://www.ihes.fr/similar to zinovyev/7clusters. (c) 2005 Elsevier B.V. All rights reserved.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kim P. D., Yu S. C., Patrin G. S., Song Y. Y., Turpanov I. A., Khalyapin D. L., Marushchenko D. A.
Заглавие : Effect of the nonmagnetic layer in a Co/Cu/CoO trilayer structure on the exchange coupling in it
Место публикации : J. Exp. Theor. Phys.: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2011. - Vol. 112, Is. 4. - P612-616. - ISSN 1063-7761, DOI 10.1134/S1063776111030058
Примечания : Cited References: 21
Предметные рубрики: SPACER LAYER
BIAS
ANISOTROPY
Ключевые слова (''Своб.индексиров.''): cobalt layers--copper layer--exchange bias--interlayer exchange coupling--nonmagnetic layers--oscillation amplitude--temperature dependence--temperature range--trilayer film--trilayer structure--cobalt--crystal structure--epitaxial films--hysteresis--hysteresis loops--magnetic materials--exchange coupling
Аннотация: The dependence of the exchange bias of epitaxial single-crystal Co/Cu/CoO trilayer films on the copper layer thickness and temperature is studied. The exchange bias of the hysteresis loops of the ferromagnetic cobalt layer as a function of the copper layer thickness is found to have a well-pronounced oscillating character. The oscillations manifest themselves over the entire temperature range in which an exchange bias takes place (77-220 K). The complex variation of the oscillation amplitude with the nonmagnetic layer thickness can be explained by the superposition of two interlayer exchange coupling oscillation periods (lambda(1) a parts per thousand 10-11 , lambda(2) a parts per thousand 20 ) having differentamplitudes and temperature dependences.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Song Y. Y., Kim D. H., Yu S. C., Kim P. D., Turpanov I. A., Lee L. A., Buzmakov A. E., Lee K. W.
Заглавие : Observation of nonmonotonic oscillatory interlayer exchange coupling in Co/Cu/CoO films with varying Cu spacer thickness
Разночтения заглавия :авие SCOPUS: Observation of nonmonotonic oscillatory interlayer exchange coupling in CoCuCoO films with varying Cu spacer thickness
Место публикации : J. Appl. Phys.: AMER INST PHYSICS, 2008. - Vol. 103: 52nd Annual Conference on Magnetism and Magnetic Materials (NOV 05-09, 2007, Tampa, FL), Is. 7. - Ст.07C112. - ISSN 0021-8979, DOI 10.1063/1.2831390
Примечания : Cited References: 20
Предметные рубрики: GIANT MAGNETORESISTANCE
MAGNETIC-ANISOTROPY
LAYERS
BIAS
SUPERLATTICES
MULTILAYERS
TRILAYERS
Ключевые слова (''Своб.индексиров.''): copper--film thickness--thermal effects--cocucoo films--oscillatory interlayer exchange coupling.--metallic films
Аннотация: We report our experimental observation of interlayer exchange coupling phenomena in CoO/Cu/Co trilayers with systematic variation of Cu spacer layer thickness as well as temperature. It has been found that there exists a clear indication of nonmonotonically varying oscillatory interlayer exchange coupling. The amplitude of oscillation increases, reaches to the maximum, and decreases with increasing Cu spacer thickness from 1 to 16 atomic layers for all temperature ranges between 70 and 200 K. (c) 2008 American Institute of Physics.
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