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    Vinogradova, I. S.
    Formation of the vascular system of developing bean (Phaseolus limensis L.) seeds according to nuclear magnetic resonance microtomography / I. S. Vinogradova, O. V. Falaleev // Russ. J. Dev. Biol. - 2012. - Vol. 43, Is. 1. - P. 25-34, DOI 10.1134/S1062360412010079. - Cited References: 57. - The work was supported by the targeted program "Development of the Research Potential of Higher School" (project no. 2.1.1/2584). . - ISSN 1062-3604
Рубрики:
NMR MICROSCOPY
   WATER-UPTAKE
   COWPEA FRUIT
   PLANTS
   PHLOEM
   TRANSPORT
   FLOW
   ARCHITECTURE
   GRAINS
   IMAGE
Кл.слова (ненормированные):
H-1 magnetic resonance microtomography -- lima bean (Phaseolus limensis) seeds -- seed development and ripening -- vascular bundles -- transport of assimilates
Аннотация: H-1 magnetic resonance microtomography imaging was applied to study vascular systems in developing bean (Phaseolus limensis L.) seeds. Using the gradient echo method, we recorded 2D tomographic sections in the sagittal and axial planes of the fruits sampled from a vegetating plant on days 10, 17, 24, and 31 after fertilization. Any vascular connection between the tissues of maternal plant (bean pod and seed coat) and the embryo were undetectable. The embryo has an autonomous branched network of procambial strands in the cotyledons, converging to the embryonic axis. The bean pods are covered with a network of vascular bundles; large vascular strands run along the dorsal and ventral sutures. The seed coat vascular bundles are formed in the process of seed ripening and are represented by a developed vascular system multiply branching in the middle part of the ground parenchyma at the stage of physiological maturity. They are connected with the source of assimilates via the lateral pod veins and a large vascular bundle, entering the seed below the hilum via the placenta. Assimilates enter the external part of the seed coat, which contains no vascular bundles, via the funiculus vascular bundles and hilum tissue.

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Публикация на русском языке

Держатели документа:
[Vinogradova, I. S.] Siberian State Technol Univ, Krasnoyarsk 660049, Russia
[Falaleev, O. V.] Russian Acad Sci, Siberian Branch, Krasnoyarsk Sci Ctr, Kirenskii Inst Phys, Akademgorodok 660036, Russia

Доп.точки доступа:
Falaleev, O. V.; Фалалеев, Олег Владимирович; Виноградова, Ирина Семеновна
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Influence of a density increase on the evolution of the Kelvin-Helmholtz instability and vortices / U. V. Amerstorfer [et al.] // Phys. Plasmas. - 2010. - Vol. 17, Is. 7. - Ст. 72901, DOI 10.1063/1.3453705. - Cited References: 26. - This work was supported by the FWF under Project No. P21051-N16 and also by the RFBR under Grant No. 09-05-91000-ANF_a. . - ISSN 1070-664X

РУБ Physics, Fluids & Plasmas
Рубрики:
VENUS IONOPAUSE
   SIMULATION
   SCHEMES
   PLASMA
   FLOW
Кл.слова (ненормированные):
A-density -- Kelvin-Helmholtz instabilities -- Linear growth -- Loss rates -- Nonlinear numerical simulation -- Nonlinear phase -- Nonregular structures -- Plasma clouds -- Plasma layer -- Regular structure -- Spatial scale -- Turbulent phase -- Upper layer -- Boundary layers -- Helmholtz equation -- Ionosphere -- Plasma density -- Solar wind -- Magnetoplasma
Аннотация: Results of two-dimensional nonlinear numerical simulations of the magnetohydrodynamic Kelvin-Helmholtz instability are presented. A boundary layer of a certain width is assumed, which separates the plasma in the upper layer from the plasma in the lower layer. A special focus is given on the influence of a density increase toward the lower layer. The evolution of the Kelvin-Helmholtz instability can be divided into three different phases, namely, a linear growth phase at the beginning, followed by a nonlinear phase with regular structures of the vortices, and finally, a turbulent phase with nonregular structures. The spatial scales of the vortices are about five times the initial width of the boundary layer. The considered configuration is similar to the situation around unmagnetized planets, where the solar wind (upper plasma layer) streams past the ionosphere (lower plasma layer), and thus the plasma density increases toward the planet. The evolving vortices might detach around the terminator of the planet and eventually so-called plasma clouds might be formed, through which ionospheric material can be lost. For the special case of a Venus-like planet, loss rates are estimated, which are of the order of estimated loss rates from observations at Venus. (C) 2010 American Institute of Physics. [doi:10.1063/1.3453705]

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Держатели документа:
[Amerstorfer, U. V.
Biernat, H. K.] Austrian Acad Sci, Inst Space Res, A-8042 Graz, Austria
[Erkaev, N. V.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
[Erkaev, N. V.] Inst Computat Modelling, Krasnoyarsk 660036, Russia
[Taubenschuss, U.] Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USA
[Biernat, H. K.] Karl Franzens Univ Graz, Inst Phys, A-8010 Graz, Austria
ИВМ СО РАН
Space Research Institute, Austrian Academy of Sciences, 8042 Graz, Austria
Siberian Federal University, 660041 Krasnoyarsk, Russian Federation
Institute of Computational Modelling, 660036 Krasnoyarsk, Russian Federation
Department of Physics and Astronomy, University of Iowa, Iowa City, IA 52242-1479, United States
Institute of Physics, Karl-Franzens-University Graz, 8010 Graz, Austria

Доп.точки доступа:
Amerstorfer, U. V.; Erkaev, N. V.; Еркаев, Николай Васильевич; Taubenschuss, U.; Biernat, H. K.
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Jauho, A. P.
Simulations of interference effects in gated two-dimensional ballistic electron systems / A. P. Jauho, K. N. Pichugin, A. F. Sadreev // Phys. Rev. B. - 1999. - Vol. 60, Is. 11. - P. 8191-8198, DOI 10.1103/PhysRevB.60.8191. - Cited References: 26 . - ISSN 0163-1829

РУБ Physics, Condensed Matter
Рубрики:
CIRCULAR BENDS
   WAVE-GUIDES
   QUANTUM
   CONDUCTANCE
   FLOW
   GAS
Аннотация: We present detailed simulations addressing recent electronic interference experiments,where a metallic gate is used to locally modify the Fermi wavelength of the charge carriers. Our numerical calculations are based on a solution of the one-particle Schrodinger equation for a realistic model of the actual sample geometry, including a Poison equation-based determination of the potential due to the gate. The conductance is determined with the multiprobe Landauer-Buttiker formula, and in general we find conductance vs gate voltage characteristics, which closely resemble the experimental traces. A detailed examination based on quantum-mechanical streamlines suggests that the simple one-dimensional semiclassical model often used to describe the experiments has only a limited range of validity, and that certain ''unexpected" periodicities should not be assigned any particular significance, they arise due to the complicated multiple scattering processes occurring in certain sample geometries.

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Держатели документа:
Tech Univ Denmark, Mikroelekt Ctr, DK-2800 Lyngby, Denmark
LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Acad Sci Czech Republ, Inst Phys, CR-16200 Prague, Czech Republic
Abo Akad Univ, Dept Phys, SF-20500 Turku, Finland
ИФ СО РАН

Доп.точки доступа:
Pichugin, K. N.; Пичугин, Константин Николаевич; Sadreev, A. F.; Садреев, Алмаз Фаттахович
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Strength of topologically induced magnetic moments in a quantum device / P. . Exner [et al.] // Phys. Rev. Lett. - 1998. - Vol. 80, Is. 8. - P. 1710-1713, DOI 10.1103/PhysRevLett.80.1710. - Cited References: 13 . - ISSN 0031-9007

РУБ Physics, Multidisciplinary
Рубрики:
WAVE-GUIDES
STATES
FLOW
Аннотация: We consider resonant vortices around nodal points of the wave function describing electron transport through a mesoscopic der-ice. With a suitable choice of the device geometry. the dominating role is played of single vortices with a preferred orientation. To characterize the strength of the resulting magnetic moment, we have introduced a "magnetance," the quantity defined in analogy with the device conductance. Its basic properties and possible experimental detection are discussed. [S0031-9007(97)05255-1].

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Держатели документа:
Acad Sci Czech Republ, Inst Nucl Phys, CZ-25068 Rez, Czech Republic
Czech Tech Univ, Doppler Inst, Prague 11519, Czech Republic
Acad Sci Czech Republ, Inst Phys, CR-16200 Prague, Czech Republic
Russian Acad Sci, Inst Phys, Krasnoyarsk 660036, Russia
ИФ СО РАН

Доп.точки доступа:
Exner, P.; Seba, P.; Sadreev, A. F.; Садреев, Алмаз Фаттахович; Streda, P.; Feher, P.
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