79 research outputs found
Optical tweezers study of red blood cell aggregation and disaggregation in plasma and protein solutions
Kinetics of optical tweezers (OT)-induced spontaneous aggregation and disaggregation of red blood cells (RBCs) were studied at the level of cell doublets to assess RBC interaction mechanics. Measurements were performed under in vitro conditions in plasma and fibrinogen and fibrinogen + albumin solutions. The RBC spontaneous aggregation kinetics was found to exhibit different behavior depending on the cell environment. In contrast, the RBC disaggregation kinetics was similar in all solutions qualitatively and quantitatively, demonstrating a significant contribution of the studied proteins to the process. The impact of the study on assessing RBC interaction mechanics and the protein contribution to the reversible RBC aggregation process is discussed
Direct measurements of magnetic interaction-induced cross- correlations of two microparticles in Brownian motion OPEN
The effect of magnetic interactions on the Brownian motion of two magnetic microparticles is investigated. The cross-correlations of the thermal fluctuations of the two magnetic microbeads are directly measured using double-trap optical tweezers. It is experimentally demonstrated that the cross-correlation function is governed by the gradient of the magnetic force between the microparticles. The magnetic forces are measured with femtonewton precision, and the magnetic dipole moments of individual microparticles are determined within an accuracy on the order of fA-m 2 . Brownian motion is the driving force for a wide variety of biological, chemical and physical processes, such as the diffusion of organelles in living cells 1 , the dynamics of DNA supercoils In this paper, we describe the effect of magnetic forces between two individual magnetic microparticles on their Brownian motion, observed by utilizing double optical tweezers. Correlations in Brownian motion were measured as functions of the interparticle distance and the external magnetic field strength. It is shown that the coupling of the particles' motion and the cross-correlations of the fluctuations in particle position in optical traps depend on the gradient of the magnetic force rather than on the value of the interaction force itself. The magnetic moments of individual particles were obtained with an accuracy of several fA-m 2
London penetration depth in the tight binding approximation: Orthorhombic distortion and oxygen isotope effects in cuprates
We present a simple derivation of an expression for the superfluid density in superconductors with the tight binding energy
dispersion. The derived expression is discussed in detail because of its
distinction from the known expressions for ordinary superconductors with
parabolic energy dispersion. We apply this expression for the experimental data
analysis of the isotope effect in London penetration depth parameter in the BiSrCuO and YBaCuO family compounds near optimal doping, taking into
account the orthorhombic distortion of crystal structure, and estimate the
isotopic change of hopping parameters from the experimental data. We point out
that temperature behaviour is very sensitive to the ratio and estimate this quantity for a number of compounds.Comment: 10 pages, 4 figure
Modern Historiography of the First World War
Π ΡΠΊΠΎΠΏΠΈΡΡ ΠΏΠΎΡΡΡΠΏΠΈΠ»Π° Π² ΡΠ΅Π΄Π°ΠΊΡΠΈΡ 7 Π°Π²Π³ΡΡΡΠ° 2014 Π³.Π ΡΡΠ°ΡΡΠ΅ ΡΠ°ΡΡΠΌΠ°ΡΡΠΈΠ²Π°ΡΡΡΡ Π½ΠΎΠ²Π΅ΠΉΡΠΈΠ΅ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ ΠΏΠΎ ΠΈΡΡΠΎΡΠΈΠΈ ΠΠ΅ΡΠ²ΠΎΠΉ ΠΌΠΈΡΠΎΠ²ΠΎΠΉ Π²ΠΎΠΉΠ½Ρ, ΠΏΠΎΡΠ²ΠΈΠ²ΡΠΈΠ΅ΡΡ Π² ΡΠ²ΡΠ·ΠΈ ΡΠΎ 100-Π»Π΅ΡΠΈΠ΅ΠΌ ΡΠΎ Π΄Π½Ρ Π΅Π΅ Π½Π°ΡΠ°Π»Π°. ΠΡΠ½ΠΎΠ²Π½ΠΎΠ΅ Π²Π½ΠΈΠΌΠ°Π½ΠΈΠ΅ ΡΠ΄Π΅Π»ΡΠ΅ΡΡΡ Π°Π½Π°Π»ΠΈΠ·Ρ ΡΠΎΠ²ΡΠ΅ΠΌΠ΅Π½Π½ΠΎΠΉ Π·Π°ΡΡΠ±Π΅ΠΆΠ½ΠΎΠΉ ΠΈΡΡΠΎΡΠΈΠΎΠ³ΡΠ°ΡΠΈΠΈ, ΠΊΠΎΡΠΎΡΠ°Ρ ΡΡΠ°Π΄ΠΈΡΠΈΠΎΠ½Π½ΠΎ ΠΎΠ±ΡΠ°ΡΠ°Π΅ΡΡΡ ΠΊ ΠΏΡΠΎΠ±Π»Π΅ΠΌΠ΅ Π²ΠΈΠ½ΠΎΠ²Π½ΠΈΠΊΠΎΠ² ΡΠ°Π·Π²ΡΠ·ΡΠ²Π°Π½ΠΈΡ Π²ΠΎΠΉΠ½Ρ. ΠΠ° ΠΏΡΠΈΠΌΠ΅ΡΠ΅ Π΄Π²ΡΡ
ΠΊΡΡΠΏΠ½ΡΡ
ΠΌΠΎΠ½ΠΎΠ³ΡΠ°ΡΠΈΠΉ ΡΠ°ΡΠΊΡΡΠ²Π°ΡΡΡΡ ΠΎΡΠ½ΠΎΠ²Π½ΡΠ΅ ΡΠ΅Π½Π΄Π΅Π½ΡΠΈΠΈ ΡΠ°Π·Π²ΠΈΡΠΈΡ ΠΌΠΈΡΠΎΠ²ΠΎΠΉ ΠΈΡΡΠΎΡΠΈΠΎΠ³ΡΠ°ΡΠΈΠΈ ΠΠ΅ΡΠ²ΠΎΠΉ ΠΌΠΈΡΠΎΠ²ΠΎΠΉ Π²ΠΎΠΉΠ½Ρ.The article discusses the latest research on the history of the First World War in regard with its centenary. The author emphasizes that many works are devoted to the heroes of the war and, while focusing on analysis of the two major monographs, describes the main trends in world historiography of the First World War
Β«Where to search for roots of today's Italy?Β»
Π Π΅ΡΠ΅Π½Π·ΠΈΡ Π½Π° ΠΊΠ½ΠΈΠ³Ρ: ΠΡΠ°ΠΈΠ½Ρ Π. ΠΠ²ΡΠΎΠ±ΠΈΠΎΠ³ΡΠ°ΡΠΈΡ ΠΎΠ΄Π½ΠΎΠΉ ΡΠ΅ΡΠΏΡΠ±Π»ΠΈΠΊΠΈ. ΠΠΎΡΠ½ΠΈ ΡΠΎΠ²ΡΠ΅ΠΌΠ΅Π½Π½ΠΎΠΉ ΠΡΠ°Π»ΠΈΠΈ = Crainz G. Autobiografia di una repubblica. Le radici dell'Italia attuale. Roma : Donzelli, 2009.The review of the book: Crainz G. Autobiografia di una repubblica. Le radici dell'Italia attuale. Roma : Donzelli, 2009
Features of Italian Fascism (on Interviews Professor V. I. Mikhailenko)
Π ΠΆΡΡΠ½Π°Π»Π΅ Π½Π°ΡΠ΅ΠΉ ΡΠ΅ΡΠΈΠΈ β 1 Π·Π° 2013 Π³ΠΎΠ΄ Π² ΡΡΠ±ΡΠΈΠΊΠ΅ Β«Π€ΠΎΡΡΠΌΒ» Π±ΡΠ»ΠΎ ΠΎΠΏΡΠ±Π»ΠΈΠΊΠΎΠ²Π°Π½ΠΎ ΠΈΠ½ΡΠ΅ΡΠ²ΡΡ ΠΏΡΠΎΡΠ΅ΡΡΠΎΡΠ° Π. Π. ΠΠΈΡ
Π°ΠΉΠ»Π΅Π½ΠΊΠΎ Β«ΠΡΠ°Π»ΡΡΠ½ΡΠΊΠΈΠΉ ΡΠ°ΡΠΈΠ·ΠΌ 90 Π»Π΅Ρ ΡΠΏΡΡΡΡ: Π°ΠΊΡΡΠ°Π»ΡΠ½ΠΎΡΡΡ ΠΈΡΡΠΎΡΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ ΡΠ΅Π½ΠΎΠΌΠ΅Π½Π°Β». ΠΠ°ΡΠ΅ΡΠΈΠ°Π» Π²ΡΠ·Π²Π°Π» ΠΆΠΈΠ²ΠΎΠΉ ΠΈΠ½ΡΠ΅ΡΠ΅Ρ ΡΠΏΠ΅ΡΠΈΠ°Π»ΠΈΡΡΠΎΠ² Π½Π΅ ΡΠΎΠ»ΡΠΊΠΎ ΠΈΠ· Π ΠΎΡΡΠΈΠΈ, Π½ΠΎ ΠΈ ΠΈΠ· ΠΡΠ°Π»ΠΈΠΈ ΠΈ ΠΠ΅ΡΠΌΠ°Π½ΠΈΠΈ. Π ΡΡΠΎΠΌ Π²ΡΠΏΡΡΠΊΠ΅ ΠΌΡ ΠΏΡΠ΅Π΄Π»Π°Π³Π°Π΅ΠΌ Π²Π½ΠΈΠΌΠ°Π½ΠΈΡ ΡΠΈΡΠ°ΡΠ΅Π»Π΅ΠΉ ΠΎΡΠΊΠ»ΠΈΠΊΠΈ Π½Π° ΠΏΡΠ±Π»ΠΈΠΊΠ°ΡΠΈΡ, ΠΏΠΎΡΡΡΠΏΠΈΠ²ΡΠΈΠ΅ Π² ΡΠ΅Π΄Π°ΠΊΡΠΈΡ
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