1,069 research outputs found
Controlling the quantum number distribution and yield of Rydberg states via the duration of the laser pulse
We show that the distribution of quantum numbers of Rydberg states does not
only depend on the field strength and wavelength of the laser which the atom is
exposed to, but that it also changes significantly with the duration of the
laser pulse. We provide an intuitive explanation for the underlying mechanism
and derive a scaling law for the position of the peak in the quantum number
distribution on the pulse duration. The new analytic description for the
electron's movement in the superposed laser and Coulomb field (applied in the
study of quantum numbers) is then used to explain the decrease of the Rydberg
yield with longer pulse durations. This description stands in contrast to the
concepts that explained the decrease so far and also reveals that
approximations which neglect Coulomb effects during propagation are not
sufficient in cases such as this.Comment: 8 pages, 8 figure
Oxygen, nitrogen and sulphide fluxes in the Black Sea
The fluxes and production/consumption rates of oxygen, nitrate, ammonium and sulphide are estimated in the paper utilising results of the 1.5-dimensional stationary model of vertical exchange in the Black Sea (Samodurov & Ivanov, 1998). The profiles of the vertical flux and rate of production/consumption of these substances have revealed a number of intriguing features in the biogeochemical nature of the Black Sea. An approximate redox balance of the counter-fluxes of nitrate and ammonium into the sub-oxic zone has been revealed confirming that intensive denitrification may be the primary loss of nitrogen in the Black Sea. A low ratio of the nitrate stock to the flux of nitrate from the oxycline confirms the possibility of prominent changes in the distribution of nitrate on the time scale of a year. The ratio of the nitrate to oxygen vertical flux has revealed a lack of nitrate in the oxycline above the nitrate maximum. The lateral (related to the "Bosporus plume") flux of oxygen in the layer of the main pycnocline appears to be very important for the existing biogeochemical structure of the Black sea water column being the reason of sulphide consumption inside the anoxic zone and changes in the ammonium-sulphide stoichiometry of the anoxic zone, the primary reason of the existence of the sub-oxic layer and the basic reason of relative stability of the sulphide onset
N=4 supersymmetric Eguchi-Hanson sigma model in d=1
We show that it is possible to construct a supersymmetric mechanics with four
supercharges possessing not conformally flat target space. A general idea of
constructing such models is presented. A particular case with Eguchi--Hanson
target space is investigated in details: we present the standard and quotient
approaches to get the Eguchi--Hanson model, demonstrate their equivalence, give
a full set of nonlinear constraints, study their properties and give an
explicit expression for the target space metric.Comment: LaTeX, 9 page
Ventilation of the Black Sea pycnocline on seasonal and interannual time scales
The paper is a description of temporal variability of winter cooling conditions and estimation of effective cross-isopycnal mixing rates in the Black Sea. Data averaging versus salinity / sigma-t scale was used to filter effects of local dynamics. It is shown that traces of winter mixing events appear well preserved in the temperature-salinity structure, due to the peculiarities of the Black Sea where temperature often acts as a passive tracer with a smaller contribution to density as compared to salinity. Vertical distribution of the magnitudes of temperature oscillations indicates that the convection events have limited effects in modifying the structure of the middle and lower pycnocline on a seasonal time scale. However, long-term fluctuations are well recognised. The magnitudes of the seasonal and long-term temperature fluctuations are comparable only in the upper pycnocline. Three major cooling events can be distinguished from the record of the pycnocline temperature for the past 75 years. The intensive cooling occurred in the late 1920s - early 1930s, early 1950s and late 1980s - early 1990s. Partial renewal of the water of the cold intermediate layer core took place approximately once in two years. The period when convection causes erosion of the pycnocline lasts for only a week. It is shown that a lateral source of heat and salt exists for the upper pycnocline, where it is the cold intermediate water, and for the lower pycnocline, the layer below S@ 20.5, where this lateral source of salt and heat is maintained by disintegrating Bosphorus plume
Modeling of Plasma Dynamics and EUV Generation for Distributed Sn Targets Irradiated with Short Laser Pulses
Experimental Study of Coherent Summation of Radiation from Two Widely Aperture Pulsed
Emission of two high-power pulsed CO2-lasers with a transverse discharge at atmospheric pressure in
the active medium and the output beam aperture 100Ρ
100 mm, united by a joint unstable telescopic reso-nator, was coherently summarized under conditions of real ground-level trackon the screen surface, which
was remote from output mirror of the laser at a distance of 263 m. Output Brewster windows of laser cu-vettes were manufactured from single-crystal plates of sodium chloride which had a diameter of 300 mm.
Mirrors for resonator and optical circuit were manufactured from oxygen-free copper. Active medium - a
mixture of gases: CO2: N2: He in the ratio 1 : 2 : 3. Laser pulse duration is 5 microseconds. During the ex-periment, when summing on the screen 2-laser beams at the lowest possible convergence angle of rays, the
interference pattern was registered.
When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/3610
Phonon squeezing via correlations in the superconducting electron-phonon interaction
Superconductivity in the conventional BCS model with correlated squeezed phonons is discussed. It is shown that the energy gap and the critical temperature are maximally enhanced in an optimum and finite range of squeezed coupling. For finite-squeezed coupling the ratio 2Ξ/Tc becomes coupling-constant dependent and increases beyond the BCS value of 3.53. Ion-mass dependence of the squeezed coupling constant can yield variations of the isotope exponent from its conventional BCS value of 0.5. Β© 1995 The American Physical Society
Phonon squeezing in superconducting borocarbides
The recently discovered superconductor LuNi2B2C is investigated in the context of strong electron-electron correlations modulated by a squeezed phonon mode propagating in the perpendicular direction to the layers with longitudinal polarization. The squeezed phonons arise in the anharmonic lattice expansion since the linear electron-phonon interaction vanishes due to the structure of the NiB4 tetrahedra. The observed weak isotope effect and small dependence of Tc on pressure is qualitatively understood within the framework of this model. Β© 1994
ΠΠΎΠ½ΡΡΠΎΠ»Ρ ΠΊΠ°ΡΠ΅ΡΡΠ²Π° ΠΌΠ΅ΡΠ΅Π½ΡΡ FITC Π±Π΅Π»ΠΊΠΎΠ² Π΄Π»Ρ ΠΈΠ½ΡΠ΅ΡΠ°ΠΊΡΠΎΠΌΠ½ΡΡ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠΉ ΠΌΠ΅ΡΠΎΠ΄Π°ΠΌΠΈ ΠΊΠ°ΠΏΠΈΠ»Π»ΡΡΠ½ΠΎΠ³ΠΎ SDS Π³Π΅Π»Ρ-ΡΠ»Π΅ΠΊΡΡΠΎΡΠΎΡΠ΅Π·Π° ΠΈ SPR Π±ΠΈΠΎΡΠ΅Π½ΡΠΎΡΠΎΠΌ
The technology of dye-labeled proteins has many fields of application, especially in interactomics. The aim of this work was to adapt protocol of conjugation of low molecular weight (12 β 15 kDΠ°) heme-containing proteins with fluorescein isothiocyanate, isomer I, (FITC) for subsequent protein-protein interaction studies. We have monitored the quality of FITC-labeling of the target protein and comparative assessment of its binding capacity. Using the cytochrome C (Mw 12 kDΠ°) as an example, it has been shown that using the three step method approach including conventional spectrophotometry, capillary gel electrophoresis and SPR analysis it is possible to assess: (i) the capability of the FITC-labeled target protein to interact with its protein partner and protein material from tissue lysates, (ii) the fact of dye conjugation with the protein, and (iii) the quality of purification for final protein preparation from unreacted free dye moleculesΠ’Π΅Ρ
Π½ΠΎΠ»ΠΎΠ³ΠΈΡ ΠΌΠ΅ΡΠ΅Π½ΡΡ
ΠΊΡΠ°ΡΠΈΡΠ΅Π»Π΅ΠΌ Π±Π΅Π»ΠΊΠΎΠ² ΠΈΠΌΠ΅Π΅Ρ ΠΎΡΠ΅Π½Ρ ΠΌΠ½ΠΎΠ³ΠΎ ΠΎΠ±Π»Π°ΡΡΠ΅ΠΉ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ΠΈΡ, Π² ΡΠΎΠΌ ΡΠΈΡΠ»Π΅ ΠΈ Π΄Π»Ρ ΠΈΠ½ΡΠ΅ΡΠ°ΠΊΡΠΎΠΌΠ½ΡΡ
ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠΉ. Π¦Π΅Π»ΡΡ Π΄Π°Π½Π½ΠΎΠΉ ΡΠ°Π±ΠΎΡΡ Π±ΡΠ»Π° ΠΎΡΠ΅Π½ΠΊΠ° ΠΏΡΠΈΠΌΠ΅Π½ΠΈΠΌΠΎΡΡΠΈ ΠΏΡΠΎΡΠΎΠΊΠΎΠ»Π° ΠΌΠ΅ΡΠ΅Π½ΠΈΡ Π±Π΅Π»ΠΊΠΎΠ² ΡΠ»ΡΠΎΡΠ΅ΡΡΠ΅ΠΈΠ½ ΠΈΠ·ΠΎΡΠΈΠΎΡΠΈΠΎΠ½Π°ΡΠΎΠΌ (ΠΈΠ·ΠΎΠΌΠ΅Ρ I, (FITC)) Π΄Π»Ρ Π±Π΅Π»ΠΊΠΎΠ² Ρ Π½Π΅Π±ΠΎΠ»ΡΡΠΎΠΉ ΠΌΠΎΠ»Π΅ΠΊΡΠ»ΡΡΠ½ΠΎΠΉ ΠΌΠ°ΡΡΠΎΠΉ (12 β15 ΠΊΠΠ°) ΠΏΡΡΠ΅ΠΌ ΠΈΡ
ΠΊΠΎΠ²Π°Π»Π΅Π½ΡΠ½ΠΎΠΉ ΠΊΠΎΠ½ΡΡΠ³Π°ΡΠΈΠΈ Ρ FITC, Π° ΡΠ°ΠΊΠΆΠ΅ ΠΊΠΎΠ½ΡΡΠΎΠ»Ρ ΠΊΠ°ΡΠ΅ΡΡΠ²Π° Π²ΠΊΠ»ΡΡΠ΅Π½ΠΈΡ ΠΌΠ΅ΡΠΊΠΈ Π² Π±Π΅Π»ΠΎΠΊ ΠΈ ΡΡΠ°Π²Π½ΠΈΡΠ΅Π»ΡΠ½Π°Ρ ΠΎΡΠ΅Π½ΠΊΠ° Π΅Π³ΠΎ ΡΠΏΠΎΡΠΎΠ±Π½ΠΎΡΡΠΈ ΠΊ Π±Π΅Π»ΠΎΠΊ-Π±Π΅Π»ΠΊΠΎΠ²ΡΠΌ Π²Π·Π°ΠΈΠΌΠΎΠ΄Π΅ΠΉΡΡΠ²ΠΈΡΠΌ. ΠΠ° ΠΏΡΠΈΠΌΠ΅ΡΠ΅ ΡΠΈΡΠΎΡ
ΡΠΎΠΌΠ° Ρ (12 ΠΊΠΠ°) Π±ΡΠ»ΠΎ ΠΏΠΎΠΊΠ°Π·Π°Π½ΠΎ, ΡΡΠΎ ΠΊΠΎΠΌΠ±ΠΈΠ½ΠΈΡΠΎΠ²Π°Π½Π½ΠΎΠ΅ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ΠΈΠ΅ ΠΌΠ΅ΡΠΎΠ΄ΠΎΠ² ΡΡΠ°Π΄ΠΈΡΠΈΠΎΠ½Π½ΠΎΠΉ ΡΠΏΠ΅ΠΊΡΡΠΎΡΠΎΡΠΎΠΌΠ΅ΡΡΠΈΠΈ, ΠΊΠ°ΠΏΠΈΠ»Π»ΡΡΠ½ΠΎΠ³ΠΎ Π³Π΅Π»Ρ-ΡΠ»Π΅ΠΊΡΡΠΎΡΠΎΡΠ΅Π·Π° ΠΈ SPR-Π°Π½Π°Π»ΠΈΠ·Π° ΠΏΠΎΠ·Π²ΠΎΠ»ΡΠ΅Ρ ΡΠ΄Π΅Π»Π°ΡΡ Π²ΡΠ²ΠΎΠ΄Ρ ΠΎ: Π°) ΡΠΎΡ
ΡΠ°Π½Π΅Π½ΠΈΠΈ ΡΠΏΠΎΡΠΎΠ±Π½ΠΎΡΡΠΈ ΠΌΠ΅ΡΠ΅Π½ΠΎΠ³ΠΎ ΡΠ΅Π»Π΅Π²ΠΎΠ³ΠΎ Π±Π΅Π»ΠΊΠ° Π²Π·Π°ΠΈΠΌΠΎΠ΄Π΅ΠΉΡΡΠ²ΠΎΠ²Π°ΡΡ Ρ Π±Π΅Π»ΠΊΠ°ΠΌΠΈ-ΠΏΠ°ΡΡΠ½ΡΡΠ°ΠΌΠΈ ΠΈ Π±Π΅Π»ΠΊΠΎΠ²ΡΠΌ ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»ΠΎΠΌ ΡΠΊΠ°Π½Π΅Π²ΡΡ
Π»ΠΈΠ·Π°ΡΠΎΠ²; Π±) ΡΠ°ΠΊΡΠ΅ Π²ΠΊΠ»ΡΡΠ΅Π½ΠΈΡ ΠΌΠ΅ΡΠΊΠΈ Π² Π±Π΅Π»ΠΎΠΊ; Π²) ΠΊΠ°ΡΠ΅ΡΡΠ²Π΅ ΠΎΡΠΈΡΡΠΊΠΈ ΡΠΈΠ½Π°Π»ΡΠ½ΠΎΠ³ΠΎ Π±Π΅Π»ΠΊΠΎΠ²ΠΎΠ³ΠΎ ΠΏΡΠ΅ΠΏΠ°ΡΠ°ΡΠ° ΠΎΡ Π½Π΅ ΠΏΡΠΎΡΠ΅Π°Π³ΠΈΡΠΎΠ²Π°Π²ΡΠΈΡ
Ρ Π½ΠΈΠΌ ΡΠ²ΠΎΠ±ΠΎΠ΄Π½ΡΡ
ΠΌΠΎΠ»Π΅ΠΊΡΠ» ΠΊΡΠ°ΡΠΈΡΠ΅Π»Ρ
Π£ΡΠΈΠ»Π΅Π½ΠΈΠ΅ ΡΠΈΠ³Π½Π°Π»Π° SPR Π±ΠΈΠΎΡΠ΅Π½ΡΠΎΡΠ° Ρ ΠΏΠΎΠΌΠΎΡΡΡ Π·ΠΎΠ»ΠΎΡΡΡ Π½Π°Π½ΠΎΡΠ°ΡΡΠΈΡ Π½Π° ΠΏΡΠΈΠΌΠ΅ΡΠ΅ Π°Π½Π°Π»ΠΈΠ·Π° Π±Π΅ΡΠ°-2-ΠΌΠΈΠΊΡΠΎΠ³Π»ΠΎΠ±ΡΠ»ΠΈΠ½Π° ΡΠ΅Π»ΠΎΠ²Π΅ΠΊΠ°
The highly sensitive method of surface plasmon resonance (SPR) detection of low concentrations of target proteins based on the biosensor signal enhancement by using gold nanoparticles (similar to βsandwichβ assay type) is described. The commercial protein preparations of beta-2-microglobulin (B2M) as a model biomarker and polyclonal (Pab) and monoclonal antibodies (Mab) to B2M were used. It has been shown that this universal and reproducible method can be applied for SPR analysis of other protein biomarkers by analogy with the biomarker protein B2M. The present work is also focused on the experimental protocol description. The protocols of gold nanoparticles (GNP) synthesis, obtaining the conjugates of Pab/GNP and measuring their concentration, the protocol of Mab covalent immobilization on the optical chip CM5 of a biosensor and also SPR registration of molecular interactions Mab-biomarker and in the βsandwichβ assay type Mab-biomarker-Pab or Mab-biomarker-Pab/GNP are considered in detail.ΠΠΏΠΈΡΠ°Π½ Π²ΡΡΠΎΠΊΠΎΡΡΠ²ΡΡΠ²ΠΈΡΠ΅Π»ΡΠ½ΡΠΉ ΠΌΠ΅ΡΠΎΠ΄ Π΄Π΅ΡΠ΅ΠΊΡΠΈΠΈ Π½ΠΈΠ·ΠΊΠΈΡ
ΠΊΠΎΠ½ΡΠ΅Π½ΡΡΠ°ΡΠΈΠΉ ΡΠ΅Π»Π΅Π²ΡΡ
Π±Π΅Π»ΠΊΠΎΠ² Ρ ΠΏΠΎΠΌΠΎΡΡΡ ΡΡΠΈΠ»Π΅Π½ΠΈΡ ΡΠΈΠ³Π½Π°Π»Π° ΠΎΠΏΡΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ Π±ΠΈΠΎΡΠ΅Π½ΡΠΎΡΠ° Π½Π° ΠΎΡΠ½ΠΎΠ²Π΅ ΠΏΠΎΠ²Π΅ΡΡ
Π½ΠΎΡΡΠ½ΠΎΠ³ΠΎ ΠΏΠ»Π°Π·ΠΌΠΎΠ½Π½ΠΎΠ³ΠΎ ΡΠ΅Π·ΠΎΠ½Π°Π½ΡΠ° (SPR) Ρ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ΠΈΠ΅ΠΌ Π·ΠΎΠ»ΠΎΡΡΡ
Π½Π°Π½ΠΎΡΠ°ΡΡΠΈΡ (ΠΏΠΎ ΡΠΈΠΏΡ βΡΠ°Π½Π΄Π²ΠΈΡβ). Π ΠΊΠ°ΡΠ΅ΡΡΠ²Π΅ ΠΌΠΎΠ΄Π΅Π»ΠΈ Π±ΠΈΠΎΠΌΠ°ΡΠΊΠ΅ΡΠ° ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ ΠΊΠΎΠΌΠΌΠ΅ΡΡΠ΅ΡΠΊΠΈΠΉ Π±Π΅Π»ΠΊΠΎΠ²ΡΠΉ ΠΏΡΠ΅ΠΏΠ°ΡΠ°Ρ Π±Π΅ΡΠ°-2-ΠΌΠΈΠΊΡΠΎΠ³Π»ΠΎΠ±ΡΠ»ΠΈΠ½Π° (B2M), Π° ΡΠ°ΠΊΠΆΠ΅ ΠΏΡΠ΅ΠΏΠ°ΡΠ°ΡΡ ΠΏΠΎΠ»ΠΈΠΊΠ»ΠΎΠ½Π°Π»ΡΠ½ΡΡ
(Pab) ΠΈ ΠΌΠΎΠ½ΠΎΠΊΠ»ΠΎΠ½Π°Π»ΡΠ½ΡΡ
Π°Π½ΡΠΈΡΠ΅Π» (Mab) ΠΊ B2M. ΠΠ°Π½Π½ΡΠΉ ΠΌΠ΅ΡΠΎΠ΄ Π°Π½Π°Π»ΠΈΠ·Π° Π²ΡΠ»Π΅Π΄ΡΡΠ²ΠΈΠ΅ Π΅Π³ΠΎ ΡΠ½ΠΈΠ²Π΅ΡΡΠ°Π»ΡΠ½ΠΎΡΡΠΈ ΠΈ Π²ΠΎΡΠΏΡΠΎΠΈΠ·Π²ΠΎΠ΄ΠΈΠΌΠΎΡΡΠΈ ΠΌΠΎΠΆΠ΅Ρ Π±ΡΡΡ ΠΏΡΠΈΠΌΠ΅Π½ΡΠ½ Π΄Π»Ρ Π°Π½Π°Π»ΠΈΠ·Π° Π»ΡΠ±ΡΡ
Π±Π΅Π»ΠΊΠΎΠ²ΡΡ
Π±ΠΈΠΎΠΌΠ°ΡΠΊΠ΅ΡΠΎΠ². ΠΠΎΠ΄ΡΠΎΠ±Π½ΠΎ ΡΠ°ΡΡΠΌΠΎΡΡΠ΅Π½Ρ ΡΠΊΡΠΏΠ΅ΡΠΈΠΌΠ΅Π½ΡΠ°Π»ΡΠ½ΡΠ΅ ΠΏΡΠΎΡΠΎΠΊΠΎΠ»Ρ ΡΠΈΠ½ΡΠ΅Π·Π° Π·ΠΎΠ»ΠΎΡΡΡ
Π½Π°Π½ΠΎΡΠ°ΡΡΠΈΡ (GNP), ΠΏΠΎΠ»ΡΡΠ΅Π½ΠΈΡ ΠΈΡ
ΠΊΠΎΠ½ΡΡΠ³Π°ΡΠΎΠ² Ρ ΠΏΠΎΠ»ΠΈΠΊΠ»ΠΎΠ½Π°Π»ΡΠ½ΡΠΌΠΈ Π°Π½ΡΠΈΡΠ΅Π»Π°ΠΌΠΈ (Pab/GNP), ΡΠΏΠ΅ΠΊΡΡΠΎΡΠΎΡΠΎΠΌΠ΅ΡΡΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ ΠΎΠΏΡΠ΅Π΄Π΅Π»Π΅Π½ΠΈΡ ΠΊΠΎΠ½ΡΠ΅Π½ΡΡΠ°ΡΠΈΠΈ Π½Π°Π½ΠΎΡΠ°ΡΡΠΈΡ ΠΈ ΠΊΠΎΠ½ΡΡΠ³Π°ΡΠΎΠ², ΠΊΠΎΠ²Π°Π»Π΅Π½ΡΠ½ΠΎΠΉ ΠΈΠΌΠΌΠΎΠ±ΠΈΠ»ΠΈΠ·Π°ΡΠΈΠΈ Mab Π½Π° ΠΏΠΎΠ²Π΅ΡΡ
Π½ΠΎΡΡΠΈ ΠΎΠΏΡΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ ΡΠΈΠΏΠ° Π‘Π5 Π±ΠΈΠΎΡΠ΅Π½ΡΠΎΡΠ°, ΡΠ΅Π³ΠΈΡΡΡΠ°ΡΠΈΠΈ Π²Π·Π°ΠΈΠΌΠΎΠ΄Π΅ΠΉΡΡΠ²ΠΈΠΉ Mab-Π±ΠΈΠΎΠΌΠ°ΡΠΊΠ΅Ρ ΠΈ ΡΠΎΡΠΌΠΈΡΠΎΠ²Π°Π½ΠΈΡ ΡΠΈΠΏΠ° βΡΠ°Π½Π΄Π²ΠΈΡβ Mab-Π±ΠΈΠΎΠΌΠ°ΡΠΊΠ΅Ρ-Pab ΠΈ Mab-Π±ΠΈΠΎΠΌΠ°ΡΠΊΠ΅Ρ-Pab/GNP
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