101 research outputs found
Optical study of the polar BM CrB in low accretion state
This paper presents a spectral and photometric study of the poorly studied
polar BM CrB. Three states of the polar brightness and signs of transition from
one-pole to two-pole accretion mode were found by an analysis of ZTF data. It
is shown that the transition from the low state to the high state changes the
longitude of the main accretion spot (by ) and increases
its elongation (by ). The spectra contain Zeeman
absorptions of the H line which are formed at a magnetic field strength
of MG. These absorptions are likely produced by a cold halo
extending from the accretion spot at of the white dwarf
radius. Modeling of the behavior of the H emission line shows that the
main source of emission is the part of the accretion stream near the Lagrangian
point L, which is periodically eclipsed by the donor star. The spectra
exhibit a cyclotron component formed in the accretion spot. Its modeling by a
simple accretion spot model gives constraints on the magnetic field strength
MG and the temperature keV
Reactive magnetron plasma modification of electrospun PLLA scaffolds with incorporated chloramphenicol for controlled drug release
Surface modification with the plasma of the direct current reactive magnetron sputtering has demonstrated its efficacy as a tool for enhancing the biocompatibility of polymeric electrospun scaffolds. Improvement of the surface wettability of materials with water, as well as the formation of active chemical bonds in the near-surface layers, are the main reasons for the described effect. These surface effects are also known to increase the release rate of drugs incorporated in fibers. Herein, we investigated the effect of plasma modification on the chloramphenicol release from electrospun poly (lactic acid) fibrous scaffolds. Scaffolds with highβ50 wt./wt.%βdrug content were obtained. It was shown that plasma modification leads to an increase in the drug release rate and drug diffusion coefficient, while not deteriorating surface morphology and mechanical properties of scaffolds. The materialsβ antibacterial activity was observed to increase in the first day of the experiment, while remaining on the same level as the unmodified group during the next six days. The proposed technique for modifying the surface of scaffolds will be useful for obtaining drug delivery systems with controlled accelerated release, which can expand the possibilities of local applications of antibiotics and other drugs
ΠΠΈΠ²ΡΠ΅Π½Π½Ρ Π²ΠΏΠ»ΠΈΠ²Ρ ΠΊΠΎΠΌΠ±ΡΠ½ΠΎΠ²Π°Π½ΠΎΡ Π΄ΡΡ ΡΠΎΡΠΎΡΠ΅Π½ΡΠΈΠ±ΡΠ»ΡΠ·Π°ΡΠΎΡΠ° Ρ Π½ΠΈΠ·ΡΠΊΠΎΡΠ½ΡΠ΅Π½ΡΠΈΠ²Π½ΠΎΠ³ΠΎ Π»Π°Π·Π΅ΡΠ½ΠΎΠ³ΠΎ Π²ΠΈΠΏΡΠΎΠΌΡΠ½ΡΠ²Π°Π½Π½Ρ Π½Π° ΠΊΡΠ»ΡΠΊΡΡΠ½ΠΈΠΉ ΡΠΊΠ»Π°Π΄ ΠΌΡΠΊΡΠΎΡΠ»ΠΎΡΠΈ Π·ΡΠ±Π½ΠΎΠ³ΠΎ Π½Π°Π»ΡΠΎΡΡ
The effect of low-intensity laser radiation (LILR) on the background of a photosensitizer (ethacridine lactate) on selective elimination of pathogenic and conditionally pathogenic microorganisms has been studied. Taking into account antiseptic properties of ethacridine lactate the maximally possible time of influence of ethacridine lactate as a photosensitizer should be set. It has been found that after the influence of rivanol (ethacridine lactate) within 1.5-3 minutes the bactericidal action on microorganisms is observed. The effect of antiseptic in the interval from 30 to 60 seconds was not accompanied with the expressed quantitative change of the microbial population. The second stage of the research was identification of microorganisms sensitivity to various concentrations of the photosensitizer. As a photosensitizer the aqueous solution of ethacridine lactate in the concentrations of 0.1; 0.05; 0.01% was used. The results obtained allow to conclude that the concentration of 0.1% solution of ethacridine lactate increases the sensitivity of microorganisms to the effects of low-intensity laser radiation. During the experiment the combined impact of the antimicrobial activity of 0.1% solution of ethacridine lactate and blue spectrum laser radiation has been determined; it is manifested by decrease in the number of CFU/ml of the total microflora of the dental plaque. The number of CFU is reduced from 14.3 Β± 0.12 . 103/ml up to 2.4 Β± 0.3 . 102/ml after exposure (Table 1). Comparing the data of the control (the initial number of the colonies grown) and the experiment (the number of the colonies grown after the photoactivated disinfection) we have found that the antibacterial action of photoactivated disinfection depends directly on duration of exposure. Thus, the effectiveness of combined use of a photosensitizer with LILR is 1.2 times higher than that of ethacridine lactate (the exposure time is 60 seconds), and 2.0 times higher than the antimicrobial effect of the laser blue spectrum (the exposure time is 120 seconds).Π ΠΏΡΠΎΠ²Π΅Π΄Π΅Π½Π½ΠΎΠΌ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠΈ ΠΈΠ·ΡΡΠ°Π»ΠΈ Π²Π»ΠΈΡΠ½ΠΈΠ΅ ΠΠΠΠ Π½Π° ΡΠΎΠ½Π΅ ΡΠΎΡΠΎΡΠ΅Π½ΡΠΈΠ±ΠΈΠ»ΠΈΠ·Π°ΡΠΎΡΠ° (ΡΡΠ°ΠΊΡΠΈΠ΄ΠΈΠ½Π° Π»Π°ΠΊΡΠ°ΡΠ°) Π½Π° ΡΠ΅Π»Π΅ΠΊΡΠΈΠ²Π½ΡΡ ΡΠ»ΠΈΠΌΠΈΠ½Π°ΡΠΈΡ ΠΏΠ°ΡΠΎΠ³Π΅Π½Π½ΡΡ
ΠΈ ΡΡΠ»ΠΎΠ²Π½ΠΎ-ΠΏΠ°ΡΠΎΠ³Π΅Π½Π½ΡΡ
ΠΌΠΈΠΊΡΠΎΠΎΡΠ³Π°Π½ΠΈΠ·ΠΌΠΎΠ². Π£ΡΠΈΡΡΠ²Π°Ρ ΡΠΎ, ΡΡΠΎ ΡΡΠ°ΠΊΡΠΈΠ΄ΠΈΠ½Π° Π»Π°ΠΊΡΠ°ΡΡ ΠΏΡΠΈΡΡΡΠΈ ΡΠ²ΠΎΠΉΡΡΠ²Π° Π°Π½ΡΠΈΡΠ΅ΠΏΡΠΈΠΊΠ°, ΡΠ»Π΅Π΄ΠΎΠ²Π°Π»ΠΎ ΡΡΡΠ°Π½ΠΎΠ²ΠΈΡΡ ΠΌΠ°ΠΊΡΠΈΠΌΠ°Π»ΡΠ½ΠΎ Π²ΠΎΠ·ΠΌΠΎΠΆΠ½ΠΎΠ΅ Π²ΡΠ΅ΠΌΡ Π²ΠΎΠ·Π΄Π΅ΠΉΡΡΠ²ΠΈΡ ΡΡΠ°ΠΊΡΠΈΠ΄ΠΈΠ½Π° Π»Π°ΠΊΡΠ°ΡΠ° ΠΊΠ°ΠΊ ΡΠΎΡΠΎΡΠ΅Π½ΡΠΈΠ±ΠΈΠ»ΠΈΠ·Π°ΡΠΎΡΠ°. Π£ΡΡΠ°Π½ΠΎΠ²Π»Π΅Π½ΠΎ, ΡΡΠΎ ΠΏΠΎΡΠ»Π΅ Π²ΠΎΠ·Π΄Π΅ΠΉΡΡΠ²ΠΈΡ ΡΠΈΠ²Π°Π½ΠΎΠ»Π° (ΡΡΠ°ΠΊΡΠΈΠ΄ΠΈΠ½Π° Π»Π°ΠΊΡΠ°ΡΠ°) Π² ΡΠ΅ΡΠ΅Π½ΠΈΠ΅ 1,5-3-Ρ
ΠΌΠΈΠ½ΡΡ ΠΎΡΠΌΠ΅ΡΠ°Π»ΠΎΡΡ Π±Π°ΠΊΡΠ΅ΡΠΈΡΠΈΠ΄Π½ΠΎΠ΅ Π΄Π΅ΠΉΡΡΠ²ΠΈΠ΅ Π½Π° ΠΌΠΈΠΊΡΠΎΠΎΡΠ³Π°Π½ΠΈΠ·ΠΌΡ. ΠΠΎΠ·Π΄Π΅ΠΉΡΡΠ²ΠΈΠ΅ Π°Π½ΡΠΈΡΠ΅ΠΏΡΠΈΠΊΠ° Π² ΠΏΡΠΎΠΌΠ΅ΠΆΡΡΠΊΠ΅ ΠΎΡ 30 Π΄ΠΎ 60 Ρ Π½Π΅ ΡΠΎΠΏΡΠΎΠ²ΠΎΠΆΠ΄Π°Π»ΠΎΡΡ Π²ΡΡΠ°ΠΆΠ΅Π½Π½ΡΠΌ ΠΊΠΎΠ»ΠΈΡΠ΅ΡΡΠ²Π΅Π½Π½ΡΠΌ ΠΈΠ·ΠΌΠ΅Π½Π΅Π½ΠΈΠ΅ΠΌ ΠΌΠΈΠΊΡΠΎΠ±Π½ΠΎΠΉ ΠΏΠΎΠΏΡΠ»ΡΡΠΈΠΈ. ΠΡΠΎΡΡΠΌ ΡΡΠ°ΠΏΠΎΠΌ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ ΡΡΠ°Π»ΠΎ ΠΎΠΏΡΠ΅Π΄Π΅Π»Π΅Π½ΠΈΠ΅ ΡΡΠ²ΡΡΠ²ΠΈΡΠ΅Π»ΡΠ½ΠΎΡΡΠΈ ΠΌΠΈΠΊΡΠΎΠΎΡΠ³Π°Π½ΠΈΠ·ΠΌΠΎΠ² ΠΊ ΡΠ°Π·Π»ΠΈΡΠ½ΡΠΌ ΠΊΠΎΠ½ΡΠ΅Π½ΡΡΠ°ΡΠΈΡΠΌ ΡΠΎΡΠΎΡΠ΅Π½ΡΠΈΠ±ΠΈΠ»ΠΈΠ·Π°ΡΠΎΡΠ°. ΠΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π»ΠΈ Π²ΠΎΠ΄Π½ΡΠΉ ΡΠ°ΡΡΠ²ΠΎΡ ΡΡΠ°ΠΊΡΠΈΠ΄ΠΈΠ½Π° Π»Π°ΠΊΡΠ°ΡΠ° Ρ ΠΊΠΎΠ½ΡΠ΅Π½ΡΡΠ°ΡΠΈΡΠΌΠΈ 0,1; 0,05; 0,01%. ΠΠΎΠ»ΡΡΠ΅Π½Π½ΡΠ΅ ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΡ ΠΏΠΎΠ·Π²ΠΎΠ»ΡΡΡ ΡΠ΄Π΅Π»Π°ΡΡ Π²ΡΠ²ΠΎΠ΄, ΡΡΠΎ ΡΠ°ΡΡΠ²ΠΎΡ ΡΡΠ°ΠΊΡΠΈΠ΄ΠΈΠ½Π° Π»Π°ΠΊΡΠ°ΡΠ° Π² ΠΊΠΎΠ½ΡΠ΅Π½ΡΡΠ°ΡΠΈΠΈ 0,1% ΠΏΠΎΠ²ΡΡΠ°Π΅Ρ ΡΡΠ²ΡΡΠ²ΠΈΡΠ΅Π»ΡΠ½ΠΎΡΡΡ ΠΌΠΈΠΊΡΠΎΠΎΡΠ³Π°Π½ΠΈΠ·ΠΌΠΎΠ² ΠΊ Π΄Π΅ΠΉΡΡΠ²ΠΈΡ Π½ΠΈΠ·ΠΊΠΎΠΈΠ½ΡΠ΅Π½ΡΠΈΠ²Π½ΠΎΠ³ΠΎ Π»Π°Π·Π΅ΡΠ½ΠΎΠ³ΠΎ ΠΈΠ·Π»ΡΡΠ΅Π½ΠΈΡ. Π Ρ
ΠΎΠ΄Π΅ ΠΏΡΠΎΠ²Π΅Π΄Π΅Π½Π½ΠΎΠ³ΠΎ ΡΠΊΡΠΏΠ΅ΡΠΈΠΌΠ΅Π½ΡΠ° Π±ΡΠ»ΠΎ ΡΡΡΠ°Π½ΠΎΠ²Π»Π΅Π½ΠΎ Π°Π½ΡΠΈΠΌΠΈΠΊΡΠΎΠ±Π½ΠΎΠ΅ Π΄Π΅ΠΉΡΡΠ²ΠΈΠ΅ ΠΊΠΎΠΌΠ±ΠΈΠ½ΠΈΡΠΎΠ²Π°Π½Π½ΠΎΠ³ΠΎ Π²Π»ΠΈΡΠ½ΠΈΡ 0,1%-ΠΎΠ³ΠΎ ΡΠ°ΡΡΠ²ΠΎΡΠ° ΡΡΠ°ΠΊΡΠΈΠ΄ΠΈΠ½Π° Π»Π°ΠΊΡΠ°ΡΠ° ΠΈ Π»Π°Π·Π΅ΡΠ½ΠΎΠ³ΠΎ ΠΈΠ·Π»ΡΡΠ΅Π½ΠΈΡ ΡΠΈΠ½Π΅Π³ΠΎ ΡΠΏΠ΅ΠΊΡΡΠ°, ΡΡΠΎ ΠΏΡΠΎΡΠ²Π»ΡΠ΅ΡΡΡ ΡΠ½ΠΈΠΆΠ΅Π½ΠΈΠ΅ΠΌ ΡΠΈΡΠ»Π° ΠΠΠ/ΠΌΠ» ΡΠΎΠ²ΠΎΠΊΡΠΏΠ½ΠΎΠΉ ΠΌΠΈΠΊΡΠΎΡΠ»ΠΎΡΡ Π·ΡΠ±Π½ΠΎΠ³ΠΎ Π½Π°Π»ΡΡΠ°. ΠΠΎΠ»ΠΈΡΠ΅ΡΡΠ²ΠΎ ΠΠΠ ΡΠ½ΠΈΠΆΠ°Π΅ΡΡΡ ΡΠΎ Π·Π½Π°ΡΠ΅Π½ΠΈΡ 14,3Β±0,12 Γ 103/ΠΌΠ» Π΄ΠΎ Π·Π½Π°ΡΠ΅Π½ΠΈΡ 2,4Β±0,3 Γ 102/ΠΌΠ» ΠΏΠΎΡΠ»Π΅ ΠΎΠ±Π»ΡΡΠ΅Π½ΠΈΡ. Π‘ΠΎΠΏΠΎΡΡΠ°Π²Π»ΡΡ Π΄Π°Π½Π½ΡΠ΅ ΠΊΠΎΠ½ΡΡΠΎΠ»Ρ (ΠΈΡΡ
ΠΎΠ΄Π½ΠΎΠ΅ ΡΠΈΡΠ»ΠΎ Π²ΡΡΠΎΡΡΠΈΡ
ΠΊΠΎΠ»ΠΎΠ½ΠΈΠΉ) ΠΈ ΠΎΠΏΡΡΠ° (ΡΠΈΡΠ»ΠΎ ΠΊΠΎΠ»ΠΎΠ½ΠΈΠΉ, Π²ΡΡΠΎΡΡΠΈΡ
ΠΏΠΎΡΠ»Π΅ ΠΏΡΠΎΠ²Π΅Π΄Π΅Π½ΠΈΡ ΡΠΎΡΠΎΠ°ΠΊΡΠΈΠ²ΠΈΡΠΎΠ²Π°Π½Π½ΠΎΠΉ Π΄Π΅Π·ΠΈΠ½ΡΠ΅ΠΊΡΠΈΠΈ), ΠΌΡ ΡΡΡΠ°Π½ΠΎΠ²ΠΈΠ»ΠΈ, ΡΡΠΎ Π°Π½ΡΠΈΠΌΠΈΠΊΡΠΎΠ±Π½ΠΎΠ΅ Π΄Π΅ΠΉΡΡΠ²ΠΈΠ΅ ΡΠΎΡΠΎΠ°ΠΊΡΠΈΠ²ΠΈΡΠΎΠ²Π°Π½Π½ΠΎΠΉ Π΄Π΅Π·ΠΈΠ½ΡΠ΅ΠΊΡΠΈΠΈ Π½Π°Ρ
ΠΎΠ΄ΠΈΡΡΡ Π² ΠΏΡΡΠΌΠΎΠΉ Π·Π°Π²ΠΈΡΠΈΠΌΠΎΡΡΠΈ ΠΎΡ Π΄Π»ΠΈΡΠ΅Π»ΡΠ½ΠΎΡΡΠΈ ΠΎΠ±Π»ΡΡΠ΅Π½ΠΈΡ. Π’Π°ΠΊ, ΡΡΡΠ΅ΠΊΡΠΈΠ²Π½ΠΎΡΡΡ ΠΊΠΎΠΌΠ±ΠΈΠ½ΠΈΡΠΎΠ²Π°Π½Π½ΠΎΠ³ΠΎ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ΠΈΡ ΡΠΎΡΠΎΡΠ΅Π½ΡΠΈΠ±ΠΈΠ»ΠΈΠ·Π°ΡΠΎΡΠ° Ρ ΠΠΠΠ Π² 1,2 ΡΠ°Π·Π° ΠΏΡΠ΅Π²ΡΡΠ°Π΅Ρ Π°ΠΊΡΠΈΠ²Π½ΠΎΡΡΡ ΡΡΠ°ΠΊΡΠΈΠ΄ΠΈΠ½Π° Π»Π°ΠΊΡΠ°ΡΠ° (Π²ΡΠ΅ΠΌΡ ΡΠΊΡΠΏΠΎΠ·ΠΈΡΠΈΠΈ β 60 Ρ) ΠΈ Π² 2,0 ΡΠ°Π·Π° ΠΏΡΠ΅Π²ΡΡΠ°Π΅Ρ ΠΏΡΠΎΡΠΈΠ²ΠΎΠΌΠΈΠΊΡΠΎΠ±Π½ΡΠΉ ΡΡΡΠ΅ΠΊΡ Π»Π°Π·Π΅ΡΠ½ΠΎΠ³ΠΎ ΠΈΠ·Π»ΡΡΠ΅Π½ΠΈΡ ΡΠΈΠ½Π΅Π³ΠΎ ΡΠΏΠ΅ΠΊΡΡΠ° (Π²ΡΠ΅ΠΌΡ ΡΠΊΡΠΏΠΎΠ·ΠΈΡΠΈΠΈ β 120 Ρ).Π£ ΠΏΡΠΎΠ²Π΅Π΄Π΅Π½ΠΎΠΌΡ Π΄ΠΎΡΠ»ΡΠ΄ΠΆΠ΅Π½Π½Ρ Π²ΠΈΠ²ΡΠ°Π»ΠΈ Π²ΠΏΠ»ΠΈΠ² ΠΠΠΠ Π½Π° ΡΠ»Ρ ΡΠΎΡΠΎΡΠ΅Π½ΡΠΈΠ±ΡΠ»ΡΠ·Π°ΡΠΎΡΠ° (Π΅ΡΠ°ΠΊΡΠΈΠ΄ΠΈΠ½Ρ Π»Π°ΠΊΡΠ°ΡΡ) Π½Π° ΡΠ΅Π»Π΅ΠΊΡΠΈΠ²Π½Ρ Π΅Π»ΡΠΌΡΠ½Π°ΡΡΡ ΠΏΠ°ΡΠΎΠ³Π΅Π½Π½ΠΈΡ
Ρ ΡΠΌΠΎΠ²Π½ΠΎ-ΠΏΠ°ΡΠΎΠ³Π΅Π½Π½ΠΈΡ
ΠΌΡΠΊΡΠΎΠΎΡΠ³Π°Π½ΡΠ·ΠΌΡΠ². ΠΡΠ°Ρ
ΠΎΠ²ΡΡΡΠΈ ΡΠ΅, ΡΠΎ Π΅ΡΠ°ΠΊΡΠΈΠ΄ΠΈΠ½Ρ Π»Π°ΠΊΡΠ°ΡΡ ΠΏΡΠΈΡΠ°ΠΌΠ°Π½Π½Ρ Π²Π»Π°ΡΡΠΈΠ²ΠΎΡΡΡ Π°Π½ΡΠΈΡΠ΅ΠΏΡΠΈΠΊΠ°, ΡΠ»ΡΠ΄ Π±ΡΠ»ΠΎ Π²ΡΡΠ°Π½ΠΎΠ²ΠΈΡΠΈ ΠΌΠ°ΠΊΡΠΈΠΌΠ°Π»ΡΠ½ΠΎ ΠΌΠΎΠΆΠ»ΠΈΠ²ΠΈΠΉ ΡΠ°Ρ Π΄ΡΡ Π΅ΡΠ°ΠΊΡΠΈΠ΄ΠΈΠ½Ρ Π»Π°ΠΊΡΠ°ΡΡ ΡΠΊ ΡΠΎΡΠΎΡΠ΅Π½ΡΠΈΠ±ΡΠ»ΡΠ·Π°ΡΠΎΡΠ°. ΠΡΡΠ°Π½ΠΎΠ²Π»Π΅Π½ΠΎ, ΡΠΎ ΠΏΡΡΠ»Ρ Π΄ΡΡ ΡΠΈΠ²Π°Π½ΠΎΠ»Ρ (Π΅ΡΠ°ΠΊΡΠΈΠ΄ΠΈΠ½Ρ Π»Π°ΠΊΡΠ°ΡΡ) ΠΏΡΠΎΡΡΠ³ΠΎΠΌ 1,5-3-Ρ
Ρ
Π²ΠΈΠ»ΠΈΠ½ Π²ΡΠ΄Π·Π½Π°ΡΠ°Π»Π°ΡΡ Π±Π°ΠΊΡΠ΅ΡΠΈΡΠΈΠ΄Π½Π° Π΄ΡΡ Π½Π° ΠΌΡΠΊΡΠΎΠΎΡΠ³Π°Π½ΡΠ·ΠΌΠΈ. ΠΡΡ ΠΆ Π°Π½ΡΠΈΡΠ΅ΠΏΡΠΈΠΊΠ° Π² ΠΏΡΠΎΠΌΡΠΆΠΊΡ Π²ΡΠ΄ 30 Π΄ΠΎ 60 Ρ Π½Π΅ ΡΡΠΏΡΠΎΠ²ΠΎΠ΄ΠΆΡΠ²Π°Π»Π°ΡΡ Π²ΠΈΡΠ°ΠΆΠ΅Π½ΠΎΡ ΠΊΡΠ»ΡΠΊΡΡΠ½ΠΎΡ Π·ΠΌΡΠ½ΠΎΡ ΠΌΡΠΊΡΠΎΠ±Π½ΠΎΡ ΠΏΠΎΠΏΡΠ»ΡΡΡΡ. ΠΡΡΠ³ΠΈΠΌ Π΅ΡΠ°ΠΏΠΎΠΌ Π΄ΠΎΡΠ»ΡΠ΄ΠΆΠ΅Π½Π½Ρ ΡΡΠ°Π»ΠΎ Π²ΠΈΠ·Π½Π°ΡΠ΅Π½Π½Ρ ΡΡΡΠ»ΠΈΠ²ΠΎΡΡΡ ΠΌΡΠΊΡΠΎΠΎΡΠ³Π°Π½ΡΠ·ΠΌΡΠ² Π΄ΠΎ ΡΡΠ·Π½ΠΈΡ
ΠΊΠΎΠ½ΡΠ΅Π½ΡΡΠ°ΡΡΠΉ ΡΠΎΡΠΎΡΠ΅Π½ΡΠΈΠ±ΡΠ»ΡΠ·Π°ΡΠΎΡΠ°. ΠΠΈΠΊΠΎΡΠΈΡΡΠ°Π»ΠΈ Π²ΠΎΠ΄Π½ΠΈΠΉ ΡΠΎΠ·ΡΠΈΠ½ Π΅ΡΠ°ΠΊΡΠΈΠ΄ΠΈΠ½Ρ Π»Π°ΠΊΡΠ°Ρ Ρ ΠΊΠΎΠ½ΡΠ΅Π½ΡΡΠ°ΡΡΡΡ
0,1; 0,05; 0,01%. ΠΡΡΠΈΠΌΠ°Π½Ρ ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΠΈ Π΄ΠΎΠ·Π²ΠΎΠ»ΡΡΡΡ Π·ΡΠΎΠ±ΠΈΡΠΈ Π²ΠΈΡΠ½ΠΎΠ²ΠΎΠΊ, ΡΠΎ ΡΠΎΠ·ΡΠΈΠ½ Π΅ΡΠ°ΠΊΡΠΈΠ΄ΠΈΠ½Ρ Π»Π°ΠΊΡΠ°ΡΡ Π² ΠΊΠΎΠ½ΡΠ΅Π½ΡΡΠ°ΡΡΡ 0,1% ΠΏΡΠ΄Π²ΠΈΡΡΡ ΡΡΡΠ»ΠΈΠ²ΡΡΡΡ ΠΌΡΠΊΡΠΎΠΎΡΠ³Π°Π½ΡΠ·ΠΌΡΠ² Π΄ΠΎ Π΄ΡΡ Π½ΠΈΠ·ΡΠΊΠΎΡΠ½ΡΠ΅Π½ΡΠΈΠ²Π½ΠΎΠ³ΠΎ Π»Π°Π·Π΅ΡΠ½ΠΎΠ³ΠΎ Π²ΠΈΠΏΡΠΎΠΌΡΠ½ΡΠ²Π°Π½Π½Ρ. Π Ρ
ΠΎΠ΄Ρ ΠΏΡΠΎΠ²Π΅Π΄Π΅Π½ΠΎΠ³ΠΎ Π΅ΠΊΡΠΏΠ΅ΡΠΈΠΌΠ΅Π½ΡΡ Π±ΡΠ»ΠΎ Π²ΡΡΠ°Π½ΠΎΠ²Π»Π΅Π½ΠΎ Π°Π½ΡΠΈΠΌΡΠΊΡΠΎΠ±Π½Ρ Π΄ΡΡ ΠΊΠΎΠΌΠ±ΡΠ½ΠΎΠ²Π°Π½ΠΎΠ³ΠΎ Π²ΠΏΠ»ΠΈΠ²Ρ 0,1%-Π²ΠΎΠ³ΠΎ ΡΠΎΠ·ΡΠΈΠ½Ρ Π΅ΡΠ°ΠΊΡΠΈΠ΄ΠΈΠ½Ρ Π»Π°ΠΊΡΠ°ΡΡ Ρ Π»Π°Π·Π΅ΡΠ½ΠΎΠ³ΠΎ Π²ΠΈΠΏΡΠΎΠΌΡΠ½ΡΠ²Π°Π½Π½Ρ ΡΠΈΠ½ΡΠΎΠ³ΠΎ ΡΠΏΠ΅ΠΊΡΡΠ°, ΡΠΎ ΠΏΡΠΎΡΠ²Π»ΡΡΡΡΡΡ Π·Π½ΠΈΠΆΠ΅Π½Π½ΡΠΌ ΡΠΈΡΠ»Π° ΠΠ£Π/ΠΌΠ» ΡΡΠΊΡΠΏΠ½ΠΎΡ ΠΌΡΠΊΡΠΎΡΠ»ΠΎΡΠΈ Π·ΡΠ±Π½ΠΎΠ³ΠΎ Π½Π°Π»ΡΠΎΡΡ. ΠΡΠ»ΡΠΊΡΡΡΡ ΠΠ£Π Π·Π½ΠΈΠΆΡΡΡΡΡΡ Π·Ρ Π·Π½Π°ΡΠ΅Π½Π½Ρ 14,3Β±0,12 Γ 103/ΠΌΠ» Π΄ΠΎ Π·Π½Π°ΡΠ΅Π½Π½Ρ 2,4Β±0,3 Γ 102/ΠΌΠ» ΠΏΡΡΠ»Ρ ΠΎΠΏΡΠΎΠΌΡΠ½Π΅Π½Π½Ρ. ΠΡΡΡΠ°Π²Π»ΡΡΡΠΈ Π΄Π°Π½Ρ ΠΊΠΎΠ½ΡΡΠΎΠ»Ρ (ΠΏΠΎΡΠ°ΡΠΊΠΎΠ²Π΅ ΡΠΈΡΠ»ΠΎ ΠΊΠΎΠ»ΠΎΠ½ΡΠΉ, ΡΠΎ Π²ΠΈΡΠΎΡΠ»ΠΈ) Ρ Π΄ΠΎΡΠ»ΡΠ΄Ρ (ΡΠΈΡΠ»ΠΎ ΠΊΠΎΠ»ΠΎΠ½ΡΠΉ, ΡΠΎ Π²ΠΈΡΠΎΡΠ»ΠΈ ΠΏΡΡΠ»Ρ ΠΏΡΠΎΠ²Π΅Π΄Π΅Π½Π½Ρ ΡΠΎΡΠΎΠ°ΠΊΡΠΈΠ²ΠΎΠ²Π°Π½ΠΎΡ Π΄Π΅Π·ΡΠ½ΡΠ΅ΠΊΡΡΡ), ΠΌΠΈ Π²ΡΡΠ°Π½ΠΎΠ²ΠΈΠ»ΠΈ, ΡΠΎ Π°Π½ΡΠΈΠΌΡΠΊΡΠΎΠ±Π½Π° Π΄ΡΡ ΡΠΎΡΠΎΠ°ΠΊΡΠΈΠ²ΠΎΠ²Π°Π½ΠΎΡ Π΄Π΅Π·ΡΠ½ΡΠ΅ΠΊΡΡΡ Π·Π½Π°Ρ
ΠΎΠ΄ΠΈΡΡΡΡ Π² ΠΏΡΡΠΌΡΠΉ Π·Π°Π»Π΅ΠΆΠ½ΠΎΡΡΡ Π²ΡΠ΄ ΡΡΠΈΠ²Π°Π»ΠΎΡΡΡ ΠΎΠΏΡΠΎΠΌΡΠ½Π΅Π½Π½Ρ. Π’Π°ΠΊ, Π΅ΡΠ΅ΠΊΡΠΈΠ²Π½ΡΡΡΡ ΠΊΠΎΠΌΠ±ΡΠ½ΠΎΠ²Π°Π½ΠΎΠ³ΠΎ Π²ΠΈΠΊΠΎΡΠΈΡΡΠ°Π½Π½Ρ ΡΠΎΡΠΎΡΠ΅Π½ΡΠΈΠ±ΡΠ»ΡΠ·Π°ΡΠΎΡΠ° Π· ΠΠΠΠ Π² 1,2 ΡΠ°Π·ΠΈ ΠΏΠ΅ΡΠ΅Π²ΠΈΡΡΡ Π°ΠΊΡΠΈΠ²Π½ΡΡΡΡ Π΅ΡΠ°ΠΊΡΠΈΠ΄ΠΈΠ½Ρ Π»Π°ΠΊΡΠ°ΡΡ (ΡΠ°Ρ Π΅ΠΊΡΠΏΠΎΠ·ΠΈΡΡΡ β 60 Ρ) Ρ Π² 2,0 ΡΠ°Π·ΠΈ ΠΏΠ΅ΡΠ΅Π²ΠΈΡΡΡ Π°Π½ΡΠΈΠΌΡΠΊΡΠΎΠ±Π½ΠΈΠΉ Π΅ΡΠ΅ΠΊΡ Π»Π°Π·Π΅ΡΠ½ΠΎΠ³ΠΎ Π²ΠΈΠΏΡΠΎΠΌΡΠ½ΡΠ²Π°Π½Π½Ρ ΡΠΈΠ½ΡΠΎΠ³ΠΎ ΡΠΏΠ΅ΠΊΡΡΠ° (ΡΠ°Ρ Π΅ΠΊΡΠΏΠΎΠ·ΠΈΡΡΡ β 120 Ρ)
Analysis of fundamental parameters for V477 Lyr
We analyze the photometric and spectroscopic observations of the young pre-cataclysmic variable (pre-CV) V477 Lyr. The masses of both binary components have been corrected by analyzing their radial velocity curves. We show that agreement between the theoretical and observed light curves of the object is possible for several sets of its physical parameters corresponding to the chosen temperature of the primary component. The final parameters of V477 Lyr have been established by comparing observational data with evolutionary tracks for planetary nebula nuclei. The derived effective temperature of the O subdwarf is higher than that estimated by analyzing the object's ultraviolet spectra by more than 10000 K. This is in agreement with the analogous results obtained previously for the young pre-CVs V664 Cas and UU Sge. The secondary component of V477 Lyr has been proven to have a more than 25-fold luminosity excess compared to main-sequence stars of similar mass. Comparison of the physical parameters for the cool stars in young pre-CVs indicates that their luminosities do not correlate with the masses of the objects. The observed luminosity excesses in such stars show a close correlation with the post-common-envelope lifetime of the systems and should be investigated within the framework of the theory of their relaxation to the state of main-sequence stars. Β© 2008 Pleiades Publishing, Ltd
Spectral types of four binaries based on photometric observations
We present results of photometric and spectroscopic observations of four close binaries with subdwarf B components: PG 0918+029, PG 1000+408, PG 1116+301, PG 0001+275. We discovered that PG 1000+408 is a close binary, with the most probable orbital period being Porb = 1.041145 day. Based on a comparison of the observed light curves at selected orbital phases and theoretical predictions for their variations, all the systems are classified as doubly degenerate binaries with low-luminosity white-dwarf secondaries. Β© 2008 Pleiades Publishing, Ltd
PG 1316+678: A young pre-cataclysmic binary with weak reflection effects
The PG 1316+678 star is classified as a pre-cataclysmic binary, as is evidenced by its photometric and spectroscopic observations. Its orbital period is determined to be Porb = 3. 3803d, which coincides with the photometric period. The intensities of the emission HI and HeI lines are shown to vary synchronously with the brightness of the object (ΞmV = 0. 065m, ΞmR = 0. 08m). These variations arise as the UV radiation from the DAO white dwarf is reflected from the surface of the cold companion. The parameters of the binary are estimated and the time of its evolution after the common-envelope phase is determined to be t β 240 000 years. Thus, PG 1316+678 is a young pre-cataclysmic NN Ser variable with the smallest known photometric reflection effect. Β© 2013 Pleiades Publishing, Ltd
Steps Toward Determination of the Size and Structure of the Broad-Line Region in Active Galactic Nuclei. XVI. A Thirteen-Year Study of Spectral Variability in NGC 5548
We present the final installment of an intensive 13-year study of variations
of the optical continuum and broad H-beta emission line in the Seyfert 1 galaxy
NGC 5548. The data base consists of 1530 optical continuum measurements and
1248 H-beta measurements. The H-beta variations follow the continuum variations
closely, with a typical time delay of about 20 days. However, a year-by-year
analysis shows that the magnitude of emission-line time delay is correlated
with the mean continuum flux. We argue that the data are consistent with the
simple model prediction that the size of the broad-line region is proportional
to the square root of the ionizing luminosity. Moreover, the apparently linear
nature of the correlation between the H-beta response time and the nonstellar
optical continuum arises as a consequence of the changing shape of the
continuum as it varies, specifically with the optical (5100 A) continuum
luminosity proportional to the ultraviolet (1350 A) continuum luminosity to the
0.56 power.Comment: 20 pages plus 4 figures. Accepted for publication in The
Astrophysical Journa
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