289 research outputs found
Preparation and properties of hibryd organic-inorganic composites baced on poly-Ti02
Optically transparent hybrid organic-inorganic copolymers based on the poly-
TiO2, vinyl monomers and lactide or glycolide have been prepared. Optical and physi-
cal-mechanical properties of composites are depended with the ratio of components have
shown. Hybrid copolymers possess photochromic properties. By the UV light excitation
reversible darkening of the samples due to the transition Ti
4+
ļ Ti
3+
had observed. The
speed of transition depends on the copolymer composition.
When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/2059
Study on possible role of CYP1A1, GSTT1, GSTM1, GSTP1, NAT2 and ADRB2 genes polymorphisms in bronchial asthma development in children
Aim. To study the association of polymorphisms of the enzymes genes CYP1A1 (T6235C), first phase, and
NAT2 (Ñ481Ò, G590A, G857A), GSTM1 («0»), GSTT1 («0») and GSTP1 (A313G), second phase of the
detoxication system, as well as the ADRB2 (C79G) gene variants with the development of bronchial asthma
in children. Methods. Polymorphic variants were analyzed using PCR followed by RFLP analysis in 86
healthy individuals and in 114 patients with clinical diagnosis of bronchial asthma. Results. The frequency
of gene polymorphic variants of the enzymes of first and second phases of detoxification system as well as
the ADRB2 gene was established in the children with bronchial asthma and healthy individuals.
Conclusions. Ðolymorphic variants of the genes NAT2 (481Ò), GSTP1 (313G) and ADRB2 (79G) and their
combinations in geno- type were observed more frequently in the patients with bronchial asthma comparing
to the control group, which indicates their invol- vement in the pathogenesis of asthma in children
Keywords: bronchial asthma, detoxication system, 2-adrenoreceptor gene, polymorphism, combined
genotype.Мета. Дослідити зв’язок поліморфних варіантів генів ферментів першої – CYP1A1 (T6235C) та другої – NAT2 (С481Т, G590A, G857A), GSTM1 («0»), GSTT1 («0») і GSTP1 (A313G) фаз системи детоксикації, а також гена ADRB2 (C79G) з розвитком бронхіальної астми (БА) у дітей. Методи. Поліморфні варіанти вивчали за допомогою ПЛР та ПДРФ-аналізу у 86 здорових індивідів та у 114 пацієнтів з клінічним діагнозом БА. Результати. Встановлено частоту поліморфних варіантів генів
ферментів першої і другої фаз системи детоксикації, а також гена ADRB2 у хворих на БА дітей та
у здорових індивідів. Висновки. Поліморфні варіанти генів NAT2 (481Т), GSTP1 (313G) і ADRB2
(79G) та їхні комбінації в генотипі частіше спостерігаються серед пацієнтів з БА порівняно з контрольною групою, що свідчить на користь залучення їх до патогенезу БА у дітей.
Ключові слова: бронхіальна астма, система детоксикації, ген b2-адренорецептора, поліморфізм,
комбінований генотип.Цель. Исследовать ассоциацию полиморфных вариантов генов
ферментов первой – CYP1A1 (T6235C) и второй – NAT2
(С481Т, G590A, G857A), GSTM1 («0»), GSTT1 («0») и GSTP1
(A313G) фаз системы детоксикации, а также гена ADRB2
(C79G) с развитием бронхиальной астмы (БА) у детей. Методы. Полиморфные варианты изучали с помощью ПЦР и ПДРФанализа у 86 здоровых индивидов и 114 пациентов с клиническим диагнозом БА. Результаты. Установлена частота полиморфных вариантов генов ферментов первой и второй фаз
системы детоксикации, а также гена ADRB2 у больных БА детей и здоровых индивидов. Выводы. Полиморфные варианты
генов NAT2 (481Т), GSTP1 (313G) и ADRB2 79G и их комбинации в генотипе чаще наблюдаются среди пациентов с БА по
сравнению с контрольной группой, что свидетельствует в пользу их вовлечения в патогенез БА у детей.
Ключевые слова: бронхиальная астма, система детоксикации, ген b2-адренорецептора, полиморфизм, комбинированный
генотип
Estimation of Hydrodynamical Model Parameters from the Invariant Spectrum and the Bose-Einstein Correlations of pi-mesons Produced in (pi+/K+)p Interactions at 250 GeV/c
The invariant spectra of pi- mesons produced in (pi+/K+)p interactions at 250
GeV/c are analysed in the framework of the hydrodynamical model of
three-dimensionally expanding cylindrically symmetric finite systems.
A satisfactory description of experimental data is achieved.
The data favour the pattern according to which the hadron matter undergoes
predominantly longitudinal expansion and non-relativistic transverse expansion
with mean transverse velocity = 0.20(7), and is characterized by a large
temperature inhomogeneity in the transverse direction: the extracted freeze-out
temperature at the center of the tube and at the transverse rms radius are
140(3) MeV and 82(7) MeV, respectively. The width of the (longitudinal)
space-time rapidity distribution of the pion source is found to be Delta eta =
1.36(2).
Combining this estimate with results of the Bose-Einstein correlation
analysis in the same experiment, one extracts a mean freeze-out time of the
source of = 1.4(1) fm/c and its transverse geometrical rms radius, R_G
(rms)=1.2(2) fm.Comment: latex, 14 pages, 5 figure
Boost Invariance and Multiplicity Dependence of the Charge Balance Functionin and Collisions at GeV/c
Boost invariance and multiplicity dependence of the charge balance function
are studied in \pi^{+}\rp and \rK^{+}\rp collisions at 250 GeV/ incident
beam momentum. Charge balance, as well as charge fluctuations, are found to be
boost invariant over the whole rapidity region, but both depend on the size of
the rapidity window. It is also found that the balance function becomes
narrower with increasing multiplicity, consistent with the narrowing of the
balance function when centrality and/or system size increase, as observed in
current relativistic heavy ion experiments.Comment: 4 pages, 5 figures, Revte
Entropy Analysis in \pi^{+}\rp and \rK^{+}\rp Collisions at GeV
The entropy properties are analyzed by Ma's coincidence method in
\pi^{+}\rp and \rK^{+}\rp collisions of the NA22 experiment at 250 GeV/
incident momentum. By using the R\'{e}nyi entropies, we test the scaling law
and additivity properties in rapidity space. The behavior of the R\'{e}nyi
entropies as a function of the average number of particles is investigated. The
results are compared with those from the {\sc Pythia} Monte Carlo event
generator.Comment: LaTeX, 11 pages, 5 figure to be appeared in Acta Phys. Pol.
Estimation of hydrodynamical model parameters from the invariant spectrum and the Bose-Einstein correlations of -mesons produced in ( interactions at 250 GeV/c
The invariant spectra of pi- mesons produced in (pi+/K+)p interactions at 250 GeV/c are analysed in the framework of the hydrodynamical model of three-dimensionally expanding cylindrically symmetric finite systems. A satisfactory description of experimental data is achieved. The data favour the pattern according to which the hadron matter undergoes predominantly longitudinal expansion and non-relativistic transverse expansion with mean transverse velocity = 0.20(7), and is characterized by a large temperature inhomogeneity in the transverse direction: the extracted freeze-out temperature at the center of the tube and at the transverse rms radius are 140(3) MeV and 82(7) MeV, respectively. The width of the (longitudinal) space-time rapidity distribution of the pion source is found to be Delta eta = 1.36(2). Combining this estimate with results of the Bose-Einstein correlation analysis in the same experiment, one extracts a mean freeze-out time of the source of = 1.4(1) fm/c and its transverse geometrical rms radius, R_G (rms)=1.2(2) fm.The invariant spectra of pi- mesons produced in (pi+/K+)p interactions at 250 GeV/c are analysed in the framework of the hydrodynamical model of three-dimensionally expanding cylindrically symmetric finite systems. A satisfactory description of experimental data is achieved. The data favour the pattern according to which the hadron matter undergoes predominantly longitudinal expansion and non-relativistic transverse expansion with mean transverse velocity = 0.20(7), and is characterized by a large temperature inhomogeneity in the transverse direction: the extracted freeze-out temperature at the center of the tube and at the transverse rms radius are 140(3) MeV and 82(7) MeV, respectively. The width of the (longitudinal) space-time rapidity distribution of the pion source is found to be Delta eta = 1.36(2). Combining this estimate with results of the Bose-Einstein correlation analysis in the same experiment, one extracts a mean freeze-out time of the source of = 1.4(1) fm/c and its transverse geometrical rms radius, R_G (rms)=1.2(2) fm
Self-affine scaling from non-integer phase-space partition in and collisions at 250 GeV/
A factorial-moment analysis with real (integer and non-integer) phase space partition is applied to p and Kp collisions at 250 GeV/. Clear evidence is shown for self-affine rather than self-similar power-law scaling in multiparticle production. The three-dimensional self-affine second-order scaling exponent is determined to be 0.0610.010.A factorial-moment analysis with real (integer and non-integer) phase space partition is applied to p and Kp collisions at 250 GeV/. Clear evidence is shown for self-affine rather than self-similar power-law scaling in multiparticle production. The three-dimensional self-affine second-order scaling exponent is determined to be 0.0610.010.A factorial-moment analysis with real (integer and non-integer) phase space partition is applied to p and Kp collisions at 250 GeV/. Clear evidence is shown for self-affine rather than self-similar power-law scaling in multiparticle production. The three-dimensional self-affine second-order scaling exponent is determined to be 0.0610.010.A factorial-moment analysis with real (integer and non-integer) phase space partition is applied to π + p and K + p collisions at 250 GeV/ c . Clear evidence is shown for self-affine rather than self-similar power-law scaling in multiparticle production. The three-dimensional self-affine second-order scaling exponent is determined to be 0.061±0.010
Large Self-affine fractality in \p^+p and Kp collisions at 250 GeV/
Taking into account the anisotropy of phase space in multiparticle
production, a self-affine analysis of factorial moments was carried out on the
NA22 data for \p^+\Pp and \PK^+\Pp collisions at 250 GeV/. Within the
transverse plane, the Hurst exponents measuring the anisotropy are consistent
with unit value (i.e. no anisotropy). They are, however, only half that value
when the longitudinal direction is compared to the transverse ones. Fractality,
indeed, turns out to be self-affine rather than self-similar in multiparticle
production. In three-dimensional phase space, power-law scaling is observed to
be better realized in self-affine than in self-similar analysis.Comment: 10 pages and 4 figure
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