РОЛЬ ГЕНА α2β-АДРЕНОРЕЦЕПТОРА В РАЗВИТИИ НАРУШЕНИЙ ВНУТРИЖЕЛУДОЧКОВОЙ ПРОВОДИМОСТИ

Background: The purpose of this study was to investigate association between the genetic polymorphism I/D of gene α2β-adrenoreceptor (ADRA2B) and hereditary disorders of ventricular conduction. Patients and methods: In this study, 102 people with complete left bundle branch block (45,71±1,852 years) — 46 females and 56 males, and 86 people with complete right bundle branch block (34,59±1,86 years) — 41 females and 45 males. The study was approved by Ethic Committee of the KrasSMU. All participants were included in the study after written informed consent form. Cardiological examination included clinical examination, electrocardiography, echocardiography, Holter monitoring, stresstest, koronaroangiografy and radionuclide method of a myocardium and molecular and genetic researches. Results: Statistically, significant prevalence of a homozygous genotype of DD on rare allele gene ADRA2B in both groups in comparison with group of control is established. The reliable dominance of the homozygous rare genotypes (D allele) of gene ADRA2B were detected in all groups. Conclusion: Polymorphism DD of a gene ADRA2B is a genetic predictor of predisposition to the blockade of the right and left bundle branch block.Цель исследования: изучить ассоциацию I/D-полиморфизма гена α2β-адренорецептора (ADRA2B) с первичными нарушениямивнутрижелудочковой проводимости. Пациенты и методы: в исследование были включены лица с наследственными нарушениями внутрижелудочковой проводимости. Обследовано 102 человека с нарушением проводимости по левой ножке пучка Гиса (45,71±1,85 лет; 46 женщин и 56 мужчин) и 86 — с нарушением проводимости по правой ножке пучка Гиса (34,59±1,86 лет; 41 женщина и 45 мужчин). Научное исследование одобрено Этическим комитетом КрасГМУ. Всем обследуемым с нарушениями сердечной проводимости было проведено клинико-инструментальное исследование по следующей программе: клинический осмотр, электро- и эхокардиография, холтеровское мониторирование, велоэргометрия, коронароангиография и сцинтиграфия миокарда, молекулярно-генетические исследования. Результаты: установлено статистически значимое преобладание гомозиготного генотипа DD по редкому аллелю гена ADRA2B в обеих группах по сравнению с группой контроля. Выводы: полиморфизм DD гена ADRA2B является генетическим предиктором предрасположенности к возникновению полной блокады правой и левой ножки пучка Гиса

Valence band excitations in V_2O_5

We present a joint theoretical and experimental investigation of the electronic and optical properties of vanadium pentoxide. Electron energy-loss spectroscopy in transmission was employed to measure the momentum-dependent loss function. This in turn was used to derive the optical conductivity, which is compared to the results of band structure calculations. A good qualitative and quantitative agreement between the theoretical and the experimental optical conductivity was observed. The experimentally observed anisotropy of the optical properties of V_2O_5 could be understood in the light of an analysis of the theoretical data involving the decomposition of the calculated optical conductivity into contributions from transitions into selected energy regions of the conduction band. In addition, based upon a tight binding fit to the band structure, values are given for the effective V3d_xy-O2p hopping terms and are compared to the corresponding values for alpha'-NaV_2O_5.Comment: 6 pages (revtex),6 figures (jpg

Measurement of RudsR_{\text{uds}} and RR between 3.12 and 3.72 GeV at the KEDR detector

Using the KEDR detector at the VEPP-4M $e^+e^-$ collider, we have measured the values of $R_{\text{uds}}$ and $R$ at seven points of the center-of-mass energy between 3.12 and 3.72 GeV. The total achieved accuracy is about or better than $3.3\%$ at most of energy points with a systematic uncertainty of about $2.1\%$. At the moment it is the most accurate measurement of $R(s)$ in this energy range

Search for narrow resonances in e+ e- annihilation between 1.85 and 3.1 GeV with the KEDR Detector

We report results of a search for narrow resonances in e+ e- annihilation at center-of-mass energies between 1.85 and 3.1 GeV performed with the KEDR detector at the VEPP-4M e+ e- collider. The upper limit on the leptonic width of a narrow resonance Gamma(R -> ee) Br(R -> hadr) < 120 eV has been obtained (at 90 % C.L.)

New precise determination of the \tau lepton mass at KEDR detector

The status of the experiment on the precise $\tau$ lepton mass measurement running at the VEPP-4M collider with the KEDR detector is reported. The mass value is evaluated from the $\tau^+\tau^-$ cross section behaviour around the production threshold. The preliminary result based on 6.7 pb$^{-1}$ of data is $m_{\tau}=1776.80^{+0.25}_{-0.23} \pm 0.15$ MeV. Using 0.8 pb$^{-1}$ of data collected at the $\psi'$ peak the preliminary result is also obtained: $\Gamma_{ee}B_{\tau\tau}(\psi') = 7.2 \pm 2.1$ eV.Comment: 6 pages, 8 figures; The 9th International Workshop on Tau-Lepton Physics, Tau0

Measurement of \Gamma_{ee}(J/\psi)*Br(J/\psi->e^+e^-) and \Gamma_{ee}(J/\psi)*Br(J/\psi->\mu^+\mu^-)

The products of the electron width of the J/\psi meson and the branching fraction of its decays to the lepton pairs were measured using data from the KEDR experiment at the VEPP-4M electron-positron collider. The results are \Gamma_{ee}(J/\psi)*Br(J/\psi->e^+e^-)=(0.3323\pm0.0064\pm0.0048) keV, \Gamma_{ee}(J/\psi)*Br(J/\psi->\mu^+\mu^-)=(0.3318\pm0.0052\pm0.0063) keV. Their combinations \Gamma_{ee}\times(\Gamma_{ee}+\Gamma_{\mu\mu})/\Gamma=(0.6641\pm0.0082\pm0.0100) keV, \Gamma_{ee}/\Gamma_{\mu\mu}=1.002\pm0.021\pm0.013 can be used to improve theaccuracy of the leptonic and full widths and test leptonic universality. Assuming e\mu universality and using the world average value of the lepton branching fraction, we also determine the leptonic \Gamma_{ll}=5.59\pm0.12 keV and total \Gamma=94.1\pm2.7 keV widths of the J/\psi meson.Comment: 7 pages, 6 figure

Measurement of main parameters of the \psi(2S) resonance

A high-precision determination of the main parameters of the \psi(2S) resonance has been performed with the KEDR detector at the VEPP-4M e^{+}e^{-} collider in three scans of the \psi(2S) -- \psi(3770) energy range. Fitting the energy dependence of the multihadron cross section in the vicinity of the \psi(2S) we obtained the mass value M = 3686.114 +- 0.007 +- 0.011 ^{+0.002}_{-0.012} MeV and the product of the electron partial width by the branching fraction into hadrons \Gamma_{ee}*B_{h} = 2.233 +- 0.015 +- 0.037 +- 0.020 keV. The third error quoted is an estimate of the model dependence of the result due to assumptions on the interference effects in the cross section of the single-photon e^{+}e^{-} annihilation to hadrons explicitly considered in this work. Implicitly, the same assumptions were employed to obtain the charmonium leptonic width and the absolute branching fractions in many experiments. Using the result presented and the world average values of the electron and hadron branching fractions, one obtains the electron partial width and the total width of the \psi(2S): \Gamma_{ee} =2.282 +- 0.015 +- 0.038 +- 0.021 keV, \Gamma = 296 +- 2 +- 8 +- 3 keV. These results are consistent with and more than two times more precise than any of the previous experiments

INVESTIGATION OF NON-LINEAR PARAMETRIC SOUND RECEPTION

L'article présente les résultats d'une recherche expérimentale concernant un récepteur acoustique non linéaire paramétrique dans la bande de fréquence 10 à 20 kHz. On donne également le schéma de principe d'un dispositif qui a été développé ; celui-ci est le complément à un ensemble de dispositifs d'émission paramétrique.The paper presents the results of an experimental research of nonlinear parametric sound receiver in the frequency range of 10-20000 c.p.s. The structural scheme of a developed arrangement is given as well. The arrangement is an additional part to a set of arrangement of parametric sound radiator

ФАКТИЧЕСКОЕ ПОТРЕБЛЕНИЕ И ОБЕСПЕЧЕННОСТЬ ВИТАМИНАМИ И КАЛЬЦИЕМ ПРИ ОСТЕОПОРОЗЕ: ОЦЕНКА ПО ПОТРЕБЛЕНИЮ И КОНЦЕНТРАЦИИ В ПЛАЗМЕ КРОВИ

Aim:  To assess the providing an organism with vitamins (А, В2, С, Е), β-carotene, and calcium in osteoporosis patients by measuring their intake and plasma concentrations. Materials and methods: 108 pairs “osteoporosis patient – healthy volunteer” aged 64.29±9.73 years were formed using a “case-control” method. Real intake of vitamins and calcium was studied defining the frequency of food taking for a month using questionnaire method. Daily intake of vitamins А, В2, С, Е, β-carotene, and calcium was calculated based on the analysis of the frequency of food taking. Among the basic group, using randomized method, 60% of osteoporosis patients were selected who underwent definition of plasma levels of vitamins А, В2, С, and Е. The same study was performed in 60 control volunteers. Results: Correlation of the intake of vitamins A, C, and β-carotene with their plasma levels wasn’t noted. It may reveal an increased need in these nutrients in osteoporosis. According to the calcium intake, every osteoporosis patient can be attributed to a population category with deep insufficiency of calcium intake (less than 500 mg a day). Conclusion: The data obtained need further investigation and, first of all, in clinical and biochemical fields (enzymatic non-provision for calcium uptake, clinical manifestations of insufficient provision with nutrients). Solution of these problems would enable regulation of food intake concerning calcium uptake in osteoporosis.Цель – оценка обеспеченности витаминами А, В2, С, Е, β-каротином и кальцием при остеопорозе по потреблению и концентрации в плазме крови. Материал и методы. Методом «случай – контроль» сформировано 108 пар «больной остеопорозом – здоровый» в возрасте 64,29±9,73 года. Изучение фактического питания проведено методом определения частоты потребления пищевых продуктов в течение месяца с использованием анкеты. На основании данных анализа частоты потребления пищи рассчитывали суточное потребление витаминов А, В2, С, Е, ß-каротина и кальция. В основной группе больных остеопорозом случайным методом выделена 60% выборка, в которой определена концентрация в плазме крови витаминов А, В2, С, Е, β-каротина и кальция. Аналогичные исследования проведены у 60 человек из контрольной группы. Результаты. Выявлено несоответствие между потреблением витаминов А, С и β-каротина с их уровнем в плазме крови, что позволило предположить повышенную потребность в этих нутриентах при остеопорозе. Согласно данным по потреблению кальция, каждого второго больного остеопорозом можно отнести к категории глубокой недостаточности потребления кальция (менее 500 мг/сут). Заключение. Полученные данные подлежат детальному изучению, прежде всего на клиническом и биохимическом уровнях (отсутствие ферментативной обеспеченности усвоения кальция, клинические проявления недостаточной обеспеченности нутриентами). Знание этих вопросов позволило бы регулировать рацион питания в отношении потребления кальция при остеопорозе