Near-threshold production of a0(980)a_0(980)-mesons in πN\pi N and NN collisions and a0/f0a_0/f_0-mixing

We consider near-threshold $a_0(980)$-meson production in $\pi N$ and $NN$ collisions. An effective Lagrangian approach with one-pion exchange is applied to analyze different contributions to the cross section for different isospin channels. The Reggeon exchange mechanism is also evaluated for comparison. The results from $\pi N$ reactions are used to calculate the contribution of the $a_0$ meson to the cross sections and invariant $K \bar K$ mass distributions of the reactions $pp\to pn K^+\bar K^0$ and $pp\to pp K^+K^-$. It is found that the experimental observation of $a_0^+$ mesons in the reaction $pp\to pn K^+\bar K^0$ is much more promising than the observation of $a_0^0$ mesons in the reaction $pp\to pp K^+K^-$. Effects of isospin violation in the reactions $pN \to d a_0$, $pd \to \mathrm{^3He/^3H} a_0$, and $dd \to \mathrm{^4He} a_0$, which are induced by $a_0(980)$--$f_0(980)$ mixing, are also analyzed.Comment: 43 pages, including 16 eps figures, to be bublished in Phys. Atom. Nucl. (Yad. Fiz.) vol. 65, No. 11 (2002

Aspects of a0-f0 mixing in the reaction pn->da0

Some aspects of a0-f0 mixing effects in the reaction ${\vec p} n\to da^0_0$ with perpendicular polarized proton beam are discussed. An angular--asymmetry parameter $A$ is defined to study those effects. It is shown that, for energies close to the production threshold, the angular--asymmetry parameter $A(\theta, \phi)$ is proportional to the a0-f0 mixing amplitude for arbitrary polar and azimuthal angles $\theta$ and $\phi$ of the outgoing $a_0$ meson. This statement is also valid for arbitrary energies, but then only at polar angles $\theta=0^0$ and $\theta=90^0$. The mass dependence of the differential cross section $d\sigma/dm_{\pi^0\eta}$ in the reaction $pn\to d\pi^0\eta$ in the presence of \mix mixing is also discussed.Comment: 17 pages, 3 Figure

Neurotrophic and antioxidant potential of neuropeptides and trace elements

Neurotrophic therapy with brain extract-based drugs has been performed for decades. The basis for their neurotrophic activity is amino acids and neuropeptides. However, incomplete information on the composition of these drugs precludes a detailed description of mechanisms through which their pharmacological effects occur. The review considers the results of the most recent molecular pharmacological investigations and the mechanisms of therapeutic action of cerebrolysin

Dissecting the long-term emission behaviour of the BL Lac object Mrk 421

We report on long-term multiwavelengthmonitoring of blazar Mrk 421 by the GLAST-AGILE Support Program of the Whole Earth Blazar Telescope (GASP-WEBT) collaboration and Steward Observatory, and by the Swift and Fermi satellites. We study the source behaviour in the period 2007–2015, characterized by several extreme flares. The ratio between the optical, X-ray and γ -ray fluxes is very variable. The γ -ray flux variations show a fair correlation with the optical ones starting from 2012.We analyse spectropolarimetric data and find wavelengthdependence of the polarization degree (P), which is compatible with the presence of the host galaxy, and no wavelength dependence of the electric vector polarization angle (EVPA). Optical polarimetry shows a lack of simple correlation between P and flux and wide rotations of the EVPA.We build broad-band spectral energy distributions with simultaneous near-infrared and optical data from the GASP-WEBT and ultraviolet and X-ray data from the Swift satellite. They show strong variability in both flux and X-ray spectral shape and suggest a shift of the synchrotron peak up to a factor of ∼50 in frequency. The interpretation of the flux and spectral variability is compatible with jet models including at least two emitting regions that can change their orientation with respect to the line of sight.http://10.0.4.69/mnras/stx2185Accepted manuscrip

Hard Photodisintegration of a Proton Pair

We present a study of high energy photodisintegration of proton-pairs through the gamma + 3He -> p+p+n channel. Photon energies from 0.8 to 4.7 GeV were used in kinematics corresponding to a proton pair with high relative momentum and a neutron nearly at rest. The s-11 scaling of the cross section, as predicted by the constituent counting rule for two nucleon photodisintegration, was observed for the first time. The onset of the scaling is at a higher energy and the cross section is significantly lower than for deuteron (pn pair) photodisintegration. For photon energies below the scaling region, the scaled cross section was found to present a strong energy-dependent structure not observed in deuteron photodisintegration.Comment: 7 pages, 3 figures, for submission to Phys. Lett.

Оценка эффективности витаминно-минерального комплекса магния лактата и пиридоксина как средства коррекции отклонений элементного гомеостаза у молодых людей, проживающих на территории Ивановской области

Resume. The study of the elemental status of young people aged 19 to 25 years living in the Ivanovo region, an estimate of the prevalence of premorbid forms of health disorders and the possibility of its correction with the help of a vitamin-mineral complex containing magnesium lactate and pyridoxine.Проведено исследование элементного статуса молодых людей в возрасте от 19 до 25 лет, проживающих на территории Ивановской области, дана оценка распространённости преморбидных форм нарушения здоровья и установлена возможность его коррекции с помощью витаминно-минерального комплекса, содержащего магния лактат и пиридоксин

Комплексная оценка неврологического статуса и метаболических эффектов витаминно-минерального комплекса Теравит Антистресс и его компонентов

In the experimental study, the effect of the vitamin-mineral complex Teravit Antistress and its individual components: Ginseng and Ginkgo Biloba on the orientation-research behavior, resistance to stress and the course of metabolic processes in laboratory rats were studied.В экспериментальном исследовании изучили влияние витаминно-минерального комплекса Теравит Антистресс и его отдельных компонентов: женьшеня и гинкго билоба на ориентировочно-исследовательское поведение, устойчивость к стрессовым воздействиям и течение метаболических процессов у лабораторных кры

Sleep disorders interactions with obesity and type 2 diabetes

Obesity and type II diabetes are 21st century pandemia. These metаbolic disorders are in the focus of attention of various specialties: cardiologists, endocrinologists, nutritionists, therapists, and others. The high incidence of obesity and type II diabetes cardiovascular complications, such as myocardial infarction, stroke, chronic heart failure, dementia, determine the call of risk factors search. Modifiable factors may include sleep disturbances. Recent studies have revealed a connection between changes in sleep duration and metabolic disorders. However, to date, the mechanisms underlying this association have not been established. The aim of the review is to summarize existing epidemiological and experimental observations, as well as an analysis of possible pathophysiological mechanisms linking sleep duration with obesity and type II diabetes. The article considers current data suggesting a bi-directional association of sleep disorders with obesity and diabetes. Sleep disturbances are significant determinant of developing metabolic disorders. Sleep duration correction as one of therapeutic targets for cardiovascular complications of obesity and type II diabetes prevention