Universality in a Class of Q-Ball Solutions: An Analytic Approach

The properties of Q-balls in the general case of a sixth order potential have been studied using analytic methods. In particular, for a given potential, the initial field value that leads to the soliton solution has been derived and the corresponding energy and charge have been explicitly evaluated. The proposed scheme is found to work reasonably well for all allowed values of the model parameters.Comment: 9 Pages, 6 Figure

Metal-insulator transition induced by 16O -18O oxygen isotope exchange in colossal negative magnetoresistance manganites

The effect of 16O-18O isotope exchange on the electric resistivity was studied for (La(1-y)Pr(y))0.7Ca0.3MnO3 ceramic samples. Depending on y, this mixed perovskite exhibited different types of low-temperature behavior ranging from ferromagnetic metal (FM) to charge ordered (CO) antiferromagnetic insulator. It was found that at y=0.75, the substitution of 16O by 18O results in the reversible transition from a FM to a CO insulator at zero magnetic field. The applied magnetic field (H >= 2 T) transformed the sample with 18O again to the metallic state and caused the increase in the FM transition temperature Tc of the 16O sample. As a result, the isotope shift of Tc at H = 2 T was as high as 63 K. Such unique sensitivity of the system to oxygen isotope exchange, giving rise even to the metal-insulator transition, is discussed in terms of the isotope dependence of the effective electron bandwidth which shifts the balance between the CO and FM phases.Comment: 5 pages (RevTeX), 2 eps figures included, to appear in J. Appl. Phys. 83, (1998

МАРКЕРЫ ВОСПАЛЕНИЯ СОСУДИСТОЙ СТЕНКИ В ПОПУЛЯЦИИ КОРЕННОГО НАСЕЛЕНИЯ НЕНЕЦКОГО АВТОНОМНОГО ОКРУГА

Study of inflammatory markers of vascular wall in nenets population showed access of adopted reference values that can indicate serious violations of hemostasis system. However, apparent increase of inflammatory markers of vascular wall in blood can also give evidence of genetic traits of studied population and of necessity of review of reference values of inflammatory markers for studied population of native ethnos of the Arctic Region that is warrant further investigation.Исследование маркеров воспаления сосудистой стенки в выборке ненцев показало превышение принятых референсных значений, что может свидетельствовать о серьезных нарушениях в системе гемостаза. Однако наблюдаемое увеличение маркеров может также говорить о генетических особенностях изучаемой выборки и о целесообразности пересмотра референсных значений маркеров воспаления для исследуемой популяции коренного этноса Арктического региона, что требует дальнейшего изучения

A new approach to developing a logistic regression model variables to predict tree mortality, based on tree-ring growth dynamics

The annual tree increment is one of the integral indicators of abiotic and biotic processes occurring in the forest ecosystem. The use of logistic regression models based on annual tree-ring growth data is a promising approach to studying tree mortality. The diversity of logistic variables in scientific research is a result of various choices of statistics (average, median, growth trend, etc.) and their score in the time-window for the past N (5, 10, ..., 40) years. We propose a new scheme for the formation of logistic variables that involves fixing the statistics for calculating the average and choosing two non-intersecting time-windows based on measurements of the annual tree-rings growth. The choice of non-overlapping «windows» enables setting the ratio of the average growth of annual rings of trees between the windows for different periods of time. We examined the past 41 years of tree growth. Logistic regression models are constructed on a set of pairs of non-intersecting «windows» with a limit on the values of the sensitivity and specification of at least 1.6. The calculation of the percentage prediction if a tree is living or dying was done based on the contingency table in the logistic regression model. The logistic regression models were visualized using ROC curves. The models were compared on an expert scale based on the calculated area under the ROC curves. The obtained logistic regression model was verified by the bootstrap method. The calculations were carried out for the Siberian stone pine Pinus sibirica du Tour growing in the Baikal region (the Khamar-Daban Ridge) using the R programming language. The computed logistic regression model helped us predict live and dead trees in more than 80 % of cases

Semantic features of the phraseological units with the component light within the artistic discourse

Conduct lexical and semantic analysis on the concept light in the artistic discourse of postmodern fictio

Comparative analysis of photometric variability of TT ARI in the years 1994-1995 and 2001, 2004

We present the results of photometric observations of a bright cataclysmic variable TT Ari with an orbital period of 0. 13755 days. CCD observations were carried out with the Russian-Turkish RTT 150 telescope in 2001 and 2004 (13 nights). Multi-color photoelectric observations of the system were obtained with the Zeiss 600 telescope of SAO RAS in 1994-1995 (6 nights). In 1994-1995, the photometric period of the system was smaller than the orbital one (0. d132 and 0. d134), whereas it exceeded the latter (0. d150 and 0. d148) in 2001, 2004. An additional period exceeding the orbital one (0. d144) is detected in 1995 modulations. We interpret it as indicating the elliptic disc precession in the direction of the orbital motion. In 1994, the variability in colors shows periods close to the orbital one (0. d136, b-v), as well as to the period indicating the elliptic disk precession (0. d146, w-b). We confirm that during the epochs characterized by photometric periods shorter than the orbital one, the quasi-periodic variability of TT Ari at time scales about 20 min is stronger than during epochs with long photometric periods. In general, the variability of the system can be described as a "red" noise with increased amplitudes of modulations at characteristic time scales of 10-40 min. © 2013 Pleiades Publishing, Ltd

Development and Testing of Monoclonal Antibodies-Based Diagnostic Preparation for <i>Bacillus anthracis</i> Spores Detection Using Latex Agglutination Method

Immobilization of anti-B. anthracis monoclonal antibodies (MAbs) on latex microparticles was studied, the optimal load of these MAbs was determined to be 20 µg for 50 µl of the stock latex suspension. The highest sensitivity of latex agglutination test was observed for 1E6 MAbs. Latex suspensions with immobilized MAbs were lyophilized. Their sensitivity and specificity were shown to be highly competitive with those of the stock liquid latex suspension. Latex diagnosticum for Bacillus anthracis spores detection was constructed on the basis of these lyophilized reagents, developed and approved was the regulatory documentation that included their application instructions and technical specifications. Carried out were inter-laboratory and commission tests of experimental prototypes of the designed latex diagnosticum. These preparations demonstrated high sensitivity (from 1·105 to 2·106 spores/ml and even more) and specificity (absence of cross-reactions with spores of different species of sporogenous bacilli at concentration of 108 spores/ml)

Особенности фенотипического и генотипического липидного статуса коренного этноса Арктики в условиях островного проживания

Introduction. Dyslipidemia and obesity are interdisciplinary and “multi-metabolic” diseases, pathogenetically associated with the development of atherothrombosis, which creates practical health problems. The development of both dyslipidemia and obesity is influenced by socio-demographic, environmental, genetic and many physiological and behavioral factors, while the contribution of genetic factors is 40-70%. The goal is to identify the genetic characteristics oflipid status and fat metabolism in the indigenous ethnic group of the Arctic region of the Russian Federation under conditions of permanent islandliving.Methods. A cross-sectional population study of an indigenous ethnic group (n = 44) living on Vaygach Island (70 ° 01 ' Nlat 59 ° 33 ' E). The reported study was funded by RFBR according to the research project №18-00-00814-(18-00-00478). Serum cholesterol and triglycerides were determined as markers oflipid metabolism in blood serum. To analyze the genetic profile, the polymorphism of the FTO A23525T gene and the LPL Ser447Ter gene was determined by polymerase chain reaction.Results. In the sample of the indigenous ethnic group, BMI was 26.0 [21.5; 29.75] kg/m2. BMI for men is 23.0 [18.0; 28.0] kg/m2, for women - 25.0 [18.0; 29.25] kg / m2. Carriers of the unfavorable allele A had a higher BMI than carriers of the T allele. Analysis of the effect of rs9939609 genetic polymorphism on thelevel of total cholesterol did not show statistically significant differences between the FTO gene genotypes. A minimal triglyceride concentration was observed in carriers of the protective genotype Ter/Ter.Conclusion. Understanding the similarities and differences in genetic susceptibility among different ethnic groups can ultimately contribute to a more focused primary prevention and patient-oriented approach of cardiovascular pathology. Введение. Дислипидемия и ожирение являются междисциплинарными и мультиметаболическими состояниями, патогенетически связаны с развитием атеротромбоза, являясь важной проблемой практического здравоохранения. На развитие как дислипидемии, так и ожирения влияют социально-демографические, экологические, генетические и многие физиологические и поведенческие факторы, при этом вклад генетических факторов составляет 40-70%.Цель - выявить генетические особенности липидного статуса и жирового обмена у коренного этноса арктического региона РФ в условиях постоянного островного проживания. Методы. Проведено поперечное популяционное исследование коренного этноса (п = 44), проживающего на острове Вайгач (70°01' с. ш. 59°33' в. д.) в период комплексной научной экспедиции, выполняемой в рамках финансирования РФФИ гранта №18-00-00814-КОМФИ (18-00-00478). В качестве маркеров липидного обмена в сыворотке крови определяли общий холестерин и триглицериды. Для анализа генетического профиля определяли полиморфизм гена FTO A23525T и гена LPL Ser447Ter методом полимеразной цепной реакции.Результаты. В выборке коренного этноса ИМТ составил 26,0 [21,5; 29,75] кг/м2. ИМТ для мужчин - 23,0 [18,0; 28,0] кг/м2, для женщин - 25,0 [18,0; 29,25] кг/м2. Носители неблагоприятного аллеля А имели более высокий ИМТ, чем носители аллеля Т. Анализ влияния генетического полиморфизма rs9939609 на уровень общего холестерина не показал статистически значимых отличий между генотипами гена FTO. Минимальная концентрация триглицеридов была отмечена у носителей протективного генотипа Ter/Ter.Заключение. Понимание сходства и различий в генетической восприимчивости среди разных этносов может в конечном итоге способствовать более целенаправленной первичной профилактике и пациентоориентированному подходу сердечно-сосудистой патологии