QED Effects in Heavy Few-Electron Ions

Accurate calculations of the binding energies, the hyperfine splitting, the bound-electron g-factor, and the parity nonconservation effects in heavy few-electron ions are considered. The calculations include the relativistic, quantum electrodynamic (QED), electron-correlation, and nuclear effects. The theoretical results are compared with available experimental data. A special attention is focused on tests of QED in a strong Coulomb field.Comment: 28 pages, 6 tables, 5 figure

Исследование процесса катодного электроформования шарообразных осадков из сульфатно-хлоридных электролитов

Traditionally, hot-rolled nickel anodes are used in the production of electroplating coatings. The main disadvantages of these anodes are: low specific surface area, large volume of anode scrap. The aim of the research was to study and develop the process of obtaining spherical nickel cathode precipitates for their subsequent use as soluble nickel anodes. As a result of the experiments, spherical cathode precipitates were obtained, the plasticity and porosity of which meet the requirements of the existing standard.Традиционно в производстве гальванических покрытий используются горячекатаные никелевые аноды. Основными недостатками этих анодов являются: низкая удельная поверхность, большой объем анодного скрапа. Целью исследования явилось изучение и разработка процесса получения сферических никелевых катодных осадков для их последующего использования в качестве растворимых никелевых анодов. В результате проведенных экспериментов были получены катодные осадки сферической формы, пластичность и пористость которых соответствуют требованиям существующего стандарта

Nitric Oxide Involvement in Regulation of the Growth Activity of Nonmorphogenic Tartary Buckwheat Callus

The research presented in this paper is aimed to determine the role of nitric oxide (NO) in the regulation of cyclin D3;1 (CYCD3;1) and cyclin-dependent kinase A1;1 (CDKA1;1) expression. The nonmorphogenic callus of Tartary buckwheat (Fagopyrum tataricum (L.) Gaertn.) with high growth activity has been taken as the object of study. The methods of spectrophotometry and real-time PCR have been used. In the first stage of the research, the dynamics of intracellular NO content and mitotic activity of callus cells have been compared. It has been noted that the peak of NO content precedes the peak of mitotic activity of the callus. It has been revealed that the maximum level of CYCD3;1 expression observed the day after the callus transfer to a new medium coincides with the peak of NO content and precedes the peak of mitotic activity. The addition of NO donor sodium nitroprusside to the culture medium has caused an increase in the mitotic index and CYCD3;1 expression, while the NO scavenger – 2-(4-carboxyphenyl)-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide (cPTIO) – has decreased CYCD3;1 expression and the mitotic index. In both cases, a decrease in CDKA1;1 expression has been found. Both sodium nitroprusside and cPTIO has had no strict specificity and influenced not only NO, but also H2O2 content. The possible mechanisms of interaction between reactive oxygen and nitrogen species signalling pathways have been discussed in this paper. Based on the results of the study it has been concluded about the possibility of NO involvement in the regulation of not only CYCD3;1 expression, but also CDKA1;1 expression. It has been suggested that the regulatory effect of NO on CDKA1;1 expression may be mediated by cellular redox state changes

Агитационное выщелачивание руды месторождения «Томтор» растворами серной и азотной кислот в атмосферных условиях

Experimental studies of various variants of agitation leaching of ore from the Tomtor deposit with dilute solutions of sulfuric and nitric acids under atmospheric conditions were carried out according to individual and combined two-stage schemes. It was found that in all leaching variants, REE, Sc, P and impurity elements (Fe, Al, Th) are recovered into the solution, and the degree of this extraction varies depending on the consumption of the main reagent and the leaching conditions. The results of the experiments showed that the practical application of the scheme of combined two-stage treatment of ores of the Tomtor deposit with nitric and sulfuric acids is practically impractical due to the low recovery rates of REE, Sc, P and impurity elements (Fe, Al, Th) in the solution.Проведены экспериментальные исследования различных вариантов агитационного выщелачивания руды месторождения «Томтор» разбавленными растворами серной и азотной кислот в атмосферных условиях по индивидуальным схемам и в качестве комбинированной двухстадийной схемы. Установлено, что при всех вариантах выщелачивания происходит излечение REE, Sc, Р и примесных элементов (Fe, Al, Th) в раствор, причем степень этого извлечения изменялась в зависимости от расхода основного реагента и условий выщелачивания. Результаты проведенных экспериментов показали, что практическое применение схемы комбинированной двухстадийной обработки руд месторождения «Томтор» азотной и серной кислотами практически нецелесообразно вследствие невысоких показателей извлечения REE, Sc, Р и примесных элементов (Fe, Al, Th) в раствор

Dust concentration in the urban environment air depending on traffic intensity and time of year (on the example of the Volgograd city)

Measurements of the small-dispersed dust concentration on 50 roads intersections in morning and evening, in winter and spring periods in the Volgograd city. A comparative analysis of the small-dispersed dust concentration in morning and evening is carried out, and the results, obtained in winter and spring, are compared. Methods to reduce dust emission from the roadway are proposed

Model System for Antiviral Peptide Transport Characterization

Abstract: Determination of the mechanism of action of potential medicinal substances is an integral stage in development of novel drugs. The interaction of antiviral peptide PB16–14 with lipid membranes in cell and cell-free model systems is demonstrated. Penetration of a fluorescently tagged analog of peptide into cells has been observed for 15 min using continuous-flow cytofluorometry and confocal microscopy. The specific features of interaction of the peptide under study with cell membranes have been studied using small-angle neutron scattering (SANS), atomic force microscopy (AFM), and dynamic light scattering. It is shown that model liposomes (PC/PG) increased in size in the presence of peptide (in a 5% ethanol/5% DMSO/PBS buffer), while the ζ potential changed only slightly, which can be interpreted as a consequence of a change in the surface charge and may indicate peptide ability to interact with a lipid bilayer (not excluding its penetration into the membrane). The data obtained can be used both for studying the mechanism of therapeutic peptide transport and for developing drug-delivery agents