Precision calculation of energy levels for four-valent Si I

We report results of the calculation of the low-lying levels of neutral Si using a combination of the configuration interaction and many-body perturbation theory (CI+MBPT method). We treat Si I as an atom with four valence electrons and use two different starting approximations, namely $V^{N-2}$ and $V^{N-4}$. We conclude that both approximations provide comparable accuracy, on the level of 1%

Reading the Signs”: Aspects of Perception of a Game Polycode Text in Space of a Modern City

One of the new linguocreative practices of organizing the city space as a cultural text is analyzed. The game discourse of polycode texts is considered, which combine elements of different semiotic systems: signs of traffic rules, supplemented by visualized symbolic allusions and quotations, collectively referring to the motifs of famous works of art. The constructive principles of modeling the associative context of polycode posters placed in the Literary Quarter of Yekaterinburg are characterized. The universality of the generation of game texts of any semiotic nature on the basis of an operational technique that creates the effects of associative deducibility and associative integration is substantiated. The novelty of the study is related to the description of the algorithm for creating and deciphering a game polycode text of this type, identifying the factors and strategies for reading it by the addressee. The dynamic component of the semantic diversity of the analyzed texts is experimentally verified, taking into account the respondents’ recognition of the prototypes of the game transform, reflection on the connection between its visual and verbal components, and the ability to derive allusive implicatures. Particular attention is paid to the analysis of game transform decoding strategies in the light of the mechanisms of linguocreative thinking based on the switching of associative stereotypes in the language game register

Reaction of sodium salts of dialkylphosphorous acids with carboxylic acid nitriles

The reaction of the Na salts of dialkylphosphorous acids with nitriles leads to the dialkyl esters of N-(1-dialkylphosphonylalkyl) amidophosphoric acids, whose formation proceeds via the aminophosphonate-amidophosphate rearrangement of the sodium derivatives of bis(dialkylphosphonyl)alkylamines. © 1978 Plenum Publishing Corporation

Development of the cell-ELISA test for the subtype identification of circulating influenza A(H1) and A(H3) viruses

The sensitive version of cell-ELISA was developed for the subtype-specific differentiation of current influenza A(H1N1)pdm09 and A(H3N2) viruses that are circulating in the human population. This method is based on the estimation of virus reproduction in infected MDCK cells. The detection step of this method is an interaction of the subtype-specific monoclonal antibodies (mAbs) with the viral hemagglutinin (НА) molecule. The influenza A virus strains, isolated in the 2014 epidemic season, were used to validate this method.It was shown that when using mAbs # 1/ # 2 or # 4 at a concentration of 10-15 µg/ml, the developed variant of cell-ELISA was able to detect НА protein synthesized in the infected cells of influenza A(H3N2) and A(H1N1)pdm09 viruses, respectively.The developed method can be used for the identification of modern influenza A viruses with low hemagglutination activity, which is not possible by the conventional hemagglutination inhibition test.The sensitive version of cell-ELISA was developed for the subtype-specific differentiation of current influenza A(H1N1)pdm09 and A(H3N2) viruses that are circulating in the human population. This method is based on the estimation of virus reproduction in infected MDCK cells. The detection step of this method is an interaction of the subtype-specific monoclonal antibodies (mAbs) with the viral hemagglutinin (НА) molecule. The influenza A virus strains, isolated in the 2014 epidemic season, were used to validate this method. It was shown that when using mAbs # 1/ # 2 or # 4 at a concentration of 10-15 µg/ml, the developed variant of cell-ELISA was able to detect НА protein synthesized in the infected cells of influenza A(H3N2) and A(H1N1)pdm09 viruses, respectively. The developed method can be used for the identification of modern influenza A viruses with low hemagglutination activity, which is not possible by the conventional hemagglutination inhibition test

Reactions of triphenyl phosphite with di- and tribromoacetaldehydes

The reaction of triphenyl phosphite and di- and tribromoacetaldehydes proceeds through initial halophilic attack with subsequent formation of triphenyl phosphate and tetraphenylphosphonium bromide. © 1989 Plenum Publishing Corporation

Pentaalkoxyphosphoranes in the reactions of alkylene(1,1,3-trihydroperfluoropropyl) phosphites with chloral and bromal

For the first time, stable pentaalkoxyspirophosphoranes were isolated in addition to phosphoranes with P-C bond in the reactions of alkylene-(1,1,3-trihydroperfluoropropyl)phosphites with chloral or bromal. © 1987 Plenum Publishing Corporation

Reaction of 2-tert-butoxy-4,5-benzo-1,3,2-dioxaphospholane with tribromoacetaldehyde

The reaction of 2-tert-butoxy-4,5-benzo-1,3,2-dioxaphospholane with tribromo-acetaldehyde proceeds by initial halophilic attack on the bromine atom, leading to a product with retention of the P-Br bond (pyrocatechol bromophosphate) and an anion exchange product (pyrocatechol dibromovinylphosphate), and by initial attack at the carbon atom of the C=O group, which is accompanied by the elimination of isobutylene to form an α-hydroxyphosphonate. © 1990 Plenum Publishing Corporation

On the mechanism of acetone and diacetyl reactions with halogenophosphoranes

In this study the interaction of acetone and diacetyl with pyrocatecholtrihalogenophosphoranes (PTHP) containing a five-membered cycle which improves the stability of pentacoordinated phosphorus state was first observed. Using NMR spectroscopy technique the reaction of PTHP with acetone is shown to be a quantitative unidirectional process without formation of any stable intermediates. Unlike acetone, diacetyl interaction with phosphoranes results in formation of relatively stable pentacoordinated intermediates, the products of both carbonyl groups reaction