Determination of meteor flux distribution over the celestial sphere

A new method of determination of meteor flux density distribution over the celestial sphere is discussed. The flux density was derived from observations by radar together with measurements of angles of arrival of radio waves reflected from meteor trails. The role of small meteor showers over the sporadic background is shown

Discrimination between Streptococcus pneumoniae and Streptococcus mitis based on sorting of their MALDI mass spectra

AbstractAccurate species-level identification of alpha-hemolytic (viridans) streptococci (VGS) is very important for understanding their pathogenicity and virulence. However, an extremely high level of similarity between VGS within the mitis group (S. pneumoniae, S. mitis, S. oralis and S. pseudopneumoniae) often results in misidentification of these organisms. Earlier, matrix-assisted laser desorption ionization–time of flight mass spectrometry (MALDI-TOF MS) has been suggested as a tool for the rapid identification of S. pneumoniae. However, by using Biotyper 3.0 (Bruker) or Vitek MS (bioMérieux) databases, Streptococcus mitis/oralis species can be erroneously identified as S. pneumoniae. ClinProTools 2.1 software was used for the discrimination of MALDI-TOF mass spectra of 25 S. pneumoniae isolates, 34 S. mitis and three S. oralis. Phenotypical tests and multilocus gene typing schemes for the S. pneumoniae (http://spneumoniae.mlst.net/) and viridans streptococci (http://viridans.emlsa.net/) were used for the identification of isolates included in the study. The classifying model was generated based on different algorithms (Genetic Algorithm, Supervised Neural Network and QuickClassifier). In all cases, values of sensitivity and specificity were found to be equal or close to 100%, allowing discrimination of mass spectra of different species. Three peaks (6949, 9876 and 9975 m/z) were determined conferring the maximal statistical weight onto each model built. We find this approach to be promising for viridans streptococci discrimination

Structure of sporadic meteor radiant distributions from radar observations

An analysis of sporadic meteor flux distributions over the celestial sphere is given. Symmetry of the radiant distribution relative to the plane crossing the ecliptic pole and the Earth's apex and antapex was identified. © 1995 Kluwer Academic Publishers

Microswarm structure of a meteoric complex beyond an ecliptic plane

The purpose of this work is to determine maximum allowed numbers of measurements used in the discrete solution, at which probability to detect a false microshower will be rather small, and to find out how this number is connected to the solution accuracy and how it corresponds with productivity of the meteoric radar. We have advanced a quasi-thomography method in the solution of a problem of determination of meteor radiant distributions on a celestial sphere based on the data of radar goniometer measurements. We have tried to find out, how the stable structures of radiants prolated along an elongation angle from apex in the course of the year vary, how they are correlated in time and whether they will be repeated from one year to other year

Possibility of investigation of the microstreams and associations by the radiotomographic method

This article contains the tomographic problem's solution of the radiants distribution study by the meteor radar data. It was received the distribution of meteors velocities for the parts of celestial sphere with angular dimensions 10° × 10° and 1° × 1°. Was shown that the angular dimensions of most of radiants are equal 1° - 3° and larger part of the sporadic background looks like a totality of microstreams. © 1995 Kluwer Academic Publishers

Tomographic method for meteor-flux determination from radar observations

Potentialities of the tomographic method are studied as this method used to determine the density distribution of the sporadic-meteor flux over the celestial sphere from radar observations with measuring radiowave-arrival angles. It is shown that the main features of the distributions obtained by this method are the same as those obtained by other methods but that the angular resolution is much higher. © 1997 MAHK Hayka /Interperiodica Publishing

The Novelties Producing by Ozonolysis of Petroleum High-Molecular Components

Specific properties of ozonolysis products of high-molecular heteroatomic compounds (resins and asphaltenes) from crude petroleums and natural bitumens are described. It is shown that polyfunctional carboxylic acids or their salts obtaining by alkaline hydrolysis of ozonization products of heavy petroleum stocks permits to produce manifold useful novelties such as high-effective demulsifiers for petroleum dehydration process instead of expensive synthetic demulsifying reagents; water-soluble organic astringents suitable for chemical land-reclamation or to prepare moulding mixtures at the foundries; oily or emulsion lubricating coolants for metal-working tools; stimulators of soil microorganisms activity and plant growth. The new chemical products of petroleum origin are not inferior to the best synthetic reagents for the same destinations but differ from the lasts advantageously on account of the simplicity of their production technology and low cost. The optimal expenses and other principal technological parameters were established both for raw material ozonization, following alkaline treatment and final product isolation stages of the production process for each new reagent described. By means of numerous laboratory experiments and field tests performed with seeds, bulbs and grafts of different agricultural plants and with ozonolysis products produced from the resinous components of different crude petroleums it was proved that high biological activity is characteristic only of the substances obtained from high-molecular compounds from low-sulfur naphthenic crude petroleums and natural bitumens occurring, as a rule, at small burial depths. These ozonolysis products are very effective stimulants for the different plants growth, suitable for a treatment of different forms of planting materials and providing significant acceleration of early growth stages, the reduction of vegetation and ripening periods, and the increase of total productivity of agricultural plants

Associations of meteor microshowers or as the Kazan radar "SEES" radiants on northern celestial hemisphere

The discrete quasitomographic method of the analysis of the interferometric data of meteor radar gives us the possibility of measuring coordinates and velocities of very weak meteor showers with a 2 × 2 square degree resolution on the celestial sphere. The minimal rate of the meteors in each microstream is five meteors per day. At such sensitivity, basic distinctions between irregularities of the sporadic background and meteor streams vanish. More than 1000 of the detected microshowers per month are associated with a combination of (a) the large known meteor showers, (b) the weaker known meteor showers and (c) till now unknown associations of microshowers. All microshowers regardless of association have the identical velocities, limited areas of radiation and near simultaneity of their acting dates. The results are compiled as maps of radiant distribution and average velocities of microstreams for different months. From these it is possible to see how the microshower activity for various discrete sites on the celestial sphere correlate with the behavior of the well-known meteor streams and thus to infer the orbital properties of the different microstream configurations. © Springer Science+Business Media, Inc. 2005

Isoforms of Serratia marcescens nuclease. Comparative analysis of the substrate specificity

Comparative analysis of the specificity of Serratia marcescens nuclease isoforms has been carried out. Mononucleotides separated by anion-exchange chromatography with presence of 7 M urea from partially hydrolyzed RNA were identified by reversed-phase HPLC. Both enzymes were found to split phosphodiester bonds at nearly all bases in the nucleic acid chain. However nuclease Sm1 demonstrated a preferred cleavage of phosphodiester bonds near uracil and nuclease Sm2 - near guanine. A possible role of N-terminal tripeptide fragment in nucleases mechanism is discussed

Monetary Variables and Economic Activity : On the Case of Japan since the Late 1990\u27s

1990年代後半以降に採用されたゼロ金利政策と量的緩和政策は、デフレ不況克服のための政策であった。前者は、操作目標である無担保コールレート翌日物をゼロ近傍に貼り付けるという政策であり、後者は操作目標を短期金利から日銀の当座預金残高に切り替え、その増額を図るという、戦後日本の金融政策運営上において初めて採用された政策であった。本研究は、これらの政策が採用された期間を分析対象として主要な金融変数と実体経済変数間の因果関係を検証し、金融政策の効果波及メカニズムの解明を試みるものである。検証方法としては、主としてGrangerテストを用いて検証を行った。その結果、政策目標の1つでもある実体経済の動向を反映する生産への効果が認められなかったものの、金融政策の効果波及メカニズムとしてマネーチャンネルよりもむしろ銀行貸出を重視するクレジットチャンネルの重要性が確認された。研究ノー