bluuebunny/crossref_metadata_2025 huggingface dataset:
Changes in phytoplankton productivity with the introduction of heavy metals into the ecosystem and its subsequent purifi cation with a humic sorbent
Authors: Skripkina T. S. , Bychkov A. L. , Smolyakov B. S. , Lomovsky O. I.
Published: May 2019

Mesoscale modeling experiments simulating water pollution of a freshwater plain reservoir by infusion of a mixture of heavy-metal (Cd, Zn, Cu) salts were conducted. Central to the research was determining the phytoplankton response (in terms of primary production) to the presence of heavy metals in water and to the introduction of a sorbent based on mechanochemically oxidized humic acids. The removal of heavy metals by phytoplankton on the 16th day of the experiment resulted in a decrease in the content of Cd(II) to 62%, Zn(II) to 58%, and Cu(II) to 46% of the initial levels. The use of sorbent under the same conditions led to a decrease in the content of Cd(II) to 21%, Zn(II) to 27%, and Cu(II) to 10% of the initial levels. The sorbent under study does not cause blooming of the reservoir, distinguishing it from sorbents containing humic acids with the native structure of molecules.
Diffuse pollution of waterbodies and assessment of nutrient removal under diff erent land-use scenarios in a catchment area
Authors: Yasinskiy S. V. , Venitsianov E. V. , Vishnevskaya I. A.
Published: May 2019

The concept of the process of diffuse pollution of waterbodies of various dimensions is presented. The algorithm for calculating the average annual volume of removal and migration of the main nutrients—nitrogen and phosphorus—from the catchment into the ravine and river network of a small river is demonstrated. The results of simulating the characteristics of the spring runoff, soil erosion, and removal of nutrients from the catchment area into the Istra River (Russia) with hypothetical changes in its landscape structure under the influence of urbanization and reforestation are developed through a series of calculations.
The first steps in the earth aerospace remote sensing in the Institute of Geography RAS
Authors: Asoyan D. S.
Published: May 2019

Fifty years ago, in the autumn of 1968, experiments on interpretation of the first Soviet global space image made by ‘Zond-5’ automatic spacecraft and of American space images from Gemini III, IV, V piloted spacecrafts were carried out for the first time in the USSR. The aim of these experiments was the study of possibilities to use satellite images in geomorphology and geography.

The first results demonstrated high value of space images for geomorphological research for the studies of morphostructures and morphosculptures of various genesis, the discovery of a 2500 km long lineament in Sahara; real time-related transitive borders of latitudinal landscape zones in Africa were indicated for the first time. It was suggested that satellite images could be applied for the studies of various geological structures, seismicity, volcanic activity, global and regional zones of jointing as well as for thematic mapping. Thanks to these studies a new Department of Satellite-related Geography was established at the Institute of Geography of the USSR Academy of Sciences. Later on, studies were carried out at the Institute’s Department of Satellite-related Geography in order to find application possibilities of TV multispectral scanned and photographic satellite images for thematic research and mapping. The first conclusions were confirmed in the course of further studies in the field of aerospace remote sensing in Russia and abroad; their results were summarized in two fundamental atlases published under the auspices of the Institute of Geography of the Russian Academy of Sciences (IGRAS): “Resources and Environment World Atlas” (1998) and “World Atlas of Snow and Ice Resources” (1997). Up to date, methods of aerospace remote sensing continue to be applied successfully at IGRAS for geomorphological studies and for resolving of environmental problems in physical and human geography.
Geomorphological approach to the river runoff evaluation in the geological past (рaper 5. Comparison of the estimates by different methods)
Authors: Sidorchuk A. Yu. , Panin A. V. , Borisova O. K.
Published: May 2019

The estimates of water flow in the paleorivers with known paleochannel morphometry was compared with basic hydrological and climatic indicators found by paleogeographic analogy in the regions-analogues, determined by fossil flora analysis from the Holocene (from the present to 10 thousand years ago), the Late Valday (17–18 thousand years ago) and before the Eemian (~140 thousand years ago) deposits. Comparison of annual runoff depth obtained by regime equations and equations of hydraulics and taken from the hydrological maps in the regions-analogues, showed quite satisfactory compliance. Relative error of comparison for the different objects is in the range of ±11–23%, which does not exceed the average error of water flow estimation by each of these techniques separately. However, the error of ±20% is significant and geomorphological approaches can be applied only for the cases of sufficient changes in the water flow of ancient rivers (twice or more) and for long-term periods. Nevertheless, the use of geomorphological approaches and the method of paleogeographic analogy is now one of the main ways to reconstruct water resources in the past and to construct water resources scenarios for possible future climate changes.
The impact of recreation on linear erosion in the Olkhon region
Authors: Karavaev V. A. , Opekunova M. Yu. , Solodyankina S. V. , Znamenskaya T. I. , Vanteeva Yu. V.
Published: May 2019

In the last decade, a significant activation of water erosion was detected in the Priol’khonie (Lake Baikal). The comparison of satellite and aerial images of 1982–1986 and 2016 years shows that the length and density of the dirt road network have increased by 12.8 times during the period of 35 years. Recreational development, unsystematic laying, and exploitation of dirt roads led to the significant increase of linear erosion and the formation of numerous erosion forms. Linear erosion develops in most cases along roads laid along the thalwegs of the ravine network. Weak substrate and sparse vegetation (sparseness is aggravated by intensive grazing) predetermine rapid development of water erosion. Thus, in most cases, the increase of the erosion network is caused by anthropogenic impact. The development of forms of linear erosion leads to the disturbance of the integrity of modern landscapes of the Olkhon region, which significantly reduces their stability and recreational potential.
Аnticholinesterase and antioxidant activity of new binary conjugates of (с)-carbolines
Authors: Makhaeva G. F. , Shevtsova E. F. , Boltneva N. P. , Kovaleva N. V. , Rudakova E. V. , Dubova L. G. , Shevtsov P. N. , Bachurin S. O.
Published: May 2019

This study presents the synthesis of binary tetrohydro-γ-carbolines with ditriazol spacers of varying length, which exhibit anticholinesterase and antioxidant activity, as compared to the original Dimebon prototype. Anticholinesterase activity suggests the potential ability of the new compounds to block β-amyloid aggregation induced by anticholinesterase, making them promising candidates for further research preparations for the treatment of Alzheimer's disease. Particular attention should be paid to the conjugate with an intertriazol hexamethylene spacer, which can be regarded as the leading compound in this series.
Recombinant production and structure-function study of ts1 toxin from the Brazilian scorpion Tityus serrulatus
Authors: Shenkarev Z. O. , Shulepko M. A. , Peigneur S. , Myshkin M. Yu. , Berkut A. A. , Vassilevski A. A. , Tytgat J. , Lyukmanova E. N. , Kirpichnikov M. P.
Published: May 2019

This work introduces an effective bacterial system for the production of β-toxin Ts1, the main component of the Brazilian scorpion Tityus serrulatus venom. Recombinant toxin and its 15N-labeled analogue are obtained by direct expression of the synthetic gene in Escherichia coli, with subsequent folding from the inclusion bodies. NMR spectroscopy data assert that the recombinant toxin is structured in aqueous solution and is composed of a significant fraction of β-structure. Moreover, the formation of a stable Ts1 disulfide-bond isomer of a disordered structure is observed during folding; recombinant Ts1 blocks Na+ current through NaV1.5 channels, without affecting the processes of activation and inactivation. Simultaneously, the effect upon NaV1.4 channels is associated with a shift of the activation curve toward the more negative membrane potentials.
Effect of taste receptor protein T1R3 on the development of islet tissue of the murine pancreas
Authors: Murovets V. O. , Sozontov E. A. , Zachepilo T. G.
Published: May 2019

Protein T1R3, the main subunit of sweet, as well as amino acid, taste receptor, is expressed in the epithelium of the tongue and gastro intestinal tract, in β–cells of the pancreas, hypothalamus, and numerous other organs. Recently, convincing witnesses of T1R3 involvement in control of carbohydrate and lipid metabolism, and control of production of incretines and insulin, have been determined. In the study on Tas1r3-gene knockout mouse strain and parent strain C57Bl/6J as control, priority data concerning the effect of T1R3 on the morphological characteristics of Langerhans islets in the pancreas, are obtained. In Tas1r3 knockout animals, it is found that the size of the islets and their density in pancreatic tissue are reduced, as compared to the parent strain. Additionally, a decrease of expression of active caspase-3 in islets of gene-knockouts is demonstrated. The obtained data show that the lack of a functional, gene encoding sweet-taste receptor protein causes a dystrophy of the islet tissue and associates to the development of pathological changes in the pancreas specific to type-2 diabetes and obesity in humans.
Spectral properties of ordinary differential operators with involuton
Authors: Vladykina V. E. , Shkalikov A. A.
Published: May 2019

Let P and Q be ordinary differential operators of order n and m generated by s = max{n; m} boundary conditions on a nite interval [a; b]. We study operators of the form L = JP + Q, where J is the involution operator in the space L2[a; b]. We consider three cases n > m, n < m, and n = m, for which we dene concepts of regular, almost regular, and normal boundary conditions. We announce theorems on unconditional basis and completeness of the root functions of operator L depending on the type of boundary conditions from selected classes.
Detection of endogenous phthalates in bacterial pathogens of plants and animals
Authors: Shafikova T. N. , Оmelichkina U. V. , Boyarkina S. V. , Еnikeev А. G. , Мaksimova L. А. , Semenov А. А.
Published: May 2019

The endogenous esters of ortho-phthalic acid, dibutil phthalate (DBP) and di-(2-ethylhexil)-o-phthalate (DEHP), have been first detected in bacterial pathogens of plants (Clavibacter michiganensis ssp. sepedonicus, Pectobacterium carotovorum ssp. carotovorum, Rhizobium rhizogenes, Rhizobium radiobacter) and animals (Escherichia coli).
Morphologic, chemical, and spectral analyses of combustion products of micro- and nano-dispersed particles of aluminium borides
Authors: Yagodnikov D. A. , Guseinov Sh. L. , Storozhenko P. A. , Shpara A. P. , Sukhov A. V. , Fedorov S. G.
Published: May 2019

This study presents the findings of an investigation of flame propagation in air suspension of nanodispersed polyboride particles, and provides spectral, morphological, and mass-spectrometric analyses of condensed combustion products generated during an air suspension combustion.
Formation of surface layer of hydrogen in pure aluminum
Authors: Indejtsev D. A. , Osipova E. V.
Published: May 2019

Hydrogen atom behavior in pure aluminum is described by ab initio modelling. All main energy characteristics of the system consisting of hydrogen atoms in a periodic aluminum crystal are found.
Shock wave as possible mechanism for the generation of abnormally high accelerations during the M = 9.0 Tohoku earthquake on march 11, 2011
Authors: Pavlenko O. V.
Published: May 2019

This study proposes a mechanism for the generation of anomalously high accelerations (over 1g, maximum up to approximately 3g) recorded during the 2011 Tōhoku earthquake (Mw = 9.0). Soil behavior in the fault zones of the earthquake is examined based on the records of vertical groups, and the earthquakes “atypical” model is determined: shear moduli increased during strong motions, which are indicative of soil strengthening, and then decreased. That which can be explained by an assumption of soils being subjected to some additional impact. Accelerogram curves show a decrease in the duration and an increase in the intensity of strong motions with distance from the earthquake source, which may be indicative of superposition of seismic waves and generation of shock waves by a rapidly moving source — the tip of the fracture in the earthquake source.
Russian hydropower under the global climate change
Authors: Klimenko V. V. , Fedotova E. V.
Published: May 2019

The influence of the climate change in Russia on the operation of hydroelectric power plants during the 21st century is considered. For obtaining quantitative assessments, the results yielded by global climatic models for river runoff were subjected to ensemble averaging. In addition to the standard RCP climatic scenarios, the MPEI scenario is considered, the fundamental distinctive feature of which is that the most likely development trajectories are selected. It is found that the choice of a scenario has an essential effect on both the qualitative pattern of river runoff changes over the territory and on the quantitative characteristics of this process.An integral assessment for the change in the hydroelectric power plant outputs due to climate change is made.
Optimum trajectories for an Earth–asteroid–Earth mission with a high thrust flight
Authors: Ivashkin V. V. , Lang Anqi
Published: May 2019

The trajectories of a mission to an asteroid with the presence of a spacecraft (SC) near the asteroid for some time and including a return to the Earth have been studied. A two-stage method of constructing optimum (with respect to the maximum of the useful SC mass) interplanetary trajectories of an Earth–asteroid–Earth mission with high thrust engines has been developed: in the central Newtonian field of the Sun’s attraction at the first stage and with allowance for disturbances at the second stage. An algorithm of constructing conjugate functions for the case of maximizing the useful mass has been designed. The optimum trajectories for the Earth-Apophis-Earth mission have been constructed and analyzed. The possibility in principle of organizing the Earth-Apophis-Earth space mission based on the "Soyuz" and "Zenit" launch vehicles and "Fregat" upper stage for a flight has been demonstrated.
The effect of initial temperature on the modes of passivation of pyrophoric na-nopowder (macrokinetic approach)
Authors: Seplyarskii B. S. , Rubtsov N. M. , Ivleva T. P. , Alymov M. I.
Published: May 2019

In the work, thermal modes of passivation of pyrophoric nanopowders at lower initial temperatures of the layer of the nanopowder are studied with analytical and numerical methods in the context of a macrokinetic approach. It is shown that the decrease in the initial temperature of the layer leads to a transition from a layer-by-layer mode of passivation to the volume one. That allows controlling the acceptable level of a warming up at passivation even at the high concentration of oxidizer in gas. Analytical expressions for delimitation of the layer-by-layer and volume passivation modes are obtained; these are confirmed by the results of numerical calculations.
Geodynamics of carbonatites from the paleoreconstraction
Authors: Kogarko L. N. , Veselovskiy R. V.
Published: May 2019

Carbonatite are of a great economic importance because this rocks contain valuable rare metals. At present tree models of geodynamic regime of carbonatites formation are actively develop. 1- the generation of carbonatite melts within the lithospheric mantle, 2- the close connection of carbonatites with the zones of orogenesis, 3- a large group of carbonatites links to deepseated mantle plumes. For the first time using the modern model of “absolute” paleotectonic reconstructions and large database was showed the general connection of Phanerozoic carbonatites to the large areas of low velocities of S‑waves located in the lower mantle — zones of the generation of deep mantle plumes.
Pogor’uy formation of the proterozoic, Yenisey Ridge: age and provenance according to U–Pb-isotopic detrital zircon dating
Authors: Priyatkina N. S. , Kuznetsov N. B. , Rud`ko S. V. , Shatsillo A. V. , Khudoley A. K. , Romanyuk T. V. , Maslov A. V.
Published: May 2019

The results of U–Pb-isotopic dating of detrital zircons from sandstones of the Proterozoic Pogor`uy Fm. from the northern and southern parts of the Eastern-Angara block of the Yenisei Ridge are presented. The sandstones of the northern part of the Eastern-Angara block are dominated by the Archean and Paleoproterozoic populations of detrital zircons, while in the samples from the southern part of the Eastern-Angara block up to 25% of the Mesoproterozoic age grains have been fixed. The dates of detrital zircons allow us to constrain the maximum sedimentary age of the Pogor`uy Fm. and the entire interval of its formation as 1.2–0.9 Ga. The paleogeographic features of the formation of the Pogor`uy Fm. in the context of existing views on a location of Siberia within the Rodinia supercontinent are considered.
The main features of lithium metallogeny in geological time
Authors: Tkachev А. V. , Rundqvist D. V. , Vishnevskaya N. A.
Published: May 2019

This paper reports on lithium metallogeny in geological time. The geochronological analysis was conducted on the basis of data on 71 lithium deposits distributed globally. These deposits contain almost all Li resources, which are industrially significant and of potential interest in terms of the economy. It was established that these deposits were formed in different geological epochs, from the Late Mesoarchean to the Holocene. The distribution of their resources on the scale of geological time is distinctly discrete. In the Kenoran, Columbian, and Rodinian supercontinent cycles, only pegmatite deposits of lithium were formed. In the Pangean cycle, the main resources are also attributed to pegmatite deposits, but some of them are concentrated in lithium–fluorine rare-metal granites. In the incomplete Amasian cycle, salars of geodynamically active areas play a main role in the resource base; the epithermal stratiform deposits, pegmatites, and lithium fluorine-granites are of much less significance.
The role of organic matter in formation of the properties of a shale deposit
Authors: Юсупова И. Ф.
Published: May 2019

Baltic oil shales — kukersites were studied as an example of rocks with rock-forming organic matter (OM). The volumetric significance of their OM is shown (due to the low density) in the volume and thickness of the shale layers. A higher OM content is responsible for a lower strength of the shales relative to the carbonate rocks of the deposit. The variable OM contents and other heterogeneities of the shale layers (structure, nodules, etc.) are factors of the mosaic distribution of areas with different density–strength properties and, as a result, of uneven reduction of layers and their deformation in the case of OM loss (full or partial). It is concluded that the intercalation of kukersite and limestone layers leads to density and strength anisotropy of the shale deposit. Episodic loss of OM and carbonates by the shales is considered for the local areas of the deposit: here, kukersites contain only a terrigenous component with clasts of limestones, shales, and epigenetic sulfides. The loss of OM is explained by sulfate-reduction processes in the underground hydrosphere.
On optimal bounds in the local semicircle law under four moment condition
Authors: Götze F. , Naumov A. A. , Tikhomirov A. N.
Published: May 2019

We consider symmetric random matrices with independent mean zero and unit variance entries in the upper triangular part. Assuming that the distributions of matrix entries have finite moment of order four, we prove optimal bounds for the distance between the Stieltjes transforms of the empirical spectral distribution function and the semicircle law. Application concerning the convergence rate in probability of the empirical spectral distribution to the semicircle law is discussed as well.
On determination of the permittivity through the module of the vector of the electric strength of the high-frequency electromagnetic field
Authors: Romanov V. G.
Published: May 2019

For nonmagnetic and nonconductive medium the system of electrodynamic equations that corresponds to periodic in time oscillations is considered. An inverse problem of determining permittivity in this system by the given module of the electric strength is studied. It is supposed that the electric fields is a result of the interference of two fields created by point sources. The permittivity e(x) is assumed to be differ from a given positive constant e0 inside of a compact domain W0 Ì R3 only. An information on module of the electric strength is given on the boundary of the domain W contained W0 inside itself and for all frequencies beginning with some fixed frequency w0. The asymptotic behavior of solution of a direct problem related to the electrodynamic equations is studied and the original inverse problem is reduced to the well known inverse kinematic problem. This reduction open a way for constructive solution of the inverse phaseless problem.
Laser photoacoustic evaluaion of residual stresses in metal plates with a hole
Authors: Glazov A. L. , Morozov N. F. , Muratikov K. L.
Published: May 2019

The nature of the change in the photoacoustic signal around the hole in samples of duralumin is studied. A com- parison of the experimental results with the solution of the classical problem for stress distribution around a circular hole in a prestressed plate is made. A good correspondence between the behavior of the photoacoustic signal with piezoelectric recording and the distribution of stresses around the hole is demonstrated. The possibility of estimating the internal stresses by the photoacoustic method in combination with the hole drilling method is shown.
Electroreduction of the bromate anion on a microlectrode in excess acid: solution of the inverse kinetic problem
Authors: Goncharova O. A. , Glazkov A. T. , Lizgina K. V. , Piryazev A. A. , Koryakin S. L. , Konev D. V. , Vorotyntsev M. A. , Mintsev V. B.
Published: May 2019

Acidic aqueous solutions of bromic acid salts (bromates) are promising electrolytes for redox flow batteries due to their record high power capacity and the rate of electrode reactions proceeding in the autocatalytic regime. The paper gives a comparison of the results of mathematical modeling and experimental measurements of steady state currents of bromate anion electroreduction in sulfuric acid medium on microelectrodes of various radii. An algorithm of solving the inverse problem suitable for determination of the key transport and kinetic process parameters was proposed and tested.
Computer multi-agent model of chemico-physiological processes in the human gastrointestinal tract as a living biochemical system
Authors: Meshalkin V. P. , Ivashkin Yu. A. , Nikitina M. A.
Published: May 2019

A methodology was proposed to develop an original computer-aided multiagent model of chemicophysiological processes in the human gastrointestinal tract (GIT) as a complex living biochemical system (LBCS), which simulates chemicophysiological processes of interaction of biologically active parts and organs of GIT in models of intelligent organoid agents. The model vividly represents chemicophysiological processes of the complex LBCS as a whole and also predicts its viability and homeostasis in cases of various physiological and biochemical external actions, internal abnormalities, and malfunctioning of GIT organs.
Identification and expression analysis of chitinase genes in pitchers of Nepenthes sp. during development
Authors: Filyushin M. A. , Kochieva E. Z. , Shchennikova A. V. , Beletsky A. V. , Mardanov A. V. , Ravin N. V. , Skryabin K. G.
Published: May 2019

Fifteen chitinases of classes I–V were identified in the transcriptomes of pitchers and adult leaves of the carnivorous plant Nepenthes sp. Ten of these chitinases were identified for the first time, including the chitinases of classes II and V. The expression levels of all found chitinase genes in leaves and at three stages of pitcher development were determined. The maximum level of transcriptional activity in an open pitcher was observed for the genes encoding chitinase NChi4 (class II) and its isoforms. The expression levels of these genes significantly increased as the pitcher developed. In addition, for the first time, transcription of the genes encoding chitinases of all five classes was detected in the leaves of this plant.
Hypochlorite-induced oxidative modification of fibrinogen
Authors: Yurina L. V. , Vasilyeva A. D. , Bugrova A. E. , Indeykina M. I. , Kononikhin A. S. , Nikolaev E. N. , Rosenfeld M. A.
Published: May 2019

Oxidation of fibrinogen with hypochlorite inhibited the fibrin network self-assembly even at the lowest concentration of the oxidant. The analysis of the results of protein electrophoresis at this hypochlorite concentration showed the absence of fragmentation of the protein and covalent cross-linking of its chains. The study of the areas responsible for the conversion of fibrinogen into fibrin by mass spectrometry showed that they are not subject to oxidative damage. However, we identified oxidized amino acid residues, which could affect the protofibril aggregation.
Serotonin differentially modulates the functional properties of damaged and intact motoneurons of the frog spinal cord
Authors: Kalinina N. I. , Zaitsev A. V. , Vesselkin N. P.
Published: May 2019

The role of serotonin in the recovery of motor functions in spinal cord injuries is intensively studied, but the mechanism of its action remains unclear. In this work, we used the preparation of an isolated segment of the spinal cord of an adult frog to compare the electrophysiological properties of damaged and intact lumbar moto- neurons and the modulating effect of serotonin (5-HT) on them. Due to specific morphology of the motoneurons (a very branched dendritic tree), we could reliably obtain damaged (on the surface of the slice) and intact moto- neurons (in the depth of the slice). Using intracellular recording, we found significant differences between these groups of neurons in the resting membrane potential, input resistance, properties of the action potential (amplitude, duration, fast and medium phases of the afterhyperpolarization), the frequency of spikes. We found that 5-HT reduced the amplitude of the afterhyperpolarization and increased the frequency of spikes in intact neurons, whereas in damaged motoneurons, 5-HT increased the amplitude of the afterhyperpolarization and did not affect the frequency of discharges. The results of the study show that the properties of the motoneurons and the effect of neuromodulators on them, in particular, 5-HT, can change after damage.
Disorder indicator for nonstationary stochastic processes
Authors: Kislitsyn А. A. , Kozlova A. B. , Korsakova M. B. , Orlov Yu. N.
Published: May 2019

The properties of a statistic called a self-consistent stationarity level of nonstationary time series are examined in this work. It is shown that a change in this statistic can be treated as a disorder in the nonstationarity properties of the series. The significance level of decision making is estimated, characteristic periods in a non-stationary stochastic process are detected, and an optimal sample size for constructing indicators in stochastic control problems is determined. A disorder indicator for electroencephalogram data from epilepsy patients is studied as a practical application.
Spectral deformation in a problem of singular perturbation theory
Authors: Stepin S. A. , Fufaev V. V.
Published: May 2019

Quasi-classical asymptotic behavior of the spectrum of a non-self-adjoint Sturm–Liouville problem is studied in the case of a one-parameter family of potentials being third-degree polynomials. For this problem, the phase-integral method is used to derive quantization conditions characterizing the asymptotic distribution of the eigenvalues and their concentration near edges of the limit spectral complex. Topologically different types of limit configurations are described, and critical values of the deformation parameter corresponding to type changes are specified.
Generalization of Kravchenko—Kotelnikov theorem by spectra of compactly supported infinitely differentiable functions
Authors: Budunova K. A. , Kravchenko V. F. , Pustovoit V. I.
Published: May 2019

New generalization of Kravchenko–Kotelnikov theorem by spectra of compactly supported infinitely differentiable functions is discussed. These functions are solutions of linear integral equations of special form. The spectrum of is a multiple infinite product of the spectra of atomic functions. dilated by the argument. Constructed generalized series has fast convergence. This property is confirmed by the presented truncation error bound formula and the results of a numerical experiment.
Age and sources of the Lower Mesozoic metasedimentary rocks of the Un'ja-Bom terrane in the Mongol-Okhotsk fold belt: results of the U–Th–Pb geohronological (LA–ICP–MS) AND Sm–Nd isotope studies
Authors: Zaika V. A. , Sorokin A. A. , Kovach V. P. , Sorokin A. P. , Kotov A. B.
Published: May 2019

The results of the U—Th—Pb geochronological studies indicate that in the Un’ja-Bom terrane the youngest peaks on the relative probability curves of ages are 207 and 212 Ma for zircons from the metasiltstone of the Kurnal formation and from the metasiltstone of the Amkan formation. Similar age estimates for the youngest peaks were obtained for the detrital zircons from the metasedimentary rocks of the Tukuringra terrain of the eastern part of the Mongol-Okhotsk belt, which indicates that the Lower Mesozoic flyschoid complexes in the structure of this belt are developed much wider than is currently believed. The results obtained in our U—Th—Pb geochronological and Sm—Nd isotope geochemical studies suggest’s that the sedimentary rocks material was carried to the sedimentation basin mainly from the continental massifs of the Amur superterrane.
A new compound of the (K,Na)3Ca8Si6[Si4O12]3 charoite substrate
Authors: Kashaev A. A. , Ivanova L. A. , Medvedev V. Ja. , Uschapovskaya Z. F.
Published: May 2019

As a result of experimental studies on the interaction between a charoite substrate and host lamprophyres of microcline-arfvedsonitic composition, a new (K,Na)3Ca8Si6[Si4O12]3 compound has been obtained with a new type of radical Si2[Si4O12] found in its crystalline structure а = 15.2613 (3) Å, I2/13, Z = 4. The chain-shaped Ca-octahedra connected through common faces encircle a radical and close in a K-octagon. In contrast to charoite with banded-tube radicals, an isometrically-island silicon radical is identified.
Features of the distribution of abnormal gas geochemical fields in the Red River rift (Gulf of Tonkin, South China Sea)
Authors: Shakirov R. B. , Hung Duong Quoc , Syrbu N. S. , Anh Le Duc , Obzhirov A. I. , Borzova O. V. , Okulov A. K. , Nam Bui Van , Diep Nguyen Van , Dong Mai Duc , Legkodimov A. A. , Shakirova M. V. , Ponomareva A. L. , Bakunina M. S.
Published: May 2019

This paper reports the results of the third Russian–Vietnamese expedition (POI FEB RAS and the Institute of Marine Geology and Geophysics, Vietnam Academy of Science and Technology) in the Gulf of Tonkin, South China Sea (April 2016) and field work outcomes from 2016-2017. The studies revealed new specific features of the distribution and origin of gas-geochemical fields in sediments within the rift zone of the Red River along a 150-km profile. Four zones with high amplitude anomalies of hydrocarbon gases, helium, hydrogen, carbon dioxide, and carbon monoxide were revealed. The distribution of the anomalies reflects the tectonic structure of the area and points to the presence of several lithospheric sources of gases including gases of deep origin. The studies were carried out within the scope of the Joint Vietnamese–Russian Laboratory for Marine Geosciences (POI FEB RAS and the Institute of Marine Geology and Geophysics, Vietnam Academy of Science and Technology). The article is dedicated to the year of friendship between Russia and Vietnam.
The new plant expression system for the development of vaccines against papillomaviruses
Authors: Salyaev R. K. , Rekoslavskaya N. I. , Stolbikov A. S.
Published: May 2019

To enhance the synthesis of the main antigenic coat proteins L1 of high risk oncogenic papillomaviruses types HPV16, HPV18, HPV31 and HPV45, the sequence of the gene encoding the cucumber mosaic virus replicase (RdRP CMV) was inserted into the genetic construct. This inclusion has made possible to increase highly the production of these antigenic proteins to 25—27 µg per 1 mg of total soluble protein of transformed tomato fruit.
Gene dunce localization in the polytene chromosome of Drosophila melanogaster long span batch of adjacent chromosomal structures
Authors: Khoroshko V. A. , Pokholkova G. V. , Zykova T. Yu. , Osadchiy I. S. , Zhimulev I. F.
Published: May 2019

The molecular and chromosomal localization of the dunce gene was studied. This gene (167.3 kb) consists almost entirely of introns, in which a cluster of seven short tissue-specific genes is located. On the basis of the results of FISH analysis of the gene fragments, we established that the dunce gene is located within nine chromosomal structures (four bands and five interbands), which contradicts the common idea that genes are located in only one structure (band or interband) or at the boundary of these structures. Our results are quite unexpected and original and greatly expand the current understanding of the genetic organization of interphase chromosomes.
A construction of reflecting Lévy processes
Authors: Ibragimov I. A. , Smorodina N. V. , Faddeev M. M.
Published: May 2019

For some classes of Lévy Processes, the notion of reflection from an interval boundary is introduced. It is shown that trajectories of a reflecting process define random operator that map functions defined on the interval boundaries into elements of L2 on the whole interval.
Local metric properties of level surfaces on Carnot–Caratheodory spaces
Authors: Karmanova M. B.
Published: May 2019

For level sets of -mappings of Carnot manifolds to Carnot–Caratheodory spaces, we introduce an adequate local metric characteristic. Moreover, for mappings defined on Carnot groups, we construct a special adapted basis in the preimage such that it assigns a suitable local sub-Riemannian structure on a complement of a kernel of a sub-Riemannian differential to the initial sub-Riemannian structure in the image.
Kumystin granosyenites complex of the late Cryogenian in Bolshoi Karatau (South Kazakhstan), age substantiation
Authors: Degtyarev K. E. , Tretyakov A. A. , Salnikova E. B. , Kotov A. B.
Published: May 2019

The results of U–Pb geochronological studies of quartz syenites of the Kumystin complex of the Bolshoi Karatau ridge in southern Kazakhstan are presented and their late Neoproterozoic (717 ± 4 Ma) age is substantiated. Kumystin syenites complex together with rhyolites and basalts of the Kainar Formation are the youngest formations taking part in the basement of Karatau-Dzhebagly precambrian massif and formed in the second half of Cryogenian. The data set about the ages of the youngest complexes taking part in the basement of precambrian massifs of the Western part of the Central Asian belt indicates that the ending of magmatic activity within various massifs occurred asynchronously during the Neoproterozoic.
Early Jurassic magmatism of the Kobyuminsky system of grabens (Verkhoyansk frame of the Siberian platform) and its geodynamic nature
Authors: Kiselev A. I. , Yarmolyuk V. V.
Published: May 2019

The Kobyuminsky system of grabens was formed in the Early Jurassic within the Verkhoyansk passive margin of the Siberian platform. The volcanic complex of grabens is represented by basalts with elevated TiO2 contents (> 1.8 wt%). According to geochemical characteristics, the rocks of the volcanic series occupy an intermediate position between the basalts of the oceanic islands (OIB) and the basalt-rich mid-oceanic ridges (E-MORB). The data obtained led to the conclusion that the Kobuminsky system of grabens within the passive margin of the Siberian continent arose in connection with the activity of a small mantle plume.
Sigma-1 receptor antagonists haloperidol and chlorpromazine modulate the effect of glutoxim on NA+ transport in frog skin
Authors: Krutetskaya Z. I. , Melnitskaya A. V. , Antonov V. G. , Nozdrachev A. D.
Published: May 2019

Using voltage-clamp technique, the involvement of sigma-1 receptors in immunomodulatory drug glutoxim regulation of Na+ transport in frog skin was investigated. We have shown for the first time that preincubation of the frog skin with sigma-1 receptor antagonists – haloperidol or chlorpromazine – attenuates the stimulatory effect of glutoxim on Na+ transport. The results suggest the possible involvement of the sigma-1 receptors in glutoxim effect on Na+transport in frog skin epithelium.
Molecular dynamics of water clusters and interaction potentials
Authors: Belega E. D. , Trubnikov D. N.
Published: May 2019

The molecular dynamics method was used to analyze the dynamic characteristics of water clusters in the solid and liquid phase. A criterion is proposed for choosing the interaction potential, which is based on the distributions of the potential energy of cluster molecules in different phases. The connection of the obtained distributions with the dynamics and structure of the hydrogen bonds’ net of the cluster is shown.
Reconstruction of three-dimensional maps based on closed-form solutions of the variational problem of multisensor data registration
Authors: Vokhmintcev A. V. , Melnikov A. V. , Mironov K. V. , Burlutskiy V. V.
Published: May 2019

A closed-form solution is proposed for the problem of minimizing a functional consisting of two terms measuring mean-square distances for visually associated characteristic points on an image and meansquare distances for point clouds in terms of a point-to-plane metric. An accurate method for reconstructing three-dimensional dynamic environment is presented, and the properties of closed-form solutions are described. The proposed approach improves the accuracy and convergence of reconstruction methods for complex and large-scale scenes.
New photochromic salt spiropyrans of indoline series
Authors: Pugachev A. D. , Lukyanova M. B. , Tkachev V. V. , Lukyanov B. S. , Makarova N. I. , Shilov G. V. , Rostovtseva I. A. , Lapshina L. S. , Minkin V. I. , Aldoshin S. M.
Published: May 2019

The synthesis and study of the structure and photochromic properties of the new salt spiropyrans of the indoline series containing chlorine and bromine atoms as a substituent at the 6' position in 2H-chromene moiety are presented. The structure of the obtained compounds was confirmed by NMR 1H spectroscopy and X-ray diffraction analysis. The compounds are photochromic; the long-wavelength maximum of the absorption band of their open photoinduced form has a significant hypsochromic shift, and the lifetime substantially increases in comparison with the fluorine analog.
Production of hollow ceramic rods by SHS extrusion
Authors: Chizhikov А. P. , Stolin A. M. , Bazhin P. M. , Alymov M. I.
Published: May 2019

The possibility of producing hollow ceramic rods from an Al2O3-based material by SHS extrusion was first shown. A mechanism of formation of such rods by die swell was proposed. It was demonstrated that, at high temperatures, the material can have viscoelastic properties. The studies were performed in the system 2B2O3-6Al-2Cr2O3, in which a ceramic material based on aluminum and chromium oxides with strengthening chromium boride particles forms by self-propagating high temperature synthesis and redox reactions.
Nanostructured ZrO2-Y2O3-based systems for perovskite solar cells
Authors: Vildanova M. F. , Nikolskaia A. B. , Kozlov S. S. , Karyagina O. K. , Larina L. L. , Shevaleevskiy O. I. , Almjasheva O. V. , Gusarov V. V.
Published: May 2019

ZrO2–Y2O3 nanostructured systems with different yttria content (Y2O3 = 0, 3 and 10 mol.%) were synthesized under hydrothermal conditions and their structural, optical and electronic properties were investigated. Using ZrO2–Y2O3 systems the electron-conductive thin-film photoelectrodes were fabricated and used to develop the perovskite solar cells (PSCs) with the device configuration glass/FTO/ZrO2-Y2O3/CH3NH3PbI3/spiro-MeOTAD/ Au. The comparative studies of the PSCs photovoltaic parameters revealed that under 1000 W/m2 (AM1.5G) illumination solar cells with ZrO2–Y2O3 photoelectrodes demonstrated considerably higher power conversion efficiency in comparison with PSCs based on the undoped ZrO2 photoelectrodes.
Rare Th-Sc minerals in picrites of the Southern Urals and their genetic value
Authors: Kovalev S. G. , Puchkov V. N. , Kovalev S. S. , Vysotsky S. I.
Published: May 2019

The first data on the discovery of Th-Sc mineralization in the pyritic complexes of the Southern Urals are presented. The minerals of Th (thorite) and Sc-containing thorium minerals are described. The conclusion is made that the Th-Sc mineralization formed due to crystallization of a residual melt in the local volume.
The relationship between global volcanic activity and variations in the velocity of Earth's rotation
Authors: Levin B. W. , Sasorova E. V. , Gurianov V. B. , Yarmolyuk V. V.
Published: May 2019

Analysis of observations of the Earth's rotational velocity and volcanic activity of the planet from 1720 until 2015 suggests that higher volcanic activity temporally coincided with periods of decreased angular velocity of Earth's rotation (deceleration), and, vice versa, lower volcanic activity coincided with the periods of increased velocity of the Earth's rotation (acceleration). Our analysis employed the data from the catalog by the Smithsonian Institute, United States, in which each volcanic explosion had its own determined value of the Volcanic Explosivity Index (VEI). The total number of selected intensive eruptions with VEI > 4 was 160, including 25 eruptions with VEI > 5. At present (beginning from 2006), the Earth was entry in a deceleration phase and series of catastrophic eruptions reveals the tendency toward intensifying volcanic activity.
Optimization of heterological expression of insulin receptor-related receptor ectodomain
Authors: Mozhaev A. A. , Orsa A. N. , Deyev I. E. , Shvets V. I. , Petrenko A. G.
Published: May 2019

In this paper, we present an approach to optimize the heterologous expression of the receptor tyrosine kinase IRR, which further simplifies the purification of the IRR from the medium and increases the final yield. The approach proposed by us can find application in the biotechnological production of other large-scale recombinant proteins produced for medical purposes.
A comparative analysis of the interaction regimes of two drops and their large population in an aerosol cloud
Authors: Vysokomornaya O. V. , Rebrov A. K. , Strizhak P. A. , Shlegel N. E.
Published: May 2019

A comparative analysis of experimental results obtained by different researchers using two different experimental approaches is presented: phenomenological (registration of conditions, characteristics and modes of interaction between a drop of a shell and a target drop) and statistical (analysis of collisions of tens and even hundreds of drops of liquids as part of an aerosol). The ranges of Weber criterion values (the basic parameter used for analyzing the effects of collisions of droplets in a gaseous medium) are established, corresponding to bounce, coalescence, reflexive and stretching separation, disruption, according to the results of all considered experimental research. The bounce of droplets upon collision can be observed under the conditions We = 0.35–0.5; the probability of droplet coalescence is maximum in the range We = 1–7.5; it is possible to reliably predict spreading at We = 15–50; splitting of droplets most often occurs at values We > 50. The probability of occurrence of other scenarios in the selected We ranges is not zero. The conclusion about the need to combine experimental techniques to obtain the most reliable data and their further use in the development of prognostic models is formulated.
Soil parameters for quantitative estimation of late holocene climate changes in the southern East European Plain
Authors: Alekseev A. O. , Kalinin P. I. , Alekseeva T. V. , Mitenko G. V.
Published: May 2019

The results of studies of the regularities of evolution of soils and the environment in the steppe zone of the East European Plain are presented. Different culture-based chronological stages for the Bronze Age, Iron Age, and Middle Ages (3rd millennium BC-2nd millennium AD) are considered on the basis of buried soils at archeological monuments (burial mounds).
Estimation of seasonal and inter-annual variations of phytoplankton in the Black Sea on the base of remote sensed data procession and chlorophyll a in situ measurements
Authors: Vostokov S. V. , Lobkovskiy L. I. , Vostokova A. S. , Solov'ev D. M.
Published: May 2019

The patterns of the seasonal and inter annual variability in the development of phytoplankton, including coc- colithophores, were studied in the northeastern part of the Black Sea in various seasons. The research was carried out on the base of remote sensed data provided by the Modis Aqua ocean color scanner and long-term ship observations. The results indicate that, in the coastal and open waters of the Black Sea, the development of phytoplankton reaches the highest level in the fall-winter and winter-spring seasons, i.e., in the periods of active winter convection. It was noted that there is a relationship between the level of coccolithophore development in the summer period and the minimal temperature of the sea surface layer in the preceding winter. The most active coccolithophore blooms, were observed after the coldest winters. Unusual winter and early spring coccolithophore blooms taking place in mild hydro meteorological conditions were registered in the Black Sea, on the base of satellite data and were confirmed by in situ measurements.
Optimal feedback control problem for Bingham media motion with periodic boundary conditions
Authors: Zvyagin V. G. , Turbin M. V.
Published: May 2019

We study the optimal feedback control problem for the motion of Bingham media with periodic boundary conditions in two- and three-dimensional cases. First, the considered problem is interpreted as an operator inclusion with a multivalued right-hand side. Then, the approximation-topological approach to hydrodynamic problems and the degree theory for a class of multivalued maps are used to prove the existence of solutions of this inclusion. Finally, we prove that, among the solutions of the considered problem, there exists one minimizing the given cost functional.
The least distance between extremums and minimal period of solutions to autonomous vector differential equations
Authors: Zevin A. A.
Published: May 2019

Solutions x(t) of the Lipschitz equation x = f(x) with an arbitrary vector norm are considered. It is proved that the sharp lower bound for the distances between successive extremums of xk(t) equals π/L where L is the Lipschitz constant. For non-constant periodic solutions, the lower bound for the periods is 2π/L. These estimates are achieved for norms that are invariant with respect to permutation of the indices.