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Using real-world examples, we studied the seismic-gravity modeling possibilities for territories that differ in the features of the physical and geological structure, in the scale of research, and in the exploration degree. It has been shown that it is impossible to formalize a unified approach to the construction of a seismic-density model — the modeling method inevitably changes according to the physical and geological situation, the volume and quality of a priori data. The effectiveness of seismic-gravity modeling is reacting both on the geological features of the cross-section: the extent of compartmentalization of the reflector horizons' geometry, the contrast and depth of the density boundaries, the intricacy of the geological history of the region, and the survey methodological parameters.

In our paper, we study the impact of active investment strategies and factors of their success in the Russian market of collective investment — self-confidence of managers, commissions of management companies (MC) — on return rates of mutual funds. For the first time, not only equity mutual funds, but also bond mutual funds are considered as an object of study; the time period is since 2012. Our study is based on data on the structure of mutual fund portfolios provided by Investfunds. We propose a number of original indicators of an active management style and consider the profitability of mutual funds relative to various benchmarks. Based on testing of multivariate regression models, it has been revealed that the return rate of equity mutual funds is negatively affected by a share of stocks in the fund portfolio which are not included in the market index. When managers take into account their previous negative investment experience, it contributes to the growth of mutual fund return rates. Active investment strategies correlate with increased commissions (up to 4.5% of NAV), but they do not allow an investor to receive higher return rates than index investments. An increase in the share of corporate bonds allows the fund manager to outperform benchmarks for bond funds. For the first time, a nonlinear relationship between the size of mutual funds and the value of commissions has been revealed for the Russian market.

We have investigated nearly all of the currently available hydromagnetic survey data to study the magmatic structures in the sedimentary basin of the Barents Sea region. We use the modern interpretation techniques to process over 93 000 kilometres profile data of 1995–2017s. It was established that north-west striking dyke groups are abundant in the central and northern parts of the basin; in the south part no dykes were found. Magmatic structures in the sedimentary basin are reflected by the local magnetic anomalies of two types – the linear ones sourced by dykes, and mosaic ones associated with the local areas of magmatism. At sea depth of 100–500 m and sediment thickness over 8 km, the dominant depth of the upper edges of the bodies generating anomalies is about 1500 m.The analysis of the magnetic anomalies could help us to outline more exactly the sedimentary structures, the history of the magmatic processes and the tectonic evolution of the Barents Sea Region.

14 páginas.-- 5 figuras.-- 1 tabla.-- 80 referencias.-- Supporting data are included as Additional files. Phylogenetic data have been deposited at Tree BASE under the accession URL http://purl.org/phylo/treebase/phylows/study/TB2:S18113.-- The electronic version of this article is the complete one and can be found online at: http://www.biomedcentral.com/1471-2164/16/757 ; [Background] The Caldanaerobacter subterraneus species includes thermophilic fermentative bacteria able to grow on carbohydrates substrates with acetate and L-alanine as the main products. In this study, comprehensive analysis of three genomes of C. subterraneus subspecies was carried in order to identify genes encoding key metabolic enzymes and to document the genomic basis for the evolution of these organisms. ; [Methods] Average nucleotide identity and in silico DNA relatedness were estimated for the studied C. subterraneus genomes. Genome synteny was evaluated using R2CAT software. Protein conservation was analyzed using mGenome Subtractor. Horizontal gene transfer was predicted through the GOHTAM pipeline (using tetranucleotide composition) and phylogenetic analyses (by maximum likelihood). Hydrolases were identified through the MEROPS and CAZy platforms. ; [Results] The three genomes of C. subterraneus showed high similarity, although there are substantial differences in their gene composition and organization. Each subspecies possesses a gene cluster encoding a carbon monoxide dehydrogenase (CODH) and an energy converting hydrogenase (ECH). The CODH gene is associated with an operon that resembles the Escherichia coli hydrogenase hyc/hyf operons, a novel genetic context distinct from that found in archetypical hydrogenogenic carboxydotrophs. Apart from the CODH-associated hydrogenase, these bacteria also contain other hydrogenases, encoded by ech and hyd genes. An Mbx ferredoxin:NADP oxidoreductase homolog similar to that originally described in the archaeon Pyrococcus furiosus was uniquely encoded in the C. subterraneus subsp. yonseiensis genome. Compositional analysis demonstrated that some genes of the CODH-ECH and mbx operons present distinct sequence patterns in relation to the majority of the other genes of each genome. Phylogenetic reconstructions of the genes from these operons and those from the ech operon are incongruent to the species tree. Notably, the cooS gene of C. subterraneus subsp. pacificus and its homologs in C. subterraneus subsp. tengcongensis and C. subterraneus subsp. yonseiensis form distinct clades. The strains have diverse hydrolytic enzymes and they appear to be proteolytic and glycolytic. Divergent glycosidases from 14 families, among them amylases, chitinases, alpha-glucosidases, beta-glucosidases, and cellulases, were identified. Each of the three genomes also contains around 100 proteases from 50 subfamilies, as well about ten different esterases. Conclusions: Genomic information suggests that multiple horizontal gene transfers conferred the adaptation of C. subterraneus subspecies to extreme niches throughout the carbon monoxide utilization and hydrogen production. The variety of hydrolases found in their genomes indicate the versatility of the species in obtaining energy and carbon from diverse substrates, therefore these organisms constitute a remarkable resource of enzymes with biotechnological potential. © 2015 Sant'Anna et al. ; FHS received scholarship from Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES, Brazil), process number 2403-13-7. The work of AVL and TGS was supported by the Russian Scientific Fund grant no. 14-24-00165. JMG acknowledges funding through projects CSD2009-00006, CGL2014-58762-P and GEN2006-26423-E from the Spanish Ministry of Economy and Competitiveness and RNM2529 and BIO288 from the Andalusian Government; Feder funds cofinanced these projects. C. subterraneus pacificus genome sequencing was carried out by the J. Craig Venter Institute through the Microbial Genome Sequencing Project sponsored by The Gordon and Betty Moore Foundation's Marine Microbiology Initiative. Funding from the mobility programme 003-ABEL-CM-2013 (NILS Science and Sustainability programme, EEA grants) is also acknowledged. FTR acknowledges the support of a US National Science Foundation Grant. FTR acknowledges grant support from the Center for Dark Energy Biosphere Investigations (C-DEBI), an NSF Research Center at the University of Southern California. We acknowledge support of the publication fee by the CSIC Open Access Publication Support Initiative through its Unit of Information Resources for Research (URICI). ; Peer reviewed

Complex research of the most important physico-chemical and mechanical properties (granulometric composition, hygroscopicity, caking, dusting, compactability, friability) of model system based on potassium sulfate and experimental samples of potassium sulfate and potassium-magnesia has been conducted. The experimental samples of potassium sulphate and potassium-magnesia were obtained in the processing of polymineral ore in the presence of various amounts of impurity inorganic salts (magnesium sulfate and chloride, sodium chloride). The obtained chlorine-free fertilizers have low hygroscopicity and low caking, but they are characterized by high dusting. Studies of the influence of dust-suppressors of different chemical nature on dusting of model and experimental samples of potassium sulfate and potassium-magnesia have shown that polyethylene glycol PEG-400 has the highest dust suppression effect on these fertilizers. Using PEG-400 has no negative influence to the friability, caking and compactability of fertilizers.