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Below is data on the microbial diversity of natural organic matter from the Dispersion Train of Sulfide Tailings (northern Salaire Ridge, southwestern Siberia, Russia, Ursk Village). Data was obtained using 16s rRNA amplicon directed metagenomic sequencing on Illumina MiSeq. The raw sequence data used for analysis is available in NCBI under the Sequence Read Archive (SRA) with BioProject No. PRJNA670045 and SRA accession number SRX9314152, SRX9314376. The data sequences of the 16s rRNA gene are presented at the links MW142408-MW142413, MW142414-MW142447.

В настоящее время в России происходит трансформация миграционных потоков, временный характер миграции меняется на постоянный. Основная доля мигрантов прибывает из стран Центральной Азии, где демографическая и экономическая ситуация приводит к долгосрочному росту потоков трудовых мигрантов. В этих условиях актуализируются вопросы их адаптации и интеграции. Исследование представляет собой обзор научной литературы, изучающей адаптационные практики трудовых мигрантов. Сравнительный анализ обусловлен важностью использования накопленного опыта европейских стран, которые проводят политику активной интеграции мигрантов. Поиск публикаций, отражающих вопросы изучения факторов и моделей адаптации трудовых мигрантов из Центральной Азии в России и странах Европейского союза, осуществлялся на площадках Scopus, Web of Science, e-Library. Выявлены возросший интерес к теме исследования, рост публикационной активности и увеличение количества совместных исследований данной проблематики представителями разных стран. В большинстве случаев исследователи отмечают роль социального капитала в адаптации мигрантов, длительность процесса аккультурации мигрантов и важность участия принимающего сообщества в этом процессе. Рассматривается опыт двусторонней адаптации в странах ЕС. По мере увеличения потока мигрантов в страны ЕС из Центральной Азии интерес западных исследователей к этой теме будет расти. Результаты исследования могут быть использованы для повышения эффективности изучения миграционных процессов. Currently, the Russian Federation is experiencing a transformation of migration flows from temporary to permanent. The largest share of migrants comes from the countries of Central Asia, where the demographic and economic situation stimulates a long-term increase in flows of labour migrants. In these conditions, it is necessary to examine issues of adaptation and integration of migrants. We review scientific literature on the adaptation practises of labour migrants. We applied the method of comparative analysis due to the importance the accumulated experience of European countries, which chose a policy of active integration. We analysed scientific publications, which are indexed in Scopus, Web of Science, E-library databases, and focused on the factors and models of adaptation of labour migrants from Central Asia in Russia and the countries of the European Union (EU). The study revealed the growing interest in the research topic, increased publication activity and joint research by representatives of different countries. In most cases, researchers note the role of social capital in the adaptation of migrants, the length of the acculturation process of migrants and the importance of participation of the host community in the process. We proposed to consider the experience of bilateral adaptation in the EU countries. As the flow of migrants to the EU countries from Central Asia increases, the interest in this topic on the part of Western researchers will grow. The research results can be used to improve efficiency in the research of migration processes. The article has been prepared with the support of Russian Foundation for Basic Research, the project No. 19–110–50312.

We study a unique deposit of Nb-REE ores that occur as three orebodies overlying weathered rocks of the Tomtor ultramafic alkaline-carbonatite complex in the northern Sakha Republic (Yakutia). The formation conditions of the rich Tomtor ores remain poorly constrained. Our hypothesis is that these ores, composed of detrital and authigenic minerals, were deposited in a hydrothermal lake. The Eh-pH parameters of water are reconstructed from REE distribution in ores and in monazite, with reference to results of thermodynamic calculations. The stability fields of hydrous Ce, La, and Nd phosphates in the Pourbaix diagrams are proximal in a region within a small range of pH (4-6) and Eh (-0.25 -+0.25 V). Monazite apparently formed by dehydration of the precursor phase of hydrous REE phosphate. This inference is supported by coexistence of Fe3+ and Fe2+ minerals.

The mineralogy (SEM), geochemistry (LA-ICP-MS) and isotopic composition of C, O and Sr in carbonates from uniquely high-grade REE-Nb ores of the Tomtor massif is presented. Testing of the formation conditions for uniquely high-grade ores from the Tomtor deposit was conducted.

Background Nothing is currently known about microbial composition of saline lakes of the Novosibirsk region and its dependence on physical-chemical parameters of waters. We studied the structure of microbial communities of saline lakes of the Novosibirsk region and the effect of physical-chemical parameters of waters on microbial communities of these lakes. Results According to the ion content, the lakes were classified either as chloride or chloride-sulfate types. Water salinity ranges from 4.3 to 290 g L−1. Many diverse microbial communities were found. Filamentous and colonial Cyanobacteria of the genera Scytonema, Aphanocapsa, and/or filamentous Algae dominated in littoral communities. Spatial and temporal organization of planktonic microbial communities and the quantities of Archaea and Bacteria were investigated using fluorescent in situ hybridization. We have found that the dominant planktonic component is represented by Archaea, or, less frequently, by Bacteria. Various phylogenetic groups (Bacteria, Archaea, Algae, and Cyanobacteria) are nonuniformly distributed. The principal component analysis was used to detect environmental factors that affect microorganism abundance. We found the principal components responsible for 71.1 % of the observed variation. It was demonstrated that two-block partial least squares was a better method than principal component analysis for analysis of the data. We observed general relationships between microbial abundance and water salinity. Conclusions We have performed the first-ever study of the structure of the microbial communities of eleven saline lakes in the Novosibirsk region along with their physical-chemical parameters of waters. Our study demonstrates that saline lakes in the Novosibirsk region contain a unique microbial communities that may become a prolific source of microorganisms for fundamental and applied studies in various fields of ecology, microbiology, geochemistry, and biotechnology, and deserve further metagenomic investigation.

Mercury species are highly toxic, and methylmercury is the most dangerous for environment and biota. The purpose of this study is to evaluate the distribution of mercury speciations (HgX2 (were X is O, SO2 4- , Cl and et al.), CH3Hg + , HgS) in diffuse halation high-sulfide waste of piles at the Ursk massive sulfide ore deposits which are being mined since the 1940s. To determine the mercury speciation, the method of thermal analysis with atomic absorption spectrometry as detector was applied.

Background Geothermal areas are of great interest for the study of microbial communities. The results of such investigations can be used in a variety of fields (ecology, microbiology, medicine) to answer fundamental questions, as well as those with practical benefits. Uzon caldera is located in the Uzon-Geyser depression that is situated in the centre of the Karym-Semyachin region of the East Kamchatka graben-synclinorium. The microbial communities of Zavarzin spring are well studied; however, its benthic microbial mat has not been previously described. Results Pyrosequencing of the V3 region of the 16S rRNA gene was used to study the benthic microbial community of the Zavarzin thermal spring (Uzon Caldera, Kamchatka). The community is dominated by bacteria (>95% of all sequences), including thermophilic, chemoorganotrophic Caldiserica (33.0%) and Dictyoglomi (24.8%). The benthic community and the previously examined planktonic community of Zavarzin spring have qualitatively similar, but quantitatively different, compositions. Conclusions In this study, we performed a metagenomic analysis of the benthic microbial mat of Zavarzin spring. We compared this benthic community to microbial communities found in the water and of an integral probe consisting of water and bottom sediments. Various phylogenetic groups of microorganisms, including potentially new ones, represent the full-fledged trophic system of Zavarzin. A thorough geochemical study of the spring was performed.