Currently, many countries of the world experience drinking water scarcity. In this aspect, Russia has an advantageous position, having on its territory Lake Baikal, the largest storage of fresh water. UNESCO declared Lake Baikal as a World Heritage Site whose state scientists from Russia and other countries monitor and study. An analysis of the literature and the author information about the Baikal aquatic ecosystem has shown 70-year invariability of macroelement water composition of Lake Baikal and its only outflow, the Angara River. The water of Baikal and the Angara River has a constant calcium bicarbonate composition and is saturated with oxygen, 10-14 mg/l or rarely more. The average mineralization of water in Baikal and the Angara source for the study period (1950-2018 and 1997-2018) is 95-97 (87-112) mg/l. The analysis of the 13-year (2006-2018) data on the trace element concentration in the Angara source has revealed a complex pattern of changes in concentrations of some elements. The time trends of the concentrations for the bulk of elements sometimes indicate abnormal (minimum-maximum) concentrations regardless of the season. This can be only due to “one-time or instantaneous” natural or anthropogenic changes in the Baikal environment. The Baikal tributaries indicate different chemical composition, which can be due to not only drainage of rocks with different content but also the anthropogenic impact. A simultaneous testing of water (during a month) has shown that some macro- and trace elements (F-, HCO3- and SO42-, as well as Li, Mo, B, U, Fe, etc.) have at the same time the similar concentrations in the water from Baikal, the Angara source and most tributaries.

Аннотация.Для QTL на пшеничной хромосоме 2A, ассоциированного с активностью липоксигеназы в условиях засухи, было выявлено 19 кандидатных генов с взаимосвязанными функциями.Среди них гены метаболических путей полифосфатов инозита, альдо

Аннотация.На хромосомах 2A и 2D мягкой пшеницы установлены позиции "hot spot" локусов, важных для регуляции ответов на водный дефицит.Биоинформационным анализом обнаружено в общей сложности 55 генов

We study the behavior of a number of siderophile elements, including platinum-group elements, during the formation of the Medek dunite-wehrlite intrusion. Its structural position, internal structure, and mineralogical composition are presented; a 3D geochemical model is constructed. The forsterite content of olivine varies from 90 to 73% from top to bottom of the vertical cross section of the intrusion. In addition, there is a decrease in the volume content of olivine and the appearance of ilmenite instead of accessory Cr-spinel. The observed zonation in variations in the composition of rocks and minerals is consistent with magmatic differentiation in a sheet-like body, which changed its primary occurrence. A geodynamic scenario is proposed, which links the formation of the intrusion with the break-up of Rodinia and the further changes in the primary occurrence with subsequent accretion-collision events on the southern and southwestern margins of the Siberian craton in the period 600-450 Ma. (C) 2018, V.S. Sobolev IGM, Siberian Branch of the RAS. Published by Elsevier B.V. All right reserved.

The aim of the research was to study the chemical composition of snow and soil of Svirsk city (Pribaikaľe) in order to assess the current environmental-geochemical situation in the city. Industrial specifics in Svirsk city is marked by higher concentrations of many toxic elements—As, Cd, Pb, W, Sb, Pb, Zn, Hg, and characteristic of preexisting and currently existing enterprises. The contents in biological matrices of some of the toxicants exceed physiological standards and violate the balance of elements necessary for people. The results of studies of the chemical (major and trace elements) composition of snow water, solid residue of snow and soil, a comparative analysis with earlier published data, and maximum permissible concentrations of elements have shown that the environmental situation in the city has been adversely affected within the last 20 years due to technogenesis.

This paper presents the first geochemical data on Cr-spinels from ultramafic rocks of the Alkhadyr terrane, which were obtained on a representative collection of samples using modern research methods. The compositional data on melt inclusions allowed the identification of three generations of Cr-spinels on the basis of their morphology, composition, and relationships with the rock-forming minerals. Different types of geochemical zoning were recognized in heterogeneous Cr-spinel grains. The composition of parental melt and crystallization temperatures of the minerals in ultramafic rocks were derived from the compositional data on Cr-spinels and trapped melt inclusions.