Siberian Branch of the Russian Academy of Sciences

The fish species Cottus kuznetzovi was described by L.S. Berg in 1903 from the Lena River system. However, two years after its description, Berg synonymized this sculpin with the widely distributed species C. poecilopus Heckel, 1837. It remained a junior synonym until 2009, when this species was redescribed and revalidated. Despite this, some researchers continue to doubt the validity of C. kuznetzovi. The authors obtained new materials from the Arctic region of Eastern Siberia and the upper reaches of the Lena River. This made it possible to apply molecular genetic methods to resolve issues related to the taxonomic status and genetic differentiation of C. kuznetzovi, and also enabled the discovery of this species in new areas. As a result of the analysis of the nucleotide sequences of the mtDNA control region (CR) and the cytochrome b gene (cytb), individuals of the species C. kuznetzovi were identified in the upper reaches of the Lena River, as well as in the Aldan, Indigirka, and Yana river systems. The average p-distance (CR) between different populations was 0.97 ± 0.29%. The presented results indicate a strong genetic isolation of this species from all closely related sculpins. The average p-distances between C. kuznezovi and closely related species of the group “Cottus poecilopus” ranged from 2.50 ± 0.47% to 3.95 ± 0.63% for CR marker, and from 1.50 ± 0.35% to 7.95 ± 0.81% for cytb marker. The validity of this species has been reliably established.

Geochemistry and thermobarometry of mantle xenocrysts and xenoliths from Mir kimberlite pipe were studied using new EPMA, SEM and LA ICP MS analysesThe PTX plot for the Mir pipe (Malo-Botuobinsky field) (Ashchepkov et al., 2010; 2014; 2019; 2022; 2023) shows the large interval from 8 to 1.1 GPa. The garnets show rathe narrow PT and P-Fe# but very wide P-Ca plots starting from the middle pyroxenitic layer to LAB. The Cr-Cpx and Cr-Sp are coinciding in Fe# in general. But the eclogites show very wide range of compositions trend. Diamond inclusions (DIA) (Sobolev, et al., 1976; 1997; Bulanova et al., 2002; Logvinova et al., 2004) the DIA pyropes have an opposite trend. In the P (GPa)-CaO plot largest variations in CaO are in the lower part of the mantle section. The most magnesian dunite varieties form an interval from 6.5 to 5 GPa, and then above them, the harzburgitic garnets again appear in the middle part of SCLM. There is high proportion of peridotite Cr-bearing varieties of ortho-and clinopyroxenes in the middle SCLM, which suggests that pyroxenites originated from peridotite partial melts. Omphacites together with garnets form an ascending P-Fe# plot. The geothermal conditions traced by DIA also form two branches. Even Cr-garnets partly trace the convective branch, although this is not evident in the middle part. The Cr-garnets are found at higher temperature conditions at deeper part of the SCLM. However, most of them plot between the 35–40 mWm−2 geotherms. The Cr-pyroxenites and Cr-diopsides form the colder branches to 35 mWm−2 geotherms or even lower. In the P-fO2 diagram, the less oxidized conditions correspond to the eclogitic clinopyroxenes in middle SCLM. At high pressures, the Cr-rich garnets give the lowest fO2 conditions.The REE patterns of the pyropes show wide range of compositions from S-shaped dunitic to semi – rounded lherzolitic and flattened HREE harzburgitic and LREE enriched pyroxenitic. In multicomponent diagram they show peaks in Th-U and Pb and troughs in Sr and highly synchronously varying HFSE.The Cpx form Gar lherzolites are showing several groups commonly inclined La/Ybn ~100 (normalization to primitive mantle (McDonough and Sun, 1995) with the hump at Ce- to Nd. In MCD they show very wide variations even in LILE from peak in Ba Rb to deep troughs and the same for U, Th. Pb, Sr. The HFSE are mostly moderately depleted (Zr

This paper solves an inverse problem for integral equation of convolution type of the second kind. This problem involves finding the right-hand side of the equation from the solution of the direct problem, which is known on a certain subset of its definition. Crucially, the kernel function in the integral operator is zero in the neighborhood of zero and unknown outside this neighborhood.

Aim: to present clinical guidelines describing the clinical, laboratory, endoscopic and histological characteristics of autoimmune gastritis (AIG) and to provide information support for decision-making on diagnosis, prognosis assessment and choice of management tactics for patients with AIG. Key points. AIG is an organ-specific autoimmune disease characterized by the presence of antibodies to parietal cells and/or intrinsic factor, in which inflammation and atrophy are limited to the gastric mucosa, functionally manifesting as hypo- and achlorhydria. There is evidence of an increase in the incidence of AIG worldwide. AIG is often associated with autoimmune thyroiditis (up to 40 % of cases), type 1 diabetes mellitus, and autoimmune polyglandular syndrome. Data on laboratory diagnostic methods, esophagogastroduodenoscopy, and histological examination of biopsies are presented, with an analysis of the endoscopic and histological picture typical of AIG. When AIG is combined with H. pylori infection, eradication therapy is recommended. In addition to symptomatic treatment and treatment of anemia, long-term rebamipide therapy is recommended to potentiate the protective properties of the gastric mucosa. Endoscopic monitoring of patients with AIG is recommended at intervals of once every 3 years.

We revisit the classical non-clairvoyant problem of scheduling a set of n jobs on a set of m parallel identical machines where the processing time of a job is not known until the job finishes. Our objective is the minimization of the makespan, i.e., the date at which the last job terminates its execution. We adopt the framework of learning-augmented algorithms and we study the question of whether (possibly erroneous) predictions may help design algorithms with a competitive ratio which is good when the prediction is accurate (consistency), deteriorates gradually with respect to the prediction error (smoothness), and not too bad and bounded when the prediction is arbitrarily bad (robustness). We first consider the non-preemptive case and we devise lower bounds, as a function of the error of the prediction, for any deterministic learning-augmented algorithm. Then we analyze a variant of the Longest Processing Time first algorithm (with and without release dates) and we prove that it is consistent, smooth, and robust. Furthermore, we study the preemptive case and we provide lower bounds for any deterministic algorithm with predictions as a function of the prediction error. Finally, we introduce a variant of the classical Round Robin algorithm, the Predicted Proportional Round Robin algorithm, which we prove to be consistent, smooth, and robust.