Publications by authors named "T A Romanova"

104 Publications

Layered van der Waals Topological Metals of TaTMTe (TM = Ir, Rh, Ru) Family.

J Phys Chem Lett 2021 Jul 15;12(28):6730-6735. Epub 2021 Jul 15.

Institute for Solid State Research, Leibniz IFW Dresden, Helmholtzstrasse 20, 01069 Dresden, Germany.

Layered van der Waals materials of the family TaTMTe (TM = Ir, Rh, Ru) are showing interesting electronic properties. We report the growth and characterization of TaIrTe, TaRhTe, TaIrRhTe ( = 0.06, 0.14, 0.78, 0.92), TaRuTe single crystals. X-ray powder diffraction confirms that TaRhTe is isostructural to TaIrTe. All these compounds are metallic with diamagnetic behavior. Below ≈ 4 K we observed signatures of the superconductivity in the TaIrRhTe compounds for = 0.92. All samples show weak quadratic-in-field magnetoresistance (MR). However, for TaIrRhTe with ≈ 0.78, the MR has a linear term dominating in low fields that indicates the presence of Dirac cones in the vicinity of the Fermi energy. For TaRhTe series the MR is almost isotropic. Electronic structure calculations for TaIrTe and TaRhTe reveal appearance of the Rh band close to the Fermi level.
View Article and Find Full Text PDF

Download full-text PDF

Source
http://dx.doi.org/10.1021/acs.jpclett.1c01648DOI Listing
July 2021

Use of Silicon Nanowire Sensors for Early Cancer Diagnosis.

Molecules 2021 Jun 18;26(12). Epub 2021 Jun 18.

Institute of Biomedical Chemistry, 119121 Moscow, Russia.

The review covers some research conducted in the field of medical and biomedical application of devices based on silicon sensor elements (Si-NW-sensors). The use of Si-NW-sensors is one of the key methods used in a whole range of healthcare fields. Their biomedical use is among the most important ones as they offer opportunities for early diagnosis of oncological pathologies, for monitoring the prescribed therapy and for improving the people's quality of life.
View Article and Find Full Text PDF

Download full-text PDF

Source
http://dx.doi.org/10.3390/molecules26123734DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8234636PMC
June 2021

[Sleep disorders in patients with myastenia gravis].

Authors:
T V Romanova

Zh Nevrol Psikhiatr Im S S Korsakova 2021 ;121(4. Vyp. 2):92-97

Samara State Medical University of the Ministry of Health of the Russian Federation. Samara, Russi, Samara State Medical University of the Ministry of Health of the Russian Federation. Samara, Russia.

This review analyzes publications that present data on sleep disorders in patients with myasthenia gravis (MG). The analysis is based on domestic and foreign publications that are freely available over the past 30 years. Sleep disorders, the most significant of which are sleep-related respiratory disorders, are one of the factors that cause quality of life decreasing and mortality in patients with neuromuscular diseases. The issues of prevalence of breathing disorders during sleep, relationship of these disorders with clinical and immunological characteristics of disease, demographic indicators are studied. The influence of sleep breathing disorders on quality of life and affective sphere of patients is discussed. Most studies prove that sleep-related respiratory disorders occur in patients with MG significantly more often than in general population. Some studies show a high prevalence of poor sleep quality, excessive daytime sleepiness in patients with MG, while others do not report such associations. However, studies that failed to establish an association with MG and sleep disturbances were of small sample sizes. Thus, given the inconclusive evidence and limited literature, further study of sleep disorders in patients with MG is needed. The topic is relevant and requires further development.
View Article and Find Full Text PDF

Download full-text PDF

Source
http://dx.doi.org/10.17116/jnevro202112104292DOI Listing
June 2021

Gut Microbiome in a Russian Cohort of Pre- and Post-Cholecystectomy Female Patients.

J Pers Med 2021 Apr 12;11(4). Epub 2021 Apr 12.

Institute of Chemical Biology and Fundamental Medicine, Siberian Branch of the Russian Academy of Sciences, Novosibirsk 630090, Russia.

The last decade saw extensive studies of the human gut microbiome and its relationship to specific diseases, including gallstone disease (GSD). The information about the gut microbiome in GSD-afflicted Russian patients is scarce, despite the increasing GSD incidence worldwide. Although the gut microbiota was described in some GSD cohorts, little is known regarding the gut microbiome before and after cholecystectomy (CCE). By using Illumina MiSeq sequencing of 16S rRNA gene amplicons, we inventoried the fecal bacteriobiome composition and structure in GSD-afflicted females, seeking to reveal associations with age, BMI and some blood biochemistry. Overall, 11 bacterial phyla were identified, containing 916 operational taxonomic units (OTUs). The fecal bacteriobiome was dominated by (66% relative abundance), followed by (19%), (8%) and (4%) phyla. Most (97%) of the OTUs were minor or rare species with ≤1% relative abundance. and were linked to blood bilirubin. Some taxa had differential pre- and post-CCE abundance, despite the very short time (1-3 days) elapsed after CCE. The detailed description of the bacteriobiome in pre-CCE female patients suggests bacterial foci for further research to elucidate the gut microbiota and GSD relationship and has potentially important biological and medical implications regarding gut bacteria involvement in the increased GSD incidence rate in females.
View Article and Find Full Text PDF

Download full-text PDF

Source
http://dx.doi.org/10.3390/jpm11040294DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8070538PMC
April 2021

Optimized packing multidimensional hyperspheres: a unified approach.

Math Biosci Eng 2020 09;17(6):6601-6630

Technological Institute of Sonora (ITSON), Obregón-City, Sonora, Mexico.

In this paper an optimized multidimensional hyperspheres packing problem (HPP) is considered for a bounded container. Additional constraints, such as prohibited zones in the container or minimal allowable distances between spheres can also be taken into account. Containers bounded by hyper- (spheres, cylinders, planes) are considered. Placement constraints (non-intersection, containment and distant conditions) are formulated using the phi-function technique. A mathematical model of HPP is constructed and analyzed. In terms of the general typology for cutting & packing problems, two classes of HPP are considered: open dimension problem (ODP) and knapsack problem (KP). Various solution strategies for HPP are considered depending on: a) objective function type, b) problem dimension, c) metric characteristics of hyperspheres (congruence, radii distribution and values), d) container's shape; e) prohibited zones in the container and/or minimal allowable distances. A solution approach is proposed based on multistart strategies, nonlinear programming techniques, greedy and branch-and-bound algorithms, statistical optimization and homothetic transformations, as well as decomposition techniques. A general methodology to solve HPP is suggested. Computational results for benchmark and new instances are presented.
View Article and Find Full Text PDF

Download full-text PDF

Source
http://dx.doi.org/10.3934/mbe.2020344DOI Listing
September 2020
-->