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Article ; Online: The role of ion sources in synthesis of the super-heavy elements.

Efremov, A / Bogomolov, S / Mironov, V

2020 Volume 91, Issue 1, Page(s) 13314

Abstract: Since the early 1970s, attempts to synthesize Super Heavy Elements (SHE) have been made in many laboratories around the world. One of the main requirements of these experiments is a sufficiently large dose of target irradiation, which should be increased ...

Abstract	Since the early 1970s, attempts to synthesize Super Heavy Elements (SHE) have been made in many laboratories around the world. One of the main requirements of these experiments is a sufficiently large dose of target irradiation, which should be increased with a decrease in the reaction cross section. In this regard, the capacities of ion sources play an important role for the successful synthesis of SHE. At the FLNR JINR, the discovery and investigation of the new region of super heavy nuclei were based on fusion reactions of
Language	English
Publishing date	2020-02-03
Publishing country	United States
Document type	Journal Article
ZDB-ID	209865-9
ISSN	1089-7623 ; 0034-6748
ISSN (online)	1089-7623
ISSN	0034-6748
DOI	10.1063/1.5128172
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Article: New Species of the Genus Typha L. (Typhaceae) from India

Krasnova, A. N. / Efremov, A. N.

Inland water biology. 2022 Aug., v. 15, no. 4

2022

Abstract: The description of a new cattail species, Typha vembanada A. Krasnova et Efremov, found in the shallow water of Vembanad Lake (Kerala, India) is given. Habitually, it does not differ from the T. angustifolia L. and T. australis Schum. et Thonn. (=T. ... ...

Abstract	The description of a new cattail species, Typha vembanada A. Krasnova et Efremov, found in the shallow water of Vembanad Lake (Kerala, India) is given. Habitually, it does not differ from the T. angustifolia L. and T. australis Schum. et Thonn. (=T. angustata Bory & Schaub.), given for this territory. Pistillate flowers T. vembanada by the number of bracteoles is close to T. australis, however the shape of the bracteoles is different. T. vembanada differs by a long narrow ribbonlike stigma, long column, ovary on a short pedicel, club-shaped carpodia (degraded flowers) with wide transparent bracteoles, small elliptical seeds, and wide ribbonlike hairs on the stamen axis.
Keywords	lakes ; new species ; pedicel ; stigma ; India
Language	English
Dates of publication	2022-08
Size	p. 368-373.
Publishing place	Pleiades Publishing
Document type	Article
ZDB-ID	2424544-6
ISSN	1995-0837 ; 1995-0829
ISSN (online)	1995-0837
ISSN	1995-0829
DOI	10.1134/S1995082922040356
Database	NAL-Catalogue (AGRICOLA)

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Article: Assessing the genuine identity of alien Vallisneria (Hydrocharitaceae) species in Europe

Mesterházy, A. / Somogyi, G. / Efremov, A. / Verloove, F.

Aquatic botany. 2021 Sept., v. 174

2021

Abstract: The genus Vallisneria consists of linear-leaved aquatic plants within the Hydrocharitaceae family. Only one indigenous member (V. spiralis) occurs in Europe. Populations of alien species appeared in some European countries in recent decades and these ... ...

Abstract	The genus Vallisneria consists of linear-leaved aquatic plants within the Hydrocharitaceae family. Only one indigenous member (V. spiralis) occurs in Europe. Populations of alien species appeared in some European countries in recent decades and these were named in various ways. To clarify the identity of alien Vallisneria we collected samples for a molecular phylogenetic analysis from six populations in five European countries. We investigated the nuclear ribosomal Internal Transcribed Spacer (ITS) region. Based on our results we found that samples from Belgium, Germany, Hungary and Italy belong to the recently described V. australis, a species native to Australia, while a sample from Russia is identical with V. neotropicalis. We provide a key to distinguish these from other similar species. All populations probably derived from dumped plant parts in the drainage water from aquariums. Most populations of V. australis are established and this species might therefore become invasive in the future. The investigated V. australis populations proved to be not uniform genetically.
Keywords	Russia ; drainage water ; indigenous species ; internal transcribed spacers ; introduced species ; phylogeny ; Australia ; Belgium ; Germany ; Hungary ; Italy
Language	English
Dates of publication	2021-09
Publishing place	Elsevier B.V.
Document type	Article
ZDB-ID	390388-6
ISSN	0304-3770
ISSN	0304-3770
DOI	10.1016/j.aquabot.2021.103431
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: Breakdown of category-specific word representations in a brain-constrained neurocomputational model of semantic dementia.

Shtyrov, Yury / Efremov, Aleksei / Kuptsova, Anastasia / Wennekers, Thomas / Gutkin, Boris / Garagnani, Max

Scientific reports

2023 Volume 13, Issue 1, Page(s) 19572

Abstract: The neurobiological nature of semantic knowledge, i.e., the encoding and storage of conceptual information in the human brain, remains a poorly understood and hotly debated subject. Clinical data on semantic deficits and neuroimaging evidence from ... ...

Abstract	The neurobiological nature of semantic knowledge, i.e., the encoding and storage of conceptual information in the human brain, remains a poorly understood and hotly debated subject. Clinical data on semantic deficits and neuroimaging evidence from healthy individuals have suggested multiple cortical regions to be involved in the processing of meaning. These include semantic hubs (most notably, anterior temporal lobe, ATL) that take part in semantic processing in general as well as sensorimotor areas that process specific aspects/categories according to their modality. Biologically inspired neurocomputational models can help elucidate the exact roles of these regions in the functioning of the semantic system and, importantly, in its breakdown in neurological deficits. We used a neuroanatomically constrained computational model of frontotemporal cortices implicated in word acquisition and processing, and adapted it to simulate and explain the effects of semantic dementia (SD) on word processing abilities. SD is a devastating, yet insufficiently understood progressive neurodegenerative disease, characterised by semantic knowledge deterioration that is hypothesised to be specifically related to neural damage in the ATL. The behaviour of our brain-based model is in full accordance with clinical data-namely, word comprehension performance decreases as SD lesions in ATL progress, whereas word repetition abilities remain less affected. Furthermore, our model makes predictions about lesion- and category-specific effects of SD: our simulation results indicate that word processing should be more impaired for object- than for action-related words, and that degradation of white matter should produce more severe consequences than the same proportion of grey matter decay. In sum, the present results provide a neuromechanistic explanatory account of cortical-level language impairments observed during the onset and progress of semantic dementia.
MeSH term(s)	Humans ; Frontotemporal Dementia/pathology ; Neurodegenerative Diseases/pathology ; Temporal Lobe/diagnostic imaging ; Temporal Lobe/pathology ; Brain/diagnostic imaging ; Semantics ; Psychomotor Performance ; Magnetic Resonance Imaging/methods
Language	English
Publishing date	2023-11-10
Publishing country	England
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	2615211-3
ISSN	2045-2322 ; 2045-2322
ISSN (online)	2045-2322
ISSN	2045-2322
DOI	10.1038/s41598-023-41922-8
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Article: On Relationships between Plasma Chemistry and Surface Reaction Kinetics Providing the Etching of Silicon in CF

Baek, Seung Yong / Efremov, Alexander / Bobylev, Alexander / Choi, Gilyoung / Kwon, Kwang-Ho

Materials (Basel, Switzerland)

2023 Volume 16, Issue 14

Abstract: In this work, we discuss the effects of component ratios on plasma characteristics, chemistry of active species, and silicon etching kinetics in ... ...

Abstract	In this work, we discuss the effects of component ratios on plasma characteristics, chemistry of active species, and silicon etching kinetics in CF
Language	English
Publishing date	2023-07-17
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2487261-1
ISSN	1996-1944
ISSN	1996-1944
DOI	10.3390/ma16145043
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Article: On Relationships between Gas-Phase Chemistry and Reactive Ion Etching Kinetics for Silicon-Based Thin Films (SiC, SiO

Efremov, Alexander / Lee, Byung Jun / Kwon, Kwang-Ho

Materials (Basel, Switzerland)

2021 Volume 14, Issue 6

Abstract: This work summarizes the results of our previous studies related to investigations of reactive ion etching kinetics and mechanisms for widely used silicon-based materials (SiC, ... ...

Abstract	This work summarizes the results of our previous studies related to investigations of reactive ion etching kinetics and mechanisms for widely used silicon-based materials (SiC, SiO
Language	English
Publishing date	2021-03-15
Publishing country	Switzerland
Document type	Journal Article ; Review
ZDB-ID	2487261-1
ISSN	1996-1944
ISSN	1996-1944
DOI	10.3390/ma14061432
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Article: Otsenka psikhicheskogo zdorov'ya meditsinskikh rabotnikov v period pandemii COVID-19 v Rossii (rezul'taty internet-oprosa).

Bachilo, E V / Novikov, D E / Efremov, A A

Zhurnal nevrologii i psikhiatrii imeni S.S. Korsakova

2021 Volume 121, Issue 3, Page(s) 104–109

Abstract: Objective: To assess the mental health of health workers during a pandemic.: Material and methods: Eight hundred and twelve medical workers took part in a cross-sectional Internet survey. The questionnaire included a socio-demographic block, a block ... ...

Title translation	Mental health assessment of medical workers during the COVID-19 pandemic in Russia: results of an online survey.
Abstract	Objective: To assess the mental health of health workers during a pandemic. Material and methods: Eight hundred and twelve medical workers took part in a cross-sectional Internet survey. The questionnaire included a socio-demographic block, a block of questionnaires for assessing the level of symptoms of anxiety and depression (PHQ-9 and GAD-7). The data were processed using statistical methods. Results: The prevalence of anxiety and depression among healthcare providers during the pandemic was 48.77% and 57.63% respectively. Subjectively poor quality of sleep was noted by 37.4% of respondents. Cluster analysis distinguished 4 groups of respondents: group 1 was characterized by high scores on PHQ-9 and GAD-7 and a low subjective assessment of sleep quality; group 2 had low scores on PHQ-9 and GAD-7 and a high subjective assessment of sleep quality; respondents from clusters 3 and 4 had average total scores on PHQ-9 and GAD-7, however, group 4 was characterized by significantly lower values of subjective sleep quality assessment. Conclusion: The division into clusters makes it possible to understand which groups of medical workers require psychological (psychotherapeutic) support in the first place. Cluster 1 respondents with high levels of anxiety and depression, as well as poor sleep quality, need priority assistance.
MeSH term(s)	Anxiety/diagnosis ; Anxiety/epidemiology ; COVID-19 ; Cross-Sectional Studies ; Depression/diagnosis ; Depression/epidemiology ; Health Personnel ; Humans ; Mental Health ; Pandemics ; Russia/epidemiology ; SARS-CoV-2 ; Surveys and Questionnaires
Language	Russian
Publishing date	2021-04-08
Publishing country	Russia (Federation)
Document type	Journal Article
ZDB-ID	1201462-x
ISSN	2309-4729 ; 1997-7298 ; 0044-4588
ISSN (online)	2309-4729
ISSN	1997-7298 ; 0044-4588
DOI	10.17116/jnevro2021121031104
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Article ; Online: Melatonin and its bioisosteres as potential therapeutic agents for the treatment of retinopathy of prematurity.

Osipova, N A / Panova, A Y / Efremov, A M / Lozinskaya, N A / Beznos, O V / Katargina, L A

Chemical biology & drug design

2024 Volume 103, Issue 3, Page(s) e14504

Abstract: We conducted a study on the impact of intraperitoneal injections of melatonin and its three bioisosteres (compounds 1-3) on the development of oxygen-induced retinopathy in newborn rats during a 21-day experiment. It was demonstrated that melatonin and ... ...

Abstract	We conducted a study on the impact of intraperitoneal injections of melatonin and its three bioisosteres (compounds 1-3) on the development of oxygen-induced retinopathy in newborn rats during a 21-day experiment. It was demonstrated that melatonin and its analogues 1-3 effectively reduce the total protein concentration in the vitreous body of rat pups, decrease concentration of VEGF-A, and lower the level of oxidative stress (as indicated by normalization of antioxidant activity in the vitreous body). Melatonin and its analogues 1-3 equally normalize the level of VEGF-A. Analogues 1 and 2 even exceed melatonin in their ability to reduce protein influx into the vitreous body. However, analogue 2 had no effect on antioxidant activity, while analogues 1 and 3 caused a significant increase in this parameter, with analogue 3 even slightly exceeding melatonin. Thus, it can be concluded that analogues 1-3 are comparable to melatonin and can be utilized as potential therapeutic agents for the treatment of retinopathy of prematurity.
MeSH term(s)	Rats ; Animals ; Melatonin/pharmacology ; Melatonin/therapeutic use ; Retinopathy of Prematurity/drug therapy ; Retinopathy of Prematurity/metabolism ; Antioxidants/pharmacology ; Antioxidants/therapeutic use ; Vascular Endothelial Growth Factor A/metabolism ; Disease Models, Animal
Chemical Substances	Melatonin (JL5DK93RCL) ; Antioxidants ; Vascular Endothelial Growth Factor A
Language	English
Publishing date	2024-03-11
Publishing country	England
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	2216600-2
ISSN	1747-0285 ; 1747-0277
ISSN (online)	1747-0285
ISSN	1747-0277
DOI	10.1111/cbdd.14504
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Article: Section Typha of the Genus Typha L. (Typhaceae): Structure, Taxonomic Composition, and Evolution

Krasnova, A. N / Efremov, A. N

Inland water biology. 2020 Apr., v. 13, no. 2

2020

Abstract: The taxonomic composition of section Typha, genus Typha L. (Typhaceae Juss.), is considered. An ecological reconstruction for the Cenozoic geological epochs is proposed. The representatives of section Typha reached acme in the Paleogene (Poltavian flora). ...

Abstract	The taxonomic composition of section Typha, genus Typha L. (Typhaceae Juss.), is considered. An ecological reconstruction for the Cenozoic geological epochs is proposed. The representatives of section Typha reached acme in the Paleogene (Poltavian flora). Climate cooling, first manifested during the Pliocene, was followed by shrinkage and insularization of the Eurasian living range of the section in the Pleistocene. However, the rapid expansion of cattail populations to the numerous glacial lakes of European Russia started after the regression of the Valdai glacier. Asian populations of the section Typha were formed under the harsh conditions to which the Arctotertiary flora of Eastern Siberia was exposed. The relief of Northeastern and Central Asia was transformed during the Oligocene, as the waters of the Thetys Sea regressed and vast land territories emerged: as a result, many Paleogene (Angarid) cattail populations became extinct. Some were preserved in refugia of the subarctic and Arctic zones. Cattail migrations during the Pleistocene were apparently halted and resumed according to the fluctuations of the water level of the Pacific Ocean and the joining or separation of land at the Beringian isthmus. The hybridization processes triggered by the separation of European and Asian populations attenuated the speciation processes. Cattail populations sensitive to moisture supply were incapable of a broad expansion. This had an especially strong influence on the formation of the northeastern populations. Most of the small autochthonous Angarid populations were eliminated, with some apparently preserved in refugia. The expansions of Pacific cattail populations into these regions were, on average, often disrupted during the Pleistocene due to ocean-level fluctuations, separation or joining of land, and cold periods, which were harsher than those in Europe. The emergence of hybrids and anomalies among the taxa in the living range of the section Typha set a trend for convergence processes.
Keywords	Oligocene epoch ; Pleistocene epoch ; Pliocene epoch ; Siberia ; Typha ; cold ; evolution ; flora ; glaciers ; global cooling ; hybridization ; refuge habitats ; shrinkage ; taxonomy ; Arctic region ; Central Asia ; Pacific Ocean
Language	English
Dates of publication	2020-04
Size	p. 141-146.
Publishing place	Pleiades Publishing
Document type	Article
Note	NAL-AP-2-clean
ZDB-ID	2424544-6
ISSN	1995-0837 ; 1995-0829
ISSN (online)	1995-0837
ISSN	1995-0829
DOI	10.1134/S1995082920010095
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: Mental Health of Medical Workers During the COVID-19 Pandemic in Russia: Results of a Cross-Sectional Study

Bachilo, E. / Barylnik, J. / Shuldyakov, A. / Efremov, A. / Novikov, D.

Abstract: This is the first study in Russia regarding the mental health of medical workers during a pandemic. In this survey, the study of medical workers during pandemic COVID-19 in Russia reported high rates of symptoms of depression and anxiety. There is a ... ...

Abstract	This is the first study in Russia regarding the mental health of medical workers during a pandemic. In this survey, the study of medical workers during pandemic COVID-19 in Russia reported high rates of symptoms of depression and anxiety. There is a higher risk of developing symptoms of anxiety and depression among young employees working directly in high-risk areas of the infection. Protecting medical workers is an important component of public health measures for addressing the COVID-19 pandemic. Special measures to improve the mental health of medical workers should be based on their needs. Special attention needs to be paid to young medical workers working in areas with a high risk of infection.
Keywords	covid19
Publisher	MedRxiv; WHO
Document type	Article ; Online
DOI	10.1101/2020.07.27.20162610
Database	COVID19

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