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Вид документа : Статья из журнала
Шифр издания : 577.34 /С 57
Автор(ы) : Зотина, Татьяна Анатольевна, Трофимова, Елена Александровна, Дементьев, Дмитрий Владимирович, Карпов, Антон Дмитриевич, Паньков, Егор Викторович, Болсуновский, Александр Яковлевич
Заглавие : Содержание техногенных радионуклидов в промысловых рыбах р. Енисей в период работы реакторного производства на Горно-химическом комбинате и после его остановки : статья
Место публикации : Вопросы радиационной безопасности. - Озерск: Федеральное государственное унитарное предприятие Производственное объединение Маяк, 2016. - № 2. - С. 28-35. - ISSN 1816-9643
УДК : 577.34 + 574.524 + 597.5
Ключевые слова (''Своб.индексиров.''): хариус--елец--щука--thymallus arcticus--leuciscus leuciscus baicalensis--esox lucius--grayling--dace--pike
Аннотация: Река Енисей загрязнена техногенными радионуклидами в результате производства оружейного плутония на Горно-химическом комбинате (ГХК) в г. Железногорске (Россия) в течение более 50 лет. Последнее реакторное производство на ГХК было остановлено в 2010 г. В данной работе представлены данные по накоплению техногенных радионуклидов промысловыми рыбами (щукой, Esox lucius; хариусом, Thymallus arcticus, и ельцом, Leuciscus leuciscus baicalensis), обитающими на радиоактивно загрязненном участке р.Енисей в 2005-2014 гг. Из числа техногенных радионуклидов, которые регистрировались в мышцах рыб во время работы последнего ядерного реактора (32P, 60Co, 65Zn, 137Cs), только 137Cs регистрировался в течение четырех лет после остановки реакторного производства на ГХК. Содержание 137Cs в мышцах рыб было значительно ниже установленных в Российской Федерации санитарных норм. Содержание 137Cs в мышцах хищных рыб было выше, чем в мышцах мирных. Содержание 137Cs в ихтиофауне р. Енисей не снизилось после остановки последнего реакторного производства на ГХК, в то время как содержание радионуклидов с наведенной активностью снизилось значительно. Это можно объяснить неизменным потоком 137Cs в р. Енисей со сбросами радиохимического производства ГХК и депозитами 137Cs в донных отложениях. Можно ожидать, что концентрация 137Cs в мышцах рыб не снизится в ближайшие десятилетия. The Yenisei River is contaminated with artificial radionuclides due to the weapons-grade plutonium production at the Mining-and-Chemical Combine (MCC) at Zheleznogorsk (Russia) for more than 50 years. The last reactor plant at the MCC was shut down in 2010. The research presents the data on accumulation of artificial radionuclides in wild fish (pike, Esox lucius; grayling, Thymallus arcticus; and dace, Leuciscus leuciscus baicalensis) inhabiting the radioactively contaminated part of the Yenisei River between 2005 and 2014. Among artificial radionuclides that were detected in fish muscles when the last nuclear reactor plant was operating (32P, 60Co, 65Zn, 137Cs), only 137Cs was recorded four years after the shutdown of the nuclear power plant at the MCC. The concentrations of 137Cs in fish muscles were considerably below the sanitary norms for this radionuclide in the Russian Federation. Piscivorous fish species accumulated higher concentration of 137Cs in their muscles than non-predatory species. Concentration of 137Cs in fish fauna of the Yenisei River did not decrease after the shutdown of the last nuclear power plant at the MCC, while the concentration of radionuclides with induced activity decreased considerably. This can be explained by the constant inflow of 137Cs into the Yenisei River due to discharges from the radiochemical plant at the MCC and the deposits of 137Cs in the bottom sediments. We can expect that the concentration of 137Cs in fish muscles will not decrease in the next few decades.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zotina T. A., Trofimova E. A., Dementyev D. V., Bolsunovsky A. Y.
Заглавие : Age-dependent accumulation of 137Cs by pike Esox lucius in the Yenisei River
Место публикации : Dokl. Biol. Sci. - 2016. - Vol. 468, Is. 1. - С. 133-136. - ISSN 00124966 (ISSN) , DOI 10.1134/S0012496616030108
Аннотация: Age-dependent accumulation of 137Cs in the muscles and bodies of the pike Esox lucius (aged two to seven years) inhabiting a section of the Yenisei River polluted with artificial radionuclides has been studied. The content of 137Cs in muscles varied from 0.5 to 7.0 Bq/kg of fresh weight. The maximum content of the radionuclide has been found in juveniles. The content of 137Cs in pike muscles and body decreased considerably with age. The high content of 137Cs in the muscles of juveniles is probably a consequence of their higher intensity of feeding as compared to older individuals, which is due to the intense growth of juveniles. © 2016, Pleiades Publishing, Ltd.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Rozhko T. V., Guseynov O. A., Guseynova V. E., Bondar A. A., Devyatlovskaya A. N., Kudryasheva N. S.
Заглавие : Is bacterial luminescence response to low-dose radiation associated with mutagenicity?
Место публикации : J. Environ. Radioact.: Elsevier Ltd, 2017. - Vol. 177. - С. 261-265. - ISSN 0265931X (ISSN) , DOI 10.1016/j.jenvrad.2017.07.010
Ключевые слова (''Своб.индексиров.''): bioassay--dna--low-dose radiation--luminous marine bacteria--mutations--bacteria--bioassay--bioluminescence--chemical activation--dna--dna sequences--genes--ionizing radiation--kinetics--luminescence--nucleic acids--phosphorescence--physiological models--radioisotopes--bacterial suspensions--beta-emitting radionuclides--low dose radiation--luminescence intensity--marine bacterium--mutations--photobacterium phosphoreum--physiological parameters--radiation--bacteria (microorganisms)--photobacterium phosphoreum
Аннотация: Luminous marine bacteria are widely used in bioassays with luminescence intensity being a physiological parameter tested. The purpose of the study was to determine whether bacterial genetic alteration is responsible for bioluminescence kinetics change under low-dose radiation exposure. The alpha-emitting radionuclide 241Am and beta-emitting radionuclide 3H were used as the sources of low-dose ionizing radiation. Changes of bioluminescence kinetics of Photobacterium phosphoreum in solutions of 241Am(NO3)3, 7 kBq/L, and tritiated water, 100 MBq/L, were studied; bioluminescence kinetics stages (absence of effect, activation, and inhibition) were determined. Bacterial suspension was sampled at different stages of the bioluminescent kinetics; the doses accumulated by the samples were close or a little higher than a tentative limit of a low-dose interval: 0.10 and 0.85 Gy for 241Am, or 0.11 and 0.18 Gy for 3H. Sequence analysis of the 16S ribosomal RNA gene did not reveal a mutagenic effect of low-dose alpha and beta radiation in the bacterial samples. Previous results on bacterial DNA exposed to low-dose gamma radiation (0.25 Gy) were analyzed and compared to those for alpha and beta irradiation. It is concluded that bioluminescence activation and/or inhibition under the applied conditions of low-dose alpha, beta and gamma radioactive exposure is not associated with DNA mutations in the gene sequences tested. © 2017 Elsevier Ltd
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kudryasheva N. S., Kovel E. S.
Заглавие : Monitoring of Low-Intensity Exposures via Luminescent Bioassays of Different Complexity: Cells, Enzyme Reactions, and Fluorescent Proteins
Колич.характеристики :18 с
Место публикации : Int J Mol Sci: NLM (Medline), 2019. - Vol. 20, Is. 18. - Ст.4451. - ISSN 14220067 (ISSN) , DOI 10.3390/ijms20184451
Аннотация: The current paper reviews the applications of luminescence bioassays for monitoring the results of low-intensity exposures which produce a stimulative effect. The impacts of radioactivity of different types (alpha, beta, and gamma) and bioactive compounds (humic substances and fullerenols) are under consideration. Bioassays based on luminous marine bacteria, their enzymes, and fluorescent coelenteramide-containing proteins were used to compare the results of the low-intensity exposures at the cellular, biochemical, and physicochemical levels, respectively. High rates of luminescence response can provide (1) a proper number of experimental results under comparable conditions and, therefore, proper statistical processing, with this being highly important for "noisy" low-intensity exposures; and (2) non-genetic, i.e., biochemical and physicochemical mechanisms of cellular response for short-term exposures. The results of cellular exposures were discussed in terms of the hormesis concept, which implies low-dose stimulation and high-dose inhibition of physiological functions. Dependencies of the luminescence response on the exposure time or intensity (radionuclide concentration/gamma radiation dose rate, concentration of the bioactive compounds) were analyzed and compared for bioassays of different organization levels.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zotina T. A., Trofimova E. A., Dementyev D. V.
Заглавие : Time-dependent trends of artificial radionuclides in biota of the Yenisei River (Siberia, Russia)
Место публикации : J. Environ. Radioact.: Elsevier Ltd, 2019. - Vol. 208-209. - Ст.106028. - ISSN 0265931X (ISSN) , DOI 10.1016/j.jenvrad.2019.106028
Аннотация: We investigated time-dependent trends of artificial radionuclides in aquatic moss, zoobenthos (amphipods and caddisfly larvae), and three abundant wild fish species (Northern pike, Arctic grayling, and Siberian dace) inhabiting the Yenisei River in the vicinity of the radioactive discharge site in 2007–2015, in a period before and after the shutdown of the last nuclear reactor plant at the Mining-and-Chemical Combine (MCC), which occurred in 2010. From our research, we learned that concentrations of short-lived radionuclides, whose discharges to the Yenisei either stopped or declined after the shutdown of the reactor plant at the MCC (24Na, 46Sc,51Cr, 54Mn, 58Co, 59Fe, 60Co, 65Zn, 103Ru, 141,144Ce, 152,154Eu, 239Np), decreased in biota samples as well. The ecological half-life (EHL) of 65Zn (0.4–0.7 y) was similar to the physical half-life of this isotope, the EHLs of 60Co (1.2–2.1 y) and 152Eu (1.8 y) were shorter than the physical half-lives of these isotopes. Concentration of 137Cs did not decrease significantly in biota of the Yenisei after the shutdown of the last reactor plant because the discharges of this radionuclide to the Yenisei continued at the same level. On a longer-term scale (since 1973 and since 1991), concentration of 137Cs in fish muscle had significantly decreased, following the decrease in annual discharges of this radionuclide to the Yenisei, and the EHL of 137Cs was estimated as 6.5–12.8 y. Statistically significant correlation with annual discharges of 137Cs was revealed for the concentration of this radionuclide in grayling (whole bodies and muscle); dace (muscle), and amphipods. Despite their ability to accumulate high concentrations of 137Cs, aquatic moss and caddisfly larvae (analyzed together with their stony casings) were not sensitive to interannual fluctuations in the releases of this radionuclide to the Yenisei. Among the analyzed fish species of the Yenisei, the highest activity concentration of 137Cs was revealed in pike (body and muscle), indicating biomagnification of this radionuclide in the top level of the trophic chain. © 2019 Elsevier Ltd
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Selivanova M.A., Rozhko T.V., Devyatlovskaya A.N., Kudryasheva N.S.
Заглавие : Comparison of chronic low-dose effects of alpha- and beta-emitting radionuclides on marine bacteria
Место публикации : Cent. Eur. J. Biol. - 2014. - Vol. 9, Is. 10. - С. 951-959. - ISSN 16443632 (ISSN) , DOI 10.2478/s11535-014-0331-0
Ключевые слова (''Своб.индексиров.''): am-241--hormesis--luminous bacteria--peroxides--radiotoxicity--tritium
Аннотация: Effects of Americium-241 (241Am), alpha-emitting radionuclide of high specific radioactivity, and tritium (3H), beta-emitting radionuclide, on luminous bacteria Photobacterium phosphoreum were compared. Bioluminescence intensity served as a marker of bacterial physiological activity. Three successive stages in the bioluminescence response to 241Am and 3H were found under conditions of lowdose irradiation: (1) absence of effects, (2) activation, and (3) inhibition. They were interpreted in terms of bacterial response to stressfactor as stress recognition, adaptive response/syndrome, and suppression of physiological function (i.e. radiation toxicity). Times of bioluminescence activation (TBA) and inhibition (TBI) were suggested as parameters to characterize hormesis and toxic stages in a course of chronic low-dose irradiation of the microorganisms. Values of TBA and TBI of 241Am were shorter than those of 3H, revealing higher impact of alpha-irradiation (as compared to beta-irradiation) under comparable radiation doses. Increases of peroxide concentration and NADH oxidation rates in 241Am aquatic solutions were demonstrated; these were not found in tritiated water. The results reveal a biological role of reactive oxygen species generated in water solutions as secondary products of the radioactive decay. The study provides a scientific basis for elaboration of bioluminescence-based assay to monitor radiotoxicity of alpha- and beta-emitting radionuclides in aquatic solutions. © 2014 Versita Warsaw and Springer-Verlag Wien.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Bolsunovsky A...
Заглавие : HOT PARTICLES IN THE FLOODPLAIN OF THE YENISEI RIVER
Место публикации : RADIOACTIVE PARTICLES IN THE ENVIRONMENT. Ser. NATO Science for Peace and Security Series C - Environmental Security: SPRINGER, 2009. - NATO Advanced Research Workshop on Hot Particles Released from Different Nuclear Sources (MAY 07-10, 2007, Yalta, UKRAINE). - С. 111-121. - 11. - ISBN 1871-4668, DOI 10.1007/978-90-481-2949-2_6. - ISBN 978-90-481-2947-8
Примечания : Cited References: 8
Предметные рубрики: RADIONUCLIDES
RUSSIA
Ключевые слова (''Своб.индексиров.''): hot particles--yenisei river--floodplain soils and sediments--plutonium complex--cesium and plutonium isotopes--(241)am--dating of particles
Аннотация: The purpose of this study was to investigate radionuclide composition of the hot particles found in the floodplain of the Yenisei River and to discuss their possible Sources. Since 1995, researchers of the Institute of Biophysics have found a considerable number of hot particles that contain up to 29,000 kBq/particle of (137)Cs in the Yenisei River floodplain. Investigations of the particles in Krasnoyarsk, Moscow, and Novosibirsk have confirmed their reactor origin and made it possible to roughly estimate their age. Based oil comparative analysis of (137)Cs/(134)Cs ratios, all the particles can be divided into two or three major groups, suggesting that over the 50-year period of the MCC operation, there have been two or three emergency situations at the MCC reactors, with nuclear fuel microparticles released into the Yenisei. Microparticles containing up to 36 Bq/particle of (241)Am were detected in soil and sediment samples collected at the Yenisei River. In some of these particles the (137)Cs/(241)Am ratio is high but in the others - low. It remains unknown how these particles have been formed. However, these microparticles Occur in floodplain soils and sediments very frequently and, thus, can be considered to be the main form in which radionuclides are present in the Yenisei River floodplain. The presence of a large number of hot particles of different origin in the floodplain of the Yenisei River from the MCC production area down to the town of Yeniseisk (and, probably, farther downstream) is a source of potential health hazard to people.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bolsunovsky A.Y., Tcherkezian V.O.
Заглавие : Hot particles of the Yenisei River flood plain, Russia
Колич.характеристики :8 с
Место публикации : J. Environ. Radioact.: ELSEVIER SCI LTD, 2001. - Vol. 57, Is. 3. - P167-174. - ISSN 0265-931X, DOI 10.1016/S0265-931X(01)00021-2
Примечания : Cited References: 12
Предметные рубрики: CONTAMINATION
CHERNOBYL
ACCIDENT
Ключевые слова (''Своб.индексиров.''): hot particles--yenisei river--plutonium complex--caesium and plutonium isotopes--dating of particles
Аннотация: Some high-activity hot particles (HP) were found in the flood plain of the Yenisei River, near the Krasnoyarsk Mining-and-Chemical Combine (MCC). and their radionuclide compositions were determined. The ratios of plutonium and caesium isotopes in the particles are indicative of their reactor origin. The Cs-137 activity of the particles amounts to 29,200 kBq/particle, which is higher than the corresponding activities of the fuel particles that formed as a result of the accident at the Chernobyl NPP, All the particles have been divided into two major groups according to the Cs-137/Cs-134 ratio: in the first group, the Cs-137/Cs-134 ratio is more than or equal to 3000, and in the second the Cs-137/Cs-134 ratio is less than or equal to 1000. The particles of the first and the second groups were preliminarily estimated to be formed 30 and 20 years ago, which suggests that there must have been at least two accidents at the MCC reactors, with part of the fuel released into the Yenisei River. (C) 2001 Elsevier Science Ltd. All rights reserved.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Rozhko T. V., Badun G. A., Razzhivina I. A., Guseynov O. A., Guseynova V. E., Kudryasheva N. S.
Заглавие : On the mechanism of biological activation by tritium
Место публикации : J. Environ. Radioact. - 2016. - Vol. 157. - С. 131-135. - ISSN 0265931X (ISSN) , DOI 10.1016/j.jenvrad.2016.03.017
Ключевые слова (''Своб.индексиров.''): dna mutations--low-dose effect--luminous marine bacteria--radiation hormesis--tritium
Аннотация: The mechanism of biological activation by beta-emitting radionuclide tritium was studied. Luminous marine bacteria were used as a bioassay to monitor the biological effect of tritium with luminescence intensity as the physiological parameter tested. Two different types of tritium sources were used: HTO molecules distributed regularly in the surrounding aqueous medium, and a solid source with tritium atoms fixed on its surface (tritium-labeled films, 0.11, 0.28, 0.91, and 2.36 MBq/cm2). When using the tritium-labeled films, tritium penetration into the cells was prevented. The both types of tritium sources revealed similar changes in the bacterial luminescence kinetics: a delay period followed by bioluminescence activation. No monotonic dependences of bioluminescence activation efficiency on specific radioactivities of the films were found. A 15-day exposure to tritiated water (100 MBq/L) did not reveal mutations in bacterial DNA. The results obtained give preference to a "non-genomic" mechanism of bioluminescence activation by tritium. An activation of the intracellular bioluminescence process develops without penetration of tritium atoms into the cells and can be caused by intensification of trans-membrane cellular processes stimulated by ionization and radiolysis of aqueous media. © 2016 Elsevier Ltd.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bolsunovsky A.Y., Bondareva L.G.
Заглавие : Tritium in surface waters of the Yenisei River basin
Колич.характеристики :10 с
Место публикации : J. Environ. Radioact.: ELSEVIER SCI LTD, 2003. - Vol. 66, Is. 3. - P285-294. - ISSN 0265-931X, DOI 10.1016/S0265-931X(02)00132-7
Примечания : Cited References: 11
Ключевые слова (''Своб.индексиров.''): tritium--yenisei river basin--surface and ground waters--nuclear reactor--deep-well injection of radionuclides
Аннотация: This paper reports an investigation of the tritium content in the surface waters of the Yenisei River basin near the Mining and Chemical Combine (MCC). In 2001 the maximum tritium concentration in the Yenisei River did not exceed 4 +/- 1 Bq l(-1), which is consistent with the data of 1998-99. However, it has been found that there are surface waters containing enhanced tritium as compared with the background values for the Yenisei River. For instance, in the Ploskii Stream and the Shumikha River the maximum tritium concentrations amount to 168 and 81 Bq l(-1), respectively. The source of tritium in these surface waters is the last operating reactor at the MCC, which still uses the Yenisei water as coolant. In water and sediment samples of the Bolshaya Tel River (a tributary of the Yenisei River) the tritium content turned out to be at least 10 times higher than the background values for the Yenisei River. The measurements conducted at the RPA RADON (Moscow) revealed not only tritium but also the artificial radionuclide C-14 in the Bolshaya Tel samples. The data obtained suggest that the Bolshaya Tel River receives the major part of tritium from sediments rather than from the water catchment area. This allows the conclusion that there is water exchange between the surface waters and the radioactively contaminated underground horizons of the "Severny" testing site. (C) 2002 Elsevier Science Ltd. All rights reserved.
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Rozhko, Tatiana V., Kolesnik, Olga V., Badun, Gennadii A., Stom, Devard I., Kudryasheva, Nadezhda S.
Заглавие : Humic Substances Mitigate the Impact of Tritium on Luminous Marine Bacteria. Involvement of Reactive Oxygen Species
Колич.характеристики :12 с
Коллективы : RFBR-Krasnoyarsk Regional Foundation [N 18-44-242002, 18-44-240004]
Место публикации : Int. J. Mol. Sci.: MDPI, 2020. - Vol. 21, Is. 18. - Ст.6783. - ISSN 1422-0067(eISSN), DOI 10.3390/ijms21186783
Примечания : Cited References:74. - This work was supported by RFBR-Krasnoyarsk Regional Foundation N 18-44-242002, 18-44-240004.
Предметные рубрики: IONIZING-RADIATION
OXIDATIVE STRESS
DETOXIFICATION PROCESSES
Аннотация: The paper studies the combined effects of beta-emitting radionuclide tritium and Humic Substances (HS) on the marine unicellular microorganism-luminous bacteria-under conditions of low-dose radiation exposures (0.04 Gy). Tritium was used as a component of tritiated water. Bacterial luminescence intensity was considered as a tested physiological parameter. The bioluminescence response of the marine bacteria to tritium corresponded to the "hormesis" model: it included stages of bioluminescence inhibition and activation, as well as the absence of the effect. HS were shown to decrease the inhibition and activation effects of tritium, similar to those of americium-241, alpha-emitting radionuclide, studied earlier. Correlations between the bioluminescence intensity and the content of Reactive Oxygen Species (ROS) were found in the radioactive bacterial suspensions. The results demonstrate an important role of HS in natural processes in the regions of low radioactive contamination: HS can mitigate radiotoxic effects and adaptive response of microorganisms to low-dose radioactive exposures. The involvement of ROS in these processes was demonstrated.
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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Rozhko T. V., Kolesnik O. V., Badun G. A., Stom D. I., Kudryasheva N. S.
Заглавие : Humic substances mitigate the impact of tritium on luminous marine bacteria. Involvement of reactive oxygen species
Место публикации : International Journal of Molecular Sciences: MDPI AG, 2020. - Vol. 21, Is. 18. - Ст.6783. - С. 1-12. - ISSN 16616596 (ISSN), DOI 10.3390/ijms21186783
Аннотация: The paper studies the combined effects of beta-emitting radionuclide tritium and Humic Substances (HS) on the marine unicellular microorganism—luminous bacteria—under conditions of low-dose radiation exposures (0.04 Gy). Tritium was used as a component of tritiated water. Bacterial luminescence intensity was considered as a tested physiological parameter. The bioluminescence response of the marine bacteria to tritium corresponded to the “hormesis” model: it included stages of bioluminescence inhibition and activation, as well as the absence of the effect. HS were shown to decrease the inhibition and activation effects of tritium, similar to those of americium-241, alpha-emitting radionuclide, studied earlier. Correlations between the bioluminescence intensity and the content of Reactive Oxygen Species (ROS) were found in the radioactive bacterial suspensions. The results demonstrate an important role of HS in natural processes in the regions of low radioactive contamination: HS can mitigate radiotoxic effects and adaptive response of microorganisms to low-dose radioactive exposures. The involvement of ROS in these processes was demonstrated. © 2020 by the authors. Licensee MDPI, Basel, Switzerland.
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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Rozhko T. V., Nemtseva E. V., Gardt M. V., Raikov A. V., Lisitsa A. E., Badun G. A., Kudryasheva N. S.
Заглавие : Enzymatic responses to low-intensity radiation of tritium
Место публикации : Int. J. Mol. Sci.: MDPI AG, 2020. - Vol. 21, Is. 22. - Ст.8464. - С. 1-15. - ISSN 16616596 (ISSN), DOI 10.3390/ijms21228464
Аннотация: The present study considers a possible role of enzymatic reactions in the adaptive response of cells to the beta-emitting radionuclide tritium under conditions of low-dose exposures. Effects of tritiated water (HTO) on the reactions of bacterial luciferase and NAD(P)H:FMN-oxidoreductase, as well as a coupled system of these two reactions, were studied at radioactivity concentrations ? 200 MBq/L. Additionally, one of the simplest enzymatic reactions, photobiochemical proton transfer in Coelenteramide-containing Fluorescent Protein (CLM-FP), was also investigated. We found that HTO increased the activity of NAD(P)H:FMN-oxidoreductase at the initial stage of its reaction (by up to 230%); however, a rise of luciferase activity was moderate (20%). The CLM-FP samples did not show any increase in the rate of the photobiochemical proton transfer under the exposure to HTO. The responses of the enzyme systems were compared to the ‘hormetic’ response of luminous marine bacterial cells studied earlier. We conclude that (1) the oxidoreductase reaction contributes significantly to the activation of the coupled enzyme system and bacterial cells by tritium, and (2) an increase in the organization level of biological systems promotes the hormesis phenomenon. © 2020 by the authors. Licensee MDPI, Basel, Switzerland.
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bolsunovsky, A. Ya., Dementyev D. V., Vakhrushev V. I.
Заглавие : Transport of Artificial Radionuclides over Long Distances Downstream along the Yenisei River during the 1966 Extreme Flood Event
Колич.характеристики :5 с
Коллективы : Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR) [18-44-240001]
Место публикации : Dokl. Earth Sci.: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2021. - Vol. 498, Is. 2. - С. 514-518. - ISSN 1028-334X, DOI 10.1134/S1028334X21060052. - ISSN 1531-8354(eISSN)
Примечания : Cited References:12. - This study was supported in part by the Russian Foundation for Basic Research, project no. 18-44-240001.
Предметные рубрики: SEDIMENTS
ELEMENTS
Аннотация: Long-term research has revealed layers with abnormally high concentrations of Cs-137 in bottom sediments and alluvial soils in the floodplain of the Yenisei River at various distances (as far as 820 km) downstream from the radioactive discharge point of the Mining-and-Chemical Combine (MCC) of Rosatom. The highest activity concentration of Cs-137 in these layers reached 26 000 Bq/kg, which was higher than the Cs-137 maximum at the well-known radioactive anomaly in the Yeniseisk riparian zone (330 km downstream from the MCC), which was formed during the 1966 extreme flood event. The radionuclide composition and the Cs-137/Eu-152 and Cs-137/Co-60 ratios in the anomalous layers studied were the same as those at the Yeniseisk anomalous site, suggesting that they had the same origin by the transport of sediments from the MCC area during the 1966 extreme flood event. The transport of radioactive bottom sediments over long distances from the MCC discharge point downstream along the Yenisei River during the 1966 extreme flood event may continue to pose a possible radiation hazard to the river ecosystem and residents of riverside villages.
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Rozhko, Tatiana V., Nemtseva, Elena V., Gardt, Maria V., Raikov, Alexander V., Lisitsa, Albert E., Badun, Gennadii A., Kudryasheva, Nadezhda S.
Заглавие : Enzymatic Responses to Low-Intensity Radiation of Tritium
Колич.характеристики :15 с
Коллективы : RFBR-Krasnoyarsk Regional Foundation [N 18-44-240004, 18-44-242002]
Место публикации : Int. J. Mol. Sci.: MDPI, 2020. - Vol. 21, Is. 22. - Ст.8464. - ISSN 1422-0067(eISSN), DOI 10.3390/ijms21228464
Примечания : Cited References:59. - This work was supported by RFBR-Krasnoyarsk Regional Foundation N 18-44-240004, 18-44-242002.
Предметные рубрики: LUMINOUS MARINE-BACTERIA
IONIZING-RADIATION
DISCHARGED-OBELIN
Аннотация: The present study considers a possible role of enzymatic reactions in the adaptive response of cells to the beta-emitting radionuclide tritium under conditions of low-dose exposures. Effects of tritiated water (HTO) on the reactions of bacterial luciferase and NAD(P)H:FMN-oxidoreductase, as well as a coupled system of these two reactions, were studied at radioactivity concentrations
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bolsunovsky, Alexander, Dementyev, Dmitry, Trofimova, Elena
Заглавие : Biomonitoring of radioactive contamination of the Yenisei River using aquatic plants
Колич.характеристики :12 с
Коллективы : Krasnoyarsk Regional Fund of Science - Russian Foundation for Basic Research [18-44-240001]
Место публикации : J. Environ. Radioact.: ELSEVIER SCI LTD, 2020. - Vol. 211. - Ст.106100. - ISSN 0265-931X, DOI 10.1016/j.jenvrad.2019.106100. - ISSN 1879-1700(eISSN)
Примечания : Cited References:39. - The authors are grateful to researchers T. Zotina, M. Medvedeva, A. Zueva, E. Iniatkina, and Yu. Kladko of the Institute of Biophysics SB RAS (Krasnoyarsk, Russia) for their assistance in collecting plant samples and conducting cytogenetic analysis. The study was partly supported by grant of the Krasnoyarsk Regional Fund of Science - Russian Foundation for Basic Research No. 18-44-240001.
Предметные рубрики: GAMMA-EMITTING RADIONUCLIDES
ELODEA-CANADENSIS
NONHUMAN BIOTA
Аннотация: The Yenisei River is contaminated by artificial radionuclides released by one of the Russian facilities producing weapons-grade plutonium (the Mining-and-Chemical Combine, MCC), which has been in operation for 60 years. The paper presents results of long-term monitoring of radionuclide concentrations in six aquatic plant species collected from the 1400 km Yenisei River stretch downstream of the city of Krasnoyarsk. Before the last MCC reactor was shut down (in 2010), up to 30 artificial radionuclides were detected in the plant biomass, and 2 and 5 years after the reactor shutdown, 11 and 3-5 radionuclides, respectively, were detected. The highest concentrations of radionuclides were recorded in Fontinalis antipyretica. The aquatic plant Elodea canadensis, which commonly occurs in the Yenisei River, was used in the cytogenetic study. High frequencies of chromosomal aberrations (up to 33%) were revealed in cells of Elodea canadensis roots from the Yenisei region affected by the MCC radioactive discharge, at dose rates of 45-72 mu Gy/d, while in the cells of the plant roots from the reference areas, the frequency of chromosomal aberrations was 5-7%, at dose rates below 2 mu Gy/d. The higher frequencies of chromosomal aberrations in Elodea canadensis collected from the parts of the River with increased concentrations of artificial radionuclides are associated with the radiation factor. The aquatic plant Elodea canadensis can be recommended as a bio-indicator for radioactively contaminated aquatic ecosystems.
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bolsunovsky A., Dementyev D., Trofimova E.
Заглавие : Biomonitoring of radioactive contamination of the Yenisei River using aquatic plants
Место публикации : J. Environ. Radioact.: Elsevier Ltd, 2020. - Vol. 211. - Ст.106100. - ISSN 0265931X (ISSN) , DOI 10.1016/j.jenvrad.2019.106100
Аннотация: The Yenisei River is contaminated by artificial radionuclides released by one of the Russian facilities producing weapons-grade plutonium (the Mining-and-Chemical Combine, MCC), which has been in operation for 60 years. The paper presents results of long-term monitoring of radionuclide concentrations in six aquatic plant species collected from the 1400 km Yenisei River stretch downstream of the city of Krasnoyarsk. Before the last MCC reactor was shut down (in 2010), up to 30 artificial radionuclides were detected in the plant biomass, and 2 and 5 years after the reactor shutdown, 11 and 3–5 radionuclides, respectively, were detected. The highest concentrations of radionuclides were recorded in Fontinalis antipyretica. The aquatic plant Elodea canadensis, which commonly occurs in the Yenisei River, was used in the cytogenetic study. High frequencies of chromosomal aberrations (up to 33%) were revealed in cells of Elodea canadensis roots from the Yenisei region affected by the MCC radioactive discharge, at dose rates of 45–72 ?Gy/d, while in the cells of the plant roots from the reference areas, the frequency of chromosomal aberrations was 5–7%, at dose rates below 2 ?Gy/d. The higher frequencies of chromosomal aberrations in Elodea canadensis collected from the parts of the River with increased concentrations of artificial radionuclides are associated with the radiation factor. The aquatic plant Elodea canadensis can be recommended as a bio-indicator for radioactively contaminated aquatic ecosystems. © 2019 Elsevier Ltd
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Dementyev, Dmitry, Bolsunovsky, Alexander
Заглавие : A long-term study of radionuclide concentrations in mushrooms in the 30-km zone around the Mining-and-Chemical Combine (Russia)
Колич.характеристики :10 с
Место публикации : Isot. Environ. Health Stud.: TAYLOR & FRANCIS LTD. - ISSN 1025-6016, DOI 10.1080/10256016.2020.1718124. - ISSN 1477-2639(eISSN)
Примечания : Cited References:25
Предметные рубрики: CS-137
FOREST
RADIOCESIUM
FUNGI
ACCUMULATION
ACCIDENT
Аннотация: Cs-137 concentrations were measured in mushrooms in an area affected by radioactive discharges of the Mining-and-Chemical Combine (MCC) (Rosatom, Russia) in 2002-2017. The sources of radionuclides in the study sites were global fallouts and waterborne and airborne radioactive discharges of the MCC. The mushroom species Suillus granulatus and S. luteus showed the highest Cs-137 concentrations (140-7100 Bq kg(-1)) for this area. Over the entire monitoring period, no significant change in Cs-137 concentration was observed in the Suillus spp. samples collected from the sites with the aerial deposition of radionuclides. In the floodplain site with the radionuclide deposition from water and air, a significant decrease in the average Cs-137 concentration was observed in the period between 2004 and 2017: a three-fold decrease in Suillus spp. and a nine-fold decrease in Lactarius deliciosus. The effective half-lives of Cs-137 in fruiting bodies of the mushrooms L. deliciosus and Suillus spp. in this site were 3.6 +/- 0.6 and 9.2 +/- 2.7 years, respectively.
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Darin A. V., Rogozin D. Y., Meydus A. V., Babich V. V., Kalugin I. A., Markovich T. I., Rakshun Y. V., Darin F. A., Sorokoletov D. S., Gogin A. A., Senin R. A., Degermendzhi A. G.
Заглавие : Traces of the Tunguska Event (1908) in Sediments of Zapovednoe Lake Based on SR–XRF Data
Место публикации : Dokl. Earth Sci.: Pleiades Publishing, 2020. - Vol. 492, Is. 2. - С. 442-445. - ISSN 1028334X (ISSN), DOI 10.1134/S1028334X20060045
Аннотация: Abstract: An anomalous layer enriched with chemical elements indicating the presence of terrigenous matter was discovered in the sediment core of Zapovednoe Lake located 60 km from the epicenter of the Tunguska event (1908) using synchrotron radiation X-ray fluorescence spectroscopy (SR–XRF). Radioisotope measurements indicate that the age of the layer is consistent with the date of the catastrophe. Apparently, the anomalous layer was formed as a result of an intense terrigenous matter inflow from the water catchment area due to massive forest falls and subsequent wildfires caused by the Tunguska event. Thus, it is established that targeted searches for microparticles of extraterrestrial origin can be carried out in the discovered and dated anomalous bottom sediment layer. © 2020, Pleiades Publishing, Ltd.
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Dementyev D., Bolsunovsky A.
Заглавие : A long-term study of radionuclide concentrations in mushrooms in the 30-km zone around the Mining-and-Chemical Combine (Russia)
Место публикации : Isot. Environ. Health Stud.: Taylor and Francis Ltd., 2020. - Article in press. - ISSN 10256016 (ISSN), DOI 10.1080/10256016.2020.1718124
Аннотация: 137Cs concentrations were measured in mushrooms in an area affected by radioactive discharges of the Mining-and-Chemical Combine (MCC) (Rosatom, Russia) in 2002–2017. The sources of radionuclides in the study sites were global fallouts and waterborne and airborne radioactive discharges of the MCC. The mushroom species Suillus granulatus and S. luteus showed the highest 137Cs concentrations (140–7100 Bq kg?1) for this area. Over the entire monitoring period, no significant change in 137Cs concentration was observed in the Suillus spp. samples collected from the sites with the aerial deposition of radionuclides. In the floodplain site with the radionuclide deposition from water and air, a significant decrease in the average 137Cs concentration was observed in the period between 2004 and 2017: a three-fold decrease in Suillus spp. and a nine-fold decrease in Lactarius deliciosus. The effective half-lives of 137Cs in fruiting bodies of the mushrooms L. deliciosus and Suillus spp. in this site were 3.6 ± 0.6 and 9.2 ± 2.7 years, respectively. © 2020, © 2020 Informa UK Limited, trading as Taylor & Francis Group.
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