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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : DEGERMENDZHI A.G., KOSOLAPOVA L.G.
Заглавие : THE THEORY OF EFFECT OF POLLUTANT AUTOSTABILIZATION AT RIVER ECOSYSTEM
Место публикации : Dokl. Akad. Nauk: MEZHDUNARODNAYA KNIGA, 1993. - Vol. 329, Is. 5. - С. 674-676. - 3. - ISSN 0869-5652
Примечания : Cited References: 9
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : GLADYSHEV M.I., GRIBOVSKAYA I.V., ADAMOVICH V.V.
Заглавие : DISAPPEARANCE OF PHENOL IN WATER SAMPLES TAKEN FROM THE YENISEI RIVER AND THE KRASNOYARSK RESERVOIR
Место публикации : Water Res.: PERGAMON-ELSEVIER SCIENCE LTD, 1993. - Vol. 27, Is. 6. - С. 1063-1070. - 8. - ISSN 0043-1354, DOI 10.1016/0043-1354(93)90071-O
Примечания : Cited References: 20
Предметные рубрики: ORGANIC-COMPOUNDS
LAKE WATER
MINERALIZATION
BIODEGRADATION
KINETICS
MODELS
Ключевые слова (''Своб.индексиров.''): biodegradation--phenol
Аннотация: Using experimental microecosystems the kinetics of phenol disappearance in river and reservoir water were investigated. In river water the disappearance kinetics could be described by A first-order equation, the same kinetics took place in reservoir water before and after the period of ''bloom'' of blue-green algae. During the ''bloom'', the phenol seemed to be mineralized by bacteria which grew at the expense of another compound, and the model of best fit was the model of exponential growth and low concentration of the test substrate. In the river, two sections differed according to the difference between the mean values of the specific disappearance rates. In the reservoir these rates were lower than those in the river. In general the specific disappearance rate values did not correlate with the values of initial bacterioplankton density, the concentrations of inorganic nutrients nor the chemical oxygen demand. Conclusions about the integral influence of ecosystems on the disappearance rates and dependence of self-purification kinetics on the type of aquatic ecosystem were made.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gitelson J.I.
Заглавие : Man-made closed ecosystems-instruments for future space exploration by man
Место публикации : SAE Technical Papers. - 1994. - 24th International Conference on Environmental Systems and 5th European Symposium on Space Environmental Control Systems (20 June 1994 through 23 June 1994, Friedrichshafen. - , DOI 10.4271/941611
Ключевые слова (''Своб.индексиров.''): human knowledge--international researches--long-term effects--low concentrations--russian academy of sciences--siberia--space explorations--space research--ecosystems
Аннотация: Artificial, closed ecosystems are potentially useful tools with which to explore ecosystem interactions, allowing investigations of the biology, physiology and biophysics of complex communities. They can also be used to evaluate the long-term effects of environmental constituents that are usually present at very low concentrations. The introduction of humans into such systems extends their usefulness even further, allowing the study of the influence of the environment on people, and the effects of people on the environment. Because of the great potential of such systems in adding to human knowledge, and their considerable expense, it is appropriate that such activities be international studies. The Institute of Biophysics of the Russian Academy of Sciences (Siberian Branch) has established, The International Research Center for Closed Ecosystems (Biospherics). It is located in Central Siberia near Krasnoyarsk on the Yenissei river, and is open to all interested investigators. В© Copyright 1994 Society of Automotive Engineers, Inc.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : GLADYSHEV M.I., GRIBOVSKAYA I.V.
Заглавие : PHENOL BIODEGRADATION IN THE YENISEI RIVER AND THE KRASNOYARSK RESERVOIR, RUSSIA
Колич.характеристики :5 с
Место публикации : HYDROLOGICAL, CHEMICAL AND BIOLOGICAL PROCESSES OF TRANSFORMATION AND TRANSPORT OF CONTAMINANTS IN AQUATIC ENVIRONMENTS. Ser. IAHS PUBLICATIONS: INT ASSOC HYDROLOGICAL SCIENCES, 1994. - Hydrochemistry 1993 Symposium on Hydrological, Chemical and Biological Processes of Transformation and Transport of Contaminants in Aquatic Environments (MAY 24-28, 1993, ROSTOV NA DONU, RUSSIA), Is. 219. - P217-221. - ISBN 0144-7815. - ISBN 0-947571-88-4
Примечания : Cited References: 0
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sid'ko F.Ya., Aponasenko A.D., Filimonov V.S., Lopatin V.N., Sid'ko A.F.
Заглавие : The dissolved "yellow" matter as a natural indicator in hydrological investigations
Место публикации : Water Resources. - 1996. - Vol. 23, Is. 1. - С. 111-114. - ISSN 00978078 (ISSN)
Аннотация: The proportions of spectral indices of light absorption by water, dissolved "yellow" matter, phytoplankton pigments, and other suspended hydrosol particles contained in the water of Enisei River and Krasnoyarsk Reservoir were experimentally estimated. An optical method for determination of relative content and spatial distribution of water masses of mixing currents was proposed. В© 1996 MAHK Hayka/Interperiodica Publishing.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Degermendzhy N.N., Kosolapova L.G.
Заглавие : Theory and software of ecological-economical optimization of river water use
Колич.характеристики :8 с
Место публикации : COMPUTATIONAL METHODS IN WATER RESOURCES XI, VOL 2: COMPUTATIONAL METHODS IN SURFACE FLOW AND TRANSPORT PROBLEMS: COMPUTATIONAL MECHANICS PUBLICATIONS LTD, 1996. - 11th International Conference on Computational Methods in Water Resources (CMWR 96) (JUL, 1996, CANCUN, MEXICO). - P453-460. - ISBN 1-85312-487-7
Примечания : Cited References: 0
Ключевые слова (''Своб.индексиров.''): mathematical model--preparation of water--self-purification--optimization
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Degermendzhy A.G., Kosolapova L.G., Vlasik P.V.
Заглавие : Theory, computational method and software for prognosis of migration and distribution of radioactive matters in river ecosystem
Место публикации : COMPUTATIONAL METHODS IN WATER RESOURCES XI, VOL 2: COMPUTATIONAL METHODS IN SURFACE FLOW AND TRANSPORT PROBLEMS: COMPUTATIONAL MECHANICS PUBLICATIONS LTD, 1996. - 11th International Conference on Computational Methods in Water Resources (CMWR 96) (JUL, 1996, CANCUN, MEXICO). - С. 277-284. - 8. - ISBN 1-85312-487-7
Примечания : Cited References: 0
Ключевые слова (''Своб.индексиров.''): mathematical modelling--migration of radionuclides--river ecosystem
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Degermendzhi A.G., Kosolapova L.G.
Заглавие : Mathematical model of ecological mechanism of radionuclid spatial heterogeneity in river system water-phytoplankton-zooplankton-botton sediment
Место публикации : Dokl. Akad. Nauk: MEZHDUNARODNAYA KNIGA, 1997. - Vol. 354, Is. 1. - С. 131-134. - 4. - ISSN 0869-5652
Примечания : Cited References: 7
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Kuznetsov A.M., Rodicheva E.K., Medvedeva S.E.
Заглавие : Biotesting of sewage and river water by liofilyzed luminous bacteria biotest
Колич.характеристики :5 с
Место публикации : FIELD SCREENING EUROPE: SPRINGER, 1997. - 1st International Conference on Field Screening Europe - Strategies and Techniques for On-Site Investigation and Monitoring of Contaminated Soil, Water and Air (SEP 29-OCT 01, 1997, KARLSRUHE, GERMANY). - P211-215. - ISBN 0-7923-4782-X
Примечания : Cited References: 0
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10.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Degermendzhy A.G., Kosolapova L.G.
Заглавие : Mathematical theory of new ecological mechanism of formation of spatial distribution of radionuclides in river ecosystem
Место публикации : INTERNATIONAL CONFERENCE ON NUCLEAR DATA FOR SCIENCE AND TECHNOLOGY, VOL 59, PT 1 AND 2. Ser. SOCIETA ITALIANA DI FISICA : CONFERENCE PROCEEDINGS: SOC ITALIANA FISICA, 1997. - Vol. 59: International Conference on Nuclear Data for Science and Technology (MAY 19-24, 1997, TRIESTE, ITALY). - С. 1373-1375. - 3. - ISBN 1122-1437. - ISBN 88-7794-114-6
Примечания : Cited References: 0
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bolsunovskii A.Y., Goryachenkova T.A., Cherkezyan V.O., Myasoedov B.F.
Заглавие : Hot particles in the Krasnoyarsk Krai
Место публикации : Radiochemistry: MAIK NAUKA/INTERPERIODICA, 1998. - Vol. 40, Is. 3. - С. 278-281. - 4. - ISSN 1066-3622
Примечания : Cited References: 22
Предметные рубрики: CHERNOBYL
ACCIDENT
RADIONUCLIDES
Аннотация: The radionuclidic composition of several high-level hot particles (PIP) found during field work in the region of the Atamanovskii island of the Yenisei river just near the Krasnoyarsk Mining Chemical Plant (MCP) was determined. The activity ratios of Pu and Cs isotopes in these particles revealed their reactor origin. The age of HPs was estimated in terms of one possible pathway of their formation.
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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kuznetsov A.M., Rodicheva E.K., Medvedeva S.E.
Заглавие : Biotesting of Effluent and River Water by Lyophilized Luminous Bacteria Biotest
Место публикации : Field Analytical Chemistry and Technology. - 1998. - Vol. 2, Is. 5. - С. 267-275. - ISSN 1086900X (ISSN)
Ключевые слова (''Своб.индексиров.''): bioluminescence--effluent--luminous bacteria biotest--toxicity--water quality
Аннотация: Waters of the Yenisei River, certain rivers and lakes of the Altai Territory, and effluents of some industrial factories in Krasnoyarsk were studied by luminous bacteria biotest Microbiosensor B17 677F. The lyophilized luminous bacteria Photobacterium phosphoreum from the IBSO collection were used to design this biotest. The bioluminescent test is based on bioluminescence quenching resulting from the action of water samples on luminous bacteria. The test results indicated locations and zones of impaired water quality. The heaviest pollution of water in the Yenisei River was recorded in the zones 0-116 km downstream from Krasnoyarsk (Krasnoyarsk and satellite towns). The effluents of most factories were found to be toxic. Underground and surface waters of some areas of the Altai Territory had different toxicity levels; there were deviations from the norm in most water samples taken from the different lakes and rivers. The data from this study show that the luminous bacteria biotest is simple and convenient, and that the results obtained are within acceptable levels of accuracy for the evaluation of the toxicity of effluent and river water. It takes no more than 30 min to do the biotest. It can be used in ecological monitoring like the Microtox toxicity test. В© 1998 John Wiley & Sons, Inc.
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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kuznetsov A.M., Rodicheva E.K., Medvedeva S.E.
Заглавие : Analysis of river water by bioluminescent biotests
Место публикации : Luminescence. - 1999. - Vol. 14, Is. 5. - С. 263-265. - ISSN 15227235 (ISSN)
Ключевые слова (''Своб.индексиров.''): bioluminescent bioassay--pollution--water quality--fresh water--article--bioassay--escherichia coli--freeze drying--genetic procedures--luminescence--methodology--photobacterium--russian federation--sensitivity and specificity--water pollutant--biological assay--biosensing techniques--escherichia coli--freeze drying--fresh water--luminescence--photobacterium--russia--sensitivity and specificity--water pollutants, chemical
Аннотация: The bacterial bioluminescence has high sensitivity to the action of various inhibitors of biological activity. The lyophilized luminous bacteria Photobacterium phosphoreum (Microbiosensor B17 677F) and luminous strain Escherichia coli (Microbiosensor EC) from the Culture Collection IBSO were used to create bioluminescent biotests. They have been applied in ecological monitoring to determine the overall toxicity of the Yenisei and Angara Rivers and some water sources of Altai Territory. As a rule the heaviest pollution of water in studied rivers was registered near cities and settlements. The luminous bacteria biotests are simple and convenient in work, standardized and quantitative, have rapid response to actions of different substances and high sensitivity to environmental pollutants. It takes less than 30 min to do the biotest (the other biotests take 48-96 h). Copyright В© 1999 John Wiley & Sons, Ltd.
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bolsunovskii A.Y., Aturova V.P., Burger M..., Schmid E..., Astner M..., Brunner B..., Degermendzhi A.G., Kovalenko V.V., Kurkatov S.V.
Заглавие : Radioactive contamination of populated areas of the Krasnoyarsk krai in the region of location of the Mining-Chemical Combine
Место публикации : Radiochemistry: MAIK NAUKA/INTERPERIODICA/SPRINGER, 1999. - Vol. 41, Is. 6. - С. 604-609. - 6. - ISSN 1066-3622
Примечания : Cited References: 6
Аннотация: Radionuclide content in soil samples collected from populated areas of the Krasnoyarsk krai in the region of location of the Mining-Chemical Combine (MCC), RF Ministry of Nuclear Power Engineering (Minatom), Zheleznogorsk, is determined. The samples were analyzed in the State Sanitary Epidemiological Inspection Center of the Krasnoyarsk krai (Krasnoyarsk, Russia) and analytical and Radiochemical Laboratory (Spiez, Switzerland). In the soil samples collected from the areas that are not subject to the impact of MCC (due to contaminated water discharge and airborne effluents) the maximal content of the most radiologically significant technogenic radionuclide Cs-137 was found to be 45 Bq/kg, which does not exceed the global level: In flood land it amounts to 631 Bq/kg, and the absolutely maximal content (6507 Bq/kg) was found in the samples collected at a depth of 50-80 cm from the Gorodskoi Isl. near the Yeniseisk town. The Pu-239,Pu-240 content in top horizons of soil outside the MCC impact zone ranges from 0.2 to 0.6 Bq/kg. In the flood areas of populated localities at the Yenisei River the Pu-239,Pu-240 content increases to 3.2 Bq/kg in top horizons and more significantly in deeper horizons. The maximal Pu-239,Pu-240 content (8-10 and 10.6-28.9 Bq/kg determined by the Russian and Swiss Researchers, respectively) is found in the samples collected from Yeniseisk at a depth of 50-80 cm. These results suggest that Pu is supplied from MCC to the flood areas of populated localities with the river water. An increased Pu-239,Pu-240 content was also found in soil samples collected from the free-fall areas of the Atamanovo and Bol'shoi Balchug settlements located near the MCC sanitary zone.
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15.

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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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gladyshev M.I., Gribovskaya I.V., Moskvicheva A.V., Muchkina E.Y., Chuprov S.M., Ivanova E.A.
Заглавие : Content of metals in compartments of ecosystem of a Siberian pond
Колич.характеристики :6 с
Место публикации : Arch. Environ. Contam. Toxicol.: SPRINGER-VERLAG, 2001. - Vol. 41, Is. 2. - P157-162. - ISSN 0090-4341
Примечания : Cited References: 26
Предметные рубрики: CHIRONOMUS-RIPARIUS MEIGEN
NELSON RIVER SYSTEM
AQUATIC MACROPHYTES
LARVAE DIPTERA
HEAVY-METAL
COPPER
LEAD
SEDIMENTS
CADMIUM
MANITOBA
Аннотация: During three field seasons (June-September) of 1997-99 contents of Na, K, Ca, Mg, Fe, Mn, Zn, Cu, Al, Cr, Ni, Cd, and Pb were determined in compartments of ecosystem (surrounding soils, bottom sediments, water, zoobenthos, macrophytes, and fish) of a fish and recreation pond situated at the edge of Krasnoyarsk City (Siberia, Russia). Contents of most parts of metals in soils, water, and macrophytes significantly correlated with each other. As concluded, their contents were determined by natural, general, geochemical peculiarities of the region. Heavy metals, contents of which were higher than federal upper limits of concentration, were revealed. In muscles of fish with different feeding spectra-crucian and perch-concentrations of some metals differed significantly; correlation graphs for metals also had different structures. Comparison of our data with those on diverse aquatic ecosystems of Siberia, Europe, North America, and China published in the last decade was carried out. It was concluded that a distribution of heavy metals in the compartments of an aquatic ecosystem presently have to be determined for each particular water body until general regularities are discovered.
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bolsunovskij A.Ya., Kosinenko S.V.
Заглавие : Experimental investigations of the intensity of phosphorus radionuclide uptake by samples of algobacterial community of the Yenisei River
Место публикации : Radiatsionnaya Biologiya. Radioekologiya. - 2001. - Vol. 41, Is. 1. - С. 119-123. - ISSN 08698031 (ISSN)
Ключевые слова (''Своб.индексиров.''): phosphorus--alga--article--bacterium--microbiology--radiation exposure--russian federation--water pollution--algae--bacteria--phosphorus radioisotopes--siberia--water microbiology--water pollution, radioactive--algae--ecosystems--phosphorus--radioactivity--radioisotopes--river pollution--algobacterial community--radioecological concentration--yenisei river--biological radiation effects
Аннотация: The experiments in which phosphorus radionuclide was added to samples of algobacterial community of the Yenisei River taken near the production area of the Mining-and-Chemical Combine (Zheleznogorsk) made possible determining the uptake rates and coefficients of radionuclide accumulation by microorganisms. Radios between processes of adsorption and accumulation of phosphorus radionuclide by components of water seston (suspended matter) have been determined. The portion of the specific radioactivity of phosphorus adsorbed by unit mass of seston (and algae) has been found to be not more than 7% of the activity accumulated by algal cells.
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bolsunovskij A.Ya., Ermakov A.I., Burger M., Degermendzhy A.G., Sobolev A.I.
Заглавие : Accumulation of artificial radionuclides by the Yenisei river aquatic plants in the area affected by the activity of the Mining-and-Chemical Combine
Место публикации : Radiatsionnaya Biologiya. Radioekologiya. - 2002. - Vol. 42, Is. 2. - С. 194-199. - ISSN 08698031 (ISSN)
Ключевые слова (''Своб.индексиров.''): contamination--ecosystems--environmental impact--gamma ray spectrometers--radioisotopes--river pollution--radioecological concentration--radioisotope accumulation--the yenisei river--ecology--plutonium--radioisotope--strontium--article--chemical industry--chemistry--comparative study--gamma spectrometry--industrial waste--mining--nuclear reactor--plant--radiochemistry--russian federation--water pollutant--chemical industry--industrial waste--mining--nuclear reactors--plants--plutonium--radiochemistry--radioisotopes--siberia--spectrometry, gamma--strontium radioisotopes--water pollutants, radioactive
Аннотация: The aim of the paper is to investigate accumulation of artificial radionuclides by the Yenisei river aquatic plants collected in the area affected by the activity of the Mining-and-Chemical Combine (Zheleznogorsk) from 1997 to 2000. The samples of aquatic plants were of four species: Potamogeton lucens, Fontinalis antipyretica, Elodea canadensis, and Ceratophyllum demersum. The gamma-spectrometric analysis of the samples of aquatic plants for artificial radionuclides revealed a wide spectrum of radionuclides. Radionuclides of activation origin were found in the aquatic plants taken both near the Combine and 200 km down of it. The radiochemical analysis of aquatic plants revealed strontium and plutonium isotopes. Among the aquatic plants, the highest concentration factors for the principal radionuclides were recorded in Fontinalis antipyretica (water moss).
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Degermendzhi A.G., Kosolapova L.G., Belolipetskij V.M.
Заглавие : Predictive radioecological mathematical model of the Yenisei river
Место публикации : Radiatsionnaya Biologiya. Radioekologiya. - 2002. - Vol. 42, Is. 4. - С. 433-439. - ISSN 08698031 (ISSN)
Ключевые слова (''Своб.индексиров.''): cesium--contamination--mathematical models--phosphorus--radioisotopes--river pollution--cesium 137--phosphorus 32--radioecology--the yenisei river--ecosystems--bacteria (microorganisms)--fresh water--article--ecosystem--pollutant--russian federation--theoretical model--ecosystem--fresh water--models, theoretical--radioactive pollutants--russia
Аннотация: A one-dimensional mathematical model of the Yenisei river ecosystem including hydrological, ecosystem and radioecologicl blocks has been developed. The model was used to evaluate contribution of different processes (transfer by water masses, dilution, radioactive decay, bioaccumulation) into self-purification of the river water from a radiation pollution. The pollution density of ecosystem components (bacteria, phyto-, zooplankton, phyto-, zoobenthos, detritus) with 137Cs and 32P is calculated.
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Trusova M.Y., Gladyshev M.I.
Заглавие : Phylogenetic diversity of winter bacterioplankton of eutrophic Siberian reservoirs as revealed by 16S rRNA gene sequences
Колич.характеристики :8 с
Место публикации : Microb. Ecol.: SPRINGER-VERLAG, 2002. - Vol. 44, Is. 3. - P252-259. - ISSN 0095-3628, DOI 10.1007/s00248-002-2020-1
Примечания : Cited References: 34
Предметные рубрики: RIBOSOMAL-RNA ANALYSIS
COMMUNITY COMPOSITION
BACTERIAL DIVERSITY
LAKE
IDENTIFICATION
BIODIVERSITY
CULTIVATION
TAXONOMY
DYNAMICS
RIVER
Аннотация: Using 16S rRNA gene sequence analyses we investigated the bacterial diversity of winter bacterioplankton of two eutrophic Siberian reservoirs. These reservoirs show similarity in phytoplankton community composition in spring and autumn but tend to differ in summer in exhibiting cyanobacterial bloom. Forty-eight unique partial 16S RNA gene sequences retrieved from two libraries were mostly affiliated with the class Actinobacteria, beta subdivision of the class Proteobacteria, and the phylum Cytophaga-Flavobacterium-Bacteroides The clone library of the pond exhibiting summer cyanobacterial bloom showed more diversity in sequence composition. A significant number of bacterial 16S rRNA gene clones were closely related to freshwater bacteria previously found in different aquatic ecosystems. This finding confirms the assumption that some bacterial clades are globally distributed.
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