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Microbiological and isotopic-geochemical investigations of meromictic lakes in Khakasia in winter / A. S. Savvichev [и др.] // Mikrobiologiya. - 2005. - Vol. 74, Is. 4. - С. 552-561 . - ISSN 0026-3656
Кл.слова (ненормированные):
Meromictic water bodies -- Microbial production and oxidation of methane -- Photosynthesis -- Stable isotopes of carbon (? 13C) and sulfur (? 34S) -- Sulfate reduction -- Bacteria (microorganisms) -- Chlorobi -- Chromatiaceae -- Lamprocystis purpurea -- Pelodictyon luteolum -- Photobacteria -- carbon -- fresh water -- methane -- sulfate -- sulfur -- article -- bacterial phenomena and functions -- bacterium -- comparative study -- isolation and purification -- metabolism -- microbiology -- oxidation reduction reaction -- photosynthesis -- Russian Federation -- season -- species difference -- Bacteria -- Bacterial Physiology -- Carbon Isotopes -- Fresh Water -- Methane -- Oxidation-Reduction -- Photosynthesis -- Seasons -- Siberia -- Species Specificity -- Sulfates -- Sulfur Isotopes -- Water Microbiology
Аннотация: Microbiological and isotopic-geochemical investigations of the brackish meromictic lakes Shira and Shunet were performed in the steppe region of Khakasia in winter. Measurements made with a submersed sensor demonstrated that one-meter ice transmits light in a quantity sufficient for oxygenic and anoxygenic photosynthesis. As in the summer season, in the community of phototrophic bacteria found in Lake Shira, the purple sulfur bacteria Amoebobacter purpureus dominated, whereas, in Lake Shunet, the green sulfur bacteria Pelodictyon luteolum were predominant. Photosynthetic production, measured using the radioisotopic method, was several times lower than that in summer. The rates of sulfate reduction and production and oxidation of methane in the water column and bottom sediments were also lower than those recorded in summer. The process of anaerobic methane oxidation in the sediments was an exception, being more intense in winter than in summer. The data from radioisotopic measurements of the rates of microbial processes correlate well with the results of determination of the isotopic composition of organic and mineral carbon (? 13C) and hydrogen sulfide and sulfate (? 34S) and suggest considerable seasonal variations in the activity of the microbial community in the water bodies investigated.

Scopus
Держатели документа:
Winogradsky Institute of Microbiology, Russian Academy of Sciences, pr. 60-letiya Oktyabrya, Moscow, 117811, Russian Federation
Institute of Biophysics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk 36, 660036, Russian Federation : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Savvichev, A.S.; Rusanov, I.I.; Rogozin, D.Yu.; Zakharova, E.E.; Lunina, O.N.; Bryantseva, I.A.; Yusupov, S.K.; Pimenov, N.V.; Degermendzhi, A.G.; Ivanov, M.V.

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Microbiological and isotopic-geochemical investigations of meromictic lakes in Khakasia in winter / A. S. Savvichev [et al.] // Microbiology. - 2005. - Vol. 74, Is. 4. - P477-485, DOI 10.1007/s11021-005-0092-x . - ISSN 0026-2617
Кл.слова (ненормированные):
Meromictic water bodies -- Microbial production and oxidation of methane -- Photosynthesis -- Stable isotopes of carbon (?13C) and sulfur (?34S) -- Sulfate reduction -- Chlorobi -- Chromatiaceae -- Lamprocystis purpurea -- Pelodictyon luteolum -- Photobacteria
Аннотация: Microbiological and isotopic-geochemical investigations of the brackish meromictic lakes Shira and Shunet were performed in the steppe region of Khakasia in winter. Measurements made with a submersed sensor demonstrated that one-meter ice transmits light in a quantity sufficient for oxygenic and anoxygenic photosynthesis. As in the summer season, in the community of phototrophic bacteria found in Lake Shira, the purple sulfur bacteria Amoebobacter purpureus dominated, whereas, in Lake Shunet, the green sulfur bacteria Pelodictyon luteolum were predominant. Photosynthetic production, measured using the radioisotopic method, was several times lower than that in summer. The rates of sulfate reduction and production and oxidation of methane in the water column and bottom sediments were also lower than those recorded in summer. The process of anaerobic methane oxidation in the sediments was an exception, being more intense in winter than in summer. The data from radioisotopic measurements of the rates of microbial processes correlate well with the results of determination of the isotopic composition of organic and mineral carbon (?13C) and hydrogen sulfide and sulfate (?34S) and suggest considerable seasonal variations in the activity of the microbial community in the water bodies investigated. В© 2005 Pleiades Publishing, Inc.

Scopus
Держатели документа:
Winogradsky Institute of Microbiology, Russian Academy of Sciences, pr. 60-letiya Oktyabrya, Moscow, 117312, Russian Federation
Institute of Biophysics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk 36, 660036, Russian Federation : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Savvichev, A.S.; Rusanov, I.I.; Rogozin, D.Yu.; Zakharova, E.E.; Lunina, O.N.; Bryantseva, I.A.; Yusupov, S.K.; Pimenov, N.V.; Degermendzhi, A.G.; Ivanov, M.V.

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Effect of winter conditions on distributions of anoxic phototrophic bacteria in two meromictic lakes in Siberia, Russia / D. Y. Rogozin [et al.] // Aquatic Ecology. - 2009. - Vol. 43, Is. 3. - P661-672, DOI 10.1007/s10452-009-9270-7 . - ISSN 1386-2588
Кл.слова (ненормированные):
Chemocline -- Green sulphur bacteria -- Purple sulphur bacteria -- Snow -- Winter -- anoxic conditions -- bacterium -- biomass -- ice cover -- light intensity -- meromictic lake -- photoautotrophy -- remote sensing -- vertical distribution -- Eurasia -- Khakassia -- Lake Shira -- Lake Shunet -- Russian Federation -- Siberia -- Bacteria (microorganisms) -- Photobacteria
Аннотация: The year-to-year variations of vertical distribution and biomass of anoxic phototrophic bacteria were studied during ice periods 2003-2005 and 2007-2008 in meromictic lakes Shira and Shunet (Southern Siberia, Russian Federation). The bacterial layers in chemocline of both lakes were sampled with a thin-layer hydraulic multi-syringe sampler. In winter, biomass of purple sulphur bacteria varied considerably depending on the amount of light penetrating into the chemocline through the ice and snow cover. In relatively weakly stratified, brackish Shira Lake, the depth of chemocline varied between winters, so that light intensity for purple sulphur bacteria inhabiting this zone differed. In Shira Lake, increased transparency of mixolimnion in winter, high chemocline position and absence of snow resulted in light intensity and biomass of purple sulphur bacteria exceeding the summer values in the chemocline of the lake. We could monitor snow cover at the lake surface using remote sensing and therefore estimate dynamics and amount of light under ice and its availability for phototrophic organisms. In Shunet Lake, the light intensities in the chemocline and biomasses of purple sulphur bacteria were always lower in winter than in summer, but the biomasses of green sulphur bacteria were similar. В© Springer Science+Business Media B.V. 2009.

Scopus
Держатели документа:
Institute of Biophysics of Siberian Branch of Russian Academy of Sciences, Akademgorodok 50-50, 660036 Krasnoyarsk, Russian Federation
Siberian Federal University, Svobodny 79, 660071 Krasnoyarsk, Russian Federation
Center for Limnology, The Netherlands Institute of Ecology, Nieuwersluis, Netherlands : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Rogozin, D.Y.; Zykov, V.V.; Chernetsky, M.Y.; Degermendzhy, A.G.; Gulati, R.D.

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Anoxygenic phototrophic bacteria in meromictic lakes of southern Siberia during the ice period: Spatial distributions and ecological conditions / D. Yu. Rogozin [et al.] // Doklady Biological Sciences. - 2009. - Vol. 424, Is. 1. - P63-67, DOI 10.1134/S0012496609010190 . - ISSN 0012-4966
Кл.слова (ненормированные):
fresh water -- anaerobic growth -- article -- environmental aspects and related phenomena -- history -- ice cover -- microbiology -- phototrophy -- Russian Federation -- season -- Anaerobiosis -- Ecological and Environmental Phenomena -- Fresh Water -- History, Ancient -- Ice Cover -- Phototrophic Processes -- Seasons -- Siberia -- Photobacteria

Scopus
Держатели документа:
Institute of Biophysics, Siberian Branch, Russian Academy of Sciences, Akademgorodok 50, Krasnoyarsk 660036, Russian Federation
Siberian Federal University, Svobodnyi pr. 79, Krasnoyarsk 66041, Russian Federation : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Rogozin, D.Yu.; Zykov, V.V.; Chernetskii, M.Yu.; Degermendzhy, A.G.

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Anoxygenic phototrophic bacterial community of Lake Shira (Khakassia) / O. N. Lunina [et al.] // Microbiology. - 2007. - Vol. 76, Is. 4. - P469-479, DOI 10.1134/S0026261707040133 . - ISSN 0026-2617
Кл.слова (ненормированные):
Anoxygenic photosynthesis -- Anoxygenic phototrophic bacteria -- Meromictic brackish lakes -- Ahrensia kielensis -- Bacteria (microorganisms) -- Chlorobi -- Chlorobium -- Chlorobium limicola -- Chromatiaceae -- Lamprocystis purpurea -- Photobacteria -- Proteobacteria -- Rhodomicrobium -- Rhodovulum -- Rhodovulum strictum -- Thiocapsa roseopersicina
Аннотация: The anoxygenic phototrophic bacterial community of the brackish meromictic Lake Shira (Khakassia) was investigated in August 2001, July 2002, and February-March 2003. In all the periods of investigation, the prevailing microorganisms were purple sulfur bacteria similar to Lamprocystis purpurea in morphology and pigment composition. Their highest number (3 ? 10 5 cells/ml) was recorded in July 2002 at the depth of 15 m. According to 16S rRNA gene analysis, the strain of purple sulfur bacteria isolated in 2001 and designated ShAm01 exhibited 98.6% similarity to the type strain of Thiocapsa roseopersicina and 97.1-94.4% similarity to the type strains of Tca. pendens, Tca. litoralis, and Tca. rosea. The minor microorganisms of the anoxygenic phototrophic bacterial community within the period of investigation were nonsulfur purple bacteria phylogenetically close to Rhodovulum strictum (98.3% similarity, strain ShRb01), Ahrensia kielensis (of 93.9% similarity, strain ShRb02), Rhodomicrobium vannieli (of 99.7% similarity, strain ShRmc01), and green sulfur bacteria, phylogenetically close to Chlorobium limicola (of 98.7% similarity, strain ShCl03). В© 2007 Pleiades Publishing, Ltd.

Scopus
Держатели документа:
Winogradsky Institute of Microbiology, Russian Academy of Sciences, pr. 60-letiya Oktyabrya 7, k. 2, Moscow, 117312, Russian Federation
Skryabin Institute of Microbial Biochemistry and Physiology, Russian Academy of Sciences, Pushchino
Institute of Biophysics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Lunina, O.N.; Bryantseva, I.A.; Akimov, V.N.; Rusanov, I.I.; Barinova, E.S.; Lysenko, A.M.; Rogozin, D.Yu.; Pimenov, N.V.

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Seasonal changes in the structure of the anoxygenic photosynthetic bacterial community in Lake Shunet, Khakassia / O. N. Lunina [et al.] // Microbiology. - 2007. - Vol. 76, Is. 3. - P368-379, DOI 10.1134/S0026261707030149 . - ISSN 0026-2617
Кл.слова (ненормированные):
Anoxygenic photosynthesis -- Eutrophic meromictic saline lakes -- Green sulfur phototrophic bacteria -- Purple nonsulfur phototrophic bacteria -- Purple sulfur phototrophic bacteria -- Bacteria (microorganisms) -- Chlorobi -- Chromatiaceae -- Halochromatium -- Photobacteria -- Prosthecochloris vibrioformis -- Proteobacteria -- Rhodospirillaceae -- Rhodovulum -- Rhodovulum euryhalinum -- Thiocapsa
Аннотация: Seasonal studies of the anoxygenic phototrophic bacterial community of the water column of the saline eutrophic meromictic Lake Shunet (Khakassia) were performed in 2002 (June) and 2003 (February-March and August). From the redox zone down, the lake water was of dark green color. Green sulfur bacteria predominated in every season. The maximum number of green sulfur bacteria was 107 cells/ml in summer and 106 cells/ml in winter. A multi-syringe stratification sampler was applied for the study of the fine vertical distribution of phototrophs in August 2003; the sampling was performed every 5 cm. A 5-cm-thick pink-colored water layer inhabited by purple sulfur bacteria was shown to be located above the layer of green bacteria. The species composition and ratio of purple bacterial species depended on the sampling depth and on the season. In summer, the number of purple sulfur bacteria in the layer of pink water was 1.6 ? 108 cells/ml. Their number in winter was 3 ? 105 cells/ml. In the upper oxygen-containing layer of the chemocline the cells of purple nonsulfur bacteria were detected in summer. The maximum number of nonsulfur purple bacteria, 5 ? 102 cells/ml, was recorded in August 2003. According to the results of the phylogenetic analysis of pure cultures of the isolated phototrophic bacteria, which were based on 16S rDNA sequencing, green sulfur bacteria were close to Prosthecochloris vibrioformis, purple sulfur bacteria, to Thiocapsa and Halochromatium species, and purple nonsulfur bacteria, to Rhodovulum euryhalinum and Pinkicyclus mahoneyensis. В© Nauka/Interperiodica 2007.

Scopus
Держатели документа:
Winogradsky Institute of Microbiology, Russian Academy of Sciences, pr. 60-letiya Oktyabrya 7, k. 2, Moscow, 117312, Russian Federation
Skryabin Institute of Microbial Biochemistry and Physiology, Russian Academy of Sciences, Puschino, Russian Federation
Institute of Biophysics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk, Russian Federation : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Lunina, O.N.; Bryantseva, I.A.; Akimov, V.N.; Rusanov, I.I.; Rogozin, D.Yu.; Barinova, E.S.; Lysenko, A.M.; Pimenov, N.V.

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