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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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Survival and alteration of the plasmid-containing microorganism Escherichia coli Z905/pPHL7 introduced into manmade closed aquatic microcosms / A. N. Boyandin [et al.] // Advances in Space Research. - 2003. - Vol. 31, Is. 7. - P1763-1768, DOI 10.1016/S0273-1177(03)00118-2 . - ISSN 0273-1177
Кл.слова (ненормированные):
Cells -- Escherichia coli -- Salts -- Recombinant plamid -- Space research -- ampicillin -- chloride -- inorganic salt -- magnesium -- mineral -- potassium -- sodium -- sulfate -- genetically modified organism -- article -- bacterial count -- chemoluminescence -- culture medium -- drug effect -- Escherichia coli -- genetics -- growth, development and aging -- microbiology -- microclimate -- penicillin resistance -- plasmid -- Russian Federation -- transgenic organism -- Ampicillin -- Ampicillin Resistance -- Chemiluminescent Measurements -- Chlorides -- Colony Count, Microbial -- Culture Media -- Ecological Systems, Closed -- Escherichia coli -- Magnesium -- Minerals -- Organisms, Genetically Modified -- Plasmids -- Potassium -- Russia -- Salts -- Sodium -- Sulfates -- Water Microbiology
Аннотация: It has been demonstrated that the transgenic microorganism Escherichia coli Z905/pPHL7 (Ap'Lux+) can exist for a long time at an elevated concentration of mineral salts. The microorganism was introduced into microcosms with sterile brackish water (salinity variable from 21 to 22 g 1-1) taken from Lake Shira (Khakasia, Russia). The survivof the microorganism was estimated both by measuring the growth of the colonies on solid nutrient media and by the bioluminescence exhibited by the transgenic strain in samples from the microcosms and in the enrichment culture with the added selective factor - ampicillin (50 ?g/ml). In the enrichment culture, the bioluminescent signal was registered through the 160-day experiment. It has been shown that in the closed microcosms with brackish water the E. coli strain becomes heterogeneous in its ampicillin resistance. The populations of the transgenic strain were mainly represented by isolates able to persist in the medium containing 50 ?g/ml, but there were also the cells (about 10%) with the threshold of ampicillin resistance not more than 0.05 ?g/ml. Thus, it was shown that in the microcosms with brackish water and in the absence of the selective factor the transgenic strain survives and retains the recombinant plasmid. В© 2003 COSPAR. Published by Elsevier Science Ltd. All rights reserved.

Scopus
Держатели документа:
Institute of Biophysics, Russian Academy of Sciences, Siberian Branch, Krasnoyarsk 660036, Russian Federation : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Boyandin, A.N.; Lobova, T.I.; Popova, L.Yu.; Pechurkin, N.S.

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Sulfate reduction and methanogenesis in the Shira and Shunet meromictic lakes (Khakasia, Russia) / A. Yu. Kallistova [et al.] // Microbiology. - 2006. - Vol. 75, Is. 6. - P720-726, DOI 10.1134/S0026261706060166 . - ISSN 0026-2617
Кл.слова (ненормированные):
Archaea -- Fluorescence in situ hybridization -- Meromictic lakes -- Sulfate-reducing bacteria -- Archaea -- Armoracia rusticana -- Bacteria (microorganisms)
Аннотация: The biogeochemical and molecular biological study of the chemocline and sediments of saline meromictic lakes Shira and Shunet (Khakasia, Russia) was performed. A marked increase in the rates of sulfate reduction and methanogenesis was revealed at the medium depths of the chemocline. The rates of these processes in the bottom sediments decreased with depth. The numbers of the members of domains Bacteria, Archaea, and of sulfate-reducing bacteria (SRB) were determined by fluorescence in situ hybridization with rRNA specific oligonucleotide probes labeled with horseradish peroxidase and subsequent tyramide signal amplification. In the chemocline, both the total microbial numbers and those of Bacteria were shown to increase with depth. The archaea and SRB were present in almost equal numbers. In the lake sediments, a drastic decrease in microbial numbers with depth was revealed. SRB were found to prevail in the upper sediment layer and archaea in the lower one. This finding correlated with the measured rates of sulfate reduction and methanogenesis. В© Nauka/Interperiodica 2006.

Scopus
Держатели документа:
Winogradsky Institute of Microbiology, Russian Academy of Sciences, pr. 60-letiya Oktyabrya, 7/1, 117312 Moscow, Russian Federation
Institute of Biophysics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk, Russian Federation
Limnological Research Center, Swiss Federal Institute for Environmental Sciences and Technology (EAWAG), Seestrasse, 79, CH-6047 Kastanienbaum, Switzerland : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Kallistova, A.Yu.; Kevbrina, M.V.; Pimenov, N.V.; Rusanov, I.I.; Rogozin, D.Yu.; Wehrli, B.; Nozhevnikova, A.N.

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Microbial processes of the carbon and sulfur cycles in Lake Shira (Khakasia) / N. V. Pimenov [и др.] // Mikrobiologiya. - 2003. - Vol. 72, Is. 2. - С. 259-267 . - ISSN 0026-3656
Кл.слова (ненормированные):
Anoxygenic photosynthesis -- Lake Shira -- Production and oxidation of methane -- Purple sulfur bacteria -- Sulfate reduction -- Bacteria (microorganisms) -- Chromatiaceae -- Lamprocystis -- Proteobacteria -- Thiocapsa -- carbon -- fresh water -- methane -- sulfate -- sulfur -- article -- Chromatiaceae -- comparative study -- metabolism -- microbiology -- oxidation reduction reaction -- photosynthesis -- Russian Federation -- Carbon -- Chromatiaceae -- Fresh Water -- Methane -- Oxidation-Reduction -- Photosynthesis -- Russia -- Sulfates -- Sulfur
Аннотация: Microbiological and biogeochemical studies of the meromictic saline Lake Shira (Khakasia) were conducted. In the upper part of the hydrogen-sulfide zone, at a depth of 13.5-14 m, there was a pale pink layer of water due to the development of purple bacteria (6 ? 10 5 cells/ml), which were assigned by their morphological and spectral characteristics to Lamprocystis purpureus (formerly Amoebobacter purpurea). In August, the production of organic matter (OM) in Lake Shira was estimated to be 943 mg C/(m 2 day). The contribution of anoxygenic photosynthesis was insignificant (about 7% of the total OM production). The share of bacterial chemosynthesis was still less (no more than 2%). In the anaerobic zone, the community of sulfate-reducing bacteria played a decisive role in the terminal decomposition of OM. The maximal rates of sulfate reduction were observed in the near-bottom water (114 ?g S/(1 day)) and in the surface layer of bottom sediments (901 ?g S/(dm 3 day)). The daily expenditure of C org for sulfate reduction was 73% of C org formed daily in the processes of oxygenic and anoxygenic photosynthesis and bacterial chemosynthesis. The profile of methane distribution in the water column and bottom sediments was typical of meromictic reservoirs. The methane content in the water column increased beginning with the thermocline (7-8 m), and reached maximum values in the near-bottom water (17 ?l/l). In bottom sediments, the greatest methane concentrations (57 ?l/l) were observed in the surface layer (0-3 cm). The integral rate of methane formation in the water column and bottom sediments was almost an order of magnitude higher than the rate of its oxidation by aerobic and anaerobic methanotrophic microorganisms.

Scopus
Держатели документа:
Institute of Microbiology, Russian Academy of Sciences, pr. 60-letiya Oktyabrya 7, k. 2, Moscow, 117312, Russian Federation
Tomsk State University, Tomsk, Russian Federation
Institute of Biophysics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Pimenov, N.V.; Rusanov, I.I.; Karnachuk, O.V.; Rogozin, D.Yu.; Bryantseva, I.A.; Lunina, O.N.; Yusupov, S.K.; Parnachev, V.P.; Ivanov, M.V.

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Microbial sulfate reduction in a brackish meromictic steppe lake / D. B. Kosolapov [et al.] // Aquatic Ecology. - 2003. - Vol. 37, Is. 3. - P215-226, DOI 10.1023/A:1025871300917 . - ISSN 1386-2588
Кл.слова (ненормированные):
Anoxic waters -- Brackish meromictic lake -- Littoral and profundal sediments -- Sulfate reduction -- anoxic conditions -- brackish water -- meromictic lake -- reduction -- sulfate -- Russian Federation -- Viscum -- Viscum album
Аннотация: Patterns of sulfate reduction were studied in water and sediments of Lake Shira, South Siberia, Russia. The lake was characterized by a high level of sulfate (91-116 mM). The concentration of hydrogen sulfide in the anoxic waters of the lake reached 0.6 mM. In summer the sulfate reduction rate in the water column, measured by radiometric technique, varied from 0.25 to 9.81 ?mol sulfate l-1 d-1. There were two peaks of sulfate reduction activity: just below the chemocline and near the sediment surface. Sulfate reduction rate in the profundal silts ranged from 4.1 to 90.6 ?mol l-1 d-1. The zone of the most active sulfate reduction was restricted to the surface sediment layers. The acceleration of sulfate reduction rate (up to 236 ?mol l-1 d-1) and the increase of density of viable sulfate reducers (up to 2 x 105 cells ml-1) were recorded in the littoral sediments adjacent to the mouth of the Son River and sewage discharge. It was apparently caused by the input of allochthonous organic substrates and also by a high environmental temperature. On an areal basis, sulfate reduction rate in the water was approximately 8 times higher than that in the profundal sediments. Sulfate reduction was the most important process of anaerobic oxidation of organic carbon in Lake Shira. In summer in the profundal zone of the lake, sulfate reducers were able to mineralize about 67% of the daily integrated primary production of phototrophic and chemotrophic organisms.

Scopus
Держатели документа:
Inst. for Biology of Inland Waters, Russian Academy of Sciences, Borok, Nekouz, Yaroslavl, 152742, Russian Federation
Inst. Biophys. Siberian Br. Russ. A., Akademgorodok, Krasnoyarsk, 660036, Russian Federation : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Kosolapov, D.B.; Rogozin, D.Yu.; Gladchenko, I.A.; Kopylov, A.I.; Zakharova, E.E.

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Microbial processes of the carbon and sulfur cycles in Lake Shira (Khakasia) / N. V. Pimenov [et al.] // Microbiology. - 2003. - Vol. 72, Is. 2. - P221-229, DOI 10.1023/A:1023228316838 . - ISSN 0026-2617
Кл.слова (ненормированные):
Anoxygenic photosynthesis -- Lake Shira -- Production and oxidation of methane -- Purple sulfur bacteria -- Sulfate reduction -- Bacteria (microorganisms) -- Chromatiaceae -- Lamprocystis purpurea -- Proteobacteria -- Thiocapsa
Аннотация: Microbiological and biogeochemical studies of the meromictic saline Lake Shira (Khakasia) were conducted. In the upper part of the hydrogen-sulfide zone, at a depth of 13.5-14 m, there was a pale pink layer of water due to the development of purple bacteria (6 ? 105 cells/ml), which were assigned by their morphological and spectral characteristics to Lamprocystis purpurea (formerly Amoebobacter purpureus). In August, the production of organic matter (OM) in Lake Shira was estimated to be 943 mg C/(m2 day). The contribution of anoxygenic photosynthesis was insignificant (about 7% of the total OM production). The share of bacterial chemosynthesis was still less (no more than 2%). In the anaerobic zone, the community of sulfate-reducing bacteria played a decisive role in the terminal decomposition of OM. The maximal rates of sulfate reduction were observed in the near-bottom water (114 ?g S/(1 day)) and in the surface layer of bottom sediments (901 ?g S/(dm3 day)). The daily expenditure of Corg for sulfate reduction was 73% of Corg formed daily in the processes of oxygenic and anoxygenic photosynthesis and bacterial chemosynthesis. The profile of methane distribution in the water column and bottom sediments was typical of meromictic reservoirs. The methane content in the water column increased beginning with the thermocline (7-8 m) and reached maximum values in the near-bottom water (17 ?l/l). In bottom sediments, the greatest methane concentrations (57 ?l/l) were observed in the surface layer (0-3 cm). The integral rate of methane formation in the water column and bottom sediments was almost an order of magnitude higher than the rate of its oxidation by aerobic and anaerobic methanotrophic microorganisms.

Scopus
Держатели документа:
Institute of Microbiology, Russian Academy of Sciences, pr. 60-letiya Oktyabrya 7, k. 2, Moscow, 117312, Russian Federation
Tomsk State University, Tomsk, Russian Federation
Institute of Biophysics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Pimenov, N.V.; Rusanov, I.I.; Karnachuk, O.V.; Rogozin, D.Yu.; Bryantseva, I.A.; Lunina, O.N.; Yusupov, S.K.; Parnachev, V.P.; Ivanov, M.V.

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PHYSICOCHEMICAL PROPERTIES OF A PHOTOPROTEIN FROM THE HYDROID POLYP OBELIA-LONGISSIMA [Text] / V. S. BONDAR, K. P. TROFIMOV, E. S. VYSOTSKII // Biochem.-Moscow. - 1992. - Vol. 57, Is. 10. - P1020-1027. - Cited References: 36 . - 8. - ISSN 0006-2979

РУБ Biochemistry & Molecular Biology
Рубрики:
CALCIUM-ACTIVATED PHOTOPROTEINS
   CTENOPHORES MNEMIOPSIS SP
   BEROE-OVATA
   AEQUORIN
   CA-2+
   INDICATORS
   PROTEIN
   BINDING
   PURIFICATION
   EXTRACTION
Кл.слова (ненормированные):
BIOLUMINESCENCE -- CA2+-ACTIVATED PHOTOPROTEIN -- OBELIN -- CHROMATOGRAPHY -- CALCIUM
Аннотация: The photoprotein obelin was isolated and purified to homogeneity (as indicated by sodium dodecyl sulfate polyacrylamide gel electrophoresis) from hydroids of Obelia longissima by gel filtration on Sephadex G-75 fine, ion exchange chromatography on Polysil CA-300 (10 mum), hydrophobic chromatography on Phenyl-Sepharose CL-4B, gel filtration on Sephacryl S-200 superfine, ion exchange chromatography on a Mono Q column at pH 7.0, chromatofocusing on a Mono P column (pH gradient 6.0-4.0), and ion exchange chromatography on a Mono Q column at pH 5.5, 8.8, and 7.0. The molecular weight of the native protein was 30 kD, and that measured in the presence of SDS was 19.8 kD. The specific activity of obelin is 4.9.10(15) quanta/mg protein, pseudo-first-order constant of bioluminescence decay 4 sec-1, and quantum yield 0.16 The range of measurable Ca2+ concentrations is 10(-7) to 10(-5) M. The luminescence spectrum of obelin peaks at 469 nm, and the fluorescence emission maximum of the discharged protein is at 455 nm. The optimum pH for luminescence is between 9.0 and 10.5. The molecular ionization constants are pK1 6.8 and pK2 12.2, and the ionization constants for the active site are pK1 9.1 and pK2 10.2
: 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
BONDAR, V.S.; TROFIMOV, K.P.; VYSOTSKII, E.S.

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EFFECT OF TEMPERATURE ON ACTIVITY AND STABILITY OF OBELIN [Text] / V. S. BONDAR [et al.] // Biochem.-Moscow. - 1992. - Vol. 57, Is. 7. - P717-724. - Cited References: 15 . - 8. - ISSN 0006-2979

РУБ Biochemistry & Molecular Biology
Рубрики:
CA-2+
PHOTOPROTEINS
INDICATORS
Кл.слова (ненормированные):
PHOTOPROTEINS -- OBELIN -- ACTIVATION ENERGY -- THERMOINACTIVATION -- THERMOSTABILITY
Аннотация: The temperature dependence of bioluminescent activity of the Ca2+-activated photoprotein obelin from the hydroid polyp Obelia longissima and thermoinactivation of this protein at different concentrations of (NH4)2SO4 have been studied. The maximal intensity of luminescence of obelin was observed at 4-15-degrees-C. The activity of the photoprotein is completely stable to storage for 3 days at room temperature. Increasing the temperature to 40-degrees-C resulted in a 25-30% loss of enzyme activity in 1 h. The presence of ammonium sulfate during heating stabilizes the activity of obelin. Two breaks, at 11 +/- 3-degrees-C and 47 +/- 3-degrees-C, are observed in the Arrhenius plot of the first-order rate constant of the luminescence decay. The bioluminescent curves of obelin are biphasic in the temperature range 10-40-degrees-C. It is assumed that obelin may exist in two kinetically distinct conformers (active and inactive) whose ratio is temperature dependent.
: 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
BONDAR, V.S.; TROFIMOV, K.P.; SANDALOV, T.P.; VYSOTSKII, E.S.

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10.

Effect of different salts and detergents on luciferin-luciferase luminescence of the enchytraeid Fridericia heliota / N. S. Rodionova, V. N. Petushkov // Journal of Photochemistry and Photobiology B: Biology. - 2006. - Vol. 83, Is. 2. - P123-128, DOI 10.1016/j.jphotobiol.2005.12.014 . - ISSN 1011-1344
Кл.слова (ненормированные):
ATP -- Bioluminescence -- Earthworms -- Ions -- Luciferin-luciferase systems -- Triton X-100 -- adenosine triphosphate -- anion -- bromine -- calcium ion -- carbonic acid -- cation -- chloride -- chromium derivative -- detergent -- dodecyl sulfate sodium -- inorganic salt -- iodine -- iron derivative -- luciferase -- luciferin -- magnesium ion -- manganese -- nitrate -- phosphate -- sulfate -- sulfite -- triton x 100 -- annelid worm -- article -- bioluminescence -- concentration (parameters) -- controlled study -- enzyme activation -- enzyme activity -- enzyme inhibition -- enzyme mechanism -- in vitro study -- nonhuman -- priority journal -- qualitative analysis -- quantitative analysis -- Adenosine Triphosphate -- Animals -- Cations, Divalent -- Cations, Monovalent -- Detergents -- Firefly Luciferin -- Kinetics -- Luciferases -- Luminescence -- Metals -- Oligochaeta -- Photobiology -- Salts -- Annelida -- Clitellata -- earthworms (sp.) -- Enchytraeidae -- Fridericia heliota -- Oligochaeta (Metazoa) -- Pheretima sieboldi
Аннотация: The study addresses the effect produced by different inorganic salts and detergents (SDS, Triton X-100, the Tween series) on the ATP-dependent bioluminescent reaction catalyzed by the luciferase of the new earthworm species Fridericia heliota (Annelida: Clitellata: Oligochaeta: Enchytraeidae). It has been shown that the effect of divalent metal salts on luminescence is determined by the action of cations. Three of them - Mg2+, Mn2+ and Ca2+ - can stimulate luciferase activity at concentrations varying within a wide range, and Mn2+ can act as a 100%-effective substitute for Mg2+ in F. heliota luminescence reaction in vitro. The inhibitory effect of monovalent metal salts on luminescence is largely determined by the action of the anion part of the molecule. The effectiveness of the inhibitory effect of anions increases in the following order: {Mathematical expression}. Of the sodium salts, dodecyl sulfate, which is an anionic detergent, produces the strongest inhibitory effect on luciferase. On the contrary, nonionic detergents produce a stimulatory effect on the F. heliota luciferase. The action of the most effective of them - Triton X-100 - is determined by its ability to reduce the actual concentration of lipid inhibitors in the reaction mixture. В© 2006 Elsevier B.V. All rights reserved.

Scopus
Держатели документа:
Institute of Biophysics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Rodionova, N.S.; Petushkov, V.N.

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11.

EFFECT OF AGITATION INTENSITY AND SAS CONCENTRATION ON RATE OF OXYGEN SORPTION BY MODEL SULFATE-ALBUMIN MEDIUM [Текст] / G. S. VOROBYOVA, N. S. PECHURKIN // ANTIBIOTIKI I MEDITSINSKAYA BIOTEKHNOLOGIYA. - 1985. - Vol. 30, Is. 7. - P. 521-525. - Cited References: 14 . - ISSN 0233-7525

РУБ Microbiology + Pharmacology & Pharmacy

WOS : 660036, Красноярск, Академгородок, д. 50, стр. 50
Доп.точки доступа:
VOROBYOVA, G.S.; PECHURKIN, N.S.

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12.

Microbial sulfate reduction in a brackish meromictic steppe lake [Text] / D. B. Kosolapov [et al.] // Aquat. Ecol. - 2003. - Vol. 37, Is. 3. - P. 215-226, DOI 10.1023/A:1025871300917. - Cited References: 43 . - ISSN 1386-2588

РУБ Ecology + Limnology + Marine & Freshwater Biology
Рубрики:
REDUCING BACTERIA
   SULFUR-COMPOUNDS
   LITTORAL SEDIMENT
   INORGANIC SULFUR
   EUTROPHIC LAKE
   SALT-LAKE
   RATES
   MARINE
   CYCLE
   TEMPERATURE
Кл.слова (ненормированные):
anoxic waters -- brackish meromictic lake -- littoral and profundal sediments -- sulfate reduction
Аннотация: Patterns of sulfate reduction were studied in water and sediments of Lake Shira, South Siberia, Russia. The lake was characterized by a high level of sulfate (91-116 mM). The concentration of hydrogen sulfide in the anoxic waters of the lake reached 0.6 mM. In summer the sulfate reduction rate in the water column, measured by radiometric technique, varied from 0.25 to 9.81 mumol sulfate l(-1) d(-1). There were two peaks of sulfate reduction activity: just below the chemocline and near the sediment surface. Sulfate reduction rate in the profundal silts ranged from 4.1 to 90.6 mumol l(-1) d(-1). The zone of the most active sulfate reduction was restricted to the surface sediment layers. The acceleration of sulfate reduction rate (up to 236 mumol l(-1) d(-1)) and the increase of density of viable sulfate reducers (up to 2x10(5) cells ml(-1)) were recorded in the littoral sediments adjacent to the mouth of the Son River and sewage discharge. It was apparently caused by the input of allochthonous organic substrates and also by a high environmental temperature. On an areal basis, sulfate reduction rate in the water was approximately 8 times higher than that in the profundal sediments. Sulfate reduction was the most important process of anaerobic oxidation of organic carbon in Lake Shira. In summer in the profundal zone of the lake, sulfate reducers were able to mineralize about 67% of the daily integrated primary production of phototrophic and chemotrophic organisms.

WOS
Держатели документа:
Russian Acad Sci, Inst Biol Inland Waters, Yaroslavl 152742, Russia
Russian Acad Sci, Siberian Branch, Inst Biophys, Krasnoyarsk 660036, Russia
ИБФ СО РАН : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Kosolapov, D.B.; Rogozin, D.Y.; Gladchenko, I.A.; Kopylov, A.I.; Zakharova, E.E.

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13.

Microbial processes of the carbon and sulfur cycles in Lake Shira (Khakasia) [Text] / N. V. Pimenov [et al.] // Microbiology. - 2003. - Vol. 72, Is. 2. - P. 221-229, DOI 10.1023/A:1023228316838. - Cited References: 17 . - ISSN 0026-2617

РУБ Microbiology
Рубрики:
BACTERIA
NOV
Кл.слова (ненормированные):
Lake Shira -- anoxygenic photosynthesis -- purple sulfur bacteria -- sulfate reduction -- production and oxidation of methane
Аннотация: Microbiological and biogeochemical studies of the meromictic saline Lake Shira (Khakasia) were conducted. In the upper part of the hydrogen-sulfide zone, at a depth of 13.5-14 m, there was a pale pink layer of water due to the development of purple bacteria (6 x 10(5) cells/ml), which were assigned by their morphological and spectral characteristics to Lamprocystis purpurea (formerly Amoebobacter purpureus). In August, the production of organic matter (OM) in Lake Shira was estimated to be 943 mg C/(m(2) day). The contribution of anoxygenic photosynthesis was insignificant (about 7% of the total OM production). The share of bacterial chemosynthesis was still less (no more than 2%). In the anaerobic zone, the community of sulfate-reducing bacteria played a decisive role in the terminal decomposition of OM. The maximal rates of sulfate reduction were observed in the near-bottom water (114 mug S/(1 day)) and in the surface layer of bottom sediments (901 mug S/(dm(3) day)). The daily expenditure of C-org for sulfate reduction was 73% of C-org formed daily in the processes of oxygenic and anoxygenic photosynthesis and bacterial chemosynthesis. The profile of methane distribution in the water column and bottom sediments was typical of meromictic reservoirs. The methane content in the water column increased beginning with the thermocline (7-8 m) and reached maximum values in the near-bottom water (17 mul/l). In bottom sediments, the greatest methane concentrations (57 mul/l) were observed in the surface layer (0-3 cm). The integral rate of methane formation in the water column and bottom sediments was almost an order of magnitude higher than the rate of its oxidation by aerobic and anaerobic methanotrophic microorganisms.

WOS
Держатели документа:
Russian Acad Sci, Inst Microbiol, Moscow 117312, Russia
Tomsk VV Kuibyshev State Univ, Tomsk, Russia
Russian Acad Sci, Siberian Div, Inst Biophys, Krasnoyarsk 660036, Russia
ИБФ СО РАН : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Pimenov, N.V.; Rusanov, I.I.; Karnachuk, O.V.; Rogozin, D.Y.; Bryantseva, I.A.; Lunina, O.N.; Yusupov, S.K.; Parnachev, V.P.; Ivanov, M.V.

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14.

Comparative assessment of toxic effects of surfactants using biotesting methods / E. V. Evsyunina [et al.] // Inland Water Biol. - 2016. - Vol. 9, Is. 2. - P196-199, DOI 10.1134/S1995082916020061 . - ISSN 1995-0829
Кл.слова (ненормированные):
algae -- bioluminescent bacteria -- biotesting -- daphnia -- fluorescence of chlorophyll -- infusorian -- surfactants -- survival -- toxic effect -- algae -- Ciliophora -- Crustacea -- Daphnia -- Daphnia magna -- Paramecium caudatum -- Photobacterium phosphoreum -- Protozoa -- Scenedesmus quadricauda
Аннотация: This study assesses the comparative sensitivity and possibility of obtaining fast results of various methods of biotesting for several surfactants: Tween 85, sodium dodecyl sulfate (SDS), Fairy dishwashing gel, and Mif washing powder. The following test organisms are used for the study: luminescent bacteria Photobacterium phosphoreum (Beijerinck), preparation of Ecolum luminescent bacteria, unicellular algae Scenedesmus quadricauda (G.M. Smith), infusorian Paramecium caudatum (Ehrenberg), and crustacean Daphnia magna (Straus). It has been revealed that Fairy dishwashing gel possesses the strongest toxicity against the studied test objects. Daphnia and algae are most sensitive to the effects of Fairy and SDS, protozoan and luminescent bacteria are most sensitive to SDS, and Ecolum is most sensitive to Mif washing powder. The tested aquatic organisms and Ecolum are most tolerant to the effect of Tween 85. © 2016, Pleiades Publishing, Ltd.

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WOS
Держатели документа:
Irkutsk State University, ul. Karla Marksa 1, Irkutsk, Russian Federation
Siberian Federal University, pr. Svobodny 79, Krasnoyarsk, Russian Federation
Baikal Museum, ul. Akademicheskaya 1, Listvyanka, Irkutsk oblast, Russian Federation
National Research Irkutsk State Technical University, ul. Lermontova 83, Irkutsk, Russian Federation
Institute of Biophysics, Siberian Branch, Russian Academy of Sciences, Akademgorodok 50, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Evsyunina, E. V.; Taran, D. O.; Stom, D. I.; Saksonov, M. N.; Balayan, A. E.; Kirillova, M. A.; Esimbekova, E. N.; Kratasyuk, V. A.

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15.

Analytical Enzymatic Reactions in Microfluidic Chips / K. A. Lukyanenko [et al.] // Appl. Biochem. Microbiol. - 2017. - Vol. 53, Is. 7. - P775-780, DOI 10.1134/S0003683817070043. - Cited References:15. - The study was supported by a grant from the Russian Science Foundation (project No. 15-19-10041). . - ISSN 0003-6838. - ISSN 1573-8183

РУБ Biotechnology & Applied Microbiology + Microbiology
Рубрики:
BIOAVAILABLE HEAVY-METALS
   DEVICES
   POINT
   LAB
Кл.слова (ненормированные):
bioluminescence -- luciferase -- microfluidics -- microfluidic chip -- enzymatic -- bioassay
Аннотация: A number of approaches have been proposed and tested to transfer enzymatic reactions into the functional elements of microfluidic chips on the example of the bienzyme bioluminescent reaction involving NAD(P)H:FMN-oxidoreductase and luciferase. Measurement of the catalytic activity of these enzymes (under the influence of pollutants) is the basis of enzymatic bioassay of various liquids. It was found that all of the components of the reaction must be placed in the same cell of the chip to improve the reproducibility of the measurements. The use of starch gel as a carrier for immobilization and gelatin as a scaffold in the reactor of the chip enables the preservation of enzyme activity in the course of sealing the chip at room temperature. It is shown that the components of the reaction should be vigorously stirred in a microfluidic chip reactor to improve the efficiency of the analysis. As a result of the studies, a prototype of microfluidic chip based on the enzymatic bioluminescent reaction is proposed. It is characterized by a detection limit of copper sulfate of 3 mu M that corresponds to the sensitivity of traditional lux-biosensors based on living cells. The analysis time is reduced to 1 min, and the analysis can be performed by individuals without special laboratory skills.

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Scopus
Держатели документа:
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
Russian Acad Sci, Inst Biophys, Siberian Branch, Krasnoyarsk 660036, Russia.
St Petersburg Inst Fine Mech & Opt, St Petersburg 197101, Russia.
Inst Analyt Instrumentat, St Petersburg 198095, Russia.

Доп.точки доступа:
Lukyanenko, K. A.; Denisov, I. A.; Yakimov, A. S.; Esimbekova, E. N.; Belousov, K. I.; Bukatin, A. S.; Kukhtevich, I. V.; Sorokin, V. V.; Evstrapov, A. A.; Belobrov, P. I.; Russian Science Foundation [15-19-10041]

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16.

Disposable luciferase-based microfluidic chip for rapid assay of water pollution / I. Denisov [et al.] // Lumin. - 2018. - Vol. 33, Is. 6. - P1054-1061, DOI 10.1002/bio.3508 . - ISSN 1522-7235
Кл.слова (ненормированные):
bioassay -- lab-on-a-chip -- luciferase -- microfluidics -- solvent bonding
Аннотация: In the present study, we demonstrate the use of a disposable luciferase-based microfluidic bioassay chip for environmental monitoring and methods for fabrication. The designed microfluidic system includes a chamber with immobilized enzymes of bioluminescent bacteria Photobacterium leiognathi and Vibrio fischeri and their substrates, which dissolve after the introduction of the water sample and thus activate bioluminescent reactions. Limits of detection for copper (II) sulfate, 1,3-dihydroxybenzene and 1,4-benzoquinone for the proposed microfluidic biosensor measured 3 ?M, 15 mM, and 2 ?M respectively, and these values are higher or close to the level of conventional environmental biosensors based on lyophilized bacteria. Approaches for entrapment of enzymes on poly(methyl methacrylate) (PMMA) plates using a gelatin scaffold and solvent bonding of PMMA chip plates under room temperature were suggested. The proposed microfluidic system may be used with some available luminometers and future portable luminescence readers. © 2018 John Wiley & Sons, Ltd.

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WOS
Держатели документа:
Siberian Federal University, Krasnoyarsk, Russian Federation
Institute of Biophysics SB RAS Federal Research Center'Krasnoyarsk Science Center SB RAS’, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Denisov, I.; Lukyanenko, K.; Yakimov, A.; Kukhtevich, I.; Esimbekova, E.; Belobrov, P.

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17.

Handheld Enzymatic Luminescent Biosensor for Rapid Detection of Heavy Metals in Water Samples / K. A. Lukyanenko [et al.] // Chemosensors. - 2019. - Vol. 7, Is. 1. - Ст. 16, DOI 10.3390/chemosensors7010016. - Cited References:39. - This research was funded by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science, to the research project #18-44-242003: "Designing an enzyme reagent for bioluminescent analysis: mechanisms for increasing sensitivity and accuracy". . - ISSN 2227-9040

РУБ Chemistry, Analytical
Рубрики:
ON-A-CHIP
   SILICON PHOTOMULTIPLIER
   OPTICAL BIOSENSORS
   CELL
Кл.слова (ненормированные):
chemical measurements -- silicon photomultiplier -- optical biosensor -- bioassay -- microfluidics -- luciferase -- bioluminescence
Аннотация: Enzymatic luminescent systems are a promising tool for rapid detection of heavy metals ions for water quality assessment. Nevertheless, their widespread use is limited by the lack of test procedure automation and available sensitive handheld luminometers. Herein we describe integration of disposable microfluidic chips for bioluminescent enzyme-inhibition based assay with a handheld luminometer, which detection system is based on a thermally stabilized silicon photomultiplier (SiPM). Microfluidic chips were made of poly(methyl methacrylate) by micro-milling method and sealed using a solvent bonding technique. The composition of the bioluminescent system in microfluidic chip was optimized to achieve higher luminescence intensity and storage time. Results indicate that developed device provided comparable sensitivity with bench-scale PMT-based commercial luminometers. Limit of detection for copper (II) sulfate reached 2.5 mg/L for developed biosensor. Hereby we proved the concept of handheld enzymatic optical biosensors with disposable chips for bioassay. The proposed biosensor can be used as an early warning field-deployable system for rapid detection of heavy metals salts and other toxic chemicals, which affect bioluminescent signal of enzymatic reaction.

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Scopus
Держатели документа:
SB RAS, Krasnoyarsk Sci Ctr, Fed Res Ctr, Lab Digital Controlled Drugs & Theranost, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Lab Bioluminescent Biotechnol, Krasnoyarsk 660041, Russia.
Krasnoyarsk State Med Univ, Res Inst Mol Med & Pathobiochem, Krasnoyarsk 660022, Russia.
SB RAS, Inst Biophys, Lab Photobiol, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Lukyanenko, Kirin A.; Denisov, Ivan A.; Sorokin, Vladimir V.; Yakimov, Anton S.; Esimbekova, Elena N.; Belobrov, Peter, I; Lukyanenko, Kirill; Russian Foundation for Basic Research, Government of Krasnoyarsk Territory [18-44-242003]

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18.

Spatiotemporal Changes in the Bacterial Community of the Meromictic Lake Uchum, Siberia / Y. F. Chan, P. W. Chiang, K. Tandon [et al.] // Microb. Ecol. - 2020, DOI 10.1007/s00248-020-01592-9. - Cited References:77. - This work was supported by the Russian Foundation for Basic Research (grant no. 19-05-00428) and the Russian Foundation for Basic Research, Government of Krasnoyarsk Territory and Krasnoyarsk Regional Fund of Science (project: "Bottom sediments of Lake Uchum (Krasnoyarsky kray) as a source of information for the reconstruction of the paleo-climate and the prediction of the healing properties of the lake", grant no. 18-45-243002) and the Ministry of Science and Technology, Taiwan (project: "Transition in microbial community of stratified lakes in arid zone of South Siberia: Current and Past," grant no. 105-2923-B-001-001-MY3 and project: "Postdoctoral Research Fellows", grant no. 108-2811-M-001-603). . - Article in press. - ISSN 0095-3628. - ISSN 1432-184X

РУБ Ecology + Marine & Freshwater Biology + Microbiology
Рубрики:
PHOTOTROPHIC SULFUR BACTERIA
SP NOV.
MICROBIAL COMMUNITIES
Кл.слова (ненормированные):
Lake Uchum -- bacterial community -- meromictic lake -- purple sulfur bacteria
Аннотация: Lake Uchum is a newly defined meromictic lake in Siberia with clear seasonal changes in its mixolimnion. This study characterized the temporal dynamics and vertical profile of bacterial communities in oxic and anoxic zones of the lake across all four seasons: October (autumn), March (winter), May (spring), and August (summer). Bacterial richness and diversity in the anoxic zone varied widely between time points.Proteobacteriawas the dominant bacterial phylum throughout the oxic and anoxic zones across all four seasons.Alphaproteobacteria(Loktanella) andGammaproteobacteria(Aliidiomarina) exhibited the highest abundance in the oxic and anoxic zone, respectively. Furthermore, there was a successional shift in sulfate-reducing bacteria (SRB) and sulfur-oxidizing bacteria in the anoxic zone across the seasons. The most dominant SRB,Desulfonatronovibriosp., is likely one of the main producers of hydrogen sulfide (H2S) and typically accumulates the most H2S in winter. The representative anoxygenic phototrophic bacterial group in Lake Uchum was purple sulfur bacteria (PSB). PSB were dominant (60.76%) in summer, but only had 0.2-1.5% relative abundance from autumn to spring. Multivariate analysis revealed that the abundance of these SRB and PSB correlated to the concentration of H2S in Lake Uchum. Taken together, this study provides insights into the relationships between changes in bacterial community and environmental features in Lake Uchum.

WOS
Держатели документа:
Acad Sinica, Biodivers Res Ctr, Taipei 115, Taiwan.
Acad Sinica, Taiwan Int Grad Program, Inst Informat Sci, Bioinformat Program, Taipei 115, Taiwan.
Natl Tsing Hua Univ, Inst Mol & Cellular Biol, Hsinchu 300, Taiwan.
Russian Acad Sci, Inst Biophys, Siberian Div, Krasnoyarsk 660036, Russia.
Siberia Fed Univ, Krasnoyarsk 660041, Russia.

Доп.точки доступа:
Chan, Ya-Fan; Chiang, Pei-Wen; Tandon, Kshitij; Rogozin, Denis; Degermendzhi, Andrey; Zykov, Vladimir; Tang, Sen-Lin; Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR) [19-05-00428]; Russian Foundation for Basic Research, Government of Krasnoyarsk Territory; Krasnoyarsk Regional Fund of Science (project: "Bottom sediments of Lake Uchum (Krasnoyarsky kray) as a source of information for the reconstruction of the paleo-climate and the prediction of the healing properties of the lake") [18-45-243002]; Ministry of Science and Technology, TaiwanMinistry of Science and Technology, Taiwan [105-2923-B-001-001-MY3, 108-2811-M-001-603]

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19.

Spatial and temporal variation in Arctic freshwater chemistry-Reflecting climate-induced landscape alterations and a changing template for biodiversity / B. J. Huser, M. N. Futter, D. Bogan [et al.] // Freshw. Biol. - 2020, DOI 10.1111/fwb.13645. - Cited References:98. - Environment and Climate Change Canada; Cumulative Impact Monitoring Program, Government of Northwest Territories . - Article in press. - ISSN 0046-5070. - ISSN 1365-2427

РУБ Ecology + Marine & Freshwater Biology
Рубрики:
DISSOLVED ORGANIC-CARBON
PERMAFROST THAW
CHEMICAL LIMNOLOGY
Кл.слова (ненормированные):
biogeochemistry -- eutrophication -- lakes -- oligotrophication -- rivers
Аннотация: Freshwater chemistry across the circumpolar region was characterised using a pan-Arctic data set from 1,032 lake and 482 river stations. Temporal trends were estimated for Early (1970-1985), Middle (1986-2000), and Late (2001-2015) periods. Spatial patterns were assessed using data collected since 2001. Alkalinity, pH, conductivity, sulfate, chloride, sodium, calcium, and magnesium (major ions) were generally higher in the northern-most Arctic regions than in the Near Arctic (southern-most) region. In particular, spatial patterns in pH, alkalinity, calcium, and magnesium appeared to reflect underlying geology, with more alkaline waters in the High Arctic and Sub Arctic, where sedimentary bedrock dominated. Carbon and nutrients displayed latitudinal trends, with lower levels of dissolved organic carbon (DOC), total nitrogen, and (to a lesser extent) total phosphorus (TP) in the High and Low Arctic than at lower latitudes. Significantly higher nutrient levels were observed in systems impacted by permafrost thaw slumps. Bulk temporal trends indicated that TP was higher during the Late period in the High Arctic, whereas it was lower in the Near Arctic. In contrast, DOC and total nitrogen were both lower during the Late period in the High Arctic sites. Major ion concentrations were higher in the Near, Sub, and Low Arctic during the Late period, but the opposite bulk trend was found in the High Arctic. Significant pan-Arctic temporal trends were detected for all variables, with the most prevalent being negative TP trends in the Near and Sub Arctic, and positive trends in the High and Low Arctic (mean trends ranged from +0.57%/year in the High/Low Arctic to -2.2%/year in the Near Arctic), indicating widespread nutrient enrichment at higher latitudes and oligotrophication at lower latitudes. The divergent P trends across regions may be explained by changes in deposition and climate, causing decreased catchment transport of P in the south (e.g. increased soil binding and trapping in terrestrial vegetation) and increased P availability in the north (deepening of the active layer of the permafrost and soil/sediment sloughing). Other changes in concentrations of major ions and DOC were consistent with projected effects of ongoing climate change. Given the ongoing warming across the Arctic, these region-specific changes are likely to have even greater effects on Arctic water quality, biota, ecosystem function and services, and human well-being in the future.

WOS
Держатели документа:
Swedish Univ Agr Sci, Dept Aquat Sci & Assessment, Box 7050, S-75007 Uppsala, Sweden.
Univ Alaska Anchorage, Alaska Ctr Conservat Sci, Anchorage, AK USA.
Norwegian Water Resources & Energy Directorate, Oslo, Norway.
Univ Oslo, Nat Hist Museum, Oslo, Norway.
Wilfrid Laurier Univ, Cold Regions Res Ctr, Waterloo, ON, Canada.
Russian Acad Sci, Siberian Branch, Inst Biophys, Krasnoyarsk, Russia.
Umea Univ, Climate Impacts Res Ctr, Dept Ecol & Environm Sci, Umea, Sweden.
Queens Univ, Dept Biol, Paleoecol Environm Assessment & Res Lab PEARL, Kingston, ON, Canada.
Norwegian Inst Nat Res, Oslo, Norway.
Univ New Brunswick, Canadian Rivers Inst, Fredericton, NB, Canada.
Univ New Brunswick, Dept Biol, Fredericton, NB, Canada.

Доп.точки доступа:
Huser, Brian J.; Futter, Martyn N.; Bogan, Daniel; Brittain, John E.; Culp, Joseph M.; Goedkoop, Willem; Gribovskaya, Iliada; Karlsson, Jan; Lau, Danny C. P.; Ruhland, Kathleen M.; Schartau, Ann Kristin; Shaftel, Rebecca; Smol, John P.; Vrede, Tobias; Lento, Jennifer; Environment and Climate Change Canada; Cumulative Impact Monitoring Program, Government of Northwest Territories

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20.

Spatial and temporal variation in Arctic freshwater chemistry—Reflecting climate-induced landscape alterations and a changing template for biodiversity / B. J. Huser, M. N. Futter, D. Bogan [et al.] // Freshw. Biol. - 2020, DOI 10.1111/fwb.13645 . - Article in press. - ISSN 0046-5070
Кл.слова (ненормированные):
biogeochemistry -- eutrophication -- lakes -- oligotrophication -- rivers
Аннотация: Freshwater chemistry across the circumpolar region was characterised using a pan-Arctic data set from 1,032 lake and 482 river stations. Temporal trends were estimated for Early (1970–1985), Middle (1986–2000), and Late (2001–2015) periods. Spatial patterns were assessed using data collected since 2001. Alkalinity, pH, conductivity, sulfate, chloride, sodium, calcium, and magnesium (major ions) were generally higher in the northern-most Arctic regions than in the Near Arctic (southern-most) region. In particular, spatial patterns in pH, alkalinity, calcium, and magnesium appeared to reflect underlying geology, with more alkaline waters in the High Arctic and Sub Arctic, where sedimentary bedrock dominated. Carbon and nutrients displayed latitudinal trends, with lower levels of dissolved organic carbon (DOC), total nitrogen, and (to a lesser extent) total phosphorus (TP) in the High and Low Arctic than at lower latitudes. Significantly higher nutrient levels were observed in systems impacted by permafrost thaw slumps. Bulk temporal trends indicated that TP was higher during the Late period in the High Arctic, whereas it was lower in the Near Arctic. In contrast, DOC and total nitrogen were both lower during the Late period in the High Arctic sites. Major ion concentrations were higher in the Near, Sub, and Low Arctic during the Late period, but the opposite bulk trend was found in the High Arctic. Significant pan-Arctic temporal trends were detected for all variables, with the most prevalent being negative TP trends in the Near and Sub Arctic, and positive trends in the High and Low Arctic (mean trends ranged from +0.57%/year in the High/Low Arctic to ?2.2%/year in the Near Arctic), indicating widespread nutrient enrichment at higher latitudes and oligotrophication at lower latitudes. The divergent P trends across regions may be explained by changes in deposition and climate, causing decreased catchment transport of P in the south (e.g. increased soil binding and trapping in terrestrial vegetation) and increased P availability in the north (deepening of the active layer of the permafrost and soil/sediment sloughing). Other changes in concentrations of major ions and DOC were consistent with projected effects of ongoing climate change. Given the ongoing warming across the Arctic, these region-specific changes are likely to have even greater effects on Arctic water quality, biota, ecosystem function and services, and human well-being in the future. © 2020 The Authors. Freshwater Biology published by John Wiley & Sons Ltd.

Scopus
Держатели документа:
Department of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences, Uppsala, Sweden
Alaska Center for Conservation Science, University of Alaska Anchorage, Anchorage, AK, United States
Norwegian Water Resources & Energy Directorate, Oslo, Norway
Natural History Museum, University of Oslo, Oslo, Norway
Cold Regions Research Centre, Wilfrid Laurier University, Waterloo, ON, Canada
Institute of Biophysics, Siberian Branch of Russian Academy of Sciences, Krasnoyarsk, Russian Federation
Department of Ecology and Environmental Science, Climate Impacts Research Centre, Umea University, Abisko, Sweden
Paleoecological Environmental Assessment and Research Laboratory (PEARL), Department of Biology, Queen’s University, Kingston, ON, Canada
Norwegian Institute for Nature Research, Oslo, Norway
Canadian Rivers Institute and Department of Biology, University of New Brunswick, Fredericton, NB, Canada

Доп.точки доступа:
Huser, B. J.; Futter, M. N.; Bogan, D.; Brittain, J. E.; Culp, J. M.; Goedkoop, W.; Gribovskaya, I.; Karlsson, J.; Lau, D. C.P.; Ruhland, K. M.; Schartau, A. K.; Shaftel, R.; Smol, J. P.; Vrede, T.; Lento, J.

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