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Effect of daily variations in abiotic conditions on the distribution and production of phytoplankton in Lake Baikal / A. V. Kartushinskii // Water Resources. - 1997. - Vol. 24, Is. 1. - P60-67 . - ISSN 0097-8078
Аннотация: Based on experimental and field data, the character of daily variations in the production and distribution of the phytoplankton biomass under various hydrodynamic and thermodynamic conditions is analyzed. The effects of density stratification, wind and light conditions, vertical water flows, and daily migration of the Zooplankton on the life activity of the phytoplankton are simulated. It is shown that the vertical distribution of the maximum concentrations of the phytoplankton depends on daily variations in a number of abiotic factors. В© 1997 MAHK Hayka/Interperiodica Publishing.

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

Доп.точки доступа:
Kartushinskii, A.V.

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Effects of modified magnetite nanoparticles on bacterial cells and enzyme reactions / L. S. Bondarenko, E. S. Kovel, K. A. Kydralieva [et al.] // Nanomaterials. - 2020. - Vol. 10, Is. 8. - Ст. 1499. - P1-20, DOI 10.3390/nano10081499 . - ISSN 2079-4991
Кл.слова (ненормированные):
Bacterial assay -- Bioluminescence -- Enzymatic assay -- Humic acids-coated magnetite nanoparticles -- Hydrodynamic diameter -- Luciferase -- Magnetite nanoparticles -- NADH:FMN-oxidoreductase -- Oxidative stress -- Photobacterium phosphoreum -- Silica-coated magnetite nanoparticles -- Toxicity -- Zeta potential
Аннотация: Current paper presents biological effects of magnetite nanoparticles (MNPs). Analyzing effects of MNP’ characteristics (zeta-potential and hydrodynamic diameters) on bacteria and their enzyme reactions was the main focus. Photobacterium phosphoreum and bacterial enzymatic reactions were chosen as bioassays. Three types of MNPs were under study: bare Fe3O4, Fe3O4 modified with 3-aminopropyltriethoxysilane (Fe3O4/APTES), and humic acids (Fe3O4/HA). Effects of the MNPs were studied at a low concentration range (< 2 mg/L) and attributed to availability and oxidative activity of Fe3+, high negative surface charge, and low hydrodynamic diameter of Fe3O4/HA, as well as higher Fe3+ content in suspensions of Fe3O4/HA. Low-concentration suspensions of bare Fe3O4 provided inhibitory effects in both bacterial and enzymatic bioassays, whereas the MNPs with modified surface (Fe3O4/APTES and Fe3O4/HA) did not affect the enzymatic activity. Under oxidative stress (i.e., in the solutions of model oxidizer, 1,4-benzoquinone), MNPs did not reveal antioxidant activity, moreover, Fe3O4/HA demonstrated additional inhibitory activity. The study contributes to the deeper understanding of a role of humic substances and silica in biogeochemical cycling of iron. Bioluminescence assays, cellular and enzymatic, can serve as convenient tools to evaluate bioavailability of Fe3+ in natural dispersions of iron-containing nanoparticles, e.g., magnetite, ferrihydrite, etc. © 2020 by the authors. Licensee MDPI, Basel, Switzerland.

Scopus
Держатели документа:
Moscow Aviation Institute (National Research University), Moscow, 125993, Russian Federation
Institute of Physics SB RAS, FRC KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Institute of Biophysics SB RAS, FRC KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Institute of Problems of Chemical Physics RAS, Moscow Region, Chernogolovka, 142432, Russian Federation
University of Szeged, Szeged, H-6720, Hungary
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation

Доп.точки доступа:
Bondarenko, L. S.; Kovel, E. S.; Kydralieva, K. A.; Dzhardimalieva, G. I.; Illes, E.; Tombacz, E.; Kicheeva, A. G.; Kudryasheva, N. S.

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Effects of Modified Magnetite Nanoparticles on Bacterial Cells and Enzyme Reactions / L. S. Bondarenko, E. S. Kovel, K. A. Kydralieva [et al.] // Nanomaterials. - 2020. - Vol. 10, Is. 8. - Ст. 1499, DOI 10.3390/nano10081499. - Cited References:83. - This research was funded by the Russian Foundation for Basic Research (#19-315-50048, #19-33-90149, and #18-29-19003). . - ISSN 2079-4991

РУБ Nanoscience & Nanotechnology + Materials Science, Multidisciplinary
Рубрики:
NATURAL ORGANIC-MATTER
HUMIC-ACID
DETOXIFICATION PROCESSES
Кл.слова (ненормированные):
magnetite nanoparticles -- humic acids-coated magnetite nanoparticles -- silica-coated magnetite nanoparticles -- zeta potential -- hydrodynamic -- diameter -- toxicity -- bioluminescence -- bacterial assay -- enzymatic assay -- oxidative stress -- Photobacterium phosphoreum -- NADH -- FMN-oxidoreductase -- luciferase
Аннотация: Current paper presents biological effects of magnetite nanoparticles (MNPs). Relations of MNP' characteristics (zeta-potential and hydrodynamic diameters) with effects on bacteria and their enzymatic reactions were the main focus.Photobacterium phosphoreumand bacterial enzymatic reactions were chosen as bioassays. Three types of MNPs were under study: bare Fe3O4, Fe(3)O(4)modified with 3-aminopropyltriethoxysilane (Fe3O4/APTES), and humic acids (Fe3O4/HA). Effects of the MNPs were studied at a low concentration range (< 2 mg/L) and attributed to availability and oxidative activity of Fe3+, high negative surface charge, and low hydrodynamic diameter of Fe3O4/HA, as well as higher Fe(3+)content in suspensions of Fe3O4/HA. Low-concentration suspensions of bare Fe(3)O(4)provided inhibitory effects in both bacterial and enzymatic bioassays, whereas the MNPs with modified surface (Fe3O4/APTES and Fe3O4/HA) did not affect the enzymatic activity. Under oxidative stress (i.e., in the solutions of model oxidizer, 1,4-benzoquinone), MNPs did not reveal antioxidant activity, moreover, Fe3O4/HA demonstrated additional inhibitory activity. The study contributes to the deeper understanding of a role of humic substances and silica in biogeochemical cycling of iron. Bioluminescence assays, cellular and enzymatic, can serve as convenient tools to evaluate bioavailability of Fe(3+)in natural dispersions of iron-containing nanoparticles, e.g., magnetite, ferrihydrite, etc.

WOS
Держатели документа:
Natl Res Univ, Moscow Aviat Inst, Moscow 125993, Russia.
FRC KSC SB RAS, Inst Phys SB RAS, Krasnoyarsk 660036, Russia.
FRC KSC SB RAS, Inst Biophys SB RAS, Krasnoyarsk 660036, Russia.
RAS, Moscow Inst Problems Chem Phys, Chernogolovka 142432, Moscow Region, Russia.
Univ Szeged, H-6720 Szeged, Hungary.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.

Доп.точки доступа:
Bondarenko, Lyubov S.; Kovel, Ekaterina S.; Kydralieva, Kamila A.; Dzhardimalieva, Gulzhian, I; Illes, Erzsebet; Tombacz, Etelka; Kicheeva, Arina G.; Kudryasheva, Nadezhda S.; Dzhardimalieva, Gulzhian; Kudryasheva, Nadezhda; Kovel, Ekaterina; Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR) [19-315-50048, 19-33-90149, 18-29-19003]

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