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Biochemical fractionation and cellular distribution of americium and plutonium in the biomass of freshwater macrophytes / T. A. Zotina, G. S. Kalacheva, A. Y. Bolsunovsky // Journal of Radioanalytical and Nuclear Chemistry. - 2011. - Vol. 290, Is. 2. - P447-451, DOI 10.1007/s10967-011-1228-2 . - ISSN 0236-5731
Кл.слова (ненормированные):
238, 242Pu -- 241Am -- Carbohydrates -- Cellulose -- Fractionation -- Protein -- Submerged macrophyte -- americium 241 -- plutonium -- plutonium 238 -- plutonium 242 -- polysaccharide -- unclassified drug -- article -- bioaccumulation -- biomass -- cellular distribution -- Ceratophyllum demersum -- controlled study -- cytosol -- Elodea canadensis -- Fontinalis antipyretica -- fractionation -- freshwater species -- macrophyte -- moss -- Myriophyllum spicatum -- nonhuman -- plant cell -- radiation absorption -- radioactivity -- shoot
Аннотация: Accumulation of americium ( 241Am) and plutonium ( 238,242Pu) and their distribution in cell compartments and biochemical components of the biomass of freshwater aquatic plants Elodea canadensis, Ceratophyllum demersum and Myrioplyllum spicatum and aquatic moss Fontinalis antipyretica have been investigated in laboratory experiments. Americium and plutonium taken up from water by Elodea canadensis apical shoots were mainly absorbed by structural components of plant cells (90% for 241Am; 89% for 238Pu and 82-87% for 242Pu). About 10-18% of isotope activity was recorded in the cytosol fraction. The major concentration (76-92%) of americium was bound to cell wall cellulose-like polysaccharides of Elodea canadensis, Myriophyllum spicatum, Ceratophyllum demersum and Fontinalis antipyretica, 8-24% of americium activity was registered in the fraction of proteins and carbohydrates, and just a minor concentration (<1%) in the lipid fraction. The distribution of plutonium in the biomass fractions of Elodea was similar to that of americium. Hence, americium and plutonium had the highest affinity to cellulose-like polysaccharides of cell walls of freshwater submerged macrophytes. В© 2011 Akademiai Kiado, Budapest, Hungary.

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

Доп.точки доступа:
Zotina, T.A.; Kalacheva, G.S.; Bolsunovsky, A.Y.

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Modifying the Models of Calcium Dynamics in Astrocytes by Ryanodine Release / Y. Fritsler, S. Bartsev, O. Belozor [et al.] // Math. Biol. Bioinform. - 2021. - Vol. 16, Is. 1. - P86-100, DOI 10.17537/2021.16.86 . - ISSN 1994-6538
Кл.слова (ненормированные):
astrocyte -- CICR -- mathematical model
Аннотация: The influence of ryanodine channels on the cytosole Ca2+dynamics was studied. We added the equations for ryanodine receptors and voltage-gated calcium channels into the original De Pitta et al. model of Ca2+. The derived model was shown to have significantly wider range of predictions: we derived the frequency of cytosole calcium spontaneous oscillations (which are absent in the original De Pitta et al. model) for various existing models of Ca2+signalling in astrocytes. Particularly, the initial De Pitta et al. results can be converted to either Lavrentovich and Hemkin model or in the Dupont et al model predictions. The absence of the Ca2+oscillations in astrocytes with the active ryanodine channels only was recently reported. This behaviour can be achieved in our model predictions for the certain values of parameters, which are supposedly responsible for the bifurcation landscape between the oscillatory and non-oscillatory dynamics of cytosol Ca2+in astrocytes. We also investigated the interplay between the spontaneous and glutamate-triggered oscillations. © 2021. All Rights Reserved.

Scopus
Держатели документа:
Siberian Federal University, Krasnoyarsk, Russian Federation
Institute of Biophysics SB RAS, Krasnoyarsk, Russian Federation
Krasnoyarsk State Medical University, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Fritsler, Y.; Bartsev, S.; Belozor, O.; Ant., S.; And., S.

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