Environmental chemicals and biomembranes 1. Nitrilotriacetic acid

Rösick, Erika; Stadtlander, Klaus; Ahlers, J.

doi:10.1016/0045-6535(85)90246-2

Cited by 6 publications

(1 citation statement)

References 21 publications

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“…Membrane potentials are mainly determined by electrical gradient across the plasma membrane for the K + ions performing a significant regulatory function in this process. It is known that membranes are the most labile and is initial part in the mechanism of active reaction of the plant organism to external influences [22,23].…”

Section: Resultsmentioning

confidence: 99%

THE ACCUMULATION PROCESS of¹³⁷Cs AND⁹⁰Sr IN THE CELL OF NITELLOPSIS OBTUSA ALGAE

Marčiulionienė¹,

Jefanova²,

Sakalauskas³

et al. 2016

RadJ

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Abstract. In the present study, we investigated the accumulation of 137 Cs and 90 Sr in compartments of the Nitellopsis obtusa cells. The effect of Sr 2+ , Cs + and Ca 2+ , K + , which are chemical analogues of 90 Sr and 137 Cs, to the bioelectric parameters of these algae were studied simultaneously. The aim of this work was studying the penetration of 137 Cs and 90 Sr through regulating membrane barriers in the cells of starry stonewort (Nitellopsis obtusa). 137 Cs and 90 Sr are accumulated mainly in the cell membrane (75% to 92%) of these algae. The cell membrane as a cation exchanger regulates ion flow through the first cells diffusion barrier -its thick outer cytomembrane (the complex consisting of the cell wall and plasmalemma). Significantly, smaller amounts of 137 Cs and 90 Sr enter into the cytoplasm than in the cytomembrane, 10-20% and 3-10%, respectively. Analysis of the accumulation levels of 137 Cs and 90 Sr in the compartments of the Nitellopsis obtusa cells show their accumulation in the cell membrane as well as their active transport through outer and inner cytoplasmic membranes. Membrane potentials determined mainly by the gradient of the K + ions are doing an important regulatory function in this process. From the obtained data it results that cells of Nitellopsis obtusa algae can be a convenient radioecological model for the study of the accumulation of radionuclides in plants at the cellular level.

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Section: Resultsmentioning

confidence: 99%