Linked Life Data

11678284

Source:http://linkedlifedata.com/resource/pubmed/id/11678284

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pubmed-article:11678284pubmed:abstractTextThe influence of membrane surface charge on cation uptake was investigated in protoplasts prepared from roots of mung bean (Vigna radiata L.). Confocal laser scanning microscopy showed that a fluorescent trivalent cation accumulated to very high concentrations at the surface of the protoplasts when they were incubated in medium containing low concentrations of Ca or other cations, but that this accumulation could be completely reversed by suppression of membrane surface negativity by high cation concentrations. Influx of 63Ni was strongly reduced by a range of divalent cations. Increasing the Ca concentration in the medium from 25 microM to 10 mM inhibited 63Ni influx by more than 85%. 63Ni influx was also inhibited by 85% by reducing the pH from 7 to 4. Computation of the activity of Ni at the membrane surface under the various treatment conditions showed that Ni uptake was closely correlated with its activity at the membrane surface but not with its concentration in the bulk medium. It was concluded that the effects on Ni uptake of addition of monovalent, divalent and trivalent cations, and of variations in pH are all consistent with the proposition that the activity of Ni at the membrane surface is the major determinant of the rate of Ni influx into mung bean protoplasts. It is proposed that the surface charge on the plasma membrane will influence the membrane transport of most charged molecules into cells.lld:pubmed
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pubmed-article:11678284pubmed:articleTitleEffect of membrane surface charge on nickel uptake by purified mung bean root protoplasts.lld:pubmed
pubmed-article:11678284pubmed:affiliationDepartment of Environmental Biology, University of Adelaide, SA, Australia.lld:pubmed
pubmed-article:11678284pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:11678284pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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