Binding of Dissolved Strontium by Micrococcus luteus.

Abstract:

:Resting cells of Micrococcus luteus have been shown to remove strontium (Sr) from dilute aqueous solutions of SrCl(2) at pH 7. Loadings of 25 mg of Sr per g of cell dry weight were achieved by cells exposed to a solution containing 50 ppm (mg/liter) of Sr. Sr binding occurred in the absence of nutrients and did not require metabolic activity. Initial binding was quite rapid (<0.5 h), although a slow, spontaneous release of Sr was observed over time. Sr binding was inhibited in the presence of polyvalent cations but not monovalent cations. Ca and Sr were bound preferentially over all other cations tested. Sr-binding activity was localized on the cell envelope and was sensitive to various chemical and physical pretreatments. Bound Sr was displaced by divalent ions or by H. Other monovalent ions were less effective. Bound Sr was also removed by various chelating agents. It was concluded that Sr binding by M. luteus is a reversible equilibrium process. Both ion exchange mediated by acidic cell surface components and intracellular uptake may be involved in this activity.

journal_name

Appl Environ Microbiol

authors

Faison BD,Cancel CA,Lewis SN,Adler HI

doi

10.1128/AEM.56.12.3649-3656.1990

keywords:

subject

Has Abstract

pub_date

1990-12-01 00:00:00

pages

3649-56

issue

12

eissn

0099-2240

issn

1098-5336

journal_volume

56

pub_type

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