Binding of dissolved strontium by Micrococcus luteus

Journal Article · Sat Dec 01 00:00:00 EST 1990 · Applied and Environmental Microbiology; (USA)

OSTI ID:6055663

Faison, B D; Cancel, C A; Lewis, S N; Adler, H I ^[1]

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1. Oak Ridge National Laboratory, TN (USA)

Resting cells of Micrococcus luteus have been shown to remove strontium (Sr) from dilute aqueous solutions of SrCl{sub 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{sup +}. 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.

• OSTI ID: 6055663
• Journal Information: Applied and Environmental Microbiology; (USA), Vol. 56:12; ISSN 0099-2240
• Country of Publication: United States
• Language: English

Related Subjects

63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
MICROCOCCUS LUTEUS
PHYSIOLOGY
STRONTIUM
SORPTION
AQUEOUS SOLUTIONS
CALCIUM
CHELATING AGENTS
ION EXCHANGE
REMOVAL
UPTAKE
ALKALINE EARTH METALS
BACTERIA
DISPERSIONS
ELEMENTS
METALS
MICROCOCCUS
MICROORGANISMS
MIXTURES
SOLUTIONS
560162* - Radionuclide Effects
Kinetics
&amp; Toxicology- Animals
Plants
Microorganisms
&amp; Cells