title: Cadmium recovery by a sulfate-reducing magnetotactic bacterium, Desulfovibrio magneticus RS-1, using magnetic separation.
abstract: Cadmium recovery by a sulfate-reducing magnetotactic bacterium, Desulfovibrio magneticus strain RS-1, was investigated. D. magneticus precipitated >95% of cadmium at an initial concentration of 1.3 ppm in the growth medium. Electron microscopic analysis revealed that D. magneticus formed electron-dense particles on its surface when cultivated in the presence of cadmium ions (Cd2+). Sulfide was also found in the precipitate, and the composition ratio of sulfide/cadmium was 0.7. Sixty percent of viable RS-1 cells was recovered by a simple magnetic separation revealing the removal of 58% cadmium from the culture medium.
authors.affiliation: Department of Biotechnology, Tokyo University of Agriculture and Technology, Koganei, Japan.
authors.forename: Atsushi
authors.initials: A
authors.lastname: Arakaki
authors.forename: Haruko
authors.initials: H
authors.lastname: Takeyama
authors.forename: Tsuyoshi
authors.initials: T
authors.lastname: Tanaka
authors.forename: Tadashi
authors.initials: T
authors.lastname: Matsunaga
mesh_terms: D002104:Cadmium / Q000302:isolation & purification* / Q000494:pharmacology*; D002118:Calcium / Q000494:pharmacology; D002458:Cell Fractionation; D003470:Culture Media; D003901:Desulfovibrio / Q000187:drug effects / Q000254:growth & development / Q000378:metabolism* / Q000648:ultrastructure; D007700:Kinetics; D008280:Magnetics; D008854:Microscopy, Electron; D010084:Oxidation-Reduction; D013431:Sulfates / Q000378:metabolism*
chemical_list: D003470:Culture Media; D013431:Sulfates; D002104:Cadmium; D002118:Calcium