title: Screening micro-organisms for cadmium absorption from aqueous solution and cadmium absorption properties of Arthrobacter nicotianae.
abstract: To obtain basic information on how microbial cells absorb cadmium from aqueous solution, we examined cadmium absorption in various micro-organisms. Of 51 micro-organism strains tested, we found that some Gram-positive bacteria, such as, Arthrobacter nicotianae and Bacillus subtilis, and some actinomycetes, such as, Streptomyces flavoviridis and S. levoris were highly capable of absorbing cadmium from an aqueous solution. A. nicotianae absorbed the largest amount of cadmium, over 800 μmol cadmium per gram of dry wt. cells. However, cadmium absorption by A. nicotianae was affected by the solution pH, cadmium concentration, and cell density. The absorption of cadmium was very rapid. Some factors that affected cadmium absorption by A. nicotianae cells were also discussed.
authors.affiliation: a Faculty of Engineering, Department of Biotechnology and Environmental Engineering , Hachinohe Institute of Technology , Hachinohe , Japan.
authors.forename: Takehiko
authors.initials: T
authors.lastname: Tsuruta
authors.forename: Daishi
authors.initials: D
authors.lastname: Umenai
authors.forename: Tomonobu
authors.initials: T
authors.lastname: Hatano
authors.forename: Tsuyoshi
authors.initials: T
authors.lastname: Hirajima
authors.forename: Keiko
authors.initials: K
authors.lastname: Sasaki
mesh_terms: D065966:Absorption, Physicochemical; D001173:Arthrobacter / Q000737:chemistry* / Q000166:cytology / Q000302:isolation & purification*; D002104:Cadmium / Q000737:chemistry*; D018914:Cells, Immobilized / Q000737:chemistry; D004785:Environmental Pollutants / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D012996:Solutions; D013696:Temperature; D014867:Water / Q000737:chemistry*
chemical_list: D004785:Environmental Pollutants; D012996:Solutions; D002104:Cadmium; D014867:Water
keywords: Arthrobacter nicotianae; cadmium absorption; desorption; immobilized cells; micro-organism