title: Bioaccumulation characterization of cadmium by growing Bacillus cereus RC-1 and its mechanism.
abstract: In an effort to explore the protective mechanism of growing Bacillus cereus RC-1 against the toxicity of different Cd(II) concentrations, bacterial growth, cadmium consumption, surface interactions and intra- and extra-cellular Cd(II) contents were examined. Cellular morphology and growth were evidently affected by the initial metal concentrations above 20 mg L(-1), according to the analysis of SEM, AFM, TEM and UV spectrophotometer. Surface complexation and electrostatic attraction played an important role in the different Cd(II) concentrations, as determined by the FTIR and Zeta potential analysis. Intracellular accumulation was the predominant mechanism in culture with lower metal concentrations (below 20 mg L(-1)), but was overshadowed by extracellular adsorption at higher concentrations. This suggested that the growing cells might employ one dominant mechanism at lower concentrations and then shift to another at higher concentrations. These results suggest options could be exploited for bioremediation of aqueous solution in which the Cd(II) concentration is less than 20 mg L(-1).
authors.affiliation: School of Environment and Energy, South China University of Technology, Guangzhou 510006, PR China; Key Laboratory of Agro-Environment in the Tropics, Ministry of Agriculture, South China Agricultural University, Guangzhou 510642, PR China.
authors.forename: Fei
authors.initials: F
authors.lastname: Huang
authors.affiliation: School of Environment and Energy, South China University of Technology, Guangzhou 510006, PR China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, South China University of Technology, Guangzhou 510006, PR China.
authors.forename: Chu-Ling
authors.initials: CL
authors.lastname: Guo
authors.affiliation: School of Environment and Energy, South China University of Technology, Guangzhou 510006, PR China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, South China University of Technology, Guangzhou 510006, PR China. Electronic address: lutao@scut.edu.cn.
authors.forename: Gui-Ning
authors.initials: GN
authors.lastname: Lu
authors.affiliation: School of Environment and Energy, South China University of Technology, Guangzhou 510006, PR China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, South China University of Technology, Guangzhou 510006, PR China.
authors.forename: Xiao-Yun
authors.initials: XY
authors.lastname: Yi
authors.affiliation: Faculty of Technology, University of Vaasa, FI-65101 Vaasa, Finland.
authors.forename: Lian-Dong
authors.initials: LD
authors.lastname: Zhu
authors.affiliation: School of Environment and Energy, South China University of Technology, Guangzhou 510006, PR China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, South China University of Technology, Guangzhou 510006, PR China. Electronic address: chzdang@scut.edu.cn.
authors.forename: Zhi
authors.initials: Z
authors.lastname: Dang
mesh_terms: D000327:Adsorption; D001409:Bacillus cereus / Q000254:growth & development / Q000378:metabolism*; D001673:Biodegradation, Environmental; D002104:Cadmium / Q000032:analysis / Q000378:metabolism*; D006863:Hydrogen-Ion Concentration; D013056:Spectrophotometry, Ultraviolet; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000378:metabolism*
chemical_list: D014874:Water Pollutants, Chemical; D002104:Cadmium
keywords: Bacillus cereus; Cadmium; Extracellular adsorption; Growing cells; Intracellular accumulation