| 摘要 |
2129996 9413782 PCTABS00032 Microbial biomass cells wherein at least one metal cationic species is attached to the surface of said cells in an amount sufficient to render the said cells effective to bind anions thereto, and wherein at least one anionic species is also bound to the surface of said cells. The invention also provides a method of making microbial biomass cells as claimed in any preceding claims which comprises: providing biomass cells within a culture medium, removing said cells from said medium and washing them, suspending the cells in a buffer medium, adding a quantity of the required cationic species in aqueous solution optionally to saturation of the binding sites therefor on the cell wall, adding a quantity of the required anionic species in aqueous solution optionally to saturation of the binding sites therefor on the cell wall, removing the treated biomass and washing, and drying the cells to form a solid product. A digestible, mineral-containing composition is also provided which contains biomass cells. For environmental clean-up applications there is also provided a method of reducing the concentration of at least one anionic species in an aqueous composition containing said species, which comprises bringing said aqueous composition into intimate contact with microbial biomass cells, to which at least one metal cationic species has been bound in a quantity sufficient to render said biomass cells receptive to bind said at least one anionic species, and optionally causing the said biomass cells to become regenerated with the same or different metal cationic species after anionic species have become bound to said biomass. |
