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- W4245958183 abstract "Cell envelopes of Pseudomonas fluorescens, cytoplasmic membrane, peptidoglycan and outer membrane were obtained from a fractionation procedure and tested for their metal binding capacity. Isolated envelopes (cytoplasmic membrane, peptidoglycan and outer membrane) were chemically modified and functional carboxyl groups transformed to electropositive amine groups, using carbodiimide ethylenediamine. Transformation of carboxyl groups was evaluated by measuring total amine groups in all fractions (modified or not). Using equilibrium dialysis and Scatchard plots for the data, we have established that isolated unmodified cell envelopes (cytoplasmic membrane, peptidoglycan and outer membrane) possess at least two types of metal binding sites with different association constants (Ka and K′a). Introduction of positive charges into the bacterial envelopes resulted in the disappearance of one type of metal binding site which had the highest association constant value for Ni2+, Cu2+ and Zn2+. All fractions, modified or not, always presented at least two types of binding sites with different association constants for Cd2+." @default.
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- W4245958183 date "1993-04-15" @default.
- W4245958183 modified "2023-09-30" @default.
- W4245958183 title "Binding of Cd2+, Ni2+, Cu2+ and Zn2+ by isolated envelopes of Pseudomonas fluorescens" @default.
- W4245958183 doi "https://doi.org/10.1016/0378-1097(93)90566-k" @default.
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