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Negatively charged bacteria combined with positively charged alkaline dye rhodamine 6G (Rh6G) in NaH2PO4–Na2HPO4 buffer solution pH 7.4, by electrostatic interaction. The dyed bacteria exhibited a strong fluorescence peak at 552 nm and fluorescence intensity was directly linear to Escherichia coli (E. coli), Bacillus subtilis (B. subtilis) and Staphylococcus aureus (S. aureus) concentrations in the...
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