Additional file 2.

Fluorescence microscopy of labeled E. coli bacteria.E. coli labeled with Syto 9 (green) and rhodamine-coated iron oxide particles (red) by using either (A) amine-coated 5-nm IONPs or (B) citrate-coated 5-nm IONPs.

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Hoerr et al. BMC Biology 2013 11:63   doi:10.1186/1741-7007-11-63