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Se review committee. Reagents and particles Titanium dioxide (TiO2) was obtained from Baker Chemicals (Phillipsburg, NJ). Latex beads (1.0 m in diameter) that show green fluorescence after excitation at 488 nm were purchased from Interfacial Dynamics Co (Portland, OR). Fluorescently-labeled, heat-killed bacteria (Staphylococcus aureus) were obtained from Molecular Probes (Eugene, OR). All particle

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