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8.0 – 12.5 eV LDPI-MS of control doped drip flow biofilm (no antibiotic). Includes direct ionization by laser desorption (LD, no VUV) and (SB) synchrotron background at 12.5 eV (no LD). Inset displays expanded m/z 250 – 350 region of 9.0 eV LDPI-MS, with m/z 313 peak truncated.
