Table 1.

MRSA Growth Inhibition Assay in the Presence of Ampicillin and low-M_W BPEI

MRSA cells (ATCC 700787) were used to inoculate growth media containing ampicillin and low-M_W BPEI at 37 °C for 20 hours. Table entries are the optical density (OD) of the growth media measured at a wavelength of 600 nm. Each entry is the average of duplicate measurements. The bold line separates combinations that allowed MRSA growth (OD₆₀₀ values above 0.05) from those combinations that prevented MRSA growth. The ampicillin MIC is 32 μg/mL demonstrating antibiotic resistance without the presence of BPEI. Values highlighted in bold text were determined to arise from synergy between ampicillin and BPEI.