Effects of Chlorophyll-Derived Efflux Pump Inhibitor Pheophorbide a and Pyropheophorbide a on Growth and Macrolide Antibiotic Resistance of Indicator and Anaerobic Swine Manure Bacteria

Table 1

Culture counts of anaerobic bacteria from stored swine manure.

Viable counts: swine slurry medium*
	+H2O/EtOH		+erythromycin		+tylosin
−pyp	1.26 × 10^9	(±0.13 × 10^9)	1.01 × 10^9	(±0.30 × 10^9)	1.07 × 10^9	(±0.15 × 10^9)
+pyp	8.99 × 10^8	(±1.69 × 10^8)	8.90 × 10^8	(±2.66 × 10^8)	1.09 × 10^9	(±0.22 × 10^9)

 *(CFU mL⁻¹) on swine slurry medium supplemented with pyropheophorbide a (pyp, 10 µg mL⁻¹) alone and in combination with erythromycin, tylosin (10 µg mL⁻¹, individually) or water and ethanol (H₂O/EtOH, control). Values are averages and standard deviations from three repeated experiments with duplicates.