After a period of หยุดยั้งการเจริญเติบโตของเชื้อจุลินทรี,
bacterial เพิ่มจำนวน proceeds in the presence of all concentrations of chlorophyll tested. After repeated culture in the presence of chlorophyll Staph. aureus becomes resistant to the temporary bacteriostatic effect of this substance.
The activity of some antibiotics is potentiated by the presence of subinhibitory concentrations of chlorophyll.