Assertion: penicillin's effect | /r/HasProperty | antibacterial
Facets:
Source sentences:
text: He determined that penicillin had an antibacterial effect on staphylococci and other gram-positive pathogens.
text: In 1940, Ernst Chain and Edward Abraham reported the first indication of antibiotic resistance to penicillin, an E. coli strain that produced the penicillinase enzyme, which was capable of breaking down penicillin and completely negating its antibacterial effect.