Assertion: gram positive bacteria | /r/HasProperty | major producers of antibiotics
Facets:
value: based upon a number of observations
type: OTHER
Source sentences:
text: Based upon a number of observations including that the gram-positive bacteria are the major producers of antibiotics and that, in general, gram-negative bacteria are resistant to them, it has been proposed that the outer cell membrane in gram-negative bacteria (diderms) has evolved as a protective mechanism against antibiotic selection pressure.