and 3-post : cefsulodin-resistant , elevated beta-lactamase , derived from 3-pre by subculture in the presence of cefsulodin ) were taken as representative of the class of bacteria resistant to third-generation cephalosporins due to elevated synthesis of the normally inducible , chromosomally encoded beta-lactamase .
C0004611
bacteria
C0597979
beta-lactamase