title: Letter: Chemical detection of beta-lactamase activity on Haemophilus influenzae.
mesh_terms: D000667:Ampicillin / Q000494:pharmacology; D001431:Bacteriological Techniques; D006193:Haemophilus influenzae / Q000187:drug effects / Q000201:enzymology*; D008722:Methods; D010403:Penicillin Resistance; D010405:Penicillinase / Q000378:metabolism
chemical_list: D000667:Ampicillin; D010405:Penicillinase