Evaluation of Antibiotic Efficacy Using Electron Microscopy: Morphological Effects of Guanylureido Cephalosporin, Chlorobenzoylureido Cephalosporin, BL-P1654, and Carbenicillin on Pseudomonas aeruginosa

Author:

Ellis L. F.1,Herron D. K.1,Preston D. A.1,Simmons L. K.1,Schlegel R. A.1

Affiliation:

1. Lilly Research Laboratories, Division of Eli Lilly and Company, Indianapolis, Indiana 46206

Abstract

The response of Pseudomonas aeruginosa to carbenicillin, BL-P1654, and two cephalosporins (112384 and 112883) was evaluated by minimal inhibitory concentration determinations, [ 14 C]leucine uptake studies, morphological studies of colonial growth, and mouse intraperitoneal inoculations. Spheroplast formation and bacterial lysis were not the early response; instead, cell division was inhibited and long filaments were formed. Spheroplast formation and bacterial lysis were not observed in the first 7 h of incubation in minimal inhibitory concentrations of antibiotic.

Publisher

American Society for Microbiology

Subject

Infectious Diseases,Pharmacology (medical),Pharmacology

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