PubMed · 827174
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E Yourassowsky, M Peromet, E Schoutens. 1976. [Ticarcillin].. https://doi.org/10.1080/17843286.1976.11717061
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Seven spontaneous norfloxacin (NFLX)-resistant mutants obtained in vitro from 20 NFLX-susceptible clinical isolates and 3 NFLX-resistant clinical isolates of Pseudomonas aeruginosa were transformed with the pNF111 plasmid, whose BamHI fragment is responsible for conferring susceptibility to NFLX, by complementing the nfxB mutation. The resulting patterns of MICs of NFLX, beta-lactams, aminoglycosides, and chloramphenicol and the observed increased accumulation of NFLX were consistent with the occurrence of the nfxB type mutation in these clinical isolates.
It was shown that the cultures of Pseudomonas aeruginosa were sensitive to 75-100 micrograms/ml and resistant to 25-50 micrograms/ml of carbenicillin when tested by the method of serial dilutions in the synthetic medium developed by the authors and in Jorgensen's medium. The cultures were incubated for 4 and 16 hours, respectively. The data did not confirm the resistance of the cultures to 25-75 and 100 micrograms/ml carbenicillin when it was determined with the serial dilution method in Pal's medium and the disk diffusion method, respectively. The advantages of the medium developed by the authors for testing P. aeruginosa sensitivity to carbenicillin are discussed.
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