Subjects: Anti-Bacterial Agents/Anti-Bacterial Agents/Anti-Bacterial Agents/*analysis ; Microbial Sensitivity Tests/Microbial Sensitivity Tests/Microbial Sensitivity Tests/*methods; Ampicillin/Ampicillin/Ampicillin/analysis
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Subjects: Ampicillin Resistance/Ampicillin Resistance/Ampicillin Resistance/*physiology ; Chloramphenicol Resistance/Chloramphenicol Resistance/Chloramphenicol Resistance/*physiology ; Escherichia coli/Escherichia coli/Escherichia coli/*drug effects
Subjects: R Factors*; Anti-Bacterial Agents/Anti-Bacterial Agents/Anti-Bacterial Agents/*pharmacology ; Dysentery, Bacillary/Dysentery, Bacillary/Dysentery, Bacillary/*microbiology