No abstract available
MeSH terms
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Ampicillin / pharmacology
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Cephaloridine / pharmacology
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Escherichia coli / metabolism*
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Genetics
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In Vitro Techniques
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Penicillin Resistance*
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Penicillinase / biosynthesis*
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Penicillins / pharmacology
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Salmonella typhi / metabolism*
Substances
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Penicillins
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Ampicillin
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Penicillinase
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Cephaloridine