No abstract available
MeSH terms
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Ampicillin
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Centrifugation, Density Gradient
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Chloramphenicol
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DNA, Bacterial / analysis*
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DNA, Circular / analysis*
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Escherichia coli / analysis
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Extrachromosomal Inheritance*
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Genetic Code
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Kanamycin
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Mutation
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Nucleic Acid Conformation
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Penicillin Resistance
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Recombination, Genetic
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Salmonella Phages / analysis
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Salmonella typhimurium / analysis*
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Species Specificity
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Streptomycin
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Sulfonamides
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Tetracycline
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Tritium
Substances
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DNA, Bacterial
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DNA, Circular
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Sulfonamides
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Tritium
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Kanamycin
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Chloramphenicol
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Ampicillin
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Tetracycline
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Streptomycin