No abstract available
MeSH terms
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Carbon Radioisotopes
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Centrifugation, Density Gradient
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Chromosomes, Bacterial
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Coliphages
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DNA, Bacterial / analysis
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DNA, Circular
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Electrophoresis, Polyacrylamide Gel
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Escherichia coli*
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Genes
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Genetics, Microbial*
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Hybridization, Genetic
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Klebsiella pneumoniae*
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Molecular Biology
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Molecular Weight
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Nitrogen Fixation*
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Nitrogenase / analysis
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Phosphogluconate Dehydrogenase / analysis
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Tritium
Substances
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Carbon Radioisotopes
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DNA, Bacterial
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DNA, Circular
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Tritium
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Phosphogluconate Dehydrogenase
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Nitrogenase