Replication of Deoxyribonucleic Acid in Non-dividing Bacteria

@article{Nakada1961ReplicationOD,
  title={Replication of Deoxyribonucleic Acid in Non-dividing Bacteria},
  author={Daisuke Nakada and Francis J. Ryan},
  journal={Nature},
  year={1961},
  volume={189},
  pages={398-399}
}
DEOXYRIBONUCLEIC acid (DNA) is thought to be formed by replication. Meselson and Stahl1 have used a density-gradient centrifugation technique to show that bacterial DNA is bipartite as was proposed by Watson and Crick2 and that it reproduces in a semi-conservative fashion3, each original sub-unit being found associated, on replication, with a newly formed sub-unit. 
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References

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TLDR
The detailed structure described by Crick and Watson has been shown to have too large a diameter, and a drawing has been given of an improved model which is in fairly good agreement with the s-ray data.
THE REPLICATION OF DNA IN ESCHERICHIA COLI.
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TLDR
A method was developed for the detection of small density differences among macromolecules and the distribution of the heavy nitrogen isotope N15 among molecules of DNA following the transfer of a uniformly N15-labeled, exponentially growing bacterial population to a growth medium containing the ordinary nitrogen isotopes.
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