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  • Title: Estimation of the D period from residual division after exposure of exponential phase bacteria to chloramphenicol.
    Author: Kubitschek HE.
    Journal: Mol Gen Genet; 1974; 135(2):123-30. PubMed ID: 4617165.
    Abstract:
    Values of the D period, between termination of chromosome replication and cell division, were determined from measurements of residual cell division after exposure of exponential phase cultures of Escherichia coli B/r and K12 and of Salmonella typhimurium to chloramphenicol. The results obtained by this method were compared with earlier results for E. coli B/r obtained from measurements of DNA content per cell and were found to be almost identical. For each, values of the D period were independent of growth rate, and the average value of D-26.1 plus or minus 1.2 min obtained by residual division is in good agreement with the value of 25 min obtained earlier. These results indicate that the method of residual division provides a good measure of the duration of the D period. Values of D were also independent of growth rate for each of the other strains.
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