Abstract
Manipulation of the ribosome content of E. coli by means of a nutrient shift-up leads to predictable changes in cellular specific gravity. Thus whole-cell pycnography can be used to monitor the proliferative status of the rRNA loci which cluster closely about the genetic origin of DNA synthesis. In this manner the rate of initiating new rounds of genome replication was followed during an upshift. The results indicate that after a short lag initiation of new rounds abruptly and completely shifts to the rate appropriate to the enriched conditions.
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