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. 1986 Nov;168(2):613–618. doi: 10.1128/jb.168.2.613-618.1986

Increase in cell mass during the division cycle of Escherichia coli B/rA.

H E Kubitschek
PMCID: PMC213524  PMID: 3536854

Abstract

Increase in the mean cell mass of undivided cells was determined during the division cycle of Escherichia coli B/rA. Cell buoyant densities during the division cycle were determined after cells from an exponentially growing culture were separated by size. The buoyant densities of these cells were essentially independent of cell age, with a mean value of 1.094 g ml-1. Mean cell volume and buoyant density were also determined during synchronous growth in two different media, which provided doubling times of 40 and 25 min. Cell volume and mass increased linearly at both growth rates, as buoyant density did not vary significantly. The results are consistent with only one of the three major models of cell growth, linear growth, which specifies that the rate of increase in cell mass is constant throughout the division cycle.

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Selected References

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