Range: ±0.6 unitless
||Bacteria Escherichia coli
||Donachie, W.D., and Robinson, A.C. (1987). Cell division: Parameter values and the process. In Escherichia coli and Salmonella typhimurium, F.C. Neidhardt, J.L. Ingraham, B. Magasanik, K.B. Low, M. Schaechter, and H.E. Umbarger, eds. (Washington, DC: ASM), pp. 1578–1592. p.1580 left column 4th paragraph
|| Woldringh, CL, and Nanninga 1984 Structure of nucleoid and cytoplasm in the intact cell, p.161-197, in N. Nanninga (ed.), Molecular cytology of Escherichia coli. Academic press, Inc., London
||P.1580 left column 4th paragraph: "Direct measurements by electron microscopy (primary source) give a ratio of average length to average width of 4.4±0.6 for E. coli B/r H growing at rates of between 0.4 and 2.9 doublings per hour. There is some evidence (primary source) that the cell shape of this strain changes systematically with growth rate (the ratio of length to width changes from around 5 for the slowest growing cultures to about 3.5 for the fastest)."