Fig. 4

Profiles of mass transfer properties. a Mean mass transfer coefficient. Error bars are calculated by combining errors using error propagation equations. b Mean geometric cell surface area. For a and b, the red trend lines are to guide the eye and are not regression models. The black trend line and black dotted lines show the average value of the properties ± 1 SEM, respectively, over the duration of the experiment for the cells in continuously diluted culture. Fluctuations about this average are attributed to batch-to-batch error in cell length measurements. c Mean cell surface-to-volume ratio. Area and surface-to-volume ratios for each day were predicted from the regression curves in Fig. 2c, d, respectively, using the length data in Fig. 2a. Error bars show the difference between the predictions obtained from the regression curves and the 95% confidence bounds. d Estimated mean ferricyanide concentration difference between bulk medium and cell surface. Error bars are calculated by combining errors in r, k and A using error propagation equations. Both black and red trend lines are to guide the eye and are not regression models