Dynamics of phosphate uptake rates throughout batch cultures of <i>C</i>. <i>peruvianus</i> in F/2 medium.

(a) Average cell concentrations (and standard deviations) plotted over the duration of the batch culture.in days. The phases of the growth curve are indicated. (b) Cellular phosphate uptake rates calculated as phosphate uptake divided by cell numbers at the days of phosphate quantification (blue, or lower values) and divided by the cell numbers at the day of the measurement before (orange, or higher values). The dashed line indicates lower and upper borders between the two calculation methods. The true uptake rate must be between the two borders. Note the steep drop of phosphate uptake rates during exponential growth.