Figure 2.

(a) Population of cells with volume Vol growing at a rate μ, described by the model of equations (4.5) and (4.6). The reactions fuelling growth involve intracellular constituents with concentrations x. The dots represent the molecular constituents and the arrows biochemical reactions. (b) Idem, but extended with a bioreactor environment from which the cells take up nutrients and into which they excrete by-products (with concentrations y). This extended system is described by equations (5.4)–(5.7). The boundary of the environment is schematized by the pink rectangle.