Figure 1.
Active and dormant microbial biomass pools in microbial physiology models (modified from Fig. 2 in Lennon & Jones, 2011).
Figure 2.
Steady state active fraction (rss) and substrate saturation level () as a function of α and β; α = mR/(μG+mR), μG and mR (h−1) are maximum specific growth rate and specific maintenance rate for active microbial biomass, respectivly; β denotes the ratio of dormant specific maintenance rate to mR.
Figure 3.
MEND model simulations against the respiration rates due to added 14C-labeled glucose in Colores et al. [13].
(a) Fitting of the respiration rates in the exponentially-increasing phase using Equation 14, ‘Obs’ and ‘Sim’ denote observed and simulated data, respectively. (b) Fitting of the respiration rates in both exponentially-increasing and non-exponentially-increasing phases using Equation 12. (c) Simulated substrate (S), total live microbial biomass (B), active fraction (r) and substrate saturation level () based on Equation 12.
Table 1.
MEND model parameters values used for simulation of respiration rates due to added 14C-labeled glucose in Colores et al. [13].
Table 2.
MEND model parameter values used for simulation of the experiment described in Fig. 3 of Stolpovsky et al. (2011).
Figure 4.
MEND model simulations against the experimental dataset used by Stolpovsky et al. (2011).
(a) total live biomass, active and dormant biomass, and active fraction; (b) observed and simulated substrate concentration and prescribed O2 concentration. There are three manipulations on the substrate and oxygen: (1) at time 0, the substrate (3 mg/L) and O2 (0.025 mM) are added to the system; (2) after 12 h, the same amount of substrate is injected; (3) at 24 h, additional O2 (0.04 mM) is injected to the system. The observed concentrations of substrate and total biomass are hourly data interpolated from the original observations in Stolpovsky et al. (2011). We scaled the substrate concentrations (with units of mM in original data) to match the magnitude of biomass concentration in units of mg/L.