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. 2018 Aug 27;13(8):e0202079. doi: 10.1371/journal.pone.0202079

Table 1. Model parameters and values used in model, * denotes measured values.

Parameter Description Value Units Ref
Bioreactor Parameters
R1 Inner wall radius 0.75 cm *
R2 Outer wall radius 1.25 cm *
L Scaffold length 7.5 cm *
Growth area of scaffold 158.8 cm2 *
Scaffold volume 13.25 cm3
ε Voidage 0.47 - *
Φ Porosity 0.47 - *
A Surface area to volume ratio of the scaffold 12.013 cm-1 *
N Number of particles per volume of packed bed 36 cm-3 *
dp Particle diameter (equivalent to a sphere) 0.304 cm *
Q Medium flow rate 0.208 cm3/h *
Wall Properties
SPDMS Solubility of oxygen in PDMS 1.3 mM [36]
DPDMS Oxygen diffusion coefficient in PDMS 5x10-5 cm2/s [23]
Fluid Properties
Sm Solubility of oxygen in medium 0.2 mM *
Cin,G Initial glucose concentration 4.81 mM *
Cin,L Initial lactate concentration 1.63 mM *
Dm,O Oxygen diffusion coefficient in medium 3.290x10-5 cm2/s [23]
Dm,G Glucose diffusion coefficient in medium 5.4x10-6 cm2/s [37]
Dm,L Lactate diffusion coefficient in medium 1.1x10-5 cm2/s [38]
ρ Density of water @ 37°C 0.9933 g/cm3 [35]
μ Viscosity of water @ 37°C 0.00692 kg/(m•s) [35]
Cell Properties
Nmax Maximum cell density 23,000 cells/cm2 *
Ni Initial cell value 12013 cells/cm3 *
DN Diffusion coefficient for cell movement 1.38x10-10 cm2/s [39]
Vmax,O Maximum uptake rate of oxygen 100 fmol/h/cell [40]
Vmax,G Maximum uptake rate of glucose 272 fmol/h/cell [40]
YL/G Yield of lactate from glucose 2.0 - [15]
Km,O Michaelis-Menten constant for oxygen uptake 4.05x10-9 mol/cm3 [41]
Km,G Michaelis-Menten constant for glucose uptake 3.5x10-7 mol/cm3 [42]
Kmax Max growth rate 0.02631 hr-1 *
KO Oxygen Michaelis-Menten growth constant 0.001 mM [43]
KG Glucose Michaelis-Menten growth constant 0.006 mM [43]
KL Lactate Michaelis-Menten growth constant 43 mM [15]