| %3HV | 3HV fraction in total PHA (mol 3HV/mol PHA) |
| %3HVinst | Instantaneous 3HV content (mol 3HV/mol PHA) |
| %PHA | PHA intracellular content (gPHA/gVSS) |
| %PHA0 | Initial PHA intracellular content (gPHA/gVSS) |
| Fraction of propionic acid uptake to total carbon uptake flux | |
| 3HB | 3-Hydroxybutyrate |
| 3HV | 3-Hydroxyvalerate |
| AcCoA | Acetyl-CoA |
| ATP | Adenosine triphosphate |
| CO2 | Carbon dioxide |
| CoA | Coenzyme A |
| COD | Chemical oxygen demand |
| fPHA | PHA fraction with respect to active biomass (PHA/X) |
| HAc | Acetic acid |
| HPr | Propionic acid |
| NAD+ | Nicotinamide adenine dinucleotide (oxidised) |
| NADH | Nicotinamide adenine dinucleotide (reduced) |
| NADP+ | Nicotinamide adenine dinucleotide phosphate (oxidised) |
| NADPH | Nicotinamide adenine dinucleotide phosphate (reduced) |
| PHA | Poly(3-hydroxyalkanoate) or PHA concentration at certain time |
| PHA0 | Initial PHA concentration |
| PHB | Poly(3-hydroxybutyrate) |
| PHV | Poly(3-hydroxyvalerate) |
| PrCoA | Propionyl-CoA |
| qHAc | Acetic acid specific consumption rate (Cmol HAc/Cmol X·h) |
| qHB | Specific 3HB monomer synthesis rate (Cmol 3HB/Cmol X·h) |
| qHPr | Propionic acid specific consumption rate (Cmol HPr/Cmol X·h) |
| qHV | Specific 3HV monomer synthesis rate (Cmol 3HV/Cmol X·h) |
| qPHA | Specific PHA synthesis rate (Cmol PHA/Cmol X·h) |
| qS | Specific VFA consumption rate (Cmol VFA/Cmol X·h) |
| RQ | Respiratory quotient |
| TCA | Tricarboxylic acid cycle |
| v | Reaction rate (Cmol/Cmol X·h) |
| VFA | Volatile fatty acid |
| VSS | Volatile suspended solids |
| X | Active biomass |
| X0 | Initial active biomass |
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