µ	specific growth rate
g dw	gram of dry weight
GAM	gas-air mixture
IPP RAS	Institute of Plants Physiology of Russian Academy of Sciences
k	conversion coefficient between optical density measured at 750 nm and dry biomass concentration
Kvent	ventilation coefficient
LED	light-emitting diode
LSIC	laboratory system for intensive cultivation
ρ	biomass concentration
M0	starting weight of dry biomass in the PBR after inoculation
Mdrain	total weight of dry biomass drained from the PBR during the total time of semi-continuous cultivation
Mtotal	total weight of dry biomass accumulated, harvested, and drained from the PBR during the total time of cultivation
MPBR	weight of dry biomass in the working volume of the PBR at the moment
OD750 (or OD750)	optical density at 750 nm
P’sp	specific productivity for the semi-continuous mode
PBR	photobioreactor
PBR FPH	flat-panel horizontal photobioreactor
PBR FPV	flat-panel vertical photobioreactor
Pfin	final productivity
Psp	specific productivity
Tdbl	biomass doubling time
ttotal	total time (duration) of the cultivation
TES	trace element solution
Vtotal	total volume of accumulated, harvested, and drained culture during the total time of cultivation
Vi	volume of culture drained from the PBR during a single drain in semi-continuous cultivation
VPBR	working volume of PBR