Figure Captions
Figure 1. Schematic overview of the chemostatic experimental
setup: (1) Acid bottle; (2) Base Bottle; (3) the fresh medium container;
(4) Effluent flask; (5) Gas bottle; (6) Cryostat; (7) Thermostat; (8) pH
probe; (9) DO probe; (10) Applikon photobioreactor; (11) Stirrer motor
with four-blade impellers; (12) Condenser; (13) Acid pump; (14) Base
pump; (15) Two-head Masterflex pump using for feed and effluent; (16)
Stirrer speed controller; (17) Air pump; (18) Off-gas analyzer; (19) A
Bio Controller ADI; (20) Mass flow controller; (21) Digital monitor
Flowmeter; (22) PC; (23) Light source
Figure 2. Microscopic pictures of species present in culture
after reaching steady-state under different nitrogen loading rate.
Nitrogen loading rate for A, B, C, D and E series are 10, 20, 32.5, 42
and 63 mgN.l-1.d-1 corresponding to
feed composition of F1, F2,
F3 and F4 for nitrogen limitation and
F5 for light limitation, respectively. The left and
right pictures are under normal and fluorescence light, respectively.
The scale bar represents 30 µm.
Figure 3. The nitrogen to dry weight and active biomass (X)
ratio for different nitrogen loading rates.