Figure 5.

Phosphoglycerate kinase (PGK) activity in diatoms (a–e). All panels show activity measurements of diatom crude protein extracts from cultures grown at low CO₂ (L-CO₂; 400 ppm, dark grey bars) or high CO₂ (H-CO₂; 20,000 ppm, light grey and dashed bars), as specified in panel (a), and without any treatment (none) or treated with 5 mM DTT prior to assay. Average and error bars (SD) are represented (n = 3). * p ≤ 0.05 and ns, not significant.