Fig. 2
From: Formate-driven H2 production by whole cells of Thermoanaerobacter kivui
Influence of cell densities on volumetric and specific H2 production rates of T. kivui. Resting cells (0.3–4 mg mL−1) were added to preheated (60 °C) imidazole buffer (50 mM imidazole, 20 mM MgSO4, 20 mM KCl, 2 mM DTE, 4 µM resazurin, pH 7) under a N2 atmosphere. The reaction was started by addition of 300 mM of sodium formate. Specific H2 production rate (open squares) and volumetric H2 production rate (black squares) are plotted against the cell densities. The specific H2 production rates were calculated based on the first 15 min after start of the reaction. All data points are mean ± SD, N = 2