Figure 2.

Initial Rates of Photosynthesis (O₂ Evolution), Respiration (O₂ Uptake), and H₂ Photoproduction.

(A) Measured rates of photosynthesis and respiration.

(B) Measured rates of H₂ production.

Initial rates were measured using a Clark electrode apparatus. Results are shown for both the background strain CC425 and the sta7-10 mutant. The rates of respiration of the two strains are similar, whereas the rate of O₂ evolution is slightly lower in the sta7-10 mutant. Hydrogen photoproduction rates are substantially attenuated in the sta7-10 mutant. All samples were induced as described in Methods.