Figure 5From: Expression of urease by Haemophilus influenzaeduring human respiratory tract infection and role in survival in an acid environmentOptimal pH of urease activity. Urease activities of H. influenzae protein extracts were assayed in buffers of varying pH as noted on X-axis. Y-axis is urease activity in μmols of urea hydrolyzed per min. Each point is the average of 3 independent experiments and error bars indicate standard deviations.Back to article page