Figure 6From: Expression of urease by Haemophilus influenzaeduring human respiratory tract infection and role in survival in an acid environmentExpression of urease. Urease activity in the presence of varying concentrations of ammonium chloride as noted on the Y-axis. Results are expressed as a per cent of maximum activity (X-axis) in the absence of added ammonium chloride. Each bar is the average of three independent experiments and the error bars indicate standard deviations.Back to article page