Fig. 3

Growth of AOB under varying pH conditions. Effect of pH on nitrite production by Nitrosomonas sp. TNE100 (a) and Nitrosospira sp. TNL100 (c), TNL200 (e), and TNL300 (g). Their respective specific growth rates were derived from log-linear plots of nitrite production during the exponential growth phase (b, d, f, and h). µ, specific growth rate; G, generation time. All data represent the means of triplicate experiments. Error bars denote SD and, in some cases, are contained within the symbols.