Figure 2: Cellulase activities attained on cellulose (a) and lactose (b) by eleven strains of soil fungi isolated from an undisturbed rain forest of Peru. Activities were measured at pH 4.8 (white bars), pH 7.4 (diagonally striped bars), pH 8.4 (horizontally striped bars), and pH 9.4 (black bars). Error bars on the graphs represent four replicates.