Fig. 3. Analytical plots for data presented in Fig. 2 using (A) Michaelis-Menten analyses by Lineweaver-Burk regression (double reciprocal plot) illustrating the competitive relationship between lead and calcium uptake in the rainbow trout, and (B) regression analyses of apparent K_m/J_max vs. waterborne lead concentration (using apparent K_m and J_max values presented in Table 1. The regression equation was y=2.38x+1.12 (r²=0.95). The inhibitor constant (-K_i,Pb, the x-intercept of the regression line) was 0.48 µmol l^-1 lead.