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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 Km/Jmax vs. waterborne lead concentration (using apparent Km and Jmax values presented in Table 1. The regression equation was y=2.38x+1.12 (r2=0.95). The inhibitor constant (-Ki,Pb, the x-intercept of the regression line) was 0.48 µmol l-1 lead.





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