Fig. 2.

Arrhenius plots of 2-protioglyceraldehyde (Left, filled black squares), 2-deuteroglyceraldehyde (Left, open blue squares), and intrinsic KIEs (Right, filled red circles) on the hydride transfers. The intrinsic KIEs were fitted to the Arrhenius equation (SI Appendix, Eq. S3) to obtain an isotope effect on the energy of activation [E_a(H), E_a(D)] and on the preexponential factors (A_H, A_D). Each point represents the average of at least three independent experiments. See SI Appendix for experimental details.