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Plot of the primary kinetic isotope effects for the acid-catalysed rate constant k’H/k’D vs. Eo (QH• / QH2) in the reduction of p-benzoquinone derivatives by AcrH2 and AcrD2 in H2O-EtOH (5:1 v/v) at 298 K. Reproduced from [244] with permission of the Royal Society of Chemistry.
