FIG. 2.

Carbon (A) and hydrogen (B) stable isotope fractionation during degradation of toluene by P. putida mt-2 (▪), R. pickettii PKO1 (▴), and P. putida F1 (•) and isotope fractionation during degradation of naphthalene by P. putida NCIB 9816 (⧫). ¹³C/¹²C carbon isotope fractionation was plotted according to equation 1. D/H isotope fractionation was determined with equation 3 during growth with equal amounts of per-deuterated toluene-d₈ and toluene and per-deuterated naphthalene-d₈ and naphthalene.