FIG. 3.

¹³C NMR spectra of cell extracts obtained at different time points during the metabolism of l-[2-¹³C] arabinose (20 mM) in P. guilliermondii cells, under aerobic conditions, at 30°C. Cells were grown in aerobic batch cultures with l-arabinose (20 g liter⁻¹), harvested at exponential growth phase, and suspended in 50 mM phosphate buffer (pH 6.0) to a concentration of 38 g (dry weight) liter⁻¹. Ara, arabinose; Ara-ol, arabitol; Xyl-ol, xylitol; Tre, trehalose; Rib-ol, ribitol; ▪, Tre C-5. The inset shows magnifications of the shaded areas.