Fig. 1 Solution NMR spectra of aerobically degraded ¹³C glucose in samples incubated for four weeks. Assignments are presented in Table 2 except for PS (Fig. 1D) which refers to resonance from polysaccharide C. A, unsupplemented sample with addition of 10 mM ¹³C glucose just before the NMR analysis. B, 15°C and pH 4.3; C, 25°C and pH 4.3; D, 15°C and pH 6.8 E, 25°C and pH 6.8. (=) and (= =) refers to monounsaturated C and polyunsaturated carbons, respectively. Note that the scale of relative intensity is magnified in fig. 1E and 1D