Fig. 10 Carbon types identified by solution NMR or gas analysis produced from the degradation of ¹³C–glucose in samples incubated anaerobically at A, 15°C and pH 4.3; B, 25°C and pH 4.3; C, 15°C and pH 6.8; D, 25°C and pH 6.8. Note that the scale is magnified for some bars. Very low or zero amounts are written in the Figure for the specific compound