Fig. 3 Carbon types identified by solution NMR and CO₂ produced from the degradation of ¹³C–glucose in the samples incubated aerobically for four weeks 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

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