Fig. 4 Solid state NMR spectra of A, composite sample without addition of glucose; B, pure ¹³C–glucose; C, normal spectrum, and D, difference spectrum (i.e. A subtracted from spectra C) of samples supplemented with glucose and incubated aerobically for four weeks at 25°C and pH 6.8. Spinning side bands of carboxyl C and ¹³C–glucose C are denoted as xx and x, respectively

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