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Fourier transform infrared (FTIR) curves of inner bamboo (IB) and heat-treated inner bamboo (HIB) before and after delignification and vacuum impregnation (b) is an enlarged view of the dotted box part of (a). (1) IB; (2) HIB; (3) DIB; (4) DHIB; (5) TIB; (6) THIB.
