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. 2021 May 6;14:114. doi: 10.1186/s13068-021-01963-5

Fig. 1.

Fig. 1

Schematics of cellulose ultrastructure: a radial aggregation in cell walls (through hydrogen bonding) of cellulose elementary fibrils into nanofibrils and fibril matrices [14] based on Fengel [11] (with permission from TAPPI ©); b longitudinal cellulose aggregation with crystalline and disordered regions based on Rowland and Roberts [17], I:coalesced surface with high order, II: readily accessible slightly disordered surfaces, III: readily accessible surfaces of strain-disorder tilt and twist regions