Fig. 3From: Effect of thermochemical pretreatment on lignin alteration and cell wall microstructural degradation in Eucalyptus globulus: comparison of acid, alkali, and water pretreatmentsTransverse surface of E. globulus observed under a SEM. The wood is build up mainly of fibers (F) and vessel elements (V). Ray parenchyma cells (R) run in the radial direction. Scale bar 100 μmBack to article page