Fig. 4From: Overcoming biomass recalcitrance by synergistic pretreatment of mechanical activation and metal salt for enhancing enzymatic conversion of lignocelluloseSEM micrographs of a untreated SCB and the SCB samples pretreated by different methods: b MA, c MA + AlCl3, d MA + FeCl3, e MA + Al(NO3)3, and f MA + Fe(NO3)3Back to article page