Fig. 1From: Comparison of [HSO4]−, [Cl]− and [MeCO2]− as anions in pretreatment of aspen and spruce with imidazolium-based ionic liquidsFluorescence microscopy images of aspen (a), [C4C1im][HSO4]-treated aspen (b), [C4C1im][Cl]-treated aspen (c), and [C4C1im][MeCO2]-treated aspen (d)Back to article page