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. 2020 Feb 24;25(4):1013. doi: 10.3390/molecules25041013

Figure 2.

Figure 2

Figure 2

Figure 2

SEM images of raw rye straw under 50 and 200 or 500 magnification (a), rye straw after pretreatment with water at 121 °C and 1 h (b), rye straw after pretreatment with 5% sulfuric acid at 121 °C and 2 h (c) and 10% sulfuric acid at 121 °C and 1 h (d) and 10% sulfuric acid at 121 °C and 2 h (e).