Fig. 1
From: Replacing process water and nitrogen sources with biogas slurry during cellulosic ethanol production
![Fig. 1](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs13068-017-0921-y/MediaObjects/13068_2017_921_Fig1_HTML.jpg)
Visualization of corn straw by tabletop microscopy (× 500). a Untreated corn straw, and b corn straw pretreated with biogas slurry, and c corn straw pretreated with fresh water for 6 h at 140 °C with 1.34% NaOH (w/v) and 100 g L−1 substrate concentration