is rich medium for ammonia fiber expansion corn stover hydrolysate ammonia-pretreated corn stover hydrolysate colombos:MEDIUM.ACSH PMID: 22389370 Ammonia fiber expansion (AFEX) corn stover hydrolysate (ACSH) colombos:MEDIUM.ACSH:+1 a hydrolysate prepared from corn stover pretreated by ammonia fiber expansion ACSH microbiological culture medium Escherichia coli K-12