id	keyword
american_scientific_journal-3412	min
american_scientific_journal-3412	methane
american_scientific_journal-3412	production
american_scientific_journal-3412	pretreatment
american_scientific_journal-3412	solid
american_scientific_journal-3412	liquid
american_scientific_journal-3412	biomass
american_scientific_journal-3412	steam
american_scientific_journal-3412	substrate
american_scientific_journal-3412	explosion
american_scientific_journal-3412	hydrolysis
american_scientific_journal-3412	effect
american_scientific_journal-3412	vol