id	keyword
brj-25215	heartwood
brj-25215	sapwood
brj-25215	et al
brj-25215	chemical
brj-25215	fordii
brj-25215	lignin
brj-25215	article
brj-25215	content
brj-25215	extractives
brj-25215	liu
brj-25215	cm⁻¹
brj-25215	cellulose
brj-25215	composition