_:b57000725	<http://www.w3.org/ns/oa#exact>	"concentrations" .
_:b57000725	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/oa#TextQuoteSelector> .
_:b57000725	<http://www.w3.org/ns/oa#exact>	"concentration" .