<http://ns.inria.fr/covid19/PMC7442051#body_text>	<http://purl.org/dc/terms/subject>	"Nitrogen(\u22123) compounds" .
<http://ns.inria.fr/covid19/PMC7442051#body_text>	<http://purl.org/dc/terms/subject>	"Famines" .
<http://ns.inria.fr/covid19/PMC7442051#body_text>	<http://purl.org/dc/terms/subject>	"1835 in science" .