@prefix gacs: . @prefix skos: . @prefix rdfs: . @prefix owl: . @prefix rdf: . @prefix dc: . gacs:C2079 skos:definition gacs:def_b4b13a76 . rdfs:label "Concept definition"@en ; a owl:Class . gacs:def_b4b13a76 rdf:value "The availability of a substance to be taken up and used by living biological organisms."@en ; dc:source ; a .