About: http://webisa.webdatacommons.org/9308128

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	An optimum contrast agent is one that does not hold its magnetic state in the absence of an employed magnetic field, is not toxic to the human body and does not require quantities which will cause discomfort such as constipation.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com