About: http://webisa.webdatacommons.org/302898108

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	When the sample material is a liquid such as urine or serum, head-space vapor assays may be carried out by analysis of vapor in equilibrium with the liquid for the presence of acetone and other volatile ketone and aldehyde components.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com