PMC:7796291 / 9154-9309 JSONTXT

{"project":"LitCovid-sentences","denotations":[{"id":"T80","span":{"begin":12,"end":16},"obj":"Sentence"},{"id":"T81","span":{"begin":17,"end":48},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"idue [37].\n\n2.3. Electrostatic Force Measurement\nThe surface potential of filter media was measured using an electrostatic voltmeter (Model 542A, Trek, Loc"}