PMC:7796291 / 9310-9585 JSONTXT

{"project":"LitCovid-sentences","denotations":[{"id":"T83","span":{"begin":56,"end":191},"obj":"Sentence"},{"id":"T84","span":{"begin":193,"end":197},"obj":"Sentence"},{"id":"T85","span":{"begin":198,"end":213},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"port, NY, USA), by holding the filter media in the air. A charge-monitoring probe was placed 4 cm above the web surface, and the surface potential was measured by line-scanning over the area.\n\n2.4. Filtration Test\nThe filtration performance of respirators was evaluated using"}