PMC:7784787 / 4381-5616 JSONTXT

{"project":"LitCovid-PubTator","denotations":[{"id":"72","span":{"begin":395,"end":410},"obj":"Chemical"},{"id":"73","span":{"begin":442,"end":455},"obj":"Chemical"},{"id":"74","span":{"begin":564,"end":569},"obj":"Chemical"},{"id":"75","span":{"begin":341,"end":345},"obj":"Disease"}],"attributes":[{"id":"A72","pred":"tao:has_database_id","subj":"72","obj":"MESH:D010577"},{"id":"A73","pred":"tao:has_database_id","subj":"73","obj":"MESH:D011126"},{"id":"A74","pred":"tao:has_database_id","subj":"74","obj":"MESH:D009757"},{"id":"A75","pred":"tao:has_database_id","subj":"75","obj":"MESH:D012640"}],"namespaces":[{"prefix":"Tax","uri":"https://www.ncbi.nlm.nih.gov/taxonomy/"},{"prefix":"MESH","uri":"https://id.nlm.nih.gov/mesh/"},{"prefix":"Gene","uri":"https://www.ncbi.nlm.nih.gov/gene/"},{"prefix":"CVCL","uri":"https://web.expasy.org/cellosaurus/CVCL_"}],"text":"While many recent studies have focused on the penetration of aerosols through various domestic fabrics [19], comparatively fewer studies have looked at outward leakage as opposed to inward leakage. Better fitting medical or N95 masks have been found to significantly improve the source control of particles from a dummy head [17] and better fits have been achieved with an improved mask design, petroleum jelly [20], adhesive tape or fluffed polypropylene fibers [21]. For cloth masks, the only study explicitly addressing fit found a large benefit from wearing a nylon stocking worn over the top of a mask [22], although they measured inward leakage only. Other studies that measured the overall outward mask performance by collecting air around the head did not attempt to separate leakage from fabric penetration as a parameter which contributes to the mask efficiency [23,24]. The extractive techniques used in many of these studies cannot alone distinguish between leakage and penetration. Laser sheets, on the other hand, can visualize the leakage in situ. A flat laser sheet is not optimal for this purpose, for example in the study of Fischer et al. [25], it is not clear whether leakages would be detected in their laser beam."}

{"project":"LitCovid-sentences","denotations":[{"id":"T39","span":{"begin":0,"end":197},"obj":"Sentence"},{"id":"T40","span":{"begin":198,"end":468},"obj":"Sentence"},{"id":"T41","span":{"begin":469,"end":656},"obj":"Sentence"},{"id":"T42","span":{"begin":657,"end":880},"obj":"Sentence"},{"id":"T43","span":{"begin":881,"end":994},"obj":"Sentence"},{"id":"T44","span":{"begin":995,"end":1062},"obj":"Sentence"},{"id":"T45","span":{"begin":1063,"end":1235},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"While many recent studies have focused on the penetration of aerosols through various domestic fabrics [19], comparatively fewer studies have looked at outward leakage as opposed to inward leakage. Better fitting medical or N95 masks have been found to significantly improve the source control of particles from a dummy head [17] and better fits have been achieved with an improved mask design, petroleum jelly [20], adhesive tape or fluffed polypropylene fibers [21]. For cloth masks, the only study explicitly addressing fit found a large benefit from wearing a nylon stocking worn over the top of a mask [22], although they measured inward leakage only. Other studies that measured the overall outward mask performance by collecting air around the head did not attempt to separate leakage from fabric penetration as a parameter which contributes to the mask efficiency [23,24]. The extractive techniques used in many of these studies cannot alone distinguish between leakage and penetration. Laser sheets, on the other hand, can visualize the leakage in situ. A flat laser sheet is not optimal for this purpose, for example in the study of Fischer et al. [25], it is not clear whether leakages would be detected in their laser beam."}