on 100 sputum specimens selected from patients suffering from chronic bronchitis , bronchiectasis , asthma , and cystic fibrosis total deoxyribonucleic acid ( dna ) content has been related to macroscopic type , to total dry weight yield , and to the apparent viscosity of the secretion at 1350 s-1 : since dna may be present , either as fibres or within cells , in one-third of the specimens the contribution of each form to the apparent viscosity was assessed .
C2698628
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C0205447
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