Focus assay and defectiveness of avian myeloblastosis virus.
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Biomedical subjects
Publications and source records attributed to L Gazzolo.
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Deoxyribonucleic acid (DNA) extracted from purified virions of Shope fibroma virus (SFV) (by using DNA from Microccocus lysodeikticus as marker) had a buoyant density of 1.6996 +/- 0.0003 g/ml), hence a guanine plus cytosine (G + C) content of 40.4 +/- 0.3%, which is close to the G + C content of the DNA of susceptible rabbit cells (40.9 +/- 0.4%) and different from that of vaccinia virus DNA (35.5 +/- 0.4%). For the determination of the molecular weight of DNA, SFV and vaccinia purified virions, treated with Pronase and detergent, were cosedimented in sucrose density gradients. Results showed that SFV-DNA has a molecular weight of about 153 x 10(6) daltons. By electron microscopy, only one molecule corresponding to this value was observed (its length was 80.3 mum). The others had a median size of 49.8 mum +/- 0.9.
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