Abstract

Spherical virus-like particles (VLPs_ isolated from Helminthosporium maydis ATCC 32450 are 48 in diameter and have three serologically identical components which have the following properties: s 20,w = 152, 212, and 283; ϱ (in CsCl) = 1.298, 1.378, and 1.438 g cm −3; percentage of RNA = 0, 17, and 32; and molecular weight = 14, 17, and 21 × 10 6. The nucleic acid of the fastest sedimenting component is double-stranded and has the following properties: s 20,w = 20.69; T m = 79.6°; ϱ (in Cs 2SO 4) = 1.6062 g cm −3.; molecular weight = 6.3 ± 0.5 × 10 6.

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