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Copyright © 1960 The Biophysical Society. All rights reserved.
Biophysical Journal, Volume 1, Issue 1, 43-53, 1 September 1960
doi:10.1016/S0006-3495(60)86874-9
Articles
Physical Studies on Pox Viruses
J.F. McCrea, John W. Preiss and Jean O'Loughlin
Abstract
Vaccinia virus was irradiated in vacuo with low-voltage electrons of restricted ranges. It was found that the pock-forming ability of the virus was not decreased after bombardment with electrons penetrating 100 A beneath the virus surface. There was very slight reduction in titer with large doses of electrons penetrating 330 A, but a sudden marked drop in infectivity occurred after exposure to electrons penetrating 500 to 700 A. Electrons of higher energies, including those capable of penetrating the virus particle completely, did not produce significant further fall in infectivity titer. It is concluded that a highly radiation-sensitive unit essential for pock formation is situated 500 to 700 A beneath the surface of the virus particle, possibly in the form of a shell. The relation of this finding to the known structure of the virus and to other radiation data on the dimensions of the infectious unit is discussed.
