Rabbit Papilloma and Vaccinia Viruses and T2 Bacteriophage of E. coli in "Shadow" Electron Micrographs.

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Abstract
Electron micrographs of the rabbit papilloma and vaccinia viruses and the T2 bacteriophage of E. coli were obtained with the metal-shadowing technic. The papilloma virus dried in vacuo for application of the metal appeared spheroidal in shape, flattened especially at the region of contact with the film. The vaccinia virus was greatly flattened and showed the presence of a denser internal material bulging beneath the surface. The bacteriophage was a tadpole-shaped structure with a headpiece of well-rounded contours and a stubby tailpiece. The findings were discussed with respect to their bearing on the shape of the viruses in the wet state.

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