THE MACROMOLECULAR PARACRYSTALLINE LATTICE OF INSECT VIRAL POLYHEDRAL BODIES DEMONSTRATED IN ULTRATHIN SECTIONS EXAMINED IN THE ELECTRON MICROSCOPE

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Abstract
Thin sections of polyhedra obtained from gypsy moth larvae infected with Porchetria dispar virus, and from silkworm larvae infected with Bombyx mori virus, revealed viral particles contained within a pseudohexagonal, macromolecular, paracrystalline lattice. The gypsy moth virus occurs in bundles of 1 to 8 rods enclosed by a limiting membrane. The particles of the silkworm virus, although generally occurring singly, also possess a limiting membrane. The macromolecules appear to be dense, discrete particles when cross-sectioned and to form dense bands by superimposition when longitudinally or obliquely sectioned at certain angles. Calculations of macromolecular size were made.

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