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MACROMOLECULAR PARACRYSTALLINE LATTICE OF INSECT VIRAL POLYHEDRAL BODIES DEMONSTRATED

Some insect viruses are characterized by the formation of polyhedral bodies within the nuclei of host cells. Verson (1) was the first to describe such bodies as crystals and Bolle (2) discovered that they were composed of protein. Within the polyhedra Komarek and Breindl (3) demonstrated by histochemical methods numerous small particles, which they believed to be the infectious viral agents. These were subsequently isolated (4) and shown in the electron microscope to be generally rod-shaped and to occur frequently in bundles contained within a limiting membrane (5, 6). Although previous at tempts (7) to demonstrate the virus within sectioned polyhedra have been unsuccessful, because the sections were too thick to permit adequate penetration of the electron beam, a suggestion of a macromolecular lattice was observed on the cut surface of one polyhedron after shadowing (8). The purpose of the present communication is to illustrate and describe thin sections of polyhedra showing the viral particles enclosed within a macromolecular, paracrystalline lattice.