Fig. 7
Electron micrographs of alfalfa mosaic virus particles that have been negatively stained. Electron micrograph of viral particles labelled with 2% uranyl acetate. a Virus particles having a characteristic bacilliform structure with long particles measuring 110Â nm long are indicated by arrows. b The 68Â nm long bacilliform particles are indicated by arrows. c 18Â nm diameter spheroidal particles. The magnification is 150000x. The scale bar is 100Â nm