%0 Journal Article %A Chevallier, Dominique %A Engel, Andréas %A Wurtz, Michel %A Putz, Charles %T The Structure and Characterization of a Closterovirus, Beet Yellows Virus, and a Luteovirus, Beet Mild Yellowing Virus, by Scanning Transmission Electron Microscopy, Optical Diffraction of Electron Images and Acrylamide Gel Electrophoresis %D 1983 %J Journal of General Virology, %V 64 %N 10 %P 2289-2293 %@ 1465-2099 %R https://doi.org/10.1099/0022-1317-64-10-2289 %K structure %K beet yellows virus %K beet mild yellowing virus %I Microbiology Society, %X SUMMARY Attempts were made to determine more precisely the structure and properties of a closterovirus, beet yellows virus (BYV), and a luteovirus, beet mild yellowing virus (BMYV), by scanning transmission electron microscopy, optical diffraction of electron images and acrylamide gel electrophoresis. It was shown that BYV has a mol. wt. of 76.5 × 106, including an RNA of 4.15 × 106. The pitch of the helix is 3.7 nm and there would be 8.5 protein subunits per turn. BMYV particles have a diameter of 26 nm and a total mol. wt. of 6.5(±0.45) × 106. The mol. wt. of the protein subunit is about 24000 and that of the RNA 2 × 106. %U https://www.microbiologyresearch.org/content/journal/jgv/10.1099/0022-1317-64-10-2289