Figure 2-2. Electron micrographs of S. enterica grown under different conditions. A. S.
           enterica grown aerobically on PD minimal medium. B. S. enterica grown
           aerobically on glucose minimal medium. Both pictures were kindly provided by Dr. Henry Aldrich. Polyhedral organelles are present in the cells grown on
           PD (arrows) but not in those grown on glucose. Bars in lower right-hand
           corners are 100 nm in length.