FIG. 1.

Assimilation of pectin-related polysaccharides by B. subtilis. (A) Structure of pectin. Symbols of sugars are indicated in the box. (B) Growth of strain 168 cells on different carbon sources: glucose (closed circles), pectin (open triangles), polygalacturonan (closed triangles), and RG-I (closed squares). The nonaddition of saccharides as a carbon source was used as the negative control (open circle). Bacterial growth was determined by measuring turbidity (optical density at 600 nm [OD₆₀₀]).