FIGURE 8.

Competition between strong and weak attractants studies in vivo by capillary chemotaxis assays. The responses of P. putida KT2440 to malate and succinate were tested in the presence and absence of the competing attractant citrate (10 mm), which was added to the cell suspension and the capillary. The data were corrected for background accumulation in capillaries containing buffer or buffer plus citrate (∼38 ± 11 cells for experiments without citrate and ∼20 ± 3 cells for experiments with citrate). The results are averages of at least four capillaries and error bars indicate standard errors.