Fig. 6

A mixed culture of labeled B. subtilis and P. aeruginosa can be sorted, by their preferred chemoattractants placed in the sink wells of a microfluidic system. a B. subtilis and P. aeruginosa were labeled with their corresponding probe complexes and placed in the well called the “original microbial pool.” b the original microbial pool, and nitrate and Fe chemoattractants were placed in source and sink wells, respectively. c  P. aeruginosa migrated to the nitrate rich sink-well while d B. subtilis migrated toward Fe²⁺ rich sink-well. The source and sink wells are monitored by fluorescent microscopy