Image Number D1173-1
Two antimicrobial edible film disks (the top two in the petri dish) repel E. coli O157:H7 growth in the agar surrounding them. Roberto Avena-Bustillos, a collaborating researcher from the University of California-Davis, uses a micrometer to measure the width of the clear agar zone around one of the two disks. The bottom two disks are controls.
Photo by Peggy Greb.