The device, described in a paper published in Analytical Chemistry, contains six channels branching off from a central groove, where food samples are placed. As the device spins, the fluid is forced outward, traveling through small channels. Any bacteria is first concentrated on beads, which are coated with antibodies that bind to Salmonella. Cells are then broken apart with a laser, and DNA is amplified using primer specific to the bacteria. Then, C&EN explains: