Bacterial cultures. Stock c ultures of S. aureus and E. coli were maintained on tryptic soy agar . Prior to each experiment,
a test tube containing 10 mL sterile tryptic soy broth was inoculated with S. aureus or E. coli , placed in a Lab - Line incubator -shaker , and incubated at 100 rpm and 37 for 14 hours. Fixation and Staining of Bacteria. F