METHODS OF MEASURING BACTERICIDAL ACTIVITY 77 



TABLE 10. ANTILUMINESCENT AND ANTIBACTERIAL ACTIVITIES 

 OF VARIOUS ANTIBIOTIC SUBSTANCES 



From Rake, Jones, and McKee (716). 



* Streptococcus pyogenes used as test organism. 



t A tyrothricin-Iike preparation. 



METHODS OF MEASURING BACTERICIDAL 

 ACTION OF ANTIBIOTIC SUBSTANCES 



Several methods are commonly employed for measuring bactericidal 

 action of antibiotic substances. A suspension of washed bacterial cells in 

 saline or other suitable solution, or a 5-to-i2-hour-old broth culture of 

 the test organism, is treated with various dilutions or concentrations of 



