Lab 6 - From the growth graphs it can be determined that...

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Heather Oslund M 2-5 BME 2.106 Oliver Lin 10-13-08 Lab 6: Bacterial Growth Purpose To observe the growth (by measuring absorbance and titer through dilution plating) of an organism with and without the presence of different types of antibiotics. Procedure We will be using a culture in late ‘lag’ phase not late ‘log’ as was stated in the materials and procedure. Instead of penicillin, the antibiotic carbenicillin was used. Discussion
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Unformatted text preview: From the growth graphs it can be determined that both antibiotics are bactericidal (since their titer curves left log phase sooner than that of the normal curve and thereafter declined) and that the carbenicillin is also bacteriolytic (since the absorbance also decreased with time). Since the cloramphenicol caused the decline in titer but not in absorbance it can be concluded that it is bacteriostatic....
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