Results
After testing the absorbance of Control and Treatment with Penicillin and Streptomycin cultures over a 160-minute time period, three phenomena for the three different cultures were recorded and made into the graphs below.
An upward trend of the absorbance in the Control culture as time progresses can be observed. Compared to the upward sloping absorbance curve of Control Treatment, both absorbance curves of Penicillin Treatment and Streptomycin Treatment have different directions of trends after 80 minutes the treatments were added. For the culture with Penicillin treatment, before the treatment was added, the absorbance increases at a steady rate until 80 minutes; it started and kept decreasing after 80 minutes, which is the time Penicillin was added. For the culture with Streptomycin treatment, the trend shows that absorbance increases at a steady speed prior to 80 minutes, but after the 80 minutes, which is the time the Streptomycin was added, the rate of absorbance increases at a decreasing rate.
Conclusion …show more content…
For Penicillin, the absorbance of the culture after Penicillin treatment was added decreased compared to that of the Control culture. In other words, the E.coli bacteria in the culture with Penicillin treatment were killed by the Penicillin. Therefore, Penicillin has the effect of sterilizing the bacteria.
For Streptomycin, the absorbance of the culture after Streptomycin was added increased at a much slower rate than that of the Control culture. It can be concluded that Streptomycin has the effect of inhibiting the growth of E.coli
After testing the absorbance of Control and Treatment with Penicillin and Streptomycin cultures over a 160-minute time period, three phenomena for the three different cultures were recorded and made into the graphs below.
An upward trend of the absorbance in the Control culture as time progresses can be observed. Compared to the upward sloping absorbance curve of Control Treatment, both absorbance curves of Penicillin Treatment and Streptomycin Treatment have different directions of trends after 80 minutes the treatments were added. For the culture with Penicillin treatment, before the treatment was added, the absorbance increases at a steady rate until 80 minutes; it started and kept decreasing after 80 minutes, which is the time Penicillin was added. For the culture with Streptomycin treatment, the trend shows that absorbance increases at a steady speed prior to 80 minutes, but after the 80 minutes, which is the time the Streptomycin was added, the rate of absorbance increases at a decreasing rate.
Conclusion …show more content…
For Penicillin, the absorbance of the culture after Penicillin treatment was added decreased compared to that of the Control culture. In other words, the E.coli bacteria in the culture with Penicillin treatment were killed by the Penicillin. Therefore, Penicillin has the effect of sterilizing the bacteria.
For Streptomycin, the absorbance of the culture after Streptomycin was added increased at a much slower rate than that of the Control culture. It can be concluded that Streptomycin has the effect of inhibiting the growth of E.coli