Lab 4 Report - John Malloy BMZ115EK Tzvia Cuperman October...

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John Malloy BMZ115EK – Tzvia Cuperman October 18, 2010
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2 Hypothesis: Through serial dilution and gram staining, one can determine what bacteria are present in a solution, which of those bacteria are infectious, and how to kill the infectious bacteria. Written Results: Each of the five attached tables gives the data of a specific water sample. Within each table, there is a section that takes note of the important characteristics of the bacteria after plating, and a section that takes not of the important characteristics of the bacteria after performing a gram stain. Table 1 represents the data collected for Pond 16, which was the ‘clean’ sample. It showed no traces of bacteria after plating, and performing a gram stain revealed no more information. Table 2, which represents the data collected for Pond 22, the ‘contaminated’ pond, is a bit more insightful. After plating the solution, there was a total of 26 bacterial colonies on the agar plate. Of those 26 colonies, three were white, 11 were red, and 12 were pink. After performing a gram stain, the bacteria appeared to be pink and coccus shaped. Tables 3 and 4 represent the data collected for the ampicillin and collistin samples respectively. After plating both of these water samples, neither showed any sign of bacteria and the tables were left blank. Table 5, however, contains useful data. It completely mimics the data collected from Pond 22 (Table 2). There were 26 bacterial colonies with three of them being white, 11
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Lab 4 Report - John Malloy BMZ115EK Tzvia Cuperman October...

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