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Lab Report Bacteria

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Submitted By lalala2611
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Bacteria can be found in plants and animals, in all habitats, on all surfaces and even in our bodies. To investigate the type bacteria existing in different locations, we took a culture from the inside of a mouth and the surface of a tabletop and let the bacteria grow in agar plates for one week. Separate agar plates were prepared for each of the two locations that also contained a small amount of two different cleaning solutions, Lysol and Green disinfectants, to observe which product worked better at killing bacteria. Both agar plates contained white and yellow bacteria growths. The bacteria in the agar plates was not evenly distributed throughout the surface, but rather was clustered in small areas. This was most like due to uneven distribution of the sample. It could also be attributed to the fact that bacteria grow in colonies. The plates with cultures from site 1 had slightly less bacteria coverage than the coverage from site 2. Although, this was really only the case for one of the cultures from site 2 while the other culture from the same site grew the same amount as the two cultures from site 1.
It was observed that no bacteria grew on the portion of the agar nutrient where cleaning product was applied. It should be noted that the very minimal amount of bacteria that grew in the agar nutrient made it difficult to determine if this result was due to the effectiveness of the disinfectants. For this reason as well it is unclear which cleaning product out preformed the other in prevent bacterial growth.
Hypothesis 1 was rejected due to the minimal amount of bacterial growth, although bacteria could have existed that could not be seen with the naked eye. Hypothesis 2 was also rejected because there was not enough bacterial growth to observe whether or not Lysol was a more affective disinfectant than the green disinfectant.
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