Lab Report 7: Bacterial Motility, Hanging Drop Method PDF

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Lab Report 7 Name: __Michele Glantz__ Date: ___5/15/19_______

Bacterial Motility: Hanging Drop Method Your Results and Observations Record your results.

Organism Micrococcus luteus Pseudomonas aeruginosa

Describe what the moment looks like. A large number of cells moved back and forth a short distance Many of the cells did not move a short distance back and forth but a small amount of them moved a greater distance

True motility? (yes/no) No

Yes

Interpretation and Questions 1. What is the most important thing to look for to determine whether you are seeing true motility or Brownian movement? If you observe many cells not mobbing or moving a short distance and a few cells mobbing a significant distance, your interpretation is true motility. If you observe a large number of the cells moving back and forth a short distance, your interpretation is false motility due to Brownian movement.

2. Why is it hard to see the cells in a hanging drop slide (your own experience doing this exercise or information in the “Results and Interpretation” section might help here)? It is hard to see the cells in a hanging drop slide because they lack color, causing the bacteria in the drop to be difficult to focus on and observe.

Lab Report 7...