9.3: Results - Biology

9.3: Results - Biology

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A. The Microbiology of Milk

Record the results of your experiment in the table below. Describe any notable growth characteristics.

TSA Plates

Amount of GrowthGrowth Characteristics
Regular pasteurized (refrigerated)
Regular pasteurized (room temperature)
UHT pasteurized (refrigerated)
UHT pasteurized (room temperature)

Which type of milk had the largest number of bacteria? ___________________________________

Was your earlier prediction correct? ______________

B. The Microbiology of Poultry

Count the CFUs on your plates. Record your numbers in the table below. If there are too many CFUs to count, just write “TMTC” (too many to count). Remember—a countable plate that is considered statistically significant should have between 30 -300 CFUs.

Record your plate counts below. Make note of any notable growth characteristics (e.g., fungal-like growth, colony colors, etc.) Note: not all of your plates may be in the countable plate range (they may have many more or many fewer colonies). You need only record the numbers for the countable plates.

Based on the results for each countable dilution, determine the total number of bacteria in the original sample. Then average these numbers to obtain a more significant result.

Dilution platedAmount spread on plateGrowth characteristicsNumber of CFUs/plateNumber of bacteria/ml in original sample (No. CFUs x Dilution factor x 10)
Tube 2 =10-4 0.1 ml
Tube 3 = 10-5 0.1 ml
Tube 4 = 10-6 0.1 ml

Average number of bacteria/ml in original sample:

If you also did this experiment using EMB plates, would you expect more colonies on the TSA or the EMB plates? Explain your answer.

What type of bacteria could you identify by using the EMB plates, and why would these bacteria be of concern for human health?

Class Data

For the results of the experiment to be more statistically significant, data from the entire class will be collected and written in the following table.

Number of bacteria/ml in original sample
Table 1
Table 2
Table 3
Table 4

C. Microbiology of Food

Observe the plates of all of the food materials. Rate the food material based on the relative number of bacterial colonies seen on each plate:

least bacteria ___________________ < _____________________ < ___________________ < __________________ most bacteria

Biology PAG 9.3

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