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Course: Microbiology
Level: Undergraduate
Question:
Write an introduction. Hamburger bacterial samples were removed from the refrigerator at different times and placed at room temperature. What will happen? Did they have enough nutrients that there were no limitations? What do you expect to happen and why were the conditions such that it would happen?
Answer:
If food is left un-refrigerated, bacteria cells will grow and more heat will be required to kill the additional cells. In this case, at first, more bacteria grow on the samples which have been at room temperature longer than the others. However, after some time, the bacteria reach optimum quantity and after that, due to limitations of nutrients, they die out. This means that the number of bacteria in the samples decreases. However, the thermal properties of foodstuffs can vary extensively when different samples are compared, which in turn has a pronounced effect on temperature profiles within foods. The fat contained in vacuum-packed hamburgers provides a significant protective effect for lactic acid bacteria when the hamburgers are exposed to heat.
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