Chapter 5 1. a. How is preservation different from pasteurization? b. How or why

Question

Chapter 5 1. a. How is preservation different from pasteurization? b. How or why does a high concentration of sugar function as a preservative? Why do critical instruments need to be sterile, whereas semicritical instruments need only be free of viruses and vegetative bacteria? 2. 3. Would it be safe to say that if all bacterial endospores had been killed, then all other medically 4. How do autoclaving get water to boil above the normal boiling temperature of 100 C? 5. List the seven factors to consider when selecting a germicidal chemical. 6. a. Which types of radiation are ionizing and reliably used to sterilize materials, including objects important microorganisms had also been killed? Yes or No. Explain your answer. that are already packaged? b. What type of radiation is not a reliable sterilizing physical method? c. List two physical techniques you would use to sterilize heat-sensitive liquids (i.e., liquids that would be destroyed by heat)? 7. If a spoon has 500,000 of a certain microbe on its surface and you treat it with a germicide that has a D value of 10 minutes, it will take calculations minutes to sterilize the spoon. You must show your 8. If a bacterial cell has a generation time of 20 minutes, and you start with 100 cells, how many cells will there be in two hour? You must show your calculations

Explanation / Answer

1a)Pasteurization is a process in which liquids and food are heated at a specific temperature to slow down or decrease microbial growth in food.While preservation is a process which inhibits growth of micro-organisms in food.

b)High concentration of sugar causes bacteria to lose water by osmosis.Without water bacteria can't grow or divide.

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