The presence and growth of bacteria in food products causes a need for a âbest before dateâ of some products (such as milk) so that shoppers will buy the product and consume it before the number of bacteria grows too large and the product goes bad. When milk is stored in a fridge at 4oC, the average growth rate of the bacteria is 0.00019 cells/minute. Assuming an initial bacterial load of 500 cells and a critical threshold of 56570 cells, for how many days can the milk be stored and consumed before it goes bad? 9. At room temperature, the generation time of bacteria in milk is about 10 times shorter than that at 4oC. Given this information, for how many days can the milk be stored at room temperature before it goes bad? 10.Five E. coli cells are introduced in a medium containing 2 carbon sources; glucose and lactose. The generation times with glucose and lactose are 15 and 20 minutes, respectively. Initially, only glucose is used as a carbon source until it is exhausted after one hour of growth. How many cells would you have after 3 hours of growth?
The presence and growth of bacteria in food products causes a need for a âbest before dateâ of some products (such as milk) so that shoppers will buy the product and consume it before the number of bacteria grows too large and the product goes bad. When milk is stored in a fridge at 4oC, the average growth rate of the bacteria is 0.00019 cells/minute. Assuming an initial bacterial load of 500 cells and a critical threshold of 56570 cells, for how many days can the milk be stored and consumed before it goes bad? 9. At room temperature, the generation time of bacteria in milk is about 10 times shorter than that at 4oC. Given this information, for how many days can the milk be stored at room temperature before it goes bad? 10.Five E. coli cells are introduced in a medium containing 2 carbon sources; glucose and lactose. The generation times with glucose and lactose are 15 and 20 minutes, respectively. Initially, only glucose is used as a carbon source until it is exhausted after one hour of growth. How many cells would you have after 3 hours of growth?
