Which microbial control method is most effective for killing a population of Bacteria X?

A microbial control method with a D-value of 10 minutes.

Which microbial control method is most effective for killing a population of Bacteria X?

Alright, everyone. Here we have our next practice problem. Which microbial control method is most effective for killing population of bacteria X? Okay. So we are given different d values in our answer choices here. Remember that the d value is the decimal reduction time for the microbial death curve of whatever microorganism you happen to be trying to control. And in this case, that's bacteria x. Now what does the d value tell us? Remember that the d value tells us the amount of time it takes for 90% of the microbial population to die off with the use of a particular control method. Now if you have bacteria x and you use different control methods, they will have different d values because some will be more effective than others so they'll kill off the population faster so they'll have a smaller d value than other ones which will have a larger d value because they'll kill the population slower. But we are being asked which is the most effective. So that means which is killing this population of bacteria X at the fastest most effective rate? Well, that should be the population or the control method, excuse me, with the smallest d value because it has the smallest amount of time that it takes to kill 90% of the population. So if we have a look at our answer choices here, answer choice b has a d value of 10 minutes, where all the other d values are larger. So whatever control method is being used in answer choice is the most effective. So the correct answer here is answer choice Keep in mind that a smaller d value means that the population is dying at a quicker rate, so that control method is more effective. If you have a larger d value, that population is dying at a slower rate, so that control method is less effective. Okay, everyone. Let's move on to our next video.