Busy. Please wait.

show password
Forgot Password?

Don't have an account?  Sign up 

Username is available taken
show password


Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account.
We do not share your email address with others. It is only used to allow you to reset your password. For details read our Privacy Policy and Terms of Service.

Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.
Didn't know it?
click below
Knew it?
click below
Don't know
Remaining cards (0)
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

  Normal Size     Small Size show me how

FoodMicroLecture 21

Final Exam

Describe the hurdle concept. One preservative isn't enough for all microbial safety and stability.
T or F: Growth, survival, and inactivation of microorganisms in foods are not reproducable responses. False
A _____ model can quantitatively describe the combined effect of environmental parameters. mathematical
What are two types of tests used in predictive microbiology? Challenge testing, storage trials.
Define a primary model. Describe changes in microbial numbers with type (eg. D-value).
Define a secondary model. Describe how parameters in a primary model change with different environmental parameters (eg. Z-value).
Define a tertiary model. Describe secondary models with user-friendly interface for non-modelers.
What is the flow from data generation to modeling? Data generation, primary modeling, secondary modeling, product validation, tertiary modeling.
Define thermal death time. The time necessary to kill a given number of microorganisms at a specified temperature.
T or F: Thermal death is first order process. True
Microbial death rate due to heat can be expressed as a function of____ and ____ under a given condition. time, temperature
T or F: Rate of cell death is directly dependent on the number of viable cells present at a given lethal temperature. True
Define decimal reduction time (D-value). Time at a given temperature for a microbial population to be reduced by 1-log.
Define Z-value. Temperature change which results in a 1-log change in D-value; calculated from log-D versus temperature.
How would the thermal death curve appear if the population contained a mix of species? Tailing would be observed.
Created by: goberoi



Use these flashcards to help memorize information. Look at the large card and try to recall what is on the other side. Then click the card to flip it. If you knew the answer, click the green Know box. Otherwise, click the red Don't know box.

When you've placed seven or more cards in the Don't know box, click "retry" to try those cards again.

If you've accidentally put the card in the wrong box, just click on the card to take it out of the box.

You can also use your keyboard to move the cards as follows:

If you are logged in to your account, this website will remember which cards you know and don't know so that they are in the same box the next time you log in.

When you need a break, try one of the other activities listed below the flashcards like Matching, Snowman, or Hungry Bug. Although it may feel like you're playing a game, your brain is still making more connections with the information to help you out.

To see how well you know the information, try the Quiz or Test activity.

Pass complete!

"Know" box contains:
Time elapsed:
restart all cards