Quantification of stress responses

7 important questions on Quantification of stress responses

What are the steps you need to take in a quantification procedure?

  • Data collection
  • Model selection
  • Quantification of effects

What can we say about the effect of salt on B. cereus?

Salt makes the bacillus cereus stronger.

What can you say about the different strains?

There is a difference in heat resistance between strains.
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What can you say about the form of the inactivation?

The inactivation has to fractions. One fraction is extremely heat resistant, these are the spores. The other fraction is inactivated easily, these are the vegetative cells.

What are the selection criteria for a model?

  • Model can be fitted to all conditions
  • Biological meaning of the parameters (CFU, reconcilable parameters)
  • Model is flexible: reduction of model parameters (model should fit all different conditions)

What are the things that have to be taken into account for the model of the 2 b cereus strains?

  1. The model has to take into account that there are 2 strains, the sensitive vegatitive cells and the resistant vegatative cells for the ATCC14579 and the sensitive vegatative cells and resistant spores fore the ATCC10987 strain.
  2. Effect of salt addaptation on resistance
  3. The shoulder that is present in some of the slat ATCC14579

What do the things in this model stand for?
N(t), N(0), k(sens), k(res), t, f, t(s)

N(t): Concentration at a certain point of time
N(0): Initial concentration
k(sens): inactivation rate sensitive micro organism
k(res): Inactivation rate more resistant micro organism
t: time
f: fraction resistant cells.
t(s): holder period

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