What Are Perturbations and How Do They Affect Cellular Aging Models?

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zezima1
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Long story short:
I'm writing a project om modelling cellular aging in biological tissue from the principle that cells have to stay alive as long as possible without help from stem cells (biophysics).

Now the model of the amount of cells fluctuates around a steady state until stochastic fluctuations make it decline rapidly.

To describe this (I think) my article introduces something called pertubations. What are they, would it be possible that they were used to describe stochastic behaviour, and does anyone know a good link to read about them? :)
 
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