T e a c h e r  C r e a t e d  L e s s o n

Microorganisms in a Macro World (part 3)

mbeall

CHIN, Gatineau, Quebec

4. Dehydratation

  • Hot
Applying heat to food evaporates the water it contains; this inhibits the growth of microorganisms but does not, however, kill them.
  • Cold
The food is first frozen, then a powerful vacuum is applied so that the ice is converted directly to water vapor. This leaves the food and the microorganisms dehydrated. Contrary to dehydration using heat, this process does not alter the shape or the properties of the food that can thus be reconstituted.

Armand-Frappier Museum


© Armand-Frappier Museum, 2008. All rights reserved.
Learning Object Collection: Zoom in on Microorganisms
Learning Object: Our defenses against germs
Institution: RCIP-CHIN