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NEWTON Home Page NEWTON Teachers Visit Our Archives Ask A Question How To Ask A Question Question of the Week Our Expert Scientists Volunteer at NEWTON! Frequently Asked Questions Referencing NEWTON About NEWTON About Ask A Scientist Education At Argonne Bacteria and Moisture Differences 
Name: Sarah
Status: Student
Grade:  6-8
Location: OH
Country: United States
Date: January 2009
Question:
How do moisture levels affect bacterial growth?


Replies:
Bacteria need a certain moisture level to grow. Some bacteria can surive dry conditions by forming what is known as a spore and can germinate once the moisture conditions they need are re-established. This is why in the past, before refrigeration, some foods were preserved by drying them, ie. beef jerky, prunes (dried plums), etc. Also, as long as foods like cereal are kept dry, they don't spoil. They may taste stale, though.

vanhoeck


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