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Asked Feb 16, 2020
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When you inspect the environmental plates, you will probably notice that there is more growth from a sample taken from a moist area than from a dry area. Why?

 

 

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The growth of microbes requires a certain level of water activity. It is described as the amount of water available for the microbes to perform its metabolic activities. Most microbes require a moist habitat having water activity of 0.98 or higher to grow and proliferate. The structure of DNA (deoxyribonucleic acid) is disordered at water activity below 0.55. Some xerophilic organisms like yeast, fungi, and Staphylococcus aureus can grow in drier environments. This property of microbes is utilized to prevent spoilage of food. ...

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