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United States Department of Agriculture

Agricultural Research Service

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Image Number K10594-1

Microbiologist Patricia Millner and research assistant David Ingram examine bacterial colonies on nutrient media to detect and count various pathogens in manure samples before composting. Similar examinations are later conducted on finished compost to ensure that pathogens have been killed.

Photo by Stephen Ausmus.

640 pixels wide: (k10594-1.jpg)

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Last Modified: 3/14/2017
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