ID#: 15520
Caption:
The two test tubes depicted here, contained the differential growth medium known as nitrate broth, used in the biochemical identification of organisms that are capable of reducing nitrate to nitrite, or other nitrogenous compounds via the action of the enzyme nitratase, or nitrate reductase. Inside each of these tubes, was a smaller Durham fermentation tube, which had been inverted in order to catch, and sequester any gas, as a result of the reduction of nitrate into nitrogen gas. Note the production of nitrogen gas caught in the Durham tube on the right, but no gas produced in the tube on the left.
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Content Provider(s): CDC/ R. E. Weaver, MD, PhD
Creation Date: 1971
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