ID#: 28966
Caption:
This photograph depicts a close frontal view of what is referred to as a CDC Lombard-Dowell (LD) Presumpto Plate II quadrant plate, and focused on quadrant 2 that had contained the LD agar supplemented with deoxyribonucleic acid (DNA), and the indicator toluidine blue, used to detect hydrolysis of the DNA. This quadrant was inoculated with an unidentified anaerobic bacterium. This test revealed a negative result, for no color change had taken place in the region of the bacterial growth. Therefore, no DNA hydrolysis had occurred. This means that the added organism was not able to produce the enzyme deoxyribonuclease (DNase), which facilitates DNA hydrolysis.
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Content Provider(s): CDC/ Dr. Gilda L. Jones
Creation Date: 1981
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