ID#: 11999
This photograph depicted a QUAD Plate containing a xanthine growth media, upon which Gram-positive, Nocardia, and Streptomyces bacterial colonies were grown. The results here, were two positive, i.e., the ability for the organisms to decompose xanthine, and two negative growth patterns. Positive results included a clear halo around the colonies, while a negative result manifests as an absence of this clear halo, and instead, one will note the deposition of a melanin-like pigment. These colonies were grown in an aerobic environment, which means these organisms thrive in the presence of oxygen.
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Content Provider(s): CDC/ Dr. David Berd
Creation Date: 1972
Photo Credit:
CDC Organization
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Copyright Restrictions: None - This image is in the public domain and thus free of any copyright restrictions.