ID#: 27633
Caption:
This photograph depicts a close view of two slant culture tubes, each containing Difco Casitone agar supplemented with starch. The cultures were used to help identify unidentified Actinomyces species by biochemical testing. Tube A was inoculated with strain A-13-R, and Tube B with strain A-13-S. Following incubation, Gram's iodine solution was added to each tube. Tubes retaining starch, indicating an inability to hydrolyze starch, stained dark purple. The organisms in Tube A were unable to hydrolyze starch (hydrolysis negative), while those in Tube B were able to hydrolyze starch (hydrolysis positive).
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Content Provider(s): CDC/ Dr. Lucille K. Georg
Creation Date: 1962
Photo Credit: John P. Gust, Jr.
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Copyright Restrictions: Permission is not required for public domain images, however, these images are provided by CDC and are available for personal, professional, and educational use with appropriate attribution. Redistribution must credit CDC and, where known, the individual photographer, and identify the CDC website as the free source. For additional terms see Use of Agency Materials | Other | CDC