ID#: 15330
Description: Caption:
This image depicts five Petri dish culture plates that had been filled with an agar based medium of yeast extract, cysteine, and ferric pyrophosphate, to which high concentrations of D- or L-tyrosine, or D- or L-phenylalanine had been added. These plates had been inoculated with cultures of various strains of Legionella pneumophila. Note that browning of the medium had occurred, when L. pneumophila had been grown in the presence of high concentrations of L-tyrosine, and to a certain extent, L-phenylalanine, but no browning when the D-isomers were included in the mixture. Note PHIL 2135, 2136, 15259, 15329, 15331, and 15760, for other views of this nutrient-dependent phenomenon.
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Content Providers(s): CDC/ Dr. Kamile Rasheed
Creation Date: 1978
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Copyright Restrictions: None - This image is in the public domain and thus free of any copyright restrictions.