The Distribution of , -Diaminopimelic Acid among various Micro-organisms

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Abstract
A large number of microorganisms were hydrolyzed, and the hydrolyzed material subjected to electrodialysis which removed the basic and acidic substances. The remaining neutral fraction was treated with peroxide, and 2-dimensional chromatograms were run. The acid was widely distributed among bacteria, but could not be demonstrated in unrelated organisms. None was found in the Gram-positive cocci, nor in yeasts, plant viruses or protozoa. It is suggested that the occurrence of this acid may be considered a feature of bacterial classification.