SUMMARY: Diaminopimelic acid decarboxylase was found to be widely distributed among 58 coli-aerogenes organisms. Different strains grown and tested under standard conditions showed great variations in enzyme activity although the amount of diaminopimelic acid in the cell hydrolysates was similar. Except for a higher average activity in , there was no correlation between the activity of diaminopimelic acid decarboxylase and the biochemical type of coliform organism. No strain was found that contained diaminopimelic acid decarboxylase in the absence of lysine decarboxylase. The enzyme was also found in a strain of but not in or


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