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Departments of Biochemistry and Nutrition and of Biology, Virginia Polytechnic Institute, Blacksburg1
A mutant strain of Escherichia coli, known to require threonine, methionine and leucine, was examined with regard to nitrogen balance between cells and medium under conditions of nitrogen starvation and nitrogen-excess and of energy (glucose) starvation and excess. Each of the three amino acids studied was metabolized in a characteristic manner.
Manuscript received 25 September 1959.