SUMMARY: Escherichia coli isolates grew poorly in a phosphate-deficient medium. The presence of inorganic phosphate repressed the formation of alkaline phos-phatase enzyme but did not affect the formation of acid phosphatase enzyme. Twenty-two non-enteropathogenic Escherichia coli isolates exhibited 16 esterase isoenzyme patterns while 15 enteropathogenic isolates exhibited three patterns. No relationship was found between enteropathogenicity and acid or alkaline phosphatase isoenzyme patterns.
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Stewart et al. (1971) studied this question.
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