TABLE 5.

Expression of a gudB-lacZ fusion in minimal medium^a

Carbon source	Nitrogen source	β-Galactosidase activity
Glucose	Ammonia	50
	Glutamine	102
	Glutamate	172
	Proline	183
	Ornithine	89
	Arginine	84
Proline	Proline	181
Ornithine	Ornithine	162
Arginine	Arginine	144

^aCells of strain BB1401 were grown in TSS medium. β-Galactosidase activity was assayed and expressed in Miller units as described in Materials and Methods. All numbers are averages of at least two experiments, and the mean errors did not exceed 20%.