TABLE 4.

Intracellular alanine concentrations

Strain	Carbon source	Alanine concna (mM)
3841	Glc-NH3	11.9 ± 0.7
	Succ-NH3	6.6 ± 1.1
RU1327	Glc-NH3	7.8 ± 0.8
	Succ-NH3	1.9 ± 0.6
RU1552	Glc-NH3	33.1 ± 4.2
	Succ-NH3	7.4 ± 1.3

^aValues are the means ± SEMs. All samples are averaged from at least three independent cultures. For 3841, RU1327, and RU1552, alanine concentrations are higher in glucose-grown cultures than in succinate-grown cultures (P < 0.01). Alanine concentrations are higher in strain 3841 than in RU1327 for both glucose- and succinate-grown cultures (P < 0.05) and are higher in RU1552 than in 3841 when cells are grown on glucose but not when they are grown on succinate at (P < 0.01).