Observed overall biomass

Treatment	Observed Y_X/S(g-biomass produced/g-substrate consumed)
1	n.a.*
2	0.238^a
3	0.448^a
4	0.509^b
5	0.417^a
6	0.177^a

Table 2: Observed overall biomass yields from the fed-batch runs: *Not calculated since there are three acids and stationary phase was quickly reached; aData from 24hour to 120h period; bData from 36hour to 108h period.