. The yields of butyrate
reported here are similar to the levels previously obtained in
E. coli, 9.670 versus 7.2 g l21 in prior studies (Baek et al.,
2013). The highest levels of hexanoate produced here were
about 10-fold higher than prior studies, 1.963 versus about
0.180 g l21 (Machado et al., 2012). The highest amount
of octanoate measured here was 0.216 g l21 but in prior
studies octanoate levels were not reported. Thus, the system
reported here provides a reasonable basis for the production
of even-chain FAs in E. coli including some longer-chain
molecules.