Table 1. Comparison of fermentation parameters of different strains.

Strains	Solvent yield	Butanol yield	Butanol/ethanol ratio
C. acetobutylicum DSM 1731	29.1%	18.2%	6.65:1
C. acetobutylicum DSM 1731 adhE2::int(846)	31.8%	20.3%	8.15:1
C. acetobutylicum DSM 1731 bdhA::int(133)	31.5%	19.0%	5.63:1
C. acetobutylicum DSM 1731 SMB_P058::int(150)	28.8%	19.2%	10.12:1
C. acetobutylicum DSM 1731 yqhD::int(405)	29.9%	19.6%	10.17:1