Figure 4.

Chromatographic profiles of volatiles released on d 2 from B. subtilis parental strain 168 (A), an overexpresser line BSIP1171 (B), mutant lines BSIP1173 (C) and BSIP1174 (D), and uninoculated media (E). Compounds positively identified include 3-hydroxy-2-butanone (1), 2,3-butanediol (2), decanal (3), decane (4), tetramethyl pyrazine (5), and undecane (6); nonyl acetate was added as an internal standard (IS). Asterisks in the lower chromatograms designate compounds that align with numbered peaks above.