TABLE 3.

Substrate spectra of strains MEA3-1 and MEA3-1Mut

Substrate	Result witha:
	MEA3-1	MEA3-1Mut
MEA	+	*
DEA	+	*
DMA	+	*
Aniline	−	−
2,3-DMA	−	−
2,4-DMA	−	−
2-MA	+	*
4-OH-DMA	+	−
DMHQ	+	−
Toluene	−	−
O-Xylene	−	−
Phenol	+	+
Catechol	+	+
Hydroxyquinol	+	+
Hydroquinone	+	+
2-MP	+	*
2,6-DMP	+	*
3,5-DMP	+	*
3,4-DMP	−	−

^a+, positive for strain growth and substrates were degraded; −, negative for strain growth and substrates were not degraded; *, negative for strain growth and substrates were transformed to other compounds. The biomass was measured at 600 nm (OD₆₀₀) using a Shimadzu UV-visible spectrophotometer. The mineralization or cometabolic transformation of these aromatic compounds was measured using HPLC, all treatments were performed in triplicate, and control experiments without inoculation and without substrate were performed under the same conditions.