Copper and dyes enhance laccase production in γ-proteobacterium JB

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Laccase production in γ-proteobacterium JB was enhanced 13-fold by adding 0.1 mm CuSO4 24 h after the onset of growth. Ethidium bromide (2.5 μm), Malachite Green, Phenol Red and Thymol Blue (10 μm each) enhanced laccase production 17-, 19-, 4- and 2-fold, respectively. Among the fourteen aromatic/organic compounds tried, p-aminobenzoic acid and an industrial effluent, from where the organism was isolated, showed 1.2- and 1.26-fold increases in production.

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