Fig. 6
Extracellular β-mannanase activity of the recombinant B. subtilis WB600-8 cultured in 50 ml of various modified 2 × SR mediums. a Different nitrogen sources with 3% concentration in 2 × SR medium; b different proportions substitution of yeast extract (YE) by glucose (G) in the modified 2 × SR medium with 3% peanut meal as nitrogen source; c different peanut concentration in the modified 2 × SR medium with 3% yeast extract and 2% glucose; d different doses of inoculation in the final modified medium containing 5% peanut meal, 3% yeast extract, 2% glucose and 0.6% K2HPO4. Error bars represent standard deviations