Fig. 1

Physicochemical characteristics of M. guilliermondii GXDK6. a Colony characteristics; b Morphology of GXDK6 as observed under a scanning electron microscope; c The relative biomass of GXDK6 in the pH range of 2.5–10.0; d The relative biomass of GXDK6 under gradually increasing salt concentration; e The relative biomass of GXDK6 under different heavy metals; f The relative biomass of GXDK6 in the temperature range of 25–50 °C