Figure 1.

Increments, with respect to time zero, on the levels (Log CFU/mL) of the strains when grown in mono-culture (Bifidobacterium dark-blue column and C. difficile dark-red) or co-culture (Bifidobacterium light-blue and C. difficile light-red column) in the prebiotics Synergy (Syn), Inulin (Inu), and Actilight (Act), in glucose (Glc) or without any carbon source added (WCS). Different capital letters above columns denote statistically significant differences (p < 0.05) among carbon sources in the mono-cultures of the corresponding bacterial strain, whereas different lowercase letters indicate differences in the co-cultures (either Bifidobacterium in blue letters or C. difficile in red letters). ^*Indicates statistically significant differences (p < 0.05) for the corresponding bacterial strain between mono- and co-culture within the same substrate.