Fig. 1.

In vitro culture of B. subtilis SCK6 and BsS-RS06550. a BA production of SCK6 and BsS-RS06550. b Growth curves of B. subtilis SCK6 and BsS-RS06550 at OD₆₀₀. Growth curve parameters, k is the maximum possible population size in particular environment or the carrying capacity; r is the intrinsic growth rate of the population and t-gen is doubling time or generation time of a population. c SCFAs production in microbial community co-culture with SCK6 and BsS-RS06550, respectively, including acetic acid (AA), propanoic acid (PA), and butyric acid (BA). Data are represented as mean ± SD, n = 5 repeats for (a, c). *p value < 0.05, **p < 0.01 and ***p < 0.001