Bifidobacterium is important inhabitant in intestinal tracts of people and animals. It has beneficial effects on intestinal health. But its functional mechanisms are not clear. Physiological function, functional mechanisms of Bifidobacterium and its applications in foods were investigated systematically by seven experiments in vitro and in vivo. They were composed of isolation and determination of Bifidobacterium, comparison of growth characteristics, factors influencing survivability, bioantagan...