Slackia isoflavoniconvertens Matthies et al. 2009 Matthies A. Blaut M. Braune A. Isolation of a human intestinal bacterium capable of daidzein and genistein conversion 2009 75 1740 1744 Applied and Environmental Microbiology Appl Environ Microbiol 0099-2240 1098-5336 10.1128/AEM.01795-08