Acinetobacter baumannii 1 Article 1 Berberine 1 Bifidobacterium longum 1 Biotransformation 1 CYP51 Demethylated metabolite 1 Enterococcus faecalis 1 Enterococcus faecium 1 Escherichia coli 1 Gut microbiota 1 Institute for Cancer Research mouse 1 Klebsiella pneumoniae 1 Proteus mirabilis 1 Pseudomonas aeruginosa 1 RNA 16S 1 Staphylococcus aureus 1 Staphylococcus epidermidis 1 animal experiment 1 area under the curve 1 bacterial strain 1 bacterium culture 1 berberine 1 beroline 1 comparative study 1 controlled study 1 crystal structure 1 demethylation 1 drug half life 1 drug metabolism 1