16S RNA 1 Alloprevotella 1 Article 1 Bacteroides 1 Bacteroidetes 1 Bifidobacterium 1 Bilidobacterium 1 Blautia 1 Coprobacter DNA 1 DNA extraction 1 Diet 1 Enshi 1 Enterobacter 1 Escherichia 1 Faecalibacterium 1 Firmicutes 1 Gut microbiota 1 KEGG 1 Proteobacteria 1 Pyramidobacter 1 RNA 16S 1 Roseburia 1 Selenium 1 Shigella 1 aged 1 bactericide 1 bacterium 1 biofilm 1 controlled study 1