| Bacteria, Aerobic (1 tracked article) |
| Bacteria, Anaerobic (1 tracked article) |
| Cyanobacteria (16 tracked articles) |
| Endospore-Forming Bacteria (57 tracked articles) |
| Firmicutes (109 tracked articles) |
| Fusobacteria (3 tracked articles) |
| Gram-Negative Bacteria (214 tracked articles) |
| Gram-Positive Bacteria (120 tracked articles) |
| Nitrogen-Fixing Bacteria (2 tracked articles) |
| Proteobacteria (84 tracked articles) |
| Spirochaetales (1 tracked article) |