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Aggregation of Escherichia coli (strain 25922) cell in the presence of condensed tannins (CT) of purple prairie clover (PPC; Dalea purpurea Vent.) and sainfoin (SF; Onobrychis viciifolia). a and b, bacterial suspensions prepared from culture pre-incubated with 0 and 10 µg/mL of PPC CT for 10 h; c and d, bacterial suspensions added with 50 and 200 µg/mL of PPC CT; e and f, bacterial suspensions added with 50 and 200 µg/mL of SF CT.
