Abstract Background Chemical-in-plug assays are commonly used to study bacterial chemotaxis. sometimes in the absence of stringent controls. Results We report that non-chemotactic and non-motile mutants in two distinct bacterial species (Shewanella oneidensis and Helicobacter pylori) show apparent zones of accumulation or clearing around test plugs containing potential attractants or ... https://pipingrockers.shop/product-category/colloidal-silver/