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Computer-analyzed tracking motility patterns. (A) No acid, motile SS1 bacteria swim in linear fashion and do not display arcing patterns; (B) 0.1 N HCl, motile SS1 bacteria swim in a series of arcs that move each bacterium from left to right over a period of 30 s. Multiple trackings under each condition yielded similar results (summarized in Table 2): no arcing and random swimming patterns (no acid) and arcing tactic patterns in response to acid.
