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Variation of electrophoretic mobility as a function of pH for L. helveticus ATCC 12046 (circles) and L. lactis subsp. lactis bv. diacetilactis LMG 9452 (squares) cells harvested in the exponential (open symbols) and stationary (closed symbols) growth phases. Measurements were made in 1 mM KNO3 solution on two independent sets of data; the bars represent 95% confidence intervals.
