3.5 µg/L Ag⁺ has little to no effect on late stages of batch culture growth.

<p>3.5 µg/L Ag⁺ in the form of AgNO₃ was introduced to batch cultures in the same way as described in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0074456#pone-0074456-g001" target="_blank">Figure 1</a>. This concentration caused initial toxicity to cultures in fast growth phase, but these cultures were able to recover to the level of the control cultures in fast growth phase. This concentration had no visible effect on cultures in slowing and stationary growth phases. The data points are averages from three replicate cultures and the error bars reflect their standard error. The lines just connect the data points and help differentiate between culture in fast (solid), slowing (large dashes), and stationary (short dashes) growth phases.