Viral decay.

<p>Temporal development of viral abundance within incubations to determine viral particle decay in groundwater in (A) July, (B) August, (C) October, and (D) in surface water of the Danube River in November. Error bars show the standard deviation of triplicate incubations in groundwater in July, August, and October (A−D); error bars for data from surface water in November (D) depict the range of duplicate incubations. Data were fitted to the logistic function <i>y = a × b</i><sup><i>x</i></sup>, where <i>y</i> stands for viral abundance, <i>a</i> represents the <i>y</i>-axis offset, <i>b</i> is the decay coefficient and <i>x</i> represents time. Additionally, dashed lines represent 95% confidence limits for the fitted data as detailed in (<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0306346#pone.0306346.s006" target="_blank">S1 Table</a>).</p> <p>(PDF)</p>