Ratio of total DNA extracted either from retentate or filtrate.

<p>Ratio of total DNA extracted either from PES membrane filter (retentate) – (•) or concentrated with ultrafiltration (filtrate) – (▴), after bacterial spiking of agarose followed by enzymatic hydrolysis in relation to the sum of DNA extracted from each individual sample (abbreviated as total extracted DNA mass). The sum of the • and ▴ percentages in each vertical line is 100%, which is represented on the total extracted DNA mass axis. Black lines represent linear trend: filtrate (R² = 0.331, slope coefficient −0.03 and intercept 89.7) and retentate (R² = 0.331, slope coefficient 0.03 and intercept 10.3). 95% confidence intervals for both fitted lines are presented with grey area.