Quantification of biovolume.

<p>(a) Total biovolume and (b) relative biovolume of the four-species biofilms, including the bacterial species <i>S</i>. <i>oralis</i>, <i>A</i>. <i>naeslundii</i>, <i>V</i>. <i>dispar</i> and <i>P</i>. <i>gingivalis</i>. Each bar shows the mean ± standard error from three different wells of one biofilm growth experiment of the three biological replicates measured after 24 and 48 hours.