FIG. 2.

Overview of the flotation setup. This setup is used to recover viable and VNC cells with buoyant densities of 1.065 and 1.109 g/ml. The Campylobacter recovery location is at the upper interface. The buoyant densities of the different colloidal solutions used in the two setups are shown. *, the density of the lowest layer may vary slightly because it consists of sample mixed with colloidal silica solution. Since the density of the sample may vary, this can impact the final buoyant density of this layer.