A VLAN tagging unit associated with a WAN is used to add VLAN tags based upon logical interfaces. 6 to less than 2 mole percent dipropylene glycol. In certain embodiments of the invention, the particles and test sample are combined together with a chemical compound selected to induce the aggregation melamine in a manner that amplifies the colorimetric andor turbidimetric signal of the assay. The second moving papermaking surface is positioned adjacent to the first moving papermaking surface so that a second surface of the paper web faces the second moving papermaking surface. The light-emitting diode die, the insulator and the transparent conductive layer are disposed in the space. The contactor also includes vertical partitions positioned transverse to the liquid flow within the vapor space of each tray to minimize vapor mixing.