Viscoelastic compositions are disclosed herein containing an effective amount of one or more random or structurally defined polycationic quaternary ammonium compounds for controlling the viscoelasticity of the composition. The process includes placing biological materials in separate lysis vessels, adding lysis liquids to the biological materials in the lysis vessels, and transferring the liquids in the lysis vessels into a matrix unit. The spoken comments are transmitted to at least selected ones of the other users so that the selected users can engage in a conversation about the program content as it is simulcast. A data processor determines first elapsed times from the transmission time of the first transmission signal to at least the arrival time at respective corresponding secondary beacons. The median diameter of the aluminium hydroxide particles does not exceed 2 \u03bcm.