Network resources for a call between a calling party and a called party are allocated. A bias resistance ratio is adjusted in accordance with a change in the threshold voltage Vth of a transistor. \u201d Bandwidth allocation is achieved by transmitting from a CMTS to a cable modem a unique bandwidth allocation message for each upstream channel in a bonded group of upstream channels, wherein the combination of unique bandwidth allocation messages collectively allocates requested bandwidth across the bonded group. The antimicrobial agent may be a biguanide, such as polyhexamethylene biguanide. This allows the buyer to facilitate planning for arrival of shipments to improve efficiency, leading in potential cost savings. The method comprises the steps of identifying, on the basis of cartographic data, an initial search field that includes the predetermined location, searching for a POI in the search field, and iteratively enlarging the search field and searching for the POI in the enlarged search field until the predetermined search time has elapsed or the predetermined number of POI hits has been attained.