A circuit in accordance with one embodiment of the invention can include an LED drive circuit that may isolate a sense circuit from a supply voltage in a passive mode, and maintain a predetermined voltage difference between the sense circuit and the supply voltage in an operational mode. A database has information on components in the network and configuration settings for the components. The gettering material is then deposited over the indentation features. Flow leaving the collector is directed through an SCR catalyst where catalytic reduction of NOx occurs. The seat belt buckle has a release mechanism for releasing from the seat belt buckle a buckle tongue that is assembled with a seat belt webbing. In another aspect of the device, the guide assembly is an arm or a housing that rotates about the tissue specimen.