Methods for fabrication of nanopillar field effect transistors are described. The gas chromatograph includes a first bridge circuit with a sample sensor connected therein and a second bridge circuit with a reference sensor connected therein. In one embodiment, the inner coiled support member is partially embedded in the polymeric tube. A roller blade comprising the roller mounting apparatus is also disclosed. Some embodiments secure printing from remote locations, authenticate users in distributed systems, authenticate data to users in distributed systems, and address problems with conventional voter registration and absentee ballots. The removal layer may takes the form of an open net-like material that may extend beyond one or more edges of the adhesive layer for grasping with the fingers, attaching auxiliary devices, or other purposes.