Disclosed are compositions and methods for analyzing a target sequence in a sample. The pole faces of the end faces of the coil cores are aligned with pole faces of permanent magnets which are retained non-rotatably in or on the rotor and each have a polarity which is successively reversed in the peripheral direction. The second electrical conductor overlying the first electrical conductor such opposite longitudinal edges of the second electrical conductor extend beyond corresponding longitudinal edges of the first electrical conductor at all locations by predetermined distances. A comparing module compares the MTF with a predetermined MTF to determine quality of the lenses. The upright alignment generates a stable uniform emission current and provides excellent emission characteristics. The use of one or more plasticizers reduces or eliminates bubbling or hazing of the contacted surface during solvent evaporation.