Systems and methods are provided for transferring value from a voucher to a payment account associated with a consumer. When sleep mode operation is active, the MS enters into a series of sleep cycle and each sleep cycle comprises a listening window followed by a sleep window. Straps attached to the lower pad are adapted to be deployed around the lateral pads and to be attached detachably to one another so as to restrain a patient’s head on the central portion of the lower pad if the positionable pad does not overlie the central portion thereof, or on the positionable pad if the positionable pad overlies the central portion thereof, and between the lateral pads. A three-port valve selects the hot gas or the cooled gas and applies it to a hygrometer. Each of the first blades and the second blades is provided with a clamping device of screw-nut or collet type for varying the angle of attack with respect to the incoming flow of gas and liquid and for securing to the respective strut on the upper surface of the annular partition and at the lower surface of it. The graphitic nanotubes are chemically modified with functional group biomolecules prior to use in an assay.