Abstract: An apparatus for performing mixing in thin liquid layers containing a suspension of a multiplicity of movable particles of magnetic material. The apparatus includes at least two magnets or magnet systems, of which at least one is an electromagnet. the magnets or magnet systems are arranged in order to provide at least one slit for receiving at least one support containing the thin liquid layer, wherein the magnetic particles are present. When the liquid layer in the support is inserted in the slit, the thin layer will be subjected to the combined magnetic field orginating from the two magnets or magnet systems. The apparatus has a driving source for the electromagnet(s), including a timing device, and a current source.

Abstract: Novel tobacco compositions which when subjected to an elevated temperature below the combustion temperature the tobacco liberates essentially pure nicotine. The invention also includes a method for liberating nicotine from the compositions and a device for carrying out the method.

Abstract: Novel tobacco compositions which, when subjected to an elevated temperature below the combustion temperature of the tobacco, liberates essentially pure nicotine. The invention also includes a method for liberating nicotine from the compositions and a device for carrying out the method.

Abstract: Disposable cuvette for essentially simultaneous sampling of a fluid and analyzing the sample. The new cuvette comprises a body member having at least one cavity defined by surrounding walls, into which cavity the sample is permitted to enter by capillary force through an inlet communicating said cavity with the exterior of the body member. According to the invention, the cuvette is characterized in that at least a portion of the walls facing the cavity consists of a semipermeable membrane, optionally with an integrated electrode and/or sensor system, and that at least one reagent or reagent system is incorporated in the cuvette.

Abstract: A cuvette for sampling with a cavity which is defined by two planar surfaces which are placed or can be placed at a predetermined distance from one another. A reagent is contained in the cavity in an amount which is exactly determined in relation to the volume of the cavity. The sample is drawn into the cavity preferably by capillary force and mixed with the reagent therein spontaneously or by vibration, whereupon optical analysis takes place directly through the two planar surfaces.