Abstract: The invention relates to a method for selective etching of SiC, the etching being carried out by applying a positive potential to a layer (3; 8) of p-type SiC being in contact with an etching solution containing fluorine ions and having an oxidising effect on SiC. The invention also relates to a method for producing a SiC micro structure having free hanging parts (i.e. diaphragm, cantilever or beam) on a SiC-substrate, a method for producing a MEMS device of SiC having a free hanging structure, and a method for producing a piezo-resistive pressure sensor comprising the step of applying a positive potential to a layer (8) of p-type SiC being in contact with an etching solution containing fluorine ions and having an oxidising effect on SiC.

Abstract: Gel immobilized enzymes are prepared for use in carrying out reactions in hydrophobic solvents. The gel is formed from a gelatinizer such as gelatin or a polysaccharide such as agarose, agar, pectin, sodium alginate or carrageenan. The gel contains a ratio of amount of gelatinizer to amount of water such that the gel is capable of being mechanically divisible into dimensionally substantially stable fragments at a temperature which may reach a lower limit of the gelation temperature range of the gelatinizer. A preferred gel contains 30 to 50% gelatin, and is prepared by forming a mixture of water, enzyme and water-soluble gelatin, heating the mixture to dissolve the gelatin to form a solution, and cooling the solution until it forms a gel.

Abstract: An elastic clamping ring for an enclosed shoe press roll used to clamp the jacket to the gables of the shoe press roll is disclosed. A rigid clamping ring is arranged on the inner side of each gable to form a groove which opens outwardly in the radial direction and in which the elastic clamping ring is received. A stop member is arranged radially outside the elastic clamping ring. By operation of securing members, the rigid clamping ring is forced in the direction of the peripheral gable part in order to squeeze the elastic clamping ring such that it expands outwardly in the radial direction and clamps the edge of the jacket between itself and the stop member. The invention also relates to a shoe press roll that uses an elastic clamping ring with a hexagonal cross section for clamping of the jacket of the shoe press roll to the gables of the shoe press roll.