Abstract: The invention relates to a multimeric molecule which can imitate a natural multimeric proteinaceous ligand. The invention also relates to a multimeric molecule as defined above which is characterised in that it has the following general formula: A-Xn, wherein: n is equal to 3, 4, 5 or 6; A denotes a chemical group which is functionalised by at least three amine functions or COOH functions; and X denotes a D, B-D or B(D)-D? group, in which B is a spacer and D and D? are peptides or pseudopeptides corresponding to a sequence which is derived from the ligand and selected from residual matter forming the interface with the receptor and which can interact with the receptor.

Abstract: A bi-polar discharger for a coaxial conducting cable is formed by threading rod elements into the ends of a central passage through an internal electrode so as to be electrically conductive therewith. A casing around the internal electrode comprises a cylindrical outer electrode closed at each end by a bead of glass or ceramic which is fitted within an outer metal ring and the casing is sealed with a controlled atmosphere of an inert gas at low pressure by sealing of the outer rings to the cylindrical external electrode and sealing of the rod elements within the beads.