Abstract: The fibrous polymeric material based on polyvinyl chloride contains at least one antiseptic mercury derivative distributed in its polymeric structure in the form of a substantially molecular and practically non-releasable dispersion.The preferred mercury derivatives have the following general formula: ##STR1## in which Y is H or HgX. If the concentration of the derivative is equal to at least 0.5% by weight, relative to the chlorofiber, the latter has a permanent antiseptic character.This material is obtained by incorporating the above-mentioned derivative into the collodion when the chlorofiber is spun.

Abstract: The device comprises at least one element for immobilizing certain molecules contained in the medium to be tested. According to the invention, the immobilizing element is in the form of a hydrophilic material fixed on the surface of a plane hydrophobic material, such as for example viscose fibers (2) implanted by flocking into a sheet (3) of polyvinyl chloride. The device (4) further comprises:(a) a bottom plate (5) supporting the plane hydrophobic material,(b) at least one cavity (6) for the liquid medium to be tested, said cavity having an outlet orifice (9) situated above the plane hydrophobic material, and(c) scraping means (8) acting on the hydrophilic material (1) and capable of moving the liquid contained therein over the surface of the plane hydrophobic material (3).

Abstract: For treating textile yarns by electrical discharge, the yarn is caused to travel along a path within at least one module. The module has a first and a second electrode confronting each other. A generator is connected to the electrodes to provide a voltage sufficient to strike an arc. The power of the generator and the impedance of the circuit are such that the arc is quenched after striking in a time which is short as compared to the time of rise to the arc striking voltage.