Abstract: Cationic phthalocyanine and/or porphyins salts are used as photosterilising agents for microbiologically contaminated waters, particularly for inactivating Gram-positive and Gram-negative bacteria, yeasts, micoplasmas and parasites. Synergistic action for water photosterilisation by the simultaneous use of the cationic phthalocyanine salt and a porphyrin molecule, which performs its photosterilising action by a mechanism identical with that typical of phthalocyanines, and whose visible light absorption spectrum efficiently complements the absorption of phthalocyanines. The photosterilising salts can be added to the water as a solution, or as a powder or tablet.

Abstract: A system for obtaining a quality image by the use of at least one biometric capacitive fingerprint sensor having a plurality of capacitive sensor cells arranged underneath a surface of dielectric material (11a) and each including at least one capacitor plate, and a plurality of registers, the system comprises the step of modulating any electromagnetic field generated at each capacitor plate in accordance with worst cleaning conditions of said surface (11a) of dielectric material, thereby obtaining a quality image with a correct contrast between ridge and valley of a detected fingerprint.