Biocide: Active substance that destroys or prevents the development and action of unwanted living microorganisms such as fungi and bacteria. Biocompatibility: Ability of a material to interact properly with a biological system, without causing damage or rejection. Biopolymer: Compound produced by a living being or through material based on renewable sources. Nanoparticles: Microscopic particle size of less than 100 nanometers. Nanometer: Unit of measurement of length of the International System equivalent to 10^-9 of one meter [symbol: nm]. Nanotechnology: Science that studies the manipulation of the atom or molecule and intends to apply the technology in mechanisms atomic and molecular scale.