In the disk diffusion assay a micro

In the disk diffusion assay a micro-organism is classed as sensitive or resistant to a material based on the radius of the zone of inhibition which forms around a small filter paper disk containing the test material. In comparison to antibiotics, the properties of nanomaterials are less consistent, with significant variations between batches in terms of particle
size distribution, bioactivity, purity and surface chemistry [28,19].