Explanation
Due to the biological activity of organisms, the properties of non living substances undergo changes that are not conducive to human needs, that is, the intrinsic value of non living substances is weakened. This change can be mechanical, physical, chemical, or aesthetic, not necessarily the chemical decomposition of matter. The bioerosion process can be divided into two categories: ① mechanical, including non nutritive substances eroded and perforated by insects and rodents, such as insulation and lead pipes on cables damaged; Buildings or other structures can also suffer damage due to the growth of plant roots; ② Chemical, including assimilation and alienation effects, assimilation effect refers to the use of substrates in substances by organisms as nutrient sources; Alienation effect refers to the biological production of metabolites, such as acids or toxins, which can cause corrosion, mildew, discoloration, deterioration or render them unusable.
Classification
Biomedical materials -> Basics of Biomedical Materials