<unk>  can be defined as any process that uses microorganisms, fungi, green plants or their enzymes to return the environment altered by contaminants to its original condition.<unk>  may be employed to attack specific soil contaminants, such as degradation of chlorinated hydrocarbons by bacteria. An example of a more general approach is the cleanup of oil spills by the addition of nitrate and/or sulfate fertilisers to facilitate the decomposition of crude oil by indigenous or exogenous bacteria.
Bioremediation
Detoxification
Sterilization 
Organocatalysis
Cytoluminescent therapy
Halogenation
Transmetalation
Resorption