Term for a system or a chemical reaction (artificial word from reduction and oxidation) in which a reaction partner is reductive (e.g. oxygen ) and the second has an oxidative effect (e.g. hydrogen). This means that the reducing agent (hydrogen) releases electrons to the oxidizing agent (oxygen). In the present example, water is created. With the reduction is basically always one oxidation connected. Both processes together are partial reactions of a so-called redox reaction. This includes many combustion and metabolic processes, such as that fermentation and the photosynthesis, The wine bug Mannitstich arises from the redox reaction of fructose, Both oxidative and reductive components are contained in the wine.