I Immunochemistry and Immunoassays.- I.1 Antigens.- I.2 Antibodies.- I.3 Antibody production.- I.4 Antibody-antigen reaction.- I.5 Immunoassays.- II Immunoassays in Agriculture.- II.1 Immunoassays for animal husbandry.- II.2 Immunoassays in plant production.- III Immunoassays in the Agrofood Industry.- III.1 Milk and cheese industries.- III.2 Other fermentative processes.- III.3 Immunoassays for meat products.- III.4 Thermo-extrusion.- III.5 Food storage.- IV Immunoassays for the Environment.- IV.1 Water pollution.- IV.2 Soil pollutants.