This text presents all aspects of the chemistry and biological activity of aminophosphinic and aminophosphonic acids and their derivatives including esters and peptides, with emphasis on contemporary research in agrochemical and biomedical applications. The book includes structural and spectroscopic data, covers research in biological activity with special reference to protease inhibition and possible clinical applications, and explores the use of aminophosphinic and aminophosphonic derivatives as agrochemicals and their future potential.