Book reviewed in this article:Postharvest Biology and Biotechnology. Edited by Herbert O. Hultin and Max Milner.Water Activity and Food. Edited by John A. Troller and J. H. B. Christian.Lipids as a Source of Flavor. Edited by M. K. Supran.Electrical Interactions in Molecular Biophysics. Edited by Raymond Gabler.Functionality and Protein Structure. Edited by A. Pour‐El.Enzyme Engineering, Vol. 3. Edited by E. Kendall Pye and Howard H. WeetallMethods in Enzymology Vol. 46, Affinity Labeling. Sidney P. Colowick and Nathan 0. Kaplan Editors‐in‐Chief. Edited by William B. Jakoby and Meir WilchekHigh Performance Thin‐layer Chromatography. Edited by A. Zlatkis and R. E.