350 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS (5) D. K. Davis, Charge generation on dielectric surfaces, Brit. J. Appl. Phys. (J. Phys. D.), 2, 1533 (1969). (6) D. A. Seanor, Triboelectrification of polymers--A chemist's viewpoint, Physicochem. Aspects Polym. Surf., Proc. Int. Symp., 1, 477 (1983). (7) D. K. Davis, The examination of the electrical properties of insulators by surface charge measure- ment,J. Sci. Instrum,, 44(7), 521 (1967). (8) T. J. Lewis, "The Movement of Electrical Charge Along Polymer Surfaces," in Polymer Surfaces, D. T. Clark and W. J. Feast, Eds. (John Wiley and Sons, Chichister, 1978). (9) C. B. Duke and T. J. Fabish, Contact electrification of polymer: A quantitative model, J, Appl. Phys., 49(1), 315 (1978). (10) A. Hambidge and L. Wolfram, unpublished results.

j. Soc. Cosmet. Chem., 38, 351-352 (September/October 1987) Book Review ADVANCED BIOCHEMICAL ENGI- NEERING, Edited by Henry R. Bungay and Georges Belfort. Wiley-Interscience, John Wiley & Sons, New York, 1987. Reading over this book evokes one par- amount question: why? It is certainly not a bad book but it is, with equal certainty, an unnecessary one. According to the preface, the volume comprises the contri- butions of the instructors who have taught a summer short course entitled Biochemical Engineering.' Separations, Fermentation, and Genetics, at the Rensselaer Polytechnic In- stitute. Collective volumes, despite the most heroic efforts of editors, generally lack a clear theme and often exhibit great differ- ences in the scope and type of treatment / afforded the various topics. This book is no exception. Despite the term "ad- vanced" in the title, some sections are ele- mentary in their approach. This is under- standable when one recognizes that a summer course cannot require prerequi- sites. Participants come to it with varied backgrounds and many will surely need a brief introduction at a beginning level. Publishing such material, however, is hardly justified. Before commenting on the several chapters, I must note one more general criticism. Nauman opens the book with a perceptive and interesting overview of biochemical engineering, but he falls into the common (in my view) trap of associ- ating "biochemical engineering" only with the "bioprocess" component of "bio- technology." Bioprocesses are those in which living cells or their components, e.g. enzymes, are used to carry out desired chemical or physical changes. It is also implied that the industrial application of biochemical systems lies mainly in the fu- ture. This ignores, of course, the substan- tial "biochemical industry" (book's term) which already exists and which is many decades old. Unfortunately, this limita- tion continues, with one exception, throughout the book. For readers of this journal such a viewpoint is especially in- appropriate. The technological exploita- tion of materials extracted from plant and animal tissues is not only centuries old, but it constitutes a major part of biotech- nology in the proper sense. After Nauman's limited but thoughtful introduction, Bungay, Clesceri, and Tsao discusses Microbial Cells and Enzymes. Here, a r(umber of basic concepts re- garding biocatalysis by cells and enzymes are combined with provocative insights. Although elementary in places, there are some real chestnuts here for the practi- tioners of bioprocess technology. Kleinstreuer follows with an Analysis of Biological Reactors. After a brief (7 pages, many figures and tables), informative summary of bioreactor types, we en- counter 23 pages devoted to the mathe- matical modeling of these units. The basic relationships employed have been pre- sented elsewhere much more completely, while the extensive mathematical develop- ment and modeling flowcharts and simu- lations which follow are,1 believe, a waste of paper. The next section (Biomass Refining) is by Tsao, Ladisch, and Bungay, who are true authorities on the subject. Their treat- ment is well-organized and clearly written, but it rehashes material presented 351