ABSTRACT: Technical alternatives for the production ofSingle-Cell Protein (SCP), and the operational and economicaspects of these alternatives are discussed. Topics include:1) SCP for human and animal consumption; 2) cellcollection, fermentation, and protein extraction techniques;3) production and processing methods; 4) uses of carob,agricultural wastes, cane, coffee, whey, sulfite liquor,methane, and yeast in SCP production; 5) evaluation methods;6) marketing procedures; and 7) international applicationsand guidelines.

As the number of dairy farms is increasing, it is obvious that the discharge of whey from them can affect the environment. In other hands with this current population explosion and the limited land resources, the world will be soon unable to feed its population. That means protein gap also would continue to increase unless well planned measures are adopted to handle the situation. It is therefore, important to increase protein production by utilizing all the available ways and means. In order to bridge this gap, Single Cell Protein production is an innovative and an alternative way. Thus, this microbial biomass production and bioconversion of the wastes through microbial degradation and is the natural way to recover resources. As far as Single Cell Protein production is concerned, yeasts are probably the most widely accepted. Therefore this work delivers the information about yeast species which can be found in dairy products, their potential in converting substrate lactose to Single Cell Protein and their identification system. Therefore the researchers who have an interest in this area, the food processing industries and the environmentalists can be benefited from this work.

In early 1973, I returned to Israel from a post-doctoral fellowship at Harvard University, and was accepted as a lecturer in the Department of Applied Microbiology at the Hebrew University of Jerusalem. Shortly after my return, Professor Richard Mateles, who at that time was head of the Department, suggested that I purchase a good and comprehensive book on single cell protein (SCP) in order to expand my general knowledge in the subject I had started then to work on; that was microbial utilization of one-carbon (C ) compounds. l Naturally, I took his advice (after all, he was the Boss) and bought the book, which was the only general book published on this subject at that time, and was based on papers presented at the First International Conference on Single Cell Protein, held at the Massachussetts Institute of Technology (M.I.T.), on October 1967 (Mateles and Tannenbaum, editors) [1]. Through this book I became acquainted with the world's hunger problem that existed in the past, and ways in which it was to be solved by SCP products prepared from CO , fossil-based raw 2 materials, and from wastes.

Biochemical Engineering and Biotechnology, 2nd Edition, outlines the principles of biochemical processes and explains their use in the manufacturing of every day products. The author uses a diirect approach that should be very useful for students in following the concepts and practical applications. This book is unique in having many solved problems, case studies, examples and demonstrations of detailed experiments, with simple design equations and required calculations. - Covers major concepts of biochemical engineering and biotechnology, including applications in bioprocesses, fermentation technologies, enzymatic processes, and membrane separations, amongst others - Accessible to chemical engineering students who need to both learn, and apply, biological knowledge in engineering principals - Includes solved problems, examples, and demonstrations of detailed experiments with simple design equations and all required calculations - Offers many graphs that present actual experimental data, figures, and tables, along with explanations