Christopher J. Knowles, Ph.D., is Senior Lecturer in Biochemistry in the Biological Laboratory of the University of Kent, Canterbury, England. Dr. Knowles received his B.Sc. in chemistry from the University of Leicester in 1964 and his Ph.D. in biochemistry in 1967. From September 1967 to September 1969 he was a Postdoctoral Fellow of the American Heart Foundation at Dartmouth Medical School, Hanover, New Hampshire, U.S.A. In 1969 he returned to Britain as a Science Research Council Postdoctoral Fellow for one year at the University of Warwick. In October 1970 he was appointed Lecturer in Biochemistry at the University of Kent and promoted to Senior Lecturer in October 1977.

• 1. Bacterial Electron Transport to Fumarate 2. Respiration with Nitrate as Acceptor 3. The Strickland Reaction 4. Respiration with Sulfate as Electron Acceptor 5. Respiration in the Ammonia-Oxidizing Sulfur Compounds 6. Heme-Requiring Bacterial Respiratory Systems 7. Respiration in Hydrogen Bacteria 8. Respiratory Electron Flow in Facultative Photosynthetic Bacteria