The existence of coherent excitations in active biological systems has been established in recent years. The present book aims at presenting a survey on the many features that such ex- citations can exhibit. This does not mean that a "theory of biology" has been established but it implies that such a theory will make use of such excitations. It is hoped that the present book will help in this direction. April 1988 H. Frohlich Contents Theoretical Physics and Biology H. Frohlich . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 . . . . . . . . Theory of Non-linear Excitations F. Kaiser (With 9 Figures) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 Structures, Correlations and Electromagnetic Interactions in living Matter: Theory and Applications E. Del Giudice, S. Doglia, M. Milani and G. Vitiello. . . . . . . . . . . . 49 Resonant Cellular Effects of Low Intensity Microwaves W. Grundler, U. J entzsch, F. Keilmann and V. Putterlik (With 14 Figures) . . . . . . . . . . . . . . . . . . . . . . . . . . . 65 . . . . . . . The Influence of Low Intensity Millimetre Waves on Biological Systems F. Kremer, L. Santo, A. Poglitsch, C. Koschnitzke, H. Behrens and L. Genzel (With 17 Figures) . . . . . . . . . . . . . . . . . . . . . . . . 86 Metastable States of Biopolymers J. B. Hasted . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102 Physical Aspects of Plant Photosynthesis F. Drissler (With 25 Figures) . . . . . . . . . . . . . . . . . . . . . . . . . . . 114 Emission of Radiation by Active Cells J. K. Pollock and D. G. Pohl (With 6 Figures) . . . . . . . . . . . . . . . . 140 Physiological Signalling Across Cell Membranes and Cooperative Influences of Extremely Low Frequency Electromagnetic Fields W. R. Adey (With 7 Figures) . . . . . . . . . . . . . . . . . . . . . . . . . . . 148 The Interaction of living Red Blood Cells S. Rowlands (With 2 Figures) . . . . . . . . . . . . . . . . . . . . . . . . . . 171 The Genetic Code as Language F. Frohlich . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 192 . . . . . .