Interrelation between M. E. (Medical Electronics and Biological Engineering) and biophysics is discussed from three points of view. Biophysics aims at understanding of essential life processes from the standpoint of physical sciences, and very often biophysicists are interested in formulating in mathematical terms phenomenological functioning of biological systems, such as information processing in central nervous system; such a mathematical or abstract formulation constitutes the foundation required for the simulation of various life processes in biological engineering, Secondly, electronic processes in living organisms are very important subjects of study in biophysics, and the results of these studies may well contribute to new developments of electronics in more or less ordered macromolecular systems. Electron transport in respiratory redox system in mitochondria, transfer of electronic excitation energy among chlorophyll molecules are examples. Thirdly, electronics itself, particularly microwave or optical wave electronics, is of vital importance to the development of new research techniques in biophysics. Implication of electron paramagnetic resonance, Mössbauer effect, maser, laser, ... to biophysics is briefly discussed.
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