Physiological processes that are influenced by light abound in nature. Organisms as complex as the human being and as “simple” as bacteria show evidence of having developed photoresponsive systems. Examples are the phototactic behavior of bacteria, plants and animal cells, diurnal variations in social and sexual behavior of animals (including man), and season-related migration patterns in birds. The process of vision is a highly sophisticated photoresponsive process as are the processes in plants that are controlled by the phytochrome systems. (Two reviews that can prove useful are Er langer, 1976 and Briggs and Rice, 1972).
KeywordsCinnamic Acid Trans Isomer Trans Cinnamic Acid Purple Membrane Carbamyl Choline
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