The phenomenon of ultraweak light emission which is closely related to the process of life and biological activities has recently been recognized. Called as biophoton, this phenomenon has been detected in various plant tissues such as the subroots of onions, the stem of wheat, beans arid seeds, and animals organs like liver, heart, kidneys, lungs and brain, and vital tissues such as muscles and neurons as well as whole blood, blood plasma, membranes, bacteria, yeast, polymorphonuclear leukocytes, monocytes and macrophages, malignant tumor tissues and cells, and other cells. Thanks to recent advancement made in optical electronics, a development base has been established for the quantitative measurement of ultraweak light undetectable by the human eye and for information analysis of its various features. _
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