Abstract
Generally considered, great importance must be assigned to the optical radiation in the biosphere of earth. The specific biological effects can be grouped in the following manner: 1) Construction of organic substance a) photosynthesis b) formation of vitamin D c) formation of anthocyanines. 2) Transformation of matter a) pigmentation b) erythema formation c) bactericidal effects 3) Irritating effects a) photoperiodism b) phototropism c) phototaxis d) photonastic movement e) light- and darkness-germination f) photomorphosis g) stimulation of nerves and glands.
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