Blood stains are red Ulltraviolet lights are blue Shirt

IntroductionAncient civilizations understood that sunlight provides visibility, warmth, health and vitality. Their understanding of how sunlight provides these life-sustaining influences was immersed in mythology and cultural traditions. Offspring, dissatisfied with the intellectual power of their ancestors’ explanations, sought new mythologies in their search for a better understanding of the cosmos and their relationship with it.Starting in the late 17th century, a new mythology arose in Europe that was based upon scientific principles and provided the basis for a more reliable understanding of the relationship between humans and sunlight. By the start of the 19th century, the application of these principles led to the realization that sunlight is not a single stimulus but, rather, a collection of stimuli of different wavelengths (e.g., infrared, visible, ultraviolet). This realization inspired additional studies aimed at determining whether different wavelengths might be responsible for the different effects of sunlight. As this review documents, indeed they are.This review focuses primarily on studies prior to 1920 that were involved in the discovery of ultraviolet (UV) radiation, its properties, and its influences on living organisms. After 1920, the number of UV-related publications grew rapidly, reaching at least 275 for the years 1920-27 alone (see Laurens, 1928). Between 1960-2001, there are 37,466 publications on the subject “ultraviolet radiation” listed in PUBMED, a U.S. government-supported computer database of health-related research. Due to the extent of the literature, this review covers only the most important studies between 1920-2001. The selection of these studies was made solely by the author, and any omissions and shortcomings are his responsibility. There are a number of excellent reviews on UV photobiology written between 1920-2001, and these should be consulted for more in-depth analyses [cf. Laurens (1); Duggar (2); Blum (3-5); Hollaender (6, 7); Giese (8-10); Jagger (11, 12); Setlow & Setlow (13); Urbach & Forbes (14); Webb (15); Senger (16); Ananthaswamy & Pierceall (17); IARC (18); Black et al. (19); Hanawalt (20)].

Blood stains are red Ulltraviolet lights are blue Shirt

IntroductionAncient civilizations understood that sunlight provides visibility, warmth, health and vitality. Their understanding of how sunlight provides these life-sustaining influences was immersed in mythology and cultural traditions. Offspring, dissatisfied with the intellectual power of their ancestors’ explanations, sought new mythologies in their search for a better understanding of the cosmos and their relationship with it.Starting in the late 17th century, a new mythology arose in Europe that was based upon scientific principles and provided the basis for a more reliable understanding of the relationship between humans and sunlight. By the start of the 19th century, the application of these principles led to the realization that sunlight is not a single stimulus but, rather, a collection of stimuli of different wavelengths (e.g., infrared, visible, ultraviolet). This realization inspired additional studies aimed at determining whether different wavelengths might be responsible for the different effects of sunlight. As this review documents, indeed they are.This review focuses primarily on studies prior to 1920 that were involved in the discovery of ultraviolet (UV) radiation, its properties, and its influences on living organisms. After 1920, the number of UV-related publications grew rapidly, reaching at least 275 for the years 1920-27 alone (see Laurens, 1928). Between 1960-2001, there are 37,466 publications on the subject “ultraviolet radiation” listed in PUBMED, a U.S. government-supported computer database of health-related research. Due to the extent of the literature, this review covers only the most important studies between 1920-2001. The selection of these studies was made solely by the author, and any omissions and shortcomings are his responsibility. There are a number of excellent reviews on UV photobiology written between 1920-2001, and these should be consulted for more in-depth analyses [cf. Laurens (1); Duggar (2); Blum (3-5); Hollaender (6, 7); Giese (8-10); Jagger (11, 12); Setlow & Setlow (13); Urbach & Forbes (14); Webb (15); Senger (16); Ananthaswamy & Pierceall (17); IARC (18); Black et al. (19); Hanawalt (20)].