Solar radiation
Solar beams have an effect on an organism all parts of the spectrum. Depending on length of a wave the solar spectrum shares on three parts: ultra-violet, visible and infra-red. The greatest influence on fabrics renders the ultra-violet radiation which length of a wave makes 10-400 nanometers. At
To the characteristic of biological action of ultra-violet radiation distinguish its three areas: the first area with length of a wave from 400 to 320 nanometers possesses poorly expressed biological action, the second with a length of a wave from 320 to 280 nanometers - antirachitic action and action on a skin, the third with length of a wave 280 nanometers and more low has destroying an effect on fabric fibers. This radiation does not reach a terrestrial surface owing to what the life on the Earth is possible. Ultra-violet radiation is late any obstacle in atmosphere - a dust, gases, steams. Therefore all resorts, sanatoria, rest houses are under construction far from the big cities and the industrial enterprises.
Under the influence of ultra-violet radiation in lipoidah skin there is a transformation ergosterina and cholesterol sootvestvenno in ergokaltsiferol and holekaltsiferol (vitamins D 2 and D 3 ), causing antirachitic action of radiation. It is thus condensed epidermis and the pigment melanin is formed - the skin gets a brown shade (sunburn).
Ultra-violet radiation of the Sun possesses also bactericidal action.
Influence of visible radiation of the Sun (length of a wave of 400-760 nanometers) is carried out basically through the visual analyzer. The beams located more close to a red part of a spectrum, operate excitingly, yellow and green - uspokaivajushche, dark blue and violet depressing.
Invisible infra-red radiation with length of a wave 760-2500 nanometers has mainly deep thermal an effect therefore at a long irradiation there are burns and the general overheating.
The Sunlight makes active enzymes, influences various kinds of a metabolism in an organism. At children deprived of influence of a sunlight, the rickets develops. At adults fragility of bones which at crises slowly grow together is observed, a teeth easily collapses. This condition is called ' as light starvation ' which is often observed at miners, the people living in the north. For the prevention of such infringements it is recommended to be irradiated regularly with ultra-violet beams in special fotarijah, to take vitamins of group D.
Thus, the sunlight represents the powerful preventive and medical factor promoting improvement of environment, perniciously operating on microorganisms. Operating on an organism through the visual analyzer, a sunlight renders SYOoe influence on physiological processes in an organism, changing a metabolism, the general tone, a dream rhythm etc.
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