Imitha ye-ultraviolet
Kwifiziksi, imitha ye-ultraviolet [1], ehlala ifinyeziwe kwi-UV kwaye eyaziwa ngokuba yimitha ye-UV okanye ukukhanya kwe-UV, ithathwa njengemitha ye -electromagnetic spectrum phakathi kokubonakalayo. ukukhanya kunye ne -4 nm . [2] Imitha ye-Ultraviolet yenza malunga ne-10% yokukhanya okukhutshwa liLanga kwaye iveliswa ziigesi ze-ionized kunye nezibane ezithile ( izibane zemercury vapor kunye nezibane zeWood ).
Imitha ye-UV ayibonakali emehlweni abantu, ngokuqhelekileyo ayiboni ukukhanya ngobude obungaphantsi kwama-390. nm. Nangona kunjalo, kukho okungafaniyo: phantsi kweemeko ezithile, abantwana kunye nabaselula banokubona i-ultraviolet ukuya kuma-310. nm. [3] [4] I -lens, ngokubanzi, ihluza i-UV-B okanye i-frequencies ephezulu, kodwa abantu abaphethwe yi-pathologies efana ne -aphasia (ukungabikho kwe- lens ) banokubona kwakhona kwi-UV band. Imitha yeUV ekufutshane nobude obubonakalayo ebantwini inokubonwa zizinambuzane, [5] ezinye izilwanyana ezincancisayo kunye neentaka ezininzi.
Imitha ye-UV inamandla kakhulu, inamandla amakhulu e-ionizing kunye ne-photoelectric, ibangela i-fluorescence kunye ne -phosphorescence kwizinto ezahlukeneyo, kwaye ineziphumo ezibonakalayo zebhayoloji, kuquka nokuguqulwa kwesakhiwo se -DNA . [1] I-UV kubude bamaza amade (ukusuka ~ 200 ukuya kwi-400 nm) inokubangela ukusabela kweekhemikhali, njengokukhazimla okanye i-fluorescence phenomena.
Iimpembelelo zebhayoloji ze-UV, ngenxa yokusebenzisana kwazo kunye neemolekyuli zezinto eziphilayo, zinoxanduva lweziganeko ezifana nokutshisa, i-freckles kunye nokutshiswa kwelanga; zikwamela oyena nobangela womhlaza wolusu . Nayiphi na into ephilayo inokonakala kanobom yimitha ye-UV evela eLangeni ukuba indawo elungileyo yemitha yemitha ibingahluzwanga yiatmosfera yoMhlaba . Ubude obufutshane be-ultraviolet, obungaphantsi kwe-121 nm, bukhupha umoya ngokukhawuleza kangangokuba uphantse ufunxeke ngokupheleleyo ngaphambi kokuba ufikelele emhlabeni. Ngakolunye uhlangothi, i-ultraviolet nayo inoxanduva lokuqinisa amathambo, ukuthatha inxaxheba ekubunjweni kwe-vitamin D, kwiindawo ezininzi ze-vertebrates zomhlaba [6], ngoko ke i-UV inemiphumo enenzuzo kunye neyingozi kwimpilo yabantu (kuxhomekeke kakhulu kwi-dose).
- ↑ 1.0 1.1 "ultraviolétto - Treccani" (in Italian)
- ↑ "ultravioletto - Treccani" (in Italian)
- ↑ Lynch, David K.; Livingston, William Charles (2001) Color and Light in Nature (in English) (2nd ed.) Cambridge, UK: Cambridge University Press p. 231 ISBN 978-0-521-77504-5
- ↑ Dash, Madhab Chandra; Dash, Satya Prakash (2009) Fundamentals Of Ecology 3E (in English) Tata McGraw-Hill Education p. 213 ISBN 978-1-259-08109-5
- ↑ UV Radiation as an Attractor for Insects (in English) 9 (1)
- ↑ Sunlight and Vitamin D (in English) 5 (1) 1º gennaio 2013 pp. 51–108 ISSN 1938-1972 PMC 3897598 PMID 24494042 doi:10.4161/derm.24494