Imisebe ultraviolet

imisebe ultraviolet amandla eliphezulu kakhulu. Kule ndaba, kule nqubo ye ukumuncwa ku ukwakheka kwama-molecule futhi-athomu kungokoqobo ushintsho oluphawulekayo. Amandla amuncwa umzimba, okuyinto lwabelwe imisebe ultraviolet, ingasetshenziswa breaking izibopho ezibuthakathaka amaprotheni molecule. Le nqubo ibizwa ngokuthi photolysis. ukugeleza kwalo kuhambisana kukhululwa izinto asebenzayo ngaphansi kwethonya naphakathi wave ultraviolet ngemisebe.

Esifushane wave imiphumela kuphakamisa denaturation we polymer amaprotheni, okuyinto, ukulahlekelwa umsebenzi wayo, kwenze. imisebe ultraviolet abe eyangithinta ngokukhethekile ku-molecule ye-DNA. Ngaphansi kwethonya ukwephulwa waphawula kabili i-DNA ne cell division. Ngesikhathi esifanayo, imisebe ye-altra kubangele oxidative nokucekelwa amaprotheni izakhiwo. Lokhu kuholela yokufa kwamangqamuzana engokwemvelo. Kodwa izikhwebu ezilimele unekhono ukubuyisela (ukulungisa amnyama). Lokhu kungenzeka ngaphansi kwethonya eside wave UV ngemisebe amandla ebonakalayo ukukhanya. Kulezi izinqubo, ama-enzyme ethile ezihilelekile.

I dark futhi isithombe-esisheshayo ukulungisa basonta isigaba ukusabela zokuzivikela-oluhambelana. Babeka ubunjalo umzimba womuntu bese unikeza isivikelo emiphumeleni emisebe ye-UV.

Okulingene-umphumela amavithamini kusiza ukwenza kusebenze izinqubo kumiswa. Ngakho, imisebe ye-altra kukhona eguquliwe pro-amavithamini eziqukethwe isikhumba, ku kavithamini D. eyenza umuntu acabange eseZwini kuphela omunye kwabayishumi a milimitha, ukuchayeka inikeza kumiswa semali amandla uma siqhathanisa nabanye amagagasi kagesi spectrum infrared kanye ebonakalayo.

Photolysis, futhi denaturation basesimweni ungqimba spinous kwesikhumba. Ndawonye nale kwenziwa ukukhululwa histamine, acetylcholine, ama biogenic. Lezi zinto zehlela avuse ukuthuthukiswa erythema. Kwenzeka ngemuva kwamahora 2-8. imikhiqizo amaprotheni noqhekeko neqhaza ukunwetshwa imithambo yegazi ukuthuthelwa amangqamuzana amhlophe egazi, ukuvuvukala ngaphansi kwesikhumba. Zonke lezi zenzakalo ziyinkimbinkimbi isikhumba ukucasuka receptor viscera receptor lapho ivela neuroreflex ukusabela. Imikhiqizo kwamazinyo washintsha ngemithambo yegazi, ukuhlinzeka ithonya humoral. ngemisebe ultraviolet ngoba MW Range kuvuse impendulo aseptic ukuvuvukala esikhumbeni. Ngu ngosuku lwesibili isifinyelele esiphezulu yayo. Ngosuku lwesikhombisa, ngosuku lwesishiyagalolunye impendulo ukuvuvukala sihamba, esikhundleni tan livela. Dlala wave ngemisebe ngokushesha avuse erythema, kusale lesikhumba omnene.

chromogenic Maximum ehlaselwe eside wave emisebe yama-UV. Ngo melanoblast ise ungqimba basal we epidermis, kusukela tyrosine, nemikhiqizo kwamazinyo adrenaline dihydroxyphenylalanine kwakhiwa melanin. (I-melanin) molecule lakhe elikhulu ukuvimbela ingress ujule dermis izinsalela amaprotheni molecule wabhubhisa emisebe ye-UV by. Ngaphezu kwalokho, amangqamuzana melanin ukuncela infrared kanye spectrum ebonakalayo. Ngakho, isikhumba ivikelwe okweqile nokusha. Ezindaweni ithonya imisebe ultraviolet luyanda lymph nokugeleza kwegazi kuyathuthuka ikhava ukukhishwa, kukhuphuke synthesis collagen ethandele. Lapho erythema okukhulu ogelezayo iyakhula okwenzeka babazi futhi onesifo izinqubo ukuvuvukala.

Ultraviolet ukuchayeka kabanzi lisetshenziswe Cosmetology. Ngakho, ngo-solarium iyashelela futhi enhle tan. Isebenzisa eside wave imisebe, kuyilapho short-naphakathi-emisebeni e ukushuka nokucwala kukhona izihlungi.

Kufanele kuqashelwe ukuthi ukuchayeka ngokweqile elangeni kungaholela ukuguga ngaphambi kwesikhathi, ukwehla kuyaqina kwesikhumba. Ngaphezu kwalokho, kungase ivuswe ngu kumiswa radicals khulula anomthelela umdlavuza.

Ukuze ubone ukuthi umehluko phakathi "eziyingozi" futhi "kuzuzise" isebenzisa Inkomba ilanga UV. Lokhu ipharamitha kubonisa ukuthi ngokuvamile izinga lemisebe Emhlabeni.