Cheza ultraviolet

cheza ultraviolet ndi mphamvu kwambiri. Pa nkhani imeneyi, m'kati mayamwidwe mu dongosolo maselo ndi atomiki akukumana atasintha. The mphamvu odzipereka, amene allocated cheza ultraviolet, angagwiritsidwe ntchito kuswa zomangira ofooka zedi. Zimenezi amatchedwa photolysis. madziwo limodzi ndi kutuluka kwa yogwira mchikakamizo cha sing'anga walitsa yoweyula ultraviolet.

Zotsatira Short-yoweyula amakwiya ndi denaturation wa mapuloteni polima, amene akusiya ntchito yake, precipitate. cheza ultraviolet ndi amadza wapadera pa DNA. Mchikakamizo cha kuphwanya anati anawaonjezera kuwirikiza kawiri DNA ndi kugawikana selo. Pa nthawi yomweyo, kuwala ultraviolet chifukwa kudzitsitsa zobwera chifukwa cha okosijeni mu nyumba mapuloteni. Zimenezi zimabweretsa selo imfa. Koma maso kuonongeka angathe kubwezeretsa (mdima kukonza). Izi ndi zotheka mchikakamizo cha kuleza yoweyula dzuwa limakhala lamphamvu ndi zooneka kuwala mphamvu. Mu njira imeneyi, ena michere zedi.

The mdima ndi chithunzi-zotakasika kukonza a gulu mosiyanasiyana zoteteza-dziphunzitsiranso. Iwo adagonesa chikhalidwe cha thupi ndi kupereka chitetezo chifukwa cheza dzuwa.

Sing'anga-zotsatira za mavitamini amathandiza kuti yambitsa njira ya mapangidwe. Choncho, kuwala ultraviolet ndi wotembenuka ovomereza-mavitamini ali khungu, mu vitamini D. ozama yokha chakhumi cha millimeter ndi zimenezi, kuonera amapereka mapangidwe wambirimbiri mphamvu poyerekeza ndi ena mafunde mu atomu a infuraredi ndi zooneka sipekitiramu.

Photolysis, ndi denaturation ali wosanjikiza spinous wa khungu. Pamodzi ndi zimenezi histamine kumasulidwa, acetylcholine, amines biogenic. mankhwala awa imautsa chitukuko cha erythema. Zimachitika pambuyo maola 2-8. mapuloteni kuwonongeka mankhwala zimathandiza kupititsa patsogolo Mitsempha, ndi kusamuka kwa maselo oyera, kutupa kwa khungu. zochitika zonsezi zovuta khungu likuyabwa zolandilira viscera zolandilira ndi zochita yatsoka neuroreflex. The mankhwala kuwola mogwirizana kudzera m'magazi, kupereka chikoka humoral. Ultraviolet walitsa kwa MW osiyanasiyana kuutsa munthu amene aseptic yotupa mu khungu. Ndi tsiku lachiwiri akafika pazipita ake. Tsiku lachisanu ndi chiwiri, tsiku lachisanu ndi chinayi la ayankhe yotupa chitadutsa, m'malo Satana akuwonekera. Short yoweyula cheza mofulumira imfayo erythema n'kusiya mtundu wofatsa.

Zolemba malire chromogenic anakhudzidwa ndi kuleza yoweyula UV kunyezimira. Mu melanoblast ili mu wosanjikiza woyambira wa khungu, kuchokera tyrosine, ndi mankhwala kuwola zikuwonjezereka masiku ano dihydroxyphenylalanine anapanga melanin. Wake (melanin) mamolekyulu chimphona kuteteza ingress zambiri za dermis makombo a zedi anawonongedwa ndi cheza dzuwa. Komanso, melanin mamolekyulu kuyamwa cheza infuraredi ndi zooneka sipekitiramu. Choncho khungu zimatetezedwa ku kutenthedwa ndi moto. M'madera a chikoka kunyezimira ultraviolet ndi kuchuluka lymph ndi magazi ali bwino chivundikiro kusinthika, kuchuluka kaphatikizidwe ulusi kolajeni. Pamene erythema kwambiri loyenda nakweza zikuchitika bwinobwino ndi matenda njira yotupa.

Ultraviolet kukhudzana chimagwiritsidwa ntchito cosmetology. Choncho, solarium ndi yosalala ndi wokongola Satana. Iwo amagwiritsa kuleza yoweyula cheza, pamene yochepa ndi sing'anga-cheza mu khungu salons ndi Zosefera.

Tikumbukenso kuti kukhudzana kwambiri ndi dzuwa kungachititse kuti ukalamba msanga, kuchepa mu elasticity wa khungu. Komanso, akhoza adamulowetsa mwa mapangidwe ankafuna kusintha zinthu mopitirira ufulu zimene zimachititsa khansa.

Kudziwa mzere pakati pa "zoipa" ndi "opindulitsa" amagwiritsa dzuwa UV index. chizindikiro Izi zikusonyeza mlingo wa poizoni Padziko Lapansi.