Ultraviolet rays

Ultraviolet rays muaj siab heev zog. Nyob rau hauv no kev twb kev txuas, nyob rau hauv tus txheej txheem ntawm haum nyob rau hauv lub molecular thiab atomic qauv yog niaj pauv tseem ceeb. Lub absorbed zog, uas yog faib ultraviolet rays, yuav siv tau nyob rau hauv tawg tsis muaj zog bonds ntawm cov protein molecules. Qhov no yog hu ua photolysis. Nws khiav yog nrog los ntawm qhov kev tso tawm ntawm active tshuaj nyob rau hauv tus ntawm nruab nrab yoj ultraviolet irradiation.

Luv-yoj los provokes tus denaturation ntawm cov protein polymer, uas, poob nws kev ua, precipitate. Ultraviolet rays muaj ib tug tshwj xeeb muaj feem rau cov DNA molecule. Nyob rau hauv tus ntawm ua txhaum cai doubling ntawm DNA thiab cell division. Nyob rau tib lub sij hawm, ultraviolet rays ua oxidative degradation nyob rau hauv protein lug. Qhov no ua rau cell tuag. Tab sis puas tsuab muaj lub peev xwm los (tsaus nti kho). Qhov no yog tau nyob rau hauv tus ntawm ntev-yoj UV tawg thiab pom lub teeb zog. Nyob rau hauv cov txheej txheem, tej yam enzymes yog muab kev koom tes.

Qhov tsaus ntuj nti thiab lub yees duab-reactive kho mus rau hauv qeb ntawm kev tiv thaiv-adaptive tshua. Lawv nteg qhov xwm ntawm tus tib neeg lub cev thiab muab kev tiv thaiv los ntawm cov teebmeem ntawm UV tawg.

Medium-nyhuv ntawm cov vitamins yuav pab tau qhib cov txheej txheem ntawm tsim. Yog li, lub ultraviolet rays yog hloov dua siab tshiab pro-vitamins muaj nyob rau hauv daim tawv nqaij, mus rau hauv vitamin D. tob tob tsuas yog ib feem kaum ntawm ib millimeter, raug muab tsim ntawm ib tug loj npaum li cas ntawm lub zog nyob rau hauv kev sib piv nrog rau lwm cov electromagnetic vuag ntawm infrared thiab pom spectrum.

Photolysis, thiab denaturation yog nyob rau hauv lub spinous txheej ntawm daim tawv nqaij. Ua ke nrog rau qhov no yog ua li cas histamine tso tawm, acetylcholine, biogenic amines. Cov tebchaw ntxias txoj kev loj hlob ntawm erythema. Nws tshwm sim tom qab 2-8 teev. protein decomposition khoom pab mus rau expansion ntawm cov hlab ntsha, cov tsiv teb tsaws ntawm cov ntshav dawb, o ntawm daim tawv nqaij. Tag nrho cov phenomena yog nyuab daim tawv nqaij voos receptors viscera receptors nrog tshwm sim neuroreflex tshua. Lub lwj cov khoom diverge los ntawm cov hlab ntsha, muab humoral cawv. Ultraviolet irradiation rau MW ntau yam ntxias ib tug aseptic inflammatory teb nyob rau hauv daim tawv nqaij. Los ntawm lub thib ob hnub nws nce mus txog nws siab tshaj plaws. Nyob rau hnub xya, lub cuaj hnub ntawm lub inflammatory teb kis, es tsis txhob ziab tshwm. Luv yoj tawg sai heev ntxias erythema, tawm hauv ib tug me me pigmentation.

Maximum chromogenic cuam tshuam los ntawm ntev-yoj UV rays. Nyob rau hauv melanoblast nyob rau hauv lub basal txheej ntawm lub epidermis, los ntawm tyrosine, thiab lwj cov khoom adrenaline dihydroxyphenylalanine tsim melanin. Nws (melanin) giant molecules tiv thaiv ingress ntxaum mus rau hauv lub dermis tawg tsam ntawm protein molecules puas yog UV tawg. Nyob rau hauv tas li ntawd, cov melanin molecules nqus infrared rays thiab pom spectrum. Yog li, ntawm daim tawv nqaij yog kev tiv thaiv los ntawm overheating thiab hlawv. Nyob rau hauv qhov chaw ntawm lub hwj ntawm ultraviolet rays yog nce qog thiab cov ntshav khiav yog zoo cover tsuaj, nce synthesis ntawm collagen fibers. Thaum khaus erythema ntws amplified tshwm sim acutely thiab ri inflammatory dab.

Ultraviolet raug yog dav siv nyob rau hauv cosmetology. Yog li ntawd, nyob rau hauv lub solarium yog du thiab zoo nkauj tan. Nws yuav siv ntev-yoj rays, thaum lub sij hawm luv luv-thiab medium-tawg nyob rau hauv tanning cov khw txiav yog cov ntxaij lim dej.

Nws yuav tsum tau muab sau tseg hais tias ntev li raug tus kab mob mus rau lub hnub yuav ua tau kom ntxov ntxov laus, ib tug txo nyob rau hauv lub elasticity ntawm daim tawv nqaij. Tsis tas li ntawd, tej zaum nws yuav qhib kom ua huaj los ntawm lub tsim ntawm radicals dawb uas ua rau kom mob cancer.

Yuav kom txiav txim seb qhov kab ntawm "teeb meem" thiab "pab" siv lub hnub UV index. Qhov no parameter qhia cov qib ntawm hluav taws xob rau lub ntiaj teb.