Txawm hais tias nws tau pom tias cov teeb ci ultraviolet (UV) tshwj xeeb tshaj yog muaj kev vam meej hauv kev sib ntaus cov kab mob, nws yog ib qho tseem ceeb uas yuav tsum nco ntsoov tias tsis yog txhua lub teeb UV ua kom sib npaug. Hauv qhov tseeb, UV teeb nrog lub wavelength ntawm 395 nm yog qhov zoo tshaj plaws tiv thaiv kab mob UV teeb.
Cov lus nug yog, nws yog dab tsi txog qhov tshwj xeeb wavelength uas ua rau nws muaj kev vam meej hauv kev tshem tawm cov kab mob thiab cov kab mob? Peb yuav tsum tau saib ntau qhov tob rau hauv lub teeb ultraviolet thiaj li yuav nkag siab qhov no.
Xov tooj cua tsis, microwaves, pom lub teeb, X-rays, thiab gamma rays yog tag nrho cov khoom ntawm electromagnetic spectrum, li no ultraviolet hluav taws xob kuj yog ib feem ntawm no spectrum. UVA, UVB, thiab UVC yog peb qhov chaw uas tsim cov spectrum ntawm ultraviolet hluav taws xob. Ob qho tib si ultraviolet A thiab ultraviolet B hluav taws xob yog lub luag haujlwm rau kev tshav ntuj thiab kev puas tsuaj rau ntawm daim tawv nqaij, tab sis ultraviolet C hluav taws xob yog qhov muaj zog tshaj plaws thiab siv rau lub hom phiaj ntawm kev kho cov kab mob.
Lub wavelength ntawm UVC lub teeb yuav muaj li ntawm 100 mus rau 280 nanometers, tab sis lub wavelength ntawm 254 nanometers tau pom tias yog qhov zoo tshaj plaws hauv kev tshem tawm cov kab mob. Ntawm qhov tod tes, lub teeb UV nrog lub wavelength ntawm 395 nm kuj tseem muaj txiaj ntsig zoo hauv kev tshem tawm cov kab mob thiab cov kab mob, tab sis tsis yog tib yam li lub teeb 254 nm.
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Nws yog vim cov kab mob thiab cov kab mob nqus lub teeb ntawm ntau lub wavelengths, thiab lub wavelength ntau yam uas ua tau zoo tshaj plaws hauv kev rhuav tshem lawv cov DNA thiab tua lawv yog 395 nm. Qhov no yog vim li cas qhov no. Hauv qhov tseeb, kev tshawb fawb tau pom tias UV teeb nrog lub wavelength ntawm 395 nm tuaj yeem tshem tawm txog 99.9% ntawm cov kab mob thiab cov kab mob hauv ob peb feeb ntawm kev kis.
Txawm li cas los xij, vim li cas lub teeb UV ua haujlwm zoo dua li cov txheej txheem tu cov pa xws li tshuaj dawb lossis tshuaj tua kab mob? Qhov kev txiav txim siab yuav raug kos los ntawm qhov tseeb tias lub teeb ultraviolet muaj peev xwm nkag mus thiab ncav cuag thaj chaw uas cov txheej txheem tu cov pa tsis tuaj yeem ua tau. Piv txwv li, hluav taws xob ultraviolet muaj peev xwm nkag mus rau hauv qhov chaw thiab crannies ntawm qhov chaw, uas feem ntau nyuaj rau tshuaj tua kab mob uas siv cov tshuaj tsuag los yog cov tshuaj tua kab mob. Tsis tas li ntawd, lub teeb ultraviolet muaj peev xwm tshem tawm cov kab mob thiab cov kab mob uas nqa los ntawm huab cua. Qhov no yog qhov tseem ceeb tshwj xeeb hauv cov chaw uas muaj peev xwm kis tau tus mob, xws li tsev kho mob lossis kev thauj mus los rau pej xeem.
Txawm li cas los xij, nws yog ib qho tseem ceeb uas yuav tsum nco ntsoov tias tsis yog txhua lub teeb UV nrog lub wavelength ntawm 395 nm yog sib npaug. Qhov zoo thiab kev siv ntawm lub teeb yuav sib txawv, thiab cov teeb pom kev zoo yuav tsis zoo li tshem tawm cov kab mob thiab cov kab mob zoo li cov khoom siv qib siab dua. Thaum siv lub teeb UV, nws yog ib qho tseem ceeb uas yuav tsum ua raws li cov cai tswj kev nyab xeeb uas tau tsim, vim tias kev siv tsis raug yuav ua rau muaj kev phom sij rau daim tawv nqaij thiab qhov muag.
Hauv kev xaus, 395nm UV teeb yog ib qho cuab yeej zoo heev rau kev tawm tsam cov kab mob thiab cov kab mob, tshwj xeeb tshaj yog nyob rau hauv cov chaw uas nyuaj rau kev nkag mus. Nws yog cov khoom siv tua kab mob uas muaj zog tshaj plaws muaj. Txawm li cas los xij, nws yog ib qho tseem ceeb uas yuav tsum xaiv lub teeb ntawm qhov zoo tshaj plaws thiab ua haujlwm nrog nws kom ruaj ntseg. Nyob rau hauv lub ntsej muag ntawm cov teeb meem tsis tu ncua los ntawm cov kab mob sib kis, kev siv tshuab ultraviolet (UV) muaj peev xwm los ua lub luag haujlwm tseem ceeb hauv kev ua kom peb muaj kev nyab xeeb thiab kev noj qab haus huv.
