Vim li cas lub wavelength tseem ceeb heev?
Hauv lwm lo lus, aUV teebyuav tsum ua kom fluorescence thiaj li ua tau zoo. Yog tias koj yuav qhov tsis ncaj ncees lawm UV wavelength, koj tuaj yeem ploj tag nrho cov cim vim tias tsis yog txhua qhov UV wavelengths tuaj yeem tsim cov teebmeem fluorescence txaus.
Feem ntau ntawm cov fluorescence yog brightest ntawm wavelengths txog 360 nm, tab sis zoo tagnrho wavelengths yuav txawv nyob ntawm seb cov khoom thiab cov khoom. Yog li, nws yog ib qho tseem ceeb uas koj tau txais lub teeb UV teeb nrog lub wavelength ntawm 365 nm los yog ze rau nws; Txwv tsis pub, UV hluav taws xob nws tsim tuaj yeem ua tsis tau zoo thiab tsim cov fluorescent glow uas xav tau.
Higher wavelength LEDs yog qhov yooj yim dua thiab pheej yig dua los tsim vim tias kev txhim kho hauv LED tsim. Yog li ntawd, 405 nm (borderline pom violet lub teeb) thiab 415 nm (pom, violet teeb) LEDs nquag ua haujlwm ua "ultraviolet" LEDs. Nws yog qhov ua tau tias tus neeg muag khoom lossis cov chaw tsim khoom siv lub violet lossis ntshav LED uas tsis yog qhov tseeb UV lub teeb, yog li ceev faj yog tias lawv tsis qhia qhov wavelength.
395nm yog qhov kev xaiv nrov wavelength. Thaum peb txais yuav lub ntsiab lus ntawm UV, uas yog tsawg dua 400 nm, cov no yog technically ultraviolet LEDs. Txawm li cas los xij, ib feem tseem ceeb ntawm lub zog tawm los ntawm cov LEDs no tseem yog lub teeb violet vim lawv qhov sib thooj rau 400 nm txiav tawm. Vim tias yuav tsis muaj qhov qis dua-yooj yim txausUV teebTxhawm rau ua kom muaj fluorescence, ntau yam khoom yuav raug teeb rau hauv cov xim violet xim.
Nws puas muab lub zog txaus?
Hauv lwm lo lus, koj yuav tsum ua kom paub tseeb tias koj muaj ob qho tib si zoo (zoo wavelength) thiab kom muaj nuj nqis ntawm UV hluav taws xob, vim tias txawm tias txoj cai wavelength tuaj yeem ua tsis tau zoo yog tias tsis txaus ntawm nws.
Qhov txawv ntawm UVA, UVB, UVC yog dab tsi?
Qhov ntev tshaj plaws wavelength, yam tsawg kawg yog txaus ntshai rau tib neeg lub qhov muag, thiab zoo tshaj plaws yog UV-A hluav taws xob, uas yog tsis pom zoo rau qhov muag liab qab (nruab nrab ntawm 315 thiab 420 nm). UV-A yog hom teeb pom kev zoo tshaj plaws ntawm ultraviolet txij li feem ntau ntawm nws taug kev los ntawm ozone txheej.
UV-B hluav taws xob, uas muaj li ntawm 280 txog 315 nm, feem ntau yog siv rau hauv dej kom tsis muaj menyuam thiab tshem tawm kom tsis txhob muaj kab mob loj hlob ntawm cov pwm thiab spores ntawm cov nroj tsuag. Qhov no yog ua tiav los ntawm kev txo cov kab mob hauv cov dej uas pwm thiab spores feem ntau ua raws thiab loj hlob los ntawm.
UV-C hluav taws xob, uas feem ntau pom muaj qis dua 280 nm, feem ntau tsis pom nyob rau hauv tshav ntuj vim nws raug lim tawm los ntawm txheej ozone. Txawm li cas los xij, cov nroj tsuag tuaj yeem loj hlob ntau dua thaum raug UV-C ntawm qhov kev xav tau zoo. Qhov wavelength no lav tias pwm thiab tshuaj tua kab uas tuaj yeem tshwm sim thaum cog kev loj hlob raug txo lossis tshem tawm, ua rau cov nroj tsuag muaj kev vam meej nyob rau hauv cov xwm txheej loj hlob zoo.
Lub hnub emissions loj ntim ntawm UV-A (315-400 nm) thiab UV-B (280-315 nm) hluav taws xob rau hauv peb cov huab cua. Vim tias UV-B wavelengths luv dua, lawv muaj kev phom sij ntau dua. UV-B rays yog lub luag haujlwm rau feem ntau ntawm kev phom sij ntawm lub hnub ntev, suav nrog kev tshav ntuj, qhov muag tsis pom kev, thiab mob qog noj ntshav.UV tube teebnrog wavelengths ntawm 365 nm los yog siab dua yog suav tias yog tsawg txaus ntshai tshaj cov uas muaj UV-B wavelengths vim hais tias lawv tawm hauv cheeb tsam UV-A.
Dab tsi yog cov txiaj ntsig ntawm UV-A, UV-B & UV-C hauv horticulture?
Thoob plaws hauv seem no, nws yuav npog cov txiaj ntsig ntawmultraviolet LED teebkev siv nyob rau hauv horticulture, tsom rau cov xwm txheej loj hlob uas lub hnub ci yog txwv los yog tsis muaj txhua. Kev siv cov teeb pom kev zoo UV wavelengths muab lub zog txuag hluav taws xob thiab tsim teeb pom kev zoo piv nrog rau lwm cov kev xaiv uas twb muaj lawm hauv khw. Kev siv ultraviolet LEDs tso cai rau qhov chaw loj hlob los simulate nruab hnub zoo dua thiab ua kom cov sij hawm loj hlob. Qhov no siv tau rau ib puag ncig ob qho tib si nrog thiab tsis muaj hnub ci.
UV-A yog lub wavelength uas feem ntau pom nyob rau hauv lub hnub ci lim / tag nrho spectrum. Txhawm rau kom muaj qhov no suav nrog hauv koj cov spectrum yuav txhawb nqa cov nroj tsuag kev ua haujlwm hauv photosynthesis. Qhov no yog ua los ntawm kev tsom mus rau Chlorophyll A thiab B seem ntawm cov nroj tsuag uas absorbs qhov loj tshaj plaws ntawm lub teeb los ntawm nyob rau hauv lub 400nm - 460nm ntau yam. Thaum siv ua ke nrog deb liab wavelengths (720 - 740 nm), qhov no yuav ua rau muaj txiaj ntsig zoo rau kev nqus lub teeb uas xav tau rau photosynthesis.
Qhov txiaj ntsig thib ob ntawm kev siv UV-A hauv cov nroj tsuag kev loj hlob cuam tshuam rau qhov sib txawv ntawm qhov muv pom lub teeb piv rau tib neeg lub qhov muag (qhov no yog cov ncauj lus kom ntxaws ntau dua hauv qab). Kev siv UV-A txhim kho kev loj hlob thiab ua kom yooj yim rau cov muv kom pollinate cov nroj tsuag.
Txij li UV-C thiab, tsis tshua muaj, UV-B muaj ntau txaus los rhuav tshem tag nrho cov kab mob, lawv tau siv los tua cov kab mob thiab dej. Tej zaum nws yuav siv tau cov kab hluav taws xob siab no los rhuav tshem cov kab mob uas muaj nyob rau ntawm nplooj nplooj. Kab kuj tseem siv ultraviolet coj lawv mus rau paj. Pollinators yuav muaj teeb meem nrhiav paj hauv tsev cog khoom yog tias sab hauv tsis muaj ultraviolet lub teeb.
Vim li cas cov nroj tsuag xav tau lub teeb ultraviolet?
Kev loj hlob ntawm cov nroj tsuag zoo heev nyob ntawm lub teeb ultraviolet. UV lub teeb, thaum siv nyob rau hauv nruab nrab, pab nyob rau hauv zus tau tej cov tseem ceeb cov nroj tsuag roj los ntawm cov qoob loo thiab cov nroj tsuag, uas tsis tsuas yog txhim kho cov tsw thiab aroma ntawm txiv hmab txiv ntoo, tab sis kuj pab raws li cov nroj tsuag 'natural sunscreen, shielding lawv los ntawm ntau dhau UV hluav taws xob.
Qhov kev tiv thaiv zoo li no tau lees paub qhov zoo tshaj plaws kev loj hlob thiab tiv thaiv cov nroj tsuag sab hauv kev ua haujlwm. Nyob rau hauv no hais txog, cov nroj tsuag yog incredibly astute vim hais tias lawv yuav tsuas nqus tus nqi npaum li cas ntawm UV teeb yuav tsum tau rau qhov no self-defence mechanism mus qhib.
Lub ultraviolet yog lom lom thiab tswj kev loj hlob ntawm cov nroj tsuag, txawm tias nws nyob sab nraum cov photosynthetically nquag waveband (PAR, lossis tag nrho lub zog xav tau los ntawm cov nroj tsuag, uas yog 400-700 nm).
Tsis tas li ntawd, cov kev tshawb fawb tau qhia tias cov nroj tsuag raug UV teeb yuav muaj pollinated ntau dua, muaj pests tsawg noj rau lawv, thiab tsim ntau dua.
Horticultural LED cog teeb uas suav nrog UV-C yuav tso cai rau cov nroj tsuag kom loj hlob. Koj yuav tsum tau ceev faj heev thaum siv UV-C, txawm li cas los xij, raws li qhov ntau ntawm nws tuaj yeem ua rau cov nroj tsuag loj hlob. Nws raug nquahu kom siv tshuaj tsis pub ntau tshaj 15 feeb hauv ib lub lis piam. Rau kev loj hlob ntawm tag nrho cov nroj tsuag, nrog rau cov ntoo, qhov no yog qhia.
UV tshuaj tua kab mob yog dab tsi?
Yooj yim hais, UV tshuaj tua kab mob yog qhov ua ntawm kev tshem tawm cov kab mob ntawm qhov chaw, dej, thiab huab cua los ntawm kev siv hluav taws xob UV ntawm ib lub wavelength tshwj xeeb. Txhawm rau xa cov huab cua huv thiab qhov chaw nyob rau hauv txhua qhov chaw lag luam, chav tsev tshuaj tua kab mob UV tam sim no tuaj yeem pom muaj ntau qhov ntau thiab tsawg, cov qauv, thiab cov qauv tsim.
Cov tshuaj tua kab mob ultraviolet ua haujlwm li cas?
Los ntawm nrawm thiab ua tau zoo rhuav tshem DNA thiab RNA hauv kev kis kab mob, kev tua kab mob ultraviolet tiv thaiv lawv los ntawm kev tsim tawm thiab, yog li, los ntawm kev kis kab mob. Los ntawm kev tshem tawm ntau yam kev pheej hmoo ntawm kev noj qab haus huv, xws li kev kis mob hauv tsev kho mob, cov kab mob tuag taus zoo li Ebola, SARS, MERS, thiab COVID, kev ua kom tsis muaj menyuam tiv thaiv cov neeg ua haujlwm thiab cov neeg siv khoom ntawm cov chaw tsim khoom uas cuam tshuam nrog pej xeem.
Nws yuav tsum tuaj raws li tsis muaj surprise tias tsev kho mob tau sivLED UV teebtshuaj tua kab mob rau ntau xyoo los ntxuav cov chaw uas peb tau txais kev kho mob thiab rov kho dua.
Puas yog UV LED teeb teeb meem rau tib neeg lub cev?
Tej zaum koj yuav xav tsis thoob yog tias UV teeb muaj kev nyab xeeb vim tias lawv nquag piav qhia hauv xov xwm thiab xov xwm raws li qhov txaus ntshai. Cov lus teb ceev yog tias, tsuav koj mus los ntawm ob peb qhov kev nkag siab zoo, lawv feem ntau muaj kev nyab xeeb.
Tab sis ua ntej, nws yog ib qho tseem ceeb kom nkag siab txog qhov txaus ntshai ntawm UV teeb thiab lawv cuam tshuam li cas rau ib leeg. Lub wavelength thiab lub zog ntawm UV teeb kuj cuam tshuam rau nws cov kev phom sij thiab kev phom sij.
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