Video: Tub ceev xwm siv chromatography li cas?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Hauv forensics, tub ceev xwm siv chromatography txhawm rau txheeb xyuas thiab txheeb xyuas cov khoom pom ntawm qhov chaw ua txhaum cai. Txhua qhov sib tov yog tsim los ntawm cov molecules ntawm cov tshuaj sib txawv, hauv ntau qhov sib txawv. Chromatography ua haujlwm los ntawm kev sib cais cov tshuaj tawm ntawm qhov sib tov thiab kawm seb cov molecules coj li cas thaum lub sijhawm sib cais.
Ntawm no, tub ceev xwm siv chromatography li cas los daws cov teeb meem txhaum cai?
Keeb kwm: Chromatography yog ib txoj hauv kev los tshuaj xyuas cov khoom sib tov los ntawm kev sib cais rau hauv cov tshuaj uas lawv tau tsim. Cov kws tshawb fawb forensic muaj peev xwm siv tus cwj mem chromatography daws teeb meem txhaum cai los ntawm kev sib piv cov ntaub ntawv los yog stains pom ntawm a kev ua txhaum scene rau tus cim lossis cwj mem uas yog tus neeg raug liam.
Tom qab, lo lus nug yog, dab tsi yog txheej txheem ntawm chromatography? Chromatography Qhov tseeb yog ib txoj hauv kev ntawm kev sib cais tawm ntawm cov tshuaj sib tov, uas yog nyob rau hauv cov roj los yog kua daim ntawv, los ntawm kev cia lawv nkag mus maj mam dhau los ntawm lwm yam khoom, uas feem ntau yog kua los yog khoom. Raws li lub sij hawm mobile txav, nws cais tawm mus rau hauv nws cov khoom nyob rau theem nyob ruaj khov.
Kuj nug, chromatography siv nyob rau hauv forensics li cas?
Roj Chromatography yog siv nyob rau hauv tshav dav hlau mus ntes foob pob thiab yog siv yog forensics nyob rau hauv ntau yam sib txawv. Nws yog siv txhawm rau txheeb xyuas cov fibers ntawm tib neeg lub cev thiab tseem txheeb xyuas cov ntshav pom ntawm qhov chaw ua txhaum cai. Hauv gas chromatography helium yog siv kom txav cov roj sib tov los ntawm ib kem ntawm cov khoom siv absorbent.
Dab tsi sib tov tuaj yeem sib cais los ntawm chromatography?
Sib cais yaj yaj - chromatography Nws yog feem ntau siv thaum cov tshuaj yaj yeeb muaj xim, xws li inks, zaub mov xim thiab cov xim cog. Nws ua haujlwm vim tias qee cov xim muaj xim yaj hauv cov kuab tshuaj siv tau zoo dua li lwm tus, yog li lawv mus ntxiv rau hauv daim ntawv.
Pom zoo:
TOC yog dab tsi hauv tub ceev xwm?
Tsis tas li ntawd, kuv pom tias TOC yog 'kev thauj mus los ntawm lub thawv qhib' thiab qhov kev rau txim rau ob qho tib si! Tus Lwm Thawj Coj Tus Thawj Coj (In Process) Tus Lwm Thawj Tub Ceev Xwm / KS Lub Xeev Tub Rog (Tom qab raug kaw) 'Tub ceev xwm ntes ob tug menyuam nag hmo, ib tus haus roj teeb kua qaub, lwm tus tau noj foob pob hluav taws
Nyias txheej chromatography txawv ntawm daim ntawv chromatography li cas?
Qhov sib txawv ntawm cov txheej nyias nyias chromatography (TLC) thiab ntawv chromatography (PC) yog tias, thaum lub sij hawm nyob ruaj ruaj hauv PC yog ntawv, cov theem nyob ruaj khov hauv TLC yog txheej nyias ntawm cov khoom siv tsis zoo uas txhawb nqa ntawm lub tiaj tus, tsis muaj zog
Puas muaj peev xwm hluav taws xob thiab lub zog muaj peev xwm tib yam Vim li cas lossis vim li cas ho tsis?
Lub zog muaj peev xwm hluav taws xob Ue yog lub zog muaj peev xwm khaws cia thaum cov nqi tawm ntawm qhov sib npaug (xws li lub zog muaj peev xwm gravitational). Lub peev xwm hluav taws xob zoo ib yam, tab sis ib tus nqi, Ueq. Ib qho hluav taws xob muaj peev xwm sib txawv ntawm ob lub ntsiab lus hu ua voltage, V = Ue2q−Ue1q
Thaum twg DNA pib siv los ntawm tub ceev xwm?
Xyoo 1986 yog thaum DNA tau siv thawj zaug hauv kev tshawb nrhiav kev ua phem los ntawm Dr. Jeffreys. 1986. Kev tshawb nrhiav tau siv cov ntiv tes ntiv tes rau hauv ib rooj plaub ntawm ob qhov kev ua phem thiab tua neeg uas tau tshwm sim hauv xyoo 1983 thiab 1986
Dab tsi yog qhov txawv ntawm instantaneous thiab nruab nrab ceev dab tsi yog qhov piv txwv loj tshaj ntawm kev ceev ceev?
Qhov nruab nrab ceev yog qhov ceev nruab nrab ntawm lub sijhawm. Instantaneous ceev yuav yog qhov ceev txhua qhov muab tam sim ntawd hauv lub sijhawm ntawd, ntsuas nrog lub ntsuas ntsuas lub sijhawm