Cov txiaj ntsig ntawm kev xa hluav taws xob microscopy
Qhov zoo ntawm Transmission Electron Microscopy
Scanning kis electron microscopy tau tsim nyob rau xyoo 1950. Hloov ntawm lub teeb, TEM siv lub teeb tsom ntawm cov hluav taws xob, uas tau xa los ntawm cov qauv los tsim cov duab. Qhov kom zoo dua ntawm kev xa hluav taws xob microscopy hla lub teeb microscopy yog tias nws muaj peev xwm tsim kom muaj kev nthuav dav ntau dua uas optical microscopes tsis tuaj yeem nthuav tawm cov ntsiab lus.
Lub Microscope ua haujlwm li cas
Transmission electron microscopes ua haujlwm zoo ib yam li lub teeb microscopes, tab sis tsis yog lub teeb lossis photons, lawv siv cov kab hluav taws xob. Ib rab phom hluav taws xob zoo li lub teeb ci hauv lub tshuab hluav taws xob kho qhov muag, qhov chaw ntawm cov hluav taws xob thiab kev ua haujlwm. Tsis zoo them electrons yog attracted rau lub anode, thiab lub nplhaib nqa ib tug zoo nqi. Lub lens hlau nplaum tsom cov kwj ntawm electrons thaum lawv taug kev los ntawm lub tshuab nqus tsev hauv lub tshuab tsom. Cov tsom electrons no ntaus cov qauv ntawm cov theem thiab thaws tawm ntawm cov qauv, tsim x-rays hauv cov txheej txheem. Cov xa rov qab, lossis tawg, cov hluav taws xob, nrog rau X-rays, tau hloov mus rau hauv lub teeb liab uas pub cov duab rau hauv lub vijtsam TV rau cov kws tshawb fawb pom ntawm cov qauv.
Qhov zoo ntawm Transmission Electron Microscopy
Cov qauv ntawm nyias ntu rau optical microscopy thiab kis tau tus mob electron microscopy. Interestingly, nws nthuav cov qauv mus rau qib siab dua li lub teeb microscope. Kev nthuav dav ntawm 10, 000 zaug lossis ntau dua yog ua tau, tso cai rau cov kws tshawb fawb pom cov qauv me me. Rau cov kws kho tsiaj, cov kev ua haujlwm sab hauv ntawm cov hlwb, xws li mitochondria thiab organelles, pom meej meej. Cov qauv siv lead ua ntawm TEM cov qauv muab kev daws teeb meem zoo heev thiab tuaj yeem nthuav tawm qhov kev npaj ntawm atoms hauv cov qauv.
Kev txwv ntawm Kev Sib Txuas Hluav Taws Xob Microscopy
Kev xa tawm electron microscopy xav kom cov qauv mus rau hauv lub tshuab nqus tsev. Vim yog qhov yuav tsum tau ua, lub tshuab tsom iav tuaj yeem siv los soj ntsuam cov qauv nyob, xws li protozoa. Qee cov qauv me me kuj tseem tuaj yeem raug puas los ntawm cov kab hluav taws xob thiab yuav tsum tau ua ntej ua cov tshuaj pleev xim los yog coated los tiv thaiv lawv. Qhov kev kho no qee zaum ua rau cov qauv ua kom puas.
Ordinary microscopes siv lub teeb tsom kom nthuav dav cov duab, tab sis lawv muaj qhov txwv lub cev ntawm thaj tsam li 1000x magnification. Qhov kev txwv no tau mus txog xyoo 1930, tab sis cov kws tshawb fawb vam tias yuav ua kom lawv lub peev xwm nthuav dav, tso cai rau lawv los soj ntsuam cov haujlwm sab hauv ntawm cov hlwb thiab lwm cov qauv hauv microscopic.
