Kub taw tes ntawm 5900 degrees Celsius thiab pob zeb diamond zoo li hardness ua ke nrog carbon:tungstenyog cov hlau hnyav tshaj plaws, tseem muaj kev ua haujlwm lom neeg - tshwj xeeb tshaj yog nyob rau hauv cov kab mob uas muaj cua sov. Ib pab neeg coj los ntawm Tetyana Milojevic los ntawm Kws Qhia Ntawv ntawm Chemistry ntawm University of Vienna qhia thawj zaug uas tsis tshua muaj microbial-tungstenkev sib cuam tshuam ntawm nanometer ntau yam. Raws li cov kev tshawb pom no, tsis yog xwbtungstenbiogeochemistry, tab sis kuj tseem muaj sia nyob ntawm cov kab mob hauv cov chaw sab nrauv tuaj yeem tshawb xyuas. Cov txiaj ntsig tau tshwm sim tsis ntev los no hauv phau ntawv xov xwmFrontiers hauv Microbiology.

Raws li ib qho nyuaj thiab tsis tshua muaj hlau,tungsten, nrog nws cov khoom txawv tshaj plaw thiab qhov siab tshaj plaws melting point ntawm tag nrho cov hlau, yog ib qho kev xaiv tsis zoo rau cov kab mob lom. Tsuas yog ob peb kab mob, xws li thermophilic archaea lossis cell nucleus-free microorganisms, tau yoog rau qhov xwm txheej huab cua ntawm ib puag ncig tungsten thiab nrhiav tau ib txoj hauv kev kom assimilate.tungsten. Ob qhov kev tshawb fawb tsis ntev los no los ntawm biochemist thiab astrobiologist Tetyana Milojevic los ntawm Department of Biophysical Chemistry, Kws Qhia Ntawv ntawm Chemistry ntawm University of Vienna, pom lub luag haujlwm ntawm cov kab mob hauv lub cev.tungsten-enriched ib puag ncig thiab piav qhia txog nanoscaletungsten-microbial interface ntawm huab cua kub- thiab acid-hlub microorganism Metallosphaera sedula zus nrogtungstenkev sib txuas (Daim duab 1, 2). Nws tseem yog cov kab mob no uas yuav raug sim rau kev muaj sia nyob thaum lub sijhawm mus ncig ntawm lub hnub qub hauv kev tshawb fawb yav tom ntej hauv thaj chaw sab nrauv.Tungstentuaj yeem yog qhov tseem ceeb ntawm qhov no.

Los ntawmtungstenpolyoxometalates ua lub neej-sustaining inorganic moj khaum rau microbial bioprocessing ntawmtungsten ore

Zoo ib yam li ferrous sulfide ntxhia hlwb, cov khoom siv dag zog polyoxometalates (POMs) raug suav hais tias yog cov hlwb inorganic hauv kev txhawb nqa cov txheej txheem tshuaj lom neeg ua ntej thiab nthuav tawm "zoo li lub neej". Txawm li cas los xij, qhov cuam tshuam ntawm POMs rau cov txheej txheem ua neej nyob (xws li microbial respiration) tseem tsis tau hais txog. "Siv tus piv txwv ntawm Metallosphaera sedula, uas loj hlob hauv cov kua qaub kub thiab ua pa los ntawm cov hlau oxidation, peb tau tshawb xyuas seb puas muaj cov txheej txheem inorganic nyuaj raws li tungsten POM pawg tuaj yeem txhawb nqa kev loj hlob ntawm M. sedula thiab tsim cov cellular proliferation thiab faib, "hais tias Milojevic.

Cov kws tshawb fawb muaj peev xwm qhia tau tias kev sivtungsten-based inorganic POM pawg ua kom muaj kev sib koom ua ke ntawm heterogeneoustungstenredox hom nyob rau hauv microbial hlwb. Cov organometallic deposits ntawm lub interface ntawm M. sedula thiab W-POM tau yaj mus rau lub nanometer ntau yam thaum lub sij hawm fruitful kev koom tes nrog lub Austrian Center rau Electron Microscopy thiab Nanoanalysis (FELMI-ZFE, Graz). Peb qhov kev tshawb pom ntxiv tungsten-encrusted M. sedula rau cov ntaub ntawv loj hlob ntawm biomineralized microbial hom, ntawm cov archaea tsis tshua muaj sawv cev, "said Milojevic. Biotransformation ntawmtungsten ntxhiascheelite ua los ntawm huab cua thermoacidophile M. sedula ua rau kev tawg ntawm scheelite qauv, tom qab solubilization ntawmtungsten, thiabtungstenmineralization ntawm microbial cell nto (Daim duab 3). Cov biogenictungsten carbide-zoo li nanostructures piav nyob rau hauv txoj kev tshawb no sawv cev rau lub peev xwm sustainable nanomaterial tau los ntawm ib puag ncig tus phooj ywg microbial-pab tsim.

"Peb cov txiaj ntsig qhia tias M. sedula daim ntawvtungsten- bearing mineralized cell nto ntawm encrusting nrogtungsten carbide zoo licov tebchaw,” piav qhia biochemist Milojevic. Qhov notungsten-encrusted txheej tsim nyob ib ncig ntawm lub hlwb ntawm M. sedula yuav zoo heev sawv cev rau ib tug microbial lub tswv yim los tiv thaiv ib puag ncig hnyav, xws li thaum lub sij hawm interplanetary taug kev.Tungstenencapsulation tuaj yeem ua cov khoom siv hluav taws xob muaj zog tiv thaiv ib puag ncig hnyav. "Cov kab mob microbial tungsten tso cai rau peb los kawm ntxiv txog kev muaj sia nyob ntawm cov kab mob no hauv ib puag ncig sab nraud," Milojevic xaus lus.