Qhov kub ntawm 5900 degrees Celsius thiab pob zeb diamond zoo li hardness ua ke nrog cov pa roj carbon: tungsten yog cov hlau hnyav tshaj plaws, tseem muaj cov khoom siv roj ntsha-tshwj xeeb tshaj yog 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 tsis tshua muaj microbial-tungsten kev sib cuam tshuam ntawm nanometer ntau yam. Raws li cov kev tshawb pom no, tsis yog tsuas yog tungsten biogeochemistry, 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 xwm Frontiers hauv Microbiology.

Raws li ib qho nyuaj thiab tsis tshua muaj hlau, tungsten, nrog nws cov khoom txawv tshaj plaw thiab 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 mus rau qhov xwm txheej huab cua ntawm ib puag ncig tungsten thiab nrhiav tau ib txoj hauv kev los 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, tso lub teeb rau lub luag haujlwm ntawm cov kab mob nyob hauv ib puag ncig tungsten-enriched thiab piav qhia txog nanoscale tungsten-microbial interface ntawm huab. Thaum tshav kub kub- thiab acid-hlub microorganism Metallosphaera sedula zus nrog tungsten 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. Tungsten tuaj yeem yog qhov tseem ceeb hauv qhov no.

Los ntawm tungsten polyoxometalates ua lub neej-sustaining inorganic moj khaum rau microbial bioprocessing ntawm tungsten ores

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 tau pom tau tias kev siv tungsten-based inorganic POM pawg ua rau muaj kev sib koom ua ke ntawm heterogeneous tungsten redox hom rau hauv cov kab mob microbial. 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. Lub biotransformation ntawm tungsten ntxhia scheelite ua los ntawm huab thermoacidophile M. sedula ua rau kev tawg ntawm scheelite qauv, tom qab solubilization ntawm tungsten, thiab tungsten mineralization ntawm microbial cell nto (Daim duab 3). Cov biogenic tungsten carbide zoo li nanostructures piav nyob rau hauv txoj kev tshawb no sawv cev rau ib tug muaj peev xwm sustainable nanomaterial tau los ntawm ib puag ncig tus phooj ywg microbial-pab tsim.